feat: Added Microsoft Teams Notifier

README.md

@@ -546,6 +546,7 @@ Available notifiers are:
 - **Slack**
 - **Webhook**
 - **Discord**
+- **Microsoft Teams**
 
 ## Export data
 **GO Feature Flag** allows you to export data about the usage of your flags.    

cmd/relayproxy/config/notifier.go

@@ -20,6 +20,9 @@
 	if c.Kind == SlackNotifier && (c.SlackWebhookURL == "" && c.WebhookURL == "") {
 		return fmt.Errorf("invalid notifier: no \"slackWebhookUrl\" property found for kind \"%s\"", c.Kind)
 	}
+	if c.Kind == MicrosoftTeamsNotifier && c.WebhookURL == "" {
+		return fmt.Errorf("invalid notifier: no \"WebhookURL\" property found for kind \"%s\"", c.Kind)
+	}
 	if c.Kind == WebhookNotifier && c.EndpointURL == "" {
 		return fmt.Errorf("invalid notifier: no \"endpointUrl\" property found for kind \"%s\"", c.Kind)
 	}
@@ -32,15 +35,16 @@
 type NotifierKind string
 
 const (
-	SlackNotifier   NotifierKind = "slack"
-	WebhookNotifier NotifierKind = "webhook"
-	DiscordNotifier NotifierKind = "discord"
+	SlackNotifier          NotifierKind = "slack"
+	MicrosoftTeamsNotifier NotifierKind = "microsoftteams"
+	WebhookNotifier        NotifierKind = "webhook"
+	DiscordNotifier        NotifierKind = "discord"
 )
 
 // IsValid is checking if the value is part of the enum
 func (r NotifierKind) IsValid() error {
 	switch r {
-	case SlackNotifier, WebhookNotifier, DiscordNotifier:
+	case SlackNotifier, WebhookNotifier, DiscordNotifier, MicrosoftTeamsNotifier:
 		return nil
 	}
 	return fmt.Errorf("invalid notifier: kind \"%s\" is not supported", r)

cmd/relayproxy/service/gofeatureflag.go

@@ -21,6 +21,7 @@
 	"github.com/thomaspoignant/go-feature-flag/exporter/webhookexporter"
 	"github.com/thomaspoignant/go-feature-flag/notifier"
 	"github.com/thomaspoignant/go-feature-flag/notifier/discordnotifier"
+	"github.com/thomaspoignant/go-feature-flag/notifier/microsoftteamsnotifier"
 	"github.com/thomaspoignant/go-feature-flag/notifier/slacknotifier"
 	"github.com/thomaspoignant/go-feature-flag/notifier/webhooknotifier"
 	"github.com/thomaspoignant/go-feature-flag/retriever"
@@ -322,7 +323,13 @@
 				cNotif.WebhookURL = cNotif.SlackWebhookURL // nolint
 			}
 			notifiers = append(notifiers, &slacknotifier.Notifier{SlackWebhookURL: cNotif.WebhookURL})
-
+		case config.MicrosoftTeamsNotifier:
+			notifiers = append(
+				notifiers,
+				&microsoftteamsnotifier.Notifier{
+					MicrosoftTeamsWebhookURL: cNotif.WebhookURL,
+				},
+			)
 		case config.WebhookNotifier:
 			notifiers = append(notifiers,
 				&webhooknotifier.Notifier{

