server: also modify torrent file on "Set Tracker"

package-lock.json

@@ -3298,6 +3298,14 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "bencode": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/bencode/-/bencode-2.0.1.tgz",
+      "integrity": "sha512-2uhEl8FdjSBUyb69qDTgOEeeqDTa+n3yMQzLW0cOzNf1Ow5bwcg3idf+qsWisIKRH8Bk8oC7UXL8irRcPA8ZEQ==",
+      "requires": {
+        "safe-buffer": "^5.1.1"
+      }
+    },
     "big.js": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",

package.json

@@ -49,6 +49,7 @@
     "axios": "^0.20.0",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^8.0.6",
+    "bencode": "^2.0.1",
     "body-parser": "^1.18.3",
     "case-sensitive-paths-webpack-plugin": "2.3.0",
     "chalk": "^4.1.0",

server/constants/torrentListPropMap.js

@@ -249,4 +249,9 @@ torrentListPropMap.set('peersTotal', {
   transformValue: (value) => Number(value.substr(0, value.indexOf('|||'))),
 });
 
+torrentListPropMap.set('session', {
+  methodCall: 'cat=(session.path), (d.hash)',
+  transformValue: defaultTransformer,
+});
+
 module.exports = torrentListPropMap;

server/models/client.js

@@ -10,6 +10,7 @@ const fileUtil = require('../util/fileUtil');
 const settings = require('./settings');
 const torrentFilePropsMap = require('../../shared/constants/torrentFilePropsMap');
 const torrentPeerPropsMap = require('../../shared/constants/torrentPeerPropsMap');
+const torrentFileUtil = require('../util/torrentFileUtil');
 const torrentStatusMap = require('../../shared/constants/torrentStatusMap');
 const torrentTrackerPropsMap = require('../../shared/constants/torrentTrackerPropsMap');
 
@@ -385,6 +386,9 @@ const client = {
 
     request.setTracker(data);
     request.onComplete((response, error) => {
+      // Modify tracker URL in torrent files
+      torrentFileUtil.setTracker(services, data);
+
       // Fetch the latest torrent list to re-index trackerURI.
       services.torrentService.fetchTorrentList();
       callback(response, error);

server/util/torrentFileUtil.js

@@ -0,0 +1,29 @@
+const bencode = require('bencode');
+const fs = require('fs');
+
+const setTracker = (services, options) => {
+  const {tracker, hashes} = options;
+
+  [...new Set(hashes)].forEach((hash) => {
+    const torrent = services.torrentService.getTorrent(hash).session.concat('.torrent');
+    fs.readFile(torrent, (err, data) => {
+      if (err) {
+        return;
+      }
+
+      const torrentData = bencode.decode(data);
+
+      if (torrentData.announce != null) {
+        torrentData.announce = Buffer.from(tracker);
+
+        fs.writeFileSync(torrent, bencode.encode(torrentData));
+      }
+    });
+  });
+};
+
+const torrentFileUtil = {
+  setTracker,
+};
+
+module.exports = torrentFileUtil;