25 lines
763 B
TypeScript
25 lines
763 B
TypeScript
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import { nanoid } from 'nanoid';
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import path from 'path';
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/**
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* Safely extracts the file extension from a filename.
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* Returns an empty string if no extension is found.
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*/
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export function getExtension(filename: string): string {
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if (!filename || typeof filename !== 'string') return '';
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const ext = path.extname(filename).split('.');
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return ext.length > 1 ? ext[ext.length - 1] : '';
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}
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/**
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* Generates a unique file key for storage, preserving the file extension.
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* Throws an error if the filename is invalid or has no extension.
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*/
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export function generateFileKey(fileName: string): string {
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const ext = getExtension(fileName);
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if (!ext) {
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throw new Error('Invalid file name or missing file extension');
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}
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return `${nanoid()}.${ext}`;
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}
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