File size: 2,219 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 |
import debug from './debug';
/**
* Decodes a url-safe base64 encoded string.
* @param {string} str The url-safe base64 encoded string
* @returns {string} The decoded string
*/
function urlSafeBase64DecodeString( str ) {
const decodeMap = {
'-': '+',
_: '/',
'.': '=',
};
return window.atob( str.replace( /[-_.]/g, ( ch ) => decodeMap[ ch ] ) );
}
/**
* Decodes a URL param encoded by AMP's linker.js
* See also https://github.com/ampproject/amphtml/blob/HEAD/extensions/amp-analytics/linker-id-receiving.md
* @param {string} value Value to be decoded
* @returns {null | Object} null or and object containing key/value pairs
*/
function parseAmpEncodedParams( value ) {
value = value
.split( '*' )
.filter( ( val ) => val.length )
.slice( 2 );
// return null if empty or we have an odd number of elements
if ( 0 === value.length || 0 !== value.length % 2 ) {
return null;
}
const keyValMap = {};
for ( let i = 0; i < value.length; i += 2 ) {
keyValMap[ value[ i ] ] = urlSafeBase64DecodeString( value[ i + 1 ] );
}
return keyValMap;
}
/**
* Returns a URL instance with the original data plus the data extracted from `tk_amp`. Null if not a valid absolute URL.
* URL parameters explicitly present in the URL take precedence over the ones extracted from `tk_amp`.
* This function is used to support AMP-compatible tracking.
* @param {string} url URL to be parsed like `document.location.href`.
* @returns {Object} A URL instance with the original data plus the data extracted from `tk_amp`. Null if not a valid absolute URL.
*/
export default function urlParseAmpCompatible( url ) {
try {
const parsedUrl = new URL( url );
debug( 'urlParseAmpCompatible: original query:', parsedUrl.search );
if ( parsedUrl.searchParams.has( 'tk_amp' ) ) {
const tk_amp = parseAmpEncodedParams( parsedUrl.searchParams.get( 'tk_amp' ) );
debug( 'urlParseAmpCompatible: tk_amp:', tk_amp );
for ( const key of Object.keys( tk_amp ) ) {
if ( ! parsedUrl.searchParams.has( key ) ) {
parsedUrl.searchParams.set( key, tk_amp[ key ] );
}
}
}
debug( 'urlParseAmpCompatible: merged query:', parsedUrl.search );
return parsedUrl;
} catch {
return null;
}
}
|