package com.wordnik.client;
import com.fasterxml.jackson.core.JsonGenerator.Feature;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.api.client.filter.LoggingFilter;
import com.sun.jersey.api.client.WebResource.Builder;
import com.sun.jersey.multipart.FormDataMultiPart;
import javax.ws.rs.core.Response.Status.Family;
import javax.ws.rs.core.MediaType;
import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.io.IOException;
import java.net.URLEncoder;
import java.io.UnsupportedEncodingException;
public class ApiInvoker {
private static ApiInvoker INSTANCE = new ApiInvoker();
private Map<String, Client> hostMap = new HashMap<String, Client>();
private Map<String, String> defaultHeaderMap = new HashMap<String, String>();
private boolean isDebug = false;
public void enableDebug() {
isDebug = true;
}
public static ApiInvoker getInstance() {
return INSTANCE;
}
public void addDefaultHeader(String key, String value) {
defaultHeaderMap.put(key, value);
}
public String escapeString(String str) {
try{
return URLEncoder.encode(str, "utf8").replaceAll("\\+", "%20");
}
catch(UnsupportedEncodingException e) {
return str;
}
}
public static Object deserialize(String json, String containerType, Class cls) throws ApiException {
try{
if("List".equals(containerType)) {
JavaType typeInfo = JsonUtil.getJsonMapper().getTypeFactory().constructCollectionType(List.class, cls);
List response = (List<?>) JsonUtil.getJsonMapper().readValue(json, typeInfo);
return response;
}
else if(String.class.equals(cls)) {
if(json != null && json.startsWith("\"") && json.endsWith("\"") && json.length() > 1)
return json.substring(1, json.length() - 2);
else
return json;
}
else {
return JsonUtil.getJsonMapper().readValue(json, cls);
}
}
catch (IOException e) {
throw new ApiException(500, e.getMessage());
}
}
public static String serialize(Object obj) throws ApiException {
try {
if (obj != null)
return JsonUtil.getJsonMapper().writeValueAsString(obj);
else
return null;
}
catch (Exception e) {
throw new ApiException(500, e.getMessage());
}
}
public String invokeAPI(String host, String path, String method, Map<String, String> queryParams, Object body, Map<String, String> headerParams, Map<String, String> formParams, String contentType) throws ApiException {
Client client = getClient(host);
StringBuilder b = new StringBuilder();
for(String key : queryParams.keySet()) {
String value = queryParams.get(key);
if (value != null){
if(b.toString().length() == 0)
b.append("?");
else
b.append("&");
b.append(escapeString(key)).append("=").append(escapeString(value));
}
}
String querystring = b.toString();
Builder builder = client.resource(host + path + querystring).accept("application/json");
for(String key : headerParams.keySet()) {
builder.header(key, headerParams.get(key));
}
for(String key : defaultHeaderMap.keySet()) {
if(!headerParams.containsKey(key)) {
builder.header(key, defaultHeaderMap.get(key));
}
}
ClientResponse response = null;
if("GET".equals(method)) {
response = (ClientResponse) builder.get(ClientResponse.class);
}
else if ("POST".equals(method)) {
if(body == null)
response = builder.post(ClientResponse.class, null);
else if(body instanceof FormDataMultiPart) {
response = builder.type(contentType).post(ClientResponse.class, body);
}
else
response = builder.type(contentType).post(ClientResponse.class, serialize(body));
}
else if ("PUT".equals(method)) {
if(body == null)
response = builder.put(ClientResponse.class, serialize(body));
else {
if("application/x-www-form-urlencoded".equals(contentType)) {
StringBuilder formParamBuilder = new StringBuilder();
// encode the form params
for(String key : formParams.keySet()) {
String value = formParams.get(key);
if(value != null && !"".equals(value.trim())) {
if(formParamBuilder.length() > 0) {
formParamBuilder.append("&");
}
try {
formParamBuilder.append(URLEncoder.encode(key, "utf8")).append("=").append(URLEncoder.encode(value, "utf8"));
}
catch (Exception e) {
// move on to next
}
}
}
response = builder.type(contentType).put(ClientResponse.class, formParamBuilder.toString());
}
else
response = builder.type(contentType).put(ClientResponse.class, serialize(body));
}
}
else if ("DELETE".equals(method)) {
if(body == null)
response = builder.delete(ClientResponse.class, serialize(body));
else
response = builder.type(contentType).delete(ClientResponse.class, serialize(body));
}
else {
throw new ApiException(500, "unknown method type " + method);
}
if(response.getClientResponseStatus() == ClientResponse.Status.NO_CONTENT) {
return null;
}
else if(response.getClientResponseStatus().getFamily() == Family.SUCCESSFUL) {
return (String) response.getEntity(String.class);
}
else {
throw new ApiException(
response.getClientResponseStatus().getStatusCode(),
response.getEntity(String.class));
}
}
private Client getClient(String host) {
if(!hostMap.containsKey(host)) {
Client client = Client.create();
if(isDebug)
client.addFilter(new LoggingFilter());
hostMap.put(host, client);
}
return hostMap.get(host);
}
}