Merge branch 'develop' into stable

src/main/java/com/inteligr8/rs/ClientConfiguration.java

@@ -29,6 +29,20 @@ public interface ClientConfiguration {
 		return null;
 	}
 	
+	/**
+	 * @return The client ID for Client Enforcement authentication.
+	 */
+	default String getClientId() {
+		return null;
+	}
+
+	/**
+	 * @return The corresponding client secret for the client ID in Client Enforcement authentication.
+	 */
+	default String getClientSecret() {
+		return null;
+	}
+	
 	/**
 	 * @return The token for BEARER authorization.
 	 */
@@ -47,14 +61,14 @@ public interface ClientConfiguration {
 	 * @return The client ID provided by the OAuth IdP administrator.
 	 */
 	default String getOAuthClientId() {
-		return null;
+		return this.getClientId();
 	}
 
 	/**
 	 * @return The corresponding client secret for the client ID provided by the OAuth IdP administrator.
 	 */
 	default String getOAuthClientSecret() {
-		return null;
+		return this.getClientSecret();
 	}
 	
 	/**
@@ -115,6 +129,8 @@ public interface ClientConfiguration {
 				return new OAuthClientCredentialAuthorizationFilter(this.getOAuthTokenUrl(),
 						this.getOAuthClientId(), this.getOAuthClientSecret());
 			}
+		} else if (this.getClientId() != null) {
+			return new ClientEnforcementAuthorizationFilter(this.getClientId(), this.getClientSecret());
 		} else if (this.getBasicAuthUsername() != null) {
 			return new BasicAuthorizationFilter(this.getBasicAuthUsername(), this.getBasicAuthPassword());
 		} else {

src/main/java/com/inteligr8/rs/ClientEnforcementAuthorizationFilter.java

@@ -0,0 +1,49 @@
+package com.inteligr8.rs;
+
+import javax.ws.rs.client.ClientRequestContext;
+
+/**
+ * This class is the base for implementations of client authorization similar
+ * to OAuth-based flows.
+ *  
+ * @author brian@inteligr8.com
+ */
+public class ClientEnforcementAuthorizationFilter implements AuthorizationFilter {
+	
+	private final String clientId;
+	private final String clientSecret;
+	
+	/**
+	 * This constructor creates a client authorization filter using a client ID
+	 * registered with the endpoint.
+	 * 
+	 * @param clientId An endpoint provided client ID.
+	 */
+	public ClientEnforcementAuthorizationFilter(String clientId) {
+		this(clientId, null);
+	}
+
+	/**
+	 * This constructor creates a client authorization filter using a client ID
+	 * registered with the endpoint, and the corresponding client secret.
+	 * 
+	 * @param clientId An endpoint provided client ID.
+	 * @param clientSecret A secret corresponding to the client ID.
+	 */
+	public ClientEnforcementAuthorizationFilter(String clientId, String clientSecret) {
+		this.clientId = clientId;
+		this.clientSecret = clientSecret;
+	}
+
+	/**
+	 * This method applies the client headers to the {@link ClientRequestContext}.
+	 * 
+	 * @param requestContext A request context.
+	 */
+	@Override
+	public void filter(ClientRequestContext requestContext) {
+		requestContext.getHeaders().add("client_id", this.clientId);
+		requestContext.getHeaders().add("client_secret", this.clientSecret);
+	}
+
+}