fix: Refactor isURL() to use Built-in URL Constructor#3061
fix: Refactor isURL() to use Built-in URL Constructor#3061lahirumaramba merged 2 commits intomainfrom
isURL() to use Built-in URL Constructor#3061Conversation
Summary of ChangesHello @lahirumaramba, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a crucial security enhancement by addressing a potential ReDoS vulnerability in the Highlights
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Code Review
This pull request correctly addresses a potential Regular Expression Denial of Service (ReDoS) vulnerability in the URL validator. The fix involves making the hostname validation regex stricter by removing an optional character within a repeated group, which prevents catastrophic backtracking. The accompanying tests are well-designed, verifying the fix and ensuring there are no performance regressions with long or invalid URLs. I have one suggestion to further simplify the regex for improved readability and performance.
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isURL() to use Built-in URL Constructor
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Code Review
This pull request successfully refactors the isURL() function to utilize the built-in URL constructor, which is a significant improvement for security by mitigating ReDoS vulnerabilities and enhancing code simplicity. The addition of new tests for long URLs and ReDoS checks is also highly commendable. However, there are a couple of points regarding validation behavior that need clarification or adjustment to ensure consistency and maintain the desired level of strictness.
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Code Review
This pull request refactors the isURL() validator to use the built-in URL constructor, replacing the previous url.parse() and regular expression-based approach. This is a great improvement for security, as it mitigates a potential ReDoS vulnerability. The changes also include stricter validation for hostnames and pathnames to maintain backward compatibility, and new tests have been added to verify the fix and prevent regressions. My main feedback is a suggestion to improve the readability of the hostname validation logic, but overall this is a solid change.
| if (!/^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?)*$/.test(hostname)) { | ||
| // Check for IPv6 literals which are valid but behave differently. | ||
| // Node 'new URL' keeps brackets for IPv6: [::1] -> [::1] | ||
| // Check for IPv6 address (simple check for brackets) | ||
| if (!/^\[[a-fA-F0-9:.]+\]$/.test(hostname)) { | ||
| return false; | ||
| } | ||
| } |
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The nested if condition for hostname validation is a bit difficult to read. You can improve clarity by flattening the logic. Check for a valid domain and a valid IPv6 literal separately and then combine the results. This makes the code's intent—that the hostname must be one of the two—more explicit.
const isValidDomain = /^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?)*$/.test(hostname);
// An IPv6 literal is enclosed in brackets. `new URL()` has already validated the contents.
const isIPv6Literal = /^\[[a-fA-F0-9:.]+\]$/.test(hostname);
if (!isValidDomain && !isIPv6Literal) {
return false;
}
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Replace the RegEx-based validation in
isURL()(which was prone to ReDoS) with the standard built-inURLconstructor. This improves security, code simplicity, and correctness by leveraging the platform's native URL parsing.