PLT-4403 Add server-based channel autocomplete, search and paging (#4585)

* Add more channel paging API

* Add channel paging support to client

* Add DB channel search functions

* Add API for searching more channels

* Add more channel search functionality to client

* Add API for autocompleting channels

* Add channel autocomplete functionality to the client

* Move to be deprecated APIs to their own file

* Final clean-up

* Fixes related to feedback

* Localization changes

* Add unit as suffix to timeout constants

api/deprecated.go

@@ -0,0 +1,39 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api
+
+import (
+	"net/http"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+)
+
+// ONLY FOR APIs SCHEDULED TO BE DEPRECATED
+
+func InitDeprecated() {
+	l4g.Debug(utils.T("api.channel.init.debug"))
+
+	BaseRoutes.Channels.Handle("/more", ApiUserRequired(getMoreChannels)).Methods("GET") // SCHEDULED FOR DEPRECATION IN 3.7
+}
+
+func getMoreChannels(c *Context, w http.ResponseWriter, r *http.Request) {
+
+	// user is already in the team
+	if !HasPermissionToTeamContext(c, c.TeamId, model.PERMISSION_LIST_TEAM_CHANNELS) {
+		return
+	}
+
+	if result := <-Srv.Store.Channel().GetMoreChannels(c.TeamId, c.Session.UserId, 0, 100000); result.Err != nil {
+		c.Err = result.Err
+		return
+	} else if HandleEtag(result.Data.(*model.ChannelList).Etag(), w, r) {
+		return
+	} else {
+		data := result.Data.(*model.ChannelList)
+		w.Header().Set(model.HEADER_ETAG_SERVER, data.Etag())
+		w.Write([]byte(data.ToJson()))
+	}
+}