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/*******************************************************************************
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 { parseReplaceFn } from './parse-replace.js';
import { proxyApplyFn } from './proxy-apply.js';
import { registerScriptlet } from './base.js';
import { safeSelf } from './safe-self.js';
import { validateConstantFn } from './set-constant.js';
/**
* @scriptlet trusted-replace-argument.js
*
* @description
* Replace an argument passed to a method. Requires a trusted source.
*
* @param propChain
* The property chain to the function which argument must be replaced when
* called.
*
* @param argposRaw
* The zero-based position of the argument in the argument list. Use a negative
* number for a position relative to the last argument. Use literal `this` to
* replace the value used in `prototype`-based methods.
*
* @param argraw
* The replacement value, validated using the same heuristic as with the
* `set-constant.js` scriptlet.
* If the replacement value matches `json:...`, the value will be the
* json-parsed string after `json:`.
* If the replacement value matches `repl:/.../.../`, the target argument will
* be replaced according the regex-replacement directive following `repl:`
*
* @param [, condition, pattern]
* Optional. The replacement will occur only when pattern matches the target
* argument.
*
* */
export function trustedReplaceArgument(
propChain = '',
argposRaw = '',
argraw = ''
) {
if ( propChain === '' ) { return; }
const safe = safeSelf();
const logPrefix = safe.makeLogPrefix('trusted-replace-argument', propChain, argposRaw, argraw);
const argoffset = parseInt(argposRaw, 10) || 0;
const extraArgs = safe.getExtraArgs(Array.from(arguments), 3);
const replacer = argraw.startsWith('repl:/') &&
parseReplaceFn(argraw.slice(5)) || undefined;
const value = replacer === undefined &&
validateConstantFn(true, argraw, extraArgs);
const reCondition = extraArgs.condition
? safe.patternToRegex(extraArgs.condition)
: /^/;
const getArg = context => {
if ( argposRaw === 'this' ) { return context.thisArg; }
const { callArgs } = context;
const argpos = argoffset >= 0 ? argoffset : callArgs.length - argoffset;
if ( argpos < 0 || argpos >= callArgs.length ) { return; }
context.private = { argpos };
return callArgs[argpos];
};
const setArg = (context, value) => {
if ( argposRaw === 'this' ) {
if ( value !== context.thisArg ) {
context.thisArg = value;
}
} else if ( context.private ) {
context.callArgs[context.private.argpos] = value;
}
};
proxyApplyFn(propChain, function(context) {
if ( argposRaw === '' ) {
safe.uboLog(logPrefix, `Arguments:\n${context.callArgs.join('\n')}`);
return context.reflect();
}
const argBefore = getArg(context);
if ( extraArgs.condition !== undefined ) {
if ( safe.RegExp_test.call(reCondition, argBefore) === false ) {
return context.reflect();
}
}
const argAfter = replacer && typeof argBefore === 'string'
? argBefore.replace(replacer.re, replacer.replacement)
: value;
if ( argAfter !== argBefore ) {
setArg(context, argAfter);
safe.uboLog(logPrefix, `Replaced argument:\nBefore: ${JSON.stringify(argBefore)}\nAfter: ${argAfter}`);
}
return context.reflect();
});
}
registerScriptlet(trustedReplaceArgument, {
name: 'trusted-replace-argument.js',
requiresTrust: true,
dependencies: [
parseReplaceFn,
proxyApplyFn,
safeSelf,
validateConstantFn,
],
});
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