1 files changed, 116 insertions, 0 deletions
diff --git a/stubs/org.eclipse.mylyn.commons.identity/src/org/eclipse/mylyn/internal/commons/identity/gravatar/GravatarUtils.java b/stubs/org.eclipse.mylyn.commons.identity/src/org/eclipse/mylyn/internal/commons/identity/gravatar/GravatarUtils.java
new file mode 100644
index 00000000..c6d0f4b3
--- /dev/null
+++ b/stubs/org.eclipse.mylyn.commons.identity/src/org/eclipse/mylyn/internal/commons/identity/gravatar/GravatarUtils.java
@@ -0,0 +1,116 @@
+/*******************************************************************************
+ *  Copyright (c) 2011 GitHub Inc. and others
+ *  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
+ *    Tasktop Technologies - improvements
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.commons.identity.gravatar;
+
+import java.io.UnsupportedEncodingException;
+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;
+		} catch (UnsupportedEncodingException 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;
+	}
+
+	public static boolean isValidEmail(String alias) {
+		return alias != null && alias.contains("@");
+	}
+
+}