pad.pub0.org/bin/rebuildPad.js

90 lines
3.3 KiB
JavaScript

'use strict';
/*
This is a repair tool. It rebuilds an old pad at a new pad location up to a
known "good" revision.
*/
// As of v14, Node.js does not exit when there is an unhandled Promise rejection. Convert an
// unhandled rejection into an uncaught exception, which does cause Node.js to exit.
process.on('unhandledRejection', (err) => { throw err; });
if (process.argv.length !== 4 && process.argv.length !== 5) {
throw new Error('Use: node bin/repairPad.js $PADID $REV [$NEWPADID]');
}
const npm = require('ep_etherpad-lite/node_modules/npm');
const util = require('util');
const padId = process.argv[2];
const newRevHead = process.argv[3];
const newPadId = process.argv[4] || `${padId}-rebuilt`;
(async () => {
await util.promisify(npm.load)({});
const db = require('ep_etherpad-lite/node/db/DB');
await db.init();
const PadManager = require('ep_etherpad-lite/node/db/PadManager');
const Pad = require('ep_etherpad-lite/node/db/Pad').Pad;
// Validate the newPadId if specified and that a pad with that ID does
// not already exist to avoid overwriting it.
if (!PadManager.isValidPadId(newPadId)) {
throw new Error('Cannot create a pad with that id as it is invalid');
}
const exists = await PadManager.doesPadExist(newPadId);
if (exists) throw new Error('Cannot create a pad with that id as it already exists');
const oldPad = await PadManager.getPad(padId);
const newPad = new Pad(newPadId);
// Clone all Chat revisions
const chatHead = oldPad.chatHead;
await Promise.all([...Array(chatHead + 1).keys()].map(async (i) => {
const chat = await db.get(`pad:${padId}:chat:${i}`);
await db.set(`pad:${newPadId}:chat:${i}`, chat);
console.log(`Created: Chat Revision: pad:${newPadId}:chat:${i}`);
}));
// Rebuild Pad from revisions up to and including the new revision head
const AuthorManager = require('ep_etherpad-lite/node/db/AuthorManager');
const Changeset = require('ep_etherpad-lite/static/js/Changeset');
// Author attributes are derived from changesets, but there can also be
// non-author attributes with specific mappings that changesets depend on
// and, AFAICT, cannot be recreated any other way
newPad.pool.numToAttrib = oldPad.pool.numToAttrib;
for (let curRevNum = 0; curRevNum <= newRevHead; curRevNum++) {
const rev = await db.get(`pad:${padId}:revs:${curRevNum}`);
if (!rev || !rev.meta) throw new Error('The specified revision number could not be found.');
const newRevNum = ++newPad.head;
const newRevId = `pad:${newPad.id}:revs:${newRevNum}`;
await Promise.all([
db.set(newRevId, rev),
AuthorManager.addPad(rev.meta.author, newPad.id),
]);
newPad.atext = Changeset.applyToAText(rev.changeset, newPad.atext, newPad.pool);
console.log(`Created: Revision: pad:${newPad.id}:revs:${newRevNum}`);
}
// Add saved revisions up to the new revision head
console.log(newPad.head);
const newSavedRevisions = [];
for (const savedRev of oldPad.savedRevisions) {
if (savedRev.revNum <= newRevHead) {
newSavedRevisions.push(savedRev);
console.log(`Added: Saved Revision: ${savedRev.revNum}`);
}
}
newPad.savedRevisions = newSavedRevisions;
// Save the source pad
await db.set(`pad:${newPadId}`, newPad);
console.log(`Created: Source Pad: pad:${newPadId}`);
await newPad.saveToDatabase();
await db.shutdown();
console.info('finished');
})();