[pitboss] phase 12: Track B — Python harness emitter shapes

tests/dynamic_fixtures/python/fastapi/benign.py

@@ -0,0 +1,23 @@
+"""Phase 12 — FastAPI route, benign."""
+import re
+import subprocess
+
+from fastapi import FastAPI
+
+app = FastAPI()
+
+_VALID_HOST = re.compile(r"^[A-Za-z0-9.-]{1,253}$")
+
+
+@app.get("/ping")
+def ping(host: str = ""):
+    if not _VALID_HOST.fullmatch(host):
+        return "invalid host"
+    result = subprocess.run(
+        ["ping", "-c", "1", host],
+        shell=False,
+        capture_output=True,
+        text=True,
+        timeout=5,
+    )
+    return result.stdout + result.stderr