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import * as fs from "fs";
import * as path from "path";
import { z } from "zod";
import serverConfig from "./config";
const ROOT_PATH = path.join(serverConfig.dataDir, "assets");
export const enum ASSET_TYPES {
IMAGE_JPEG = "image/jpeg",
IMAGE_PNG = "image/png",
IMAGE_WEBP = "image/webp",
APPLICATION_PDF = "application/pdf",
TEXT_HTML = "text/html",
}
// The assets that we allow the users to upload
export const SUPPORTED_UPLOAD_ASSET_TYPES: Set<string> = new Set<string>([
ASSET_TYPES.IMAGE_JPEG,
ASSET_TYPES.IMAGE_PNG,
ASSET_TYPES.IMAGE_WEBP,
ASSET_TYPES.APPLICATION_PDF,
]);
// The assets that we support saving in the asset db
export const SUPPORTED_ASSET_TYPES = new Set([
...SUPPORTED_UPLOAD_ASSET_TYPES,
ASSET_TYPES.TEXT_HTML,
]);
function getAssetDir(userId: string, assetId: string) {
return path.join(ROOT_PATH, userId, assetId);
}
export const zAssetMetadataSchema = z.object({
contentType: z.string(),
fileName: z.string().nullish(),
});
export function newAssetId() {
return crypto.randomUUID();
}
export async function saveAsset({
userId,
assetId,
asset,
metadata,
}: {
userId: string;
assetId: string;
asset: Buffer;
metadata: z.infer<typeof zAssetMetadataSchema>;
}) {
if (!SUPPORTED_ASSET_TYPES.has(metadata.contentType)) {
throw new Error("Unsupported asset type");
}
const assetDir = getAssetDir(userId, assetId);
await fs.promises.mkdir(assetDir, { recursive: true });
await Promise.all([
fs.promises.writeFile(path.join(assetDir, "asset.bin"), asset),
fs.promises.writeFile(
path.join(assetDir, "metadata.json"),
JSON.stringify(metadata),
),
]);
}
export async function saveAssetFromFile({
userId,
assetId,
assetPath,
metadata,
}: {
userId: string;
assetId: string;
assetPath: string;
metadata: z.infer<typeof zAssetMetadataSchema>;
}) {
if (!SUPPORTED_ASSET_TYPES.has(metadata.contentType)) {
throw new Error("Unsupported asset type");
}
const assetDir = getAssetDir(userId, assetId);
await fs.promises.mkdir(assetDir, { recursive: true });
await Promise.all([
fs.promises.rename(assetPath, path.join(assetDir, "asset.bin")),
fs.promises.writeFile(
path.join(assetDir, "metadata.json"),
JSON.stringify(metadata),
),
]);
}
export async function readAsset({
userId,
assetId,
}: {
userId: string;
assetId: string;
}) {
const assetDir = getAssetDir(userId, assetId);
const [asset, metadataStr] = await Promise.all([
fs.promises.readFile(path.join(assetDir, "asset.bin")),
fs.promises.readFile(path.join(assetDir, "metadata.json"), {
encoding: "utf8",
}),
]);
const metadata = zAssetMetadataSchema.parse(JSON.parse(metadataStr));
return { asset, metadata };
}
export async function deleteAsset({
userId,
assetId,
}: {
userId: string;
assetId: string;
}) {
const assetDir = getAssetDir(userId, assetId);
await fs.promises.rm(path.join(assetDir), { recursive: true });
}
export async function deleteUserAssets({ userId }: { userId: string }) {
const userDir = path.join(ROOT_PATH, userId);
const dirExists = await fs.promises
.access(userDir)
.then(() => true)
.catch(() => false);
if (!dirExists) {
return;
}
await fs.promises.rm(userDir, { recursive: true });
}
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