1 files changed, 0 insertions, 448 deletions
diff --git a/data/extensions/jid1-KtlZuoiikVfFew@jetpack/common/checks.js b/data/extensions/jid1-KtlZuoiikVfFew@jetpack/common/checks.js
deleted file mode 100644
index a9e3cc8..0000000
--- a/data/extensions/jid1-KtlZuoiikVfFew@jetpack/common/checks.js
+++ /dev/null
@@ -1,448 +0,0 @@
-/**
-* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
-* *
-* Copyright (C) 2018 Nathan Nichols
-* Copyright (C) 2022 Yuchen Pei
-*
-* This file is part of GNU LibreJS.
-*
-* GNU LibreJS 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.
-*
-* GNU LibreJS 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 GNU LibreJS.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-const acorn = require('acorn');
-const licenses = require('./license_definitions.json');
-const { patternUtils } = require('./pattern_utils.js');
-const { makeDebugLogger } = require('./debug.js');
-const fnameData = require('./fname_data.json').fname_data;
-
-const LIC_RE = /@licstartThefollowingistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)(.*)?@licendTheaboveistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)/mi;
-
-/*
-  NONTRIVIAL THINGS:
-  - Fetch
-  - XMLhttpRequest
-  - eval()
-  - ?
-  JAVASCRIPT CAN BE FOUND IN:
-  - Event handlers (onclick, onload, onsubmit, etc.)
-  - <script>JS</script>
-  - <script src="/JS.js"></script>
-  WAYS TO DETERMINE PASS/FAIL:
-  - "// @license [magnet link] [identifier]" then "// @license-end" (may also use /* comments)
-  - Automatic whitelist: (http://bzr.savannah.gnu.org/lh/librejs/dev/annotate/head:/data/script_libraries/script-libraries.json_
-*/
-// These are objects that it will search for in an initial regex pass over non-free scripts.
-const RESERVED_OBJECTS = [
-  //"document",
-  //"window",
-  'fetch',
-  'XMLHttpRequest',
-  'chrome', // only on chrome
-  'browser', // only on firefox
-  'eval'
-];
-const LOOPKEYS = new Set(['for', 'if', 'while', 'switch']);
-const OPERATORS = new Set(['||', '&&', '=', '==', '++', '--', '+=', '-=', '*']);
-// @license match, second and third capture groups are canonicalUrl
-// and license name
-// Caveat: will not work in a commented out star comments:
-// '// /* @license */ ... /* @license-end */' will be checked, though
-// the whole thing is a comment
-const OPENING_LICENSE_RE1 = /^\s*\/\/\s*@license\s+(\S+)\s+(\S+).*$/mi;
-const OPENING_LICENSE_RE2 = /\/\*\s*?@license\s+(\S+)\s+([^/*]+).*\*\//mi;
-const CLOSING_LICENSE_RE1 = /^\s*\/\/\s*@license-end\s*/mi;
-const CLOSING_LICENSE_RE2 = /\/\*\s*@license-end\s*\*\//mi;
-/**
-*	If this is true, it evaluates entire scripts instead of returning as soon as it encounters a violation.
-*
-*	Also, it controls whether or not this part of the code logs to the console.
-*
-*/
-const DEBUG = false; // debug the JS evaluation
-const PRINT_DEBUG = false;
-const dbg_print = makeDebugLogger('checks.js', PRINT_DEBUG, Date.now());
-
-/**
- * stripLicenseToRegexp
- *
- * Removes all non-alphanumeric characters except for the 
- * special tokens, and replace the text values that are 
- * hardcoded in license_definitions.js.  Puts the result in
- * the regex field of the fragments.
- *
- */
-const stripLicenseToRegexp = function(license) {
-  for (const frag of license.licenseFragments) {
-    frag.regex = patternUtils.removeNonalpha(frag.text);
-    frag.regex = new RegExp(
-      patternUtils.replaceTokens(frag.regex), '');
-  }
-};
-
-const init = function() {
-  console.log('initializing regexes');
-  for (const key in licenses) {
-    stripLicenseToRegexp(licenses[key]);
-  }
-}
-
-/**
-*
-*	Takes in the declaration that has been preprocessed and 
-*	tests it against regexes in licenses.
