Deduplicate provider auth header construction across runtime, validation, and model fetch paths

[Copilot]

Provider adapters were rebuilding security-sensitive auth headers in separate code paths (request forwarding, startup validation, and model fetch), creating drift risk between OIDC and static-key behavior. This change centralizes header construction per provider and reuses the same factories across those paths.

• Anthropic: unify OIDC/static auth header building

  • Added shared local builders for:
    • OIDC bearer headers
    • static-key headers
    • fallback resolution used by validation + model fetch
  • Rewired runtime getAuthHeaders to reuse the same builders instead of rebuilding inline.
  • Preserved provider-specific additions (anthropic-version, content-type, anthropic-beta behavior) unchanged.

• OpenAI: collapse duplicated token/static header factories

  • Introduced a single token header factory (buildTokenAuthHeaders) used for both static-key and OIDC token shapes.
  • Reused a single static header factory for validationHeaders, modelsFetchHeaders, and runtime fallback.
  • Kept custom header behavior (AWF_OPENAI_AUTH_HEADER) and ****** intact.

• Gemini: single header factory for all paths

  • Extracted buildAuthHeaders() and reused it in runtime auth, validation headers, and model fetch headers.
  • Eliminated repeated x-goog-api-key literals without changing behavior.

Example of the new shared-pattern direction:

const buildAuthHeaders = () => ({ 'x-goog-api-key': apiKey });

validationHeaders: buildAuthHeaders,
modelsFetchHeaders: buildAuthHeaders,
getAuthHeaders() {
  return buildAuthHeaders();
}

[Copilot]

Pull request overview

This PR reduces drift risk in security-sensitive provider authentication by centralizing and reusing auth header construction across runtime forwarding, startup validation, and model-fetch paths for the API proxy providers.

Changes:

• OpenAI: Introduces a shared token/static header builder and reuses it for validation, models fetch, and runtime fallback selection (including AWF_OPENAI_AUTH_HEADER behavior).
• Gemini: Extracts a single buildAuthHeaders() factory and reuses it across validation, models fetch, and runtime auth headers.
• Anthropic: Factors OIDC/static header builders and a shared “resolve with fallback” helper to keep validation/model fetch aligned with runtime behavior.

Show a summary per file

File	Description
containers/api-proxy/providers/openai.js	Deduplicates token/static auth header construction and reuses the same factories across validation, model fetch, and runtime auth.
containers/api-proxy/providers/gemini.js	Extracts a single Gemini header factory and reuses it across all adapter paths.
containers/api-proxy/providers/anthropic.js	Centralizes OIDC/static header building and shared fallback resolution for validation/models while preserving request-time Anthropic header additions.

Review details

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Low

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✅ Copilot review passed with no inline comments.

@copilot Add the ready-for-aw label to this PR to trigger agentic CI smoke tests.

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✅ Smoke Copilot BYOK AOAI (api-key) completed. Copilot AOAI BYOK (api-key) mode operational. 🔓

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✅ Smoke Gemini completed. All facets verified. 💎

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✨ The prophecy is fulfilled... Smoke Codex has completed its mystical journey. The stars align. 🌟

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📡 Smoke OTel Tracing completed. All tracing scenarios validated. ✅

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🔌 Smoke Services — All services reachable! ✅

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Chroot tests failed Smoke Chroot failed - See logs for details.

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📰 VERDICT: Smoke Copilot has concluded. All systems operational. This is a developing story. 🎤

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❌ Security Guard failed. Please review the logs for details.

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✅ Build Test Suite completed successfully!

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🔑 Smoke Copilot PAT PAT auth validated. All systems operational. ✅

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✅ Smoke Copilot BYOK AOAI (Entra) completed. Copilot AOAI BYOK (Entra) mode operational. 🔓

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✅ Smoke Claude passed

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✅ Smoke Copilot BYOK completed. Copilot BYOK mode operational. 🔓

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✅ Contribution Check completed successfully!

PR #5836 appears to follow the applicable contribution guidelines based on the prefetched metadata, diff, and CONTRIBUTING.md. The changes are a refactor with clear description, appropriate file placement under containers/, and no new user-facing functionality requiring documentation or tests.

