func WriteFile(f []byte, path string) *model.AppError {
	if utils.Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
		endpoint := utils.Cfg.FileSettings.AmazonS3Endpoint
		accessKey := utils.Cfg.FileSettings.AmazonS3AccessKeyId
		secretKey := utils.Cfg.FileSettings.AmazonS3SecretAccessKey
		secure := *utils.Cfg.FileSettings.AmazonS3SSL
		s3Clnt, err := s3.New(endpoint, accessKey, secretKey, secure)
		if err != nil {
			return model.NewLocAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error())
		}
		bucket := utils.Cfg.FileSettings.AmazonS3Bucket
		ext := filepath.Ext(path)

		if model.IsFileExtImage(ext) {
			_, err = s3Clnt.PutObject(bucket, path, bytes.NewReader(f), model.GetImageMimeType(ext))
		} else {
			_, err = s3Clnt.PutObject(bucket, path, bytes.NewReader(f), "binary/octet-stream")
		}
		if err != nil {
			return model.NewLocAppError("WriteFile", "api.file.write_file.s3.app_error", nil, err.Error())
		}
	} else if utils.Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
		if err := writeFileLocally(f, utils.Cfg.FileSettings.Directory+path); err != nil {
			return err
		}
	} else {
		return model.NewLocAppError("WriteFile", "api.file.write_file.configured.app_error", nil, "")
	}

	return nil
}

func writeFile(f []byte, path string) *model.AppError {

	if utils.Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_S3 {
		var auth aws.Auth
		auth.AccessKey = utils.Cfg.FileSettings.AmazonS3AccessKeyId
		auth.SecretKey = utils.Cfg.FileSettings.AmazonS3SecretAccessKey

		s := s3.New(auth, awsRegion())
		bucket := s.Bucket(utils.Cfg.FileSettings.AmazonS3Bucket)

		ext := filepath.Ext(path)

		var err error
		if model.IsFileExtImage(ext) {
			options := s3.Options{}
			err = bucket.Put(path, f, model.GetImageMimeType(ext), s3.Private, options)

		} else {
			options := s3.Options{}
			err = bucket.Put(path, f, "binary/octet-stream", s3.Private, options)
		}

		if err != nil {
			return model.NewAppError("writeFile", "Encountered an error writing to S3", err.Error())
		}
	} else if utils.Cfg.FileSettings.DriverName == model.IMAGE_DRIVER_LOCAL {
		if err := writeFileLocally(f, utils.Cfg.FileSettings.Directory+path); err != nil {
			return err
		}
	} else {
		return model.NewAppError("writeFile", "File storage not configured properly. Please configure for either S3 or local server file storage.", "")
	}

	return nil
}

func getMessageForNotification(post *model.Post, translateFunc i18n.TranslateFunc) string {
	if len(strings.TrimSpace(post.Message)) != 0 || len(post.Filenames) == 0 {
		return post.Message
	}

	// extract the filenames from their paths and determine what type of files are attached
	filenames := make([]string, len(post.Filenames))
	onlyImages := true
	for i, filename := range post.Filenames {
		var err error
		if filenames[i], err = url.QueryUnescape(filepath.Base(filename)); err != nil {
			// this should never error since filepath was escaped using url.QueryEscape
			filenames[i] = filepath.Base(filename)
		}

		ext := filepath.Ext(filename)
		onlyImages = onlyImages && model.IsFileExtImage(ext)
	}

	props := map[string]interface{}{"Filenames": strings.Join(filenames, ", ")}

	if onlyImages {
		return translateFunc("api.post.get_message_for_notification.images_sent", len(filenames), props)
	} else {
		return translateFunc("api.post.get_message_for_notification.files_sent", len(filenames), props)
	}
}

func writeFile(f []byte, path string) *model.AppError {

	if utils.IsS3Configured() && !utils.Cfg.ServiceSettings.UseLocalStorage {
		var auth aws.Auth
		auth.AccessKey = utils.Cfg.AWSSettings.S3AccessKeyId
		auth.SecretKey = utils.Cfg.AWSSettings.S3SecretAccessKey

		s := s3.New(auth, aws.Regions[utils.Cfg.AWSSettings.S3Region])
		bucket := s.Bucket(utils.Cfg.AWSSettings.S3Bucket)

		ext := filepath.Ext(path)

		var err error
		if model.IsFileExtImage(ext) {
			options := s3.Options{}
			err = bucket.Put(path, f, model.GetImageMimeType(ext), s3.Private, options)

