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EasyPost Java Client Library for the EasyPost Shipping API
package com.easypost.net;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.net.URLStreamHandler;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.easypost.EasyPost;
import com.easypost.exception.EasyPostException;
import com.easypost.model.BatchStatus;
import com.easypost.model.Event;
import com.easypost.model.EventDeserializer;
import com.easypost.model.Rate;
import com.easypost.model.RateDeserializer;
import com.easypost.model.Shipment;
import com.easypost.model.TrackingDetail;
public abstract class EasyPostResource {
public static final Gson gson = new GsonBuilder()
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.registerTypeAdapter(Event.class, new EventDeserializer())
.registerTypeAdapter(Rate.class, new RateDeserializer())
.create();
public static final Gson prettyPrintGson = new GsonBuilder().
setPrettyPrinting().
serializeNulls().
setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).
registerTypeAdapter(Event.class, new EventDeserializer()).
create();
@Override public String toString() {
return (String) this.getIdString();
}
public String prettyPrint() {
return String.format(
"<%s@%s id=%s> JSON: %s",
this.getClass().getName(),
System.identityHashCode(this),
this.getIdString(),
prettyPrintGson.toJson(this));
}
private Object getIdString() {
try {
Field idField = this.getClass().getDeclaredField("id");
return idField.get(this);
} catch (SecurityException e) {
return "";
} catch (NoSuchFieldException e) {
return "";
} catch (IllegalArgumentException e) {
return "";
} catch (IllegalAccessException e) {
return "";
}
}
private static String className(Class clazz) {
return clazz.getSimpleName().replaceAll("([a-z])([A-Z])", "$1_$2").toLowerCase().replace("$", "");
}
protected static String singleClassURL(Class clazz) {
return String.format("%s/%s", EasyPost.API_BASE, className(clazz));
}
protected static String classURL(Class clazz) {
String singleURL = singleClassURL(clazz);
if (singleURL.charAt(singleURL.length() - 1) == 's' || singleURL.charAt(singleURL.length() - 1) == 'h') {
return String.format("%ses", singleClassURL(clazz));
} else {
return String.format("%ss", singleClassURL(clazz));
}
}
protected static String instanceURL(Class clazz, String id) {
return String.format("%s/%s", classURL(clazz), id);
}
public void merge(EasyPostResource obj, EasyPostResource update) {
if (!obj.getClass().isAssignableFrom(update.getClass())) {
return;
}
Method[] methods = obj.getClass().getMethods();
for (Method fromMethod: methods) {
if (fromMethod.getDeclaringClass().equals(obj.getClass()) && fromMethod.getName().startsWith("get")) {
String fromName = fromMethod.getName();
String toName = fromName.replace("get", "set");
try {
Object value = fromMethod.invoke(update, (Object[]) null);
if (value != null) {
Method toMethod = obj.getClass().getMethod(toName, fromMethod.getReturnType());
toMethod.invoke(obj, value);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
public static final String CHARSET = "UTF-8";
private static final String DNS_CACHE_TTL_PROPERTY_NAME = "networkaddress.cache.ttl";
// Set this property to override your environment's default URLStreamHandler.
private static final String CUSTOM_URL_STREAM_HANDLER_PROPERTY_NAME = "com.easypost.net.customURLStreamHandler";
protected enum RequestMethod {
GET, POST, DELETE, PUT
}
private static String urlEncodePair(String k, String v) throws UnsupportedEncodingException {
return String.format("%s=%s", URLEncoder.encode(k, CHARSET), URLEncoder.encode(v, CHARSET));
}
static Map getHeaders(String apiKey) {
Map headers = new HashMap();
headers.put("Accept-Charset", CHARSET);
headers.put("User-Agent", String.format("EasyPost/v2 JavaClient/%s", EasyPost.VERSION));
if (apiKey == null) {
apiKey = EasyPost.apiKey;
}
headers.put("Authorization", String.format("Bearer %s", apiKey));
// debug headers
String[] propertyNames = { "os.name", "os.version", "os.arch",
"java.version", "java.vendor", "java.vm.version",
"java.vm.vendor" };
Map propertyMap = new HashMap();
for (String propertyName : propertyNames) {
propertyMap.put(propertyName, System.getProperty(propertyName));
}
propertyMap.put("lang", "Java");
propertyMap.put("publisher", "EasyPost");
headers.put("X-Client-User-Agent", gson.toJson(propertyMap));
return headers;
}
