Added GET /lists/blacklist/addresses API endpoint

This returns a JSON array containing the blacklisted addresses.

src/main/java/org/qortal/api/resource/ListsResource.java

@@ -237,6 +237,21 @@ public class ListsResource {
 		}
 	}
 
+	@GET
+	@Path("/blacklist/addresses")
+	@Operation(
+			summary = "Fetch the list of blacklisted addresses",
+			responses = {
+					@ApiResponse(
+							description = "A JSON array of addresses",
+							content = @Content(mediaType = MediaType.APPLICATION_JSON, schema = @Schema(type = "boolean"))
+					)
+			}
+	)
+	public String getAddressBlacklist() {
+		return ResourceListManager.getInstance().getBlacklistJSONString();
+	}
+
 	@GET
 	@Path("/blacklist/address/{address}")
 	@Operation(

src/main/java/org/qortal/list/ResourceList.java

@@ -113,10 +113,12 @@ public class ResourceList {
     }
 
 
-
     /* Utils */
 
     public static String listToJSONString(List<String> list) {
+        if (list == null) {
+            return null;
+        }
         JSONArray items = new JSONArray();
         for (String item : list) {
             items.put(item);
@@ -125,6 +127,9 @@ public class ResourceList {
     }
 
     private static List<String> listFromJSONString(String jsonString) {
+        if (jsonString == null) {
+            return null;
+        }
         JSONArray jsonList = new JSONArray(jsonString);
         List<String> resourceList = new ArrayList<>();
         for (int i=0; i<jsonList.length(); i++) {
@@ -134,4 +139,8 @@ public class ResourceList {
         return resourceList;
     }
 
+    public String getJSONString() {
+        return ResourceList.listToJSONString(this.list);
+    }
+
 }

src/main/java/org/qortal/list/ResourceListManager.java

@@ -4,6 +4,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.io.IOException;
+import java.util.List;
 
 public class ResourceListManager {
 
@@ -84,4 +85,11 @@ public class ResourceListManager {
         this.addressBlacklist.revert();
     }
 
+    public String getBlacklistJSONString() {
+        if (this.addressBlacklist == null) {
+            return null;
+        }
+        return this.addressBlacklist.getJSONString();
+    }
+
 }