mirror of https://github.com/gorhill/uBlock.git
Add `trusted-set-constant` scriptlet
Alias: `trusted-set`
Behaves exactly like set-constant, except that any arbitrary JSON-
compatible value can be set.
By default the value is treated as a string, which can be anything.
If the value starts with `{` and ends with `}`, the value will be
JSON-parsed, and the `value` property of the resulting object will
be used.
As with any scriptlet requiring trust, filters using
`trusted-set-constant` can only come from trusted filter lists,
otherwise they are discarded.
Related discussion:
- https://github.com/uBlockOrigin/uAssets/discussions/18185#discussioncomment-5977456
This commit is contained in:
Raymond Hill
parent
d74c73e452
commit
19cdd50a1c
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@ -157,6 +157,208 @@ function runAt(fn, when) {
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safe.addEventListener.apply(document, args);
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}
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'set-constant-core.fn',
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fn: setConstantCore,
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dependencies: [
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'safe-self.fn',
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],
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});
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function setConstantCore(
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trusted = false,
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arg1 = '',
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arg2 = '',
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arg3 = ''
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) {
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const details = typeof arg1 !== 'object'
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? { prop: arg1, value: arg2 }
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: arg1;
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if ( arg3 !== '' ) {
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if ( /^\d$/.test(arg3) ) {
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details.options = [ arg3 ];
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} else {
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details.options = Array.from(arguments).slice(3);
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}
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}
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const { prop: chain = '', value: cValue = '' } = details;
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if ( typeof chain !== 'string' ) { return; }
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if ( chain === '' ) { return; }
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const options = details.options || [];
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function setConstant(chain, cValue) {
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const trappedProp = (( ) => {
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const pos = chain.lastIndexOf('.');
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if ( pos === -1 ) { return chain; }
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return chain.slice(pos+1);
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})();
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if ( trappedProp === '' ) { return; }
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const thisScript = document.currentScript;
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const objectDefineProperty = Object.defineProperty.bind(Object);
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const cloakFunc = fn => {
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objectDefineProperty(fn, 'name', { value: trappedProp });
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const proxy = new Proxy(fn, {
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defineProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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deleteProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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get(target, prop) {
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if ( prop === 'toString' ) {
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return function() {
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return `function ${trappedProp}() { [native code] }`;
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}.bind(null);
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}
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return Reflect.get(...arguments);
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},
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});
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return proxy;
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};
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if ( cValue === 'undefined' ) {
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cValue = undefined;
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} else if ( cValue === 'false' ) {
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cValue = false;
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} else if ( cValue === 'true' ) {
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cValue = true;
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} else if ( cValue === 'null' ) {
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cValue = null;
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} else if ( cValue === "''" ) {
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cValue = '';
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} else if ( cValue === '[]' ) {
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cValue = [];
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} else if ( cValue === '{}' ) {
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cValue = {};
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} else if ( cValue === 'noopFunc' ) {
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cValue = cloakFunc(function(){});
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} else if ( cValue === 'trueFunc' ) {
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cValue = cloakFunc(function(){ return true; });
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} else if ( cValue === 'falseFunc' ) {
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cValue = cloakFunc(function(){ return false; });
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} else if ( /^-?\d+$/.test(cValue) ) {
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cValue = parseInt(cValue);
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if ( isNaN(cValue) ) { return; }
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if ( Math.abs(cValue) > 0x7FFF ) { return; }
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} else if ( trusted ) {
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if ( cValue.startsWith('{') && cValue.endsWith('}') ) {
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try { cValue = JSON.parse(cValue).value; } catch(ex) { return; }
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}
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} else {
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return;
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}
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if ( options.includes('asFunction') ) {
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cValue = ( ) => cValue;
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} else if ( options.includes('asCallback') ) {
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cValue = ( ) => (( ) => cValue);
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} else if ( options.includes('asResolved') ) {
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cValue = Promise.resolve(cValue);
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} else if ( options.includes('asRejected') ) {
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cValue = Promise.reject(cValue);
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}
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let aborted = false;
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const mustAbort = function(v) {
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if ( trusted ) { return false; }
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if ( aborted ) { return true; }
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aborted =
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(v !== undefined && v !== null) &&
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(cValue !== undefined && cValue !== null) &&
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(typeof v !== typeof cValue);
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return aborted;
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};
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// https://github.com/uBlockOrigin/uBlock-issues/issues/156
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// Support multiple trappers for the same property.
