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Client library to use the IBM Watson Services and AlchemyAPI
/**
* Copyright 2015 IBM Corp. All Rights Reserved.
*
* 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 com.ibm.watson.developer_cloud.service;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.json.JSONObject;
import com.google.gson.Gson;
import com.ibm.watson.developer_cloud.util.MediaType;
import com.ibm.watson.developer_cloud.util.ResponseUtil;
/**
* Watson service abstract common functionality of various Watson Services. It
* handle authentication and default url
*
* @author German Attanasio Ruiz
* @see
* IBM Watson Developer Cloud
*/
public abstract class WatsonService {
private static final Logger log = Logger.getLogger(WatsonService.class
.getName());
/**
* Field ACCEPT. (value is ""Accept"")
*/
private static final String ACCEPT = "Accept";
/**
* Field AUTHORIZATION. (value is ""Authorization"")
*/
private static final String AUTHORIZATION = "Authorization";
/**
* Field CONNECTION_TIMEOUT. (value is 20000)
*/
private static final int CONNECTION_TIMEOUT = 20000;
/**
* Field MAX_TOTAL_CONNECTIONS. (value is 10)
*/
private static final int MAX_TOTAL_CONNECTIONS = 10;
/**
* Field httpClient.
*/
private HttpClient httpClient;
/**
* Field gson.
*/
private Gson gson = new Gson();
/**
* Field apiKey.
*/
private String apiKey;
/**
* Field endPoint.
*/
private String endPoint;
/**
* Instantiates a new Watson service.
*
*/
public WatsonService() {
}
/**
* Builds the request URI appending the service end point to the path.
* From: /v1/foo/bar
* to:https://host:port/api/v1/foo/bar
*
* @param request
* the http request
*
* @return the URI including the service end point
*/
private URI buildRequestURI(HttpRequestBase request) {
String requestURL = getEndPoint() + request.getURI();
try {
requestURL = getEndPoint() + request.getURI();
return new URI(requestURL);
} catch (URISyntaxException e) {
log.log(Level.SEVERE, requestURL
+ " could not be parsed as a URI reference");
throw new RuntimeException(e);
}
}
/**
* Execute the Http request.
*
* @param request
* the http request
*
* @return the http response
*/
protected HttpResponse execute(HttpRequestBase request) {
if (getApiKey() == null)
throw new IllegalArgumentException(
"apiKey or username and password were not specified");
else {
request.addHeader(AUTHORIZATION,
apiKey.startsWith("Basic ") ? apiKey : "Basic " + apiKey);
}
if (getEndPoint() == null)
throw new IllegalArgumentException(
"service endpoint was not specified");
if (!request.containsHeader(ACCEPT)) {
request.addHeader(ACCEPT, getDefaultContentType());
}
// from /v1/foo/bar to https://host:port/api/v1/foo/bar
if (!request.getURI().isAbsolute()) {
request.setURI(buildRequestURI(request));
}
HttpResponse response;
log.log(Level.FINEST, "Request to: " + request.getURI());
try {
response = getHttpClient().execute(request);
} catch (ClientProtocolException e) {
log.log(Level.SEVERE, "ClientProtocolException", e);
throw new RuntimeException(e);
} catch (IOException e) {
log.log(Level.SEVERE, "IOException", e);
throw new RuntimeException(e);
}
final int status = response.getStatusLine().getStatusCode();
log.log(Level.FINEST, "Response HTTP Status: " + status);
if (status >= 200 && status < 300)
return response;
// There was a Client Error 4xx or a Server Error 5xx
// Get the error message and create the exception
String error = getErrorMessage(response);
log.log(Level.SEVERE, "Error message from service:" + error);
switch (status) {
case HttpStatus.SC_BAD_REQUEST: // HTTP 400
throw new BadRequestException(error != null ? error : "Bad Request");
case HttpStatus.SC_UNAUTHORIZED: // HTTP 401
throw new UnauthorizedException(
"Unauthorized: Access is denied due to invalid credentials");
case HttpStatus.SC_FORBIDDEN: // HTTP 403
