mirror of
https://github.com/laurent22/joplin.git
synced 2024-12-27 10:32:58 +02:00
259 lines
8.3 KiB
JavaScript
259 lines
8.3 KiB
JavaScript
const BaseModel = require('lib/BaseModel.js');
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const BaseItem = require('lib/models/BaseItem.js');
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const DiffMatchPatch = require('diff-match-patch');
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const ArrayUtils = require('lib/ArrayUtils.js');
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const JoplinError = require('lib/JoplinError');
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const { sprintf } = require('sprintf-js');
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const dmp = new DiffMatchPatch();
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class Revision extends BaseItem {
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static tableName() {
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return 'revisions';
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}
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static modelType() {
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return BaseModel.TYPE_REVISION;
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}
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static createTextPatch(oldText, newText) {
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return dmp.patch_toText(dmp.patch_make(oldText, newText));
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}
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static applyTextPatch(text, patch) {
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patch = dmp.patch_fromText(patch);
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const result = dmp.patch_apply(patch, text);
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if (!result || !result.length) throw new Error('Could not apply patch');
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return result[0];
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}
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static createObjectPatch(oldObject, newObject) {
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if (!oldObject) oldObject = {};
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const output = {
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new: {},
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deleted: [],
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};
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for (const k in newObject) {
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if (!newObject.hasOwnProperty(k)) continue;
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if (oldObject[k] === newObject[k]) continue;
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output.new[k] = newObject[k];
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}
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for (const k in oldObject) {
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if (!oldObject.hasOwnProperty(k)) continue;
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if (!(k in newObject)) output.deleted.push(k);
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}
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return JSON.stringify(output);
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}
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static applyObjectPatch(object, patch) {
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patch = JSON.parse(patch);
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const output = Object.assign({}, object);
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for (const k in patch.new) {
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output[k] = patch.new[k];
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}
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for (let i = 0; i < patch.deleted.length; i++) {
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delete output[patch.deleted[i]];
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}
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return output;
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}
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static patchStats(patch) {
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if (typeof patch === 'object') throw new Error('Not implemented');
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const countChars = diffLine => {
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return unescape(diffLine).length - 1;
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};
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const lines = patch.split('\n');
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let added = 0;
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let removed = 0;
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for (const line of lines) {
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if (line.indexOf('-') === 0) {
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removed += countChars(line);
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continue;
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}
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if (line.indexOf('+') === 0) {
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added += countChars(line);
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continue;
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}
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}
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return {
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added: added,
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removed: removed,
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};
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}
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static revisionPatchStatsText(rev) {
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const titleStats = this.patchStats(rev.title_diff);
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const bodyStats = this.patchStats(rev.body_diff);
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const total = {
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added: titleStats.added + bodyStats.added,
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removed: titleStats.removed + bodyStats.removed,
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};
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const output = [];
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if (total.removed) output.push(`-${total.removed}`);
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output.push(`+${total.added}`);
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return output.join(', ');
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}
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static async countRevisions(itemType, itemId) {
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const r = await this.db().selectOne('SELECT count(*) as total FROM revisions WHERE item_type = ? AND item_id = ?', [itemType, itemId]);
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return r ? r.total : 0;
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}
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static latestRevision(itemType, itemId) {
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return this.modelSelectOne('SELECT * FROM revisions WHERE item_type = ? AND item_id = ? ORDER BY item_updated_time DESC LIMIT 1', [itemType, itemId]);
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}
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static allByType(itemType, itemId) {
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return this.modelSelectAll('SELECT * FROM revisions WHERE item_type = ? AND item_id = ? ORDER BY item_updated_time ASC', [itemType, itemId]);
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}
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static async itemsWithRevisions(itemType, itemIds) {
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if (!itemIds.length) return [];
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const rows = await this.db().selectAll(`SELECT distinct item_id FROM revisions WHERE item_type = ? AND item_id IN ("${itemIds.join('","')}")`, [itemType]);
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return rows.map(r => r.item_id);
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}
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static async itemsWithNoRevisions(itemType, itemIds) {
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const withRevs = await this.itemsWithRevisions(itemType, itemIds);
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const output = [];
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for (let i = 0; i < itemIds.length; i++) {
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if (withRevs.indexOf(itemIds[i]) < 0) output.push(itemIds[i]);
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}
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return ArrayUtils.unique(output);
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}
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static moveRevisionToTop(revision, revs) {
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let targetIndex = -1;
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for (let i = revs.length - 1; i >= 0; i--) {
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const rev = revs[i];
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if (rev.id === revision.id) {
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targetIndex = i;
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break;
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}
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}
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if (targetIndex < 0) throw new Error(`Could not find revision: ${revision.id}`);
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if (targetIndex !== revs.length - 1) {
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revs = revs.slice();
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const toTop = revs[targetIndex];
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revs.splice(targetIndex, 1);
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revs.push(toTop);
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}
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return revs;
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}
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// Note: revs must be sorted by update_time ASC (as returned by allByType)
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static async mergeDiffs(revision, revs = null) {
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if (!('encryption_applied' in revision) || !!revision.encryption_applied) throw new JoplinError('Target revision is encrypted', 'revision_encrypted');
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if (!revs) {
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revs = await this.modelSelectAll('SELECT * FROM revisions WHERE item_type = ? AND item_id = ? AND item_updated_time <= ? ORDER BY item_updated_time ASC', [revision.item_type, revision.item_id, revision.item_updated_time]);
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} else {
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revs = revs.slice();
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}
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// Handle rare case where two revisions have been created at exactly the same millisecond
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// Also handle even rarer case where a rev and its parent have been created at the
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// same milliseconds. All code below expects target revision to be on top.