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const trapProp = function(owner, prop, configurable, handler) {
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if ( handler.init(configurable ? owner[prop] : cValue) === false ) { return; }
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const odesc = Object.getOwnPropertyDescriptor(owner, prop);
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let prevGetter, prevSetter;
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if ( odesc instanceof Object ) {
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owner[prop] = cValue;
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if ( odesc.get instanceof Function ) {
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prevGetter = odesc.get;
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}
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if ( odesc.set instanceof Function ) {
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prevSetter = odesc.set;
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}
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}
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try {
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objectDefineProperty(owner, prop, {
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configurable,
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get() {
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if ( prevGetter !== undefined ) {
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prevGetter();
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}
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return handler.getter(); // cValue
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},
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set(a) {
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if ( prevSetter !== undefined ) {
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prevSetter(a);
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}
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handler.setter(a);
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}
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});
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} catch(ex) {
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}
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};
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const trapChain = function(owner, chain) {
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const pos = chain.indexOf('.');
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if ( pos === -1 ) {
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trapProp(owner, chain, false, {
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v: undefined,
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init: function(v) {
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if ( mustAbort(v) ) { return false; }
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this.v = v;
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return true;
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},
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getter: function() {
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return document.currentScript === thisScript
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? this.v
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: cValue;
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},
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setter: function(a) {
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if ( mustAbort(a) === false ) { return; }
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cValue = a;
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}
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});
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return;
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}
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const prop = chain.slice(0, pos);
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const v = owner[prop];
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chain = chain.slice(pos + 1);
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if ( v instanceof Object || typeof v === 'object' && v !== null ) {
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trapChain(v, chain);
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return;
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}
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trapProp(owner, prop, true, {
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v: undefined,
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init: function(v) {
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this.v = v;
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return true;
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},
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getter: function() {
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return this.v;
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},
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setter: function(a) {
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this.v = a;
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if ( a instanceof Object ) {
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trapChain(a, chain);
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}
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}
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});
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};
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trapChain(window, chain);
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}
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runAt(( ) => {
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setConstant(chain, cValue);
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}, options);
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}
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/*******************************************************************************
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Injectable scriptlets
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@ -1029,193 +1231,13 @@ builtinScriptlets.push({
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aliases: [ 'set.js' ],
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fn: setConstant,
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dependencies: [
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'run-at.fn',
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'set-constant-core.fn'
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],
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});
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function setConstant(
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arg1 = '',
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arg2 = '',
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arg3 = ''
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...args
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) {
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const details = typeof arg1 !== 'object'
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? { prop: arg1, value: arg2 }
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: arg1;
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if ( arg3 !== '' ) {
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if ( /^\d$/.test(arg3) ) {
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details.options = [ arg3 ];
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} else {
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details.options = Array.from(arguments).slice(2);
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}
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}
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const { prop: chain = '', value: cValue = '' } = details;
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if ( typeof chain !== 'string' ) { return; }
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if ( chain === '' ) { return; }
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const options = details.options || [];
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function setConstant(chain, cValue) {
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const trappedProp = (( ) => {
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const pos = chain.lastIndexOf('.');
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if ( pos === -1 ) { return chain; }
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return chain.slice(pos+1);
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})();
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if ( trappedProp === '' ) { return; }
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const thisScript = document.currentScript;
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const objectDefineProperty = Object.defineProperty.bind(Object);
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const cloakFunc = fn => {
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objectDefineProperty(fn, 'name', { value: trappedProp });
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const proxy = new Proxy(fn, {
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defineProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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deleteProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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get(target, prop) {
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if ( prop === 'toString' ) {
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return function() {
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return `function ${trappedProp}() { [native code] }`;
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}.bind(null);
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}
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return Reflect.get(...arguments);
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},
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});
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return proxy;
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};
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if ( cValue === 'undefined' ) {
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cValue = undefined;
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} else if ( cValue === 'false' ) {
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cValue = false;
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} else if ( cValue === 'true' ) {
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cValue = true;
