feat(api-proxy): harden Copilot BYOK resolution and add Azure provider routing by Copilot · Pull Request #4162 · github/gh-aw-firewall

Copilot · 2026-06-01T23:13:29Z

resolveCopilotApiKey() no longer treats COPILOT_API_KEY as an upstream BYOK credential, aligning BYOK key lookup with the documented provider path (COPILOT_PROVIDER_API_KEY / COPILOT_PROVIDER_BASE_URL).
This PR also includes follow-up fixes needed to preserve offline behavior and adds Azure OpenAI BYOK routing support in the API proxy.

What changed

BYOK resolver behavior
- resolveCopilotApiKey() now reads only COPILOT_PROVIDER_API_KEY.
- If COPILOT_PROVIDER_API_KEY is unset and COPILOT_API_KEY is set, the resolver returns undefined (legacy key is not forwarded).
- Added one-time deprecation warning behavior for legacy-only usage, with matching unit test updates.
Offline + BYOK compatibility fix
- Restored expected container env setup for the copilotGithubToken path when host-side provider key is absent.
- Ensures offline mode remains enabled in AWF sandbox flows and avoids regressions caused by accidental online-mode behavior.
Azure OpenAI/Cognitive Services BYOK routing
- Added Azure target detection in the Copilot provider adapter.
- Uses api-key header auth for Azure targets (instead of Bearer).
- Injects api-version query param (default 2024-10-21, configurable).
- Extended config/schema/types and tests for copilotProviderTarget options (including basePath and azureApiVersion), plus related docs updates.
Security maintenance
- Included docs-site dependency updates to resolve high-severity audit findings.

Test updates

Updated resolver tests for provider-only key semantics and deprecation behavior.
Updated CLI/env-resolution tests for provider-only BYOK handling.
Added/updated API proxy Azure routing tests and config/schema validation coverage.

github-actions · 2026-06-01T23:24:22Z

✅ Coverage Check Passed

Overall Coverage

Metric	Base	PR	Delta
Lines	96.35%	96.41%	📈 +0.06%
Statements	96.21%	96.25%	📈 +0.04%
Functions	98.27%	98.27%	➡️ +0.00%
Branches	90.44%	90.49%	📈 +0.05%

📁 Per-file Coverage Changes (2 files)

File	Lines (Before → After)	Statements (Before → After)
`src/services/api-proxy-service.ts`	98.9% → 99.0% (+0.01%)	98.0% → 97.1% (-0.93%)
`src/config-writer.ts`	89.3% → 90.9% (+1.65%)	89.3% → 90.9% (+1.65%)

Coverage comparison generated by scripts/ci/compare-coverage.ts

Copilot

Pull request overview

This PR updates AWF’s Copilot BYOK credential resolution so that resolveCopilotApiKey() no longer treats COPILOT_API_KEY (Copilot CLI session auth / sentinel-prone) as an upstream BYOK credential, aligning BYOK key lookup to COPILOT_PROVIDER_API_KEY and adding deprecation signaling when legacy-only env is detected.

Changes:

Updated resolveCopilotApiKey() to read only COPILOT_PROVIDER_API_KEY and ignore COPILOT_API_KEY (with a one-time warning).
Added a process-local “warn once” latch plus a reset helper for tests.
Updated unit tests and CLI env-resolution tests to reflect provider-only BYOK semantics and warning behavior.

Show a summary per file

File	Description
`src/copilot-api-resolver.ts`	Switches BYOK key resolution to provider-only and adds one-time deprecation warning behavior.
`src/copilot-api-resolver.test.ts`	Updates resolver tests for new precedence/ignore rules and warning latch behavior.
`src/cli.test.ts`	Updates CLI env-resolution expectations to match provider-only BYOK key semantics.

Copilot's findings

Tip

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Files reviewed: 3/3 changed files
Comments generated: 2

+let copilotApiKeyDeprecationWarned = false;
+
+export function __resetCopilotApiKeyDeprecationLatchForTesting(): void {
+  copilotApiKeyDeprecationWarned = false;
+}


+  if (env.COPILOT_API_KEY !== undefined && !copilotApiKeyDeprecationWarned) {
+    logger.warn(
+      'COPILOT_API_KEY is deprecated for BYOK and will be ignored; use COPILOT_PROVIDER_API_KEY and COPILOT_PROVIDER_BASE_URL instead.'
+    );
+    copilotApiKeyDeprecationWarned = true;
+  }


Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-06-01T23:47:03Z

Documentation Preview

Documentation build failed for this PR. View logs.

