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58 lines
1.7 KiB
JavaScript
58 lines
1.7 KiB
JavaScript
'use strict';
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var async = require('async');
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var db = require('../database');
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var diff = require('diff');
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module.exports = function (Posts) {
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Posts.diffs = {};
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Posts.diffs.exists = function (pid, callback) {
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db.sortedSetCard('post:' + pid + ':diffs', function (err, numDiffs) {
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return callback(err, numDiffs > 0);
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});
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};
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Posts.diffs.list = function (pid, callback) {
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db.getSortedSetRangeWithScores('post:' + pid + ':diffs', 0, -1, function (err, diffs) {
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callback(err, diffs ? diffs.map(function (diffObj) {
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return diffObj.score;
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}) : null);
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});
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};
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Posts.diffs.save = function (pid, oldContent, newContent, callback) {
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db.sortedSetAdd('post:' + pid + ':diffs', Date.now(), diff.createPatch('', newContent, oldContent), callback);
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};
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Posts.diffs.load = function (pid, since, callback) {
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// Retrieves all diffs made since `since` and replays them to reconstruct what the post looked like at `since`
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since = parseInt(since, 10);
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if (isNaN(since) || since > Date.now()) {
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return callback(new Error('[[error:invalid-data]]'));
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}
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async.parallel({
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post: async.apply(Posts.getPostData, pid),
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diffs: async.apply(db.getSortedSetRangeByScore.bind(db), 'post:' + pid + ':diffs', 0, -1, since, Date.now()),
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}, function (err, data) {
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if (err) {
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return callback(err);
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}
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// Replace content with re-constructed content from that point in time
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data.post.content = data.diffs.reverse().reduce(function (content, diffString) {
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return diff.applyPatch(content, diffString);
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}, data.post.content);
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// Clear editor data (as it is outdated for this content)
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delete data.post.edited;
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data.post.editor = null;
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return callback(null, data.post);
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});
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};
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};
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