-*/
-const searchTable = function(strippedComment) {
-  const stripped = patternUtils.removeNonalpha(strippedComment);
-  // looking up license
-  for (const key in licenses) {
-    const license = licenses[key];
-    for (const frag of license.licenseFragments) {
-      if (frag.regex.test(stripped)) {
-        return license.licenseName;
-      }
-    }
-  }
-  console.log('No global license found.');
-  return null;
-}
-
-/**
- * Checks whether licenseText, modulo whitespace, starts with
- * a @licstart .. @licend with a free license, returns the license name
- * if so, and null otherwise.
- */
-const checkLicenseText = function(licenseText) {
-  if (licenseText === undefined || licenseText === null) {
-    return null;
-  }
-  // remove whitespace
-  const stripped = patternUtils.removeWhitespace(licenseText);
-  // Search for @licstart/@licend
-  const matches = stripped.match(LIC_RE);
-  return matches && searchTable(matches[0]);
-};
-
-//************************this part can be tested in the HTML file index.html's script test.js****************************
-
-/**
- * Checks whether script is trivial by analysing its tokens.
- *
- * Returns an array of
- * [flag (boolean, true if trivial), reason (string, human readable report)].
- */
-function fullEvaluate(script) {
-  if (script === undefined || script == '') {
-    return [true, 'Harmless null script'];
-  }
-
-  let tokens;
-
-  try {
-    tokens = acorn.tokenizer(script);
-  } catch (e) {
-    console.warn('Tokenizer could not be initiated (probably invalid code)');
-    return [false, 'Tokenizer could not be initiated (probably invalid code)'];
-  }
-  try {
-    var toke = tokens.getToken();
-  } catch (e) {
-    console.log(script);
-    console.log(e);
-    console.warn('couldn\'t get first token (probably invalid code)');
-    console.warn('Continuing evaluation');
-  }
-
-  let amtloops = 0;
-  let definesFunctions = false;
-
-  /**
-  * Given the end of an identifer token, it tests for parentheses
-  */
-  function is_bsn(end) {
-    let i = 0;
-    while (script.charAt(end + i).match(/\s/g) !== null) {
-      i++;
-      if (i >= script.length - 1) {
-        return false;
-      }
-    }
-    return script.charAt(end + i) == '[';
-  }
-
-  function evaluateByTokenValue(toke) {
-    const value = toke.value;
-    if (OPERATORS.has(value)) {
-      // It's just an operator. Javascript doesn't have operator overloading so it must be some
-      // kind of primitive (I.e. a number)
-    } else {
-      const status = fnameData[value];
-      if (status === true) { // is the identifier banned?
-        dbg_print('%c NONTRIVIAL: nontrivial token: \'' + value + '\'', 'color:red');
-        if (DEBUG == false) {
-          return [false, 'NONTRIVIAL: nontrivial token: \'' + value + '\''];
-        }
-      } else if (status === false || status === undefined) {// is the identifier not banned or user defined?
-        // Is there bracket suffix notation?
