feat: #8 Add contact Function App with host profiles - #15
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Azure Functions POST /contact and GET /health on Consumption in rg-ssd-global. CONTACT_EMAIL_PROFILES_BY_HOST is a Function app setting so allowlisted Origins pick the right sender and inbox.
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📝 WalkthroughWalkthroughAdds an Azure Functions API with contact and health endpoints, origin allowlisting, rate limiting, App Configuration and Key Vault loading, Bicep infrastructure, and an Azure OIDC ZIP deployment workflow. It also adds runtime tests, configuration seeds, and deployment documentation. ChangesAPI Functionality
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The anonymous contact endpoint can be abused to route messages through another host profile, while the configured rate limit can be bypassed across workers or by varying forwarded ports; deployments may also fail when Key Vault permissions have not propagated. These issues should be fixed before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 9
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Inline comments:
In @.github/workflows/deploy-api.yml:
- Around line 30-32: Split build_and_deploy into separate build and deployment
jobs: run checkout, dependency installation, tests, build, and ZIP staging in a
job with contents: read only, then pass only the completed ZIP via an artifact
to a deployment job. Grant id-token: write exclusively to the deployment job,
which should download the artifact and run the Azure authentication and
deployment commands.
- Line 103: Update the dependency installation command in the deployment step to
use the pnpm deploy flow for `@singleton-sd/post-kit-api` with production
dependencies targeting "$STAGE", replacing the npm install command so the pnpm
lockfile controls resolved ZIP dependencies.
In `@apps/api/package.json`:
- Around line 9-22: Update the package test script to quote the src/**/*.spec.ts
test glob, and change its Node.js requirement to >=22 so the command uses
supported positional test-runner glob behavior. Modify the test script and
engines.node declaration while preserving the existing build steps.
In `@apps/api/src/contact-rate-limit.ts`:
- Around line 45-49: Replace the process-local contactRateLimiter with a shared,
atomic rate-limit store or edge rate limiter so CONTACT_RATE_LIMIT_PER_MIN is
enforced consistently across cold starts and scaled Function instances. Preserve
the existing positive-integer configuration and window settings, and update the
endpoint’s limiter integration to use the shared implementation.
- Around line 8-26: Update SlidingWindowRateLimiter.tryConsume and its hits
storage to evict buckets whose timestamps have all expired, including keys that
receive no further requests; perform bounded/global cleanup during limiter
operation so inactive unique keys cannot accumulate for the worker lifetime
while preserving rate-limit behavior.
In `@apps/api/src/contact.ts`:
- Around line 36-38: Update the request-origin handling in the visible try block
so an untrusted Origin header cannot authenticate or select a tenant through
trustedRequestHost. Require and validate a server-verifiable tenant signal
before returning any hostname for sender or inbox profile selection, while
preserving the allowlist check only as an additional constraint.
In `@docs/architecture/overview.md`:
- Line 33: Align the deployment-state wording in the architecture overview by
updating either the API status entry for ssd-postkit-api-prod-ae or the
Deployment (planned) section so both present the same deployment state.
In `@docs/pr-pipelines.md`:
- Line 9: Update the deploy-api.yml entry in the deployment triggers table to
include both .github/workflows/deploy-api.yml and workflow_dispatch as triggers,
documenting that workflow-only changes and manual dispatches can initiate
production deployment.
In `@infra/function-app.bicep`:
- Around line 84-114: Update the function app configuration to use Node.js 22 by
changing linuxFxVersion and WEBSITE_NODE_DEFAULT_VERSION, and update the
corresponding Node 24 reference in the infrastructure README to Node 22.
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📒 Files selected for processing (23)
.github/workflows/deploy-api.ymlapps/README.mdapps/api/.gitignoreapps/api/README.mdapps/api/host.jsonapps/api/local.settings.json.exampleapps/api/package.jsonapps/api/src/contact-rate-limit.tsapps/api/src/contact.spec.tsapps/api/src/contact.tsapps/api/src/functions/contact.tsapps/api/src/functions/health.tsapps/api/src/host-profiles.spec.tsapps/api/src/index.tsapps/api/src/origins.spec.tsapps/api/src/origins.tsapps/api/tsconfig.jsondocs/README.mddocs/architecture/overview.mddocs/email-forward-email.mddocs/pr-pipelines.mdinfra/README.mdinfra/function-app.bicep
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Split OIDC deploy from ZIP build, pin ZIP deps with pnpm deploy, use Node 22 on Y1 Linux Consumption, and evict stale rate-limit keys.
Add a Free store in rg-ssd-global. Seed missing keys only. Keep the Forward Email token as a Key Vault reference, not a store value.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@apps/api/README.md`:
- Around line 9-11: Update the local Azure setup documentation near the func
start requirements to state that the signed-in user must have App Configuration
Data Reader on ssd-postkit-appcs-prod-ae and Key Vault Secrets User on
ssd-global-kv-prod-ae, while preserving the existing guidance not to store
tenant profiles or tokens in local.settings.json.