		} else {
			options := s3.Options{}
			err = bucket.Put(path, f, "binary/octet-stream", s3.Private, options)
		}

		if err != nil {
			return model.NewAppError("writeFile", "Encountered an error writing to S3", err.Error())
		}
	} else if utils.Cfg.ServiceSettings.UseLocalStorage && len(utils.Cfg.ServiceSettings.StorageDirectory) > 0 {
		if err := os.MkdirAll(filepath.Dir(utils.Cfg.ServiceSettings.StorageDirectory+path), 0774); err != nil {
			return model.NewAppError("writeFile", "Encountered an error creating the directory for the new file", err.Error())
		}

		if err := ioutil.WriteFile(utils.Cfg.ServiceSettings.StorageDirectory+path, f, 0644); err != nil {
			return model.NewAppError("writeFile", "Encountered an error writing to local server storage", err.Error())
		}
	} else {
		return model.NewAppError("writeFile", "File storage not configured properly. Please configure for either S3 or local server file storage.", "")
	}

	return nil
}

func uploadFile(c *Context, w http.ResponseWriter, r *http.Request) {
	if !utils.IsS3Configured() && !utils.Cfg.ServiceSettings.UseLocalStorage {
		c.Err = model.NewAppError("uploadFile", "Unable to upload file. Amazon S3 not configured and local server storage turned off. ", "")
		c.Err.StatusCode = http.StatusNotImplemented
		return
	}

	err := r.ParseMultipartForm(model.MAX_FILE_SIZE)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	m := r.MultipartForm

	props := m.Value

	if len(props["channel_id"]) == 0 {
		c.SetInvalidParam("uploadFile", "channel_id")
		return
	}
	channelId := props["channel_id"][0]
	if len(channelId) == 0 {
		c.SetInvalidParam("uploadFile", "channel_id")
		return
	}

	cchan := Srv.Store.Channel().CheckPermissionsTo(c.Session.TeamId, channelId, c.Session.UserId)

	files := m.File["files"]

	resStruct := &model.FileUploadResponse{
		Filenames: []string{},
		ClientIds: []string{},
	}

	imageNameList := []string{}
	imageDataList := [][]byte{}

	if !c.HasPermissionsToChannel(cchan, "uploadFile") {
		return
	}

	for i, _ := range files {
		file, err := files[i].Open()
		defer file.Close()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		buf := bytes.NewBuffer(nil)
		io.Copy(buf, file)

		filename := filepath.Base(files[i].Filename)

		uid := model.NewId()

		path := "teams/" + c.Session.TeamId + "/channels/" + channelId + "/users/" + c.Session.UserId + "/" + uid + "/" + filename

		if err := writeFile(buf.Bytes(), path); err != nil {
			c.Err = err
			return
		}

		if model.IsFileExtImage(filepath.Ext(files[i].Filename)) {
			imageNameList = append(imageNameList, uid+"/"+filename)
			imageDataList = append(imageDataList, buf.Bytes())
		}

		encName := utils.UrlEncode(filename)

		fileUrl := "/" + channelId + "/" + c.Session.UserId + "/" + uid + "/" + encName
		resStruct.Filenames = append(resStruct.Filenames, fileUrl)
	}

	for _, clientId := range props["client_ids"] {
		resStruct.ClientIds = append(resStruct.ClientIds, clientId)
	}

	fireAndForgetHandleImages(imageNameList, imageDataList, c.Session.TeamId, channelId, c.Session.UserId)

	w.Write([]byte(resStruct.ToJson()))
}

//.........这里部分代码省略.........
			year := fmt.Sprintf("%d", tm.Year())
			zone, _ := tm.Zone()

			subjectPage := utils.NewHTMLTemplate("post_subject", profileMap[id].Locale)
			subjectPage.Props["Subject"] = userLocale("api.templates.post_subject",
				map[string]interface{}{"SubjectText": subjectText, "TeamDisplayName": team.DisplayName,
					"Month": month[:3], "Day": day, "Year": year})
			subjectPage.Props["SiteName"] = utils.Cfg.TeamSettings.SiteName