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✅ Coverage Check Passed

Overall Coverage

Metric	Base	PR	Delta
Lines	98.62%	98.66%	📈 +0.04%
Statements	98.51%	98.55%	📈 +0.04%
Functions	99.56%	99.56%	➡️ +0.00%
Branches	94.42%	94.42%	➡️ +0.00%

📁 Per-file Coverage Changes (1 files)

File	Lines (Before → After)	Statements (Before → After)
src/workdir-setup.ts	93.0% → 94.8% (+1.74%)	93.0% → 94.8% (+1.74%)

---

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

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Smoke Test: Copilot BYOK (Direct) Mode - PASS

✅ GitHub.com connectivity (HTTP 200)
✅ File I/O operations
✅ Direct BYOK inference active via api-proxy → api.githubcopilot.com

Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY)

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Smoke Test: Claude Engine Validation

Check	Result
API Status	✅ PASS
GH Check	✅ PASS
File Status	✅ PASS

Overall Result: PASS ✅

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Firewall blocked 1 domain

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Smoke Test Results

Test	Status
GitHub MCP Connectivity	✅
GitHub.com HTTP	✅ (200)
File Write/Read	⚠️ (template vars unresolved in workflow)

Overall: PASS

PR author: @lpcox

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Smoke Test Results

Test	Status
GitHub MCP connectivity	✅
GitHub.com HTTP	✅
File write/read	✅

Overall: PASS | Auth mode: PAT (COPILOT_GITHUB_TOKEN)

cc @lpcox

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Firewall blocked 1 domain

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Smoke Test: Copilot BYOK (Direct) Mode — Azure OpenAI (Foundry, api-key)

✅ MCP connectivity
✅ GitHub.com connectivity
✅ File I/O
✅ BYOK inference

Overall: PASS
Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw)

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Smoke Test Results

• Redis PING: ❌ Network is unreachable
• PostgreSQL pg_isready: ❌ No response
• PostgreSQL SELECT 1: ❌ Network is unreachable

Overall: FAIL — host.docker.internal (172.17.0.1) is unreachable from this runner. Service containers are not accessible.

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Smoke Test Results (Gemini)

• GitHub MCP Testing: ❌ (Unable to list PRs)
• GitHub.com Connectivity: ❌ (Status 000)
• File Writing Testing: ✅
• Bash Tool Testing: ✅

Overall Status: FAIL

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Smoke Test: API Proxy OpenTelemetry Tracing

Scenario	Result	Details
Module Loading	✅	otel.js loads successfully; exports 13 functions including startRequestSpan, setTokenAttributes, setBudgetAttributes, endSpan, endSpanError, shutdown, isEnabled
Test Suite	✅	59 tests passed, 0 failed across 2 suites (otel.test.js, otel-fanout.test.js)
Env Var Forwarding	✅	src/services/api-proxy-env-config.ts forwards GH_AW_OTLP_ENDPOINTS, OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_HEADERS, GITHUB_AW_OTEL_TRACE_ID, GITHUB_AW_OTEL_PARENT_SPAN_ID, OTEL_SERVICE_NAME
Token Tracker Integration	✅	onUsage callback exists in token-tracker-http.js (lines 283, 324) as the OTEL hook point
OTEL Diagnostics	✅	No live spans exported (no OTLP endpoint configured); graceful degradation confirmed via FileSpanExporter fallback

Overall: All scenarios pass. ✅

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🏗️ 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	✅	passed	✅ PASS
Go	env	✅	passed	✅ PASS
Go	uuid	✅	passed	✅ PASS
Java	gson	✅	1/1 passed	✅ PASS
Java	caffeine	✅	1/1 passed	✅ PASS
Node.js	clsx	✅	passed	✅ PASS
Node.js	execa	✅	passed	✅ PASS
Node.js	p-limit	✅	passed	✅ PASS
Rust	fd	✅	1/1 passed	✅ PASS
Rust	zoxide	✅	1/1 passed	✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Note (Java): Maven's default ~/.m2/repository was owned by root (no runner write access). Used -Dmaven.repo.local=/tmp/gh-aw/agent/m2repo to override. All tests passed once the writable location was set.

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Generated by Build Test Suite for #5836 · 33.8 AIC · ⊞ 6.9K · ◷
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[github-actions]

@lpcox

✅ MCP connectivity
✅ GitHub.com connectivity
✅ File write/read test
✅ BYOK inference test

Running in direct BYOK mode (AWF_AUTH_TYPE=github-oidc + AWF_AUTH_AZURE_* + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw) authenticated via Microsoft Entra

Overall: PASS

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[github-actions]

refactor(api-proxy): dedupe provider auth headers ✅
chore: upgrade gh-aw to v0.82.2 pre-release and recompile workflows ✅
fix: chmod squid logs inside container before compose down ✅
Overall: PASS

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