Built from commit 06d1a98

When resolveCopilotApiKey() returns undefined (no COPILOT_PROVIDER_API_KEY on host), the copilotGithubToken path still needs COPILOT_OFFLINE=true, COPILOT_PROVIDER_BASE_URL, and COPILOT_PROVIDER_API_KEY placeholder to be set in the agent container. Without these, the Copilot CLI runs in online mode, enforcing MCP server policies and using stream_options — both of which cause failures in the AWF sandbox. The offline+BYOK block now fires when either copilotApiKey OR copilotGithubToken is present, matching the pre-existing behavior where the old resolver returned the dummy sentinel as a truthy value. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

lpcox · 2026-06-02T00:49:39Z

@copilot update the pr summary to reflect all commits and their motivations

Copilot · 2026-06-02T00:51:29Z

@copilot update the pr summary to reflect all commits and their motivations

Updated summary to reflect all commits and motivations:

633bcfd — switched Copilot BYOK key resolution to provider-only (COPILOT_PROVIDER_API_KEY), so COPILOT_API_KEY is no longer treated as an upstream BYOK credential.
1ec58a2 — fixed the copilotGithubToken path to still force offline+BYOK container env setup when no provider key is present on host, preventing online-mode regressions in AWF sandbox.
ac9a296 — added Azure OpenAI/Cognitive Services BYOK routing support in the API proxy (host detection, api-key auth header, api-version handling, and config/schema/docs updates).
2938168 — resolved high-severity docs-site audit vulnerabilities to keep docs dependencies compliant and secure.
5c3fd0f — initial planning commit used to track execution checklist for this branch.

If you want, I can also condense this into a shorter 2–3 bullet PR description format.

lpcox · 2026-06-02T01:28:03Z

@copilot address review feedback unless it undoes subsequent commits #4162 (review)

Copilot · 2026-06-02T01:33:58Z

@copilot address review feedback unless it undoes subsequent commits #4162 (review)

Addressed in 76c3539.

Removed the exported test-only latch reset helper from production API and updated tests to avoid relying on exported internals.
Updated deprecation warning behavior to skip known sentinel/placeholder and blank/whitespace COPILOT_API_KEY values, reducing expected-flow noise.
Added/updated resolver tests for warn-once behavior and sentinel/blank suppression.

github-actions · 2026-06-02T03:00:03Z

Smoke Test: Claude Engine

✅ GitHub API: 2 recent PR entries found
✅ GitHub check: playwright_check=PASS
✅ File verify: smoke-test-claude-26792817182.txt exists

Result: PASS (3/3)

💥 [THE END] — Illustrated by Smoke Claude

github-actions · 2026-06-02T03:00:53Z

🔭 Smoke Test: API Proxy OpenTelemetry Tracing

Scenario	Result	Notes
1. Module Loading	✅	`otel.js` loads; exports: `startRequestSpan`, `setTokenAttributes`, `endSpan`, `endSpanError`, `shutdown`, `isEnabled` + internals
2. Test Suite	✅	33/33 tests pass (spans, token attrs, parent ctx propagation, OTLP export, file fallback, graceful degradation)
3. Env Var Forwarding	✅	`api-proxy-service.ts` forwards `OTEL_EXPORTER_OTLP_ENDPOINT`, `OTEL_EXPORTER_OTLP_HEADERS`, `GITHUB_AW_OTEL_TRACE_ID`, `GITHUB_AW_OTEL_PARENT_SPAN_ID`, `OTEL_SERVICE_NAME`
4. Token Tracker Integration	✅	`onUsage` callback exists in `token-tracker-http.js`; invoked after usage extraction as OTEL hook point
5. OTEL Diagnostics	✅	`FileSpanExporter` writes NDJSON to `/var/log/api-proxy/otel.jsonl` when OTLP endpoint is unset; `ProxyAwareOtlpExporter` routes via Squid when configured

All scenarios pass. OTEL tracing integration is complete and working.

📡 OTel tracing validated by Smoke OTel Tracing

github-actions · 2026-06-02T03:01:02Z

🔍 Smoke Test Results

Test	Status
GitHub MCP connectivity	✅
GitHub.com HTTP connectivity	⚠️ (pre-step data unavailable)
File write/read	⚠️ (pre-step data unavailable)

Overall: PARTIAL — MCP confirmed working; pre-step outputs not injected (template vars unexpanded).

