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This commit is contained in:
206
alerting/provider/email/email.go
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206
alerting/provider/email/email.go
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@ -0,0 +1,206 @@
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package email
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import (
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"crypto/tls"
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"errors"
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"fmt"
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"math"
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"strings"
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"github.com/TwiN/gatus/v5/alerting/alert"
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"github.com/TwiN/gatus/v5/client"
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"github.com/TwiN/gatus/v5/config/endpoint"
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gomail "gopkg.in/mail.v2"
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"gopkg.in/yaml.v3"
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)
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var (
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ErrDuplicateGroupOverride = errors.New("duplicate group override")
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ErrMissingFromOrToFields = errors.New("from and to fields are required")
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ErrInvalidPort = errors.New("port must be between 1 and 65535 inclusively")
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ErrMissingHost = errors.New("host is required")
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)
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type Config struct {
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From string `yaml:"from"`
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Username string `yaml:"username"`
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Password string `yaml:"password"`
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Host string `yaml:"host"`
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Port int `yaml:"port"`
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To string `yaml:"to"`
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// ClientConfig is the configuration of the client used to communicate with the provider's target
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ClientConfig *client.Config `yaml:"client,omitempty"`
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}
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func (cfg *Config) Validate() error {
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if len(cfg.From) == 0 || len(cfg.To) == 0 {
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return ErrMissingFromOrToFields
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}
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if cfg.Port < 1 || cfg.Port > math.MaxUint16 {
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return ErrInvalidPort
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}
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if len(cfg.Host) == 0 {
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return ErrMissingHost
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}
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return nil
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}
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func (cfg *Config) Merge(override *Config) {
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if override.ClientConfig != nil {
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cfg.ClientConfig = override.ClientConfig
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}
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if len(override.From) > 0 {
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cfg.From = override.From
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}
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if len(override.Username) > 0 {
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cfg.Username = override.Username
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}
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if len(override.Password) > 0 {
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cfg.Password = override.Password
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}
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if len(override.Host) > 0 {
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cfg.Host = override.Host
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}
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if override.Port > 0 {
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cfg.Port = override.Port
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}
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if len(override.To) > 0 {
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cfg.To = override.To
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}
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}
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// AlertProvider is the configuration necessary for sending an alert using SMTP
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type AlertProvider struct {
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DefaultConfig Config `yaml:",inline"`
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// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
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DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
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// Overrides is a list of Override that may be prioritized over the default configuration
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Overrides []Override `yaml:"overrides,omitempty"`
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}
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// Override is a case under which the default integration is overridden
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type Override struct {
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Group string `yaml:"group"`
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Config `yaml:",inline"`
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}
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// Validate the provider's configuration
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func (provider *AlertProvider) Validate() error {
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registeredGroups := make(map[string]bool)
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if provider.Overrides != nil {
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for _, override := range provider.Overrides {
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if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.To) == 0 {
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return ErrDuplicateGroupOverride
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}
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registeredGroups[override.Group] = true
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}
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}
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return provider.DefaultConfig.Validate()
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}
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// Send an alert using the provider
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func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
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cfg, err := provider.GetConfig(ep.Group, alert)
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if err != nil {
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return err
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}
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var username string
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if len(cfg.Username) > 0 {
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username = cfg.Username
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} else {
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username = cfg.From
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}
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subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
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m := gomail.NewMessage()
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m.SetHeader("From", cfg.From)
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m.SetHeader("To", strings.Split(cfg.To, ",")...)
