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satellite-provider/_docs/02_document/modules/api_program.md
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Oleksandr Bezdieniezhnykh 96cd3c4495
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[AZ-487] JWT validation baseline (HS256, all endpoints)
Adds Microsoft.AspNetCore.Authentication.JwtBearer 8.0.21 and the
SatelliteProvider.Api.Authentication.AddSatelliteJwt extension that
validates HS256 tokens against a shared JWT_SECRET (>=32 bytes, fail
fast at startup). Every minimal-API endpoint now carries
.RequireAuthorization(); the middleware chain is UseExceptionHandler ->
UseHttpsRedirection -> UseCors -> UseAuthentication -> UseAuthorization
-> endpoints. Swagger UI gets a Bearer security definition so the
Authorize button works.

Test infrastructure: JwtTokenFactory (unit) and JwtTestHelpers
(integration) mint deterministic tokens against the same secret; the
integration test runner attaches a default Bearer token to its shared
HttpClient so existing tests continue to exercise protected endpoints.
JwtIntegrationTests adds AC-1..AC-4 and AC-7 (Swagger advertises
Bearer) end-to-end; AuthenticationServiceCollectionExtensionsTests
covers AC-5 (missing/empty/short secret fail-fast) plus env-var
precedence; JwtTokenFactoryTests covers AC-6 (claims pass through
the JwtSecurityTokenHandler.ValidateToken path JwtBearer uses).

docker-compose and scripts/run-tests.sh now propagate JWT_SECRET to
the api and integration-tests containers, with a >=32-byte guard.
.env.example documents the required keys; .env stays gitignored.

Code review verdict: PASS_WITH_WARNINGS (2 Low findings surfaced
in _docs/03_implementation/reviews/batch_01_cycle2_review.md).

Cross-component coordination: gps-denied-onboard and the mission
planner UI must attach Bearer tokens before this lands in dev.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-11 23:06:23 +03:00

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# Module: Api/Program.cs
## Purpose
Application entry point. Configures DI container, sets up middleware, defines minimal API endpoints, runs database migrations on startup, and starts background services.
## Public Interface
### API Endpoints
| Method | Route | Handler | Description |
|--------|-------|---------|-------------|
| GET | `/tiles/{z}/{x}/{y}` | `ServeTile` | Slippy map tile server with in-memory caching |
| GET | `/api/satellite/tiles/latlon` | `GetTileByLatLon` | Download single tile by lat/lon/zoom |
| GET | `/api/satellite/tiles/mgrs` | `GetSatelliteTilesByMgrs` | MGRS stub (returns empty) |
| POST | `/api/satellite/upload` | `UploadImage` | Image upload stub (returns `Success: false`) |
| POST | `/api/satellite/request` | `RequestRegion` | Queue region for async tile processing |
| GET | `/api/satellite/region/{id}` | `GetRegionStatus` | Get region processing status |
| POST | `/api/satellite/route` | `CreateRoute` | Create route with intermediate points |
| GET | `/api/satellite/route/{id}` | `GetRoute` | Get route with all points |
### Local Records (defined in Program.cs)
- `GetSatelliteTilesResponse`, `SatelliteTile` — MGRS response stubs
- `UploadImageRequest` — multipart form data request
- `SaveResult` — upload response stub
- `DownloadTileResponse` — tile download response
- `RequestRegionRequest` — region request body
- `ParameterDescriptionFilter` — Swagger operation filter
## Internal Logic
### DI Registration
1. Serilog configured from `appsettings.json`
2. Connection string extracted from `ConnectionStrings:DefaultConnection`
3. Config bindings: `MapConfig`, `StorageConfig`, `ProcessingConfig`
4. Singletons: repositories (`TileRepository`, `RegionRepository`, `RouteRepository`), `GoogleMapsDownloaderV2`, `ITileService`, `IRegionService`, `IRouteService`
5. `IRegionRequestQueue` with configurable capacity
6. Hosted services: `RegionProcessingService`, `RouteProcessingService`
7. CORS policy: `TilesCors` — configured origins from `CorsConfig:AllowedOrigins`, falls back to allow-any
8. JSON options: camelCase, case-insensitive
9. **JWT authentication (AZ-487)**: `AddSatelliteJwt(builder.Configuration)` (extension in `SatelliteProvider.Api.Authentication`) registers `JwtBearer` with `TokenValidationParameters` set per the suite auth contract (signature + lifetime, no issuer/audience validation, 30 s clock skew, ≥ 32-byte HMAC key). Followed by `AddAuthorization()`.
### Startup
1. Database migration via `DatabaseMigrator.RunMigrations()` — throws on failure
2. Creates tiles and ready directories
3. Swagger enabled in Development mode
4. Middleware chain (order matters): `UseExceptionHandler``UseHttpsRedirection``UseCors("TilesCors")``UseAuthentication``UseAuthorization` → endpoint mapping.
5. Every `MapGet`/`MapPost` endpoint is decorated with `.RequireAuthorization()`; the framework returns 401 before the handler runs for any anonymous, expired, or invalid-signature request.
### ServeTile Handler
1. Checks `IMemoryCache` for tile bytes (1h absolute, 30min sliding expiration)
2. If cache miss: queries `ITileRepository.GetByTileCoordinatesAsync`
3. If no DB record: downloads tile via `GoogleMapsDownloaderV2.DownloadSingleTileAsync`, creates `TileEntity`, inserts
4. Returns image bytes with cache headers (`Cache-Control: public, max-age=86400`)
### GetTileByLatLon Handler
Downloads a tile, persists it, returns metadata as `DownloadTileResponse`.
### RequestRegion Handler
Validates size (10010000m), delegates to `IRegionService.RequestRegionAsync`.
## Dependencies
All project references: Common, DataAccess, Services.
NuGet: `Serilog.AspNetCore`, `Swashbuckle.AspNetCore`, `Microsoft.AspNetCore.OpenApi`, `Microsoft.AspNetCore.Authentication.JwtBearer` (8.0.21, AZ-487), `SixLabors.ImageSharp`, `Newtonsoft.Json`.
## Consumers
- HTTP clients (external)
- Integration tests (via HTTP)
## Data Models
Defines several local request/response records that are not shared with other projects.
## Configuration
All configuration sections are consumed here:
- `ConnectionStrings:DefaultConnection`
- `MapConfig`, `StorageConfig`, `ProcessingConfig`
- `CorsConfig:AllowedOrigins`
- `Jwt:Secret` — HMAC-SHA256 signing key for JWT validation (AZ-487). Resolution: `JWT_SECRET` env var (preferred, opaque production secret) → `Jwt:Secret` configuration key (`appsettings.Development.json` placeholder only). Startup fails fast if the resolved value is unset, empty, or shorter than 32 bytes.
- `Serilog` section
## External Integrations
- Google Maps (indirectly via `GoogleMapsDownloaderV2`)
- PostgreSQL (via repositories and DatabaseMigrator)
- File system (`./tiles/`, `./ready/`)
## Security
- CORS configured (permissive by default when no origins specified)
- Swagger only in Development; Bearer token "Authorize" button registered via `AddSecurityDefinition`/`AddSecurityRequirement` (AZ-487)
- HTTPS redirection enabled
- JWT bearer authentication (AZ-487) — every endpoint requires a valid HS256-signed token. Anonymous, expired, or signature-tampered requests return 401 before the handler runs. Per-endpoint permission claims are layered on top in subsequent PBIs (e.g. AZ-488 requires `permissions: ["GPS"]` on the upload endpoint).
## Tests
Integration tests exercise all endpoints. Unit test project has only a dummy test.