-        if (is_bsn(toke.end)) {
-          dbg_print('%c NONTRIVIAL: Bracket suffix notation on variable \'' + value + '\'', 'color:red');
-          if (DEBUG == false) {
-            return [false, '%c NONTRIVIAL: Bracket suffix notation on variable \'' + value + '\''];
-          }
-        }
-      } else {
-        dbg_print('trivial token:' + value);
-      }
-    }
-    return [true, ''];
-  }
-
-  function evaluateByTokenTypeKeyword(keyword) {
-    if (toke.type.keyword == 'function') {
-      dbg_print('%c NOTICE: Function declaration.', 'color:green');
-      definesFunctions = true;
-    }
-
-    if (LOOPKEYS.has(keyword)) {
-      amtloops++;
-      if (amtloops > 3) {
-        dbg_print('%c NONTRIVIAL: Too many loops/conditionals.', 'color:red');
-        if (DEBUG == false) {
-          return [false, 'NONTRIVIAL: Too many loops/conditionals.'];
-        }
-      }
-    }
-    return [true, ''];
-  }
-
-  while (toke !== undefined && toke.type != acorn.tokTypes.eof) {
-    if (toke.type.keyword !== undefined) {
-      //dbg_print("Keyword:");
-      //dbg_print(toke);
-
-      // This type of loop detection ignores functional loop alternatives and ternary operators
-      const tokeTypeRes = evaluateByTokenTypeKeyword(toke.type.keyword);
-      if (tokeTypeRes[0] === false) {
-        return tokeTypeRes;
-      }
-    } else if (toke.value !== undefined) {
-      const tokeValRes = evaluateByTokenValue(toke);
-      if (tokeValRes[0] === false) {
-        return tokeValRes;
-      }
-    }
-    // If not a keyword or an identifier it's some kind of operator, field parenthesis, brackets
-    try {
-      toke = tokens.getToken();
-    } catch (e) {
-      dbg_print('Denied script because it cannot be parsed.');
-      return [false, 'NONTRIVIAL: Cannot be parsed. This could mean it is a 404 error.'];
-    }
-  }
-
-  dbg_print('%cAppears to be trivial.', 'color:green;');
-  if (definesFunctions === true)
-    return [true, 'Script appears to be trivial but defines functions.'];
-  else
-    return [true, 'Script appears to be trivial.'];
-}
-
-
-//****************************************************************************************************
-/**
-*	This is the entry point for full code evaluation for triviality.
-*
-*	Performs the initial pass on code to see if it needs to be completely parsed
-*
-*	This can only determine if a script is bad, not if it's good
-*
-*	If it passes the intitial pass, it runs the full pass and returns the result
-
-*	It returns an array of [flag (boolean, false if "bad"), reason (string, human readable report)]
-*
-*/
-function evaluate(script, name) {
-  const reservedResult = evaluateForReservedObj(script, name);
-  if (reservedResult[0] === true) {
-    dbg_print('%c pass', 'color:green;');
-  } else {
-    return reservedResult;
-  }
-
-  return fullEvaluate(script);
-}
-
-function evaluateForReservedObj(script, name) {
-  function reservedObjectRegex(object) {
-    const arithOperators = '\\+\\-\\*\\/\\%\\=';
-    return new RegExp('(?:[^\\w\\d]|^|(?:' + arithOperators + '))' + object + '(?:\\s*?(?:[\\;\\,\\.\\(\\[])\\s*?)', 'g');
-  }
-  const mlComment = /\/\*([\s\S]+?)\*\//g;
-  const ilComment = /\/\/.+/gm;
-  const temp = script.replace(/'.+?'+/gm, '\'string\'').replace(/".+?"+/gm, '"string"').replace(mlComment, '').replace(ilComment, '');
-  dbg_print('%c ------evaluation results for ' + name + '------', 'color:white');
-  dbg_print('Script accesses reserved objects?');
-
-  // 	This is where individual "passes" are made over the code
-  for (const reserved of RESERVED_OBJECTS) {
-    if (reservedObjectRegex(reserved).exec(temp) != null) {
-      dbg_print('%c fail', 'color:red;');
-      return [false, 'Script uses a reserved object (' + reserved + ')'];
-    }
-  }
-  return [true, 'Reserved object not found.'];
-}
-
-/**
- * Checks whether url is the magnet link of a license.
- * 
- * Returns the licenseName if so, otherwise returns null.  If a key is
- * supplied, checks for the license with the key only.