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m.SetHeader("Subject", subject)
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m.SetBody("text/plain", body)
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var d *gomail.Dialer
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if len(cfg.Password) == 0 {
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// Get the domain in the From address
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localName := "localhost"
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fromParts := strings.Split(cfg.From, `@`)
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if len(fromParts) == 2 {
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localName = fromParts[1]
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}
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// Create a dialer with no authentication
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d = &gomail.Dialer{Host: cfg.Host, Port: cfg.Port, LocalName: localName}
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} else {
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// Create an authenticated dialer
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d = gomail.NewDialer(cfg.Host, cfg.Port, username, cfg.Password)
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}
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if cfg.ClientConfig != nil && cfg.ClientConfig.Insecure {
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d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
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}
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return d.DialAndSend(m)
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}
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// buildMessageSubjectAndBody builds the message subject and body
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func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) (string, string) {
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var subject, message string
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if resolved {
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subject = fmt.Sprintf("[%s] Alert resolved", ep.DisplayName())
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message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
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} else {
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subject = fmt.Sprintf("[%s] Alert triggered", ep.DisplayName())
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message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
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}
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var formattedConditionResults string
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if len(result.ConditionResults) > 0 {
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formattedConditionResults = "\n\nCondition results:\n"
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for _, conditionResult := range result.ConditionResults {
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var prefix string
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if conditionResult.Success {
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prefix = "✅"
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} else {
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prefix = "❌"
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}
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formattedConditionResults += fmt.Sprintf("%s %s\n", prefix, conditionResult.Condition)
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}
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}
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var description string
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if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
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description = "\n\nAlert description: " + alertDescription
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}
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return subject, message + description + formattedConditionResults
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}
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// GetDefaultAlert returns the provider's default alert configuration
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func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
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return provider.DefaultAlert
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}
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// GetConfig returns the configuration for the provider with the overrides applied
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func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
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cfg := provider.DefaultConfig
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// Handle group overrides
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if provider.Overrides != nil {
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for _, override := range provider.Overrides {
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if group == override.Group {
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cfg.Merge(&override.Config)
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break
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}
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}
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}
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// Handle alert overrides
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if len(alert.ProviderOverride) != 0 {
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overrideConfig := Config{}
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if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
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return nil, err
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}
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cfg.Merge(&overrideConfig)
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}
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// Validate the configuration
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err := cfg.Validate()
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return &cfg, err
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}
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// ValidateOverrides validates the alert's provider override and, if present, the group override
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func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
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_, err := provider.GetConfig(group, alert)
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return err
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}
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232
alerting/provider/email/email_test.go
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232
alerting/provider/email/email_test.go
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@ -0,0 +1,232 @@
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package email
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import (
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"testing"
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"github.com/TwiN/gatus/v5/alerting/alert"
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"github.com/TwiN/gatus/v5/config/endpoint"
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)
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func TestAlertProvider_Validate(t *testing.T) {
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invalidProvider := AlertProvider{}
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if err := invalidProvider.Validate(); err == nil {
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t.Error("provider shouldn't have been valid")
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}
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validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Password: "password", Host: "smtp.gmail.com", Port: 587, To: "to@example.com"}}
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if err := validProvider.Validate(); err != nil {
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t.Error("provider should've been valid")
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}
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}
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func TestAlertProvider_ValidateWithNoCredentials(t *testing.T) {
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validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Host: "smtp-relay.gmail.com", Port: 587, To: "to@example.com"}}
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if err := validProvider.Validate(); err != nil {
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t.Error("provider should've been valid")
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}
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}
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func TestAlertProvider_ValidateWithOverride(t *testing.T) {
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providerWithInvalidOverrideGroup := AlertProvider{
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Overrides: []Override{
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{
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Config: Config{To: "to@example.com"},
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Group: "",
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},
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},
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}
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if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
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t.Error("provider Group shouldn't have been valid")
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}
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providerWithInvalidOverrideTo := AlertProvider{
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Overrides: []Override{
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{
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Config: Config{To: ""},
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Group: "group",
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},
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},
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}
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if err := providerWithInvalidOverrideTo.Validate(); err == nil {
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t.Error("provider integration key shouldn't have been valid")
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}
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providerWithValidOverride := AlertProvider{
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DefaultConfig: Config{
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From: "from@example.com",
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Password: "password",
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Host: "smtp.gmail.com",
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Port: 587,
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To: "to@example.com",
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},
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Overrides: []Override{
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{
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Config: Config{To: "to@example.com"},
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Group: "group",
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},
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},
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}
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if err := providerWithValidOverride.Validate(); err != nil {
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t.Error("provider should've been valid")
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}
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}
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func TestAlertProvider_buildRequestBody(t *testing.T) {
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firstDescription := "description-1"
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secondDescription := "description-2"
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scenarios := []struct {
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Name string
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Provider AlertProvider
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Alert alert.Alert