throw new ForbiddenException(error != null ? error
: "Forbidden: Service refuse the request");
case HttpStatus.SC_NOT_FOUND: // HTTP 404
throw new NotFoundException(error != null ? error : "Not found");
case HttpStatus.SC_NOT_ACCEPTABLE: // HTTP 406
throw new ForbiddenException(error != null ? error
: "Forbidden: Service refuse the request");
case HttpStatus.SC_REQUEST_TOO_LONG: // HTTP 413
throw new RequestTooLargeException(
error != null ? error
: "Request too large: The request entity is larger than the server is able to process");
case HttpStatus.SC_UNSUPPORTED_MEDIA_TYPE: // HTTP 415
throw new UnsupportedException(
error != null ? error
: "Unsupported MIME type: The request entity has a media type which the server or resource does not support");
case 429: // HTTP 429
throw new TooManyRequestsException(error != null ? error
: "Too many requests");
case HttpStatus.SC_INTERNAL_SERVER_ERROR: // HTTP 500
throw new InternalServerErrorException(error != null ? error
: "Internal Server Error");
case HttpStatus.SC_SERVICE_UNAVAILABLE: // HTTP 503
throw new ServiceUnavailableException(error != null ? error
: "Service Unavailable");
default: // other errors
throw new ServiceResponseException(status, error);
}
}
/**
* Gets the error message from a JSON response
*
*
* {
* code: 400
* error: 'bad request'
* }
*
*
* .
*
* @param resp
* the HTTP response
* @return the error message from the json object
*/
private String getErrorMessage(HttpResponse resp) {
String error = null;
try {
error = ResponseUtil.getString(resp);
JSONObject respJson = new JSONObject(error);
error = respJson.getString("error");
if (error != null && error.isEmpty()) {
error = null;
}
} catch (Exception e) {
}
return error;
}
/**
* Gets the API key.
*
*
* @return the API key
*/
public String getApiKey() {
return apiKey;
}
/**
* Gets the default content type.
*
*
* @return the default content type
*/
protected String getDefaultContentType() {
return MediaType.APPLICATION_JSON;
}
/**
* Gets the default request.
*
*
* @return the default request
*/
protected HttpParams getDefaultRequestParams() {
final HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, CONNECTION_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, CONNECTION_TIMEOUT);
HttpClientParams.setRedirecting(params, false);
HttpProtocolParams.setUserAgent(params, getUserAgent());
ConnManagerParams.setMaxTotalConnections(params, MAX_TOTAL_CONNECTIONS);
return params;
}
/**
* Gets the API end point.
*
*
* @return the API end point
*/
public String getEndPoint() {
return endPoint;
}
/**
* Gets the gson.
*
*
* @return the gson
*/
protected Gson getGson() {
return gson;
};
/**
* Gets the http client.
*
*
* @return the http client
*/
public HttpClient getHttpClient() {
if (httpClient == null) {
httpClient = new DefaultHttpClient(getDefaultRequestParams());
}
return httpClient;
}
/**
* Gets the user agent.
*
*
* @return the user agent
*/
private final String getUserAgent() {
return "watson-developer-cloud-java-wrapper-0.1.3";
}
/**
* Sets the API key.
*
* @param apiKey
* the new API key
*/
public void setApiKey(String apiKey) {
this.apiKey = apiKey;
}
/**
* Sets the end point.
*
* @param endPoint
* the new end point
*/
public void setEndPoint(String endPoint) {
this.endPoint = endPoint;
}
/**
* Sets the username and password.
*
* @param username
* the username
* @param password
* the password
*/
public void setUsernameAndPassword(String username, String password) {
String auth = username + ":" + password;
apiKey = new String(Base64.encodeBase64(auth.getBytes()));
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("WatsonService [");
if (endPoint != null) {
builder.append("endPoint=");
builder.append(endPoint);
}
builder.append("]");
return builder.toString();
}
}
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