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( function () { // Copied from mediawiki.requestIdleCallback const requestIdleCallbackInternal = function ( callback ) { setTimeout( () => { const start = ve.now(); callback( { didTimeout: false, timeRemaining: function () { // Hard code a target maximum busy time of 50 milliseconds return Math.max( 0, 50 - ( ve.now() - start ) ); } } ); }, 1 ); }; // eslint-disable-next-line compat/compat const requestIdleCallback = window.requestIdleCallback ? // Bind because it throws TypeError if context is not window // eslint-disable-next-line compat/compat window.requestIdleCallback.bind( window ) : requestIdleCallbackInternal; const EXPIRY_PREFIX = '_EXPIRY_'; /** * Implementation of ve.init.SafeStorage * * Duplicate of mediawiki.storage. * * @class ve.init.sa.SafeStorage * @extends ve.init.SafeStorage * * @constructor * @param {Storage|undefined} store The Storage instance to wrap around */ ve.init.sa.SafeStorage = function ( store ) { this.store = store; // Purge expired items once per page session setTimeout( () => { this.clearExpired(); }, 2000 ); }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.get = function ( key ) { if ( this.isExpired( key ) ) { return null; } try { return this.store.getItem( key ); } catch ( e ) {} return false; }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.set = function ( key, value, expiry ) { if ( key.slice( 0, EXPIRY_PREFIX.length ) === EXPIRY_PREFIX ) { throw new Error( 'Key can\'t have a prefix of ' + EXPIRY_PREFIX ); } try { this.store.setItem( key, value ); this.setExpires( key, expiry ); return true; } catch ( e ) {} return false; }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.remove = function ( key ) { try { this.store.removeItem( key ); this.setExpires( key ); return true; } catch ( e ) {} return false; }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.getObject = function ( key ) { const json = this.get( key ); if ( json === false ) { return false; } try { return JSON.parse( json ); } catch ( e ) {} return null; }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.setObject = function ( key, value, expiry ) { let json; try { json = JSON.stringify( value ); return this.set( key, json, expiry ); } catch ( e ) {} return false; }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.setExpires = function ( key, expiry ) { if ( expiry ) { try { this.store.setItem( EXPIRY_PREFIX + key, Math.floor( Date.now() / 1000 ) + expiry ); } catch ( e ) {} } else { try { this.store.removeItem( EXPIRY_PREFIX + key ); } catch ( e ) {} } }; // Minimum amount of time (in milliseconds) for an iteration involving localStorage access. const MIN_WORK_TIME = 3; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.clearExpired = function () { return this.getExpiryKeys().then( ( keys ) => $.Deferred( ( d ) => { const iterate = ( deadline ) => { while ( keys[ 0 ] !== undefined && deadline.timeRemaining() > MIN_WORK_TIME ) { const key = keys.shift(); if ( this.isExpired( key ) ) { this.remove( key ); } } if ( keys[ 0 ] !== undefined ) { // Ran out of time with keys still to remove, continue later requestIdleCallback( iterate ); } else { return d.resolve(); } }; requestIdleCallback( iterate ); } ) ); }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.getExpiryKeys = function () { const store = this.store; return $.Deferred( ( d ) => { requestIdleCallback( ( deadline ) => { const prefixLength = EXPIRY_PREFIX.length; const keys = []; let length = 0; try { length = store.length; } catch ( e ) {} // Optimization: If time runs out, degrade to checking fewer keys. // We will get another chance during a future page view. Iterate forward // so that older keys are checked first and increase likelihood of recovering // from key exhaustion. // // We don't expect to have more keys than we can handle in 50ms long-task window. // But, we might still run out of time when other tasks run before this, // or when the device receives UI events (especially on low-end devices). for ( let i = 0; ( i < length && deadline.timeRemaining() > MIN_WORK_TIME ); i++ ) { let key = null; try { key = store.key( i ); } catch ( e ) {} if ( key !== null && key.slice( 0, prefixLength ) === EXPIRY_PREFIX ) { keys.push( key.slice( prefixLength ) ); } } d.resolve( keys ); } ); } ).promise(); }; /** * @inheritdoc */ ve.init.sa.SafeStorage.prototype.isExpired = function ( key ) { let expiry; try { expiry = this.store.getItem( EXPIRY_PREFIX + key ); } catch ( e ) { return false; } return !!expiry && expiry < Math.floor( Date.now() / 1000 ); }; }() );
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