Implement POST /users/search endpoint for APIv4 (#5822)

* Implement POST /users/search endpoint for APIv4

* PLT-2713 Added store functions for searching users that don't have a team

* PLT-2713 Added 'without_team' option when searching users

* PLT-2713 Added 'without_team' option when searching users (v4)

api4/user.go

@@ -21,6 +21,7 @@ func InitUser() {
 	BaseRoutes.Users.Handle("", ApiHandler(createUser)).Methods("POST")
 	BaseRoutes.Users.Handle("", ApiSessionRequired(getUsers)).Methods("GET")
 	BaseRoutes.Users.Handle("/ids", ApiSessionRequired(getUsersByIds)).Methods("POST")
+	BaseRoutes.Users.Handle("/search", ApiSessionRequired(searchUsers)).Methods("POST")
 	BaseRoutes.Users.Handle("/autocomplete", ApiSessionRequired(autocompleteUsers)).Methods("GET")
 
 	BaseRoutes.User.Handle("", ApiSessionRequired(getUser)).Methods("GET")
@@ -334,6 +335,62 @@ func getUsersByIds(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func searchUsers(c *Context, w http.ResponseWriter, r *http.Request) {
+	props := model.UserSearchFromJson(r.Body)
+	if props == nil {
+		c.SetInvalidParam("")
+		return
+	}
+
+	if len(props.Term) == 0 {
+		c.SetInvalidParam("term")
+		return
+	}
+
+	if props.TeamId == "" && props.NotInChannelId != "" {
+		c.SetInvalidParam("team_id")
+		return
+	}
+
+	if props.InChannelId != "" && !app.SessionHasPermissionToChannel(c.Session, props.InChannelId, model.PERMISSION_READ_CHANNEL) {
+		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		return
+	}
+
+	if props.NotInChannelId != "" && !app.SessionHasPermissionToChannel(c.Session, props.NotInChannelId, model.PERMISSION_READ_CHANNEL) {
+		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		return
+	}
+
+	if props.TeamId != "" && !app.SessionHasPermissionToTeam(c.Session, props.TeamId, model.PERMISSION_VIEW_TEAM) {
+		c.SetPermissionError(model.PERMISSION_VIEW_TEAM)
+		return
+	}
+
+	searchOptions := map[string]bool{}
+	searchOptions[store.USER_SEARCH_OPTION_ALLOW_INACTIVE] = props.AllowInactive
+
+	if !app.SessionHasPermissionTo(c.Session, model.PERMISSION_MANAGE_SYSTEM) {
+		hideFullName := !utils.Cfg.PrivacySettings.ShowFullName
+		hideEmail := !utils.Cfg.PrivacySettings.ShowEmailAddress
+
+		if hideFullName && hideEmail {
+			searchOptions[store.USER_SEARCH_OPTION_NAMES_ONLY_NO_FULL_NAME] = true
+		} else if hideFullName {
+			searchOptions[store.USER_SEARCH_OPTION_ALL_NO_FULL_NAME] = true
+		} else if hideEmail {
+			searchOptions[store.USER_SEARCH_OPTION_NAMES_ONLY] = true
+		}
+	}
+
+	if profiles, err := app.SearchUsers(props, searchOptions, c.IsSystemAdmin()); err != nil {
+		c.Err = err
+		return
+	} else {
+		w.Write([]byte(model.UserListToJson(profiles)))
+	}
+}
+
 func autocompleteUsers(c *Context, w http.ResponseWriter, r *http.Request) {
 	channelId := r.URL.Query().Get("in_channel")
 	teamId := r.URL.Query().Get("in_team")