Reset

config/endpoint/common.go

@@ -0,0 +1,32 @@
+package endpoint
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+)
+
+var (
+	// ErrEndpointWithNoName is the error with which Gatus will panic if an endpoint is configured with no name
+	ErrEndpointWithNoName = errors.New("you must specify a name for each endpoint")
+
+	// ErrEndpointWithInvalidNameOrGroup is the error with which Gatus will panic if an endpoint has an invalid character where it shouldn't
+	ErrEndpointWithInvalidNameOrGroup = errors.New("endpoint name and group must not have \" or \\")
+)
+
+// validateEndpointNameGroupAndAlerts validates the name, group and alerts of an endpoint
+func validateEndpointNameGroupAndAlerts(name, group string, alerts []*alert.Alert) error {
+	if len(name) == 0 {
+		return ErrEndpointWithNoName
+	}
+	if strings.ContainsAny(name, "\"\\") || strings.ContainsAny(group, "\"\\") {
+		return ErrEndpointWithInvalidNameOrGroup
+	}
+	for _, endpointAlert := range alerts {
+		if err := endpointAlert.ValidateAndSetDefaults(); err != nil {
+			return err
+		}
+	}
+	return nil
+}

config/endpoint/common_test.go

@@ -0,0 +1,51 @@
+package endpoint
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+)
+
+func TestValidateEndpointNameGroupAndAlerts(t *testing.T) {
+	scenarios := []struct {
+		name        string
+		group       string
+		alerts      []*alert.Alert
+		expectedErr error
+	}{
+		{
+			name:   "n",
+			group:  "g",
+			alerts: []*alert.Alert{{Type: "slack"}},
+		},
+		{
+			name:   "n",
+			alerts: []*alert.Alert{{Type: "slack"}},
+		},
+		{
+			group:       "g",
+			alerts:      []*alert.Alert{{Type: "slack"}},
+			expectedErr: ErrEndpointWithNoName,
+		},
+		{
+			name:        "\"",
+			alerts:      []*alert.Alert{{Type: "slack"}},
+			expectedErr: ErrEndpointWithInvalidNameOrGroup,
+		},
+		{
+			name:        "n",
+			group:       "\\",
+			alerts:      []*alert.Alert{{Type: "slack"}},
+			expectedErr: ErrEndpointWithInvalidNameOrGroup,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := validateEndpointNameGroupAndAlerts(scenario.name, scenario.group, scenario.alerts)
+			if !errors.Is(err, scenario.expectedErr) {
+				t.Errorf("expected error to be %v but got %v", scenario.expectedErr, err)
+			}
+		})
+	}
+}

config/endpoint/condition.go

@@ -0,0 +1,364 @@
+package endpoint
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/TwiN/gatus/v5/jsonpath"
+	"github.com/TwiN/gatus/v5/pattern"
+)
+
+// Placeholders
+const (
+	// StatusPlaceholder is a placeholder for a HTTP status.
+	//
+	// Values that could replace the placeholder: 200, 404, 500, ...
+	StatusPlaceholder = "[STATUS]"
+
+	// IPPlaceholder is a placeholder for an IP.
+	//
+	// Values that could replace the placeholder: 127.0.0.1, 10.0.0.1, ...
+	IPPlaceholder = "[IP]"
+
+	// DNSRCodePlaceholder is a placeholder for DNS_RCODE
+	//
+	// Values that could replace the placeholder: NOERROR, FORMERR, SERVFAIL, NXDOMAIN, NOTIMP, REFUSED
+	DNSRCodePlaceholder = "[DNS_RCODE]"
+
+	// ResponseTimePlaceholder is a placeholder for the request response time, in milliseconds.
+	//
+	// Values that could replace the placeholder: 1, 500, 1000, ...
+	ResponseTimePlaceholder = "[RESPONSE_TIME]"
+
+	// BodyPlaceholder is a placeholder for the Body of the response
+	//
+	// Values that could replace the placeholder: {}, {"data":{"name":"john"}}, ...
+	BodyPlaceholder = "[BODY]"
+
+	// ConnectedPlaceholder is a placeholder for whether a connection was successfully established.
+	//
+	// Values that could replace the placeholder: true, false
+	ConnectedPlaceholder = "[CONNECTED]"
+
+	// CertificateExpirationPlaceholder is a placeholder for the duration before certificate expiration, in milliseconds.
+	//
+	// Values that could replace the placeholder: 4461677039 (~52 days)
+	CertificateExpirationPlaceholder = "[CERTIFICATE_EXPIRATION]"
+
+	// DomainExpirationPlaceholder is a placeholder for the duration before the domain expires, in milliseconds.
+	DomainExpirationPlaceholder = "[DOMAIN_EXPIRATION]"
+)
+
+// Functions
+const (
+	// LengthFunctionPrefix is the prefix for the length function
+	//
+	// Usage: len([BODY].articles) == 10, len([BODY].name) > 5
+	LengthFunctionPrefix = "len("
+
+	// HasFunctionPrefix is the prefix for the has function
+	//
+	// Usage: has([BODY].errors) == true
+	HasFunctionPrefix = "has("
+
+	// PatternFunctionPrefix is the prefix for the pattern function
+	//
+	// Usage: [IP] == pat(192.168.*.*)
+	PatternFunctionPrefix = "pat("
+
+	// AnyFunctionPrefix is the prefix for the any function
+	//
+	// Usage: [IP] == any(1.1.1.1, 1.0.0.1)
+	AnyFunctionPrefix = "any("
+
+	// FunctionSuffix is the suffix for all functions
+	FunctionSuffix = ")"
+)
+
+// Other constants
+const (
+	// InvalidConditionElementSuffix is the suffix that will be appended to an invalid condition
+	InvalidConditionElementSuffix = "(INVALID)"
+
+	// maximumLengthBeforeTruncatingWhenComparedWithPattern is the maximum length an element being compared to a
+	// pattern can have.
+	//
+	// This is only used for aesthetic purposes; it does not influence whether the condition evaluation results in a
+	// success or a failure
+	maximumLengthBeforeTruncatingWhenComparedWithPattern = 25
+)
+
+// Condition is a condition that needs to be met in order for an Endpoint to be considered healthy.
+type Condition string
+
+// Validate checks if the Condition is valid
+func (c Condition) Validate() error {
+	r := &Result{}
+	c.evaluate(r, false)
+	if len(r.Errors) != 0 {
+		return errors.New(r.Errors[0])
+	}
+	return nil
+}
+
+// evaluate the Condition with the Result of the health check
+func (c Condition) evaluate(result *Result, dontResolveFailedConditions bool) bool {
+	condition := string(c)
+	success := false
+	conditionToDisplay := condition
+	if strings.Contains(condition, " == ") {
+		parameters, resolvedParameters := sanitizeAndResolve(strings.Split(condition, " == "), result)
+		success = isEqual(resolvedParameters[0], resolvedParameters[1])
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettify(parameters, resolvedParameters, "==")
+		}
+	} else if strings.Contains(condition, " != ") {
+		parameters, resolvedParameters := sanitizeAndResolve(strings.Split(condition, " != "), result)
+		success = !isEqual(resolvedParameters[0], resolvedParameters[1])
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettify(parameters, resolvedParameters, "!=")
+		}
+	} else if strings.Contains(condition, " <= ") {
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, " <= "), result)
+		success = resolvedParameters[0] <= resolvedParameters[1]
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, "<=")
+		}
+	} else if strings.Contains(condition, " >= ") {
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, " >= "), result)
+		success = resolvedParameters[0] >= resolvedParameters[1]
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, ">=")
+		}
+	} else if strings.Contains(condition, " > ") {
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, " > "), result)
+		success = resolvedParameters[0] > resolvedParameters[1]
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, ">")
+		}
+	} else if strings.Contains(condition, " < ") {
+		parameters, resolvedParameters := sanitizeAndResolveNumerical(strings.Split(condition, " < "), result)
+		success = resolvedParameters[0] < resolvedParameters[1]
+		if !success && !dontResolveFailedConditions {
+			conditionToDisplay = prettifyNumericalParameters(parameters, resolvedParameters, "<")
+		}
+	} else {
+		result.AddError(fmt.Sprintf("invalid condition: %s", condition))
+		return false
+	}
+	if !success {
+		//logr.Debugf("[Condition.evaluate] Condition '%s' did not succeed because '%s' is false", condition, condition)
+	}
+	result.ConditionResults = append(result.ConditionResults, &ConditionResult{Condition: conditionToDisplay, Success: success})
+	return success
+}
+
+// hasBodyPlaceholder checks whether the condition has a BodyPlaceholder
+// Used for determining whether the response body should be read or not
+func (c Condition) hasBodyPlaceholder() bool {
+	return strings.Contains(string(c), BodyPlaceholder)
+}
+
+// hasDomainExpirationPlaceholder checks whether the condition has a DomainExpirationPlaceholder
+// Used for determining whether a whois operation is necessary
+func (c Condition) hasDomainExpirationPlaceholder() bool {
+	return strings.Contains(string(c), DomainExpirationPlaceholder)
+}
+
+// hasIPPlaceholder checks whether the condition has an IPPlaceholder
+// Used for determining whether an IP lookup is necessary
+func (c Condition) hasIPPlaceholder() bool {
+	return strings.Contains(string(c), IPPlaceholder)
+}
+
+// isEqual compares two strings.
+//
+// Supports the "pat" and the "any" functions.
+// i.e. if one of the parameters starts with PatternFunctionPrefix and ends with FunctionSuffix, it will be treated like
+// a pattern.
+func isEqual(first, second string) bool {
+	firstHasFunctionSuffix := strings.HasSuffix(first, FunctionSuffix)
+	secondHasFunctionSuffix := strings.HasSuffix(second, FunctionSuffix)
+	if firstHasFunctionSuffix || secondHasFunctionSuffix {
+		var isFirstPattern, isSecondPattern bool
+		if strings.HasPrefix(first, PatternFunctionPrefix) && firstHasFunctionSuffix {
+			isFirstPattern = true
+			first = strings.TrimSuffix(strings.TrimPrefix(first, PatternFunctionPrefix), FunctionSuffix)
+		}
+		if strings.HasPrefix(second, PatternFunctionPrefix) && secondHasFunctionSuffix {
+			isSecondPattern = true
+			second = strings.TrimSuffix(strings.TrimPrefix(second, PatternFunctionPrefix), FunctionSuffix)
+		}
+		if isFirstPattern && !isSecondPattern {
+			return pattern.Match(first, second)
+		} else if !isFirstPattern && isSecondPattern {
+			return pattern.Match(second, first)
+		}
+		var isFirstAny, isSecondAny bool
+		if strings.HasPrefix(first, AnyFunctionPrefix) && firstHasFunctionSuffix {
+			isFirstAny = true
+			first = strings.TrimSuffix(strings.TrimPrefix(first, AnyFunctionPrefix), FunctionSuffix)
+		}
+		if strings.HasPrefix(second, AnyFunctionPrefix) && secondHasFunctionSuffix {
+			isSecondAny = true
+			second = strings.TrimSuffix(strings.TrimPrefix(second, AnyFunctionPrefix), FunctionSuffix)
+		}
+		if isFirstAny && !isSecondAny {
+			options := strings.Split(first, ",")
+			for _, option := range options {
+				if strings.TrimSpace(option) == second {
+					return true
+				}
+			}
+			return false
+		} else if !isFirstAny && isSecondAny {
+			options := strings.Split(second, ",")
+			for _, option := range options {
+				if strings.TrimSpace(option) == first {
+					return true
+				}
+			}
+			return false
+		}
+	}
+
+	// test if inputs are integers
+	firstInt, err1 := strconv.ParseInt(first, 0, 64)
+	secondInt, err2 := strconv.ParseInt(second, 0, 64)
+	if err1 == nil && err2 == nil {
+		return firstInt == secondInt
+	}
+
+	return first == second
+}
+
+// sanitizeAndResolve sanitizes and resolves a list of elements and returns the list of parameters as well as a list
+// of resolved parameters
+func sanitizeAndResolve(elements []string, result *Result) ([]string, []string) {
+	parameters := make([]string, len(elements))
+	resolvedParameters := make([]string, len(elements))
+	body := strings.TrimSpace(string(result.Body))
+	for i, element := range elements {
+		element = strings.TrimSpace(element)
+		parameters[i] = element
+		switch strings.ToUpper(element) {
+		case StatusPlaceholder:
+			element = strconv.Itoa(result.HTTPStatus)
+		case IPPlaceholder:
+			element = result.IP
+		case ResponseTimePlaceholder:
+			element = strconv.Itoa(int(result.Duration.Milliseconds()))
+		case BodyPlaceholder:
+			element = body
+		case DNSRCodePlaceholder:
+			element = result.DNSRCode
+		case ConnectedPlaceholder:
+			element = strconv.FormatBool(result.Connected)
+		case CertificateExpirationPlaceholder:
+			element = strconv.FormatInt(result.CertificateExpiration.Milliseconds(), 10)
+		case DomainExpirationPlaceholder:
+			element = strconv.FormatInt(result.DomainExpiration.Milliseconds(), 10)
+		default:
+			// if contains the BodyPlaceholder, then evaluate json path
+			if strings.Contains(element, BodyPlaceholder) {
+				checkingForLength := false
+				checkingForExistence := false
+				if strings.HasPrefix(element, LengthFunctionPrefix) && strings.HasSuffix(element, FunctionSuffix) {
+					checkingForLength = true
+					element = strings.TrimSuffix(strings.TrimPrefix(element, LengthFunctionPrefix), FunctionSuffix)
+				}
+				if strings.HasPrefix(element, HasFunctionPrefix) && strings.HasSuffix(element, FunctionSuffix) {
+					checkingForExistence = true
+					element = strings.TrimSuffix(strings.TrimPrefix(element, HasFunctionPrefix), FunctionSuffix)
+				}
+				resolvedElement, resolvedElementLength, err := jsonpath.Eval(strings.TrimPrefix(strings.TrimPrefix(element, BodyPlaceholder), "."), result.Body)
+				if checkingForExistence {
+					if err != nil {
+						element = "false"
+					} else {
+						element = "true"
+					}
+				} else {
+					if err != nil {
+						if err.Error() != "unexpected end of JSON input" {
+							result.AddError(err.Error())
+						}
+						if checkingForLength {
+							element = LengthFunctionPrefix + element + FunctionSuffix + " " + InvalidConditionElementSuffix
+						} else {
+							element = element + " " + InvalidConditionElementSuffix
+						}
+					} else {
+						if checkingForLength {
+							element = strconv.Itoa(resolvedElementLength)
+						} else {
+							element = resolvedElement
+						}
+					}
+				}
+			}
+		}
+		resolvedParameters[i] = element
+	}
+	return parameters, resolvedParameters
+}
+
+func sanitizeAndResolveNumerical(list []string, result *Result) (parameters []string, resolvedNumericalParameters []int64) {
+	parameters, resolvedParameters := sanitizeAndResolve(list, result)
+	for _, element := range resolvedParameters {
+		if duration, err := time.ParseDuration(element); duration != 0 && err == nil {
+			// If the string is a duration, convert it to milliseconds
+			resolvedNumericalParameters = append(resolvedNumericalParameters, duration.Milliseconds())
+		} else if number, err := strconv.ParseInt(element, 0, 64); err != nil {
+			// It's not an int, so we'll check if it's a float
+			if f, err := strconv.ParseFloat(element, 64); err == nil {
+				// It's a float, but we'll convert it to an int. We're losing precision here, but it's better than
+				// just returning 0.
+				resolvedNumericalParameters = append(resolvedNumericalParameters, int64(f))
+			} else {
+				// Default to 0 if the string couldn't be converted to an integer or a float
+				resolvedNumericalParameters = append(resolvedNumericalParameters, 0)
+			}
+		} else {
+			resolvedNumericalParameters = append(resolvedNumericalParameters, number)
+		}
+	}
+	return parameters, resolvedNumericalParameters
+}
+
+func prettifyNumericalParameters(parameters []string, resolvedParameters []int64, operator string) string {
+	return prettify(parameters, []string{strconv.Itoa(int(resolvedParameters[0])), strconv.Itoa(int(resolvedParameters[1]))}, operator)
+}
+
+// prettify returns a string representation of a condition with its parameters resolved between parentheses
+func prettify(parameters []string, resolvedParameters []string, operator string) string {
+	// Since, in the event of an invalid path, the resolvedParameters also contain the condition itself,
+	// we'll return the resolvedParameters as-is.
+	if strings.HasSuffix(resolvedParameters[0], InvalidConditionElementSuffix) || strings.HasSuffix(resolvedParameters[1], InvalidConditionElementSuffix) {
+		return resolvedParameters[0] + " " + operator + " " + resolvedParameters[1]
+	}
+	// If using the pattern function, truncate the parameter it's being compared to if said parameter is long enough
+	if strings.HasPrefix(parameters[0], PatternFunctionPrefix) && strings.HasSuffix(parameters[0], FunctionSuffix) && len(resolvedParameters[1]) > maximumLengthBeforeTruncatingWhenComparedWithPattern {
+		resolvedParameters[1] = fmt.Sprintf("%.25s...(truncated)", resolvedParameters[1])
+	}
+	if strings.HasPrefix(parameters[1], PatternFunctionPrefix) && strings.HasSuffix(parameters[1], FunctionSuffix) && len(resolvedParameters[0]) > maximumLengthBeforeTruncatingWhenComparedWithPattern {
+		resolvedParameters[0] = fmt.Sprintf("%.25s...(truncated)", resolvedParameters[0])
+	}
+	// First element is a placeholder
+	if parameters[0] != resolvedParameters[0] && parameters[1] == resolvedParameters[1] {
+		return parameters[0] + " (" + resolvedParameters[0] + ") " + operator + " " + parameters[1]
+	}
+	// Second element is a placeholder
+	if parameters[0] == resolvedParameters[0] && parameters[1] != resolvedParameters[1] {
+		return parameters[0] + " " + operator + " " + parameters[1] + " (" + resolvedParameters[1] + ")"
+	}
+	// Both elements are placeholders...?
+	if parameters[0] != resolvedParameters[0] && parameters[1] != resolvedParameters[1] {
+		return parameters[0] + " (" + resolvedParameters[0] + ") " + operator + " " + parameters[1] + " (" + resolvedParameters[1] + ")"
+	}
+	// Neither elements are placeholders
+	return parameters[0] + " " + operator + " " + parameters[1]
+}

