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228
alerting/provider/awsses/awsses.go
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228
alerting/provider/awsses/awsses.go
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package awsses
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import (
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"errors"
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"fmt"
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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/config/endpoint"
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"github.com/TwiN/logr"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/ses"
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"gopkg.in/yaml.v3"
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)
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const (
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CharSet = "UTF-8"
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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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ErrInvalidAWSAuthConfig = errors.New("either both or neither of access-key-id and secret-access-key must be specified")
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)
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type Config struct {
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AccessKeyID string `yaml:"access-key-id"`
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SecretAccessKey string `yaml:"secret-access-key"`
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Region string `yaml:"region"`
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From string `yaml:"from"`
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To string `yaml:"to"`
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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 !((len(cfg.AccessKeyID) == 0 && len(cfg.SecretAccessKey) == 0) || (len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0)) {
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// if both AccessKeyID and SecretAccessKey are specified, we'll use these to authenticate,
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// otherwise if neither are specified, then we'll fall back on IAM authentication.
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return ErrInvalidAWSAuthConfig
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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 len(override.AccessKeyID) > 0 {
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cfg.AccessKeyID = override.AccessKeyID
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}
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if len(override.SecretAccessKey) > 0 {
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cfg.SecretAccessKey = override.SecretAccessKey
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}
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if len(override.Region) > 0 {
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cfg.Region = override.Region
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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.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 AWS Simple Email Service
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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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awsSession, err := provider.createSession(cfg)
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if err != nil {
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return err
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}
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svc := ses.New(awsSession)
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subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
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emails := strings.Split(cfg.To, ",")
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input := &ses.SendEmailInput{
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Destination: &ses.Destination{
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ToAddresses: aws.StringSlice(emails),
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},
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Message: &ses.Message{
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Body: &ses.Body{
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Text: &ses.Content{
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Charset: aws.String(CharSet),
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Data: aws.String(body),
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},
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},
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Subject: &ses.Content{
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Charset: aws.String(CharSet),
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Data: aws.String(subject),
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},
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},
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Source: aws.String(cfg.From),
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}
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if _, err = svc.SendEmail(input); err != nil {
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if aerr, ok := err.(awserr.Error); ok {
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switch aerr.Code() {
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case ses.ErrCodeMessageRejected:
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logr.Error(ses.ErrCodeMessageRejected + ": " + aerr.Error())
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case ses.ErrCodeMailFromDomainNotVerifiedException:
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logr.Error(ses.ErrCodeMailFromDomainNotVerifiedException + ": " + aerr.Error())
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case ses.ErrCodeConfigurationSetDoesNotExistException:
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logr.Error(ses.ErrCodeConfigurationSetDoesNotExistException + ": " + aerr.Error())
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default:
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logr.Error(aerr.Error())
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}
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} else {
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// Print the error, cast err to awserr.Error to get the Code and
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// Message from an error.
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logr.Error(err.Error())
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}
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return err
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}
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return nil
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}
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func (provider *AlertProvider) createSession(cfg *Config) (*session.Session, error) {
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awsConfig := &aws.Config{
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Region: aws.String(cfg.Region),
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}
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if len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0 {
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awsConfig.Credentials = credentials.NewStaticCredentials(cfg.AccessKeyID, cfg.SecretAccessKey, "")
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}
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return session.NewSession(awsConfig)
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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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