Make User-Agent configurable via env var DISC_DROP_USER_AGENT

src/main/java/com/discdrop/client/UserAgentFilter.java

@@ -1,16 +1,22 @@
 package com.discdrop.client;
 
+import jakarta.enterprise.context.ApplicationScoped;
 import jakarta.ws.rs.client.ClientRequestContext;
 import jakarta.ws.rs.client.ClientRequestFilter;
 import jakarta.ws.rs.ext.Provider;
+import org.eclipse.microprofile.config.inject.ConfigProperty;
 import java.io.IOException;
 
 @Provider
+@ApplicationScoped
 public class UserAgentFilter implements ClientRequestFilter {
 
+    @ConfigProperty(name = "discdrop.user-agent",
+                    defaultValue = "DiscDrop/1.0 (https://gitea.t3du.com/droideparanoico/discdrop)")
+    String userAgent;
+
     @Override
     public void filter(ClientRequestContext requestContext) throws IOException {
-        requestContext.getHeaders().putSingle("User-Agent",
-            "DiscDrop/1.0 (david.alvarez.81@gmail.com)");
+        requestContext.getHeaders().putSingle("User-Agent", userAgent);
     }
 }

src/main/resources/application.properties

@@ -15,3 +15,6 @@ quarkus.jackson.fail-on-unknown-properties=false
 discdrop.db.path=${DISC_DROP_DB_PATH:data/discdrop.db}
 discdrop.cache.ttl-hours=${DISC_DROP_CACHE_TTL:8}
 discdrop.base-url=${DISC_DROP_BASE_URL:http://localhost:8080}
+
+# User-Agent sent to MusicBrainz API (env: DISC_DROP_USER_AGENT)
+discdrop.user-agent=${DISC_DROP_USER_AGENT:DiscDrop/1.0 (https://gitea.t3du.com/droideparanoico/discdrop)}