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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
* *
* Copyright (C) 2011, 2012, 2013, 2014 Loic J. Duros
* Copyright (C) 2014, 2015 Nik Nyby
*
* 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/>.
*/
var licenses = require('./license_definitions');
var simpleStorage = require("sdk/simple-storage");
const LAZY = licenses.types.LAZY;
var licenseRegex = [];
const END_OF_SCRIPT = require('../html_script_finder/bug_fix').END_OF_SCRIPT;
const types = require("./constant_types");
const token = types.token;
var patternUtils = require('./pattern_utils').patternUtils;
var licStartLicEndRe = /@licstartThefollowingistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)(.*)?@licendTheaboveistheentirelicensenoticefortheJavaScriptcodeinthis(?:page|file)/mi;
var licenseMagnet = /.*@license ?(magnet\:\?xt=urn\:btih\:[0-9A-Za-z]+).*/;
var licenseEndMagnet = /.*@license-end.*/i;
exports.freeCheck = {
initLicenses: function (licenses) {
for (var item in licenses) {
this.stripLicenseToRegexp(licenses[item]);
}
},
/**
* stripLicenseToRegexp
*
* Removes all non-alphanumeric characters except for the
* special tokens, and replace the text values that are
* hardcoded in license_definitions.js
*
*/
stripLicenseToRegexp: function (license) {
var i = 0,
max = license.licenseFragments.length,
item;
for (; i < max; i++) {
item = license.licenseFragments[i];
item.regex = patternUtils.removeNonalpha(item.text);
if (license.licenseFragments[i].type === LAZY) {
// do not permit words before. Since "Not" could be added
// and make it nonfree. e.g.: Not licensed under the GPLv3.
item.regex = '^(?!.*not).*' + item.regex;
}
item.regex = new RegExp(
patternUtils.replaceTokens(item.regex), 'i');
}
return license;
},
/**
* checkNodeFreeLicense
*
* Check if the node mentions a free license
* in one of its comments.
*
*/
checkNodeFreeLicense: function (n, queue) {
var strippedComment,
magnetLink,
comment = this.getComment(n),
list = licenses.licenses,
i, j,
max,
regex,
frag,
matchLicStart,
matchMagnet,
license,
isMagnetValid = false;
if (n.counter === 2 &&
n.parent != undefined &&
n.parent.type === token.SCRIPT &&
comment != undefined &&
comment != " "
) {
strippedComment = patternUtils.removeNonalpha(comment);
matchLicStart = strippedComment.match(licStartLicEndRe);
console.debug("matchMagnet is", matchMagnet);
if (matchLicStart) {
strippedComment = matchLicStart[1];
for (license in list) {
frag = list[license].licenseFragments;
max = list[license].licenseFragments.length;
for (i = 0; i < max; i++) {
if (frag[i].regex.test(strippedComment)) {
return {
licenseName: list[license].licenseName,
type: types.checkTypes.FREE
};
}
}
}
}
// check for @license -- @license-end notation.
return this.matchMagnet(comment, queue);
}
},
/**
* matchMagnet
* Attempts to find valid @license [magnet]
* and @license-end notation.
*/
matchMagnet: function (comment, queue) {
let matchMagnet = comment.match(licenseMagnet);
if (matchMagnet) {
let magnetLinkRe = new RegExp(
matchMagnet[1].replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&")
);
let list = licenses.licenses;
let queue_end = queue.length;
for (var license in list) {
frag = list[license].canonicalUrl;
console.debug("frag is ", frag);
if (frag != undefined) {
max = list[license].canonicalUrl.length;
console.debug("max is", max);
for (i = 0;i < max; i++) {
console.debug("current frag is", frag[i]);
if (frag[i].match(magnetLinkRe)) {
for (let i = 0; i < queue_end; i++) {
console.debug(queue[i]);
let n = queue[i];
comment = this.getComment(n);
if (comment != undefined &&
comment.match(licenseEndMagnet) &&
this.checkIsLastNode(n)
) {
// found a closing match. Just accept this script.
return {
licenseName: list[license].licenseName,
type: types.checkTypes.FREE_SINGLE_ITEM
};
}
}
}
}
}
}
}
return;
},
/**
* checkIsLastJsNode.
* returns true if n is the last node.
* Or if nodes before it are only comments etc (not valid code.)
* A special LibreJS node is appended at the end of a script tree to
* check if this is the last (and also for narcissus to keep the last comment
* in the tree.)
* TODO: Refactor LibreJS so that END nodes can have a comment.
*/
checkIsLastNode: function (n) {
// first check if the comment is part of the very last statement.
if (n.value == "this" && n.next == undefined) {
// just make sure the last node is indeed our harmless bit of
// js.
if (n.tokenizer) {
let source = n.tokenizer.source;
let substring = source.substr(n.start, n.end+23);
if (substring == END_OF_SCRIPT) {
return true;
}
else {
console.debug("substring is ", substring);
return false;
}
}
console.debug("Hurra! This is the end of our script");
return true;
}
// isn't our last node.
return false;
},
/**
* getComment
*
* Grab the comment(s) from the node. Concatenates
* multiple comments.
*
*/
getComment: function (n) {
var i = 0, length, comment = "";
if (n.blockComments == undefined || n.blockComments == " ") {
return;
}
length = n.blockComments.length;
if (length > 0) {
for (; i < length; i++) {
comment += n.blockComments[i];
}
}
if (comment == "") {
return;
}
return comment;
}
};
exports.freeCheck.initLicenses(licenses.licenses);
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