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security: use rtrim, not unsafe /X+$/ #1260

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merged 3 commits into from
Jun 3, 2018
Merged

security: use rtrim, not unsafe /X+$/ #1260

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7e5a727
security: rtrim, not unsafe /X+$/ idiom
davisjam Apr 26, 2018
2e05c77
address review comments
davisjam Jun 2, 2018
0610f9f
remove unnecessary if check
davisjam Jun 2, 2018
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36 changes: 34 additions & 2 deletions lib/marked.js
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Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,7 @@ Lexer.prototype.token = function(src, top) {
this.tokens.push({
type: 'code',
text: !this.options.pedantic
? cap.replace(/\n+$/, '')
? rtrim(cap, '\n')
: cap
});
continue;
Expand Down Expand Up @@ -1303,7 +1303,7 @@ function resolveUrl(base, href) {
if (/^[^:]+:\/*[^/]*$/.test(base)) {
baseUrls[' ' + base] = base + '/';
} else {
baseUrls[' ' + base] = base.replace(/[^/]*$/, '');
baseUrls[' ' + base] = rtrim(base, '/', true);
}
}
base = baseUrls[' ' + base];
Expand Down Expand Up @@ -1355,6 +1355,38 @@ function splitCells(tableRow, count) {
return cells;
}

// Return str with all trailing {c | all but c} removed
// allButC: Default false
function rtrim(str, c, allButC) {
if (typeof allButC === 'undefined') {
allButC = false;
} else {
allButC = true;
}
var mustMatchC = !allButC;
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@UziTech UziTech May 9, 2018 •
edited
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If someone calls rtrim(cap, '\n', false) allButC will be true? seems like a potential source of many future errors.

I would just replace the mustMatchC's below with !allButC

It should be fine for allButC to be truthy or falsey

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I'll tweak the naming.


if (str.length === 0) {
return '';
}

// ix+1 of leftmost that fits description
// i.e. the length of the string we should return
var curr = str.length;

while (curr > 0) {
var currChar = str.charAt(curr - 1);
if (mustMatchC && currChar === c) {
curr--;
} else if (!mustMatchC && currChar !== c) {
curr--;
} else {
break;
}
}

return str.substr(0, curr);
}

/**
* Marked
*/
Expand Down