config/endpoint/condition_bench_test.go

@@ -0,0 +1,86 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func BenchmarkCondition_evaluateWithBodyStringAny(b *testing.B) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringAnyFailure(b *testing.B) {
+	condition := Condition("[BODY].name == any(john.doe, jane.doe)")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyString(b *testing.B) {
+	condition := Condition("[BODY].name == john.doe")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringFailure(b *testing.B) {
+	condition := Condition("[BODY].name == john.doe")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringFailureInvalidPath(b *testing.B) {
+	condition := Condition("[BODY].user.name == bob.doe")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringLen(b *testing.B) {
+	condition := Condition("len([BODY].name) == 8")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"john.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithBodyStringLenFailure(b *testing.B) {
+	condition := Condition("len([BODY].name) == 8")
+	for n := 0; n < b.N; n++ {
+		result := &Result{Body: []byte("{\"name\": \"bob.doe\"}")}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithStatus(b *testing.B) {
+	condition := Condition("[STATUS] == 200")
+	for n := 0; n < b.N; n++ {
+		result := &Result{HTTPStatus: 200}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkCondition_evaluateWithStatusFailure(b *testing.B) {
+	condition := Condition("[STATUS] == 200")
+	for n := 0; n < b.N; n++ {
+		result := &Result{HTTPStatus: 400}
+		condition.evaluate(result, false)
+	}
+	b.ReportAllocs()
+}

config/endpoint/condition_result.go

@@ -0,0 +1,10 @@
+package endpoint
+
+// ConditionResult result of a Condition
+type ConditionResult struct {
+	// Condition that was evaluated
+	Condition string `json:"condition"`
+
+	// Success whether the condition was met (successful) or not (failed)
+	Success bool `json:"success"`
+}

