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			243 lines
		
	
	
		
			7.9 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
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								    <title>JSDoc: Source: becca/entities/bnote_revision.js</title>
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								<div id="main">
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								    <h1 class="page-title">Source: becca/entities/bnote_revision.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 protectedSessionService = require('../../services/protected_session');
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								const utils = require('../../services/utils');
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								const sql = require('../../services/sql');
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								const dateUtils = require('../../services/date_utils');
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								const becca = require('../becca');
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								const entityChangesService = require('../../services/entity_changes');
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								const AbstractBeccaEntity = require("./abstract_becca_entity");
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								/**
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								 * NoteRevision represents snapshot of note's title and content at some point in the past.
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								 * It's used for seamless note versioning.
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								 *
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								 * @extends AbstractBeccaEntity
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								 */
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								class BNoteRevision extends AbstractBeccaEntity {
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								    static get entityName() { return "note_revisions"; }
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								    static get primaryKeyName() { return "noteRevisionId"; }
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								    static get hashedProperties() { return ["noteRevisionId", "noteId", "title", "isProtected", "dateLastEdited", "dateCreated", "utcDateLastEdited", "utcDateCreated", "utcDateModified"]; }
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								    constructor(row, titleDecrypted = false) {
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								        super();
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								        /** @type {string} */
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								        this.noteRevisionId = row.noteRevisionId;
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								        /** @type {string} */
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								        this.noteId = row.noteId;
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								        /** @type {string} */
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								        this.type = row.type;
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								        /** @type {string} */
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								        this.mime = row.mime;
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								        /** @type {boolean} */
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								        this.isProtected = !!row.isProtected;
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								        /** @type {string} */
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								        this.title = row.title;
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								        /** @type {string} */
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								        this.dateLastEdited = row.dateLastEdited;
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								        /** @type {string} */
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								        this.dateCreated = row.dateCreated;
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								        /** @type {string} */
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								        this.utcDateLastEdited = row.utcDateLastEdited;
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								        /** @type {string} */
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								        this.utcDateCreated = row.utcDateCreated;
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								        /** @type {string} */
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								        this.utcDateModified = row.utcDateModified;
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								        /** @type {number} */
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								        this.contentLength = row.contentLength;
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								        if (this.isProtected && !titleDecrypted) {
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								            this.title = protectedSessionService.isProtectedSessionAvailable()
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								                ? protectedSessionService.decryptString(this.title)
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								                : "[protected]";
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								        }
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								    }
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								    getNote() {
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								        return becca.notes[this.noteId];
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								    }
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								    /** @returns {boolean} true if the note has string content (not binary) */
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								    isStringNote() {
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								        return utils.isStringNote(this.type, this.mime);
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								    }
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								    /*
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								     * Note revision content has quite special handling - it's not a separate entity, but a lazily loaded
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								     * part of NoteRevision entity with its own sync. Reason behind this hybrid design is that
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								     * content can be quite large, and it's not necessary to load it / fill memory for any note access even
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								     * if we don't need a content, especially for bulk operations like search.
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								     *
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								     * This is the same approach as is used for Note's content.
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								     */
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								    /** @returns {*} */
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								    getContent(silentNotFoundError = false) {
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								        const res = sql.getRow(`SELECT content FROM note_revision_contents WHERE noteRevisionId = ?`, [this.noteRevisionId]);
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								        if (!res) {
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								            if (silentNotFoundError) {
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								                return undefined;
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								            }
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								            else {
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								                throw new Error(`Cannot find note revision content for noteRevisionId=${this.noteRevisionId}`);
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								            }
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								        }
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								        let content = res.content;
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								        if (this.isProtected) {
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								            if (protectedSessionService.isProtectedSessionAvailable()) {
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								                content = protectedSessionService.decrypt(content);
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								            }
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								            else {
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								                content = "";
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								            }
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								        }
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								        if (this.isStringNote()) {
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								            return content === null
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								                ? ""
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								                : content.toString("UTF-8");
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								        }
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								        else {
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								            return content;
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								        }
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								    }
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								    setContent(content) {
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								        const pojo = {
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								            noteRevisionId: this.noteRevisionId,
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								            content: content,
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								            utcDateModified: dateUtils.utcNowDateTime()
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								        };
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								        if (this.isProtected) {
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								            if (protectedSessionService.isProtectedSessionAvailable()) {
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								                pojo.content = protectedSessionService.encrypt(pojo.content);
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								            }
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								            else {
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								                throw new Error(`Cannot update content of noteRevisionId=${this.noteRevisionId} since we're out of protected session.`);
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								            }
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								        }
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								        sql.upsert("note_revision_contents", "noteRevisionId", pojo);
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								        const hash = utils.hash(`${this.noteRevisionId}|${pojo.content.toString()}`);
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								        entityChangesService.addEntityChange({
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								            entityName: 'note_revision_contents',
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								            entityId: this.noteRevisionId,
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								            hash: hash,
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								            isErased: false,
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								            utcDateChanged: this.getUtcDateChanged(),
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								            isSynced: true
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								        });
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								    }
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								    /** @returns {{contentLength, dateModified, utcDateModified}} */
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								    getContentMetadata() {
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								        return sql.getRow(`
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								            SELECT 
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								                LENGTH(content) AS contentLength, 
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								                dateModified,
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								                utcDateModified 
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								            FROM note_revision_contents 
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								            WHERE noteRevisionId = ?`, [this.noteRevisionId]);
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								    }
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								    beforeSaving() {
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								        super.beforeSaving();
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								        this.utcDateModified = dateUtils.utcNowDateTime();
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								    }
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								    getPojo() {
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								        return {
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								            noteRevisionId: this.noteRevisionId,
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								            noteId: this.noteId,
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								            type: this.type,
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								            mime: this.mime,
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								            isProtected: this.isProtected,
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								            title: this.title,
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								            dateLastEdited: this.dateLastEdited,
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								            dateCreated: this.dateCreated,
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								            utcDateLastEdited: this.utcDateLastEdited,
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								            utcDateCreated: this.utcDateCreated,
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								            utcDateModified: this.utcDateModified,
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								            contentLength: this.contentLength
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								        };
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								    }
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								    getPojoToSave() {
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								        const pojo = this.getPojo();
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								        delete pojo.contentLength; // not getting persisted
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								        if (pojo.isProtected) {
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								            if (protectedSessionService.isProtectedSessionAvailable()) {
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								                pojo.title = protectedSessionService.encrypt(this.title);
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								            }
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								            else {
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								                // updating protected note outside of protected session means we will keep original ciphertexts
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								                delete pojo.title;
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								            }
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								        }
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								        return pojo;
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								    }
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								}
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								module.exports = BNoteRevision;
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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="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="BNoteRevision.html">BNoteRevision</a></li><li><a href="BOption.html">BOption</a></li><li><a href="BRecentNote.html">BRecentNote</a></li><li><a href="BackendScriptApi.html">BackendScriptApi</a></li></ul>
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								</nav>
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								<br class="clear">
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								<footer>
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								    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.1</a>
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								</footer>
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								<script> prettyPrint(); </script>
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								<script src="scripts/linenumber.js"> </script>
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								</body>
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								</html>
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