Create get-own item by id endpoint

functions/api/me/items/[type]/[id].ts

@@ -0,0 +1,70 @@
+import { jsonError, jsonResponse } from "../../../../common.js";
+
+export async function onRequestGet(context: RequestContext) {
+  const { id, type } = context.params;
+
+  if (!["appeal", "inactivity", "report"].includes(type as string))
+    return jsonError("Invalid type", 400);
+
+  const data = (await context.env.DATA.get(`${type}_${id}`, {
+    type: "json",
+  })) as {
+    created_at: number;
+    id: string;
+    open: boolean;
+    user?: { id: string; username: string };
+  } & { [k: string]: any };
+
+  if (type === "report") {
+    let resolvedUrls = [];
+    let signingPromises = [];
+    const key = await crypto.subtle.importKey(
+      "raw",
+      Uint8Array.from(atob(context.env.URL_SIGNING_KEY), (c) =>
+        c.charCodeAt(0),
+      ),
+      { hash: "SHA=256", name: "HMAC" },
+      false,
+      ["sign"],
+    );
+
+    const exp = Math.round(Date.now() / 1000) + 1800;
+
+    for (const attachment of data.attachments) {
+      const unsignedUrl = `https://mediaproxy.carcrushers.cc/${attachment}?Expires=${exp}&KeyName=portal-media-linkgen`;
+      signingPromises.push(
+        crypto.subtle.sign("HMAC", key, new TextEncoder().encode(unsignedUrl)),
+      );
+    }
+
+    let signatures: ArrayBuffer[];
+
+    try {
+      signatures = await Promise.all(signingPromises);
+    } catch (e) {
+      console.log(e);
+
+      return jsonError("Failed to create signed links", 500);
+    }
+
+    for (let i = 0; i < signatures.length; i++) {
+      resolvedUrls.push(
+        `https://mediaproxy.carcrushers.cc/${
+          data.attachments[i]
+        }?Expires=${exp}&KeyName=portal-media-linkgen&Signature=${btoa(
+          String.fromCharCode(...new Uint8Array(signatures[i]))
+            .replaceAll("+", "-")
+            .replaceAll("/", "_")
+            .replaceAll("=", ""),
+        )}`,
+      );
+    }
+
+    data.resolved_attachments = resolvedUrls;
+  }
+
+  if (!data?.user?.id !== context.data.current_user.id)
+    return jsonError("Item does not exist", 404);
+
+  return jsonResponse(JSON.stringify(data));
+}