config/endpoint/condition_test.go

@@ -0,0 +1,779 @@
+package endpoint
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestCondition_Validate(t *testing.T) {
+	scenarios := []struct {
+		condition   Condition
+		expectedErr error
+	}{
+		{condition: "[STATUS] == 200", expectedErr: nil},
+		{condition: "[STATUS] != 200", expectedErr: nil},
+		{condition: "[STATUS] <= 200", expectedErr: nil},
+		{condition: "[STATUS] >= 200", expectedErr: nil},
+		{condition: "[STATUS] < 200", expectedErr: nil},
+		{condition: "[STATUS] > 200", expectedErr: nil},
+		{condition: "[STATUS] == any(200, 201, 202, 203)", expectedErr: nil},
+		{condition: "[STATUS] == [BODY].status", expectedErr: nil},
+		{condition: "[CONNECTED] == true", expectedErr: nil},
+		{condition: "[RESPONSE_TIME] < 500", expectedErr: nil},
+		{condition: "[IP] == 127.0.0.1", expectedErr: nil},
+		{condition: "[BODY] == 1", expectedErr: nil},
+		{condition: "[BODY].test == wat", expectedErr: nil},
+		{condition: "[BODY].test.wat == wat", expectedErr: nil},
+		{condition: "[BODY].age == [BODY].id", expectedErr: nil},
+		{condition: "[BODY].users[0].id == 1", expectedErr: nil},
+		{condition: "len([BODY].users) == 100", expectedErr: nil},
+		{condition: "len([BODY].data) < 5", expectedErr: nil},
+		{condition: "has([BODY].errors) == false", expectedErr: nil},
+		{condition: "has([BODY].users[0].name) == true", expectedErr: nil},
+		{condition: "[BODY].name == pat(john*)", expectedErr: nil},
+		{condition: "[CERTIFICATE_EXPIRATION] > 48h", expectedErr: nil},
+		{condition: "[DOMAIN_EXPIRATION] > 720h", expectedErr: nil},
+		{condition: "raw == raw", expectedErr: nil},
+		{condition: "[STATUS] ? 201", expectedErr: errors.New("invalid condition: [STATUS] ? 201")},
+		{condition: "[STATUS]==201", expectedErr: errors.New("invalid condition: [STATUS]==201")},
+		{condition: "[STATUS] = = 201", expectedErr: errors.New("invalid condition: [STATUS] = = 201")},
+		{condition: "[STATUS] ==", expectedErr: errors.New("invalid condition: [STATUS] ==")},
+		{condition: "[STATUS]", expectedErr: errors.New("invalid condition: [STATUS]")},
+		// FIXME: Should return an error, but doesn't because jsonpath isn't evaluated due to body being empty in Condition.Validate()
+		//{condition: "len([BODY].users == 100", expectedErr: nil},
+	}
+	for _, scenario := range scenarios {
+		t.Run(string(scenario.condition), func(t *testing.T) {
+			if err := scenario.condition.Validate(); fmt.Sprint(err) != fmt.Sprint(scenario.expectedErr) {
+				t.Errorf("expected err %v, got %v", scenario.expectedErr, err)
+			}
+		})
+	}
+}
+
+func TestCondition_evaluate(t *testing.T) {
+	scenarios := []struct {
+		Name                        string
+		Condition                   Condition
+		Result                      *Result
+		DontResolveFailedConditions bool
+		ExpectedSuccess             bool
+		ExpectedOutput              string
+	}{
+		{
+			Name:            "ip",
+			Condition:       Condition("[IP] == 127.0.0.1"),
+			Result:          &Result{IP: "127.0.0.1"},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[IP] == 127.0.0.1",
+		},
+		{
+			Name:            "status",
+			Condition:       Condition("[STATUS] == 200"),
+			Result:          &Result{HTTPStatus: 200},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[STATUS] == 200",
+		},
+		{
+			Name:            "status-failure",
+			Condition:       Condition("[STATUS] == 200"),
+			Result:          &Result{HTTPStatus: 500},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[STATUS] (500) == 200",
+		},
+		{
+			Name:            "status-using-less-than",
+			Condition:       Condition("[STATUS] < 300"),
+			Result:          &Result{HTTPStatus: 201},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[STATUS] < 300",
+		},
+		{
+			Name:            "status-using-less-than-failure",
+			Condition:       Condition("[STATUS] < 300"),
+			Result:          &Result{HTTPStatus: 404},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[STATUS] (404) < 300",
+		},
+		{
+			Name:            "response-time-using-less-than",
+			Condition:       Condition("[RESPONSE_TIME] < 500"),
+			Result:          &Result{Duration: 50 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] < 500",
+		},
+		{
+			Name:            "response-time-using-less-than-with-duration",
+			Condition:       Condition("[RESPONSE_TIME] < 1s"),
+			Result:          &Result{Duration: 50 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] < 1s",
+		},
+		{
+			Name:            "response-time-using-less-than-invalid",
+			Condition:       Condition("[RESPONSE_TIME] < potato"),
+			Result:          &Result{Duration: 50 * time.Millisecond},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[RESPONSE_TIME] (50) < potato (0)", // Non-numerical values automatically resolve to 0
+		},
+		{
+			Name:            "response-time-using-greater-than",
+			Condition:       Condition("[RESPONSE_TIME] > 500"),
+			Result:          &Result{Duration: 750 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] > 500",
+		},
+		{
+			Name:            "response-time-using-greater-than-with-duration",
+			Condition:       Condition("[RESPONSE_TIME] > 1s"),
+			Result:          &Result{Duration: 2 * time.Second},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] > 1s",
+		},
+		{
+			Name:            "response-time-using-greater-than-or-equal-to-equal",
+			Condition:       Condition("[RESPONSE_TIME] >= 500"),
+			Result:          &Result{Duration: 500 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] >= 500",
+		},
+		{
+			Name:            "response-time-using-greater-than-or-equal-to-greater",
+			Condition:       Condition("[RESPONSE_TIME] >= 500"),
+			Result:          &Result{Duration: 499 * time.Millisecond},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[RESPONSE_TIME] (499) >= 500",
+		},
+		{
+			Name:            "response-time-using-greater-than-or-equal-to-failure",
+			Condition:       Condition("[RESPONSE_TIME] >= 500"),
+			Result:          &Result{Duration: 499 * time.Millisecond},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[RESPONSE_TIME] (499) >= 500",
+		},
+		{
+			Name:            "response-time-using-less-than-or-equal-to-equal",
+			Condition:       Condition("[RESPONSE_TIME] <= 500"),
+			Result:          &Result{Duration: 500 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] <= 500",
+		},
+		{
+			Name:            "response-time-using-less-than-or-equal-to-less",
+			Condition:       Condition("[RESPONSE_TIME] <= 500"),
+			Result:          &Result{Duration: 25 * time.Millisecond},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[RESPONSE_TIME] <= 500",
+		},
+		{
+			Name:            "response-time-using-less-than-or-equal-to-failure",
+			Condition:       Condition("[RESPONSE_TIME] <= 500"),
+			Result:          &Result{Duration: 750 * time.Millisecond},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[RESPONSE_TIME] (750) <= 500",
+		},
+		{
+			Name:            "body",
+			Condition:       Condition("[BODY] == test"),
+			Result:          &Result{Body: []byte("test")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] == test",
+		},
+		{
+			Name:            "body-numerical-equal",
+			Condition:       Condition("[BODY] == 123"),
+			Result:          &Result{Body: []byte("123")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] == 123",
+		},
+		{
+			Name:            "body-numerical-less-than",
+			Condition:       Condition("[BODY] < 124"),
+			Result:          &Result{Body: []byte("123")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] < 124",
+		},
+		{
+			Name:            "body-numerical-greater-than",
+			Condition:       Condition("[BODY] > 122"),
+			Result:          &Result{Body: []byte("123")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] > 122",
+		},
+		{
+			Name:            "body-numerical-greater-than-failure",
+			Condition:       Condition("[BODY] > 123"),
+			Result:          &Result{Body: []byte("100")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY] (100) > 123",
+		},
+		{
+			Name:            "body-jsonpath",
+			Condition:       Condition("[BODY].status == UP"),
+			Result:          &Result{Body: []byte("{\"status\":\"UP\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].status == UP",
+		},
+		{
+			Name:            "body-jsonpath-complex",
+			Condition:       Condition("[BODY].data.name == john"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1, \"name\": \"john\"}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data.name == john",
+		},
+		{
+			Name:            "body-jsonpath-complex-invalid",
+			Condition:       Condition("[BODY].data.name == john"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1}}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].data.name (INVALID) == john",
+		},
+		{
+			Name:            "body-jsonpath-complex-len-invalid",
+			Condition:       Condition("len([BODY].data.name) == john"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1}}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "len([BODY].data.name) (INVALID) == john",
+		},
+		{
+			Name:            "body-jsonpath-double-placeholder",
+			Condition:       Condition("[BODY].user.firstName != [BODY].user.lastName"),
+			Result:          &Result{Body: []byte("{\"user\": {\"firstName\": \"john\", \"lastName\": \"doe\"}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].user.firstName != [BODY].user.lastName",
+		},
+		{
+			Name:            "body-jsonpath-double-placeholder-failure",
+			Condition:       Condition("[BODY].user.firstName == [BODY].user.lastName"),
+			Result:          &Result{Body: []byte("{\"user\": {\"firstName\": \"john\", \"lastName\": \"doe\"}}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].user.firstName (john) == [BODY].user.lastName (doe)",
+		},
+		{
+			Name:            "body-jsonpath-when-body-is-array",
+			Condition:       Condition("[BODY][0].id == 1"),
+			Result:          &Result{Body: []byte("[{\"id\": 1}, {\"id\": 2}]")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY][0].id == 1",
+		},
+		{
+			Name:            "body-jsonpath-when-body-has-null-parameter",
+			Condition:       Condition("[BODY].data == OK"),
+			Result:          &Result{Body: []byte(`{"data": null}"`)},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].data (INVALID) == OK",
+		},
+		{
+			Name:            "body-jsonpath-when-body-has-array-with-null",
+			Condition:       Condition("[BODY].items[0] == OK"),
+			Result:          &Result{Body: []byte(`{"items": [null, null]}"`)},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].items[0] (INVALID) == OK",
+		},
+		{
+			Name:            "body-jsonpath-when-body-is-null",
+			Condition:       Condition("[BODY].data == OK"),
+			Result:          &Result{Body: []byte(`null`)},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].data (INVALID) == OK",
+		},
+		{
+			Name:            "body-jsonpath-when-body-is-array-but-actual-body-is-not",
+			Condition:       Condition("[BODY][0].name == test"),
+			Result:          &Result{Body: []byte("{\"statusCode\": 500, \"message\": \"Internal Server Error\"}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY][0].name (INVALID) == test",
+		},
+		{
+			Name:            "body-jsonpath-complex-int",
+			Condition:       Condition("[BODY].data.id == 1"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data.id == 1",
+		},
+		{
+			Name:            "body-jsonpath-complex-array-int",
+			Condition:       Condition("[BODY].data[1].id == 2"),
+			Result:          &Result{Body: []byte("{\"data\": [{\"id\": 1}, {\"id\": 2}, {\"id\": 3}]}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data[1].id == 2",
+		},
+		{
+			Name:            "body-jsonpath-complex-int-using-greater-than",
+			Condition:       Condition("[BODY].data.id > 0"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data.id > 0",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-greater-than",
+			Condition:       Condition("[BODY].data > 0"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data > 0",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-equal-to-0x1",
+			Condition:       Condition("[BODY].data == 1"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 1",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-equals",
+			Condition:       Condition("[BODY].data == 0x1"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 0x1",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-equal-to-0x2",
+			Condition:       Condition("[BODY].data == 2"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x2\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 2",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-equal-to-0xF",
+			Condition:       Condition("[BODY].data == 15"),
+			Result:          &Result{Body: []byte("{\"data\": \"0xF\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 15",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-using-equal-to-0xC0ff33",
+			Condition:       Condition("[BODY].data == 12648243"),
+			Result:          &Result{Body: []byte("{\"data\": \"0xC0ff33\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 12648243",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-len",
+			Condition:       Condition("len([BODY].data) == 3"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].data) == 3",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-greater",
+			Condition:       Condition("[BODY].data >= 1"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x01\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data >= 1",
+		},
+		{
+			Name:            "body-jsonpath-hexadecimal-int-0x01-len",
+			Condition:       Condition("len([BODY].data) == 4"),
+			Result:          &Result{Body: []byte("{\"data\": \"0x01\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].data) == 4",
+		},
+		{
+			Name:            "body-jsonpath-octal-int-using-greater-than",
+			Condition:       Condition("[BODY].data > 0"),
+			Result:          &Result{Body: []byte("{\"data\": \"0o1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data > 0",
+		},
+		{
+			Name:            "body-jsonpath-octal-int-using-equal",
+			Condition:       Condition("[BODY].data == 2"),
+			Result:          &Result{Body: []byte("{\"data\": \"0o2\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 2",
+		},
+		{
+			Name:            "body-jsonpath-octal-int-using-equals",
+			Condition:       Condition("[BODY].data == 0o2"),
+			Result:          &Result{Body: []byte("{\"data\": \"0o2\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 0o2",
+		},
+		{
+			Name:            "body-jsonpath-binary-int-using-greater-than",
+			Condition:       Condition("[BODY].data > 0"),
+			Result:          &Result{Body: []byte("{\"data\": \"0b1\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data > 0",
+		},
+		{
+			Name:            "body-jsonpath-binary-int-using-equal",
+			Condition:       Condition("[BODY].data == 2"),
+			Result:          &Result{Body: []byte("{\"data\": \"0b0010\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 2",
+		},
+		{
+			Name:            "body-jsonpath-binary-int-using-equals",
+			Condition:       Condition("[BODY].data == 0b10"),
+			Result:          &Result{Body: []byte("{\"data\": \"0b0010\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == 0b10",
+		},
+		{
+			Name:            "body-jsonpath-complex-int-using-greater-than-failure",
+			Condition:       Condition("[BODY].data.id > 5"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 1}}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].data.id (1) > 5",
+		},
+		{
+			Name:            "body-jsonpath-float-using-greater-than-issue433", // As of v5.3.1, Gatus will convert a float to an int. We're losing precision, but it's better than just returning 0
+			Condition:       Condition("[BODY].balance > 100"),
+			Result:          &Result{Body: []byte(`{"balance": "123.40000000000005"}`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].balance > 100",
+		},
+		{
+			Name:            "body-jsonpath-complex-int-using-less-than",
+			Condition:       Condition("[BODY].data.id < 5"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 2}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data.id < 5",
+		},
+		{
+			Name:            "body-jsonpath-complex-int-using-less-than-failure",
+			Condition:       Condition("[BODY].data.id < 5"),
+			Result:          &Result{Body: []byte("{\"data\": {\"id\": 10}}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].data.id (10) < 5",
+		},
+		{
+			Name:            "connected",
+			Condition:       Condition("[CONNECTED] == true"),
+			Result:          &Result{Connected: true},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[CONNECTED] == true",
+		},
+		{
+			Name:            "connected-failure",
+			Condition:       Condition("[CONNECTED] == true"),
+			Result:          &Result{Connected: false},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[CONNECTED] (false) == true",
+		},
+		{
+			Name:            "certificate-expiration-not-set",
+			Condition:       Condition("[CERTIFICATE_EXPIRATION] == 0"),
+			Result:          &Result{},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[CERTIFICATE_EXPIRATION] == 0",
+		},
+		{
+			Name:            "certificate-expiration-greater-than-numerical",
+			Condition:       Condition("[CERTIFICATE_EXPIRATION] > " + strconv.FormatInt((time.Hour*24*28).Milliseconds(), 10)),
+			Result:          &Result{CertificateExpiration: time.Hour * 24 * 60},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[CERTIFICATE_EXPIRATION] > 2419200000",
+		},
+		{
+			Name:            "certificate-expiration-greater-than-numerical-failure",
+			Condition:       Condition("[CERTIFICATE_EXPIRATION] > " + strconv.FormatInt((time.Hour*24*28).Milliseconds(), 10)),
+			Result:          &Result{CertificateExpiration: time.Hour * 24 * 14},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[CERTIFICATE_EXPIRATION] (1209600000) > 2419200000",
+		},
+		{
+			Name:            "certificate-expiration-greater-than-duration",
+			Condition:       Condition("[CERTIFICATE_EXPIRATION] > 12h"),
+			Result:          &Result{CertificateExpiration: 24 * time.Hour},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[CERTIFICATE_EXPIRATION] > 12h",
+		},
+		{
+			Name:            "certificate-expiration-greater-than-duration",
+			Condition:       Condition("[CERTIFICATE_EXPIRATION] > 48h"),
+			Result:          &Result{CertificateExpiration: 24 * time.Hour},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[CERTIFICATE_EXPIRATION] (86400000) > 48h (172800000)",
+		},
+		{
+			Name:            "no-placeholders",
+			Condition:       Condition("1 == 2"),
+			Result:          &Result{},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "1 == 2",
+		},
+		///////////////
+		// Functions //
+		///////////////
+		// len
+		{
+			Name:            "len-body-jsonpath-complex",
+			Condition:       Condition("len([BODY].data.name) == 4"),
+			Result:          &Result{Body: []byte("{\"data\": {\"name\": \"john\"}}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].data.name) == 4",
+		},
+		{
+			Name:            "len-body-array",
+			Condition:       Condition("len([BODY]) == 3"),
+			Result:          &Result{Body: []byte("[{\"id\": 1}, {\"id\": 2}, {\"id\": 3}]")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY]) == 3",
+		},
+		{
+			Name:            "len-body-keyed-array",
+			Condition:       Condition("len([BODY].data) == 3"),
+			Result:          &Result{Body: []byte("{\"data\": [{\"id\": 1}, {\"id\": 2}, {\"id\": 3}]}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].data) == 3",
+		},
+		{
+			Name:            "len-body-array-invalid",
+			Condition:       Condition("len([BODY].data) == 8"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "len([BODY].data) (INVALID) == 8",
+		},
+		{
+			Name:            "len-body-string",
+			Condition:       Condition("len([BODY]) == 8"),
+			Result:          &Result{Body: []byte("john.doe")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY]) == 8",
+		},
+		{
+			Name:            "len-body-keyed-string",
+			Condition:       Condition("len([BODY].name) == 8"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].name) == 8",
+		},
+		{
+			Name:            "len-body-keyed-int",
+			Condition:       Condition("len([BODY].age) == 2"),
+			Result:          &Result{Body: []byte(`{"age":18}`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].age) == 2",
+		},
+		{
+			Name:            "len-body-keyed-bool",
+			Condition:       Condition("len([BODY].adult) == 4"),
+			Result:          &Result{Body: []byte(`{"adult":true}`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY].adult) == 4",
+		},
+		{
+			Name:            "len-body-object-inside-array",
+			Condition:       Condition("len([BODY][0]) == 23"),
+			Result:          &Result{Body: []byte(`[{"age":18,"adult":true}]`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY][0]) == 23",
+		},
+		{
+			Name:            "len-body-object-keyed-int-inside-array",
+			Condition:       Condition("len([BODY][0].age) == 2"),
+			Result:          &Result{Body: []byte(`[{"age":18,"adult":true}]`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY][0].age) == 2",
+		},
+		{
+			Name:            "len-body-keyed-bool-inside-array",
+			Condition:       Condition("len([BODY][0].adult) == 4"),
+			Result:          &Result{Body: []byte(`[{"age":18,"adult":true}]`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY][0].adult) == 4",
+		},
+		{
+			Name:            "len-body-object",
+			Condition:       Condition("len([BODY]) == 20"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "len([BODY]) == 20",
+		},
+		// pat
+		{
+			Name:            "pat-body-1",
+			Condition:       Condition("[BODY] == pat(*john*)"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] == pat(*john*)",
+		},
+		{
+			Name:            "pat-body-2",
+			Condition:       Condition("[BODY].name == pat(john*)"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].name == pat(john*)",
+		},
+		{
+			Name:            "pat-body-failure",
+			Condition:       Condition("[BODY].name == pat(bob*)"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].name (john.doe) == pat(bob*)",
+		},
+		{
+			Name:            "pat-body-html",
+			Condition:       Condition("[BODY] == pat(*<div id=\"user\">john.doe</div>*)"),
+			Result:          &Result{Body: []byte(`<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body><div id="user">john.doe</div></body></html>`)},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY] == pat(*<div id=\"user\">john.doe</div>*)",
+		},
+		{
+			Name:            "pat-body-html-failure",
+			Condition:       Condition("[BODY] == pat(*<div id=\"user\">john.doe</div>*)"),
+			Result:          &Result{Body: []byte(`<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body><div id="user">jane.doe</div></body></html>`)},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY] (<!DOCTYPE html><html lang...(truncated)) == pat(*<div id=\"user\">john.doe</div>*)",
+		},
+		{
+			Name:            "pat-body-html-failure-alt",
+			Condition:       Condition("pat(*<div id=\"user\">john.doe</div>*) == [BODY]"),
+			Result:          &Result{Body: []byte(`<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body><div id="user">jane.doe</div></body></html>`)},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "pat(*<div id=\"user\">john.doe</div>*) == [BODY] (<!DOCTYPE html><html lang...(truncated))",
+		},
+		{
+			Name:            "pat-body-in-array",
+			Condition:       Condition("[BODY].data == pat(*Whatever*)"),
+			Result:          &Result{Body: []byte("{\"data\": [\"hello\", \"world\", \"Whatever\"]}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].data == pat(*Whatever*)",
+		},
+		{
+			Name:            "pat-ip",
+			Condition:       Condition("[IP] == pat(10.*)"),
+			Result:          &Result{IP: "10.0.0.0"},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[IP] == pat(10.*)",
+		},
+		{
+			Name:            "pat-ip-failure",
+			Condition:       Condition("[IP] == pat(10.*)"),
+			Result:          &Result{IP: "255.255.255.255"},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[IP] (255.255.255.255) == pat(10.*)",
+		},
+		{
+			Name:            "pat-status",
+			Condition:       Condition("[STATUS] == pat(4*)"),
+			Result:          &Result{HTTPStatus: 404},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[STATUS] == pat(4*)",
+		},
+		{
+			Name:            "pat-status-failure",
+			Condition:       Condition("[STATUS] == pat(4*)"),
+			Result:          &Result{HTTPStatus: 200},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[STATUS] (200) == pat(4*)",
+		},
+		// any
+		{
+			Name:            "any-body-1",
+			Condition:       Condition("[BODY].name == any(john.doe, jane.doe)"),
+			Result:          &Result{Body: []byte("{\"name\": \"john.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].name == any(john.doe, jane.doe)",
+		},
+		{
+			Name:            "any-body-2",
+			Condition:       Condition("[BODY].name == any(john.doe, jane.doe)"),
+			Result:          &Result{Body: []byte("{\"name\": \"jane.doe\"}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[BODY].name == any(john.doe, jane.doe)",
+		},
+		{
+			Name:            "any-body-failure",
+			Condition:       Condition("[BODY].name == any(john.doe, jane.doe)"),
+			Result:          &Result{Body: []byte("{\"name\": \"bob\"}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[BODY].name (bob) == any(john.doe, jane.doe)",
+		},
+		{
+			Name:            "any-status-1",
+			Condition:       Condition("[STATUS] == any(200, 429)"),
+			Result:          &Result{HTTPStatus: 200},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[STATUS] == any(200, 429)",
+		},
+		{
+			Name:            "any-status-2",
+			Condition:       Condition("[STATUS] == any(200, 429)"),
+			Result:          &Result{HTTPStatus: 429},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "[STATUS] == any(200, 429)",
+		},
+		{
+			Name:            "any-status-reverse",
+			Condition:       Condition("any(200, 429) == [STATUS]"),
+			Result:          &Result{HTTPStatus: 429},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "any(200, 429) == [STATUS]",
+		},
+		{
+			Name:            "any-status-failure",
+			Condition:       Condition("[STATUS] == any(200, 429)"),
+			Result:          &Result{HTTPStatus: 404},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "[STATUS] (404) == any(200, 429)",
+		},
+		{
+			Name:                        "any-status-failure-but-dont-resolve",
+			Condition:                   Condition("[STATUS] == any(200, 429)"),
+			Result:                      &Result{HTTPStatus: 404},
+			DontResolveFailedConditions: true,
+			ExpectedSuccess:             false,
+			ExpectedOutput:              "[STATUS] == any(200, 429)",
+		},
+		// has
+		{
+			Name:            "has",
+			Condition:       Condition("has([BODY].errors) == false"),
+			Result:          &Result{Body: []byte("{}")},
+			ExpectedSuccess: true,
+			ExpectedOutput:  "has([BODY].errors) == false",
+		},
+		{
+			Name:                        "has-key-of-map",
+			Condition:                   Condition("has([BODY].article) == true"),
+			Result:                      &Result{Body: []byte("{\n  \"article\": {\n    \"id\": 123,\n    \"title\": \"Hello, world!\",\n    \"author\": \"John Doe\",\n    \"tags\": [\"hello\", \"world\"],\n    \"content\": \"I really like Gatus!\"\n  }\n}")},
+			DontResolveFailedConditions: false,
+			ExpectedSuccess:             true,
+			ExpectedOutput:              "has([BODY].article) == true",
+		},
+		{
+			Name:            "has-failure",
+			Condition:       Condition("has([BODY].errors) == false"),
+			Result:          &Result{Body: []byte("{\"errors\": [\"1\"]}")},
+			ExpectedSuccess: false,
+			ExpectedOutput:  "has([BODY].errors) (true) == false",
+		},
+		{
+			Name:                        "has-failure-but-dont-resolve",
+			Condition:                   Condition("has([BODY].errors) == false"),
+			Result:                      &Result{Body: []byte("{\"errors\": [\"1\"]}")},
+			DontResolveFailedConditions: true,
+			ExpectedSuccess:             false,
+			ExpectedOutput:              "has([BODY].errors) == false",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			scenario.Condition.evaluate(scenario.Result, scenario.DontResolveFailedConditions)
+			if scenario.Result.ConditionResults[0].Success != scenario.ExpectedSuccess {
+				t.Errorf("Condition '%s' should have been success=%v", scenario.Condition, scenario.ExpectedSuccess)
+			}
+			if scenario.Result.ConditionResults[0].Condition != scenario.ExpectedOutput {
+				t.Errorf("Condition '%s' should have resolved to '%s', got '%s'", scenario.Condition, scenario.ExpectedOutput, scenario.Result.ConditionResults[0].Condition)
+			}
+		})
+	}
+}
+
+func TestCondition_evaluateWithInvalidOperator(t *testing.T) {
+	condition := Condition("[STATUS] ? 201")
+	result := &Result{HTTPStatus: 201}
+	condition.evaluate(result, false)
+	if result.Success {
+		t.Error("condition was invalid, result should've been a failure")
+	}
+	if len(result.Errors) != 1 {
+		t.Error("condition was invalid, result should've had an error")
+	}
+}