			bodyPage := utils.NewHTMLTemplate("post_body", profileMap[id].Locale)
			bodyPage.Props["SiteURL"] = c.GetSiteURL()
			bodyPage.Props["PostMessage"] = model.ClearMentionTags(post.Message)
			bodyPage.Props["TeamLink"] = teamURL + "/channels/" + channel.Name
			bodyPage.Props["BodyText"] = bodyText
			bodyPage.Props["Button"] = userLocale("api.templates.post_body.button")
			bodyPage.Html["Info"] = template.HTML(userLocale("api.templates.post_body.info",
				map[string]interface{}{"ChannelName": channelName, "SenderName": senderName,
					"Hour": fmt.Sprintf("%02d", tm.Hour()), "Minute": fmt.Sprintf("%02d", tm.Minute()),
					"TimeZone": zone, "Month": month, "Day": day}))

			// attempt to fill in a message body if the post doesn't have any text
			if len(strings.TrimSpace(bodyPage.Props["PostMessage"])) == 0 && len(post.Filenames) > 0 {
				// extract the filenames from their paths and determine what type of files are attached
				filenames := make([]string, len(post.Filenames))
				onlyImages := true
				for i, filename := range post.Filenames {
					var err error
					if filenames[i], err = url.QueryUnescape(filepath.Base(filename)); err != nil {
						// this should never error since filepath was escaped using url.QueryEscape
						filenames[i] = filepath.Base(filename)
					}

					ext := filepath.Ext(filename)
					onlyImages = onlyImages && model.IsFileExtImage(ext)
				}
				filenamesString := strings.Join(filenames, ", ")

				var attachmentPrefix string
				if onlyImages {
					attachmentPrefix = "Image"
				} else {
					attachmentPrefix = "File"
				}
				if len(post.Filenames) > 1 {
					attachmentPrefix += "s"
				}

				bodyPage.Props["PostMessage"] = userLocale("api.post.send_notifications_and_forget.sent",
					map[string]interface{}{"Prefix": attachmentPrefix, "Filenames": filenamesString})
			}

			if err := utils.SendMail(profileMap[id].Email, subjectPage.Render(), bodyPage.Render()); err != nil {
				l4g.Error(utils.T("api.post.send_notifications_and_forget.send.error"), profileMap[id].Email, err)
			}

			if *utils.Cfg.EmailSettings.SendPushNotifications {
				sessionChan := Srv.Store.Session().GetSessions(id)
				if result := <-sessionChan; result.Err != nil {
					l4g.Error(utils.T("api.post.send_notifications_and_forget.sessions.error"), id, result.Err)
				} else {
					sessions := result.Data.([]*model.Session)
					alreadySeen := make(map[string]string)

					pushServer := *utils.Cfg.EmailSettings.PushNotificationServer
					if pushServer == model.MHPNS && (!utils.IsLicensed || !*utils.License.Features.MHPNS) {
						l4g.Warn(utils.T("api.post.send_notifications_and_forget.push_notification.mhpnsWarn"))

//.........这里部分代码省略.........
						continue
					}

					// skip if inactive
					if profileMap[id].DeleteAt > 0 {
						continue
					}

					bodyPage := NewServerTemplatePage("post_body")
					bodyPage.Props["SiteURL"] = siteURL
					bodyPage.Props["Nickname"] = profileMap[id].FirstName
					bodyPage.Props["TeamDisplayName"] = teamDisplayName
					bodyPage.Props["ChannelName"] = channelName
					bodyPage.Props["BodyText"] = bodyText
					bodyPage.Props["SenderName"] = senderName
					bodyPage.Props["Hour"] = fmt.Sprintf("%02d", tm.Hour())
					bodyPage.Props["Minute"] = fmt.Sprintf("%02d", tm.Minute())
					bodyPage.Props["Month"] = tm.Month().String()[:3]
					bodyPage.Props["Day"] = fmt.Sprintf("%d", tm.Day())
					bodyPage.Props["PostMessage"] = model.ClearMentionTags(post.Message)
					bodyPage.Props["TeamLink"] = teamURL + "/channels/" + channel.Name

