refactor(workflow): publish weekly menus through API

Use SigV4 requests for settings and menu publication so the scheduled workflow no longer needs direct DynamoDB access.

.github/workflows/weekly-menu.yml

@@ -92,22 +92,12 @@ jobs:
         if: env.SKIP_RUN != 'true'
         id: discount
         run: |
-          RESULT=$(aws dynamodb get-item \
-            --table-name meal-order-manager-orders \
-            --key '{"PK":{"S":"CONFIG"},"SK":{"S":"SETTINGS"}}' \
-            --output json 2>/dev/null || echo '{}')
-          BULK=$(echo "$RESULT" | python3 -c "
-          import sys, json
-          d = json.load(sys.stdin)
-          print(d.get('Item',{}).get('bulk_discount_percent',{}).get('N','0'))
-          " 2>/dev/null || echo "0")
-          SUBSIDY=$(echo "$RESULT" | python3 -c "
-          import sys, json
-          d = json.load(sys.stdin)
-          print(d.get('Item',{}).get('company_subsidy_percent',{}).get('N','0'))
-          " 2>/dev/null || echo "0")
-          echo "bulk_discount=$BULK" >> $GITHUB_OUTPUT
-          echo "company_subsidy=$SUBSIDY" >> $GITHUB_OUTPUT
+          SETTINGS=$(python3 scripts/upload_menu.py settings \
+            --api-url "${{ steps.stack.outputs.api_url }}")
+          BULK=$(python3 -c 'import json,sys; print(json.loads(sys.argv[1])["bulk_discount_percent"])' "$SETTINGS")
+          SUBSIDY=$(python3 -c 'import json,sys; print(json.loads(sys.argv[1])["company_subsidy_percent"])' "$SETTINGS")
+          echo "bulk_discount=$BULK" >> "$GITHUB_OUTPUT"
+          echo "company_subsidy=$SUBSIDY" >> "$GITHUB_OUTPUT"
 
       - name: Get Google Client ID
         if: env.SKIP_RUN != 'true'
@@ -132,9 +122,11 @@ jobs:
             --company-subsidy "${{ steps.discount.outputs.company_subsidy }}" \
             --google-client-id "${{ steps.google.outputs.client_id }}"
 
-      - name: Upload menu to DynamoDB
+      - name: Publish menu through API
         if: env.SKIP_RUN != 'true'
-        run: python3 scripts/upload_menu.py
+        run: |
+          python3 scripts/upload_menu.py publish \
+            --api-url "${{ steps.stack.outputs.api_url }}"
 
       - name: Upload form to S3
         if: env.SKIP_RUN != 'true'

README.md

@@ -14,7 +14,7 @@ Monday 7:30am ET                     Employees (Mon–Thu)               Thursda
 ┌─────────────────┐                  ┌──────────────────┐              ┌──────────────────┐
 │  GitHub Actions  │                 │  orders.seahaven │              │  EventBridge      │
 │  - Scrape menu   │────S3 upload───▶│  ind.com         │              │  - Close form     │
-│  - Generate form │  + DynamoDB     │  (CloudFront+S3) │──POST───┐    │  - Aggregate      │
+│  - Generate form │  + signed API   │  (CloudFront+S3) │──POST───┐    │  - Aggregate      │
 │  - Slack notify  │                 └──────────────────┘         │    │  - Slack summary  │
 └─────────────────┘                                               ▼    └──────────────────┘
                                                           ┌──────────┐
@@ -50,6 +50,25 @@ the generated HTML, and the generated deployment artifact remains self-contained
 | Thursday 10am ET | DM employees who haven't ordered yet | EventBridge → Lambda → Slack DM |
 | Thursday 6pm ET | Close form, aggregate orders, write CSV reports + weekly summary PDF, post Redefine order summary to Slack | EventBridge → Lambda chain |
 
+### Weekly menu publication boundary
+
+The scheduled GitHub workflow has no DynamoDB permissions. It signs two requests
+with its short-lived OIDC role credentials:
+
+- `GET /api/publish/settings` returns only the bulk discount and company subsidy.
+- `POST /api/publish/menu` validates and writes the current Eastern-time week's menu.
+
+Both routes use API Gateway `AWS_IAM` authorization and invoke the existing
+submit-order Lambda. The GitHub role can invoke only these method and path
+combinations. Employee orders, the roster, admin configuration, and all direct
+DynamoDB actions remain inaccessible to the role.
+
+Deploy the API routes before switching the workflow and IAM policy. No data
+migration is required because the Lambda writes the existing `WEEK#...` / `MENU`
+record shape. To roll back, restore the previous workflow and its DynamoDB policy
+together; restoring only the policy does not make the API-based workflow depend on
+DynamoDB access.
+
 ### Reports (written to `meal-order-manager-reports-*` at Thursday close)
 
 | Key | Contents |

scripts/upload_menu.py

@@ -1,60 +1,102 @@
-"""
-Uploads the latest scraped menu JSON to DynamoDB.
-Used by the GitHub Actions weekly workflow after scraping.
-"""
+"""Call the IAM-protected weekly-menu publication API with SigV4."""
 
