Add lookup Mastodon API route

routes.ts

@@ -59,6 +59,7 @@ export const rawRoutes = {
         "./server/api/api/v1/accounts/[id]/unfollow",
     "/api/v1/accounts/[id]/unmute": "./server/api/api/v1/accounts/[id]/unmute",
     "/api/v1/accounts/[id]/unpin": "./server/api/api/v1/accounts/[id]/unpin",
+    "/api/v1/accounts/lookup": "./server/api/api/v1/accounts/lookup/index",
     "/api/v1/follow_requests/[account_id]/authorize":
         "./server/api/api/v1/follow_requests/[account_id]/authorize",
     "/api/v1/follow_requests/[account_id]/reject":

server/api/api/v1/accounts/lookup/index.ts

@@ -0,0 +1,59 @@
+import { apiRoute, applyConfig } from "@api";
+import { errorResponse, jsonResponse } from "@response";
+import { client } from "~database/datasource";
+import type { UserWithRelations } from "~database/entities/User";
+import { resolveWebFinger, userToAPI } from "~database/entities/User";
+import { userRelations } from "~database/entities/relations";
+
+export const meta = applyConfig({
+    allowedMethods: ["GET"],
+    ratelimits: {
+        max: 30,
+        duration: 60,
+    },
+    route: "/api/v1/accounts/lookup",
+    auth: {
+        required: false,
+        oauthPermissions: [],
+    },
+});
+
+export default apiRoute<{
+    acct: string;
+}>(async (req, matchedRoute, extraData) => {
+    const { acct } = extraData.parsedRequest;
+
+    if (!acct) {
+        return errorResponse("Invalid acct parameter", 400);
+    }
+
+    // Check if acct is matching format username@domain.com or @username@domain.com
+    const accountMatches = acct
+        ?.trim()
+        .match(/@?[a-zA-Z0-9_]+(@[a-zA-Z0-9_.:]+)/g);
+    if (accountMatches) {
+        // Remove leading @ if it exists
+        if (accountMatches[0].startsWith("@")) {
+            accountMatches[0] = accountMatches[0].slice(1);
+        }
+
+        const [username, domain] = accountMatches[0].split("@");
+        const foundAccount = await resolveWebFinger(username, domain).catch(
+            (e) => {
+                console.error(e);
+                return null;
+            },
+        );
+
+        if (foundAccount) {
+            return jsonResponse(userToAPI(foundAccount));
+        }
+
+        return errorResponse("Account not found", 404);
+    }
+
+    return errorResponse(
+        "Acct parameter is not of format username@domain.com or @username@domain.com",
+        400,
+    );
+});