Feature: Authorization support

examples/auth-example/README.md

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+# MCP Authentication Example
+
+This example demonstrates how to implement OAuth 2.0 authentication with the Model Context Protocol (MCP) Java SDK.
+
+## Overview
+
+The example consists of:
+
+1. A simple MCP server with OAuth authentication
+2. A simple MCP client that authenticates using OAuth
+3. A tool that requires authentication to access
+
+## Running the Example
+
+### 1. Build the Project
+
+```bash
+cd examples/auth-example
+mvn clean package
+```
+
+### 2. Run the Server
+
+In one terminal window:
+
+```bash
+cd examples/auth-example
+mvn exec:java -Dexec.mainClass="io.modelcontextprotocol.examples.auth.server.SimpleAuthServer"
+```
+
+### 3. Run the Client
+
+In another terminal window:
+
+```bash
+cd examples/auth-example
+mvn exec:java -Dexec.mainClass="io.modelcontextprotocol.examples.auth.client.SimpleAuthClient"
+```
+
+## Using the Client
+
+Once the client is running, you can use these commands:
+- `list` - List available tools
+- `call get_user_profile` - Call the user profile tool
+- `quit` - Exit the client
+
+## Authentication Flow
+
+1. Client initiates the OAuth flow
+2. Server redirects to the authorization page
+3. User approves the authorization
+4. Server redirects back to the client with an authorization code
+5. Client exchanges the code for access and refresh tokens
+6. Client uses the access token for authenticated MCP requests
+
+## Implementation Details
+
+### Server
+
+The server implements the `OAuthAuthorizationServerProvider` interface to provide OAuth authentication. It uses in-memory storage for clients, tokens, and authorization codes.
+
+### Client
+
+The client uses the `OAuthClientProvider` class to handle OAuth authentication. It opens a browser for the authorization flow and starts a local server to receive the OAuth callback.
+
+## Code Structure
+
+- `SimpleAuthServer.java` - Server implementation
+- `SimpleAuthClient.java` - Client implementation
+- `Constants.java` - Shared constants

examples/auth-example/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>io.modelcontextprotocol.sdk</groupId>
+        <artifactId>mcp-parent</artifactId>
+        <version>0.11.0-SNAPSHOT</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>auth-example</artifactId>
+    <name>MCP Auth Example</name>
+    <description>Example of MCP authentication using OAuth 2.0</description>
+
+    <dependencies>
+        <!-- MCP SDK -->
+        <dependency>
+            <groupId>io.modelcontextprotocol.sdk</groupId>
+            <artifactId>mcp</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <!-- Spring Web for HTTP server -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>3.2.3</version>
+        </dependency>
+
+        <!-- Logging -->
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <cleanupDaemonThreads>false</cleanupDaemonThreads>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>3.2.3</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

examples/auth-example/run-client.sh

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+#!/bin/bash
+cd "$(dirname "$0")"
+mvn exec:java -Dexec.mainClass="io.modelcontextprotocol.examples.auth.client.SimpleAuthClient"

examples/auth-example/run-server.sh

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+#!/bin/bash
+cd "$(dirname "$0")"
+mvn exec:java -Dexec.mainClass="io.modelcontextprotocol.examples.auth.server.SimpleAuthServer"