1 files changed, 109 insertions, 0 deletions
diff --git a/data/extensions/uBlock0@raymondhill.net/js/resources/proxy-apply.js b/data/extensions/uBlock0@raymondhill.net/js/resources/proxy-apply.js
new file mode 100644
index 0000000..60326f5
--- /dev/null
+++ b/data/extensions/uBlock0@raymondhill.net/js/resources/proxy-apply.js
@@ -0,0 +1,109 @@
+/*******************************************************************************
+
+    uBlock Origin - a comprehensive, efficient content blocker
+    Copyright (C) 2019-present Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+
+*/
+
+import { registerScriptlet } from './base.js';
+
+/******************************************************************************/
+
+export function proxyApplyFn(
+    target = '',
+    handler = ''
+) {
+    let context = globalThis;
+    let prop = target;
+    for (;;) {
+        const pos = prop.indexOf('.');
+        if ( pos === -1 ) { break; }
+        context = context[prop.slice(0, pos)];
+        if ( context instanceof Object === false ) { return; }
+        prop = prop.slice(pos+1);
+    }
+    const fn = context[prop];
+    if ( typeof fn !== 'function' ) { return; }
+    if ( proxyApplyFn.CtorContext === undefined ) {
+        proxyApplyFn.ctorContexts = [];
+        proxyApplyFn.CtorContext = class {
+            constructor(...args) {
+                this.init(...args);
+            }
+            init(callFn, callArgs) {
+                this.callFn = callFn;
+                this.callArgs = callArgs;
+                return this;
+            }
+            reflect() {
+                const r = Reflect.construct(this.callFn, this.callArgs);
+                this.callFn = this.callArgs = this.private = undefined;
+                proxyApplyFn.ctorContexts.push(this);
+                return r;
+            }
+            static factory(...args) {
+                return proxyApplyFn.ctorContexts.length !== 0
+                    ? proxyApplyFn.ctorContexts.pop().init(...args)
+                    : new proxyApplyFn.CtorContext(...args);
+            }
+        };
+        proxyApplyFn.applyContexts = [];
+        proxyApplyFn.ApplyContext = class {
+            constructor(...args) {
+                this.init(...args);
+            }
+            init(callFn, thisArg, callArgs) {
+                this.callFn = callFn;
+                this.thisArg = thisArg;
+                this.callArgs = callArgs;
+                return this;
+            }
+            reflect() {
+                const r = Reflect.apply(this.callFn, this.thisArg, this.callArgs);
+                this.callFn = this.thisArg = this.callArgs = this.private = undefined;
+                proxyApplyFn.applyContexts.push(this);
+                return r;
+            }
+            static factory(...args) {
+                return proxyApplyFn.applyContexts.length !== 0
+                    ? proxyApplyFn.applyContexts.pop().init(...args)
+                    : new proxyApplyFn.ApplyContext(...args);
+            }
+        };
+    }
+    const fnStr = fn.toString();
+    const toString = (function toString() { return fnStr; }).bind(null);
+    const proxyDetails = {
+        apply(target, thisArg, args) {
+            return handler(proxyApplyFn.ApplyContext.factory(target, thisArg, args));
+        },
+        get(target, prop) {
+            if ( prop === 'toString' ) { return toString; }
+            return Reflect.get(target, prop);
+        },
+    };
+    if ( fn.prototype?.constructor === fn ) {
+        proxyDetails.construct = function(target, args) {
+            return handler(proxyApplyFn.CtorContext.factory(target, args));
+        };
+    }
+    context[prop] = new Proxy(fn, proxyDetails);
+}
+registerScriptlet(proxyApplyFn, {
+    name: 'proxy-apply.fn',
+});