private static javax.net.ssl.HttpsURLConnection createEasyPostConnection(String url, String apiKey) throws IOException {
URL easypostURL = null;
String customURLStreamHandlerClassName = System.getProperty(CUSTOM_URL_STREAM_HANDLER_PROPERTY_NAME, null);
if (customURLStreamHandlerClassName != null) {
// instantiate the custom handler provided
try {
Class clazz = (Class) Class.forName(customURLStreamHandlerClassName);
Constructor constructor = clazz.getConstructor();
URLStreamHandler customHandler = constructor.newInstance();
easypostURL = new URL(null, url, customHandler);
} catch (ClassNotFoundException e) {
throw new IOException(e);
} catch (SecurityException e) {
throw new IOException(e);
} catch (NoSuchMethodException e) {
throw new IOException(e);
} catch (IllegalArgumentException e) {
throw new IOException(e);
} catch (InstantiationException e) {
throw new IOException(e);
} catch (IllegalAccessException e) {
throw new IOException(e);
} catch (InvocationTargetException e) {
throw new IOException(e);
}
} else {
easypostURL = new URL(url);
}
javax.net.ssl.HttpsURLConnection conn = (javax.net.ssl.HttpsURLConnection) easypostURL.openConnection();
conn.setConnectTimeout(20000); // 20 seconds
int readTimeout;
if (EasyPost.readTimeout != 0) {
readTimeout = EasyPost.readTimeout;
} else{
readTimeout = 40000; // 40 seconds by default
}
conn.setReadTimeout(readTimeout);
conn.setUseCaches(false);
for (Map.Entry header : getHeaders(apiKey).entrySet()) {
conn.setRequestProperty(header.getKey(), header.getValue());
}
return conn;
}
private static javax.net.ssl.HttpsURLConnection createGetConnection(String url, String query, String apiKey) throws IOException {
String getURL = String.format("%s?%s", url, query);
javax.net.ssl.HttpsURLConnection conn = createEasyPostConnection(getURL, apiKey);
conn.setRequestMethod("GET");
return conn;
}
private static javax.net.ssl.HttpsURLConnection createPostConnection(String url, String query, String apiKey) throws IOException {
javax.net.ssl.HttpsURLConnection conn = createEasyPostConnection(url, apiKey);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", String.format("application/x-www-form-urlencoded;charset=%s", CHARSET));
OutputStream output = null;
try {
output = conn.getOutputStream();
output.write(query.getBytes(CHARSET));
} finally {
if (output != null) {
output.close();
}
}
return conn;
}
private static javax.net.ssl.HttpsURLConnection createDeleteConnection(String url, String query, String apiKey) throws IOException {
String deleteUrl = String.format("%s?%s", url, query);
javax.net.ssl.HttpsURLConnection conn = createEasyPostConnection(deleteUrl, apiKey);
conn.setRequestMethod("DELETE");
return conn;
}
private static javax.net.ssl.HttpsURLConnection createPutConnection(String url, String query, String apiKey) throws IOException {
String putUrl = String.format("%s?%s", url, query);
javax.net.ssl.HttpsURLConnection conn = createEasyPostConnection(putUrl, apiKey);
conn.setRequestMethod("PUT");
return conn;
}
private static String createQuery(Map params) throws UnsupportedEncodingException {
Map flatParams = flattenParams(params);
StringBuffer queryStringBuffer = new StringBuffer();
for (Map.Entry entry : flatParams.entrySet()) {
queryStringBuffer.append("&");
queryStringBuffer.append(urlEncodePair(entry.getKey(), entry.getValue()));
}
if (queryStringBuffer.length() > 0) {
queryStringBuffer.deleteCharAt(0);
}
return queryStringBuffer.toString();
}
private static Map flattenParams(Map params) {
if (params == null) {
return new HashMap();
}
Map flatParams = new HashMap();
for (Map.Entry entry : params.entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
if (value instanceof Map) {
Map flatNestedMap = new HashMap();
Map nestedMap = (Map) value;
for (Map.Entry nestedEntry : nestedMap.entrySet()) {
flatNestedMap.put(
String.format("%s[%s]", key, nestedEntry.getKey()),
nestedEntry.getValue());
}
flatParams.putAll(flattenParams(flatNestedMap));
} else if (value instanceof List) {
Map flatNestedMap = new HashMap();
List nestedList = (List) value;
for (int i = 0; i < nestedList.size(); i++) {
flatNestedMap.put(
String.format("%s[%s]", key, i),
nestedList.get(i));
flatParams.putAll(flattenParams(flatNestedMap));
}
} else if (value instanceof EasyPostResource) {
flatParams.put(
String.format("%s[%s]", key, "id"),
value.toString());
} else if (value != null) {
flatParams.put(key, value.toString());
}
}
// System.out.println(flatParams);
return flatParams;
