Add support for Matrix notification

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

api/v1beta1/provider_types.go

@@ -28,7 +28,7 @@ const (
 // ProviderSpec defines the desired state of Provider
 type ProviderSpec struct {
 	// Type of provider
-	// +kubebuilder:validation:Enum=slack;discord;msteams;rocket;generic;github;gitlab;bitbucket;azuredevops;googlechat;webex;sentry;azureeventhub;telegram;lark
+	// +kubebuilder:validation:Enum=slack;discord;msteams;rocket;generic;github;gitlab;bitbucket;azuredevops;googlechat;webex;sentry;azureeventhub;telegram;lark;matrix;
 	// +required
 	Type string `json:"type"`
 
@@ -79,6 +79,7 @@ const (
 	AzureEventHubProvider string = "azureeventhub"
 	TelegramProvider      string = "telegram"
 	LarkProvider          string = "lark"
+	Matrix                string = "matrix"
 )
 
 // ProviderStatus defines the observed state of Provider

config/crd/bases/notification.toolkit.fluxcd.io_providers.yaml

@@ -89,6 +89,7 @@ spec:
                 - azureeventhub
                 - telegram
                 - lark
+                - matrix
                 type: string
               username:
                 description: Bot username for this provider

docs/spec/v1beta1/provider.md

@@ -362,3 +362,28 @@ spec:
   secretRef:
     name: lark-token
 ```
+
+## Matrix
+For Matrix, the address is the homeserver URL and the token is the access token returned by a call
+to /login or /register 
+
+To create secret
+```
+kubectl create secret generic matrix-token \
+--from-literal=token=<access-token> \
+--from-literal=address=https://matrix.org # replace with if using a different server
+```
+
+`spec.channel` holds the room id.
+```yaml
+apiVersion: notification.toolkit.fluxcd.io/v1beta1
+kind: Provider
+metadata:
+  name: matrix
+  namespace: flux-system
+spec:
+  type: matrix
+  channel: "!jezptmDwEeLapMLjOc:matrix.org"
+  secretRef:
+    name: matrix-token
+```

internal/notifier/factory.go

@@ -81,6 +81,8 @@ func (f Factory) Notifier(provider string) (Interface, error) {
 		n, err = NewTelegram(f.Channel, f.Token)
 	case v1beta1.LarkProvider:
 		n, err = NewLark(f.URL)
+	case v1beta1.Matrix:
+		n, err = NewMatrix(f.URL, f.Token, f.Channel)
 	default:
 		err = fmt.Errorf("provider %s not supported", provider)
 	}

internal/notifier/matrix.go

@@ -0,0 +1,82 @@
+package notifier
+
+import (
+	"crypto/sha1"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/fluxcd/pkg/runtime/events"
+	"github.com/hashicorp/go-retryablehttp"
+)
+
+type Matrix struct {
+	Token  string
+	URL    string
+	RoomId string
+}
+
+type MatrixPayload struct {
+	Body    string `json:"body"`
+	MsgType string `json:"msgtype"`
+}
+
+func NewMatrix(serverURL, token, roomId string) (*Matrix, error) {
+	_, err := url.ParseRequestURI(serverURL)
+	if err != nil {
+		return nil, fmt.Errorf("invalid Matrix homeserver URL %s", serverURL)
+	}
+
+	return &Matrix{
+		URL:    serverURL,
+		RoomId: roomId,
+		Token:  token,
+	}, nil
+}
+
+func (m *Matrix) Post(event events.Event) error {
+	txId, err := sha1sum(event)
+	if err != nil {
+		return fmt.Errorf("unable to generate unique tx id: %s", err)
+	}
+	fullURL := fmt.Sprintf("%s/_matrix/client/r0/rooms/%s/send/m.room.message/%s",
+		m.URL, m.RoomId, txId)
+
+	emoji := "💫"
+	if event.Severity == events.EventSeverityError {
+		emoji = "🚨"
+	}
+	var metadata string
+	for k, v := range event.Metadata {
+		metadata = metadata + fmt.Sprintf("- %s: %s\n", k, v)
+	}
+	heading := fmt.Sprintf("%s %s/%s.%s", emoji, strings.ToLower(event.InvolvedObject.Kind),
+		event.InvolvedObject.Name, event.InvolvedObject.Namespace)
+	msg := fmt.Sprintf("%s\n%s\n%s", heading, event.Message, metadata)
+
+	payload := MatrixPayload{
+		Body:    msg,
+		MsgType: "m.text",
+	}
+
+	err = postMessage(fullURL, "", nil, payload, func(request *retryablehttp.Request) {
+		request.Method = http.MethodPut
+		request.Header.Add("Authorization", "Bearer "+m.Token)
+	})
+	if err != nil {
+		return fmt.Errorf("postMessage failed: %w", err)
+	}
+
+	return nil
+}
+
+func sha1sum(event events.Event) (string, error) {
+	val, err := json.Marshal(event)
+	if err != nil {
+		return "", err
+	}
+	digest := sha1.Sum(val)
+	return fmt.Sprintf("%x", digest), nil
+}

internal/notifier/matrix_test.go

@@ -0,0 +1,50 @@
+package notifier
+
+import (
+	"testing"
+	"time"
+
+	"github.com/fluxcd/pkg/runtime/events"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestSha1Sum(t *testing.T) {
+	timestamp, err := time.Parse("Jan 2, 2006 at 3:04pm (WAT)", "Aug 24, 2021 at 4:18pm (WAT)")
+	if err != nil {
+		t.Fatalf("unexpected error getting timestamp: %s", err)
+	}
+
+	tests := []struct {
+		event events.Event
+		sha1  string
+	}{
+		{
+			event: events.Event{
+				InvolvedObject: corev1.ObjectReference{},
+				Severity:       events.EventSeverityInfo,
+				Timestamp: metav1.Time{
+					Time: timestamp,
+				},
+				Message:             "update successful",
+				Reason:              "update sucesful",
+				Metadata:            nil,
+				ReportingController: "",
+				ReportingInstance:   "",
+			},
+			sha1: "37d91b4f6a1e44c6a38273b0a0fd408fade7b0f5",
+		},
+	}
+
+	for _, tt := range tests {
+		hash, err := sha1sum(tt.event)
+		if err != nil {
+			t.Fatalf("unexpected err: %s", err)
+		}
+
+		if tt.sha1 != hash {
+			t.Errorf("wrong sha1 sum from event %v. expected %q got %q",
+				tt.event, tt.sha1, hash)
+		}
+	}
+}