Attachment #193926 for bug #343602

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/*******************************************************************************
 *  Copyright (c) 2011 GitHub Inc.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.commons.identity.gravatar;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Locale;

import org.eclipse.core.runtime.IAdaptable;

/**
 * Gravatar utililites.
 * 
 * @author Kevin Sawicki (kevin@github.com)
 */
public abstract class GravatarUtils {

	private static String digest(String value) {
		String hashed = null;
		try {
			byte[] input = value.getBytes(IGravatarConstants.CHARSET);
			byte[] digested = MessageDigest.getInstance(IGravatarConstants.HASH_ALGORITHM).digest(input);
			hashed = new BigInteger(1, digested).toString(16);
			int padding = IGravatarConstants.HASH_LENGTH - hashed.length();
			if (padding > 0) {
				char[] zeros = new char[padding];
				Arrays.fill(zeros, '0');
				hashed = new String(zeros) + hashed;
			}
		} catch (NoSuchAlgorithmException e) {
			hashed = null;
		}
		return hashed;
	}

	/**
	 * Get hash for object by attempting to adapt it to an {@link IGravatarHashProvider} and fall back on
	 * {@link Object#toString()} value if adaptation fails and {@link Object#toString()} is or can be transformed into a
	 * valid hash.
	 * 
	 * @param element
	 * @return hash
	 */
	public String getAdaptedHash(Object element) {
		if (element == null) {
			return null;
		}

		String hash = null;
		IGravatarHashProvider provider = null;
		if (element instanceof IGravatarHashProvider) {
			provider = (IGravatarHashProvider) element;
		} else if (element instanceof IAdaptable) {
			provider = (IGravatarHashProvider) ((IAdaptable) element).getAdapter(IGravatarHashProvider.class);
		}
		if (provider != null) {
			hash = provider.getGravatarHash();
		} else {
			String potentialHash = element.toString();
			if (isValidHash(potentialHash)) {
				hash = potentialHash;
			} else {
				hash = getHash(potentialHash);
			}
		}
		return hash;
	}

	/**
	 * Is the specified string a valid graavatar hash?
	 * 
	 * @param hash
	 * @return true if valid hash, false otherwise
	 */
	public static boolean isValidHash(String hash) {
		return hash != null && hash.length() == IGravatarConstants.HASH_LENGTH
				&& IGravatarConstants.HASH_PATTERN.matcher(hash).matches();
	}

	/**
	 * Get gravatar hash for specified e-mail address
	 * 
	 * @param email
	 * @return hash
	 */
	public static String getHash(String email) {
		String hash = null;
		if (email != null) {
			email = email.trim().toLowerCase(Locale.US);
			if (email.length() > 0) {
				hash = digest(email);
			}
		}
		return hash;
	}

}




/*******************************************************************************
 *  Copyright (c) 2011 GitHub Inc.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.commons.identity.gravatar;

import java.nio.charset.Charset;
import java.util.regex.Pattern;

/**
 * Gravatar constants.
 * 
 * @author Kevin Sawicki (kevin@github.com)
 */
public interface IGravatarConstants {

	/**
	 * URL
	 */
	String URL = "http://www.gravatar.com/avatar/"; //$NON-NLS-1$

	/**
	 * HASH_REGEX
	 */
	String HASH_REGEX = "[0-9a-f]{32}"; //$NON-NLS-1$

	/**
	 * HASH_PATTERN
	 */
	Pattern HASH_PATTERN = Pattern.compile(HASH_REGEX);

	/**
	 * HASH_LENGTH
	 */
	int HASH_LENGTH = 32;

	/**
	 * HASH_ALGORITHM
	 */
	String HASH_ALGORITHM = "MD5"; //$NON-NLS-1$

	/**
	 * Charset used for hashing
	 */
	Charset CHARSET = Charset.forName("CP1252"); //$NON-NLS-1$

}

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(-)src/org/eclipse/mylyn/commons/identity/gravatar/GravatarUtils.java (+108 lines)
1	/*******************************************************************************
2	* Copyright (c) 2011 GitHub Inc.
3	* All rights reserved. This program and the accompanying materials
4	* are made available under the terms of the Eclipse Public License v1.0
5	* which accompanies this distribution, and is available at
6	* http://www.eclipse.org/legal/epl-v10.html
7	*
8	* Contributors:
9	* Kevin Sawicki (GitHub Inc.) - initial API and implementation
10	*******************************************************************************/
11
12	package org.eclipse.mylyn.commons.identity.gravatar;
13
14	import java.math.BigInteger;
15	import java.security.MessageDigest;
16	import java.security.NoSuchAlgorithmException;
17	import java.util.Arrays;
18	import java.util.Locale;
19
20	import org.eclipse.core.runtime.IAdaptable;
21
22	/**
23	* Gravatar utililites.
24	*
25	* @author Kevin Sawicki (kevin@github.com)
26	*/
27	public abstract class GravatarUtils {
28
29	private static String digest(String value) {
30	String hashed = null;
31	try {
32	byte[] input = value.getBytes(IGravatarConstants.CHARSET);
33	byte[] digested = MessageDigest.getInstance(IGravatarConstants.HASH_ALGORITHM).digest(input);
34	hashed = new BigInteger(1, digested).toString(16);
35	int padding = IGravatarConstants.HASH_LENGTH - hashed.length();
36	if (padding > 0) {
37	char[] zeros = new char[padding];
38	Arrays.fill(zeros, '0');
39	hashed = new String(zeros) + hashed;
40	}
41	} catch (NoSuchAlgorithmException e) {
42	hashed = null;
43	}
44	return hashed;
45	}
46
47	/**
48	* Get hash for object by attempting to adapt it to an {@link IGravatarHashProvider} and fall back on
49	* {@link Object#toString()} value if adaptation fails and {@link Object#toString()} is or can be transformed into a
50	* valid hash.
51	*
52	* @param element
53	* @return hash
54	*/
55	public String getAdaptedHash(Object element) {
56	if (element == null) {
57	return null;
58	}
59
60	String hash = null;
61	IGravatarHashProvider provider = null;
62	if (element instanceof IGravatarHashProvider) {
63	provider = (IGravatarHashProvider) element;
64	} else if (element instanceof IAdaptable) {
65	provider = (IGravatarHashProvider) ((IAdaptable) element).getAdapter(IGravatarHashProvider.class);
66	}
67	if (provider != null) {
68	hash = provider.getGravatarHash();
69	} else {
70	String potentialHash = element.toString();
71	if (isValidHash(potentialHash)) {
72	hash = potentialHash;
73	} else {
74	hash = getHash(potentialHash);
75	}
76	}
77	return hash;
78	}
79
80	/**
81	* Is the specified string a valid graavatar hash?
82	*
83	* @param hash
84	* @return true if valid hash, false otherwise
85	*/
86	public static boolean isValidHash(String hash) {
87	return hash != null && hash.length() == IGravatarConstants.HASH_LENGTH
88	&& IGravatarConstants.HASH_PATTERN.matcher(hash).matches();
89	}
90
91	/**
92	* Get gravatar hash for specified e-mail address
93	*
94	* @param email
95	* @return hash
96	*/
97	public static String getHash(String email) {
98	String hash = null;
99	if (email != null) {
100	email = email.trim().toLowerCase(Locale.US);
101	if (email.length() > 0) {
102	hash = digest(email);
103	}
104	}
105	return hash;
106	}
107
108	}