express-image-validator/dist/validators/validateMimeType.js

Validator of various image parameters in Express.js applications

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.validateMimeType = void 0;
const file_type_1 = __importDefault(require("file-type"));
const isSvg_1 = require("../utils/isSvg");
const mimeType_1 = require("./errors/mimeType");
/**
 * Validates that the uploaded file has an allowed MIME type and that the file's buffer
 * matches the declared MIME type. Special handling is included for SVG files.
 * @type { FileValidatorFunction }
 * @param { string } field Field name.
 * @param { UploadedFile } file The uploaded file to validate.
 * @param { ValidationOptions } options Validation options containing `allowedMimeTypes`.
 * @returns { Promise<ValidationResult> } Validation result as `Promise`.
 */
const validateMimeType = async (field, file, { allowedMimeTypes }) => {
    const allowedTypes = allowedMimeTypes;
    const svgAllowed = allowedTypes.includes('image/svg+xml');
    const errors = [];
    if (!allowedTypes.includes(file?.mimetype)) {
        errors.push((0, mimeType_1.notSupportedError)(field, allowedTypes, file?.mimetype, file?.name));
        return { errors };
    }
    if (svgAllowed && (0, isSvg_1.isSvg)(String(file.data))) {
        return { errors };
    }
    const realBufferType = await file_type_1.default.fromBuffer(file.data);
    if (!realBufferType || realBufferType.mime !== file.mimetype) {
        errors.push((0, mimeType_1.notRealBufferError)(field, file.mimetype, realBufferType?.mime, file.name));
    }
    return { errors };
};
exports.validateMimeType = validateMimeType;