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| 1 | +/** |
| 2 | + * For jQuery versions less than 3.4.0, this replaces the jQuery.extend |
| 3 | + * function with the one from jQuery 3.4.0, slightly modified (documented |
| 4 | + * below) to be compatible with older jQuery versions and browsers. |
| 5 | + * |
| 6 | + * This provides the Object.prototype pollution vulnerability fix to Drupal |
| 7 | + * installations running older jQuery versions, including the versions shipped |
| 8 | + * with Drupal core and https://www.drupal.org/project/jquery_update. |
| 9 | + * |
| 10 | + * @see https://github.com/jquery/jquery/pull/4333 |
| 11 | + */ |
| 12 | + |
| 13 | +(function (jQuery) { |
| 14 | + |
| 15 | +// Do not override jQuery.extend() if the jQuery version is already >=3.4.0. |
| 16 | +var versionParts = jQuery.fn.jquery.split('.'); |
| 17 | +var majorVersion = parseInt(versionParts[0]); |
| 18 | +var minorVersion = parseInt(versionParts[1]); |
| 19 | +var patchVersion = parseInt(versionParts[2]); |
| 20 | +var isPreReleaseVersion = (patchVersion.toString() !== versionParts[2]); |
| 21 | +if ( |
| 22 | + (majorVersion > 3) || |
| 23 | + (majorVersion === 3 && minorVersion > 4) || |
| 24 | + (majorVersion === 3 && minorVersion === 4 && patchVersion > 0) || |
| 25 | + (majorVersion === 3 && minorVersion === 4 && patchVersion === 0 && !isPreReleaseVersion) |
| 26 | +) { |
| 27 | + return; |
| 28 | +} |
| 29 | + |
| 30 | +/** |
| 31 | + * This is almost verbatim copied from jQuery 3.4.0. |
| 32 | + * |
| 33 | + * Only two minor changes have been made: |
| 34 | + * - The call to isFunction() is changed to jQuery.isFunction(). |
| 35 | + * - The two calls to Array.isArray() is changed to jQuery.isArray(). |
| 36 | + * |
| 37 | + * The above two changes ensure compatibility with all older jQuery versions |
| 38 | + * (1.4.4 - 3.3.1) and older browser versions (e.g., IE8). |
| 39 | + */ |
| 40 | +jQuery.extend = jQuery.fn.extend = function() { |
| 41 | + var options, name, src, copy, copyIsArray, clone, |
| 42 | + target = arguments[ 0 ] || {}, |
| 43 | + i = 1, |
| 44 | + length = arguments.length, |
| 45 | + deep = false; |
| 46 | + |
| 47 | + // Handle a deep copy situation |
| 48 | + if ( typeof target === "boolean" ) { |
| 49 | + deep = target; |
| 50 | + |
| 51 | + // Skip the boolean and the target |
| 52 | + target = arguments[ i ] || {}; |
| 53 | + i++; |
| 54 | + } |
| 55 | + |
| 56 | + // Handle case when target is a string or something (possible in deep copy) |
| 57 | + if ( typeof target !== "object" && !jQuery.isFunction( target ) ) { |
| 58 | + target = {}; |
| 59 | + } |
| 60 | + |
| 61 | + // Extend jQuery itself if only one argument is passed |
| 62 | + if ( i === length ) { |
| 63 | + target = this; |
| 64 | + i--; |
| 65 | + } |
| 66 | + |
| 67 | + for ( ; i < length; i++ ) { |
| 68 | + |
| 69 | + // Only deal with non-null/undefined values |
| 70 | + if ( ( options = arguments[ i ] ) != null ) { |
| 71 | + |
| 72 | + // Extend the base object |
| 73 | + for ( name in options ) { |
| 74 | + copy = options[ name ]; |
| 75 | + |
| 76 | + // Prevent Object.prototype pollution |
| 77 | + // Prevent never-ending loop |
| 78 | + if ( name === "__proto__" || target === copy ) { |
| 79 | + continue; |
| 80 | + } |
| 81 | + |
| 82 | + // Recurse if we're merging plain objects or arrays |
| 83 | + if ( deep && copy && ( jQuery.isPlainObject( copy ) || |
| 84 | + ( copyIsArray = jQuery.isArray( copy ) ) ) ) { |
| 85 | + src = target[ name ]; |
| 86 | + |
| 87 | + // Ensure proper type for the source value |
| 88 | + if ( copyIsArray && !jQuery.isArray( src ) ) { |
| 89 | + clone = []; |
| 90 | + } else if ( !copyIsArray && !jQuery.isPlainObject( src ) ) { |
| 91 | + clone = {}; |
| 92 | + } else { |
| 93 | + clone = src; |
| 94 | + } |
| 95 | + copyIsArray = false; |
| 96 | + |
| 97 | + // Never move original objects, clone them |
| 98 | + target[ name ] = jQuery.extend( deep, clone, copy ); |
| 99 | + |
| 100 | + // Don't bring in undefined values |
| 101 | + } else if ( copy !== undefined ) { |
| 102 | + target[ name ] = copy; |
| 103 | + } |
| 104 | + } |
| 105 | + } |
| 106 | + } |
| 107 | + |
| 108 | + // Return the modified object |
| 109 | + return target; |
| 110 | +}; |
| 111 | + |
| 112 | +})(jQuery); |
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