57 lines
1.7 KiB
TypeScript
57 lines
1.7 KiB
TypeScript
import { ALLOWED_IMAGE_TYPES } from '../validation/constants';
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export const ALLOWED_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.gif', '.webp'] as const;
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type FileLike = {
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type: string;
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name: string;
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};
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export function validateImageType(file: FileLike): boolean {
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return ALLOWED_IMAGE_TYPES.includes(file.type as (typeof ALLOWED_IMAGE_TYPES)[number]);
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}
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export function validateImageExtension(filename: string): boolean {
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const extension = filename.toLowerCase().substring(filename.lastIndexOf('.'));
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return ALLOWED_EXTENSIONS.includes(extension as (typeof ALLOWED_EXTENSIONS)[number]);
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}
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export function validateImageUpload(file: FileLike): { isValid: boolean; error?: string } {
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if (!validateImageType(file)) {
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return {
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isValid: false,
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error: 'Invalid file type. Only JPEG, PNG, GIF, and WebP files are allowed.'
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};
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}
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if (!validateImageExtension(file.name)) {
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return {
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isValid: false,
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error: 'Invalid file extension. Only .jpg, .jpeg, .png, .gif, and .webp files are allowed.'
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};
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}
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if (file.name.toLowerCase().includes('.svg')) {
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return {
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isValid: false,
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error: 'SVG files are not allowed for security reasons.'
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};
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}
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return { isValid: true };
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}
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export function sanitizeFilename(filename: string): string {
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let sanitized = filename.replace(/[\/\\]/g, '');
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sanitized = sanitized.replace(/[<>:"|?*]/g, '');
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if (sanitized.length > 255) {
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const extIndex = sanitized.lastIndexOf('.');
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const ext = extIndex !== -1 ? sanitized.substring(extIndex) : '';
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const name = extIndex !== -1 ? sanitized.substring(0, extIndex) : sanitized;
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sanitized = `${name.substring(0, 255 - ext.length)}${ext}`;
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}
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return sanitized;
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}
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