Serializer and Deserializer for java.sql.Blob for Jackson

ccm-cms/src/main/java/org/librecms/assets/BinaryAsset.java

@@ -38,10 +38,12 @@ import javax.persistence.Table;
 import org.hibernate.envers.Audited;
 import org.hibernate.envers.NotAudited;
 import org.libreccm.core.UnexpectedErrorException;
+import org.libreccm.imexport.BlobJsonDeserializer;
+import org.libreccm.imexport.BlobJsonSerializer;
 import org.libreccm.jpa.utils.MimeTypeConverter;
 import org.libreccm.l10n.LocalizedString;
-import org.libreccm.ui.admin.imexport.MimeTypeJsonDeserializer;
+import org.libreccm.imexport.MimeTypeJsonDeserializer;
-import org.libreccm.ui.admin.imexport.MimeTypeJsonSerializer;
+import org.libreccm.imexport.MimeTypeJsonSerializer;
 import org.librecms.contentsection.privileges.AssetPrivileges;
 
 import java.io.InputStream;
@@ -161,6 +163,8 @@ public class BinaryAsset extends Asset implements Serializable {
     @Lob
     @Basic(fetch = FetchType.LAZY)
     @NotAudited // Workaround until bug in Hibernate is resolved: https://hibernate.atlassian.net/browse/HHH-14725
+    @JsonSerialize(using = BlobJsonSerializer.class)
+    @JsonDeserialize(using = BlobJsonDeserializer.class)
     private Blob data;
 
     @Column(name = "DATA_SIZE")

ccm-core/src/main/java/org/libreccm/imexport/BlobJsonDeserializer.java

@@ -0,0 +1,127 @@
+package org.libreccm.imexport;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import org.hibernate.engine.jdbc.BlobProxy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.Blob;
+
+import static java.lang.System.out;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class BlobJsonDeserializer extends JsonDeserializer<Blob> {
+
+    @Override
+    public Blob deserialize(
+        final JsonParser parser,
+        final DeserializationContext ctxt
+    ) throws IOException, JsonProcessingException {
+        final Path tmpFilePath = Files.createTempFile("upload", "import");
+        try(OutputStream outputStream = Files.newOutputStream(tmpFilePath)) {
+            parser.readBinaryValue(outputStream);
+            final Blob data = BlobProxy.generateProxy(
+                new UploadInputStream(tmpFilePath), 
+                -1
+            );
+            
+            return data;
+        }
+    }
+    
+    private class UploadInputStream extends InputStream {
+
+        private final Path tmpFilePath;
+
+        private InputStream inputStream;
+
+        public UploadInputStream(final Path tmpFilePath) {
+            this.tmpFilePath = tmpFilePath;
+        }
+
+        @Override
+        public int available() throws IOException {
+            openNewInputStreamIfNecessary();
+            return inputStream.available();
+        }
+
+        @Override
+        public void close() throws IOException {
+            if (inputStream != null) {
+                inputStream.close();
+                inputStream = null;
+            }
+        }
+
+        @Override
+        public void mark(final int readLimit) {
+            try {
+                openNewInputStreamIfNecessary();
+            } catch (IOException ex) {
+                throw new RuntimeException(ex);
+            }
+            inputStream.mark(readLimit);
+        }
+
+        @Override
+        public boolean markSupported() {
+            try {
+                openNewInputStreamIfNecessary();
+            } catch (IOException ex) {
+                throw new RuntimeException(ex);
+            }
+            return inputStream.markSupported();
+        }
+
+        @Override
+        public int read() throws IOException {
+            openNewInputStreamIfNecessary();
+            return inputStream.read();
+        }
+
+        @Override
+        public int read(final byte[] data) throws IOException {
+            openNewInputStreamIfNecessary();
+            return inputStream.read(data);
+        }
+
+        @Override
+        public int read(final byte[] data, final int offset, final int length)
+            throws IOException {
+            openNewInputStreamIfNecessary();
+            return inputStream.read(data, offset, length);
+        }
+
+        @Override
+        public void reset() throws IOException {
+            if (inputStream == null) {
+                openNewInputStreamIfNecessary();
+            } else {
+                inputStream.reset();
+            }
+        }
+
+        @Override
+        public long skip(long nBytes) throws IOException {
+            openNewInputStreamIfNecessary();
+            return inputStream.skip(nBytes);
+        }
+
+        private void openNewInputStreamIfNecessary() throws IOException {
+            if (inputStream == null) {
+                inputStream = Files.newInputStream(tmpFilePath);
+            }
+        }
+
+    }
+
+}

ccm-core/src/main/java/org/libreccm/imexport/BlobJsonSerializer.java

@@ -0,0 +1,31 @@
+package org.libreccm.imexport;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+import java.sql.Blob;
+import java.sql.SQLException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class BlobJsonSerializer extends JsonSerializer<Blob> {
+
+    @Override
+    public void serialize(
+        final Blob value,
+        final JsonGenerator generator,
+        final SerializerProvider serializers
+    ) throws IOException {
+        try {
+            generator.writeFieldName("data");
+            generator.writeBinary(value.getBinaryStream(), -1);
+        } catch (SQLException ex) {
+            throw new IOException(ex);
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/imexport/MimeTypeJsonDeserializer.java

@@ -1,10 +1,9 @@
-package org.libreccm.ui.admin.imexport;
+package org.libreccm.imexport;
 
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JsonDeserializer;
-import com.fasterxml.jackson.databind.JsonNode;
 
 import java.io.IOException;
 

ccm-core/src/main/java/org/libreccm/imexport/MimeTypeJsonSerializer.java

@@ -1,4 +1,4 @@
-package org.libreccm.ui.admin.imexport;
+package org.libreccm.imexport;
 
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.databind.JsonSerializer;