Move OAuth2AuthenticationException to oauth2-core

Fixes gh-4707

oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/OAuth2AuthenticationException.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * 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.
+ */
+package org.springframework.security.oauth2.core;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.util.Assert;
+
+/**
+ * This exception is thrown for all <i>OAuth 2.0</i> related {@link Authentication} errors.
+ *
+ * <p>
+ * There are a number of scenarios where an error may occur, for example:
+ * <ul>
+ *  <li>The authorization request or token request is missing a required parameter</li>
+ *	<li>Missing or invalid client identifier</li>
+ *	<li>Invalid or mismatching redirection URI</li>
+ *	<li>The requested scope is invalid, unknown, or malformed</li>
+ *	<li>The resource owner or authorization server denied the access request</li>
+ *	<li>Client authentication failed</li>
+ *	<li>The provided authorization grant (authorization code, resource owner credentials) is invalid, expired, or revoked</li>
+ * </ul>
+ *
+ * @author Joe Grandja
+ * @since 5.0
+ */
+public class OAuth2AuthenticationException extends AuthenticationException {
+	private OAuth2Error error;
+
+	public OAuth2AuthenticationException(OAuth2Error error, Throwable cause) {
+		this(error, cause.getMessage(), cause);
+	}
+
+	public OAuth2AuthenticationException(OAuth2Error error, String message) {
+		super(message);
+		this.setError(error);
+	}
+
+	public OAuth2AuthenticationException(OAuth2Error error, String message, Throwable cause) {
+		super(message, cause);
+		this.setError(error);
+	}
+
+	public OAuth2Error getError() {
+		return this.error;
+	}
+
+	private void setError(OAuth2Error error) {
+		Assert.notNull(error, "error cannot be null");
+		this.error = error;
+	}
+}