add digester in a utility project

PR: MRM-9


git-svn-id: https://svn.apache.org/repos/asf/maven/repository-manager/trunk@360471 13f79535-47bb-0310-9956-ffa450edef68

maven-repository-utils/pom.xml

@@ -0,0 +1,33 @@
+<!--
+  ~ Copyright 2005-2006 The Apache Software Foundation.
+  ~
+  ~ Licensed 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.
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <parent>
+    <groupId>org.apache.maven.repository</groupId>
+    <artifactId>maven-repository-manager</artifactId>
+    <version>1.0-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>maven-repository-utils</artifactId>
+  <name>Maven Repository Utilities</name>
+  <dependencies>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-utils</artifactId>
+    </dependency>
+  </dependencies>
+</project>

maven-repository-utils/src/main/java/org/apache/maven/repository/digest/DefaultDigester.java

@@ -0,0 +1,107 @@
+package org.apache.maven.repository.digest;
+
+import org.codehaus.plexus.util.IOUtil;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/*
+ * Copyright 2005-2006 The Apache Software Foundation.
+ *
+ * Licensed 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.
+ */
+
+/**
+ * Create a digest for a file.
+ *
+ * @author <a href="mailto:brett@apache.org">Brett Porter</a>
+ * @plexus.component role="org.apache.maven.repository.digest.Digester"
+ */
+public class DefaultDigester
+    implements Digester
+{
+    private static final int CHECKSUM_BUFFER_SIZE = 16384;
+
+    private static final int BYTE_MASK = 0xFF;
+
+    public String createChecksum( File file, String algorithm )
+        throws IOException, NoSuchAlgorithmException
+    {
+        MessageDigest digest = MessageDigest.getInstance( algorithm );
+
+        InputStream fis = new FileInputStream( file );
+        try
+        {
+            byte[] buffer = new byte[CHECKSUM_BUFFER_SIZE];
+            int numRead;
+            do
+            {
+                numRead = fis.read( buffer );
+                if ( numRead > 0 )
+                {
+                    digest.update( buffer, 0, numRead );
+                }
+            }
+            while ( numRead != -1 );
+        }
+        finally
+        {
+            IOUtil.close( fis );
+        }
+
+        return byteArrayToHexStr( digest.digest() );
+    }
+
+    public boolean verifyChecksum( File file, String checksum, String algorithm )
+        throws NoSuchAlgorithmException, IOException
+    {
+        //Create checksum for jar file
+        String sum = createChecksum( file, algorithm );
+        return checksum.toUpperCase().equals( sum.toUpperCase() );
+    }
+
+    /**
+     * Convert an incoming array of bytes into a string that represents each of
+     * the bytes as two hex characters.
+     *
+     * @param data
+     */
+    private static String byteArrayToHexStr( byte[] data )
+    {
+        String output = "";
+
+        for ( int cnt = 0; cnt < data.length; cnt++ )
+        {
+            //Deposit a byte into the 8 lsb of an int.
+            int tempInt = data[cnt] & BYTE_MASK;
+
+            //Get hex representation of the int as a string.
+            String tempStr = Integer.toHexString( tempInt );
+
+            //Append a leading 0 if necessary so that each hex string will contain 2 characters.
+            if ( tempStr.length() == 1 )
+            {
+                tempStr = "0" + tempStr;
+            }
+
+            //Concatenate the two characters to the output string.
+            output = output + tempStr;
+        }
+
+        return output.toUpperCase();
+    }
+}

maven-repository-utils/src/main/java/org/apache/maven/repository/digest/Digester.java

@@ -0,0 +1,42 @@
+package org.apache.maven.repository.digest;
+
+/*
+ * Copyright 2005-2006 The Apache Software Foundation.
+ *
+ * Licensed 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.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.io.FileNotFoundException;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * Create a digest for a file.
+ *
+ * @author <a href="mailto:brett@apache.org">Brett Porter</a>
+ */
+public interface Digester
+{
+    String ROLE = Digester.class.getName();
+
+    String SHA1 = "SHA-1";
+
+    String MD5 = "MD5";
+
+    String createChecksum( File file, String algorithm )
+        throws FileNotFoundException, IOException, NoSuchAlgorithmException;
+
+    boolean verifyChecksum( File file, String checksum, String algorithm )
+        throws NoSuchAlgorithmException, IOException;
+}