Implement MS Teams notifier

pkg/notifier/factory.go

@@ -22,6 +22,8 @@ func (f Factory) Notifier() (Interface, error) {
 	switch {
 	case strings.Contains(f.URL, "slack.com"):
 		return NewSlack(f.URL, f.Username, f.Channel)
+	case strings.Contains(f.URL, "office.com"):
+		return NewMSTeams(f.URL)
 	}
 
 	return nil, nil

pkg/notifier/teams.go

@@ -0,0 +1,94 @@
+package notifier
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+)
+
+// MS Teams holds the incoming webhook URL
+type MSTeams struct {
+	URL string
+}
+
+// MSTeamsPayload holds the message card data
+type MSTeamsPayload struct {
+	Type       string           `json:"@type"`
+	Context    string           `json:"@context"`
+	ThemeColor string           `json:"themeColor"`
+	Summary    string           `json:"summary"`
+	Sections   []MSTeamsSection `json:"sections"`
+}
+
+// MSTeamsSection holds the canary analysis result
+type MSTeamsSection struct {
+	ActivityTitle    string         `json:"activityTitle"`
+	ActivitySubtitle string         `json:"activitySubtitle"`
+	Facts            []MSTeamsField `json:"facts"`
+}
+
+type MSTeamsField struct {
+	Name  string `json:"name"`
+	Value string `json:"value"`
+}
+
+// NewMSTeams validates the MS Teams URL and returns a MSTeams object
+func NewMSTeams(hookURL string) (*MSTeams, error) {
+	_, err := url.ParseRequestURI(hookURL)
+	if err != nil {
+		return nil, fmt.Errorf("invalid MS Teams webhook URL %s", hookURL)
+	}
+
+	return &MSTeams{
+		URL: hookURL,
+	}, nil
+}
+
+// Post MS Teams message
+func (s *MSTeams) Post(workload string, namespace string, message string, fields []Field, warn bool) error {
+	facts := make([]MSTeamsField, len(fields))
+	for _, f := range fields {
+		facts = append(facts, MSTeamsField{f.Name, f.Value})
+	}
+
+	payload := MSTeamsPayload{
+		Type:       "MessageCard",
+		Context:    "http://schema.org/extensions",
+		ThemeColor: "0076D7",
+		Summary:    fmt.Sprintf("%s.%s", workload, namespace),
+		Sections: []MSTeamsSection{
+			{
+				ActivityTitle:    message,
+				ActivitySubtitle: fmt.Sprintf("%s.%s", workload, namespace),
+				Facts:            facts,
+			},
+		},
+	}
+
+	if warn {
+		payload.ThemeColor = "FF0000"
+	}
+
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("marshalling slack payload failed %v", err)
+	}
+
+	b := bytes.NewBuffer(data)
+
+	if res, err := http.Post(s.URL, "application/json", b); err != nil {
+		return fmt.Errorf("sending data to MS Teams failed %v", err)
+	} else {
+		defer res.Body.Close()
+		statusCode := res.StatusCode
+		if statusCode != 200 {
+			body, _ := ioutil.ReadAll(res.Body)
+			return fmt.Errorf("sending data to MS Teams failed %v", string(body))
+		}
+	}
+
+	return nil
+}