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import type { MessageFile } from "$lib/types/Message";
import { z } from "zod";
export interface FileProcessorOptions<TMimeType extends string = string> {
supportedMimeTypes: TMimeType[];
maxSizeInMB: number;
}
export type ImageProcessor<TMimeType extends string = string> = (file: MessageFile) => Promise<{
file: Buffer;
mime: TMimeType;
}>;
export const createDocumentProcessorOptionsValidator = <TMimeType extends string = string>(
defaults: FileProcessorOptions<TMimeType>
) => {
return z
.object({
supportedMimeTypes: z
.array(
z.enum<string, [TMimeType, ...TMimeType[]]>([
defaults.supportedMimeTypes[0],
...defaults.supportedMimeTypes.slice(1),
])
)
.default(defaults.supportedMimeTypes),
maxSizeInMB: z.number().positive().default(defaults.maxSizeInMB),
})
.default(defaults);
};
export type DocumentProcessor<TMimeType extends string = string> = (file: MessageFile) => {
file: Buffer;
mime: TMimeType;
};
export type AsyncDocumentProcessor<TMimeType extends string = string> = (
file: MessageFile
) => Promise<{
file: Buffer;
mime: TMimeType;
}>;
export function makeDocumentProcessor<TMimeType extends string = string>(
options: FileProcessorOptions<TMimeType>
): AsyncDocumentProcessor<TMimeType> {
return async (file) => {
const { supportedMimeTypes, maxSizeInMB } = options;
const { mime, value } = file;
const buffer = Buffer.from(value, "base64");
const tooLargeInBytes = buffer.byteLength > maxSizeInMB * 1000 * 1000;
if (tooLargeInBytes) {
throw Error("Document is too large");
}
const outputMime = validateMimeType(supportedMimeTypes, mime);
return { file: buffer, mime: outputMime };
};
}
const validateMimeType = <T extends readonly string[]>(
supportedMimes: T,
mime: string
): T[number] => {
if (!supportedMimes.includes(mime)) {
const supportedMimesStr = supportedMimes.join(", ");
throw Error(`Mimetype "${mime}" not found in supported mimes: ${supportedMimesStr}`);
}
return mime;
};
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