250 行
8.9 KiB
JavaScript
250 行
8.9 KiB
JavaScript
'use strict';
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// Contains only auxiliary methods
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// May be included and executed unlimited number of times without any consequences
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// Polyfills for IE11
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Array.prototype.find = Array.prototype.find || function (condition) {
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return this.filter(condition)[0];
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};
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Array.from = Array.from || function (source) {
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return Array.prototype.slice.call(source);
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};
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NodeList.prototype.forEach = NodeList.prototype.forEach || function (callback) {
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Array.from(this).forEach(callback);
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};
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String.prototype.includes = String.prototype.includes || function (searchString) {
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return this.indexOf(searchString) >= 0;
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};
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String.prototype.startsWith = String.prototype.startsWith || function (prefix) {
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return this.substr(0, prefix.length) === prefix;
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};
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Math.sign = Math.sign || function(x) {
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x = +x;
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if (!x) return x; // 0 and NaN
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return x > 0 ? 1 : -1;
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};
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if (!window.hasOwnProperty('HTMLDetailsElement') && !window.hasOwnProperty('mockHTMLDetailsElement')) {
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window.mockHTMLDetailsElement = true;
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const style = 'details:not([open]) > :not(summary) {display: none}';
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document.head.appendChild(document.createElement('style')).textContent = style;
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addEventListener('click', function (e) {
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if (e.target.nodeName !== 'SUMMARY') return;
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const details = e.target.parentElement;
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if (details.hasAttribute('open'))
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details.removeAttribute('open');
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else
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details.setAttribute('open', '');
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});
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}
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// Monstrous global variable for handy code
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// Includes: clamp, xhr, storage.{get,set,remove}
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window.helpers = window.helpers || {
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/**
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* https://en.wikipedia.org/wiki/Clamping_(graphics)
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* @param {Number} num Source number
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* @param {Number} min Low border
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* @param {Number} max High border
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* @returns {Number} Clamped value
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*/
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clamp: function (num, min, max) {
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if (max < min) {
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var t = max; max = min; min = t; // swap max and min
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}
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if (max < num)
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return max;
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if (min > num)
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return min;
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return num;
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},
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/** @private */
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_xhr: function (method, url, options, callbacks) {
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const xhr = new XMLHttpRequest();
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xhr.open(method, url);
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// Default options
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xhr.responseType = 'json';
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xhr.timeout = 10000;
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// Default options redefining
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if (options.responseType)
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xhr.responseType = options.responseType;
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if (options.timeout)
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xhr.timeout = options.timeout;
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if (method === 'POST')
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xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
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// better than onreadystatechange because of 404 codes https://stackoverflow.com/a/36182963
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xhr.onloadend = function () {
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if (xhr.status === 200) {
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if (callbacks.on200) {
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// fix for IE11. It doesn't convert response to JSON
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if (xhr.responseType === '' && typeof(xhr.response) === 'string')
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callbacks.on200(JSON.parse(xhr.response));
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else
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callbacks.on200(xhr.response);
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}
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} else {
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// handled by onerror
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if (xhr.status === 0) return;
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if (callbacks.onNon200)
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callbacks.onNon200(xhr);
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}
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};
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xhr.ontimeout = function () {
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if (callbacks.onTimeout)
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callbacks.onTimeout(xhr);
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};
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xhr.onerror = function () {
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if (callbacks.onError)
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callbacks.onError(xhr);
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};
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if (options.payload)
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xhr.send(options.payload);
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else
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xhr.send();
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},
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/** @private */
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_xhrRetry: function(method, url, options, callbacks) {
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if (options.retries <= 0) {
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console.warn('Failed to pull', options.entity_name);
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if (callbacks.onTotalFail)
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callbacks.onTotalFail();
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return;
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}
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helpers._xhr(method, url, options, callbacks);
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},
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/**
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* @callback callbackXhrOn200
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* @param {Object} response - xhr.response
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*/
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/**
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* @callback callbackXhrError
