coverart.go

@@ -36,6 +36,57 @@ func headCoverArt(url string) string {
 	return location
 }
 
+const (
+	caaCacheTTLHit  int64 = 24 * 60 * 60 // 24 hours for resolved artwork
+	caaCacheTTLMiss int64 = 4 * 60 * 60  // 4 hours for misses
+)
+
+// getImageViaCoverArt checks the Cover Art Archive for album artwork.
+// Tries the release first, then falls back to the release group.
+// Returns the archive.org image URL on success, "" on failure.
+func getImageViaCoverArt(mbzAlbumID, mbzReleaseGroupID string) string {
+	if mbzAlbumID == "" && mbzReleaseGroupID == "" {
+		return ""
+	}
+
+	// Determine cache key: use album ID when available, otherwise release group ID
+	cacheKey := "caa.artwork." + mbzAlbumID
+	if mbzAlbumID == "" {
+		cacheKey = "caa.artwork.rg." + mbzReleaseGroupID
+	}
+
+	// Check cache
+	cachedURL, exists, err := host.CacheGetString(cacheKey)
+	if err == nil && exists {
+		pdk.Log(pdk.LogDebug, fmt.Sprintf("CAA cache hit for %s", cacheKey))
+		return cachedURL
+	}
+
+	// Try release first
+	var imageURL string
+	if mbzAlbumID != "" {
+		imageURL = headCoverArt(fmt.Sprintf("https://coverartarchive.org/release/%s/front-500", mbzAlbumID))
+	}
+
+	// Fall back to release group
+	if imageURL == "" && mbzReleaseGroupID != "" {
+		imageURL = headCoverArt(fmt.Sprintf("https://coverartarchive.org/release-group/%s/front-500", mbzReleaseGroupID))
+	}
+
+	// Cache the result (hit or miss)
+	ttl := caaCacheTTLHit
+	if imageURL == "" {
+		ttl = caaCacheTTLMiss
+	}
+	_ = host.CacheSetString(cacheKey, imageURL, ttl)
+
+	if imageURL != "" {
+		pdk.Log(pdk.LogDebug, fmt.Sprintf("CAA resolved artwork for %s: %s", cacheKey, imageURL))
+	}
+
+	return imageURL
+}
+
 // uguu.se API response
 type uguuResponse struct {
 	Success bool `json:"success"`

coverart_test.go

@@ -161,3 +161,98 @@ var _ = Describe("getImageURL", func() {
 		})
 	})
 })
+
+var _ = Describe("getImageViaCoverArt", func() {
+	BeforeEach(func() {
+		pdk.ResetMock()
+		host.CacheMock.ExpectedCalls = nil
+		host.CacheMock.Calls = nil
+		host.HTTPMock.ExpectedCalls = nil
+		host.HTTPMock.Calls = nil
+		pdk.PDKMock.On("Log", mock.Anything, mock.Anything).Maybe()
+	})
+
+	It("returns cached URL on cache hit", func() {
+		host.CacheMock.On("GetString", "caa.artwork.album-123").Return("https://archive.org/cached.jpg", true, nil)
+
+		result := getImageViaCoverArt("album-123", "rg-456")
+		Expect(result).To(Equal("https://archive.org/cached.jpg"))
+		host.HTTPMock.AssertNotCalled(GinkgoT(), "Send", mock.Anything)
+	})
+
+	It("returns empty on cache hit with empty string (known miss)", func() {
+		host.CacheMock.On("GetString", "caa.artwork.album-123").Return("", true, nil)
+
+		result := getImageViaCoverArt("album-123", "rg-456")
+		Expect(result).To(BeEmpty())
+		host.HTTPMock.AssertNotCalled(GinkgoT(), "Send", mock.Anything)
+	})
+
+	It("returns release URL on 307 and caches it", func() {
+		host.CacheMock.On("GetString", "caa.artwork.album-123").Return("", false, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release/album-123/front-500"
+		})).Return(&host.HTTPResponse{
+			StatusCode: 307,
+			Headers:    map[string]string{"Location": "https://archive.org/release-art.jpg"},
+		}, nil)
+		host.CacheMock.On("SetString", "caa.artwork.album-123", "https://archive.org/release-art.jpg", int64(86400)).Return(nil)
+
+		result := getImageViaCoverArt("album-123", "rg-456")
+		Expect(result).To(Equal("https://archive.org/release-art.jpg"))
+		host.CacheMock.AssertCalled(GinkgoT(), "SetString", "caa.artwork.album-123", "https://archive.org/release-art.jpg", int64(86400))
+	})
+
+	It("falls back to release-group when release returns 404", func() {
+		host.CacheMock.On("GetString", "caa.artwork.album-123").Return("", false, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release/album-123/front-500"
+		})).Return(&host.HTTPResponse{StatusCode: 404}, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release-group/rg-456/front-500"
+		})).Return(&host.HTTPResponse{
+			StatusCode: 307,
+			Headers:    map[string]string{"Location": "https://archive.org/rg-art.jpg"},
+		}, nil)
+		host.CacheMock.On("SetString", "caa.artwork.album-123", "https://archive.org/rg-art.jpg", int64(86400)).Return(nil)
+
+		result := getImageViaCoverArt("album-123", "rg-456")
+		Expect(result).To(Equal("https://archive.org/rg-art.jpg"))
+	})
+
+	It("caches empty string when both release and release-group fail", func() {
+		host.CacheMock.On("GetString", "caa.artwork.album-123").Return("", false, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release/album-123/front-500"
+		})).Return(&host.HTTPResponse{StatusCode: 404}, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release-group/rg-456/front-500"
+		})).Return(&host.HTTPResponse{StatusCode: 404}, nil)
+		host.CacheMock.On("SetString", "caa.artwork.album-123", "", int64(14400)).Return(nil)
+
+		result := getImageViaCoverArt("album-123", "rg-456")
+		Expect(result).To(BeEmpty())
+		host.CacheMock.AssertCalled(GinkgoT(), "SetString", "caa.artwork.album-123", "", int64(14400))
+	})
+
+	It("tries only release-group when MBZAlbumID is empty", func() {
+		host.CacheMock.On("GetString", "caa.artwork.rg.rg-456").Return("", false, nil)
+		host.HTTPMock.On("Send", mock.MatchedBy(func(req host.HTTPRequest) bool {
+			return req.URL == "https://coverartarchive.org/release-group/rg-456/front-500"
+		})).Return(&host.HTTPResponse{
+			StatusCode: 307,
+			Headers:    map[string]string{"Location": "https://archive.org/rg-art.jpg"},
+		}, nil)
+		host.CacheMock.On("SetString", "caa.artwork.rg.rg-456", "https://archive.org/rg-art.jpg", int64(86400)).Return(nil)
+
+		result := getImageViaCoverArt("", "rg-456")
+		Expect(result).To(Equal("https://archive.org/rg-art.jpg"))
+	})
+
+	It("returns empty when both IDs are empty", func() {
+		result := getImageViaCoverArt("", "")
+		Expect(result).To(BeEmpty())
+		host.HTTPMock.AssertNotCalled(GinkgoT(), "Send", mock.Anything)
+		host.CacheMock.AssertNotCalled(GinkgoT(), "GetString", mock.Anything)
+	})
+})