					// attempt to fill in a message body if the post doesn't have any text
					if len(strings.TrimSpace(bodyPage.Props["PostMessage"])) == 0 && len(post.Filenames) > 0 {
						// extract the filenames from their paths and determine what type of files are attached
						filenames := make([]string, len(post.Filenames))
						onlyImages := true
						for i, filename := range post.Filenames {
							var err error
							if filenames[i], err = url.QueryUnescape(filepath.Base(filename)); err != nil {
								// this should never error since filepath was escaped using url.QueryEscape
								filenames[i] = filepath.Base(filename)
							}

							ext := filepath.Ext(filename)
							onlyImages = onlyImages && model.IsFileExtImage(ext)
						}
						filenamesString := strings.Join(filenames, ", ")

						var attachmentPrefix string
						if onlyImages {
							attachmentPrefix = "Image"
						} else {
							attachmentPrefix = "File"
						}
						if len(post.Filenames) > 1 {
							attachmentPrefix += "s"
						}

						bodyPage.Props["PostMessage"] = fmt.Sprintf("%s: %s sent", attachmentPrefix, filenamesString)
					}

					if err := utils.SendMail(profileMap[id].Email, subjectPage.Render(), bodyPage.Render()); err != nil {
						l4g.Error("Failed to send mention email successfully email=%v err=%v", profileMap[id].Email, err)
					}

					if len(utils.Cfg.EmailSettings.ApplePushServer) > 0 {
						sessionChan := Srv.Store.Session().GetSessions(id)
						if result := <-sessionChan; result.Err != nil {
							l4g.Error("Failed to retrieve sessions in notifications id=%v, err=%v", id, result.Err)
						} else {
							sessions := result.Data.([]*model.Session)
							alreadySeen := make(map[string]string)

							for _, session := range sessions {
								if len(session.DeviceId) > 0 && alreadySeen[session.DeviceId] == "" {

									alreadySeen[session.DeviceId] = session.DeviceId

									utils.FireAndForgetSendAppleNotify(session.DeviceId, subjectPage.Render(), 1)
								}
							}
						}
					}
				}
			}
		}

		message := model.NewMessage(teamId, post.ChannelId, post.UserId, model.ACTION_POSTED)
		message.Add("post", post.ToJson())

		if len(post.Filenames) != 0 {
			message.Add("otherFile", "true")

			for _, filename := range post.Filenames {
				ext := filepath.Ext(filename)
				if model.IsFileExtImage(ext) {
					message.Add("image", "true")
					break
				}
			}
		}

		if len(mentionedUsers) != 0 {
			message.Add("mentions", model.ArrayToJson(mentionedUsers))
		}

		PublishAndForget(message)
	}()
}

//.........这里部分代码省略.........
			}
		}
	}

	if hereNotification {
		if result := <-Srv.Store.Status().GetOnline(); result.Err != nil {
			l4g.Warn(utils.T("api.post.notification.here.warn"), result.Err)
			return
		} else {
			statuses := result.Data.([]*model.Status)
			for _, status := range statuses {
				if status.UserId == post.UserId {
					continue
				}

				_, profileFound := profileMap[status.UserId]
				_, isChannelMember := members[status.UserId]
				_, alreadyMentioned := mentionedUserIds[status.UserId]

				if status.Status == model.STATUS_ONLINE && profileFound && isChannelMember && !alreadyMentioned {
					mentionedUsersList = append(mentionedUsersList, status.UserId)
					updateMentionChans = append(updateMentionChans, Srv.Store.Channel().IncrementMentionCount(post.ChannelId, status.UserId))
				}
			}
		}
	}

	// Make sure all mention updates are complete to prevent race
	// Probably better to batch these DB updates in the future
	// MUST be completed before push notifications send
	for _, uchan := range updateMentionChans {
		if result := <-uchan; result.Err != nil {
			l4g.Warn(utils.T("api.post.update_mention_count_and_forget.update_error"), post.Id, post.ChannelId, result.Err)
		}
	}

	sendPushNotifications := false
	if *utils.Cfg.EmailSettings.SendPushNotifications {
		pushServer := *utils.Cfg.EmailSettings.PushNotificationServer
		if pushServer == model.MHPNS && (!utils.IsLicensed || !*utils.License.Features.MHPNS) {
			l4g.Warn(utils.T("api.post.send_notifications_and_forget.push_notification.mhpnsWarn"))
			sendPushNotifications = false
		} else {
			sendPushNotifications = true
		}
	}

