zod-server-actions/dist/utils/mime-type.js

Simple utility library to create server actions in Next.js

import { lookup } from "mime-types";
export const getValidMimeType = (file, acceptedTypes) => {
    if (!file) {
        throw new Error("No file provided.");
    }
    if (!acceptedTypes || acceptedTypes.length === 0) {
        throw new Error("No list of accepted file types provided.");
    }
    const detectedMimeType = lookup(file.name);
    if (!detectedMimeType) {
        throw new Error(`Unable to determine the MIME type of the file "${file.name}".`);
    }
    const normalizedAcceptedTypes = acceptedTypes.map((type) => type.toLowerCase());
    const isMimeTypeValid = normalizedAcceptedTypes.includes(detectedMimeType);
    const isExtensionValid = normalizedAcceptedTypes.some((type) => file.name.toLowerCase().endsWith(type));
    if (!isMimeTypeValid && !isExtensionValid) {
        throw new Error(`The file type "${detectedMimeType}" is not accepted. Allowed types: ${acceptedTypes.join(", ")}.`);
    }
    return detectedMimeType;
};