config/endpoint/dns/dns.go

@@ -0,0 +1,38 @@
+package dns
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/miekg/dns"
+)
+
+var (
+	// ErrDNSWithNoQueryName is the error with which gatus will panic if a dns is configured without query name
+	ErrDNSWithNoQueryName = errors.New("you must specify a query name in the DNS configuration")
+
+	// ErrDNSWithInvalidQueryType is the error with which gatus will panic if a dns is configured with invalid query type
+	ErrDNSWithInvalidQueryType = errors.New("invalid query type in the DNS configuration")
+)
+
+// Config for an Endpoint of type DNS
+type Config struct {
+	// QueryType is the type for the DNS records like A, AAAA, CNAME...
+	QueryType string `yaml:"query-type"`
+
+	// QueryName is the query for DNS
+	QueryName string `yaml:"query-name"`
+}
+
+func (d *Config) ValidateAndSetDefault() error {
+	if len(d.QueryName) == 0 {
+		return ErrDNSWithNoQueryName
+	}
+	if !strings.HasSuffix(d.QueryName, ".") {
+		d.QueryName += "."
+	}
+	if _, ok := dns.StringToType[d.QueryType]; !ok {
+		return ErrDNSWithInvalidQueryType
+	}
+	return nil
+}

config/endpoint/dns/dns_test.go

@@ -0,0 +1,27 @@
+package dns
+
+import (
+	"testing"
+)
+
+func TestConfig_ValidateAndSetDefault(t *testing.T) {
+	dns := &Config{
+		QueryType: "A",
+		QueryName: "",
+	}
+	err := dns.ValidateAndSetDefault()
+	if err == nil {
+		t.Error("Should've returned an error because endpoint's dns didn't have a query name, which is a mandatory field for dns")
+	}
+}
+
+func TestConfig_ValidateAndSetDefaultsWithInvalidDNSQueryType(t *testing.T) {
+	dns := &Config{
+		QueryType: "B",
+		QueryName: "example.com",
+	}
+	err := dns.ValidateAndSetDefault()
+	if err == nil {
+		t.Error("Should've returned an error because endpoint's dns query type is invalid, it needs to be a valid query name like A, AAAA, CNAME...")
+	}
+}

config/endpoint/endpoint.go

@@ -0,0 +1,479 @@
+package endpoint
+
+import (
+	"bytes"
+	"crypto/x509"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint/dns"
+	sshconfig "github.com/TwiN/gatus/v5/config/endpoint/ssh"
+	"github.com/TwiN/gatus/v5/config/endpoint/ui"
+	"github.com/TwiN/gatus/v5/config/maintenance"
+	"golang.org/x/crypto/ssh"
+)
+
+type Type string
+
+const (
+	// HostHeader is the name of the header used to specify the host
+	HostHeader = "Host"
+
+	// ContentTypeHeader is the name of the header used to specify the content type
+	ContentTypeHeader = "Content-Type"
+
+	// UserAgentHeader is the name of the header used to specify the request's user agent
+	UserAgentHeader = "User-Agent"
+
+	// GatusUserAgent is the default user agent that Gatus uses to send requests.
+	GatusUserAgent = "Gatus/1.0"
+
+	TypeDNS      Type = "DNS"
+	TypeTCP      Type = "TCP"
+	TypeSCTP     Type = "SCTP"
+	TypeUDP      Type = "UDP"
+	TypeICMP     Type = "ICMP"
+	TypeSTARTTLS Type = "STARTTLS"
+	TypeTLS      Type = "TLS"
+	TypeHTTP     Type = "HTTP"
+	TypeWS       Type = "WEBSOCKET"
+	TypeSSH      Type = "SSH"
+	TypeUNKNOWN  Type = "UNKNOWN"
+)
+
+var (
+	// ErrEndpointWithNoCondition is the error with which Gatus will panic if an endpoint is configured with no conditions
+	ErrEndpointWithNoCondition = errors.New("you must specify at least one condition per endpoint")
+
+	// ErrEndpointWithNoURL is the error with which Gatus will panic if an endpoint is configured with no url
+	ErrEndpointWithNoURL = errors.New("you must specify an url for each endpoint")
+
+	// ErrUnknownEndpointType is the error with which Gatus will panic if an endpoint has an unknown type
+	ErrUnknownEndpointType = errors.New("unknown endpoint type")
+
+	// ErrInvalidConditionFormat is the error with which Gatus will panic if a condition has an invalid format
+	ErrInvalidConditionFormat = errors.New("invalid condition format: does not match '<VALUE> <COMPARATOR> <VALUE>'")
+
+	// ErrInvalidEndpointIntervalForDomainExpirationPlaceholder is the error with which Gatus will panic if an endpoint
+	// has both an interval smaller than 5 minutes and a condition with DomainExpirationPlaceholder.
+	// This is because the free whois service we are using should not be abused, especially considering the fact that
+	// the data takes a while to be updated.
+	ErrInvalidEndpointIntervalForDomainExpirationPlaceholder = errors.New("the minimum interval for an endpoint with a condition using the " + DomainExpirationPlaceholder + " placeholder is 300s (5m)")
+)
+
+// Endpoint is the configuration of a service to be monitored
+type Endpoint struct {
+	// Enabled defines whether to enable the monitoring of the endpoint
+	Enabled *bool `yaml:"enabled,omitempty"`
+
+	// Name of the endpoint. Can be anything.
+	Name string `yaml:"name"`
+
+	// Group the endpoint is a part of. Used for grouping multiple endpoints together on the front end.
+	Group string `yaml:"group,omitempty"`
+
+	// URL to send the request to
+	URL string `yaml:"url"`
+
+	// Method of the request made to the url of the endpoint
+	Method string `yaml:"method,omitempty"`
+
+	// Body of the request
+	Body string `yaml:"body,omitempty"`
+
+	// GraphQL is whether to wrap the body in a query param ({"query":"$body"})
+	GraphQL bool `yaml:"graphql,omitempty"`
+
+	// Headers of the request
+	Headers map[string]string `yaml:"headers,omitempty"`
+
+	// Interval is the duration to wait between every status check
+	Interval time.Duration `yaml:"interval,omitempty"`
+
+	// Conditions used to determine the health of the endpoint
+	Conditions []Condition `yaml:"conditions"`
+
+	// Alerts is the alerting configuration for the endpoint in case of failure
+	Alerts []*alert.Alert `yaml:"alerts,omitempty"`
+
+	// MaintenanceWindow is the configuration for per-endpoint maintenance windows
+	MaintenanceWindows []*maintenance.Config `yaml:"maintenance-windows,omitempty"`
+
+	// DNSConfig is the configuration for DNS monitoring
+	DNSConfig *dns.Config `yaml:"dns,omitempty"`
+
+	// SSH is the configuration for SSH monitoring
+	SSHConfig *sshconfig.Config `yaml:"ssh,omitempty"`
+
+	// ClientConfig is the configuration of the client used to communicate with the endpoint's target
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+
+	// UIConfig is the configuration for the UI
+	UIConfig *ui.Config `yaml:"ui,omitempty"`
+
+	// NumberOfFailuresInARow is the number of unsuccessful evaluations in a row
+	NumberOfFailuresInARow int `yaml:"-"`
+
+	// NumberOfSuccessesInARow is the number of successful evaluations in a row
+	NumberOfSuccessesInARow int `yaml:"-"`
+}
+
+// IsEnabled returns whether the endpoint is enabled or not
+func (e *Endpoint) IsEnabled() bool {
+	if e.Enabled == nil {
+		return true
+	}
+	return *e.Enabled
+}
+
+// Type returns the endpoint type
+func (e *Endpoint) Type() Type {
+	switch {
+	case e.DNSConfig != nil:
+		return TypeDNS
+	case strings.HasPrefix(e.URL, "tcp://"):
+		return TypeTCP
+	case strings.HasPrefix(e.URL, "sctp://"):
+		return TypeSCTP
+	case strings.HasPrefix(e.URL, "udp://"):
+		return TypeUDP
+	case strings.HasPrefix(e.URL, "icmp://"):
+		return TypeICMP
+	case strings.HasPrefix(e.URL, "starttls://"):
+		return TypeSTARTTLS
+	case strings.HasPrefix(e.URL, "tls://"):
+		return TypeTLS
+	case strings.HasPrefix(e.URL, "http://") || strings.HasPrefix(e.URL, "https://"):
+		return TypeHTTP
+	case strings.HasPrefix(e.URL, "ws://") || strings.HasPrefix(e.URL, "wss://"):
+		return TypeWS
+	case strings.HasPrefix(e.URL, "ssh://"):
+		return TypeSSH
+	default:
+		return TypeUNKNOWN
+	}
+}
+
+// ValidateAndSetDefaults validates the endpoint's configuration and sets the default value of args that have one
+func (e *Endpoint) ValidateAndSetDefaults() error {
+	if err := validateEndpointNameGroupAndAlerts(e.Name, e.Group, e.Alerts); err != nil {
+		return err
+	}
+	if len(e.URL) == 0 {
+		return ErrEndpointWithNoURL
+	}
+	if e.ClientConfig == nil {
+		e.ClientConfig = client.GetDefaultConfig()
+	} else {
+		if err := e.ClientConfig.ValidateAndSetDefaults(); err != nil {
+			return err
+		}
+	}
+	if e.UIConfig == nil {
+		e.UIConfig = ui.GetDefaultConfig()
+	} else {
+		if err := e.UIConfig.ValidateAndSetDefaults(); err != nil {
+			return err
+		}
+	}
+	if e.Interval == 0 {
+		e.Interval = 1 * time.Minute
+	}
+	if len(e.Method) == 0 {
+		e.Method = http.MethodGet
+	}
+	if len(e.Headers) == 0 {
+		e.Headers = make(map[string]string)
+	}
+	// Automatically add user agent header if there isn't one specified in the endpoint configuration
+	if _, userAgentHeaderExists := e.Headers[UserAgentHeader]; !userAgentHeaderExists {
+		e.Headers[UserAgentHeader] = GatusUserAgent
+	}
+	// Automatically add "Content-Type: application/json" header if there's no Content-Type set
+	// and endpoint.GraphQL is set to true
+	if _, contentTypeHeaderExists := e.Headers[ContentTypeHeader]; !contentTypeHeaderExists && e.GraphQL {
+		e.Headers[ContentTypeHeader] = "application/json"
+	}
+	if len(e.Conditions) == 0 {
+		return ErrEndpointWithNoCondition
+	}
+	for _, c := range e.Conditions {
+		if e.Interval < 5*time.Minute && c.hasDomainExpirationPlaceholder() {
+			return ErrInvalidEndpointIntervalForDomainExpirationPlaceholder
+		}
+		if err := c.Validate(); err != nil {
+			return fmt.Errorf("%v: %w", ErrInvalidConditionFormat, err)
+		}
+	}
+	if e.DNSConfig != nil {
+		return e.DNSConfig.ValidateAndSetDefault()
+	}
+	if e.SSHConfig != nil {
+		return e.SSHConfig.Validate()
+	}
+	if e.Type() == TypeUNKNOWN {
+		return ErrUnknownEndpointType
+	}
+	for _, maintenanceWindow := range e.MaintenanceWindows {
+		if err := maintenanceWindow.ValidateAndSetDefaults(); err != nil {
+			return err
+		}
+	}
+	// Make sure that the request can be created
+	_, err := http.NewRequest(e.Method, e.URL, bytes.NewBuffer([]byte(e.Body)))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// DisplayName returns an identifier made up of the Name and, if not empty, the Group.
+func (e *Endpoint) DisplayName() string {
+	if len(e.Group) > 0 {
+		return e.Group + "/" + e.Name
+	}
+	return e.Name
+}
+
+// Key returns the unique key for the Endpoint
+func (e *Endpoint) Key() string {
+	return ConvertGroupAndEndpointNameToKey(e.Group, e.Name)
+}
+
+// Close HTTP connections between watchdog and endpoints to avoid dangling socket file descriptors
+// on configuration reload.
+// More context on https://github.com/TwiN/gatus/issues/536
+func (e *Endpoint) Close() {
+	if e.Type() == TypeHTTP {
+		client.GetHTTPClient(e.ClientConfig).CloseIdleConnections()
+	}
+}
+
+// EvaluateHealth sends a request to the endpoint's URL and evaluates the conditions of the endpoint.
+func (e *Endpoint) EvaluateHealth() *Result {
+	result := &Result{Success: true, Errors: []string{}}
+	// Parse or extract hostname from URL
+	if e.DNSConfig != nil {
+		result.Hostname = strings.TrimSuffix(e.URL, ":53")
+	} else {
+		urlObject, err := url.Parse(e.URL)
+		if err != nil {
+			result.AddError(err.Error())
+		} else {
+			result.Hostname = urlObject.Hostname()
+			result.port = urlObject.Port()
+		}
+	}
+	// Retrieve IP if necessary
+	if e.needsToRetrieveIP() {
+		e.getIP(result)
+	}
+	// Retrieve domain expiration if necessary
+	if e.needsToRetrieveDomainExpiration() && len(result.Hostname) > 0 {
+		var err error
+		if result.DomainExpiration, err = client.GetDomainExpiration(result.Hostname); err != nil {
+			result.AddError(err.Error())
+		}
+	}
+	// Call the endpoint (if there's no errors)
+	if len(result.Errors) == 0 {
+		e.call(result)
+	} else {
+		result.Success = false
+	}
+	// Evaluate the conditions
+	for _, condition := range e.Conditions {
+		success := condition.evaluate(result, e.UIConfig.DontResolveFailedConditions)
+		if !success {
+			result.Success = false
+		}
+	}
+	result.Timestamp = time.Now()
+	// Clean up parameters that we don't need to keep in the results
+	if e.UIConfig.HideURL {
+		for errIdx, errorString := range result.Errors {
+			result.Errors[errIdx] = strings.ReplaceAll(errorString, e.URL, "<redacted>")
+		}
+	}
+	if e.UIConfig.HideHostname {
+		for errIdx, errorString := range result.Errors {
+			result.Errors[errIdx] = strings.ReplaceAll(errorString, result.Hostname, "<redacted>")
+		}
+		result.Hostname = "" // remove it from the result so it doesn't get exposed
+	}
+	if e.UIConfig.HidePort && len(result.port) > 0 {
+		for errIdx, errorString := range result.Errors {
+			result.Errors[errIdx] = strings.ReplaceAll(errorString, result.port, "<redacted>")
+		}
+		result.port = ""
+	}
+	if e.UIConfig.HideConditions {
+		result.ConditionResults = nil
+	}
+	return result
+}
+
+func (e *Endpoint) getIP(result *Result) {
+	if ips, err := net.LookupIP(result.Hostname); err != nil {
+		result.AddError(err.Error())
+		return
+	} else {
+		result.IP = ips[0].String()
+	}
+}
+
+func (e *Endpoint) call(result *Result) {
+	var request *http.Request
+	var response *http.Response
+	var err error
+	var certificate *x509.Certificate
+	endpointType := e.Type()
+	if endpointType == TypeHTTP {
+		request = e.buildHTTPRequest()
+	}
+	startTime := time.Now()
+	if endpointType == TypeDNS {
+		result.Connected, result.DNSRCode, result.Body, err = client.QueryDNS(e.DNSConfig.QueryType, e.DNSConfig.QueryName, e.URL)
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		result.Duration = time.Since(startTime)
+	} else if endpointType == TypeSTARTTLS || endpointType == TypeTLS {
+		if endpointType == TypeSTARTTLS {
+			result.Connected, certificate, err = client.CanPerformStartTLS(strings.TrimPrefix(e.URL, "starttls://"), e.ClientConfig)
+		} else {
+			result.Connected, certificate, err = client.CanPerformTLS(strings.TrimPrefix(e.URL, "tls://"), e.ClientConfig)
+		}
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		result.Duration = time.Since(startTime)
+		result.CertificateExpiration = time.Until(certificate.NotAfter)
+	} else if endpointType == TypeTCP {
+		result.Connected = client.CanCreateTCPConnection(strings.TrimPrefix(e.URL, "tcp://"), e.ClientConfig)
+		result.Duration = time.Since(startTime)
+	} else if endpointType == TypeUDP {
+		result.Connected = client.CanCreateUDPConnection(strings.TrimPrefix(e.URL, "udp://"), e.ClientConfig)
+		result.Duration = time.Since(startTime)
+	} else if endpointType == TypeSCTP {
+		result.Connected = client.CanCreateSCTPConnection(strings.TrimPrefix(e.URL, "sctp://"), e.ClientConfig)
+		result.Duration = time.Since(startTime)
+	} else if endpointType == TypeICMP {
+		result.Connected, result.Duration = client.Ping(strings.TrimPrefix(e.URL, "icmp://"), e.ClientConfig)
+	} else if endpointType == TypeWS {
+		result.Connected, result.Body, err = client.QueryWebSocket(e.URL, e.Body, e.ClientConfig)
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		result.Duration = time.Since(startTime)
+	} else if endpointType == TypeSSH {
+		// If there's no username/password specified, attempt to validate just the SSH banner
+		if len(e.SSHConfig.Username) == 0 && len(e.SSHConfig.Password) == 0 {
+			result.Connected, result.HTTPStatus, err =
+				client.CheckSSHBanner(strings.TrimPrefix(e.URL, "ssh://"), e.ClientConfig)
+			if err != nil {
+				result.AddError(err.Error())
+				return
+			}
+			result.Success = result.Connected
+			result.Duration = time.Since(startTime)
+			return
+		}
+		var cli *ssh.Client
+		result.Connected, cli, err = client.CanCreateSSHConnection(strings.TrimPrefix(e.URL, "ssh://"), e.SSHConfig.Username, e.SSHConfig.Password, e.ClientConfig)
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		result.Success, result.HTTPStatus, err = client.ExecuteSSHCommand(cli, e.Body, e.ClientConfig)
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		result.Duration = time.Since(startTime)
+	} else {
+		response, err = client.GetHTTPClient(e.ClientConfig).Do(request)
+		result.Duration = time.Since(startTime)
+		if err != nil {
+			result.AddError(err.Error())
+			return
+		}
+		defer response.Body.Close()
+		if response.TLS != nil && len(response.TLS.PeerCertificates) > 0 {
+			certificate = response.TLS.PeerCertificates[0]
+			result.CertificateExpiration = time.Until(certificate.NotAfter)
+		}
+		result.HTTPStatus = response.StatusCode
+		result.Connected = response.StatusCode > 0
+		// Only read the Body if there's a condition that uses the BodyPlaceholder
+		if e.needsToReadBody() {
+			result.Body, err = io.ReadAll(response.Body)
+			if err != nil {
+				result.AddError("error reading response body:" + err.Error())
+			}
+		}
+	}
+}
+
+func (e *Endpoint) buildHTTPRequest() *http.Request {
+	var bodyBuffer *bytes.Buffer
+	if e.GraphQL {
+		graphQlBody := map[string]string{
+			"query": e.Body,
+		}
+		body, _ := json.Marshal(graphQlBody)
+		bodyBuffer = bytes.NewBuffer(body)
+	} else {
+		bodyBuffer = bytes.NewBuffer([]byte(e.Body))
+	}
+	request, _ := http.NewRequest(e.Method, e.URL, bodyBuffer)
+	for k, v := range e.Headers {
+		request.Header.Set(k, v)
+		if k == HostHeader {
+			request.Host = v
+		}
+	}
+	return request
+}
+
+// needsToReadBody checks if there's any condition that requires the response Body to be read
+func (e *Endpoint) needsToReadBody() bool {
+	for _, condition := range e.Conditions {
+		if condition.hasBodyPlaceholder() {
+			return true
+		}
+	}
+	return false
+}
+
+// needsToRetrieveDomainExpiration checks if there's any condition that requires a whois query to be performed
+func (e *Endpoint) needsToRetrieveDomainExpiration() bool {
+	for _, condition := range e.Conditions {
+		if condition.hasDomainExpirationPlaceholder() {
+			return true
+		}
+	}
+	return false
+}
+
+// needsToRetrieveIP checks if there's any condition that requires an IP lookup
+func (e *Endpoint) needsToRetrieveIP() bool {
+	for _, condition := range e.Conditions {
+		if condition.hasIPPlaceholder() {
+			return true
+		}
+	}
+	return false
+}

