44 行
1.5 KiB
TypeScript
44 行
1.5 KiB
TypeScript
export function fileExtension(pathOrName: string): string {
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const clean = pathOrName.split(/[?#]/, 1)[0] ?? ''
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const name = clean.split('/').pop() ?? clean
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const index = name.lastIndexOf('.')
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return index > 0 ? name.slice(index + 1).toLowerCase() : ''
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}
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export function sanitizeFileName(name: string, fallback = 'file'): string {
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const sanitized = name
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.trim()
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.replace(/[\\/:*?"<>|\u0000-\u001f]/g, '_')
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.replace(/\s+/g, ' ')
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return sanitized || fallback
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}
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/** Resolve an RFC 5987/6266 filename from a Content-Disposition header. */
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export function parseContentDispositionFileName(header: string): string | null {
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const encoded = header.match(/filename\*=(?:[^']*'[^']*')?([^;\s]+)/i)?.[1]
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if (encoded) {
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try {
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return sanitizeFileName(decodeURIComponent(encoded.replace(/['"]/g, '')))
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} catch {
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// Fall through to the non-encoded forms.
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}
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}
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const quoted = header.match(/filename="([^"]+)"/i)?.[1]
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if (quoted?.trim()) return sanitizeFileName(quoted)
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const plain = header.match(/filename=([^;\s"]+)/i)?.[1]
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return plain?.trim() ? sanitizeFileName(plain) : null
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}
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export function fileNameFromUrl(url: string, fallback = 'download'): string {
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try {
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const pathname = new URL(url).pathname
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const candidate = pathname.split('/').filter(Boolean).at(-1)
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return candidate ? sanitizeFileName(decodeURIComponent(candidate), fallback) : fallback
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} catch {
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const candidate = url.split(/[?#]/, 1)[0]?.split('/').filter(Boolean).at(-1)
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return candidate ? sanitizeFileName(candidate, fallback) : fallback
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}
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}
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