Fix user autocomplete with special characters (#4373)

store/sql_user_store.go

@@ -1196,15 +1196,36 @@ func (us SqlUserStore) SearchInChannel(channelId string, term string, searchType
 func (us SqlUserStore) performSearch(searchQuery string, term string, searchType string, parameters map[string]interface{}) StoreResult {
 	result := StoreResult{}
 
+	// these chars have special meaning and can be treated as spaces
+	for _, c := range specialSearchChar {
+		term = strings.Replace(term, c, " ", -1)
+	}
+
 	if term == "" {
 		searchQuery = strings.Replace(searchQuery, "SEARCH_CLAUSE", "", 1)
 	} else if utils.Cfg.SqlSettings.DriverName == model.DATABASE_DRIVER_POSTGRES {
-		term = term + ":*"
+		splitTerm := strings.Fields(term)
+		for i, t := range strings.Fields(term) {
+			if i == len(splitTerm)-1 {
+				splitTerm[i] = t + ":*"
+			} else {
+				splitTerm[i] = t + ":* &"
+			}
+		}
+
+		term = strings.Join(splitTerm, " ")
+
 		searchType = convertMySQLFullTextColumnsToPostgres(searchType)
 		searchClause := fmt.Sprintf("AND (%s) @@  to_tsquery(:Term)", searchType)
 		searchQuery = strings.Replace(searchQuery, "SEARCH_CLAUSE", searchClause, 1)
 	} else if utils.Cfg.SqlSettings.DriverName == model.DATABASE_DRIVER_MYSQL {
-		term = term + "*"
+		splitTerm := strings.Fields(term)
+		for i, t := range strings.Fields(term) {
+			splitTerm[i] = "+" + t + "*"
+		}
+
+		term = strings.Join(splitTerm, " ")
+
 		searchClause := fmt.Sprintf("AND MATCH(%s) AGAINST (:Term IN BOOLEAN MODE)", searchType)
 		searchQuery = strings.Replace(searchQuery, "SEARCH_CLAUSE", searchClause, 1)
 	}