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See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Fetch and render dates from timestamps.\n *\n * @module core/user_date\n * @package core\n * @copyright 2017 Ryan Wyllie <ryan@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery', 'core/ajax', 'core/sessionstorage', 'core/config'],\n function($, Ajax, Storage, Config) {\n\n var SECONDS_IN_DAY = 86400;\n\n /** @var {object} promisesCache Store all promises we've seen so far. */\n var promisesCache = {};\n\n /**\n * Generate a cache key for the given request. The request should\n * have a timestamp and format key.\n *\n * @param {object} request\n * @return {string}\n */\n var getKey = function(request) {\n var language = $('html').attr('lang').replace(/-/g, '_');\n return 'core_user_date/' +\n language + '/' +\n Config.usertimezone + '/' +\n request.timestamp + '/' +\n request.format;\n };\n\n /**\n * Retrieve a transformed date from the browser's storage.\n *\n * @param {string} key\n * @return {string}\n */\n var getFromLocalStorage = function(key) {\n return Storage.get(key);\n };\n\n /**\n * Save the transformed date in the browser's storage.\n *\n * @param {string} key\n * @param {string} value\n */\n var addToLocalStorage = function(key, value) {\n Storage.set(key, value);\n };\n\n /**\n * Check if a key is in the module's cache.\n *\n * @param {string} key\n * @return {bool}\n */\n var inPromisesCache = function(key) {\n return (typeof promisesCache[key] !== 'undefined');\n };\n\n /**\n * Retrieve a promise from the module's cache.\n *\n * @param {string} key\n * @return {object} jQuery promise\n */\n var getFromPromisesCache = function(key) {\n return promisesCache[key];\n };\n\n /**\n * Save the given promise in the module's cache.\n *\n * @param {string} key\n * @param {object} promise\n */\n var addToPromisesCache = function(key, promise) {\n promisesCache[key] = promise;\n };\n\n /**\n * Send a request to the server for each of the required timestamp\n * and format combinations.\n *\n * Resolves the date's deferred with the values returned from the\n * server and saves the value in local storage.\n *\n * @param {array} dates\n * @return {object} jQuery promise\n */\n var loadDatesFromServer = function(dates) {\n var args = dates.map(function(data) {\n var fixDay = data.hasOwnProperty('fixday') ? data.fixday : 1;\n var fixHour = data.hasOwnProperty('fixhour') ? data.fixhour : 1;\n return {\n timestamp: data.timestamp,\n format: data.format,\n type: data.type || '',\n fixday: fixDay,\n fixhour: fixHour\n };\n });\n\n var request = {\n methodname: 'core_get_user_dates',\n args: {\n contextid: Config.contextid,\n timestamps: args\n }\n };\n\n return Ajax.call([request], true, true)[0].then(function(results) {\n results.dates.forEach(function(value, index) {\n var date = dates[index];\n var key = getKey(date);\n\n addToLocalStorage(key, value);\n date.deferred.resolve(value);\n });\n return;\n })\n .catch(function(ex) {\n // If we failed to retrieve the dates then reject the date's\n // deferred objects to make sure they don't hang.\n dates.forEach(function(date) {\n date.deferred.reject(ex);\n });\n });\n };\n\n /**\n * Takes an array of request objects and returns a promise that\n * is resolved with an array of formatted dates.\n *\n * The values in the returned array will be ordered the same as\n * the request array.\n *\n * This function will check both the module's static promises cache\n * and the browser's session storage to see if the user dates have\n * already been loaded in order to avoid sending a network request\n * if possible.\n *\n * Only dates not found in either cache will be sent to the server\n * for transforming.\n *\n * A request object must have a timestamp key and a format key and\n * optionally may have a type key.\n *\n * E.g.\n * var request = [\n * {\n * timestamp: 1293876000,\n * format: '%d %B %Y'\n * },\n * {\n * timestamp: 1293876000,\n * format: '%A, %d %B %Y, %I:%M %p',\n * type: 'gregorian',\n * fixday: false,\n * fixhour: false\n * }\n * ];\n *\n * UserDate.get(request).done(function(dates) {\n * console.log(dates[0]); // prints \"1 January 2011\".\n * console.log(dates[1]); // prints \"Saturday, 1 January 2011, 10:00 AM\".\n * });\n *\n * @param {array} requests\n * @return {object} jQuery promise\n */\n var get = function(requests) {\n var ajaxRequests = [];\n var promises = [];\n\n // Loop over each of the requested timestamp/format combos\n // and add a promise to the promises array for them.\n requests.forEach(function(request) {\n var key = getKey(request);\n\n // If we've already got a promise then use it.\n if (inPromisesCache(key)) {\n promises.push(getFromPromisesCache(key));\n } else {\n var deferred = $.Deferred();\n var cached = getFromLocalStorage(key);\n\n if (cached) {\n // If we were able to get the value from session storage\n // then we can resolve the deferred with that value. No\n // need to ask the server to transform it for us.\n deferred.resolve(cached);\n } else {\n // Add this request to the list of ones we need to load\n // from the server. Include the deferred so that it can\n // be resolved when the server has responded with the\n // transformed values.\n request.deferred = deferred;\n ajaxRequests.push(request);\n }\n\n // Remember this promise for next time so that we can\n // bail out early if it is requested again.\n addToPromisesCache(key, deferred.promise());\n promises.push(deferred.promise());\n }\n });\n\n // If we have any requests that we couldn't resolve from the caches\n // then let's ask the server to get them for us.\n if (ajaxRequests.length) {\n loadDatesFromServer(ajaxRequests);\n }\n\n // Wait for all of the promises to resolve. Some of them may be waiting\n // for a response from the server.\n return $.when.apply($, promises).then(function() {\n // This looks complicated but it's just converting an unknown\n // length of arguments into an array for the promise to resolve\n // with.\n return arguments.length === 1 ? [arguments[0]] : Array.apply(null, arguments);\n });\n };\n\n\n /**\n * For a given timestamp get the midnight value in the user's timezone.\n *\n * The calculation is performed relative to the user's midnight timestamp\n * for today to ensure that timezones are preserved.\n *\n * E.g.\n * Input:\n * timestamp: 1514836800 (01/01/2018 8pm GMT)(02/01/2018 4am GMT+8)\n * midnight: 1514851200 (02/01/2018 midnight GMT)\n * Output:\n * 1514764800 (01/01/2018 midnight GMT)\n *\n * Input:\n * timestamp: 1514836800 (01/01/2018 8pm GMT)(02/01/2018 4am GMT+8)\n * midnight: 1514822400 (02/01/2018 midnight GMT+8)\n * Output:\n * 1514822400 (02/01/2018 midnight GMT+8)\n *\n * @param {Number} timestamp The timestamp to calculate from\n * @param {Number} todayMidnight The user's midnight timestamp\n * @return {Number} The midnight value of the user's timestamp\n */\n var getUserMidnightForTimestamp = function(timestamp, todayMidnight) {\n var future = timestamp > todayMidnight;\n var diffSeconds = Math.abs(timestamp - todayMidnight);\n var diffDays = future ? Math.floor(diffSeconds / SECONDS_IN_DAY) : Math.ceil(diffSeconds / SECONDS_IN_DAY);\n var diffDaysInSeconds = diffDays * SECONDS_IN_DAY;\n // Is the timestamp in the future or past?\n var dayTimestamp = future ? todayMidnight + diffDaysInSeconds : todayMidnight - diffDaysInSeconds;\n return dayTimestamp;\n };\n\n return {\n get: get,\n getUserMidnightForTimestamp: getUserMidnightForTimestamp\n };\n});\n"],"file":"user_date.min.js"}