feat(GODT-2576): Forward flag support

Add routes to mark messages as forwarded.

message.go

@@ -108,6 +108,30 @@ func (c *Client) MarkMessagesRead(ctx context.Context, messageIDs ...string) err
 	return nil
 }
 
+func (c *Client) MarkMessagesForwarded(ctx context.Context, messageIDs ...string) error {
+	for _, page := range xslices.Chunk(messageIDs, maxPageSize) {
+		if err := c.do(ctx, func(r *resty.Request) (*resty.Response, error) {
+			return r.SetBody(MessageActionReq{IDs: page}).Put("/mail/v4/messages/forward")
+		}); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c *Client) MarkMessagesUnForwarded(ctx context.Context, messageIDs ...string) error {
+	for _, page := range xslices.Chunk(messageIDs, maxPageSize) {
+		if err := c.do(ctx, func(r *resty.Request) (*resty.Response, error) {
+			return r.SetBody(MessageActionReq{IDs: page}).Put("/mail/v4/messages/unforward")
+		}); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (c *Client) MarkMessagesUnread(ctx context.Context, messageIDs ...string) error {
 	for _, page := range xslices.Chunk(messageIDs, maxPageSize) {
 		req := MessageActionReq{IDs: page}

server/backend/api.go

@@ -514,6 +514,30 @@ func (b *Backend) SetMessagesRead(userID string, read bool, messageIDs ...string
 		})
 	})
 }
+
+func (b *Backend) SetMessagesForwarded(userID string, forwarded bool, messageIDs ...string) error {
+	return b.withAcc(userID, func(acc *account) error {
+		return b.withMessages(func(messages map[string]*message) error {
+			for _, messageID := range messageIDs {
+				if forwarded {
+					messages[messageID].flags |= proton.MessageFlagForwarded
+				} else {
+					messages[messageID].flags &= ^proton.MessageFlagForwarded
+				}
+
+				updateID, err := b.newUpdate(&messageUpdated{messageID: messageID})
+				if err != nil {
+					return err
+				}
+
+				acc.updateIDs = append(acc.updateIDs, updateID)
+			}
+
+			return nil
+		})
+	})
+}
+
 func (b *Backend) LabelMessages(userID, labelID string, messageIDs ...string) error {
 	return b.labelMessages(userID, labelID, true, messageIDs...)
 }

server/backend/message.go

@@ -186,8 +186,9 @@ func (msg *message) toMetadata(attData map[string][]byte, att map[string]*attach
 		ReplyTos: msg.replytos,
 		Size:     messageSize,
 
-		Flags:  msg.flags,
-		Unread: proton.Bool(msg.unread),
+		Flags:       msg.flags,
+		Unread:      proton.Bool(msg.unread),
+		IsForwarded: msg.flags&proton.MessageFlagForwarded != 0,
 
 		NumAttachments: len(attData),
 	}

server/messages.go

@@ -224,6 +224,38 @@ func (s *Server) handlePutMailMessagesUnread() gin.HandlerFunc {
 	}
 }
 
+func (s *Server) handlePutMailMessagesForwarded() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req proton.MessageActionReq
+
+		if err := c.BindJSON(&req); err != nil {
+			c.AbortWithStatus(http.StatusBadRequest)
+			return
+		}
+
+		if err := s.b.SetMessagesForwarded(c.GetString("UserID"), true, req.IDs...); err != nil {
+			c.AbortWithStatus(http.StatusUnprocessableEntity)
+			return
+		}
+	}
+}
+
+func (s *Server) handlePutMailMessagesUnforwarded() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req proton.MessageActionReq
+
+		if err := c.BindJSON(&req); err != nil {
+			c.AbortWithStatus(http.StatusBadRequest)
+			return
+		}
+
+		if err := s.b.SetMessagesForwarded(c.GetString("UserID"), false, req.IDs...); err != nil {
+			c.AbortWithStatus(http.StatusUnprocessableEntity)
+			return
+		}
+	}
+}
+
 func (s *Server) handlePutMailMessagesLabel() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		var req proton.LabelMessagesReq

server/router.go

@@ -101,6 +101,8 @@ func initRouter(s *Server) {
 			messages.POST("/import", s.handlePutMailMessagesImport())
 			messages.PUT("/delete", s.handleDeleteMailMessages())
 			messages.GET("/count", s.handleMessageGroupCount())
+			messages.PUT("/forward", s.handlePutMailMessagesForwarded())
+			messages.PUT("/unforward", s.handlePutMailMessagesUnforwarded())
 		}
 
 		if attachments := mail.Group("/attachments"); attachments != nil {

server/server_test.go

@@ -362,6 +362,8 @@ func TestServer_Events(t *testing.T) {
 
 				// Mark a message as read.
 				require.NoError(t, c.MarkMessagesRead(ctx, messageIDs[0]))
+				// Mark a message as forwarded
+				require.NoError(t, c.MarkMessagesForwarded(ctx, messageIDs[0]))
 
 				// The message should eventually be read.
 				require.Eventually(t, func() bool {
@@ -375,7 +377,7 @@ func TestServer_Events(t *testing.T) {
 						return false
 					}
 
-					return !bool(event.Messages[0].Message.Unread)
+					return !bool(event.Messages[0].Message.Unread) && bool(event.Messages[0].Message.IsForwarded)
 				}, 5*time.Second, time.Millisecond*100)
 
 				// Add another message to archive.