config/endpoint/endpoint_test.go

@@ -0,0 +1,934 @@
+package endpoint
+
+import (
+	"bytes"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint/dns"
+	"github.com/TwiN/gatus/v5/config/endpoint/ssh"
+	"github.com/TwiN/gatus/v5/config/endpoint/ui"
+	"github.com/TwiN/gatus/v5/config/maintenance"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestEndpoint(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	scenarios := []struct {
+		Name             string
+		Endpoint         Endpoint
+		ExpectedResult   *Result
+		MockRoundTripper test.MockRoundTripper
+	}{
+		{
+			Name: "success",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[STATUS] == 200", "[BODY].status == UP", "[CERTIFICATE_EXPIRATION] > 24h"},
+			},
+			ExpectedResult: &Result{
+				Success:   true,
+				Connected: true,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[STATUS] == 200", Success: true},
+					{Condition: "[BODY].status == UP", Success: true},
+					{Condition: "[CERTIFICATE_EXPIRATION] > 24h", Success: true},
+				},
+				DomainExpiration: 0, // Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{
+					StatusCode: http.StatusOK,
+					Body:       io.NopCloser(bytes.NewBufferString(`{"status": "UP"}`)),
+					TLS:        &tls.ConnectionState{PeerCertificates: []*x509.Certificate{{NotAfter: time.Now().Add(9999 * time.Hour)}}},
+				}
+			}),
+		},
+		{
+			Name: "failed-body-condition",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[STATUS] == 200", "[BODY].status == UP"},
+			},
+			ExpectedResult: &Result{
+				Success:   false,
+				Connected: true,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[STATUS] == 200", Success: true},
+					{Condition: "[BODY].status (DOWN) == UP", Success: false},
+				},
+				DomainExpiration: 0, // Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: io.NopCloser(bytes.NewBufferString(`{"status": "DOWN"}`))}
+			}),
+		},
+		{
+			Name: "failed-status-condition",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[STATUS] == 200"},
+			},
+			ExpectedResult: &Result{
+				Success:   false,
+				Connected: true,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[STATUS] (502) == 200", Success: false},
+				},
+				DomainExpiration: 0, // Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusBadGateway, Body: http.NoBody}
+			}),
+		},
+		{
+			Name: "failed-status-condition-with-hidden-conditions",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[STATUS] == 200"},
+				UIConfig:   &ui.Config{HideConditions: true},
+			},
+			ExpectedResult: &Result{
+				Success:          false,
+				Connected:        true,
+				Hostname:         "twin.sh",
+				ConditionResults: []*ConditionResult{}, // Because UIConfig.HideConditions is true, the condition results should not be shown.
+				DomainExpiration: 0,                    // Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusBadGateway, Body: http.NoBody}
+			}),
+		},
+		{
+			Name: "condition-with-failed-certificate-expiration",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[CERTIFICATE_EXPIRATION] > 100h"},
+				UIConfig:   &ui.Config{DontResolveFailedConditions: true},
+			},
+			ExpectedResult: &Result{
+				Success:   false,
+				Connected: true,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					// Because UIConfig.DontResolveFailedConditions is true, the values in the condition should not be resolved
+					{Condition: "[CERTIFICATE_EXPIRATION] > 100h", Success: false},
+				},
+				DomainExpiration: 0, // Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{
+					StatusCode: http.StatusOK,
+					Body:       http.NoBody,
+					TLS:        &tls.ConnectionState{PeerCertificates: []*x509.Certificate{{NotAfter: time.Now().Add(5 * time.Hour)}}},
+				}
+			}),
+		},
+		{
+			Name: "domain-expiration",
+			Endpoint: Endpoint{
+				Name:       "website-health",
+				URL:        "https://twin.sh/health",
+				Conditions: []Condition{"[DOMAIN_EXPIRATION] > 100h"},
+				Interval:   5 * time.Minute,
+			},
+			ExpectedResult: &Result{
+				Success:   true,
+				Connected: true,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[DOMAIN_EXPIRATION] > 100h", Success: true},
+				},
+				DomainExpiration: 999999 * time.Hour, // Note that this test only checks if it's non-zero.
+			},
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+		},
+		{
+			Name: "endpoint-that-will-time-out-and-hidden-hostname",
+			Endpoint: Endpoint{
+				Name:         "endpoint-that-will-time-out",
+				URL:          "https://twin.sh:9999/health",
+				Conditions:   []Condition{"[CONNECTED] == true"},
+				UIConfig:     &ui.Config{HideHostname: true, HidePort: true},
+				ClientConfig: &client.Config{Timeout: time.Millisecond},
+			},
+			ExpectedResult: &Result{
+				Success:   false,
+				Connected: false,
+				Hostname:  "", // Because Endpoint.UIConfig.HideHostname is true, this should be empty.
+				ConditionResults: []*ConditionResult{
+					{Condition: "[CONNECTED] (false) == true", Success: false},
+				},
+				// Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+				DomainExpiration: 0,
+				// Because Endpoint.UIConfig.HideHostname is true, the hostname should be replaced by <redacted>.
+				Errors: []string{`Get "https://<redacted>:<redacted>/health": context deadline exceeded (Client.Timeout exceeded while awaiting headers)`},
+			},
+			MockRoundTripper: nil,
+		},
+		{
+			Name: "endpoint-that-will-time-out-and-hidden-url",
+			Endpoint: Endpoint{
+				Name:         "endpoint-that-will-time-out",
+				URL:          "https://twin.sh/health",
+				Conditions:   []Condition{"[CONNECTED] == true"},
+				UIConfig:     &ui.Config{HideURL: true},
+				ClientConfig: &client.Config{Timeout: time.Millisecond},
+			},
+			ExpectedResult: &Result{
+				Success:   false,
+				Connected: false,
+				Hostname:  "twin.sh",
+				ConditionResults: []*ConditionResult{
+					{Condition: "[CONNECTED] (false) == true", Success: false},
+				},
+				// Because there's no [DOMAIN_EXPIRATION] condition, this is not resolved, so it should be 0.
+				DomainExpiration: 0,
+				// Because Endpoint.UIConfig.HideURL is true, the URL should be replaced by <redacted>.
+				Errors: []string{`Get "<redacted>": context deadline exceeded (Client.Timeout exceeded while awaiting headers)`},
+			},
+			MockRoundTripper: nil,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			if scenario.MockRoundTripper != nil {
+				mockClient := &http.Client{Transport: scenario.MockRoundTripper}
+				if scenario.Endpoint.ClientConfig != nil && scenario.Endpoint.ClientConfig.Timeout > 0 {
+					mockClient.Timeout = scenario.Endpoint.ClientConfig.Timeout
+				}
+				client.InjectHTTPClient(mockClient)
+			} else {
+				client.InjectHTTPClient(nil)
+			}
+			err := scenario.Endpoint.ValidateAndSetDefaults()
+			if err != nil {
+				t.Error("did not expect an error, got", err)
+			}
+			result := scenario.Endpoint.EvaluateHealth()
+			if result.Success != scenario.ExpectedResult.Success {
+				t.Errorf("Expected success to be %v, got %v", scenario.ExpectedResult.Success, result.Success)
+			}
+			if result.Connected != scenario.ExpectedResult.Connected {
+				t.Errorf("Expected connected to be %v, got %v", scenario.ExpectedResult.Connected, result.Connected)
+			}
+			if result.Hostname != scenario.ExpectedResult.Hostname {
+				t.Errorf("Expected hostname to be %v, got %v", scenario.ExpectedResult.Hostname, result.Hostname)
+			}
+			if len(result.ConditionResults) != len(scenario.ExpectedResult.ConditionResults) {
+				t.Errorf("Expected %v condition results, got %v", len(scenario.ExpectedResult.ConditionResults), len(result.ConditionResults))
+			} else {
+				for i, conditionResult := range result.ConditionResults {
+					if conditionResult.Condition != scenario.ExpectedResult.ConditionResults[i].Condition {
+						t.Errorf("Expected condition to be %v, got %v", scenario.ExpectedResult.ConditionResults[i].Condition, conditionResult.Condition)
+					}
+					if conditionResult.Success != scenario.ExpectedResult.ConditionResults[i].Success {
+						t.Errorf("Expected success of condition '%s' to be %v, got %v", conditionResult.Condition, scenario.ExpectedResult.ConditionResults[i].Success, conditionResult.Success)
+					}
+				}
+			}
+			if len(result.Errors) != len(scenario.ExpectedResult.Errors) {
+				t.Errorf("Expected %v errors, got %v", len(scenario.ExpectedResult.Errors), len(result.Errors))
+			} else {
+				for i, err := range result.Errors {
+					if err != scenario.ExpectedResult.Errors[i] {
+						t.Errorf("Expected error to be %v, got %v", scenario.ExpectedResult.Errors[i], err)
+					}
+				}
+			}
+			if result.DomainExpiration != scenario.ExpectedResult.DomainExpiration {
+				// Note that DomainExpiration is only resolved if there's a condition with the DomainExpirationPlaceholder in it.
+				// In other words, if there's no condition with [DOMAIN_EXPIRATION] in it, the DomainExpiration field will be 0.
+				// Because this is a live call, mocking it would be too much of a pain, so we're just going to check if
+				// the actual value is non-zero when the expected result is non-zero.
+				if scenario.ExpectedResult.DomainExpiration.Hours() > 0 && !(result.DomainExpiration.Hours() > 0) {
+					t.Errorf("Expected domain expiration to be non-zero, got %v", result.DomainExpiration)
+				}
+			}
+		})
+	}
+}
+
+func TestEndpoint_IsEnabled(t *testing.T) {
+	if !(&Endpoint{Enabled: nil}).IsEnabled() {
+		t.Error("endpoint.IsEnabled() should've returned true, because Enabled was set to nil")
+	}
+	if value := false; (&Endpoint{Enabled: &value}).IsEnabled() {
+		t.Error("endpoint.IsEnabled() should've returned false, because Enabled was set to false")
+	}
+	if value := true; !(&Endpoint{Enabled: &value}).IsEnabled() {
+		t.Error("Endpoint.IsEnabled() should've returned true, because Enabled was set to true")
+	}
+}
+
+func TestEndpoint_Type(t *testing.T) {
+	type args struct {
+		URL string
+		DNS *dns.Config
+		SSH *ssh.Config
+	}
+	tests := []struct {
+		args args
+		want Type
+	}{
+		{
+			args: args{
+				URL: "8.8.8.8",
+				DNS: &dns.Config{
+					QueryType: "A",
+					QueryName: "example.com",
+				},
+			},
+			want: TypeDNS,
+		},
+		{
+			args: args{
+				URL: "tcp://127.0.0.1:6379",
+			},
+			want: TypeTCP,
+		},
+		{
+			args: args{
+				URL: "icmp://example.com",
+			},
+			want: TypeICMP,
+		},
+		{
+			args: args{
+				URL: "sctp://example.com",
+			},
+			want: TypeSCTP,
+		},
+		{
+			args: args{
+				URL: "udp://example.com",
+			},
+			want: TypeUDP,
+		},
+		{
+			args: args{
+				URL: "starttls://smtp.gmail.com:587",
+			},
+			want: TypeSTARTTLS,
+		},
+		{
+			args: args{
+				URL: "tls://example.com:443",
+			},
+			want: TypeTLS,
+		},
+		{
+			args: args{
+				URL: "https://twin.sh/health",
+			},
+			want: TypeHTTP,
+		},
+		{
+			args: args{
+				URL: "wss://example.com/",
+			},
+			want: TypeWS,
+		},
+		{
+			args: args{
+				URL: "ws://example.com/",
+			},
+			want: TypeWS,
+		},
+		{
+			args: args{
+				URL: "ssh://example.com:22",
+				SSH: &ssh.Config{
+					Username: "root",
+					Password: "password",
+				},
+			},
+			want: TypeSSH,
+		},
+		{
+			args: args{
+				URL: "invalid://example.org",
+			},
+			want: TypeUNKNOWN,
+		},
+		{
+			args: args{
+				URL: "no-scheme",
+			},
+			want: TypeUNKNOWN,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(string(tt.want), func(t *testing.T) {
+			endpoint := Endpoint{
+				URL:       tt.args.URL,
+				DNSConfig: tt.args.DNS,
+			}
+			if got := endpoint.Type(); got != tt.want {
+				t.Errorf("Endpoint.Type() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaults(t *testing.T) {
+	endpoint := Endpoint{
+		Name:               "website-health",
+		URL:                "https://twin.sh/health",
+		Conditions:         []Condition{Condition("[STATUS] == 200")},
+		Alerts:             []*alert.Alert{{Type: alert.TypePagerDuty}},
+		MaintenanceWindows: []*maintenance.Config{{Start: "03:50", Duration: 4 * time.Hour}},
+	}
+	if err := endpoint.ValidateAndSetDefaults(); err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+	if endpoint.ClientConfig == nil {
+		t.Error("client configuration should've been set to the default configuration")
+	} else {
+		if endpoint.ClientConfig.Insecure != client.GetDefaultConfig().Insecure {
+			t.Errorf("Default client configuration should've set Insecure to %v, got %v", client.GetDefaultConfig().Insecure, endpoint.ClientConfig.Insecure)
+		}
+		if endpoint.ClientConfig.IgnoreRedirect != client.GetDefaultConfig().IgnoreRedirect {
+			t.Errorf("Default client configuration should've set IgnoreRedirect to %v, got %v", client.GetDefaultConfig().IgnoreRedirect, endpoint.ClientConfig.IgnoreRedirect)
+		}
+		if endpoint.ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+			t.Errorf("Default client configuration should've set Timeout to %v, got %v", client.GetDefaultConfig().Timeout, endpoint.ClientConfig.Timeout)
+		}
+	}
+	if endpoint.Method != "GET" {
+		t.Error("Endpoint method should've defaulted to GET")
+	}
+	if endpoint.Interval != time.Minute {
+		t.Error("Endpoint interval should've defaulted to 1 minute")
+	}
+	if endpoint.Headers == nil {
+		t.Error("Endpoint headers should've defaulted to an empty map")
+	}
+	if len(endpoint.Alerts) != 1 {
+		t.Error("Endpoint should've had 1 alert")
+	}
+	if !endpoint.Alerts[0].IsEnabled() {
+		t.Error("Endpoint alert should've defaulted to true")
+	}
+	if endpoint.Alerts[0].SuccessThreshold != 2 {
+		t.Error("Endpoint alert should've defaulted to a success threshold of 2")
+	}
+	if endpoint.Alerts[0].FailureThreshold != 3 {
+		t.Error("Endpoint alert should've defaulted to a failure threshold of 3")
+	}
+	if len(endpoint.MaintenanceWindows) != 1 {
+		t.Error("Endpoint should've had 1 maintenance window")
+	}
+	if !endpoint.MaintenanceWindows[0].IsEnabled() {
+		t.Error("Endpoint maintenance should've defaulted to true")
+	}
+	if endpoint.MaintenanceWindows[0].Timezone != "UTC" {
+		t.Error("Endpoint maintenance should've defaulted to UTC")
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaultsWithInvalidCondition(t *testing.T) {
+	endpoint := Endpoint{
+		Name:       "invalid-condition",
+		URL:        "https://twin.sh/health",
+		Conditions: []Condition{"[STATUS] invalid 200"},
+	}
+	if err := endpoint.ValidateAndSetDefaults(); err == nil {