	if sendPushNotifications {
		for _, id := range mentionedUsersList {
			var status *model.Status
			var err *model.AppError
			if status, err = GetStatus(id); err != nil {
				status = &model.Status{id, model.STATUS_OFFLINE, false, 0, ""}
			}

			if DoesStatusAllowPushNotification(profileMap[id], status, post.ChannelId) {
				sendPushNotification(post, profileMap[id], channel, senderName, true)
			}
		}

		for _, id := range allActivityPushUserIds {
			if _, ok := mentionedUserIds[id]; !ok {
				var status *model.Status
				var err *model.AppError
				if status, err = GetStatus(id); err != nil {
					status = &model.Status{id, model.STATUS_OFFLINE, false, 0, ""}
				}

				if DoesStatusAllowPushNotification(profileMap[id], status, post.ChannelId) {
					sendPushNotification(post, profileMap[id], channel, senderName, false)
				}
			}
		}
	}

	message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_POSTED, "", post.ChannelId, "", nil)
	message.Add("post", post.ToJson())
	message.Add("channel_type", channel.Type)
	message.Add("channel_display_name", channel.DisplayName)
	message.Add("sender_name", senderName)
	message.Add("team_id", team.Id)

	if len(post.Filenames) != 0 {
		message.Add("otherFile", "true")

		for _, filename := range post.Filenames {
			ext := filepath.Ext(filename)
			if model.IsFileExtImage(ext) {
				message.Add("image", "true")
				break
			}
		}
	}

	if len(mentionedUsersList) != 0 {
		message.Add("mentions", model.ArrayToJson(mentionedUsersList))
	}

	go Publish(message)
}

func sendNotificationEmail(c *Context, post *model.Post, user *model.User, channel *model.Channel, team *model.Team, senderName string) {
	// skip if inactive
	if user.DeleteAt > 0 {
		return
	}

	var channelName string
	var bodyText string
	var subjectText string

	teamURL := c.GetSiteURL() + "/" + team.Name
	tm := time.Unix(post.CreateAt/1000, 0)

	userLocale := utils.GetUserTranslations(user.Locale)

	if channel.Type == model.CHANNEL_DIRECT {
		bodyText = userLocale("api.post.send_notifications_and_forget.message_body")
		subjectText = userLocale("api.post.send_notifications_and_forget.message_subject")
		channelName = senderName
	} else {
		bodyText = userLocale("api.post.send_notifications_and_forget.mention_body")
		subjectText = userLocale("api.post.send_notifications_and_forget.mention_subject")
		channelName = channel.DisplayName
	}

	month := userLocale(tm.Month().String())
	day := fmt.Sprintf("%d", tm.Day())
	year := fmt.Sprintf("%d", tm.Year())
	zone, _ := tm.Zone()

	subjectPage := utils.NewHTMLTemplate("post_subject", user.Locale)
	subjectPage.Props["Subject"] = userLocale("api.templates.post_subject",
		map[string]interface{}{"SubjectText": subjectText, "TeamDisplayName": team.DisplayName,
			"Month": month[:3], "Day": day, "Year": year})
	subjectPage.Props["SiteName"] = utils.Cfg.TeamSettings.SiteName

	bodyPage := utils.NewHTMLTemplate("post_body", user.Locale)
	bodyPage.Props["SiteURL"] = c.GetSiteURL()
	bodyPage.Props["PostMessage"] = model.ClearMentionTags(post.Message)
	bodyPage.Props["TeamLink"] = teamURL + "/pl/" + post.Id
	bodyPage.Props["BodyText"] = bodyText
	bodyPage.Props["Button"] = userLocale("api.templates.post_body.button")
	bodyPage.Html["Info"] = template.HTML(userLocale("api.templates.post_body.info",
		map[string]interface{}{"ChannelName": channelName, "SenderName": senderName,
			"Hour": fmt.Sprintf("%02d", tm.Hour()), "Minute": fmt.Sprintf("%02d", tm.Minute()),
			"TimeZone": zone, "Month": month, "Day": day}))