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* @param {XMLHttpRequest} xhr
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*/
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/**
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* @param {'GET'|'POST'} method - 'GET' or 'POST'
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* @param {String} url - URL to send request to
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* @param {Object} options - other XHR options
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* @param {XMLHttpRequestBodyInit} [options.payload=null] - payload for POST-requests
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* @param {'arraybuffer'|'blob'|'document'|'json'|'text'} [options.responseType=json]
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* @param {Number} [options.timeout=10000]
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* @param {Number} [options.retries=1]
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* @param {String} [options.entity_name='unknown'] - string to log
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* @param {Number} [options.retry_timeout=1000]
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* @param {Object} callbacks - functions to execute on events fired
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* @param {callbackXhrOn200} [callbacks.on200]
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* @param {callbackXhrError} [callbacks.onNon200]
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* @param {callbackXhrError} [callbacks.onTimeout]
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* @param {callbackXhrError} [callbacks.onError]
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* @param {callbackXhrError} [callbacks.onTotalFail] - if failed after all retries
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*/
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xhr: function(method, url, options, callbacks) {
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if (!options.retries || options.retries <= 1) {
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helpers._xhr(method, url, options, callbacks);
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return;
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}
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if (!options.entity_name) options.entity_name = 'unknown';
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if (!options.retry_timeout) options.retry_timeout = 1000;
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const retries_total = options.retries;
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let currentTry = 1;
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const retry = function () {
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console.warn('Pulling ' + options.entity_name + ' failed... ' + (currentTry++) + '/' + retries_total);
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setTimeout(function () {
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options.retries--;
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helpers._xhrRetry(method, url, options, callbacks);
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}, options.retry_timeout);
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};
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// Pack retry() call into error handlers
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callbacks._onError = callbacks.onError;
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callbacks.onError = function (xhr) {
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if (callbacks._onError)
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callbacks._onError(xhr);
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retry();
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};
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callbacks._onTimeout = callbacks.onTimeout;
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callbacks.onTimeout = function (xhr) {
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if (callbacks._onTimeout)
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callbacks._onTimeout(xhr);
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retry();
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};
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helpers._xhrRetry(method, url, options, callbacks);
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},
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/**
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* @typedef {Object} invidiousStorage
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* @property {(key:String) => Object} get
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* @property {(key:String, value:Object)} set
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* @property {(key:String)} remove
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*/
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/**
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* Universal storage, stores and returns JS objects. Uses inside localStorage or cookies
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* @type {invidiousStorage}
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*/
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storage: (function () {
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// access to localStorage throws exception in Tor Browser, so try is needed
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let localStorageIsUsable = false;
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try{localStorageIsUsable = !!localStorage.setItem;}catch(e){}
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if (localStorageIsUsable) {
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return {
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get: function (key) {
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if (!localStorage[key]) return;
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try {
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return JSON.parse(decodeURIComponent(localStorage[key]));
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} catch(e) {
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// Erase non parsable value
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helpers.storage.remove(key);
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}
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},
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set: function (key, value) { localStorage[key] = encodeURIComponent(JSON.stringify(value)); },
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remove: function (key) { localStorage.removeItem(key); }
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};
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}
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// TODO: fire 'storage' event for cookies
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console.info('Storage: localStorage is disabled or unaccessible. Cookies used as fallback');
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return {
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get: function (key) {
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const cookiePrefix = key + '=';
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function findCallback(cookie) {return cookie.startsWith(cookiePrefix);}
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const matchedCookie = document.cookie.split('; ').find(findCallback);
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if (matchedCookie) {
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const cookieBody = matchedCookie.replace(cookiePrefix, '');
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if (cookieBody.length === 0) return;
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try {
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return JSON.parse(decodeURIComponent(cookieBody));
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} catch(e) {
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// Erase non parsable value
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helpers.storage.remove(key);
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}
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}
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},
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set: function (key, value) {
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const cookie_data = encodeURIComponent(JSON.stringify(value));
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// Set expiration in 2 year
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const date = new Date();
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date.setFullYear(date.getFullYear()+2);
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document.cookie = key + '=' + cookie_data + '; expires=' + date.toGMTString();
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},
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remove: function (key) {
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document.cookie = key + '=; Max-Age=0';
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}
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};
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})()
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};
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