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import { error } from "@sveltejs/kit";
import { collections } from "$lib/server/database";
import type { Conversation } from "$lib/types/Conversation";
import type { SharedConversation } from "$lib/types/SharedConversation";
import type { MessageFile } from "$lib/types/Message";
export async function downloadFile(
sha256: string,
convId: Conversation["_id"] | SharedConversation["_id"]
): Promise<MessageFile & { type: "base64" }> {
const fileId = collections.bucket.find({ filename: `${convId.toString()}-${sha256}` });
const file = await fileId.next();
if (!file) {
error(404, "File not found");
}
if (file.metadata?.conversation !== convId.toString()) {
error(403, "You don't have access to this file.");
}
const mime = file.metadata?.mime;
const name = file.filename;
const fileStream = collections.bucket.openDownloadStream(file._id);
const buffer = await new Promise<Buffer>((resolve, reject) => {
const chunks: Uint8Array[] = [];
fileStream.on("data", (chunk) => chunks.push(chunk));
fileStream.on("error", reject);
fileStream.on("end", () => resolve(Buffer.concat(chunks)));
});
return { type: "base64", name, value: buffer.toString("base64"), mime };
}
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