PR: feat(api-proxy): harden Copilot BYOK resolution and add Azure provider routing
Author: @Copilot | Assignees: @lpcox, @Copilot

📰 BREAKING: Report filed by Smoke Copilot

github-actions · 2026-06-02T03:01:10Z

🔥 Smoke Test: Copilot BYOK (Offline) Mode

Test	Result
GitHub MCP connectivity	✅
GitHub.com HTTP connectivity	⚠️ (template vars unresolved — pre-step data unavailable)
File write/read	⚠️ (template vars unresolved — pre-step data unavailable)
BYOK inference (agent responding)	✅

Running in BYOK offline mode (COPILOT_OFFLINE=true) via api-proxy → api.githubcopilot.com.

PR: feat(api-proxy): harden Copilot BYOK resolution and add Azure provider routing — author @Copilot, assignees @lpcox @Copilot

Overall: PARTIAL (2/2 verifiable tests pass; 2 tests had unresolved CI template variables)

🔑 BYOK report filed by Smoke Copilot BYOK

github-actions · 2026-06-02T03:01:19Z

Smoke test results:\n- fix(workflow): prevent multiline GITHUB_OUTPUT in red-team benchmark ✅\n- fix(test): correct smoke-claude version assertion to match v0.76.1 ✅\n- GitHub query ✅\n- GitHub title ✅\n- File write/read ✅\n- Discussion lookup ✅\n- Build ✅\nOverall: PASS

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "registry.npmjs.org"

See Network Configuration for more information.

🔮 The oracle has spoken through Smoke Codex

github-actions · 2026-06-02T03:02:12Z

Smoke test FAIL: GitHub MCP missing. Connectivity PASS (via proxy). File/Bash PASS.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

localhost

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "localhost"

See Network Configuration for more information.

💎 Faceted by Smoke Gemini

github-actions · 2026-06-02T03:02:20Z

Chroot Version Comparison

Runtime	Host Version	Chroot Version	Match?
Python	Python 3.12.13	Python 3.12.3	❌ NO
Node.js	v24.16.0	v22.22.3	❌ NO
Go	go1.22.12	go1.22.12	✅ YES

Result: ❌ Not all tests passed — Python and Node.js versions differ between host and chroot.

Tested by Smoke Chroot

github-actions · 2026-06-02T03:02:27Z

🏗️ Build Test Suite Results

Ecosystem	Project	Build/Install	Tests	Status
Bun	elysia	✅	1/1 passed	✅ PASS
Bun	hono	✅	1/1 passed	✅ PASS
C++	fmt	✅	N/A	✅ PASS
C++	json	✅	N/A	✅ PASS
Deno	oak	N/A	1/1 passed	✅ PASS
Deno	std	N/A	1/1 passed	✅ PASS
.NET	hello-world	✅	N/A	✅ PASS
.NET	json-parse	✅	N/A	✅ PASS
Go	color	✅	1/1 passed	✅ PASS
Go	env	✅	1/1 passed	✅ PASS
Go	uuid	✅	1/1 passed	✅ PASS
Java	gson	✅	1/1 passed	✅ PASS
Java	caffeine	✅	1/1 passed	✅ PASS
Node.js	clsx	✅	All passed	✅ PASS
Node.js	execa	✅	All passed	✅ PASS
Node.js	p-limit	✅	All passed	✅ PASS
Rust	fd	✅	1/1 passed	✅ PASS
Rust	zoxide	✅	1/1 passed	✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Generated by Build Test Suite for issue #4162 · sonnet46 887.6K · ◷

github-actions · 2026-06-02T03:03:44Z

Smoke Test Results

Redis PING: ❌ (connection timed out)
PostgreSQL pg_isready: ❌ (no response)
PostgreSQL SELECT 1: ❌ (not attempted — pg_isready failed)

Overall: FAIL — host.docker.internal is not reachable from this environment. Service containers appear unreachable.

🔌 Service connectivity validated by Smoke Services

Initial plan

5c3fd0f

Copilot AI assigned Copilot and lpcox Jun 1, 2026

Copilot started work on behalf of lpcox June 1, 2026 23:13 View session

Copilot AI linked an issue Jun 1, 2026 that may be closed by this pull request

Proposal: Stop treating COPILOT_API_KEY as a BYOK upstream credential #4161

Open

fix: use provider-only copilot BYOK key resolution

633bcfd

Copilot AI changed the title ~~[WIP] Stop treating COPILOT_API_KEY as a BYOK upstream credential~~ Stop treating COPILOT_API_KEY as a BYOK upstream credential Jun 1, 2026

Copilot finished work on behalf of lpcox June 1, 2026 23:19

Copilot AI requested a review from lpcox June 1, 2026 23:19

lpcox marked this pull request as ready for review June 1, 2026 23:22

Copilot AI review requested due to automatic review settings June 1, 2026 23:22

Copilot started reviewing on behalf of lpcox June 1, 2026 23:23 View session