- */
-function checkMagnet(url, key = null) {
-  const fixedUrl = url.replace(/&amp;/g, '&');
-  // Match by magnet link
-  const checkLicenseMagnet = license => {
-    for (const cUrl of license.canonicalUrl) {
-      if (cUrl.startsWith('magnet:') && fixedUrl === cUrl) {
-        return license.licenseName;
-      }
-    }
-    return null;
-  }
-
-  if (key) {
-    try {
-      return checkLicenseMagnet(licenses[key]);
-    } catch (error) {
-      return null;
-    }
-  } else {
-    for (const key in licenses) {
-      const result = checkLicenseMagnet(licenses[key]);
-      if (result) return result;
-    }
-    return null;
-  }
-}
-
-
-/**
- *
- *	Evaluates the content of a script for licenses and triviality
- * scriptSrc: content of the script; name: script name; external:
- * whether the script is external
- *
- *	Returns
- *	[
- *		true (accepted) or false (denied),
- *		edited content,
- *		reason text
- *	]
- */
-function checkScriptSource(scriptSrc, name, external = false) {
-  let inSrc = scriptSrc.trim();
-  if (!inSrc) return [true, scriptSrc, 'Empty source.'];
-
-  // Check for @licstart .. @licend method
-  const license = checkLicenseText(scriptSrc);
-  if (license) {
-    return [true, scriptSrc, `Licensed under: ${license}`];
-  }
-
-  let outSrc = '';
-  let reason = '';
-  let partsDenied = false;
-  let partsAccepted = false;
-
-  function checkTriviality(s) {
-    if (!patternUtils.removeJsComments(s).trim()) {
-      return true; // empty, ignore it
-    }
-    const [trivial, message] = external ?
-      [false, 'External script with no known license']
-      : evaluate(s, name);
-    if (trivial) {
-      partsAccepted = true;
-      outSrc += s;
-    } else {
-      partsDenied = true;
-      if (s.startsWith('javascript:'))
-        outSrc += `# LIBREJS BLOCKED: ${message}`;
-      else
-        outSrc += `/*\nLIBREJS BLOCKED: ${message}\n*/`;
-    }
-    reason += `\n${message}`;
-  }
-
-  // Consume inSrc by checking licenses in all @license / @license-end
-  // blocks and triviality outside these blocks
-  while (inSrc) {
-    const openingMatch1 = OPENING_LICENSE_RE1.exec(inSrc);
-    const openingMatch2 = OPENING_LICENSE_RE2.exec(inSrc);
-    const openingMatch =
-      (openingMatch1 && openingMatch2) ?
-        (openingMatch1.index < openingMatch2.index ? openingMatch1
-          : openingMatch2)
-        : (openingMatch1 || openingMatch2);
-    const openingIndex = openingMatch ? openingMatch.index : inSrc.length;
-    // checks the triviality of the code before the license tag, if any
-    checkTriviality(inSrc.substring(0, openingIndex));
-    inSrc = inSrc.substring(openingIndex);
-    if (!inSrc) break;
-
-    // checks the remaining part, that starts with an @license
-    const closureMatch1 = CLOSING_LICENSE_RE1.exec(inSrc);
-    const closureMatch2 = CLOSING_LICENSE_RE2.exec(inSrc);
-    const closureMatch =
-      (closureMatch1 && closureMatch2) ?
-        (closureMatch1.index < closureMatch2.index ? closureMatch1
-          : closureMatch2)
-        : (closureMatch1 || closureMatch2);
-    if (!closureMatch) {
-      const msg = 'ERROR: @license with no @license-end';
-      return [false, `\n/*\n ${msg} \n*/\n`, msg];
-    }
-    const closureEndIndex = closureMatch.index + closureMatch[0].length;
-
-    if (!(Array.isArray(openingMatch) && openingMatch.length >= 3)) {
-      return [false, 'Malformed or unrecognized license tag.'];
-    }
-    const licenseName = checkMagnet(openingMatch[1]);
-    let message;
-    if (licenseName) {
-      outSrc += inSrc.substr(0, closureEndIndex);
-      partsAccepted = true;
-      message = `Recognized license: "${licenseName}".`
-    } else {
-      outSrc += `\n/*\n${message}\n*/\n`;
-      partsDenied = true;
-      message = `Unrecognized license tag: "${openingMatch[0]}"`;
-    }
-    reason += `\n${message}`;
-
-    // trim off everything we just evaluated
-    inSrc = inSrc.substring(closureEndIndex).trim();
-  }
-
-  if (partsDenied) {
-    if (partsAccepted) {
-      reason = `Some parts of the script have been disabled (check the source for details).\n^--- ${reason}`;
-    }
-    return [false, outSrc, reason];
-  }
-
-  return [true, scriptSrc, reason];
-}
-
-module.exports = { init, checkLicenseText, checkMagnet, checkScriptSource };