1 files changed, 44 insertions, 0 deletions
diff --git a/src/api/middlewares/ErrorHandler.ts b/src/api/middlewares/ErrorHandler.ts
new file mode 100644
index 00000000..2012b91c
--- /dev/null
+++ b/src/api/middlewares/ErrorHandler.ts
@@ -0,0 +1,44 @@
+import { NextFunction, Request, Response } from "express";
+import { HTTPError } from "lambert-server";
+import { ApiError, FieldError } from "@fosscord/util";
+const EntityNotFoundErrorRegex = /"(\w+)"/;
+
+export function ErrorHandler(error: Error, req: Request, res: Response, next: NextFunction) {
+	if (!error) return next();
+
+	try {
+		let code = 400;
+		let httpcode = code;
+		let message = error?.toString();
+		let errors = undefined;
+
+		if (error instanceof HTTPError && error.code) code = httpcode = error.code;
+		else if (error instanceof ApiError) {
+			code = error.code;
+			message = error.message;
+			httpcode = error.httpStatus;
+		} else if (error.name === "EntityNotFoundError") {
+			message = `${error.message.match(EntityNotFoundErrorRegex)?.[1] || "Item"} could not be found`;
+			code = httpcode = 404;
+		} else if (error instanceof FieldError) {
+			code = Number(error.code);
+			message = error.message;
+			errors = error.errors;
+		} else {
+			console.error(`[Error] ${code} ${req.url}\n`, errors || error, "\nbody:", req.body);
+
+			if (req.server?.options?.production) {
+				// don't expose internal errors to the user, instead human errors should be thrown as HTTPError
+				message = "Internal Server Error";
+			}
+			code = httpcode = 500;
+		}
+
+		if (httpcode > 511) httpcode = 400;
+
+		res.status(httpcode).json({ code: code, message, errors });
+	} catch (error) {
+		console.error(`[Internal Server Error] 500`, error);
+		return res.status(500).json({ code: 500, message: "Internal Server Error" });
+	}
+}