caca

apps/api/src/lib/http.ts

@@ -0,0 +1,77 @@
+import { config } from "./config";
+import { HttpError, isHttpError } from "./errors";
+import { buildResponseHeaders } from "./security";
+
+export const jsonResponse = (request: Request, status: number, payload: unknown, init?: HeadersInit): Response =>
+  new Response(JSON.stringify(payload), {
+    status,
+    headers: buildResponseHeaders(request, {
+      "Content-Type": "application/json; charset=utf-8",
+      ...init
+    })
+  });
+
+export const emptyResponse = (request: Request, status = 204, init?: HeadersInit): Response =>
+  new Response(null, {
+    status,
+    headers: buildResponseHeaders(request, init)
+  });
+
+export const fileResponse = (request: Request, body: Blob | Uint8Array, contentType: string, init?: HeadersInit): Response =>
+  new Response(body as BodyInit, {
+    status: 200,
+    headers: buildResponseHeaders(request, {
+      "Content-Type": contentType,
+      "Cache-Control": "private, max-age=300",
+      ...init
+    })
+  });
+
+export const parseJson = async <T>(request: Request, schema: { parse(data: unknown): T }): Promise<T> => {
+  const contentType = request.headers.get("content-type") ?? "";
+  if (!contentType.toLowerCase().includes("application/json")) {
+    throw new HttpError(415, "Expected application/json request body.");
+  }
+
+  let payload: unknown;
+  try {
+    payload = await request.json();
+  } catch {
+    throw new HttpError(400, "Malformed JSON request body.");
+  }
+
+  try {
+    return schema.parse(payload);
+  } catch (error) {
+    throw new HttpError(400, "Request validation failed.", { details: error });
+  }
+};
+
+export const errorResponse = (request: Request, error: unknown): Response => {
+  if (isHttpError(error)) {
+    const retryAfterMs =
+      typeof error.details === "object" &&
+      error.details !== null &&
+      "retryAfterMs" in error.details &&
+      typeof (error.details as { retryAfterMs?: unknown }).retryAfterMs === "number"
+        ? Math.ceil(((error.details as { retryAfterMs: number }).retryAfterMs ?? 0) / 1000)
+        : undefined;
+
+    return jsonResponse(
+      request,
+      error.status,
+      {
+        error: error.expose ? error.message : "An internal server error occurred."
+      },
+      retryAfterMs ? { "Retry-After": String(retryAfterMs) } : undefined
+    );
+  }
+
+  if (config.nodeEnv !== "production") {
+    console.error(error);
+  }
+
+  return jsonResponse(request, 500, {
+    error: "An internal server error occurred."
+  });
+};