add handle check endpoint for caddy

installer.sh

@@ -166,13 +166,13 @@ function main {
 
   From your DNS provider's control panel, create the required
   DNS record with the value of your server's public IP address.
-  
+
   + Any DNS name that can be resolved on the public internet will work.
   + Replace example.com below with any valid domain name you control.
   + A TTL of 600 seconds (10 minutes) is recommended.
-  
+
   Example DNS record:
-  
+
     NAME                TYPE   VALUE
     ----                ----   -----
     example.com         A      ${PUBLIC_IP:-Server public IP}
@@ -227,7 +227,7 @@ INSTALLER_MESSAGE
       sleep 2
     done
   fi
-  
+
   apt-get update
   apt-get install --yes ${REQUIRED_SYSTEM_PACKAGES}
 
@@ -295,7 +295,7 @@ DOCKERD_CONFIG
 {
 	email ${PDS_ADMIN_EMAIL}
 	on_demand_tls {
-		ask http://localhost:3000
+		ask http://localhost:3000/check-handle
 	}
 }
 
@@ -380,7 +380,7 @@ SYSTEMD_UNIT_FILE
 
   cat <<INSTALLER_MESSAGE
 ========================================================================
-PDS installation successful! 
+PDS installation successful!
 ------------------------------------------------------------------------
 
 Check service status      : sudo systemctl status pds
@@ -396,10 +396,10 @@ HTTP Control Panel     Inbound    443    TCP       Any
 
 Required DNS entries
 ------------------------------------------------------------------------
-Name                         Type       Value          
+Name                         Type       Value
 -------                      ---------  ---------------
-${PDS_HOSTNAME}              A          ${PUBLIC_IP}   
-*.${PDS_HOSTNAME}            A          ${PUBLIC_IP}   
+${PDS_HOSTNAME}              A          ${PUBLIC_IP}
+*.${PDS_HOSTNAME}            A          ${PUBLIC_IP}
 
 Detected public IP of this server: ${PUBLIC_IP}
 
@@ -411,7 +411,7 @@ curl --silent \\
   --user "admin:${PDS_ADMIN_PASSWORD}" \\
   --header "Content-Type: application/json" \\
   --data '{"useCount": 1}' \\
-  https://${PDS_HOSTNAME}/xrpc/com.atproto.server.createInviteCode 
+  https://${PDS_HOSTNAME}/xrpc/com.atproto.server.createInviteCode
 
 ========================================================================
 INSTALLER_MESSAGE

service/index.js

@@ -15,8 +15,7 @@ const main = async () => {
   const secrets = envToSecrets(env);
   const pds = await PDS.create(cfg, secrets);
   await pds.start();
-  httpLogger.info("pds is running");
-
+  pds.app.get("/check-handle", checkHandleRoute);
   // Graceful shutdown (see also https://aws.amazon.com/blogs/containers/graceful-shutdowns-with-ecs/)
   process.on("SIGTERM", async () => {
     httpLogger.info("pds is stopping");
@@ -25,4 +24,42 @@ const main = async () => {
   });
 };
 
+async function checkHandleRoute(
+  /** @type {import('express').Request} */ req,
+  /** @type {import('express').Response} */ res,
+  /** @type {import('express').NextFunction} */ next
+) {
+  try {
+    const { domain } = req.query;
+    if (!domain || typeof domain !== "string") {
+      return res.status(400).json({
+        error: "InvalidRequest",
+        message: "bad or missing domain query param",
+      });
+    }
+    const isHostedHandle = pds.ctx.cfg.availableUserDomains.find((avail) =>
+      domain.endsWith(avail)
+    );
+    if (!isHostedHandle) {
+      return res.status(400).json({
+        error: "InvalidRequest",
+        message: "handles are not provided on this domain",
+      });
+    }
+    const account = await pds.ctx.accountManager.getAccount(domain);
+    if (!account) {
+      return res.status(404).json({
+        error: "NotFound",
+        message: "handle not found for this domain",
+      });
+    }
+    return res.json({ did: account.did, handle: account.handle });
+  } catch {
+    return res.status(500).json({
+      error: "InternalServerError",
+      message: "Internal Server Error",
+    });
+  }
+}
+
 main();