snapshot of https://github.com/mattermost/mattermost.git (master, 2026-09-16; blobs > 131072B omitted)

server/channels/api4/reaction.go

@@ -0,0 +1,115 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+)
+
+func (api *API) InitReaction() {
+	api.BaseRoutes.Reactions.Handle("", api.APISessionRequired(saveReaction)).Methods(http.MethodPost)
+	api.BaseRoutes.Post.Handle("/reactions", api.APISessionRequired(getReactions)).Methods(http.MethodGet)
+	api.BaseRoutes.ReactionByNameForPostForUser.Handle("", api.APISessionRequired(deleteReaction)).Methods(http.MethodDelete)
+}
+
+func saveReaction(c *Context, w http.ResponseWriter, r *http.Request) {
+	var reaction model.Reaction
+	if jsonErr := json.NewDecoder(r.Body).Decode(&reaction); jsonErr != nil {
+		c.SetInvalidParamWithErr("reaction", jsonErr)
+		return
+	}
+
+	reaction.EmojiName = strings.ToLower(reaction.EmojiName)
+
+	if !model.IsValidId(reaction.UserId) || !model.IsValidId(reaction.PostId) || reaction.EmojiName == "" || len(reaction.EmojiName) > model.EmojiNameMaxLength {
+		c.Err = model.NewAppError("saveReaction", "api.reaction.save_reaction.invalid.app_error", nil, "", http.StatusBadRequest)
+		return
+	}
+
+	if reaction.UserId != c.AppContext.Session().UserId {
+		c.Err = model.NewAppError("saveReaction", "api.reaction.save_reaction.user_id.app_error", nil, "", http.StatusForbidden)
+		return
+	}
+
+	if !c.App.SessionHasPermissionToChannelByPost(*c.AppContext.Session(), reaction.PostId, model.PermissionAddReaction) {
+		c.SetPermissionError(model.PermissionAddReaction)
+		return
+	}
+
+	re, err := c.App.SaveReactionForPost(c.AppContext, &reaction)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	if err := json.NewEncoder(w).Encode(re); err != nil {
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
+	}
+}
+
+func getReactions(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequirePostId()
+	if c.Err != nil {
+		return
+	}
+
+	if ok, _ := c.App.SessionHasPermissionToReadPost(c.AppContext, *c.AppContext.Session(), c.Params.PostId); !ok {
+		c.SetPermissionError(model.PermissionReadChannelContent)
+		return
+	}
+
+	reactions, appErr := c.App.GetReactionsForPost(c.Params.PostId)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	js, err := json.Marshal(reactions)
+	if err != nil {
+		c.Err = model.NewAppError("getReactions", "api.marshal_error", nil, "", http.StatusInternalServerError).Wrap(err)
+		return
+	}
+
+	if _, err := w.Write(js); err != nil {
+		c.Logger.Warn("Error while writing js response", mlog.Err(err))
+	}
+}
+
+func deleteReaction(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireUserId().RequirePostId().RequireEmojiName()
+	if c.Err != nil {
+		return
+	}
+
+	emojiName := strings.ToLower(c.Params.EmojiName)
+
+	if !c.App.SessionHasPermissionToChannelByPost(*c.AppContext.Session(), c.Params.PostId, model.PermissionRemoveReaction) {
+		c.SetPermissionError(model.PermissionRemoveReaction)
+		return
+	}
+
+	if c.Params.UserId != c.AppContext.Session().UserId && !c.App.SessionHasPermissionTo(*c.AppContext.Session(), model.PermissionRemoveOthersReactions) {
+		c.SetPermissionError(model.PermissionRemoveOthersReactions)
+		return
+	}
+
+	reaction := &model.Reaction{
+		UserId:    c.Params.UserId,
+		PostId:    c.Params.PostId,
+		EmojiName: emojiName,
+	}
+
+	err := c.App.DeleteReactionForPost(c.AppContext, reaction)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	ReturnStatusOK(w)
+}