Implement channel history clearing on the server

src/client.js

@@ -501,6 +501,28 @@ Client.prototype.more = function(data) {
 	};
 };
 
+Client.prototype.clearHistory = function(data) {
+	const client = this;
+	const target = client.find(data.target);
+
+	if (!target) {
+		return;
+	}
+
+	target.chan.messages = [];
+	target.chan.unread = 0;
+	target.chan.highlight = 0;
+	target.chan.firstUnread = 0;
+
+	if (!target.chan.isLoggable()) {
+		return;
+	}
+
+	for (const messageStorage of this.messageStorage) {
+		messageStorage.deleteChannel(target.network, target.chan);
+	}
+};
+
 Client.prototype.open = function(socketId, target) {
 	// Due to how socket.io works internally, normal events may arrive later than
 	// the disconnect event, and because we can't control this timing precisely,

src/plugins/messageStorage/sqlite.js

@@ -144,6 +144,20 @@ class MessageStorage {
 		);
 	}
 
+	deleteChannel(network, channel) {
+		if (!this.isEnabled) {
+			return;
+		}
+
+		this.database.serialize(() =>
+			this.database.run(
+				"DELETE FROM messages WHERE network = ? AND channel = ?",
+				network.uuid,
+				channel.name.toLowerCase()
+			)
+		);
+	}
+
 	/**
 	 * Load messages for given channel on a given network and resolve a promise with loaded messages.
 	 *

src/plugins/messageStorage/text.js

@@ -100,11 +100,35 @@ class TextFileMessageStorage {
 
 		line += "\n";
 
-		fs.appendFile(path.join(logPath, `${cleanFilename(channel.name)}.log`), line, (e) => {
-			if (e) {
-				log.error("Failed to write user log", e);
+		fs.appendFile(
+			path.join(logPath, TextFileMessageStorage.getChannelFileName(channel)),
+			line,
+			(e) => {
+				if (e) {
+					log.error("Failed to write user log", e);
+				}
 			}
-		});
+		);
+	}
+
+	deleteChannel() {
+		/* TODO: Truncating text logs is disabled, until we figure out some UI for it
+		if (!this.isEnabled) {
+			return;
+		}
+
+		const logPath = path.join(
+			Helper.getUserLogsPath(),
+			this.client.name,
+			TextFileMessageStorage.getNetworkFolderName(network),
+			TextFileMessageStorage.getChannelFileName(channel)
+		);
+
+		fs.truncate(logPath, 0, (e) => {
+			if (e) {
+				log.error("Failed to truncate user log", e);
+			}
+		});*/
 	}
 
 	getMessages() {
@@ -125,6 +149,10 @@ class TextFileMessageStorage {
 
 		return `${networkName}-${network.uuid.substring(networkName.length + 1)}`;
 	}
+
+	static getChannelFileName(channel) {
+		return `${cleanFilename(channel.name)}.log`;
+	}
 }
 
 module.exports = TextFileMessageStorage;

src/server.js

@@ -420,6 +420,12 @@ function initializeClient(socket, client, token, lastMessage, openChannel) {
 		network.edit(client, data);
 	});
 
+	socket.on("history:clear", (data) => {
+		if (typeof data === "object") {
+			client.clearHistory(data);
+		}
+	});
+
 	if (!Helper.config.public && !Helper.config.ldap.enable) {
 		socket.on("change-password", (data) => {
 			if (typeof data === "object") {