Add chathistory message.

README.PROTOCOL

@@ -277,6 +277,10 @@ if the message was originated by a client with the `op` permission.  The
 field `noecho` is set by the client if it doesn't wish to receive a copy
 of its own message.
 
+The `chathistory` message is similar to the `chat` message, but carries
+a message taken from the chat history.  Most clients should treat
+`chathistory` similarly to `chat`.
+
 A user message is similar to a chat message, but is not conserved in the
 chat history, and is not expected to contain user-visible content.
 

rtpconn/webclient.go

@@ -1351,7 +1351,7 @@ func handleClientMessage(c *webClient, m clientMessage) error {
 		h := c.group.GetChatHistory()
 		for _, m := range h {
 			err := c.write(clientMessage{
-				Type:     "chat",
+				Type:     "chathistory",
 				Id:       m.Id,
 				Username: m.User,
 				Time:     m.Time,

static/galene.js

@@ -2301,12 +2301,15 @@ let lastMessage = {};
 
 /**
  * @param {string} peerId
+ * @param {string} dest
  * @param {string} nick
  * @param {number} time
+ * @param {boolean} privileged
+ * @param {boolean} history
  * @param {string} kind
  * @param {unknown} message
  */
-function addToChatbox(peerId, dest, nick, time, privileged, kind, message) {
+function addToChatbox(peerId, dest, nick, time, privileged, history, kind, message) {
     let userpass = getUserPass();
     let row = document.createElement('div');
     row.classList.add('message-row');
@@ -2633,7 +2636,7 @@ commands.msg = {
             throw new Error(`Unknown user ${p[0]}`);
         serverConnection.chat('', id, p[1]);
         addToChatbox(serverConnection.id, id, serverConnection.username,
-                     Date.now(), false, '', p[1]);
+                     Date.now(), false, false, '', p[1]);
     }
 };
 

static/protocol.js

@@ -178,7 +178,7 @@ function ServerConnection() {
     /**
      * onchat is called whenever a new chat message is received.
      *
-     * @type {(this: ServerConnection, id: string, dest: string, username: string, time: number, privileged: boolean, kind: string, message: unknown) => void}
+     * @type {(this: ServerConnection, id: string, dest: string, username: string, time: number, privileged: boolean, history: boolean, kind: string, message: unknown) => void}
      */
     this.onchat = null;
     /**
@@ -379,10 +379,11 @@ ServerConnection.prototype.connect = async function(url) {
                     sc.onuser.call(sc, m.id, m.kind);
                 break;
             case 'chat':
+            case 'chathistory':
                 if(sc.onchat)
                     sc.onchat.call(
-                        sc, m.source, m.dest, m.username, m.time,
-                        m.privileged, m.kind, m.value,
+                        sc, m.source, m.dest, m.username, m.time, m.privileged,
+                        m.type === 'chathistory', m.kind, m.value,
                     );
                 break;
             case 'usermessage':