## Description
Adds Prometheus metrics to the AI Bridge Proxy for observability into
proxy traffic and performance.
## Changes
* Add Metrics struct with the following metrics:
* `connect_sessions_total`: counts CONNECT sessions by type
(mitm/tunneled)
* `mitm_requests_total`: counts MITM requests by provider
* `inflight_mitm_requests`: gauge tracking in-flight requests by
provider
* `mitm_request_duration_seconds`: histogram of request latencies by
provider
* `mitm_responses_total`: counts responses by status code class
(2XX/3XX/4XX/5XX) and provider
* Register metrics with `coder_aibridgeproxyd_` prefix in CLI
* Unregister metrics on server close to prevent registry leaks
* Add `tunneledMiddleware` to track non-allowlisted CONNECT sessions
* Add tests for metric recording in both MITM and tunneled paths
Closes: https://github.com/coder/internal/issues/1185
## Description
Adds upstream proxy support for AI Bridge Proxy passthrough requests.
This allows aiproxy to forward non-allowlisted requests through an
upstream proxy. Currently, the only supported configuration is when
aiproxy is the first proxy in the chain (client → aiproxy → upstream
proxy).
## Changes
* Add `--aibridge-proxy-upstream` option to configure an upstream
HTTP/HTTPS proxy URL for passthrough requests
* Add `--aibridge-proxy-upstream-ca` option to trust custom CA
certificates for HTTPS upstream proxies
* Passthrough requests (non-allowlisted domains) are forwarded through
the upstream proxy
* MITM'd requests (allowlisted domains) continue to go directly to
aibridge, not through the upstream proxy
* Add tests for upstream proxy configuration and request routing
Closes: https://github.com/coder/internal/issues/1204
## Description
Implements selective MITM (Man-in-the-Middle) in `aibridgeproxyd` so
that only requests to allowlisted domains are intercepted and decrypted.
Requests to all other domains are tunneled directly without decryption.
## Changes
* New config option: `CODER_AIBRIDGE_PROXY_DOMAIN_ALLOWLIST` (default:
`api.anthropic.com`,`api.openai.com`)
* Selective MITM: Uses `goproxy.ReqHostIs()` to only intercept `CONNECT`
requests to allowlisted hosts
* Certificate caching: Now only generates/caches certificates for
allowlisted domains
* Validation: Startup fails if domain allowlist is empty or contains
invalid entries
Closes: https://github.com/coder/internal/issues/1182
## Description
Implements request routing for the AI Bridge Proxy. After MITM decryption, requests to known AI providers (Anthropic, OpenAI) are rewritten to the corresponding aibridged endpoint, while requests to unknown hosts are passed through to their original destination.
## Changes
* Add `CoderAccessURL` configuration option for specifying the Coder deployment URL
* Add `handleRequest` to route decrypted requests based on target host
* Route known AI providers (Anthropic and OpenAI) to AI Bridge specific endpoint.
* Passthrough requests to unknown hosts directly to their original destination
* Inject Coder session token (from https://github.com/coder/coder/pull/21342) as `Authorization: Bearer` header for aibridged
* Add tests for routing and passthrough behavior
Depends on: https://github.com/coder/coder/pull/21342
Closes: https://github.com/coder/internal/issues/1181
## Description
Adds the core AI Bridge MITM proxy daemon. This proxy intercepts HTTPS traffic, decrypts it using a configured CA certificate, and forwards requests to AIBridge for processing.
## Changes
* Added `aibridgeproxyd` package with the core proxy server implementation
* Added configuration options: `CODER_AIBRIDGE_PROXY_ENABLED`, `CODER_AIBRIDGE_PROXY_LISTEN_ADDR`, `CODER_AIBRIDGE_PROXY_CERT_FILE`, `CODER_AIBRIDGE_PROXY_KEY_FILE`
* Added tests for server initialization and MITM functionality
Closes https://github.com/coder/internal/issues/1180
Susana Ferreira