From d359d3ad996c53f89c0f908f25e0900c32c664d8 Mon Sep 17 00:00:00 2001
From: John Livingston <git@john-livingston.fr>
Date: Fri, 14 Apr 2023 11:25:29 +0200
Subject: [PATCH] Fix Prosody room topic:

Due to a bug in mod_muc_http_defaults (https://hg.prosody.im/prosody-modules/rev/6d99ddd99694),
room topics were badly configured. The plugin will fix them at startup, and stops trying to set the subject.
---
 CHANGELOG.md                           |  1 +
 server/lib/prosody/ctl.ts              |  7 ++++
 server/lib/prosody/fix-room-subject.ts | 56 ++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 server/lib/prosody/fix-room-subject.ts

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02c8a67f..21f3d334 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 * Diagnostic tool: add the result of `prosodyctl check` in the debug section.
 * New debug mode
+* Fix room topic: due to a [bug in mod_muc_http_defaults](https://hg.prosody.im/prosody-modules/rev/6d99ddd99694), room topics were badly configured. The plugin will fix them at startup, and stops trying to set the subject.
 
 ## 6.2.3
 
diff --git a/server/lib/prosody/ctl.ts b/server/lib/prosody/ctl.ts
index f5af9935..188d7988 100644
--- a/server/lib/prosody/ctl.ts
+++ b/server/lib/prosody/ctl.ts
@@ -5,6 +5,7 @@ import {
   ensureProsodyCertificates, startProsodyCertificatesRenewCheck, stopProsodyCertificatesRenewCheck
 } from './certificates'
 import { disableProxyRoute, enableProxyRoute } from '../routers/webchat'
+import { fixRoomSubject } from './fix-room-subject'
 import * as fs from 'fs'
 import * as child_process from 'child_process'
 
@@ -71,6 +72,12 @@ async function prepareProsody (options: RegisterServerOptions): Promise<void> {
     filePaths.appImageExtractPath
   )
 
+  try {
+    await fixRoomSubject(options, filePaths)
+  } catch (err) {
+    logger.error(err)
+  }
+
   const appImageToExtract = filePaths.appImageToExtract
   if (!appImageToExtract) {
     return
diff --git a/server/lib/prosody/fix-room-subject.ts b/server/lib/prosody/fix-room-subject.ts
new file mode 100644
index 00000000..482a5f92
--- /dev/null
+++ b/server/lib/prosody/fix-room-subject.ts
@@ -0,0 +1,56 @@
+import type { RegisterServerOptions } from '@peertube/peertube-types'
+import { ProsodyFilePaths } from './config/paths'
+import * as path from 'path'
+import * as fs from 'fs'
+
+/**
+ * Until plugin verstion 6.2.3, there where a bug in mod_muc_http_defaults
+ * that messed up room metadata. This bug is blocking for external XMPP account
+ * connections.
+ * This functions corrects room metadata if needed.
+ * @param options
+ * @param filePaths
+ */
+export async function fixRoomSubject (options: RegisterServerOptions, filePaths: ProsodyFilePaths): Promise<void> {
+  const logger = options.peertubeHelpers.logger
+  // When this scripts run the first time, it create a file, so that we can know if we need to run it again:
+  const doneFilePath = path.resolve(filePaths.dir, 'fix-room-done')
+  if (fs.existsSync(doneFilePath)) {
+    logger.debug('fixRoomSubject already runned.')
+    return
+  }
+
+  logger.info('Fixing Prosody room subjects...')
+
+  // Room data are in a folder named something like "room%2evideos%2edomain%2etld".
+  // There should only be one. But if you renamed your instance, it could be more than one.
+  // Just in case, we will loop on each folder with name beginning with "room%2e".
+  const folders = fs.readdirSync(filePaths.data, { withFileTypes: true }).filter(file => {
+    return file.isDirectory() && file.name.startsWith('room%2e')
+  })
+  folders.forEach(folder => {
+    // the folder must contain a «config» directory
+    const configDir = path.resolve(filePaths.data, folder.name, 'config')
+    if (!fs.existsSync(configDir)) { return }
+    const roomDataFiles = fs.readdirSync(configDir, { withFileTypes: true }).filter(file => {
+      return file.isFile() && file.name.endsWith('.dat')
+    })
+    roomDataFiles.forEach(file => {
+      logger.debug('Checking room ' + file.name + ' subject')
+      const filepath = path.resolve(configDir, file.name)
+      let content = fs.readFileSync(filepath).toString()
+      // To detect wrongly configured files, we just check if there is a "subject_from" and no "subject" key.
+      // Indeed, the bug was that mod_muc_http_defaults set subject_from (which should be a jid) to the subject, and
+      // did not set any subject.
+      // See https://hg.prosody.im/prosody-modules/rev/6d99ddd99694
+      if (content.includes('["subject_from"]') && !content.includes('["subject"]')) {
+        logger.info('We must fix room ' + file.name + ' by removing subject_from')
+        content = content.replace(/^\s*\["subject_from"\]\s*=.*;\s*$/gm, '')
+        content = content.replace(/^\s*\["subject_time"\]\s*=.*;\s*$/gm, '')
+        fs.writeFileSync(filepath, content)
+      }
+    })
+  })
+
+  fs.writeFileSync(doneFilePath, '')
+}