bud 08 implemented

IMPLEMENTATION.md

@@ -175,14 +175,46 @@ This document tracks the implementation status of ginxsom, a high-performance Fa
 
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-## BUD-08: NIP-94 Metadata ⚪ **NOT IMPLEMENTED**
+## BUD-08: NIP-94 File Metadata Tags ✅ **COMPLETE**
 
-*Optional feature - not currently planned*
+### NIP-94 Integration
+- [x] Configuration system with SQLite server_config table
+- [x] `nip94_enabled` configuration key (default: true)
+- [x] `cdn_origin` configuration key (default: "http://localhost:9001")
+- [x] Centralized MIME type to extension mapping [`mime_to_extension()`](src/main.c:2024)
+- [x] Canonical blob URL generation [`nip94_build_blob_url()`](src/main.c:2055)
+- [x] NIP-94 metadata field emission [`nip94_emit_field()`](src/main.c:2201)
 
-- [ ] NIP-94 tag generation
-- [ ] Extended blob descriptor responses
-- [ ] Magnet link generation
-- [ ] Metadata compatibility testing
+### Image Dimension Detection
+- [x] PNG dimension parsing from IHDR chunk [`parse_png_dimensions()`](src/main.c:2065)
+- [x] JPEG dimension parsing from SOF0/SOF2 markers [`parse_jpeg_dimensions()`](src/main.c:2089)
+- [x] WebP dimension parsing for VP8/VP8L/VP8X formats [`parse_webp_dimensions()`](src/main.c:2141)
+- [x] Universal dimension dispatcher [`nip94_get_dimensions()`](src/main.c:2184)
+
+### Integration Points
+- [x] PUT /upload endpoint enhanced with NIP-94 metadata
+- [x] PUT /mirror endpoint enhanced with NIP-94 metadata
+- [x] Configuration-driven origin override for CDN support
+- [x] Conditional metadata emission based on `nip94_enabled` setting
+- [x] Proper JSON comma handling for optional nip94 field
+
+### NIP-94 Tags Implemented
+- [x] `url` tag - Canonical blob URL with proper origin and extension
+- [x] `m` tag - MIME type (Content-Type)
+- [x] `x` tag - SHA-256 hash (lowercase hex)
+- [x] `size` tag - File size in bytes
+- [x] `dim` tag - Image dimensions (e.g., "1x1", "1920x1080") when available
+
+### Configuration Keys
+- `nip94_enabled` (boolean): Enable/disable NIP-94 metadata emission (default: true)
+- `cdn_origin` (string): Base URL for blob URLs (default: "http://localhost:9001")
+
+### Testing Status
+- [x] NIP-94 minimal tags (url, m, x, size) present in responses
+- [x] Image dimension detection working for PNG 1x1 test case
+- [x] Configuration-based enable/disable functionality
+- [x] CDN origin override affecting both descriptor and nip94 URLs
+- [x] Mirror endpoint NIP-94 integration (network-dependent)
 
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