	// attempt to fill in a message body if the post doesn't have any text
	if len(strings.TrimSpace(bodyPage.Props["PostMessage"])) == 0 && len(post.Filenames) > 0 {
		// extract the filenames from their paths and determine what type of files are attached
		filenames := make([]string, len(post.Filenames))
		onlyImages := true
		for i, filename := range post.Filenames {
			var err error
			if filenames[i], err = url.QueryUnescape(filepath.Base(filename)); err != nil {
				// this should never error since filepath was escaped using url.QueryEscape
				filenames[i] = filepath.Base(filename)
			}

			ext := filepath.Ext(filename)
			onlyImages = onlyImages && model.IsFileExtImage(ext)
		}
		filenamesString := strings.Join(filenames, ", ")

		var attachmentPrefix string
		if onlyImages {
			attachmentPrefix = "Image"
		} else {
			attachmentPrefix = "File"
		}
		if len(post.Filenames) > 1 {
			attachmentPrefix += "s"
		}

		bodyPage.Props["PostMessage"] = userLocale("api.post.send_notifications_and_forget.sent",
			map[string]interface{}{"Prefix": attachmentPrefix, "Filenames": filenamesString})
	}

	if err := utils.SendMail(user.Email, subjectPage.Render(), bodyPage.Render()); err != nil {
		l4g.Error(utils.T("api.post.send_notifications_and_forget.send.error"), user.Email, err)
	}
}

//.........这里部分代码省略.........

				for _, splitWord := range splitWords {
					// Non-case-sensitive check for regular keys
					if ids, match := keywordMap[strings.ToLower(splitWord)]; match {
						userIds = append(userIds, ids...)
					}

					// Case-sensitive check for first name
					if ids, match := keywordMap[splitWord]; match {
						userIds = append(userIds, ids...)
					}
				}
			}

			for _, userId := range userIds {
				if post.UserId == userId && post.Props["from_webhook"] != "true" {
					continue
				}

				mentionedUserIds[userId] = true
			}
		}

		for id := range mentionedUserIds {
			go updateMentionCount(post.ChannelId, id)
		}
	}

	mentionedUsersList := make([]string, 0, len(mentionedUserIds))

	senderName := ""
	if post.IsSystemMessage() {
		senderName = c.T("system.message.name")
	} else if profile, ok := profileMap[post.UserId]; ok {
		senderName = profile.Username
	}

	for id := range mentionedUserIds {
		mentionedUsersList = append(mentionedUsersList, id)
	}

	if utils.Cfg.EmailSettings.SendEmailNotifications {
		for _, id := range mentionedUsersList {
			userAllowsEmails := profileMap[id].NotifyProps["email"] != "false"

			if userAllowsEmails && (profileMap[id].IsAway() || profileMap[id].IsOffline()) {
				sendNotificationEmail(c, post, profileMap[id], channel, team, senderName)
			}
		}
	}

	sendPushNotifications := false
	if *utils.Cfg.EmailSettings.SendPushNotifications {
		pushServer := *utils.Cfg.EmailSettings.PushNotificationServer
		if pushServer == model.MHPNS && (!utils.IsLicensed || !*utils.License.Features.MHPNS) {
			l4g.Warn(utils.T("api.post.send_notifications_and_forget.push_notification.mhpnsWarn"))
			sendPushNotifications = false
		} else {
			sendPushNotifications = true
		}
	}

	if sendPushNotifications {
		for _, id := range mentionedUsersList {
			if profileMap[id].NotifyProps["push"] != "none" {
				sendPushNotification(post, profileMap[id], channel, senderName, true)
			}
		}
		for _, id := range alwaysNotifyUserIds {
			if _, ok := mentionedUserIds[id]; !ok {
				sendPushNotification(post, profileMap[id], channel, senderName, false)
			}
		}
	}

	message := model.NewMessage(c.TeamId, post.ChannelId, post.UserId, model.ACTION_POSTED)
	message.Add("post", post.ToJson())
	message.Add("channel_type", channel.Type)
	message.Add("channel_display_name", channel.DisplayName)
	message.Add("sender_name", senderName)
	message.Add("team_id", team.Id)

	if len(post.Filenames) != 0 {
		message.Add("otherFile", "true")

