82 lines
2.6 KiB
JavaScript
82 lines
2.6 KiB
JavaScript
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/*jslint es6: true*/
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/*global window*/
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(function () {
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"use strict";
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const {packingLib, standards, constants} = window.WEB_API_MANAGER;
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const standardsNames = Object.keys(standards);
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const shouldLogKey = constants.shouldLogKey;
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const allStandardsWithShouldLogOption = standardsNames.concat([shouldLogKey]);
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/**
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* Creates a cookie safe encoding of standards to block, and
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* whether logging should be enabled.
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*
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* This function is the inverse of the `fromCookieValue` function
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* in this module.
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*
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* The `standardsToBlock` array must be a subset of all the standards
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* documented in data/standards.
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*
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* @param array standardsToBlock
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* An array of strings, each a standard that should be blocked.
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* @param bool shouldLog
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* Whether logging should be enabled.
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*
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* @return string
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* A cookie safe string encoding the above values.
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*/
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const toCookieValue = function (standardsToBlock, shouldLog) {
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const standardsToBlockWithshouldLogKey = shouldLog
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? standardsToBlock.concat(shouldLogKey)
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: standardsToBlock;
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const packedValues = packingLib.pack(
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allStandardsWithShouldLogOption,
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standardsToBlockWithshouldLogKey
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);
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// Last, replace "=" with "-" in the base64 string, to avoid
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// silly ambiguities in the cookie value.
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return packedValues.replace(/\=/g, "-");
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};
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/**
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* Takes a encoded string (created from the `toCookieValue` function
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* in this module) and returns to values, one an array of
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* standard names, and two, a boolean flag of whether the logging option
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* is enabled.
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*
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* @param string data
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* A string created from `toCookieValue`
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*
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* @return [array, bool]
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* An array of strings of standard names (representing standards to
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* block), and a boolean describing whether to log blocking
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* behavior.
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*/
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const fromCookieValue = function (data) {
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const base64Data = data.replace(/-/g, "=");
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const unpackedValues = packingLib.unpack(allStandardsWithShouldLogOption, base64Data);
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let shouldLog;
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const standardsToBlock = unpackedValues;
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const indexOfShouldLog = unpackedValues.indexOf(shouldLogKey);
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if (indexOfShouldLog === -1) {
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shouldLog = false;
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} else {
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shouldLog = true;
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standardsToBlock.splice(indexOfShouldLog, 1);
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}
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return [standardsToBlock, shouldLog];
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};
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window.WEB_API_MANAGER.cookieEncodingLib = {
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toCookieValue,
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fromCookieValue
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};
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}());
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