notifier/microsoftteamsnotifier/notifier.go

@@ -0,0 +1,212 @@
+package microsoftteamsnotifier
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/luci/go-render/render"
+	"github.com/r3labs/diff/v3"
+	"github.com/thomaspoignant/go-feature-flag/internal"
+	"github.com/thomaspoignant/go-feature-flag/notifier"
+)
+
+const (
+	colorDeleted                 = "#FF0000"
+	colorUpdated                 = "#FFA500"
+	colorAdded                   = "#008000"
+	goFFLogo                     = "https://raw.githubusercontent.com/thomaspoignant/go-feature-flag/main/logo_128.png"
+	microsoftteamsFooter         = "go-feature-flag"
+	longMicrosoftTeamsAttachment = 100
+)
+
+type Notifier struct {
+	MicrosoftTeamsWebhookURL string
+
+	httpClient internal.HTTPClient
+	init       sync.Once
+}
+
+func (c *Notifier) Notify(diff notifier.DiffCache) error {
+	if c.MicrosoftTeamsWebhookURL == "" {
+		return fmt.Errorf("error: (Microsoft Teams Notifier) invalid notifier configuration, no " +
+			"MicrosoftTeamsWebhookURL provided for the microsoft teams notifier")
+	}
+
+	// init the notifier
+	c.init.Do(func() {
+		if c.httpClient == nil {
+			c.httpClient = internal.DefaultHTTPClient()
+		}
+	})
+
+	microsoftteamsURL, err := url.Parse(c.MicrosoftTeamsWebhookURL)
+	if err != nil {
+		return fmt.Errorf("error: (Microsoft Teams Notifier) invalid MicrosoftTeamsWebhookURL: %v",
+			c.MicrosoftTeamsWebhookURL)
+	}
+
+	reqBody := convertToMicrosoftTeamsMessage(diff)
+	payload, err := json.Marshal(reqBody)
+	if err != nil {
+		return fmt.Errorf("error: (Microsoft Teams Notifier) impossible to read differences; %v", err)
+	}
+	microsoftTeamAccessToken := os.Getenv("MICROSOFT_TEAMS_ACCESS_TOKEN")
+	request := http.Request{
+		Method: http.MethodPost,
+		URL:    microsoftteamsURL,
+		Body:   io.NopCloser(bytes.NewReader(payload)),
+		Header: map[string][]string{
+			"Content-Type":  {"application/json"},
+			"Authorization": {"Bearer " + microsoftTeamAccessToken},
+		},
+	}
+	response, err := c.httpClient.Do(&request)
+	if err != nil {
+		return fmt.Errorf("error: (Microsoft Teams Notifier) error: while calling webhook: %v", err)
+	}
+
+	defer func() { _ = response.Body.Close() }()
+	if response.StatusCode > 399 {
+		return fmt.Errorf("error: (Microsoft Teams Notifier) while calling microsoft teams webhook, statusCode = %d",
+			response.StatusCode)
+	}
+
+	return nil
+}
+
+func convertToMicrosoftTeamsMessage(diffCache notifier.DiffCache) AdaptiveCard {
+	hostname, _ := os.Hostname()
+	attachments := convertDeletedFlagsToMicrosoftTeamsMessage(diffCache)
+	attachments = append(attachments, convertUpdatedFlagsToMicrosoftTeamsMessage(diffCache)...)
+	attachments = append(attachments, convertAddedFlagsToMicrosoftTeamsMessage(diffCache)...)
+	sections := attachmentsToSections(attachments)
+	res := AdaptiveCard{
+		Type:     "MessageCard",
+		Context:  "https://schema.org/extensions",
+		Summary:  fmt.Sprintf("Changes detected in your feature flag file on: *%s*", hostname),
+		Sections: sections,
+	}
+	return res
+}
+
+func convertDeletedFlagsToMicrosoftTeamsMessage(diffCache notifier.DiffCache) []attachment {
+	attachments := make([]attachment, 0)
+	for key := range diffCache.Deleted {
+		attachment := attachment{
+			Title:      fmt.Sprintf("❌ Flag \"%s\" deleted", key),
+			Color:      colorDeleted,
+			FooterIcon: goFFLogo,
+			Footer:     microsoftteamsFooter,
+		}
+		attachments = append(attachments, attachment)
+	}
+	return attachments
+}
+
+func convertUpdatedFlagsToMicrosoftTeamsMessage(diffCache notifier.DiffCache) []attachment {
+	attachments := make([]attachment, 0)
+	for key, value := range diffCache.Updated {
+		attachment := attachment{
+			Title:      fmt.Sprintf("✏️ Flag \"%s\" updated", key),
+			Color:      colorUpdated,
+			FooterIcon: goFFLogo,
+			Footer:     microsoftteamsFooter,
+			Fields:     []Field{},
+		}
+
+		changelog, _ := diff.Diff(value.Before, value.After, diff.AllowTypeMismatch(true))
+		for _, change := range changelog {
+			if change.Type == "update" {
+				value := fmt.Sprintf("%s => %s", render.Render(change.From), render.Render(change.To))
+				short := len(value) < longMicrosoftTeamsAttachment
+				attachment.Fields = append(
+					attachment.Fields,
+					Field{Title: strings.Join(change.Path, "."), Short: short, Value: value},
+				)
+			}
+		}
+
+		sort.Sort(byTitle(attachment.Fields))
+
+		attachments = append(attachments, attachment)
+	}
+	return attachments
+}
+
+func convertAddedFlagsToMicrosoftTeamsMessage(diff notifier.DiffCache) []attachment {
+	attachments := make([]attachment, 0)
+	for key := range diff.Added {
+		attachment := attachment{
+			Title:      fmt.Sprintf("🆕 Flag \"%s\" created", key),
+			Color:      colorAdded,
+			FooterIcon: goFFLogo,
+			Footer:     microsoftteamsFooter,
+		}
+		attachments = append(attachments, attachment)
+	}
+	return attachments
+}
+
+func attachmentsToSections(attachments []attachment) []Section {
+	sections := make([]Section, len(attachments))
+	for i, att := range attachments {
+		facts := make([]Fact, len(att.Fields))
+		for j, field := range att.Fields {
+			facts[j] = Fact(field)
+		}
+
+		sections[i] = Section{
+			Title: att.Title,
+			Color: att.Color,
+			Facts: facts,
+		}
+	}
+	return sections
+}
+
+type AdaptiveCard struct {
+	Type     string    `json:"@type"`
+	Context  string    `json:"@context"`
+	Summary  string    `json:"summary"`
+	Sections []Section `json:"sections"`
+}
+
+type Section struct {
+	Title string `json:"title,omitempty"`
+	Text  string `json:"text,omitempty"`
+	Color string `json:"color,omitempty"`
+	Facts []Fact `json:"facts,omitempty"`
+}
+
+type Fact struct {
+	Title string `json:"title"`
+	Value string `json:"value"`
+	Short bool   `json:"short"`
+}
+type attachment struct {
+	Title      string  `json:"title"`
+	Color      string  `json:"color"`
+	FooterIcon string  `json:"footer_icon"`
+	Footer     string  `json:"footer"`
+	Fields     []Field `json:"fields,omitempty"`
+}
+
+type Field struct {
+	Title string `json:"title"`
+	Value string `json:"value"`
+	Short bool   `json:"short"`
+}
+
+type byTitle []Field
+
+func (a byTitle) Len() int           { return len(a) }
+func (a byTitle) Less(i, j int) bool { return a[i].Title < a[j].Title }
+func (a byTitle) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }