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361 lines
12 KiB
HTML
361 lines
12 KiB
HTML
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<title>JSDoc: Source: becca/entities/abstract_becca_entity.js</title>
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<h1 class="page-title">Source: becca/entities/abstract_becca_entity.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>"use strict";
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const utils = require('../../services/utils');
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const sql = require('../../services/sql');
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const entityChangesService = require('../../services/entity_changes');
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const eventService = require("../../services/events");
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const dateUtils = require("../../services/date_utils");
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const cls = require("../../services/cls");
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const log = require("../../services/log");
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const protectedSessionService = require("../../services/protected_session");
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const blobService = require("../../services/blob");
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let becca = null;
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/**
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* Base class for all backend entities.
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*/
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class AbstractBeccaEntity {
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/** @protected */
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beforeSaving() {
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if (!this[this.constructor.primaryKeyName]) {
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this[this.constructor.primaryKeyName] = utils.newEntityId();
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}
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}
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/** @protected */
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getUtcDateChanged() {
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return this.utcDateModified || this.utcDateCreated;
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}
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/**
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* @protected
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* @returns {Becca}
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*/
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get becca() {
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if (!becca) {
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becca = require('../becca');
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}
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return becca;
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}
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/** @protected */
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putEntityChange(isDeleted) {
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entityChangesService.putEntityChange({
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entityName: this.constructor.entityName,
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entityId: this[this.constructor.primaryKeyName],
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hash: this.generateHash(isDeleted),
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isErased: false,
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utcDateChanged: this.getUtcDateChanged(),
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isSynced: this.constructor.entityName !== 'options' || !!this.isSynced
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});
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}
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/**
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* @protected
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* @returns {string}
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*/
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generateHash(isDeleted) {
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let contentToHash = "";
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for (const propertyName of this.constructor.hashedProperties) {
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contentToHash += `|${this[propertyName]}`;
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}
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if (isDeleted) {
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contentToHash += "|deleted";
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}
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return utils.hash(contentToHash).substr(0, 10);
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}
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/** @protected */
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getPojoToSave() {
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return this.getPojo();
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}
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/**
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* @protected
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* @abstract
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*/
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getPojo() {
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throw new Error(`Unimplemented getPojo() for entity '${this.constructor.name}'`)
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}
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/**
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* Saves entity - executes SQL, but doesn't commit the transaction on its own
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*
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* @returns {this}
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*/
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save(opts = {}) {
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const entityName = this.constructor.entityName;
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const primaryKeyName = this.constructor.primaryKeyName;
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const isNewEntity = !this[primaryKeyName];
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this.beforeSaving(opts);
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const pojo = this.getPojoToSave();
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sql.transactional(() => {
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sql.upsert(entityName, primaryKeyName, pojo);
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if (entityName === 'recent_notes') {
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return;
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}
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this.putEntityChange(!!this.isDeleted);
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if (!cls.isEntityEventsDisabled()) {
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const eventPayload = {
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entityName,
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entity: this
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};
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if (isNewEntity) {
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eventService.emit(eventService.ENTITY_CREATED, eventPayload);
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}
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eventService.emit(eventService.ENTITY_CHANGED, eventPayload);
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}
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});
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return this;
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}
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/** @protected */
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_setContent(content, opts = {}) {
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// client code asks to save entity even if blobId didn't change (something else was changed)
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opts.forceSave = !!opts.forceSave;
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opts.forceFrontendReload = !!opts.forceFrontendReload;
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if (content === null || content === undefined) {
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throw new Error(`Cannot set null content to ${this.constructor.primaryKeyName} '${this[this.constructor.primaryKeyName]}'`);
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}
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if (this.hasStringContent()) {
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content = content.toString();
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} else {
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content = Buffer.isBuffer(content) ? content : Buffer.from(content);
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}
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const unencryptedContentForHashCalculation = this.#getUnencryptedContentForHashCalculation(content);
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if (this.isProtected) {
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if (protectedSessionService.isProtectedSessionAvailable()) {
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content = protectedSessionService.encrypt(content);
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} else {
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throw new Error(`Cannot update content of blob since protected session is not available.`);
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}
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}
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sql.transactional(() => {
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const newBlobId = this.#saveBlob(content, unencryptedContentForHashCalculation, opts);
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const oldBlobId = this.blobId;
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if (newBlobId !== oldBlobId || opts.forceSave) {
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this.blobId = newBlobId;
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this.save();
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if (newBlobId !== oldBlobId) {
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this.#deleteBlobIfNotUsed(oldBlobId);
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}
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}
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});
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}
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#deleteBlobIfNotUsed(oldBlobId) {
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if (sql.getValue("SELECT 1 FROM notes WHERE blobId = ? LIMIT 1", [oldBlobId])) {
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return;
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}
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if (sql.getValue("SELECT 1 FROM attachments WHERE blobId = ? LIMIT 1", [oldBlobId])) {
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return;
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}
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if (sql.getValue("SELECT 1 FROM revisions WHERE blobId = ? LIMIT 1", [oldBlobId])) {
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return;
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}
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sql.execute("DELETE FROM blobs WHERE blobId = ?", [oldBlobId]);
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// blobs are not marked as erased in entity_changes, they are just purged completely
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// this is because technically every keystroke can create a new blob, and there would be just too many
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sql.execute("DELETE FROM entity_changes WHERE entityName = 'blobs' AND entityId = ?", [oldBlobId]);
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}
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#getUnencryptedContentForHashCalculation(unencryptedContent) {
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if (this.isProtected) {
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// a "random" prefix makes sure that the calculated hash/blobId is different for a decrypted/encrypted content
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const encryptedPrefixSuffix = "t$[nvQg7q)&_ENCRYPTED_?M:Bf&j3jr_";
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return Buffer.isBuffer(unencryptedContent)
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? Buffer.concat([Buffer.from(encryptedPrefixSuffix), unencryptedContent])
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: `${encryptedPrefixSuffix}${unencryptedContent}`;
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} else {
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return unencryptedContent;
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}
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}
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#saveBlob(content, unencryptedContentForHashCalculation, opts = {}) {
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/*
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* We're using the unencrypted blob for the hash calculation, because otherwise the random IV would
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* cause every content blob to be unique which would balloon the database size (esp. with revisioning).
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* This has minor security implications (it's easy to infer that given content is shared between different
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* notes/attachments), but the trade-off comes out clearly positive.
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*/
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const newBlobId = utils.hashedBlobId(unencryptedContentForHashCalculation);
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const blobNeedsInsert = !sql.getValue('SELECT 1 FROM blobs WHERE blobId = ?', [newBlobId]);
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if (!blobNeedsInsert) {
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return newBlobId;
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}
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const pojo = {
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blobId: newBlobId,
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content: content,
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dateModified: dateUtils.localNowDateTime(),
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utcDateModified: dateUtils.utcNowDateTime()
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};
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sql.upsert("blobs", "blobId", pojo);
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// we can't reuse blobId as an entity_changes hash, because this one has to be calculatable without having
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// access to the decrypted content
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const hash = blobService.calculateContentHash(pojo);
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entityChangesService.putEntityChange({
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entityName: 'blobs',
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entityId: newBlobId,
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hash: hash,
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isErased: false,
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utcDateChanged: pojo.utcDateModified,
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isSynced: true,
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// overriding componentId will cause the frontend to think the change is coming from a different component
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// and thus reload
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componentId: opts.forceFrontendReload ? utils.randomString(10) : null
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});
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eventService.emit(eventService.ENTITY_CHANGED, {
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entityName: 'blobs',
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entity: this
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});
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return newBlobId;
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}
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/**
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* @protected
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* @returns {string|Buffer}
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*/
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_getContent() {
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const row = sql.getRow(`SELECT content FROM blobs WHERE blobId = ?`, [this.blobId]);
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if (!row) {
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throw new Error(`Cannot find content for ${this.constructor.primaryKeyName} '${this[this.constructor.primaryKeyName]}', blobId '${this.blobId}'`);
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}
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return blobService.processContent(row.content, this.isProtected, this.hasStringContent());
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}
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/**
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* Mark the entity as (soft) deleted. It will be completely erased later.
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*
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* This is a low-level method, for notes and branches use `note.deleteNote()` and 'branch.deleteBranch()` instead.
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*
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* @param [deleteId=null]
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*/
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markAsDeleted(deleteId = null) {
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const entityId = this[this.constructor.primaryKeyName];
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const entityName = this.constructor.entityName;
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this.utcDateModified = dateUtils.utcNowDateTime();
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sql.execute(`UPDATE ${entityName} SET isDeleted = 1, deleteId = ?, utcDateModified = ?
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WHERE ${this.constructor.primaryKeyName} = ?`,
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[deleteId, this.utcDateModified, entityId]);
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if (this.dateModified) {
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this.dateModified = dateUtils.localNowDateTime();
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sql.execute(`UPDATE ${entityName} SET dateModified = ? WHERE ${this.constructor.primaryKeyName} = ?`,
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[this.dateModified, entityId]);
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}
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log.info(`Marking ${entityName} ${entityId} as deleted`);
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this.putEntityChange(true);
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eventService.emit(eventService.ENTITY_DELETED, { entityName, entityId, entity: this });
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}
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markAsDeletedSimple() {
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const entityId = this[this.constructor.primaryKeyName];
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const entityName = this.constructor.entityName;
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this.utcDateModified = dateUtils.utcNowDateTime();
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sql.execute(`UPDATE ${entityName} SET isDeleted = 1, utcDateModified = ?
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WHERE ${this.constructor.primaryKeyName} = ?`,
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[this.utcDateModified, entityId]);
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log.info(`Marking ${entityName} ${entityId} as deleted`);
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this.putEntityChange(true);
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eventService.emit(eventService.ENTITY_DELETED, { entityName, entityId, entity: this });
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}
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}
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module.exports = AbstractBeccaEntity;
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</code></pre>
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</article>
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</section>
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</div>
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<nav>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sql.html">sql</a></li></ul><h3>Classes</h3><ul><li><a href="AbstractBeccaEntity.html">AbstractBeccaEntity</a></li><li><a href="BAttachment.html">BAttachment</a></li><li><a href="BAttribute.html">BAttribute</a></li><li><a href="BBranch.html">BBranch</a></li><li><a href="BEtapiToken.html">BEtapiToken</a></li><li><a href="BNote.html">BNote</a></li><li><a href="BOption.html">BOption</a></li><li><a href="BRecentNote.html">BRecentNote</a></li><li><a href="BRevision.html">BRevision</a></li><li><a href="BackendScriptApi.html">BackendScriptApi</a></li></ul><h3>Global</h3><ul><li><a href="global.html#api">api</a></li></ul>
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