MM-19337 Enable users to view archived channels (#12995)

* First pass at searching archived channels

* Create endpoint for archived channels

* Update test for GetPublicChannelsForTeam

* Fix unit test for archived channels

* Rename includeDeleted to onlyDeleted

* Remove new /archived endpoint in favour of existing /deleted endpoint

* Fix broken test

* Remove manage team permission from /deleted endpoint

* Fix deletedChannels test

* Test for searching archived channels

* Only return private deleted channels user was a member of

* SearchArchivedChannels also searches private channels (user is a member of)

* Remove for loop to simplify append

* Remove userId from Client4 searcArchivedChannels

api4/channel.go

@@ -27,6 +27,7 @@ func (api *API) InitChannel() {
 	api.BaseRoutes.ChannelsForTeam.Handle("/deleted", api.ApiSessionRequired(getDeletedChannelsForTeam)).Methods("GET")
 	api.BaseRoutes.ChannelsForTeam.Handle("/ids", api.ApiSessionRequired(getPublicChannelsByIdsForTeam)).Methods("POST")
 	api.BaseRoutes.ChannelsForTeam.Handle("/search", api.ApiSessionRequired(searchChannelsForTeam)).Methods("POST")
+	api.BaseRoutes.ChannelsForTeam.Handle("/search_archived", api.ApiSessionRequired(searchArchivedChannelsForTeam)).Methods("POST")
 	api.BaseRoutes.ChannelsForTeam.Handle("/autocomplete", api.ApiSessionRequired(autocompleteChannelsForTeam)).Methods("GET")
 	api.BaseRoutes.ChannelsForTeam.Handle("/search_autocomplete", api.ApiSessionRequired(autocompleteChannelsForTeamForSearch)).Methods("GET")
 	api.BaseRoutes.User.Handle("/teams/{team_id:[A-Za-z0-9]+}/channels", api.ApiSessionRequired(getChannelsForTeamForUser)).Methods("GET")
@@ -681,12 +682,7 @@ func getDeletedChannelsForTeam(c *Context, w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	if !c.App.SessionHasPermissionToTeam(c.App.Session, c.Params.TeamId, model.PERMISSION_MANAGE_TEAM) {
-		c.SetPermissionError(model.PERMISSION_MANAGE_TEAM)
-		return
-	}
-
-	channels, err := c.App.GetDeletedChannels(c.Params.TeamId, c.Params.Page*c.Params.PerPage, c.Params.PerPage)
+	channels, err := c.App.GetDeletedChannels(c.Params.TeamId, c.Params.Page*c.Params.PerPage, c.Params.PerPage, c.App.Session.UserId)
 	if err != nil {
 		c.Err = err
 		return
@@ -860,6 +856,42 @@ func searchChannelsForTeam(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(channels.ToJson()))
 }
 
+func searchArchivedChannelsForTeam(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireTeamId()
+	if c.Err != nil {
+		return
+	}
+
+	props := model.ChannelSearchFromJson(r.Body)
+	if props == nil {
+		c.SetInvalidParam("channel_search")
+		return
+	}
+
+	var channels *model.ChannelList
+	var err *model.AppError
+	if c.App.SessionHasPermissionToTeam(c.App.Session, c.Params.TeamId, model.PERMISSION_LIST_TEAM_CHANNELS) {
+		channels, err = c.App.SearchArchivedChannels(c.Params.TeamId, props.Term, c.App.Session.UserId)
+	} else {
+		// If the user is not a team member, return a 404
+		if _, err = c.App.GetTeamMember(c.Params.TeamId, c.App.Session.UserId); err != nil {
+			c.Err = err
+			return
+		}
+
+		channels, err = c.App.SearchArchivedChannels(c.Params.TeamId, props.Term, c.App.Session.UserId)
+	}
+
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	// Don't fill in channels props, since unused by client and potentially expensive.
+
+	w.Write([]byte(channels.ToJson()))
+}
+
 func searchAllChannels(c *Context, w http.ResponseWriter, r *http.Request) {
 	props := model.ChannelSearchFromJson(r.Body)
 	if props == nil {