+		t.Error("endpoint validation should've returned an error, but didn't")
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaultsWithClientConfig(t *testing.T) {
+	endpoint := Endpoint{
+		Name:       "website-health",
+		URL:        "https://twin.sh/health",
+		Conditions: []Condition{Condition("[STATUS] == 200")},
+		ClientConfig: &client.Config{
+			Insecure:       true,
+			IgnoreRedirect: true,
+			Timeout:        0,
+		},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	if endpoint.ClientConfig == nil {
+		t.Error("client configuration should've been set to the default configuration")
+	} else {
+		if !endpoint.ClientConfig.Insecure {
+			t.Error("endpoint.ClientConfig.Insecure should've been set to true")
+		}
+		if !endpoint.ClientConfig.IgnoreRedirect {
+			t.Error("endpoint.ClientConfig.IgnoreRedirect should've been set to true")
+		}
+		if endpoint.ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+			t.Error("endpoint.ClientConfig.Timeout should've been set to 10s, because the timeout value entered is not set or invalid")
+		}
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaultsWithDNS(t *testing.T) {
+	endpoint := &Endpoint{
+		Name: "dns-test",
+		URL:  "https://example.com",
+		DNSConfig: &dns.Config{
+			QueryType: "A",
+			QueryName: "example.com",
+		},
+		Conditions: []Condition{Condition("[DNS_RCODE] == NOERROR")},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Error("did not expect an error, got", err)
+	}
+	if endpoint.DNSConfig.QueryName != "example.com." {
+		t.Error("Endpoint.dns.query-name should be formatted with . suffix")
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaultsWithSSH(t *testing.T) {
+	scenarios := []struct {
+		name        string
+		username    string
+		password    string
+		expectedErr error
+	}{
+		{
+			name:        "fail when has no user",
+			username:    "",
+			password:    "password",
+			expectedErr: ssh.ErrEndpointWithoutSSHUsername,
+		},
+		{
+			name:        "fail when has no password",
+			username:    "username",
+			password:    "",
+			expectedErr: ssh.ErrEndpointWithoutSSHPassword,
+		},
+		{
+			name:        "success when all fields are set",
+			username:    "username",
+			password:    "password",
+			expectedErr: nil,
+		},
+	}
+
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			endpoint := &Endpoint{
+				Name: "ssh-test",
+				URL:  "https://example.com",
+				SSHConfig: &ssh.Config{
+					Username: scenario.username,
+					Password: scenario.password,
+				},
+				Conditions: []Condition{Condition("[STATUS] == 0")},
+			}
+			err := endpoint.ValidateAndSetDefaults()
+			if !errors.Is(err, scenario.expectedErr) {
+				t.Errorf("expected error %v, got %v", scenario.expectedErr, err)
+			}
+		})
+	}
+}
+
+func TestEndpoint_ValidateAndSetDefaultsWithSimpleErrors(t *testing.T) {
+	scenarios := []struct {
+		endpoint    *Endpoint
+		expectedErr error
+	}{
+		{
+			endpoint: &Endpoint{
+				Name:       "",
+				URL:        "https://example.com",
+				Conditions: []Condition{Condition("[STATUS] == 200")},
+			},
+			expectedErr: ErrEndpointWithNoName,
+		},
+		{
+			endpoint: &Endpoint{
+				Name:       "endpoint-with-no-url",
+				URL:        "",
+				Conditions: []Condition{Condition("[STATUS] == 200")},
+			},
+			expectedErr: ErrEndpointWithNoURL,
+		},
+		{
+			endpoint: &Endpoint{
+				Name:       "endpoint-with-no-conditions",
+				URL:        "https://example.com",
+				Conditions: nil,
+			},
+			expectedErr: ErrEndpointWithNoCondition,
+		},
+		{
+			endpoint: &Endpoint{
+				Name:       "domain-expiration-with-bad-interval",
+				URL:        "https://example.com",
+				Interval:   time.Minute,
+				Conditions: []Condition{Condition("[DOMAIN_EXPIRATION] > 720h")},
+			},
+			expectedErr: ErrInvalidEndpointIntervalForDomainExpirationPlaceholder,
+		},
+		{
+			endpoint: &Endpoint{
+				Name:       "domain-expiration-with-good-interval",
+				URL:        "https://example.com",
+				Interval:   5 * time.Minute,
+				Conditions: []Condition{Condition("[DOMAIN_EXPIRATION] > 720h")},
+			},
+			expectedErr: nil,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.endpoint.Name, func(t *testing.T) {
+			if err := scenario.endpoint.ValidateAndSetDefaults(); err != scenario.expectedErr {
+				t.Errorf("Expected error %v, got %v", scenario.expectedErr, err)
+			}
+		})
+	}
+}
+
+func TestEndpoint_buildHTTPRequest(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	endpoint := Endpoint{
+		Name:       "website-health",
+		URL:        "https://twin.sh/health",
+		Conditions: []Condition{condition},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	request := endpoint.buildHTTPRequest()
+	if request.Method != "GET" {
+		t.Error("request.Method should've been GET, but was", request.Method)
+	}
+	if request.Host != "twin.sh" {
+		t.Error("request.Host should've been twin.sh, but was", request.Host)
+	}
+	if userAgent := request.Header.Get("User-Agent"); userAgent != GatusUserAgent {
+		t.Errorf("request.Header.Get(User-Agent) should've been %s, but was %s", GatusUserAgent, userAgent)
+	}
+}
+
+func TestEndpoint_buildHTTPRequestWithCustomUserAgent(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	endpoint := Endpoint{
+		Name:       "website-health",
+		URL:        "https://twin.sh/health",
+		Conditions: []Condition{condition},
+		Headers: map[string]string{
+			"User-Agent": "Test/2.0",
+		},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	request := endpoint.buildHTTPRequest()
+	if request.Method != "GET" {
+		t.Error("request.Method should've been GET, but was", request.Method)
+	}
+	if request.Host != "twin.sh" {
+		t.Error("request.Host should've been twin.sh, but was", request.Host)
+	}
+	if userAgent := request.Header.Get("User-Agent"); userAgent != "Test/2.0" {
+		t.Errorf("request.Header.Get(User-Agent) should've been %s, but was %s", "Test/2.0", userAgent)
+	}
+}
+
+func TestEndpoint_buildHTTPRequestWithHostHeader(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	endpoint := Endpoint{
+		Name:       "website-health",
+		URL:        "https://twin.sh/health",
+		Method:     "POST",
+		Conditions: []Condition{condition},
+		Headers: map[string]string{
+			"Host": "example.com",
+		},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	request := endpoint.buildHTTPRequest()
+	if request.Method != "POST" {
+		t.Error("request.Method should've been POST, but was", request.Method)
+	}
+	if request.Host != "example.com" {
+		t.Error("request.Host should've been example.com, but was", request.Host)
+	}
+}
+
+func TestEndpoint_buildHTTPRequestWithGraphQLEnabled(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	endpoint := Endpoint{
+		Name:       "website-graphql",
+		URL:        "https://twin.sh/graphql",
+		Method:     "POST",
+		Conditions: []Condition{condition},
+		GraphQL:    true,
+		Body: `{
+  users(gender: "female") {
+    id
+    name
+    gender
+    avatar
+  }
+}`,
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	request := endpoint.buildHTTPRequest()
+	if request.Method != "POST" {
+		t.Error("request.Method should've been POST, but was", request.Method)
+	}
+	if contentType := request.Header.Get(ContentTypeHeader); contentType != "application/json" {
+		t.Error("request.Header.Content-Type should've been application/json, but was", contentType)
+	}
+	body, _ := io.ReadAll(request.Body)
+	if !strings.HasPrefix(string(body), "{\"query\":") {
+		t.Error("request.body should've started with '{\"query\":', but it didn't:", string(body))
+	}
+}
+
+func TestIntegrationEvaluateHealth(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	bodyCondition := Condition("[BODY].status == UP")
+	endpoint := Endpoint{
+		Name:       "website-health",
+		URL:        "https://twin.sh/health",
+		Conditions: []Condition{condition, bodyCondition},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	result := endpoint.EvaluateHealth()
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Condition '%s' should have been a success", condition)
+	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
+	if !result.Success {
+		t.Error("Because all conditions passed, this should have been a success")
+	}
+	if result.Hostname != "twin.sh" {
+		t.Error("result.Hostname should've been twin.sh, but was", result.Hostname)
+	}
+}
+
+func TestIntegrationEvaluateHealthWithErrorAndHideURL(t *testing.T) {
+	endpoint := Endpoint{
+		Name:       "invalid-url",
+		URL:        "https://httpstat.us/200?sleep=100",
+		Conditions: []Condition{Condition("[STATUS] == 200")},
+		ClientConfig: &client.Config{
+			Timeout: 1 * time.Millisecond,
+		},
+		UIConfig: &ui.Config{
+			HideURL: true,
+		},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	result := endpoint.EvaluateHealth()
+	if result.Success {
+		t.Error("Because one of the conditions was invalid, result.Success should have been false")
+	}
+	if len(result.Errors) == 0 {
+		t.Error("There should've been an error")
+	}
+	if !strings.Contains(result.Errors[0], "<redacted>") || strings.Contains(result.Errors[0], endpoint.URL) {
+		t.Error("result.Errors[0] should've had the URL redacted because ui.hide-url is set to true")
+	}
+}
+
+func TestIntegrationEvaluateHealthForDNS(t *testing.T) {
+	conditionSuccess := Condition("[DNS_RCODE] == NOERROR")
+	conditionBody := Condition("[BODY] == pat(*.*.*.*)")
+	endpoint := Endpoint{
+		Name: "example",
+		URL:  "8.8.8.8",
+		DNSConfig: &dns.Config{
+			QueryType: "A",
+			QueryName: "example.com.",
+		},
+		Conditions: []Condition{conditionSuccess, conditionBody},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	result := endpoint.EvaluateHealth()
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Conditions '%s' and '%s' should have been a success", conditionSuccess, conditionBody)
+	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
+	if !result.Success {
+		t.Error("Because all conditions passed, this should have been a success")
+	}
+}
+
+func TestIntegrationEvaluateHealthForSSH(t *testing.T) {
+	scenarios := []struct {
+		name       string
+		endpoint   Endpoint
+		conditions []Condition
+		success    bool
+	}{
+		{
+			name: "ssh-success",
+			endpoint: Endpoint{
+				Name: "ssh-success",
+				URL:  "ssh://localhost",
+				SSHConfig: &ssh.Config{
+					Username: "scenario",
+					Password: "scenario",
+				},
+				Body: "{ \"command\": \"uptime\" }",
+			},
+			conditions: []Condition{Condition("[STATUS] == 0")},
+			success:    true,
+		},
+		{
+			name: "ssh-failure",
+			endpoint: Endpoint{
+				Name: "ssh-failure",
+				URL:  "ssh://localhost",
+				SSHConfig: &ssh.Config{
+					Username: "scenario",
+					Password: "scenario",
+				},
+				Body: "{ \"command\": \"uptime\" }",
+			},
+			conditions: []Condition{Condition("[STATUS] == 1")},
+			success:    false,
+		},
+	}
+
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			scenario.endpoint.ValidateAndSetDefaults()
+			scenario.endpoint.Conditions = scenario.conditions
+			result := scenario.endpoint.EvaluateHealth()
+			if result.Success != scenario.success {
+				t.Errorf("Expected success to be %v, but was %v", scenario.success, result.Success)
+			}
+		})
+	}
+}
+
+func TestIntegrationEvaluateHealthForICMP(t *testing.T) {
+	endpoint := Endpoint{
+		Name:       "icmp-test",
+		URL:        "icmp://127.0.0.1",
+		Conditions: []Condition{"[CONNECTED] == true"},
+	}
+	err := endpoint.ValidateAndSetDefaults()
+	if err != nil {
+		t.Fatal("did not expect an error, got", err)
+	}
+	result := endpoint.EvaluateHealth()
+	if !result.ConditionResults[0].Success {
+		t.Errorf("Conditions '%s' should have been a success", endpoint.Conditions[0])
+	}
+	if !result.Connected {
+		t.Error("Because the connection has been established, result.Connected should've been true")
+	}
+	if !result.Success {
+		t.Error("Because all conditions passed, this should have been a success")
+	}
+}
+
+func TestEndpoint_DisplayName(t *testing.T) {
+	if endpoint := (Endpoint{Name: "n"}); endpoint.DisplayName() != "n" {
+		t.Error("endpoint.DisplayName() should've been 'n', but was", endpoint.DisplayName())
+	}
+	if endpoint := (Endpoint{Group: "g", Name: "n"}); endpoint.DisplayName() != "g/n" {
+		t.Error("endpoint.DisplayName() should've been 'g/n', but was", endpoint.DisplayName())
+	}
+}
+
+func TestEndpoint_getIP(t *testing.T) {
+	endpoint := Endpoint{
+		Name:       "invalid-url-test",
+		URL:        "",
+		Conditions: []Condition{"[CONNECTED] == true"},
+	}
+	result := &Result{}
+	endpoint.getIP(result)
+	if len(result.Errors) == 0 {
+		t.Error("endpoint.getIP(result) should've thrown an error because the URL is invalid, thus cannot be parsed")
+	}
+}
+
+func TestEndpoint_needsToReadBody(t *testing.T) {
+	statusCondition := Condition("[STATUS] == 200")
+	bodyCondition := Condition("[BODY].status == UP")
+	bodyConditionWithLength := Condition("len([BODY].tags) > 0")
+	if (&Endpoint{Conditions: []Condition{statusCondition}}).needsToReadBody() {
+		t.Error("expected false, got true")
+	}
+	if !(&Endpoint{Conditions: []Condition{bodyCondition}}).needsToReadBody() {
+		t.Error("expected true, got false")
+	}
+	if !(&Endpoint{Conditions: []Condition{bodyConditionWithLength}}).needsToReadBody() {
+		t.Error("expected true, got false")
+	}
+	if !(&Endpoint{Conditions: []Condition{statusCondition, bodyCondition}}).needsToReadBody() {
+		t.Error("expected true, got false")
+	}
+	if !(&Endpoint{Conditions: []Condition{bodyCondition, statusCondition}}).needsToReadBody() {
+		t.Error("expected true, got false")
+	}
+	if !(&Endpoint{Conditions: []Condition{bodyConditionWithLength, statusCondition}}).needsToReadBody() {
+		t.Error("expected true, got false")
+	}
+}
+
+func TestEndpoint_needsToRetrieveDomainExpiration(t *testing.T) {
+	if (&Endpoint{Conditions: []Condition{"[STATUS] == 200"}}).needsToRetrieveDomainExpiration() {
+		t.Error("expected false, got true")
+	}
+	if !(&Endpoint{Conditions: []Condition{"[STATUS] == 200", "[DOMAIN_EXPIRATION] < 720h"}}).needsToRetrieveDomainExpiration() {
+		t.Error("expected true, got false")
+	}
+}
+
+func TestEndpoint_needsToRetrieveIP(t *testing.T) {
+	if (&Endpoint{Conditions: []Condition{"[STATUS] == 200"}}).needsToRetrieveIP() {
+		t.Error("expected false, got true")
+	}
+	if !(&Endpoint{Conditions: []Condition{"[STATUS] == 200", "[IP] == 127.0.0.1"}}).needsToRetrieveIP() {
+		t.Error("expected true, got false")
+	}
+}

