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Renders gadgets, provides the gadget metadata service, and serves all javascript required by the OpenSocial specification.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to you 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.apache.shindig.gadgets.oauth2.handler;

import org.apache.shindig.gadgets.http.HttpRequest;
import org.apache.shindig.gadgets.oauth2.OAuth2Accessor;
import org.apache.shindig.gadgets.oauth2.OAuth2Error;
import org.apache.shindig.gadgets.oauth2.OAuth2Message;

/**
 * 
 * See {@link ClientAuthenticationHandler}
 * 
 * Handler for Basic Authentication
 * 
 */
public class StandardAuthenticationHandler implements ClientAuthenticationHandler {
  private static final OAuth2Error ERROR = OAuth2Error.AUTHENTICATION_PROBLEM;

  public StandardAuthenticationHandler() {
  }

  public OAuth2HandlerError addOAuth2Authentication(final HttpRequest request,
      final OAuth2Accessor accessor) {
    try {
      if (request == null) {
        return StandardAuthenticationHandler.getError("request is null");
      }

      if (accessor == null) {
        return StandardAuthenticationHandler.getError("accessor is null");
      }

      if (!accessor.isValid() || accessor.isErrorResponse()) {
        return StandardAuthenticationHandler.getError("accessor is invalid");
      }

      final String clientId = accessor.getClientId();

      if (clientId == null) {
        return StandardAuthenticationHandler.getError("client_id is null");
      }

      final byte[] secretBytes = accessor.getClientSecret();

      if (secretBytes == null) {
        return StandardAuthenticationHandler.getError("client_secret is secret");
      }

      final String secret = new String(secretBytes, "UTF-8");

      request.setHeader(OAuth2Message.CLIENT_ID, clientId);
      request.setParam(OAuth2Message.CLIENT_ID, clientId);
      request.setHeader(OAuth2Message.CLIENT_SECRET, secret);
      request.setParam(OAuth2Message.CLIENT_SECRET, secret);

      return null;
    } catch (final Exception e) {
      return StandardAuthenticationHandler.getError("Exception adding standard auth headers", e);
    }
  }

  public String geClientAuthenticationType() {
    return OAuth2Message.STANDARD_AUTH_TYPE;
  }

  private static OAuth2HandlerError getError(final String contextMessage) {
    return StandardAuthenticationHandler.getError(contextMessage, null);
  }

  private static OAuth2HandlerError getError(final String contextMessage, final Exception e) {
    return new OAuth2HandlerError(StandardAuthenticationHandler.ERROR, contextMessage, e);
  }
}