Added DELETE /resource/{service}/{name}/{identifier} API endpoint, to delete local data

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

@@ -401,6 +401,26 @@ public class ArbitraryResource {
 		}
 	}
 
+	@DELETE
+	@Path("/resource/{service}/{name}/{identifier}")
+	@Operation(
+			summary = "Delete arbitrary resource with supplied service, name and identifier",
+			responses = {
+					@ApiResponse(
+							content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "string"))
+					)
+			}
+	)
+	@SecurityRequirement(name = "apiKey")
+	public boolean deleteResource(@PathParam("service") Service service,
+								  @PathParam("name") String name,
+								  @PathParam("identifier") String identifier) {
+
+		Security.checkApiCallAllowed(request);
+		ArbitraryDataResource resource = new ArbitraryDataResource(name, ResourceIdType.NAME, service, identifier);
+		return resource.delete();
+	}
+
 	@POST
 	@Path("/compute")
 	@Operation(

src/main/java/org/qortal/arbitrary/ArbitraryDataResource.java

@@ -11,9 +11,14 @@ import org.qortal.list.ResourceListManager;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
 import org.qortal.repository.RepositoryManager;
+import org.qortal.settings.Settings;
 import org.qortal.utils.ArbitraryTransactionUtils;
+import org.qortal.utils.FilesystemUtils;
 import org.qortal.utils.NTP;
 
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -32,6 +37,11 @@ public class ArbitraryDataResource {
         this.resourceId = resourceId.toLowerCase();
         this.resourceIdType = resourceIdType;
         this.service = service;
+
+        // If identifier is a blank string, or reserved keyword "default", treat it as null
+        if (identifier == null || identifier.equals("") || identifier.equals("default")) {
+            identifier = null;
+        }
         this.identifier = identifier;
     }
 
@@ -81,6 +91,42 @@ public class ArbitraryDataResource {
         return new ArbitraryResourceSummary(ArbitraryResourceStatus.DOWNLOADED);
     }
 
+    public boolean delete() {
+        try {
+            this.fetchTransactions();
+
+            List<ArbitraryTransactionData> transactionDataList = new ArrayList<>(this.transactions);
+
+            for (ArbitraryTransactionData transactionData : transactionDataList) {
+                byte[] hash = transactionData.getData();
+                byte[] metadataHash = transactionData.getMetadataHash();
+                byte[] signature = transactionData.getSignature();
+                ArbitraryDataFile arbitraryDataFile = ArbitraryDataFile.fromHash(hash, signature);
+                arbitraryDataFile.setMetadataHash(metadataHash);
+
+                // Delete any chunks or complete files from each transaction
+                arbitraryDataFile.deleteAll();
+            }
+
+            // Also delete cached data for the entire resource
+            this.deleteCache();
+
+            return true;
+
+        } catch (DataException | IOException e) {
+            return false;
+        }
+    }
+
+    public void deleteCache() throws IOException {
+        String baseDir = Settings.getInstance().getTempDataPath();
+        String identifier = this.identifier != null ?  this.identifier : "default";
+        Path cachePath = Paths.get(baseDir, "reader", this.resourceIdType.toString(), this.resourceId, this.service.toString(), identifier);
+        if (cachePath.toFile().exists()) {
+            FilesystemUtils.safeDeleteDirectory(cachePath, true);
+        }
+    }
+
     private boolean allFilesDownloaded() {
         try {
             this.fetchTransactions();
@@ -229,7 +275,7 @@ public class ArbitraryDataResource {
 
     @Override
     public String toString() {
-        return String.format("%s %s %s %s", this.serviceString(), this.resourceIdString(), this.resourceIdTypeString(), this.identifierString());
+        return String.format("%s %s %s", this.serviceString(), this.resourceIdString(), this.identifierString());
     }
 
 

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataManager.java

@@ -1,5 +1,6 @@
 package org.qortal.controller.arbitrary;
 
+import java.io.IOException;
 import java.util.*;
 
 import org.apache.logging.log4j.LogManager;
@@ -343,6 +344,13 @@ public class ArbitraryDataManager extends Thread {
 
 			// Remove from the signature requests list now that we have all files for this signature
 			ArbitraryDataFileListManager.getInstance().removeFromSignatureRequests(signature58);
+
+			// Delete cached files themselves
+			try {
+				resource.deleteCache();
+			} catch (IOException e) {
+				LOGGER.info("Unable to delete cache for resource {}: {}", resource, e.getMessage());
+			}
 		}
 	}