config/endpoint/event.go

@@ -0,0 +1,39 @@
+package endpoint
+
+import (
+	"time"
+)
+
+// Event is something that happens at a specific time
+type Event struct {
+	// Type is the kind of event
+	Type EventType `json:"type"`
+
+	// Timestamp is the moment at which the event happened
+	Timestamp time.Time `json:"timestamp"`
+}
+
+// EventType is, uh, the types of events?
+type EventType string
+
+var (
+	// EventStart is a type of event that represents when an endpoint starts being monitored
+	EventStart EventType = "START"
+
+	// EventHealthy is a type of event that represents an endpoint passing all of its conditions
+	EventHealthy EventType = "HEALTHY"
+
+	// EventUnhealthy is a type of event that represents an endpoint failing one or more of its conditions
+	EventUnhealthy EventType = "UNHEALTHY"
+)
+
+// NewEventFromResult creates an Event from a Result
+func NewEventFromResult(result *Result) *Event {
+	event := &Event{Timestamp: result.Timestamp}
+	if result.Success {
+		event.Type = EventHealthy
+	} else {
+		event.Type = EventUnhealthy
+	}
+	return event
+}

config/endpoint/event_test.go

@@ -0,0 +1,14 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func TestNewEventFromResult(t *testing.T) {
+	if event := NewEventFromResult(&Result{Success: true}); event.Type != EventHealthy {
+		t.Error("expected event.Type to be EventHealthy")
+	}
+	if event := NewEventFromResult(&Result{Success: false}); event.Type != EventUnhealthy {
+		t.Error("expected event.Type to be EventUnhealthy")
+	}
+}

config/endpoint/external_endpoint.go

@@ -0,0 +1,83 @@
+package endpoint
+
+import (
+	"errors"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+)
+
+var (
+	// ErrExternalEndpointWithNoToken is the error with which Gatus will panic if an external endpoint is configured without a token.
+	ErrExternalEndpointWithNoToken = errors.New("you must specify a token for each external endpoint")
+)
+
+// ExternalEndpoint is an endpoint whose result is pushed from outside Gatus, which means that
+// said endpoints are not monitored by Gatus itself; Gatus only displays their results and takes
+// care of alerting
+type ExternalEndpoint struct {
+	// Enabled defines whether to enable the monitoring of the endpoint
+	Enabled *bool `yaml:"enabled,omitempty"`
+
+	// Name of the endpoint. Can be anything.
+	Name string `yaml:"name"`
+
+	// Group the endpoint is a part of. Used for grouping multiple endpoints together on the front end.
+	Group string `yaml:"group,omitempty"`
+
+	// Token is the bearer token that must be provided through the Authorization header to push results to the endpoint
+	Token string `yaml:"token,omitempty"`
+
+	// Alerts is the alerting configuration for the endpoint in case of failure
+	Alerts []*alert.Alert `yaml:"alerts,omitempty"`
+
+	// NumberOfFailuresInARow is the number of unsuccessful evaluations in a row
+	NumberOfFailuresInARow int `yaml:"-"`
+
+	// NumberOfSuccessesInARow is the number of successful evaluations in a row
+	NumberOfSuccessesInARow int `yaml:"-"`
+}
+
+// ValidateAndSetDefaults validates the ExternalEndpoint and sets the default values
+func (externalEndpoint *ExternalEndpoint) ValidateAndSetDefaults() error {
+	if err := validateEndpointNameGroupAndAlerts(externalEndpoint.Name, externalEndpoint.Group, externalEndpoint.Alerts); err != nil {
+		return err
+	}
+	if len(externalEndpoint.Token) == 0 {
+		return ErrExternalEndpointWithNoToken
+	}
+	return nil
+}
+
+// IsEnabled returns whether the endpoint is enabled or not
+func (externalEndpoint *ExternalEndpoint) IsEnabled() bool {
+	if externalEndpoint.Enabled == nil {
+		return true
+	}
+	return *externalEndpoint.Enabled
+}
+
+// DisplayName returns an identifier made up of the Name and, if not empty, the Group.
+func (externalEndpoint *ExternalEndpoint) DisplayName() string {
+	if len(externalEndpoint.Group) > 0 {
+		return externalEndpoint.Group + "/" + externalEndpoint.Name
+	}
+	return externalEndpoint.Name
+}
+
+// Key returns the unique key for the Endpoint
+func (externalEndpoint *ExternalEndpoint) Key() string {
+	return ConvertGroupAndEndpointNameToKey(externalEndpoint.Group, externalEndpoint.Name)
+}
+
+// ToEndpoint converts the ExternalEndpoint to an Endpoint
+func (externalEndpoint *ExternalEndpoint) ToEndpoint() *Endpoint {
+	endpoint := &Endpoint{
+		Enabled:                 externalEndpoint.Enabled,
+		Name:                    externalEndpoint.Name,
+		Group:                   externalEndpoint.Group,
+		Alerts:                  externalEndpoint.Alerts,
+		NumberOfFailuresInARow:  externalEndpoint.NumberOfFailuresInARow,
+		NumberOfSuccessesInARow: externalEndpoint.NumberOfSuccessesInARow,
+	}
+	return endpoint
+}