In `@apps/api/src/config/app-configuration.ts`:
- Around line 71-73: Update ensureAppConfiguration so a rejected
loadAppConfiguration promise clears loadOnce before rethrowing the error,
allowing later invocations to retry after recovery while preserving
successful-load caching.
In `@apps/api/src/functions/contact.ts`:
- Line 11: Move the ensureAppConfiguration call into the handler’s existing
try/catch so load failures from App Configuration iteration or Key Vault
resolution are caught. Return the configured 503 unavailable response through
the same path, preserving CORS handling.
- Around line 19-20: Update the rate-limiting setup around clientIpFromHeaders
and getContactRateLimiter so it uses a platform-trusted client address or
restricts ingress to a proxy that overwrites forwarded IP headers; do not rely
on caller-supplied X-Forwarded-For, X-Client-IP, or X-Real-IP values.
In `@infra/function-app.bicep`:
- Around line 165-172: Add a conditional Key Vault Secrets User role assignment
for githubOidcPrincipalId alongside appConfigOidcOwner, using the Key Vault
resource as scope and the existing role-assignment conventions. Ensure this RBAC
assignment is provisioned before the workflow’s initial az keyvault secret show
check.
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📒 Files selected for processing (19)
.github/workflows/deploy-api.ymlSETUP.mdapps/api/README.mdapps/api/local.settings.json.exampleapps/api/package.jsonapps/api/src/config/app-configuration.spec.tsapps/api/src/config/app-configuration.tsapps/api/src/contact-rate-limit.tsapps/api/src/contact.spec.tsapps/api/src/contact.tsapps/api/src/functions/contact.tsapps/api/src/host-profiles.spec.tsdocs/architecture/overview.mddocs/email-forward-email.mddocs/pr-pipelines.mdinfra/README.mdinfra/appconfig-seed.jsoninfra/function-app.bicepscripts/seed-appconfig.sh
🚧 Files skipped from review as they are similar to previous changes (2)
- infra/README.md
- apps/api/src/contact.ts
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Retry App Config loads after failure, return 503 from contact, take the platform client IP, and grant OIDC Key Vault read after deploy.
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In @.github/workflows/deploy-api.yml:
- Around line 103-117: Extend the retry window in the “Assert KV secret exists”
step to at least 10 minutes, updating the loop and delay consistently while
preserving the existing az keyvault secret show check and failure behavior.
In `@apps/api/src/contact-rate-limit.ts`:
- Around line 91-97: Normalize the fallback IP in the X-Forwarded-For handling
around hops and last so an optional source port is removed without breaking
valid IPv6 addresses, then validate the normalized value before returning it as
the rate-limit key. Add coverage for 10.0.0.1:49152 producing 10.0.0.1, and
verify the expected forwarded-address format for each deployed ingress route.
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.github/workflows/deploy-api.ymlapps/api/README.mdapps/api/src/config/app-configuration.spec.tsapps/api/src/config/app-configuration.tsapps/api/src/contact-rate-limit.tsapps/api/src/contact.spec.tsapps/api/src/functions/contact.tsinfra/function-app.bicep
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Retry Key Vault reads for 10 minutes after Bicep assigns OIDC access. Normalize App Service `ip:port` hops so rate-limit keys stay per client.
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Closes #8
Parent: #2
Imported from: singleton-sd/poc-plattform-kit#272
Summary
apps/apiAzure Functions app: anonymousPOST /contact(CORS, rate limit, host-profile send) andGET /health.@singleton-sd/post-kit-email. Untrusted Origins cannot select another PoC’s sender/inbox.rg-ssd-global: Y1 Linux Consumption planssd-postkit-plan-prod-ae, Functionssd-postkit-api-prod-ae, storagessdpostkitstprodae, existing KVssd-global-kv-prod-ae.CONTACT_EMAIL_PROFILES_BY_HOST(InkAds + Plattform Kit examples).deploy-api.ymlOIDC → bicep + zip (vendors the email package). Skips Azure ifAZURE_*Variables are missing.Test plan
Setup
Steps and expected results
pnpm --filter @singleton-sd/post-kit-api testinfra/function-app.bicepapp settingsCONTACT_EMAIL_PROFILES_BY_HOST, KV ref forFORWARD_EMAIL_TOKEN, no secret values./contactfrom an allowlisted Origin uses the mapped inbox.Feedback focus
rg-ssd-globalvs sharing another plan.Automated checks
pnpm --filter @singleton-sd/post-kit-api test— 17 passed locallySummary by CodeRabbit
New Features
Documentation
Tests