		for _, filename := range post.Filenames {
			ext := filepath.Ext(filename)
			if model.IsFileExtImage(ext) {
				message.Add("image", "true")
				break
			}
		}
	}

	if len(mentionedUsersList) != 0 {
		message.Add("mentions", model.ArrayToJson(mentionedUsersList))
	}

	go Publish(message)
}

//.........这里部分代码省略.........
					// skip if inactive
					if profileMap[id].DeleteAt > 0 {
						continue
					}

					bodyPage := NewServerTemplatePage("post_body")
					bodyPage.Props["SiteURL"] = c.GetSiteURL()
					bodyPage.Props["Nickname"] = profileMap[id].FirstName
					bodyPage.Props["TeamDisplayName"] = team.DisplayName
					bodyPage.Props["ChannelName"] = channelName
					bodyPage.Props["BodyText"] = bodyText
					bodyPage.Props["SenderName"] = senderName
					bodyPage.Props["Hour"] = fmt.Sprintf("%02d", tm.Hour())
					bodyPage.Props["Minute"] = fmt.Sprintf("%02d", tm.Minute())
					bodyPage.Props["Month"] = tm.Month().String()[:3]
					bodyPage.Props["Day"] = fmt.Sprintf("%d", tm.Day())
					bodyPage.Props["TimeZone"], _ = tm.Zone()
					bodyPage.Props["PostMessage"] = model.ClearMentionTags(post.Message)
					bodyPage.Props["TeamLink"] = teamURL + "/channels/" + channel.Name

					// attempt to fill in a message body if the post doesn't have any text
					if len(strings.TrimSpace(bodyPage.Props["PostMessage"])) == 0 && len(post.Filenames) > 0 {
						// extract the filenames from their paths and determine what type of files are attached
						filenames := make([]string, len(post.Filenames))
						onlyImages := true
						for i, filename := range post.Filenames {
							var err error
							if filenames[i], err = url.QueryUnescape(filepath.Base(filename)); err != nil {
								// this should never error since filepath was escaped using url.QueryEscape
								filenames[i] = filepath.Base(filename)
							}

							ext := filepath.Ext(filename)
							onlyImages = onlyImages && model.IsFileExtImage(ext)
						}
						filenamesString := strings.Join(filenames, ", ")

						var attachmentPrefix string
						if onlyImages {
							attachmentPrefix = "Image"
						} else {
							attachmentPrefix = "File"
						}
						if len(post.Filenames) > 1 {
							attachmentPrefix += "s"
						}

						bodyPage.Props["PostMessage"] = fmt.Sprintf("%s: %s sent", attachmentPrefix, filenamesString)
					}

					if err := utils.SendMail(profileMap[id].Email, subjectPage.Render(), bodyPage.Render()); err != nil {
						l4g.Error("Failed to send mention email successfully email=%v err=%v", profileMap[id].Email, err)
					}

					if *utils.Cfg.EmailSettings.SendPushNotifications {
						sessionChan := Srv.Store.Session().GetSessions(id)
						if result := <-sessionChan; result.Err != nil {
							l4g.Error("Failed to retrieve sessions in notifications id=%v, err=%v", id, result.Err)
						} else {
							sessions := result.Data.([]*model.Session)
							alreadySeen := make(map[string]string)

							for _, session := range sessions {
								if len(session.DeviceId) > 0 && alreadySeen[session.DeviceId] == "" && strings.HasPrefix(session.DeviceId, "apple:") {
									alreadySeen[session.DeviceId] = session.DeviceId

func uploadFile(c *Context, w http.ResponseWriter, r *http.Request) {
	if !utils.IsS3Configured() {
		c.Err = model.NewAppError("uploadFile", "Unable to upload file. Amazon S3 not configured. ", "")
		c.Err.StatusCode = http.StatusNotImplemented
		return
	}

	err := r.ParseMultipartForm(model.MAX_FILE_SIZE)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	var auth aws.Auth
	auth.AccessKey = utils.Cfg.AWSSettings.S3AccessKeyId
	auth.SecretKey = utils.Cfg.AWSSettings.S3SecretAccessKey

	s := s3.New(auth, aws.Regions[utils.Cfg.AWSSettings.S3Region])
	bucket := s.Bucket(utils.Cfg.AWSSettings.S3Bucket)

