Added API endpoint to list all arbitrary resources, grouped by name and service

This is used by the UI to list available websites (and ultimately other categories of hosted data)

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

@@ -33,6 +33,7 @@ import org.qortal.arbitrary.ArbitraryDataTransactionBuilder;
 import org.qortal.arbitrary.exception.MissingDataException;
 import org.qortal.controller.Controller;
 import org.qortal.data.account.AccountData;
+import org.qortal.data.arbitrary.ArbitraryResourceInfo;
 import org.qortal.data.naming.NameData;
 import org.qortal.data.transaction.ArbitraryTransactionData;
 import org.qortal.data.transaction.ArbitraryTransactionData.*;
@@ -67,7 +68,42 @@ public class ArbitraryResource {
 	@Context HttpServletRequest request;
 	@Context HttpServletResponse response;
 	@Context ServletContext context;
-	
+
+	@GET
+	@Path("/resources")
+	@Operation(
+			summary = "List arbitrary resources available on chain, optionally filtered by service",
+			responses = {
+					@ApiResponse(
+							content = @Content(mediaType = MediaType.APPLICATION_JSON, schema = @Schema(implementation = ArbitraryResourceInfo.class))
+					)
+			}
+	)
+	@ApiErrors({ApiError.REPOSITORY_ISSUE})
+	public List<ArbitraryResourceInfo> getResources(
+			@QueryParam("service") Service service, @Parameter(
+			ref = "limit"
+	) @QueryParam("limit") Integer limit, @Parameter(
+			ref = "offset"
+	) @QueryParam("offset") Integer offset, @Parameter(
+			ref = "reverse"
+	) @QueryParam("reverse") Boolean reverse) {
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<ArbitraryResourceInfo> resources = repository.getArbitraryRepository()
+					.getArbitraryResources(service, limit, offset, reverse);
+
+			if (resources == null) {
+				return new ArrayList<>();
+			}
+			return resources;
+
+		} catch (DataException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+		}
+	}
+
+
 	@GET
 	@Path("/search")
 	@Operation(

src/main/java/org/qortal/data/arbitrary/ArbitraryResourceInfo.java

@@ -0,0 +1,17 @@
+package org.qortal.data.arbitrary;
+
+import org.qortal.data.transaction.ArbitraryTransactionData;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class ArbitraryResourceInfo {
+
+	public String name;
+	public ArbitraryTransactionData.Service service;
+
+	public ArbitraryResourceInfo() {
+	}
+
+}

src/main/java/org/qortal/repository/ArbitraryRepository.java

@@ -1,5 +1,6 @@
 package org.qortal.repository;
 
+import org.qortal.data.arbitrary.ArbitraryResourceInfo;
 import org.qortal.data.network.ArbitraryPeerData;
 import org.qortal.data.transaction.ArbitraryTransactionData;
 import org.qortal.data.transaction.ArbitraryTransactionData.*;
@@ -21,6 +22,9 @@ public interface ArbitraryRepository {
 	public ArbitraryTransactionData getLatestTransaction(String name, Service service, Method method) throws DataException;
 
 
+	public List<ArbitraryResourceInfo> getArbitraryResources(Service service, Integer limit, Integer offset, Boolean reverse) throws DataException;
+
+
 	public List<ArbitraryPeerData> getArbitraryPeerDataForSignature(byte[] signature) throws DataException;
 
 	public ArbitraryPeerData getArbitraryPeerDataForSignatureAndPeer(byte[] signature, String peerAddress) throws DataException;

src/main/java/org/qortal/repository/hsqldb/HSQLDBArbitraryRepository.java

@@ -1,5 +1,6 @@
 package org.qortal.repository.hsqldb;
 
+import org.qortal.data.arbitrary.ArbitraryResourceInfo;
 import org.qortal.crypto.Crypto;
 import org.qortal.data.PaymentData;
 import org.qortal.data.network.ArbitraryPeerData;
@@ -288,6 +289,53 @@ public class HSQLDBArbitraryRepository implements ArbitraryRepository {
 		}
 	}
 
+	@Override
+	public List<ArbitraryResourceInfo> getArbitraryResources(Service service, Integer limit, Integer offset, Boolean reverse) throws DataException {
+		StringBuilder sql = new StringBuilder(512);
+
+		sql.append("SELECT name, service FROM ArbitraryTransactions");
+
+		if (service != null) {
+			sql.append(" WHERE service = ");
+			sql.append(service.value);
+		}
+
+		sql.append(" GROUP BY name, service ORDER BY name");
+
+		if (reverse != null && reverse) {
+			sql.append(" DESC");
+		}
+
+		HSQLDBRepository.limitOffsetSql(sql, limit, offset);
+
+		List<ArbitraryResourceInfo> arbitraryResources = new ArrayList<>();
+
+		try (ResultSet resultSet = this.repository.checkedExecute(sql.toString())) {
+			if (resultSet == null)
+				return null;
+
+			do {
+				String name = resultSet.getString(1);
+				Service serviceResult = Service.valueOf(resultSet.getInt(2));
+
+				// We should filter out resources without names
+				if (name == null) {
+					continue;
+				}
+
+				ArbitraryResourceInfo arbitraryResourceInfo = new ArbitraryResourceInfo();
+				arbitraryResourceInfo.name = name;
+				arbitraryResourceInfo.service = serviceResult;
+
+				arbitraryResources.add(arbitraryResourceInfo);
+			} while (resultSet.next());
+
+			return arbitraryResources;
+		} catch (SQLException e) {
+			throw new DataException("Unable to fetch arbitrary transactions from repository", e);
+		}
+	}
+
 
 	// Peer file tracking