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import json
import os
import time
from mitmproxy import http
class CaptureAddon:
def __init__(self):
self.output_dir = os.environ.get("CAPTURE_DIR", "/captures")
os.makedirs(self.output_dir, exist_ok=True)
self.counter = 0
def request(self, flow: http.HTTPFlow):
if "api.anthropic.com" not in (flow.request.host or ""):
return
self.counter += 1
flow.metadata["capture_id"] = self.counter
body = None
try:
body = json.loads(flow.request.get_text())
except Exception:
body = flow.request.get_text()
source = "unknown"
ua = flow.request.headers.get("user-agent", "")
if "claude-cli" in ua or "claude-code" in ua:
source = "claude-code"
elif "python" in ua.lower() or "httpx" in ua.lower():
source = "claude-py"
data = {
"capture_id": self.counter,
"source": source,
"timestamp": time.time(),
"method": flow.request.method,
"url": flow.request.pretty_url,
"headers": dict(flow.request.headers),
"body": body,
}
path = os.path.join(self.output_dir, f"req_{self.counter:04d}.json")
with open(path, "w") as f:
json.dump(data, f, indent=2, default=str)
print(f"[capture] #{self.counter} {source} {flow.request.method} {flow.request.pretty_url}")
addons = [CaptureAddon()]
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