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revs = this.moveRevisionToTop(revision, revs);
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const output = {
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title: '',
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body: '',
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metadata: {},
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};
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// Build up the list of revisions that are parents of the target revision.
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const revIndexes = [revs.length - 1];
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let parentId = revision.parent_id;
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for (let i = revs.length - 2; i >= 0; i--) {
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const rev = revs[i];
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if (rev.id !== parentId) continue;
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parentId = rev.parent_id;
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revIndexes.push(i);
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}
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revIndexes.reverse();
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for (const revIndex of revIndexes) {
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const rev = revs[revIndex];
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if (rev.encryption_applied) throw new JoplinError(sprintf('Revision "%s" is encrypted', rev.id), 'revision_encrypted');
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output.title = this.applyTextPatch(output.title, rev.title_diff);
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output.body = this.applyTextPatch(output.body, rev.body_diff);
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output.metadata = this.applyObjectPatch(output.metadata, rev.metadata_diff);
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}
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return output;
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}
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static async deleteOldRevisions(ttl) {
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// When deleting old revisions, we need to make sure that the oldest surviving revision
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// is a "merged" one (as opposed to a diff from a now deleted revision). So every time
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// we deleted a revision, we need to find if there's a corresponding surviving revision
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// and modify that revision into a "merged" one.
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const cutOffDate = Date.now() - ttl;
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const revisions = await this.modelSelectAll('SELECT * FROM revisions WHERE item_updated_time < ? ORDER BY item_updated_time DESC', [cutOffDate]);
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const doneItems = {};
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for (const rev of revisions) {
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const doneKey = `${rev.item_type}_${rev.item_id}`;
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if (doneItems[doneKey]) continue;
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const keptRev = await this.modelSelectOne('SELECT * FROM revisions WHERE item_updated_time >= ? AND item_type = ? AND item_id = ? ORDER BY item_updated_time ASC LIMIT 1', [cutOffDate, rev.item_type, rev.item_id]);
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try {
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const deleteQueryCondition = 'item_updated_time < ? AND item_id = ?';
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const deleteQueryParams = [cutOffDate, rev.item_id];
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const deleteQuery = { sql: `DELETE FROM revisions WHERE ${deleteQueryCondition}`, params: deleteQueryParams };
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if (!keptRev) {
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const hasEncrypted = await this.modelSelectOne(`SELECT * FROM revisions WHERE encryption_applied = 1 AND ${deleteQueryCondition}`, deleteQueryParams);
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if (hasEncrypted) throw new JoplinError('One of the revision to be deleted is encrypted', 'revision_encrypted');
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await this.db().transactionExecBatch([deleteQuery]);
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} else {
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// Note: we don't need to check for encrypted rev here because
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// mergeDiff will already throw the revision_encrypted exception
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// if a rev is encrypted.
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const merged = await this.mergeDiffs(keptRev);
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const queries = [deleteQuery, { sql: 'UPDATE revisions SET title_diff = ?, body_diff = ?, metadata_diff = ? WHERE id = ?', params: [this.createTextPatch('', merged.title), this.createTextPatch('', merged.body), this.createObjectPatch({}, merged.metadata), keptRev.id] }];
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await this.db().transactionExecBatch(queries);
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}
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} catch (error) {
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if (error.code === 'revision_encrypted') {
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this.logger().info(`Aborted deletion of old revisions for item ${rev.item_id} because one of the revisions is still encrypted`, error);
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} else {
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throw error;
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}
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}
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doneItems[doneKey] = true;
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}
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}
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static async revisionExists(itemType, itemId, updatedTime) {
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const existingRev = await Revision.latestRevision(itemType, itemId);
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return existingRev && existingRev.item_updated_time === updatedTime;
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}
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}
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module.exports = Revision;
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