}
// represents Errors returned as JSON
private static class ErrorContainer {
private EasyPostResource.Error error;
}
private static class Error {
@SuppressWarnings("unused")
String type;
String message;
String code;
String param;
String error;
}
private static String getResponseBody(InputStream responseStream) throws IOException {
String rBody = new Scanner(responseStream, CHARSET).useDelimiter("\\A").next();
responseStream.close();
return rBody;
}
private static EasyPostResponse makeURLConnectionRequest(EasyPostResource.RequestMethod method, String url, String query, String apiKey) throws EasyPostException {
javax.net.ssl.HttpsURLConnection conn = null;
try {
switch (method) {
case GET:
conn = createGetConnection(url, query, apiKey);
break;
case POST:
conn = createPostConnection(url, query, apiKey);
break;
case DELETE:
conn = createDeleteConnection(url, query, apiKey);
break;
case PUT:
conn = createPutConnection(url, query, apiKey);
break;
default:
throw new EasyPostException(
String.format("Unrecognized HTTP method %s. Please contact EasyPost at [email protected].", method));
}
int rCode = conn.getResponseCode(); // sends the request
String rBody = null;
if (rCode == 204) {
rBody = "";
} else if (rCode >= 200 && rCode < 300) {
rBody = getResponseBody(conn.getInputStream());
} else {
rBody = getResponseBody(conn.getErrorStream());
}
return new EasyPostResponse(rCode, rBody);
} catch (IOException e) {
throw new EasyPostException(
String.format(
"Could not connect to EasyPost (%s). "
+ "Please check your internet connection and try again. If this problem persists,"
+ "please contact us at [email protected].", EasyPost.API_BASE), e);
} finally {
if (conn != null) {
conn.disconnect();
}
}
}
protected static T request(EasyPostResource.RequestMethod method, String url, Map params, Class clazz, String apiKey) throws EasyPostException {
return request(method, url, params, clazz, apiKey, true);
}
protected static T request(EasyPostResource.RequestMethod method, String url, Map params, Class clazz, String apiKey, boolean apiKeyRequired) throws EasyPostException {
String originalDNSCacheTTL = null;
Boolean allowedToSetTTL = true;
try {
originalDNSCacheTTL = java.security.Security.getProperty(DNS_CACHE_TTL_PROPERTY_NAME);
// disable DNS cache
java.security.Security.setProperty(DNS_CACHE_TTL_PROPERTY_NAME, "0");
} catch (SecurityException se) {
allowedToSetTTL = false;
}
try {
return _request(method, url, params, clazz, apiKey, apiKeyRequired);
} finally {
if (allowedToSetTTL) {
if (originalDNSCacheTTL == null) {
// value unspecified by implementation
java.security.Security.setProperty(DNS_CACHE_TTL_PROPERTY_NAME, "-1"); // cache forever
} else {
java.security.Security.setProperty(DNS_CACHE_TTL_PROPERTY_NAME, originalDNSCacheTTL);
}
}
}
}
protected static T _request(EasyPostResource.RequestMethod method, String url, Map params, Class clazz, String apiKey, boolean apiKeyRequired) throws EasyPostException {
if ((EasyPost.apiKey == null || EasyPost.apiKey.length() == 0) && (apiKey == null || apiKey.length() == 0)) {
if (apiKeyRequired) {
throw new EasyPostException(
"No API key provided. (set your API key using 'EasyPost.apiKey = {KEY}'. "
+ "Your API key can be found in your EasyPost dashboard, or you can email us at [email protected] for assistance.");
}
}
if (apiKey == null) {
apiKey = EasyPost.apiKey;
}
String query;
try {
query = createQuery(params);
} catch (UnsupportedEncodingException e) {
throw new EasyPostException("Unable to encode parameters to "
+ CHARSET
+ ". Please email [email protected] for assistance.", e);
}
// System.out.println(url);
EasyPostResponse response;
try {
// HTTPSURLConnection verifies SSL cert by default
response = makeURLConnectionRequest(method, url, query, apiKey);
} catch (ClassCastException ce) {
// appengine
String appEngineEnv = System.getProperty("com.google.appengine.runtime.environment", null);
if (appEngineEnv != null) {
response = makeAppEngineRequest(method, url, query, apiKey);
} else {
throw ce;
}
}
int rCode = response.responseCode;
String rBody = response.responseBody;
if (rCode < 200 || rCode >= 300) {
handleAPIError(rBody, rCode);
}
return gson.fromJson(rBody, clazz);
}
private static void handleAPIError(String rBody, int rCode) throws EasyPostException {
try {
EasyPostResource.Error error = gson.fromJson(rBody, EasyPostResource.Error.class);
if(error.error.length() > 0) {
