From 7a0a26d6fd5ef145090631df3a0379d66ab75174 Mon Sep 17 00:00:00 2001
From: Konstantin Wohlwend <n2d4xc@gmail.com>
Date: Tue, 29 Jul 2025 13:52:44 -0700
Subject: [PATCH] Freestyle mock

---
 apps/dev-launchpad/public/index.html          |  3 +
 docker/dependencies/docker.compose.yaml       | 17 ++++
 docker/dependencies/freestyle-mock/Dockerfile | 90 +++++++++++++++++++
 3 files changed, 110 insertions(+)
 create mode 100644 docker/dependencies/freestyle-mock/Dockerfile

diff --git a/apps/dev-launchpad/public/index.html b/apps/dev-launchpad/public/index.html
index c5f533f1a..b169d676b 100644
--- a/apps/dev-launchpad/public/index.html
+++ b/apps/dev-launchpad/public/index.html
@@ -110,6 +110,9 @@
       <li>
         4318: OTel collector
       </li>
+      <li>
+        8119: Freestyle mock
+      </li>
     </ul>
     <noscript>
       This page requires JavaScript.
diff --git a/docker/dependencies/docker.compose.yaml b/docker/dependencies/docker.compose.yaml
index 74213efe4..b17597546 100644
--- a/docker/dependencies/docker.compose.yaml
+++ b/docker/dependencies/docker.compose.yaml
@@ -134,6 +134,22 @@ services:
     - svix-redis
     - svix-db
 
+  # ================= Freestyle mock =================
+
+  freestyle-mock:
+    build:
+      context: ./freestyle-mock
+      dockerfile: Dockerfile
+    image: freestyle-mock
+    container_name: freestyle-mock
+    ports:
+      - "8119:8080"       # POST http://localhost:8119/execute/v1/script
+    environment:
+      DENO_DIR: /deno-cache
+    volumes:
+      - deno-cache:/deno-cache
+
+
 # ================= volumes =================
 
 volumes:
@@ -141,6 +157,7 @@ volumes:
   inbucket-data:
   svix-redis-data:
   svix-postgres-data:
+  deno-cache:
 
 # ================= configs =================
 
diff --git a/docker/dependencies/freestyle-mock/Dockerfile b/docker/dependencies/freestyle-mock/Dockerfile
new file mode 100644
index 000000000..1b336a082
--- /dev/null
+++ b/docker/dependencies/freestyle-mock/Dockerfile
@@ -0,0 +1,90 @@
+FROM denoland/deno:1.46.1
+
+# ---- app setup --------------------------------------------------------------
+WORKDIR /app
+
+# Drop the whole server inline
+RUN cat <<'EOF' > server.ts
+import { serve } from "https://deno.land/std@0.224.0/http/server.ts";
+import { ensureDir } from "https://deno.land/std@0.224.0/fs/ensure_dir.ts";
+import { join } from "https://deno.land/std@0.224.0/path/mod.ts";
+
+type LogLine = { message: string; type: string };
+
+serve(async (req) => {
+  const url = new URL(req.url);
+  if (!(req.method === "POST" && url.pathname === "/execute/v1/script")) {
+    return new Response("Not found", { status: 404 });
+  }
+
+  const { script, config = {} } = await req.json();
+
+  // 1. temp dir --------------------------------------------------------------
+  const workDir = join("/tmp", "job-" + crypto.randomUUID());
+  await ensureDir(workDir);
+
+  // 2. write user script -----------------------------------------------------
+  const scriptFile = join(workDir, "user_script.ts");
+  await Deno.writeTextFile(scriptFile, script);
+
+  // 3. (optional) pre-cache npm deps ----------------------------------------
+  if (config.nodeModules && Object.keys(config.nodeModules).length) {
+    const pkgs = Object.entries<string>(config.nodeModules).map(
+      ([name, ver]) => `npm:${name}@${ver}`,
+    );
+    await new Deno.Command("deno", {
+      cwd: workDir,
+      args: ["cache", "--unstable", "--node-modules-dir", ...pkgs],
+    }).output();
+  }
+
+  // 4. run user script & capture logs ---------------------------------------
+  const logs: LogLine[] = [];
+  const proxied = new Proxy(console, {
+    get(t, p) {
+      if (typeof p === "string" && typeof t[p as keyof Console] === "function") {
+        return (...args: unknown[]) => {
+          logs.push({ message: args.map(String).join(" "), type: p });
+          // @ts-ignore - let it still log to container stdout
+          t[p](...args);
+        };
+      }
+      // @ts-ignore
+      return t[p];
+    },
+  });
+
+  let result: unknown = null;
+  try {
+    const original = globalThis.console;
+    // @ts-ignore
+    globalThis.console = proxied;
+
+    for (const [k, v] of Object.entries(config.envVars ?? {})) Deno.env.set(k, v);
+
+    const mod = await import(`file://${scriptFile}?t=${Date.now()}`);
+    if (typeof mod.default !== "function") throw new Error("default export missing");
+    result = await mod.default();
+
+    // @ts-ignore
+    globalThis.console = original;
+  } catch (err) {
+    return new Response(JSON.stringify({ error: err.message, logs }), {
+      status: 500,
+      headers: { "Content-Type": "application/json" },
+    });
+  } finally {
+    try { await Deno.remove(workDir, { recursive: true }); } catch { /* ignore */ }
+  }
+
+  return new Response(JSON.stringify({ result, logs }), {
+    headers: { "Content-Type": "application/json" },
+  });
+}, { port: 8080 });
+EOF
+
+# ---- network ----------------------------------------------------------------
+EXPOSE 8080
+
+# ---- launch -----------------------------------------------------------------
+CMD ["deno", "run", "--unstable", "-A", "server.ts"]