Add uguu.se artwork upload for private Navidrome instances (#4)

coverart.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/navidrome/navidrome/plugins/pdk/go/host"
+	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
+)
+
+// Configuration key for uguu.se image hosting
+const uguuEnabledKey = "uguuenabled"
+
+// uguu.se API response
+type uguuResponse struct {
+	Success bool `json:"success"`
+	Files   []struct {
+		URL string `json:"url"`
+	} `json:"files"`
+}
+
+// getImageURL retrieves the track artwork URL, optionally uploading to uguu.se.
+func getImageURL(username, trackID string) string {
+	uguuEnabled, _ := pdk.GetConfig(uguuEnabledKey)
+	if uguuEnabled == "true" {
+		return getImageViaUguu(username, trackID)
+	}
+	return getImageDirect(trackID)
+}
+
+// getImageDirect returns the artwork URL directly from Navidrome (current behavior).
+func getImageDirect(trackID string) string {
+	artworkURL, err := host.ArtworkGetTrackUrl(trackID, 300)
+	if err != nil {
+		pdk.Log(pdk.LogWarn, fmt.Sprintf("Failed to get artwork URL: %v", err))
+		return ""
+	}
+
+	// Don't use localhost URLs
+	if strings.HasPrefix(artworkURL, "http://localhost") {
+		return ""
+	}
+	return artworkURL
+}
+
+// getImageViaUguu fetches artwork and uploads it to uguu.se.
+func getImageViaUguu(username, trackID string) string {
+	// Check cache first
+	cacheKey := fmt.Sprintf("uguu.artwork.%s", trackID)
+	cachedURL, exists, err := host.CacheGetString(cacheKey)
+	if err == nil && exists {
+		pdk.Log(pdk.LogDebug, fmt.Sprintf("Cache hit for uguu artwork: %s", trackID))
+		return cachedURL
+	}
+
+	// Fetch artwork data from Navidrome
+	contentType, data, err := host.SubsonicAPICallRaw(fmt.Sprintf("/getCoverArt?u=%s&id=%s&size=300", username, trackID))
+	if err != nil {
+		pdk.Log(pdk.LogWarn, fmt.Sprintf("Failed to fetch artwork data: %v", err))
+		return ""
+	}
+
+	// Upload to uguu.se
+	url, err := uploadToUguu(data, contentType)
+	if err != nil {
+		pdk.Log(pdk.LogWarn, fmt.Sprintf("Failed to upload to uguu.se: %v", err))
+		return ""
+	}
+
+	_ = host.CacheSetString(cacheKey, url, 9000)
+	return url
+}
+
+// uploadToUguu uploads image data to uguu.se and returns the file URL.
+func uploadToUguu(imageData []byte, contentType string) (string, error) {
+	// Build multipart/form-data body manually (TinyGo-compatible)
+	boundary := "----NavidromeCoverArt"
+	var body []byte
+	body = append(body, []byte(fmt.Sprintf("--%s\r\n", boundary))...)
+	body = append(body, []byte(fmt.Sprintf("Content-Disposition: form-data; name=\"files[]\"; filename=\"cover.jpg\"\r\n"))...)
+	body = append(body, []byte(fmt.Sprintf("Content-Type: %s\r\n", contentType))...)
+	body = append(body, []byte("\r\n")...)
+	body = append(body, imageData...)
+	body = append(body, []byte(fmt.Sprintf("\r\n--%s--\r\n", boundary))...)
+
+	req := pdk.NewHTTPRequest(pdk.MethodPost, "https://uguu.se/upload")
+	req.SetHeader("Content-Type", fmt.Sprintf("multipart/form-data; boundary=%s", boundary))
+	req.SetBody(body)
+
+	resp := req.Send()
+	if resp.Status() >= 400 {
+		return "", fmt.Errorf("uguu.se upload failed: HTTP %d", resp.Status())
+	}
+
+	var result uguuResponse
+	if err := json.Unmarshal(resp.Body(), &result); err != nil {
+		return "", fmt.Errorf("failed to parse uguu.se response: %w", err)
+	}
+
+	if !result.Success || len(result.Files) == 0 {
+		return "", fmt.Errorf("uguu.se upload was not successful")
+	}
+
+	if result.Files[0].URL == "" {
+		return "", fmt.Errorf("uguu.se returned empty URL")
+	}
+
+	return result.Files[0].URL, nil
+}