throw new EasyPostException(error.error);
}
throw new EasyPostException(error.message, error.param, null);
} catch (Exception e) {
throw new EasyPostException(String.format("An error occured. Response code: %s Response body: %s", rCode, rBody));
}
}
private static EasyPostResponse makeAppEngineRequest(RequestMethod method, String url, String query, String apiKey) throws EasyPostException {
String unknownErrorMessage = "Sorry, an unknown error occurred while trying to use the "
+ "Google App Engine runtime. Please email [email protected] for assistance.";
try {
if (method == RequestMethod.GET || method == RequestMethod.DELETE) {
url = String.format("%s?%s", url, query);
}
URL fetchURL = new URL(url);
Class requestMethodClass = Class.forName("com.google.appengine.api.urlfetch.HTTPMethod");
Object httpMethod = requestMethodClass.getDeclaredField(method.name()).get(null);
Class fetchOptionsBuilderClass = Class.forName("com.google.appengine.api.urlfetch.FetchOptions$Builder");
Object fetchOptions = null;
try {
fetchOptions = fetchOptionsBuilderClass.getDeclaredMethod("validateCertificate").invoke(null);
} catch (NoSuchMethodException e) {
System.err
.println("Warning: this App Engine SDK version does not allow verification of SSL certificates;"
+ "this exposes you to a MITM attack. Please upgrade your App Engine SDK to >=1.5.0. "
+ "If you have questions, email [email protected].");
fetchOptions = fetchOptionsBuilderClass.getDeclaredMethod("withDefaults").invoke(null);
}
Class fetchOptionsClass = Class.forName("com.google.appengine.api.urlfetch.FetchOptions");
// Heroku times out after 30s, so leave some time for the API to return a response
fetchOptionsClass.getDeclaredMethod("setDeadline", java.lang.Double.class).invoke(fetchOptions, new Double(20));
Class requestClass = Class.forName("com.google.appengine.api.urlfetch.HTTPRequest");
Object request = requestClass.getDeclaredConstructor(URL.class, requestMethodClass, fetchOptionsClass).newInstance(fetchURL, httpMethod, fetchOptions);
if (method == RequestMethod.POST) {
requestClass.getDeclaredMethod("setPayload", byte[].class).invoke(request, query.getBytes());
}
for (Map.Entry header : getHeaders(apiKey).entrySet()) {
Class httpHeaderClass = Class.forName("com.google.appengine.api.urlfetch.HTTPHeader");
Object reqHeader = httpHeaderClass.getDeclaredConstructor(String.class, String.class).newInstance(header.getKey(), header.getValue());
requestClass.getDeclaredMethod("setHeader", httpHeaderClass).invoke(request, reqHeader);
}
Class urlFetchFactoryClass = Class.forName("com.google.appengine.api.urlfetch.URLFetchServiceFactory");
Object urlFetchService = urlFetchFactoryClass.getDeclaredMethod("getURLFetchService").invoke(null);
Method fetchMethod = urlFetchService.getClass().getDeclaredMethod("fetch", requestClass);
fetchMethod.setAccessible(true);
Object response = fetchMethod.invoke(urlFetchService, request);
int responseCode = (Integer) response.getClass().getDeclaredMethod("getResponseCode").invoke(response);
String body = new String((byte[]) response.getClass().getDeclaredMethod("getContent").invoke(response), CHARSET);
return new EasyPostResponse(responseCode, body);
} catch (InvocationTargetException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (MalformedURLException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (NoSuchFieldException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (SecurityException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (NoSuchMethodException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (ClassNotFoundException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (IllegalArgumentException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (IllegalAccessException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (InstantiationException e) {
throw new EasyPostException(unknownErrorMessage, e);
} catch (UnsupportedEncodingException e) {
throw new EasyPostException(unknownErrorMessage, e);
}
}
public String getId() {
return "";
}
public String getMode() {
return "";
}
// Batch
public List getShipments() {
return new ArrayList();
}
// public BatchStatus getStatus() {
// return new BatchStatus();
// }
public String getLabelUrl() {
return "";
}
// Tracker
public String getShipmentId() {
return "";
}
public String getTrackingCode() {
return "";
}
public String getStatus() {
return "";
}
public List getTrackingDetails() {
return new ArrayList();
}
}