/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.manifoldcf.agents.output.kafka;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.util.Iterator;
import org.apache.commons.io.IOUtils;
import org.apache.manifoldcf.agents.interfaces.RepositoryDocument;
import static org.apache.manifoldcf.agents.output.kafka.KafkaOutputConnector.allowAttributeName;
import static org.apache.manifoldcf.agents.output.kafka.KafkaOutputConnector.denyAttributeName;
import static org.apache.manifoldcf.agents.output.kafka.KafkaOutputConnector.noSecurityToken;
import static org.apache.manifoldcf.agents.output.kafka.KafkaOutputConnector.useNullValue;
import org.apache.manifoldcf.core.common.Base64;
/**
*
* @author tugba
*/
public class KafkaMessage {
private final String[] acls = null;
private final String[] denyAcls = null;
private final String[] shareAcls = null;
private final String[] shareDenyAcls = null;
private final String[] parentAcls = null;
private final String[] parentDenyAcls = null;
private InputStream inputStream = null;
public byte[] createJSON(RepositoryDocument document) {
String finalString = null;
// create temporaray byte array output stream
OutputStream out = new ByteArrayOutputStream();
try {
inputStream = document.getBinaryStream();
// print to our byte array output stream
PrintWriter pw = new PrintWriter(new OutputStreamWriter(out, StandardCharsets.UTF_8));
pw.print("{");
Iterator<String> i = document.getFields();
boolean needComma = false;
while (i.hasNext()) {
String fieldName = i.next();
String[] fieldValues = document.getFieldAsStrings(fieldName);
needComma = writeField(pw, needComma, fieldName, fieldValues);
}
needComma = writeACLs(pw, needComma, "document", acls, denyAcls);
needComma = writeACLs(pw, needComma, "share", shareAcls, shareDenyAcls);
needComma = writeACLs(pw, needComma, "parent", parentAcls, parentDenyAcls);
if (inputStream != null) {
if (needComma) {
pw.print(",");
}
// I'm told this is not necessary: see CONNECTORS-690
//pw.print("\"type\" : \"attachment\",");
pw.print("\"file\" : {");
String contentType = document.getMimeType();
if (contentType != null) {
pw.print("\"_content_type\" : " + jsonStringEscape(contentType) + ",");
}
String fileName = document.getFileName();
if (fileName != null) {
pw.print("\"_name\" : " + jsonStringEscape(fileName) + ",");
}
// Since ES 1.0
pw.print(" \"_content\" : \"");
Base64 base64 = new Base64();
base64.encodeStream(inputStream, pw);
pw.print("\"}");
}
pw.print("}");
pw.flush();
IOUtils.closeQuietly(pw);
finalString = new String(((ByteArrayOutputStream) out).toByteArray(), StandardCharsets.UTF_8);
//System.out.println("FINAL: " + finalString);
} catch (Exception e) {
e.printStackTrace();
// throw new IOException(e.getMessage());
}
return ((ByteArrayOutputStream) out).toByteArray();
}
protected static boolean writeField(PrintWriter pw, boolean needComma,
String fieldName, String[] fieldValues)
throws IOException {
if (fieldValues == null) {
return needComma;
}
if (fieldValues.length == 1) {
if (needComma) {
pw.print(",");
}
pw.print(jsonStringEscape(fieldName) + " : " + jsonStringEscape(fieldValues[0]));
needComma = true;
return needComma;
}
if (fieldValues.length > 1) {
if (needComma) {
pw.print(",");
}
StringBuilder sb = new StringBuilder();
sb.append("[");
for (int j = 0; j < fieldValues.length; j++) {
sb.append(jsonStringEscape(fieldValues[j])).append(",");
}
sb.setLength(sb.length() - 1); // discard last ","
sb.append("]");
pw.print(jsonStringEscape(fieldName) + " : " + sb.toString());
needComma = true;
}
return needComma;
}
/**
* Output an acl level
*/
protected static boolean writeACLs(PrintWriter pw, boolean needComma,
String aclType, String[] acl, String[] denyAcl)
throws IOException {
String metadataACLName = allowAttributeName + aclType;
if (acl != null && acl.length > 0) {
needComma = writeField(pw, needComma, metadataACLName, acl);
} else if (!useNullValue) {
needComma = writeField(pw, needComma, metadataACLName, new String[]{noSecurityToken});
}
String metadataDenyACLName = denyAttributeName + aclType;
if (denyAcl != null && denyAcl.length > 0) {
needComma = writeField(pw, needComma, metadataDenyACLName, denyAcl);
} else if (!useNullValue) {
needComma = writeField(pw, needComma, metadataDenyACLName, new String[]{noSecurityToken});
}
return needComma;
}
protected static String jsonStringEscape(String value) {
StringBuilder sb = new StringBuilder("\"");
for (int i = 0; i < value.length(); i++) {
char x = value.charAt(i);
if (x == '\n') {
sb.append('\\').append('n');
} else if (x == '\r') {
sb.append('\\').append('r');
} else if (x == '\t') {
sb.append('\\').append('t');
} else if (x == '\b') {
sb.append('\\').append('b');
} else if (x == '\f') {
sb.append('\\').append('f');
} else {
if (x == '\"' || x == '\\' || x == '/') {
sb.append('\\');
}
sb.append(x);
}
}
sb.append("\"");
return sb.toString();
}
}