[ELY-1724] Develop an alternative to 'org.wildfly.security.credential.source.OAuth2CredentialSource'

credential/source/oauth2/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ JBoss, Home of Professional Open Source.
+  ~ Copyright 2018 Red Hat, Inc., and individual contributors
+  ~ as indicated by the @author tags.
+  ~
+  ~ 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/xsd/maven-4.0.0.xsd">
+
+    <parent>
+        <groupId>org.wildfly.security</groupId>
+        <artifactId>wildfly-elytron-parent</artifactId>
+        <version>2.0.0.Alpha7-SNAPSHOT</version>
+        <relativePath>../../../pom.xml</relativePath>
+    </parent>
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>wildfly-elytron-credential-source-oauth2</artifactId>
+
+    <name>WildFly Elytron - Credential Source Implementation</name>
+    <description>WildFly Security Credential Source Implementation</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jboss.logging</groupId>
+            <artifactId>jboss-logging-annotations</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jboss.logging</groupId>
+            <artifactId>jboss-logging</artifactId>
+            <scope>provided</scope>
+        </dependency>        
+        <dependency>
+            <groupId>org.jboss.logging</groupId>
+            <artifactId>jboss-logging-processor</artifactId>
+            <scope>provided</scope>
+        </dependency>  
+
+        <dependency>
+            <groupId>org.wildfly.common</groupId>
+            <artifactId>wildfly-common</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.wildfly.security</groupId>
+            <artifactId>wildfly-elytron-mechanism</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.json</groupId>
+            <artifactId>jakarta.json-api</artifactId>
+            <version>1.1.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.wildfly.security</groupId>
+            <artifactId>wildfly-elytron-client</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

credential/source/oauth2/src/main/java/org/wildfly/security/credential/source/oauth2/ElytronMessages.java

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+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2014 Red Hat, Inc., and individual contributors
+ * as indicated by the @author tags.
+ *
+ * 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.wildfly.security.credential.source.oauth2;
+
+import org.jboss.logging.BasicLogger;
+import org.jboss.logging.Logger;
+import org.jboss.logging.annotations.Cause;
+import org.jboss.logging.annotations.Message;
+import org.jboss.logging.annotations.MessageLogger;
+import org.jboss.logging.annotations.ValidIdRange;
+import org.jboss.logging.annotations.ValidIdRanges;
+import org.wildfly.security.mechanism.AuthenticationMechanismException;
+
+/**
+ * Log messages and exceptions for Elytron.
+ *
+ * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
+ * @author <a href="mailto:darran.lofthouse@jboss.com">Darran Lofthouse</a>
+ */
+@MessageLogger(projectCode = "ELY", length = 5)
+@ValidIdRanges({
+    @ValidIdRange(min = 1106, max = 1106),
+    @ValidIdRange(min = 5053, max = 5053),
+    @ValidIdRange(min = 5125, max = 5125),
+    @ValidIdRange(min = 9001, max = 9001)
+})
+interface ElytronMessages extends BasicLogger {
+
+    ElytronMessages saslOAuth2 = Logger.getMessageLogger(ElytronMessages.class, "org.wildfly.security.sasl.oauth2");
+
+    @Message(id = 1106, value = "Could not obtain SSLContext")
+    IllegalStateException failedToObtainSSLContext(@Cause Throwable cause);
+
+    @Message(id = 5053, value = "Callback handler failed for unknown reason")
+    AuthenticationMechanismException mechCallbackHandlerFailedForUnknownReason(@Cause Throwable cause);
+
+    @Message(id = 5125, value = "Unable to handle response from server")
+    AuthenticationMechanismException mechUnableToHandleResponseFromServer(@Cause Throwable cause);
+
+    @Message(id = 9001, value = "Client credentials not provided")
+    IllegalStateException oauth2ClientCredentialsNotProvided();
+}