config/endpoint/external_endpoint_test.go

@@ -0,0 +1,25 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func TestExternalEndpoint_ToEndpoint(t *testing.T) {
+	externalEndpoint := &ExternalEndpoint{
+		Name:  "name",
+		Group: "group",
+	}
+	convertedEndpoint := externalEndpoint.ToEndpoint()
+	if externalEndpoint.Name != convertedEndpoint.Name {
+		t.Errorf("expected %s, got %s", externalEndpoint.Name, convertedEndpoint.Name)
+	}
+	if externalEndpoint.Group != convertedEndpoint.Group {
+		t.Errorf("expected %s, got %s", externalEndpoint.Group, convertedEndpoint.Group)
+	}
+	if externalEndpoint.Key() != convertedEndpoint.Key() {
+		t.Errorf("expected %s, got %s", externalEndpoint.Key(), convertedEndpoint.Key())
+	}
+	if externalEndpoint.DisplayName() != convertedEndpoint.DisplayName() {
+		t.Errorf("expected %s, got %s", externalEndpoint.DisplayName(), convertedEndpoint.DisplayName())
+	}
+}

config/endpoint/key.go

@@ -0,0 +1,19 @@
+package endpoint
+
+import "strings"
+
+// ConvertGroupAndEndpointNameToKey converts a group and an endpoint to a key
+func ConvertGroupAndEndpointNameToKey(groupName, endpointName string) string {
+	return sanitize(groupName) + "_" + sanitize(endpointName)
+}
+
+func sanitize(s string) string {
+	s = strings.TrimSpace(strings.ToLower(s))
+	s = strings.ReplaceAll(s, "/", "-")
+	s = strings.ReplaceAll(s, "_", "-")
+	s = strings.ReplaceAll(s, ".", "-")
+	s = strings.ReplaceAll(s, ",", "-")
+	s = strings.ReplaceAll(s, " ", "-")
+	s = strings.ReplaceAll(s, "#", "-")
+	return s
+}

config/endpoint/key_bench_test.go

@@ -0,0 +1,11 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func BenchmarkConvertGroupAndEndpointNameToKey(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		ConvertGroupAndEndpointNameToKey("group", "name")
+	}
+}

config/endpoint/key_test.go

@@ -0,0 +1,36 @@
+package endpoint
+
+import "testing"
+
+func TestConvertGroupAndEndpointNameToKey(t *testing.T) {
+	type Scenario struct {
+		GroupName      string
+		EndpointName   string
+		ExpectedOutput string
+	}
+	scenarios := []Scenario{
+		{
+			GroupName:      "Core",
+			EndpointName:   "Front End",
+			ExpectedOutput: "core_front-end",
+		},
+		{
+			GroupName:      "Load balancers",
+			EndpointName:   "us-west-2",
+			ExpectedOutput: "load-balancers_us-west-2",
+		},
+		{
+			GroupName:      "a/b test",
+			EndpointName:   "a",
+			ExpectedOutput: "a-b-test_a",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.ExpectedOutput, func(t *testing.T) {
+			output := ConvertGroupAndEndpointNameToKey(scenario.GroupName, scenario.EndpointName)
+			if output != scenario.ExpectedOutput {
+				t.Errorf("expected '%s', got '%s'", scenario.ExpectedOutput, output)
+			}
+		})
+	}
+}

config/endpoint/result.go

@@ -0,0 +1,69 @@
+package endpoint
+
+import (
+	"time"
+)
+
+// Result of the evaluation of a Endpoint
+type Result struct {
+	// HTTPStatus is the HTTP response status code
+	HTTPStatus int `json:"status,omitempty"`
+
+	// DNSRCode is the response code of a DNS query in a human-readable format
+	//
+	// Possible values: NOERROR, FORMERR, SERVFAIL, NXDOMAIN, NOTIMP, REFUSED
+	DNSRCode string `json:"-"`
+
+	// Hostname extracted from Endpoint.URL
+	Hostname string `json:"hostname,omitempty"`
+
+	// IP resolved from the Endpoint URL
+	IP string `json:"-"`
+
+	// Connected whether a connection to the host was established successfully
+	Connected bool `json:"-"`
+
+	// Duration time that the request took
+	Duration time.Duration `json:"duration"`
+
+	// Errors encountered during the evaluation of the Endpoint's health
+	Errors []string `json:"errors,omitempty"`
+
+	// ConditionResults are the results of each of the Endpoint's Condition
+	ConditionResults []*ConditionResult `json:"conditionResults,omitempty"`
+
+	// Success whether the result signifies a success or not
+	Success bool `json:"success"`
+
+	// Timestamp when the request was sent
+	Timestamp time.Time `json:"timestamp"`
+
+	// CertificateExpiration is the duration before the certificate expires
+	CertificateExpiration time.Duration `json:"-"`
+
+	// DomainExpiration is the duration before the domain expires
+	DomainExpiration time.Duration `json:"-"`
+
+	// Body is the response body
+	//
+	// Note that this field is not persisted in the storage.
+	// It is used for health evaluation as well as debugging purposes.
+	Body []byte `json:"-"`
+
+	///////////////////////////////////////////////////////////////////////
+	// Below is used only for the UI and is not persisted in the storage //
+	///////////////////////////////////////////////////////////////////////
+	port string `yaml:"-"` // used for endpoints[].ui.hide-port
+}
+
+// AddError adds an error to the result's list of errors.
+// It also ensures that there are no duplicates.
+func (r *Result) AddError(error string) {
+	for _, resultError := range r.Errors {
+		if resultError == error {
+			// If the error already exists, don't add it
+			return
+		}
+	}
+	r.Errors = append(r.Errors, error)
+}

config/endpoint/result_test.go

@@ -0,0 +1,21 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func TestResult_AddError(t *testing.T) {
+	result := &Result{}
+	result.AddError("potato")
+	if len(result.Errors) != 1 {
+		t.Error("should've had 1 error")
+	}
+	result.AddError("potato")
+	if len(result.Errors) != 1 {
+		t.Error("should've still had 1 error, because a duplicate error was added")
+	}
+	result.AddError("tomato")
+	if len(result.Errors) != 2 {
+		t.Error("should've had 2 error")
+	}
+}

config/endpoint/ssh/ssh.go

@@ -0,0 +1,33 @@
+package ssh
+
+import (
+	"errors"
+)
+
+var (
+	// ErrEndpointWithoutSSHUsername is the error with which Gatus will panic if an endpoint with SSH monitoring is configured without a user.
+	ErrEndpointWithoutSSHUsername = errors.New("you must specify a username for each SSH endpoint")
+
+	// ErrEndpointWithoutSSHPassword is the error with which Gatus will panic if an endpoint with SSH monitoring is configured without a password.
+	ErrEndpointWithoutSSHPassword = errors.New("you must specify a password for each SSH endpoint")
+)
+
+type Config struct {
+	Username string `yaml:"username,omitempty"`
+	Password string `yaml:"password,omitempty"`
+}
+
+// Validate the SSH configuration
+func (cfg *Config) Validate() error {
+	// If there's no username and password, this endpoint can still check the SSH banner, so the endpoint is still valid
+	if len(cfg.Username) == 0 && len(cfg.Password) == 0 {
+		return nil
+	}
+	if len(cfg.Username) == 0 {
+		return ErrEndpointWithoutSSHUsername
+	}
+	if len(cfg.Password) == 0 {
+		return ErrEndpointWithoutSSHPassword
+	}
+	return nil
+}

config/endpoint/ssh/ssh_test.go

@@ -0,0 +1,23 @@
+package ssh
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestSSH_validate(t *testing.T) {
+	cfg := &Config{}
+	if err := cfg.Validate(); err != nil {
+		t.Error("didn't expect an error")
+	}
+	cfg.Username = "username"
+	if err := cfg.Validate(); err == nil {
+		t.Error("expected an error")
+	} else if !errors.Is(err, ErrEndpointWithoutSSHPassword) {
+		t.Errorf("expected error to be '%v', got '%v'", ErrEndpointWithoutSSHPassword, err)
+	}
+	cfg.Password = "password"
+	if err := cfg.Validate(); err != nil {
+		t.Errorf("expected no error, got '%v'", err)
+	}
+}

config/endpoint/status.go

@@ -0,0 +1,38 @@
+package endpoint
+
+// Status contains the evaluation Results of an Endpoint
+type Status struct {
+	// Name of the endpoint
+	Name string `json:"name,omitempty"`
+
+	// Group the endpoint is a part of. Used for grouping multiple endpoints together on the front end.
+	Group string `json:"group,omitempty"`
+
+	// Key of the Endpoint
+	Key string `json:"key"`
+
+	// Results is the list of endpoint evaluation results
+	Results []*Result `json:"results"`
+
+	// Events is a list of events
+	Events []*Event `json:"events,omitempty"`
+
+	// Uptime information on the endpoint's uptime
+	//
+	// Used by the memory store.
+	//
+	// To retrieve the uptime between two time, use store.GetUptimeByKey.
+	Uptime *Uptime `json:"-"`
+}
+
+// NewStatus creates a new Status
+func NewStatus(group, name string) *Status {
+	return &Status{
+		Name:    name,
+		Group:   group,
+		Key:     ConvertGroupAndEndpointNameToKey(group, name),
+		Results: make([]*Result, 0),
+		Events:  make([]*Event, 0),
+		Uptime:  NewUptime(),
+	}
+}

config/endpoint/status_test.go

@@ -0,0 +1,19 @@
+package endpoint
+
+import (
+	"testing"
+)
+
+func TestNewEndpointStatus(t *testing.T) {
+	ep := &Endpoint{Name: "name", Group: "group"}
+	status := NewStatus(ep.Group, ep.Name)
+	if status.Name != ep.Name {
+		t.Errorf("expected %s, got %s", ep.Name, status.Name)
+	}
+	if status.Group != ep.Group {
+		t.Errorf("expected %s, got %s", ep.Group, status.Group)
+	}
+	if status.Key != "group_name" {
+		t.Errorf("expected %s, got %s", "group_name", status.Key)
+	}
+}

config/endpoint/ui/ui.go

@@ -0,0 +1,69 @@
+package ui
+
+import "errors"
+
+// Config is the UI configuration for endpoint.Endpoint
+type Config struct {
+	// HideConditions whether to hide the condition results on the UI
+	HideConditions bool `yaml:"hide-conditions"`
+
+	// HideHostname whether to hide the hostname in the Result
+	HideHostname bool `yaml:"hide-hostname"`
+
+	// HideURL whether to ensure the URL is not displayed in the results. Useful if the URL contains a token.
+	HideURL bool `yaml:"hide-url"`
+
+	// HidePort whether to hide the port in the Result
+	HidePort bool `yaml:"hide-port"`
+
+	// DontResolveFailedConditions whether to resolve failed conditions in the Result for display in the UI
+	DontResolveFailedConditions bool `yaml:"dont-resolve-failed-conditions"`
+
+	// Badge is the configuration for the badges generated
+	Badge *Badge `yaml:"badge"`
+}
+
+type Badge struct {
+	ResponseTime *ResponseTime `yaml:"response-time"`
+}
+
+type ResponseTime struct {
+	Thresholds []int `yaml:"thresholds"`
+}
+
+var (
+	ErrInvalidBadgeResponseTimeConfig = errors.New("invalid response time badge configuration: expected parameter 'response-time' to have 5 ascending numerical values")
+)
+
+// ValidateAndSetDefaults validates the UI configuration and sets the default values
+func (config *Config) ValidateAndSetDefaults() error {
+	if config.Badge != nil {
+		if len(config.Badge.ResponseTime.Thresholds) != 5 {
+			return ErrInvalidBadgeResponseTimeConfig
+		}
+		for i := 4; i > 0; i-- {
+			if config.Badge.ResponseTime.Thresholds[i] < config.Badge.ResponseTime.Thresholds[i-1] {
+				return ErrInvalidBadgeResponseTimeConfig
+			}
+		}
+	} else {
+		config.Badge = GetDefaultConfig().Badge
+	}
+	return nil
+}
+
+// GetDefaultConfig retrieves the default UI configuration
+func GetDefaultConfig() *Config {
+	return &Config{
+		HideHostname:                false,
+		HideURL:                     false,
+		HidePort:                    false,
+		DontResolveFailedConditions: false,
+		HideConditions:              false,
+		Badge: &Badge{
+			ResponseTime: &ResponseTime{
+				Thresholds: []int{50, 200, 300, 500, 750},
+			},
+		},
+	}
+}

config/endpoint/ui/ui_test.go

@@ -0,0 +1,53 @@
+package ui
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestValidateAndSetDefaults(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr error
+	}{
+		{
+			name: "with-valid-config",
+			config: &Config{
+				Badge: &Badge{
+					ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 300, 500, 750}},
+				},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "with-invalid-threshold-length",
+			config: &Config{
+				Badge: &Badge{
+					ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 300, 500}},
+				},
+			},
+			wantErr: ErrInvalidBadgeResponseTimeConfig,
+		},
+		{
+			name: "with-invalid-thresholds-order",
+			config: &Config{
+				Badge: &Badge{ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 500, 300, 750}}},
+			},
+			wantErr: ErrInvalidBadgeResponseTimeConfig,
+		},
+		{
+			name:    "with-no-badge-configured", // should give default badge cfg
+			config:  &Config{},
+			wantErr: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.config.ValidateAndSetDefaults(); !errors.Is(err, tt.wantErr) {
+				t.Errorf("Expected error %v, got %v", tt.wantErr, err)
+			}
+		})
+	}
+}

config/endpoint/uptime.go

@@ -0,0 +1,24 @@
+package endpoint
+
+// Uptime is the struct that contains the relevant data for calculating the uptime as well as the uptime itself
+// and some other statistics
+type Uptime struct {
+	// HourlyStatistics is a map containing metrics collected (value) for every hourly unix timestamps (key)
+	//
+	// Used only if the storage type is memory
+	HourlyStatistics map[int64]*HourlyUptimeStatistics `json:"-"`
+}
+
+// HourlyUptimeStatistics is a struct containing all metrics collected over the course of an hour
+type HourlyUptimeStatistics struct {
+	TotalExecutions             uint64 // Total number of checks
+	SuccessfulExecutions        uint64 // Number of successful executions
+	TotalExecutionsResponseTime uint64 // Total response time for all executions in milliseconds
+}
+
+// NewUptime creates a new Uptime
+func NewUptime() *Uptime {
+	return &Uptime{
+		HourlyStatistics: make(map[int64]*HourlyUptimeStatistics),
+	}
+}