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Resolved bool
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ExpectedSubject string
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ExpectedBody string
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}{
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{
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Name: "triggered",
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Provider: AlertProvider{},
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Alert: alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
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Resolved: false,
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ExpectedSubject: "[endpoint-name] Alert triggered",
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ExpectedBody: "An alert for endpoint-name has been triggered due to having failed 3 time(s) in a row\n\nAlert description: description-1\n\nCondition results:\n❌ [CONNECTED] == true\n❌ [STATUS] == 200\n",
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},
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{
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Name: "resolved",
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Provider: AlertProvider{},
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Alert: alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
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Resolved: true,
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ExpectedSubject: "[endpoint-name] Alert resolved",
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ExpectedBody: "An alert for endpoint-name has been resolved after passing successfully 5 time(s) in a row\n\nAlert description: description-2\n\nCondition results:\n✅ [CONNECTED] == true\n✅ [STATUS] == 200\n",
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},
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}
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for _, scenario := range scenarios {
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t.Run(scenario.Name, func(t *testing.T) {
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subject, body := scenario.Provider.buildMessageSubjectAndBody(
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&endpoint.Endpoint{Name: "endpoint-name"},
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&scenario.Alert,
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&endpoint.Result{
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ConditionResults: []*endpoint.ConditionResult{
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{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
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{Condition: "[STATUS] == 200", Success: scenario.Resolved},
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},
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},
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scenario.Resolved,
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)
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if subject != scenario.ExpectedSubject {
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t.Errorf("expected subject to be %s, got %s", scenario.ExpectedSubject, subject)
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}
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if body != scenario.ExpectedBody {
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t.Errorf("expected body to be %s, got %s", scenario.ExpectedBody, body)
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}
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})
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}
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}
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func TestAlertProvider_GetDefaultAlert(t *testing.T) {
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if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
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t.Error("expected default alert to be not nil")
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}
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if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
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t.Error("expected default alert to be nil")
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}
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}
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func TestAlertProvider_GetConfig(t *testing.T) {
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scenarios := []struct {
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Name string
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Provider AlertProvider
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InputGroup string
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InputAlert alert.Alert
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ExpectedOutput Config
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}{
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{
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Name: "provider-no-override-specify-no-group-should-default",
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Provider: AlertProvider{
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DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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Overrides: nil,
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},
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InputGroup: "",
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InputAlert: alert.Alert{},
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ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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},
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{
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Name: "provider-no-override-specify-group-should-default",
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Provider: AlertProvider{
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DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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Overrides: nil,
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},
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InputGroup: "group",
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InputAlert: alert.Alert{},
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ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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},
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{
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Name: "provider-with-override-specify-no-group-should-default",
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Provider: AlertProvider{
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DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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Overrides: []Override{
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{
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Group: "group",
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Config: Config{To: "to01@example.com"},
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},
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},
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},
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InputGroup: "",
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InputAlert: alert.Alert{},
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ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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},
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{
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Name: "provider-with-override-specify-group-should-override",
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Provider: AlertProvider{
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DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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Overrides: []Override{
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{
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Group: "group",
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Config: Config{To: "group-to@example.com"},
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},
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},
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},
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InputGroup: "group",
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InputAlert: alert.Alert{},
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ExpectedOutput: Config{From: "from@example.com", To: "group-to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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},
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{
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Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
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Provider: AlertProvider{
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DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
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Overrides: []Override{
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{
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Group: "group",
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Config: Config{To: "group-to@example.com"},
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},
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},
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},
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InputGroup: "group",
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InputAlert: alert.Alert{ProviderOverride: map[string]any{"to": "alert-to@example.com", "host": "smtp.example.com", "port": 588, "password": "hunter2"}},
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ExpectedOutput: Config{From: "from@example.com", To: "alert-to@example.com", Host: "smtp.example.com", Port: 588, Password: "hunter2"},
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},
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}
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for _, scenario := range scenarios {
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t.Run(scenario.Name, func(t *testing.T) {
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got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
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if err != nil {
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t.Fatalf("unexpected error: %s", err)
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}
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if got.From != scenario.ExpectedOutput.From {
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t.Errorf("expected from to be %s, got %s", scenario.ExpectedOutput.From, got.From)
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}
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if got.To != scenario.ExpectedOutput.To {
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t.Errorf("expected to be %s, got %s", scenario.ExpectedOutput.To, got.To)
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}
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if got.Host != scenario.ExpectedOutput.Host {
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t.Errorf("expected host to be %s, got %s", scenario.ExpectedOutput.Host, got.Host)
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}
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if got.Port != scenario.ExpectedOutput.Port {
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t.Errorf("expected port to be %d, got %d", scenario.ExpectedOutput.Port, got.Port)
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}
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if got.Password != scenario.ExpectedOutput.Password {
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t.Errorf("expected password to be %s, got %s", scenario.ExpectedOutput.Password, got.Password)
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}
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// Test ValidateOverrides as well, since it really just calls GetConfig
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if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
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t.Errorf("unexpected error: %s", err)
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}
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})
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}
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}
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Reference in New Issue
Block a user