feat: add stdout and filesystem notification channels (#2925)

* feat: add filesystem and stdout notification channels

* configure through env vars

* compile

* feat: add compact option for debug notification channels

* fix channel mock generation

* avoid sensitive information in error message

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

* add review improvements

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

internal/notification/senders/chain.go

@@ -0,0 +1,24 @@
+package senders
+
+import "github.com/caos/zitadel/internal/notification/channels"
+
+var _ channels.NotificationChannel = (*Chain)(nil)
+
+type Chain struct {
+	channels []channels.NotificationChannel
+}
+
+func chainChannels(channel ...channels.NotificationChannel) *Chain {
+	return &Chain{channels: channel}
+}
+
+// HandleMessage returns a non nil error from a provider immediately if any occurs
+// messages are sent to channels in the same order they were provided to chainChannels()
+func (c *Chain) HandleMessage(message channels.Message) error {
+	for i := range c.channels {
+		if err := c.channels[i].HandleMessage(message); err != nil {
+			return err
+		}
+	}
+	return nil
+}

internal/notification/senders/debug.go

@@ -0,0 +1,46 @@
+package senders
+
+import (
+	"github.com/caos/zitadel/internal/config/systemdefaults"
+	"github.com/caos/zitadel/internal/notification/channels"
+	"github.com/caos/zitadel/internal/notification/channels/chat"
+	"github.com/caos/zitadel/internal/notification/channels/fs"
+	"github.com/caos/zitadel/internal/notification/channels/log"
+)
+
+func debugChannels(config systemdefaults.Notifications) (channels.NotificationChannel, error) {
+
+	var (
+		providers  []channels.NotificationChannel
+		enableChat bool
+	)
+
+	if config.Providers.Chat.Enabled != nil {
+		enableChat = *config.Providers.Chat.Enabled
+	} else {
+		// ensures backward compatible configuration
+		enableChat = config.DebugMode
+	}
+
+	if enableChat {
+		p, err := chat.InitChatChannel(config.Providers.Chat)
+		if err != nil {
+			return nil, err
+		}
+		providers = append(providers, p)
+	}
+
+	if config.Providers.FileSystem.Enabled {
+		p, err := fs.InitFSChannel(config.Providers.FileSystem)
+		if err != nil {
+			return nil, err
+		}
+		providers = append(providers, p)
+	}
+
+	if config.Providers.Log.Enabled {
+		providers = append(providers, log.InitStdoutChannel(config.Providers.Log))
+	}
+
+	return chainChannels(providers...), nil
+}

internal/notification/senders/email.go

@@ -0,0 +1,25 @@
+package senders
+
+import (
+	"github.com/caos/zitadel/internal/config/systemdefaults"
+	"github.com/caos/zitadel/internal/notification/channels"
+	"github.com/caos/zitadel/internal/notification/channels/smtp"
+)
+
+func EmailChannels(config systemdefaults.Notifications) (channels.NotificationChannel, error) {
+
+	debug, err := debugChannels(config)
+	if err != nil {
+		return nil, err
+	}
+
+	if !config.DebugMode {
+		p, err := smtp.InitSMTPChannel(config.Providers.Email)
+		if err != nil {
+			return nil, err
+		}
+		return chainChannels(debug, p), nil
+	}
+
+	return debug, nil
+}

internal/notification/senders/sms.go

@@ -0,0 +1,21 @@
+package senders
+
+import (
+	"github.com/caos/zitadel/internal/config/systemdefaults"
+	"github.com/caos/zitadel/internal/notification/channels"
+	"github.com/caos/zitadel/internal/notification/channels/twilio"
+)
+
+func SMSChannels(config systemdefaults.Notifications) (channels.NotificationChannel, error) {
+
+	debug, err := debugChannels(config)
+	if err != nil {
+		return nil, err
+	}
+
+	if !config.DebugMode {
+		return chainChannels(debug, twilio.InitTwilioChannel(config.Providers.Twilio)), nil
+	}
+
+	return debug, nil
+}