	m := r.MultipartForm

	props := m.Value

	if len(props["channel_id"]) == 0 {
		c.SetInvalidParam("uploadFile", "channel_id")
		return
	}
	channelId := props["channel_id"][0]
	if len(channelId) == 0 {
		c.SetInvalidParam("uploadFile", "channel_id")
		return
	}

	cchan := Srv.Store.Channel().CheckPermissionsTo(c.Session.TeamId, channelId, c.Session.UserId)

	files := m.File["files"]

	resStruct := &model.FileUploadResponse{
		Filenames: []string{}}

	imageNameList := []string{}
	imageDataList := [][]byte{}

	if !c.HasPermissionsToChannel(cchan, "uploadFile") {
		return
	}

	for i, _ := range files {
		file, err := files[i].Open()
		defer file.Close()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		buf := bytes.NewBuffer(nil)
		io.Copy(buf, file)

		ext := filepath.Ext(files[i].Filename)

		uid := model.NewId()

		path := "teams/" + c.Session.TeamId + "/channels/" + channelId + "/users/" + c.Session.UserId + "/" + uid + "/" + files[i].Filename

		if model.IsFileExtImage(ext) {
			options := s3.Options{}
			err = bucket.Put(path, buf.Bytes(), model.GetImageMimeType(ext), s3.Private, options)
			imageNameList = append(imageNameList, uid+"/"+files[i].Filename)
			imageDataList = append(imageDataList, buf.Bytes())
		} else {
			options := s3.Options{}
			err = bucket.Put(path, buf.Bytes(), "binary/octet-stream", s3.Private, options)
		}

		if err != nil {
			c.Err = model.NewAppError("uploadFile", "Unable to upload file. ", err.Error())
			return
		}

		fileUrl := c.TeamUrl + "/api/v1/files/get/" + channelId + "/" + c.Session.UserId + "/" + uid + "/" + url.QueryEscape(files[i].Filename)
		resStruct.Filenames = append(resStruct.Filenames, fileUrl)
	}

	fireAndForgetHandleImages(imageNameList, imageDataList, c.Session.TeamId, channelId, c.Session.UserId)

	w.Write([]byte(resStruct.ToJson()))
}

func getFileInfo(c *Context, w http.ResponseWriter, r *http.Request) {
	if len(utils.Cfg.FileSettings.DriverName) == 0 {
		c.Err = model.NewAppError("uploadFile", "Unable to get file info. Image storage is not configured.", "")
		c.Err.StatusCode = http.StatusNotImplemented
		return
	}

	params := mux.Vars(r)

	channelId := params["channel_id"]
	if len(channelId) != 26 {
		c.SetInvalidParam("getFileInfo", "channel_id")
		return
	}

	userId := params["user_id"]
	if len(userId) != 26 {
		c.SetInvalidParam("getFileInfo", "user_id")
		return
	}

	filename := params["filename"]
	if len(filename) == 0 {
		c.SetInvalidParam("getFileInfo", "filename")
		return
	}

	cchan := Srv.Store.Channel().CheckPermissionsTo(c.Session.TeamId, channelId, c.Session.UserId)

	path := "teams/" + c.Session.TeamId + "/channels/" + channelId + "/users/" + userId + "/" + filename
	size := ""

	if s, ok := fileInfoCache.Get(path); ok {
		size = s.(string)
	} else {

		fileData := make(chan []byte)
		getFileAndForget(path, fileData)

		f := <-fileData

		if f == nil {
			c.Err = model.NewAppError("getFileInfo", "Could not find file.", "path="+path)
			c.Err.StatusCode = http.StatusNotFound
			return
		}

		size = strconv.Itoa(len(f))
		fileInfoCache.Add(path, size)
	}

	if !c.HasPermissionsToChannel(cchan, "getFileInfo") {
		return
	}

	w.Header().Set("Cache-Control", "max-age=2592000, public")

	var mimeType string
	ext := filepath.Ext(filename)
	if model.IsFileExtImage(ext) {
		mimeType = model.GetImageMimeType(ext)
	} else {
		mimeType = mime.TypeByExtension(ext)
	}

	result := make(map[string]string)
	result["filename"] = filename
	result["size"] = size
	result["mime"] = mimeType
	w.Write([]byte(model.MapToJson(result)))
}