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} else if ( cValue === 'null' ) {
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cValue = null;
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} else if ( cValue === "''" ) {
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cValue = '';
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} else if ( cValue === '[]' ) {
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cValue = [];
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} else if ( cValue === '{}' ) {
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cValue = {};
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} else if ( cValue === 'noopFunc' ) {
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cValue = cloakFunc(function(){});
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} else if ( cValue === 'trueFunc' ) {
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cValue = cloakFunc(function(){ return true; });
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} else if ( cValue === 'falseFunc' ) {
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cValue = cloakFunc(function(){ return false; });
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} else if ( /^-?\d+$/.test(cValue) ) {
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cValue = parseInt(cValue);
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if ( isNaN(cValue) ) { return; }
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if ( Math.abs(cValue) > 0x7FFF ) { return; }
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} else {
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return;
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}
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if ( options.includes('asFunction') ) {
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cValue = ( ) => cValue;
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} else if ( options.includes('asCallback') ) {
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cValue = ( ) => (( ) => cValue);
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} else if ( options.includes('asResolved') ) {
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cValue = Promise.resolve(cValue);
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} else if ( options.includes('asRejected') ) {
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cValue = Promise.reject(cValue);
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}
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let aborted = false;
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const mustAbort = function(v) {
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if ( aborted ) { return true; }
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aborted =
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(v !== undefined && v !== null) &&
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(cValue !== undefined && cValue !== null) &&
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(typeof v !== typeof cValue);
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return aborted;
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};
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// https://github.com/uBlockOrigin/uBlock-issues/issues/156
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// Support multiple trappers for the same property.
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const trapProp = function(owner, prop, configurable, handler) {
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if ( handler.init(configurable ? owner[prop] : cValue) === false ) { return; }
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const odesc = Object.getOwnPropertyDescriptor(owner, prop);
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let prevGetter, prevSetter;
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if ( odesc instanceof Object ) {
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owner[prop] = cValue;
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if ( odesc.get instanceof Function ) {
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prevGetter = odesc.get;
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}
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if ( odesc.set instanceof Function ) {
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prevSetter = odesc.set;
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}
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}
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try {
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objectDefineProperty(owner, prop, {
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configurable,
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get() {
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if ( prevGetter !== undefined ) {
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prevGetter();
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}
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return handler.getter(); // cValue
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},
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set(a) {
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if ( prevSetter !== undefined ) {
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prevSetter(a);
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}
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handler.setter(a);
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}
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});
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} catch(ex) {
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}
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};
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const trapChain = function(owner, chain) {
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const pos = chain.indexOf('.');
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if ( pos === -1 ) {
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trapProp(owner, chain, false, {
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v: undefined,
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init: function(v) {
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if ( mustAbort(v) ) { return false; }
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this.v = v;
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return true;
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},
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getter: function() {
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return document.currentScript === thisScript
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? this.v
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: cValue;
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},
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setter: function(a) {
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if ( mustAbort(a) === false ) { return; }
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cValue = a;
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}
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});
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return;
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}
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const prop = chain.slice(0, pos);
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const v = owner[prop];
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chain = chain.slice(pos + 1);
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if ( v instanceof Object || typeof v === 'object' && v !== null ) {
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trapChain(v, chain);
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return;
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}
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trapProp(owner, prop, true, {
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v: undefined,
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init: function(v) {
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this.v = v;
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return true;
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},
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getter: function() {
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return this.v;
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},
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setter: function(a) {
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this.v = a;
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if ( a instanceof Object ) {
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trapChain(a, chain);
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}
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}
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});
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};
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trapChain(window, chain);
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}
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runAt(( ) => {
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setConstant(chain, cValue);
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}, options);
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setConstantCore(false, ...args);
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}
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/******************************************************************************/
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@ -2338,3 +2360,20 @@ function sed(
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}
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'trusted-set-constant.js',
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requiresTrust: true,
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aliases: [ 'trusted-set' ],
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fn: trustedSetConstant,
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dependencies: [
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'set-constant-core.fn'
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],
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});
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function trustedSetConstant(
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...args
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) {
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setConstantCore(true, ...args);
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}
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/******************************************************************************/
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