org.springframework.social.cloudplaylists.api.impl.CloudPlaylistsErrorHandler.java Source code

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Here is the source code for org.springframework.social.cloudplaylists.api.impl.CloudPlaylistsErrorHandler.java

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/*
 * Copyright 2011 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.social.cloudplaylists.api.impl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.social.ExpiredAuthorizationException;
import org.springframework.social.InternalServerErrorException;
import org.springframework.social.NotAuthorizedException;
import org.springframework.social.OperationNotPermittedException;
import org.springframework.social.ResourceNotFoundException;
import org.springframework.social.ServerDownException;
import org.springframework.social.UncategorizedApiException;
import org.springframework.social.connect.NotConnectedException;
import org.springframework.web.client.DefaultResponseErrorHandler;

import com.cloudplaylists.exceptions.PlaylistCreationException;
import com.cloudplaylists.exceptions.PlaylistUpdateException;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Subclass of {@link DefaultResponseErrorHandler} that handles errors from
 * CloudPlaylists API, interpreting them into appropriate exceptions.
 * 
 * @author Michael Lavelle
 */
class CloudPlaylistsErrorHandler extends DefaultResponseErrorHandler {

    private void handleUncategorizedError(ClientHttpResponse response, Map errorDetails) {
        try {
            super.handleError(response);
        } catch (Exception e) {
            if (errorDetails != null && errorDetails.get("error_description") != null) {
                String m = (String) errorDetails.get("error_description");
                throw new UncategorizedApiException("cloudplaylists", m, e);
            } else {
                throw new UncategorizedApiException("cloudplaylists", "No error details from CloudPlaylists", e);
            }
        }
    }

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {

        Map errorDetails = extractErrorDetailsFromResponse(response);
        handleCloudPlaylistsError(response.getStatusCode(), errorDetails);
        handleUncategorizedError(response, errorDetails);
    }

    @Override
    public boolean hasError(ClientHttpResponse response) throws IOException {

        if (super.hasError(response)) {
            return true;
        }
        return false;
    }

    void handleCloudPlaylistsError(HttpStatus statusCode, Map errorDetails) {

        String message = (String) errorDetails.get("error_description");
        HttpStatus httpStatus = statusCode;

        if (httpStatus == HttpStatus.OK) {
            // Should never happen
        } else if (httpStatus == HttpStatus.BAD_REQUEST) {

            String error = (String) errorDetails.get("error");
            String error_description = (String) errorDetails.get("error_description");

            if (error != null && PlaylistUpdateException.class.getName().equals(error)) {
                throw new PlaylistUpdateException(error_description);
            }
            if (error != null && PlaylistCreationException.class.getName().equals(error)) {
                throw new PlaylistCreationException(error_description);
            }

            throw new ResourceNotFoundException("cloudplaylists", message);

        } else if (httpStatus == HttpStatus.NOT_FOUND) {
            throw new ResourceNotFoundException("cloudplaylists", message);

        } else if (httpStatus == HttpStatus.UNAUTHORIZED) {

            throw new NotAuthorizedException("cloudplaylists", message);
        } else if (httpStatus == HttpStatus.FORBIDDEN) {
            String provider = (String) errorDetails.get("provider");
            String error = (String) errorDetails.get("error");
            if (error != null && provider != null && NotConnectedException.class.getName().equals(error)) {
                throw new NotConnectedException(provider);
            }
            if (error != null && provider != null && ExpiredAuthorizationException.class.getName().equals(error)) {
                throw new ExpiredAuthorizationException(provider);
            }
            throw new OperationNotPermittedException("cloudplaylists", message);
        } else if (httpStatus == HttpStatus.INTERNAL_SERVER_ERROR) {
            throw new InternalServerErrorException("cloudplaylists", message);
        } else if (httpStatus == HttpStatus.SERVICE_UNAVAILABLE) {
            throw new ServerDownException("cloudplaylists", message);
        }
    }

    /*
     * Attempts to extract ExFm error details from the response. Returns null if
     * the response doesn't match the expected JSON error response.
     */
    @SuppressWarnings("rawtypes")
    private Map extractErrorDetailsFromResponse(ClientHttpResponse response) throws IOException {

        ObjectMapper mapper = new ObjectMapper(new JsonFactory());
        try {
            String json = readFully(response.getBody());
            HashMap errorDetails = mapper.readValue(json, HashMap.class);
            return errorDetails;
        } catch (JsonParseException e) {
            return null;
        }
    }

    private String readFully(InputStream in) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder sb = new StringBuilder();
        while (reader.ready()) {
            sb.append(reader.readLine());
        }
        return sb.toString();
    }

}