+import argparse
 import json
 import os
 import sys
-from datetime import datetime
-from decimal import Decimal
+import urllib.error
+import urllib.request
 from pathlib import Path
 
 import boto3
+from botocore.auth import SigV4Auth
+from botocore.awsrequest import AWSRequest
 
 PROJECT_ROOT = Path(__file__).resolve().parents[1]
 OUTPUT_DIR = PROJECT_ROOT / "output"
-TABLE_NAME = os.environ.get("TABLE_NAME", "meal-order-manager-orders")
 
 
-def convert_floats(obj):
-    if isinstance(obj, float):
-        return Decimal(str(obj))
-    if isinstance(obj, dict):
-        return {k: convert_floats(v) for k, v in obj.items()}
-    if isinstance(obj, list):
-        return [convert_floats(i) for i in obj]
-    return obj
+def signed_request(
+    api_url: str,
+    path: str,
+    method: str = "GET",
+    body: dict | None = None,
+    region: str = "us-east-1",
+) -> dict:
+    data = json.dumps(body).encode() if body is not None else None
+    headers = {"Content-Type": "application/json"} if data is not None else {}
+    request = AWSRequest(
+        method=method,
+        url=f"{api_url.rstrip('/')}{path}",
+        data=data,
+        headers=headers,
+    )
+    credentials = boto3.Session().get_credentials()
+    if credentials is None:
+        raise RuntimeError("AWS credentials are required")
+    SigV4Auth(credentials.get_frozen_credentials(), "execute-api", region).add_auth(
+        request
+    )
+
+    prepared = request.prepare()
+    http_request = urllib.request.Request(
+        prepared.url,
+        data=prepared.body,
+        headers=dict(prepared.headers),
+        method=method,
+    )
+    try:
+        with urllib.request.urlopen(http_request, timeout=30) as response:
+            return json.loads(response.read())
+    except urllib.error.HTTPError as exc:
+        detail = exc.read().decode(errors="replace")
+        raise RuntimeError(f"Publication API returned HTTP {exc.code}: {detail}") from exc
+
+
+def get_settings(api_url: str, region: str) -> dict:
+    return signed_request(
+        api_url, "/api/publish/settings", method="GET", region=region
+    )
+
+
+def publish_menu(api_url: str, region: str) -> dict:
+    files = sorted(OUTPUT_DIR.glob("menu-*.json"), reverse=True)
+    if not files:
+        raise RuntimeError("No menu JSON found. Run scrape_menu.py first.")
+
+    with files[0].open() as menu_file:
+        menu = json.load(menu_file)
+    return signed_request(
+        api_url,
+        "/api/publish/menu",
+        method="POST",
+        body=menu,
+        region=region,
+    )
 
 
 def main():
-    files = sorted(OUTPUT_DIR.glob("menu-*.json"), reverse=True)
-    if not files:
-        print("Error: No menu JSON found. Run scrape_menu.py first.", file=sys.stderr)
-        sys.exit(1)
+    parser = argparse.ArgumentParser()
+    parser.add_argument("action", choices=("settings", "publish"))
+    parser.add_argument("--api-url", required=True)
+    parser.add_argument(
+        "--region", default=os.environ.get("AWS_REGION", "us-east-1")
+    )
+    args = parser.parse_args()
 
-    with open(files[0]) as f:
-        menu = json.load(f)
+    try:
+        result = (
+            get_settings(args.api_url, args.region)
+            if args.action == "settings"
+            else publish_menu(args.api_url, args.region)
+        )
+    except (OSError, RuntimeError, ValueError, json.JSONDecodeError) as exc:
+        print(f"Error: {exc}", file=sys.stderr)
+        return 1
 
-    week = datetime.now().strftime("%Y-W%U")
-    table = boto3.resource("dynamodb").Table(TABLE_NAME)
-
-    import time
-
-    item = {
-        "PK": f"WEEK#{week}",
-        "SK": "MENU",
-        "form_status": "open",
-        "scraped_at": menu.get("scraped_at"),
-        "menu_url": menu.get("menu_url"),
-        "meal_count": menu.get("meal_count"),
-        "meals": convert_floats(menu.get("meals", [])),
-        "ttl": int(time.time()) + (90 * 86400),
-    }
-
-    table.put_item(Item=item)
-    print(f"Uploaded menu for {week} to DynamoDB ({len(menu.get('meals', []))} meals)")
+    print(json.dumps(result))
+    return 0
 
 
 if __name__ == "__main__":
-    main()
+    sys.exit(main())

tests/test_generate_form.py

@@ -153,6 +153,28 @@ class TestGenerateFormStructural:
         assert "ThrottlingBurstLimit: 10" in submit_settings
         assert "ThrottlingRateLimit: 5" in submit_settings
 
+    def test_weekly_menu_uses_iam_protected_api_without_dynamodb(self):
+        template = (REPO_ROOT / "template.yaml").read_text()
+        workflow = (REPO_ROOT / ".github" / "workflows" / "weekly-menu.yml").read_text()
+        script = (REPO_ROOT / "scripts" / "upload_menu.py").read_text()
+
+        for route in ("/api/publish/settings", "/api/publish/menu"):
+            next_event = (
+                "        PublishMenu:"
+                if route == "/api/publish/settings"
+                else "        AdminOrders:"
+            )
+            route_config = template.split(f"Path: {route}", 1)[1].split(
+                next_event, 1
+            )[0]
+            assert "Authorizer: AWS_IAM" in route_config
+            assert route in script
+
+        assert "scripts/upload_menu.py settings" in workflow
+        assert "scripts/upload_menu.py publish" in workflow
+        assert "aws dynamodb" not in workflow
+        assert "boto3.resource(\"dynamodb\")" not in script
+
     def test_local_and_google_render(self):
         local = _render(google=False)
         google = _render(google=True)