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// URL validation utility |
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|
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/** |
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* Checks if a string is a valid URL for the form builder. |
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* Allows domains, localhost, IPv4, IPv6, with optional port and path. |
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* Disallows multiple protocols and garbage before the URL. |
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*/ |
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export function isValidUrl(urlInput: string): boolean { |
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if (!urlInput) return false |
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const url = urlInput.trim() |
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// Allow domains, localhost, IPv4, IPv6 |
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const startPattern = |
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/^(https?:\/\/)?([a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*|localhost|\d{1,3}(\.\d{1,3}){3}|\[[0-9a-fA-F:]+\])(:\d+)?(\/|$)/ |
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if (!startPattern.test(url)) return false |
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// Disallow protocol more than once |
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const protocolMatches = url.match(/https?:\/\//gi) |
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if (protocolMatches && protocolMatches.length > 1) return false |
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// Use URL constructor for validation |
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let urlToTest = url |
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try { |
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if (!/^https?:\/\//i.test(url)) { |
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urlToTest = 'https://' + url |
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} |
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new URL(urlToTest) |
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return true |
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} catch { |
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return false |
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} |
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} |
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