Java tutorial
/* * Copyright 2011 Devin Schwab, Umang Banugaria * * This file is part of the APO Theta Upsilon App for Case Western Reserve University's Alpha Phi Omega Theta Upsilon Chapter. * * The APO Theta Upsilon program is free software: you can redistribute it and/or modify * it under the terms of the Lesser GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * Lesser GNU General Public License for more details. * * You should have received a copy of the Lesser GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package edu.cwru.apo; import java.net.URLEncoder; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import org.apache.http.client.HttpClient; import org.json.JSONException; import org.json.JSONObject; import edu.cwru.apo.RestClient.RequestMethod; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.content.SharedPreferences; import android.os.AsyncTask; public class API extends Activity { private static HttpClient httpClient = null; private static String secureUrl = "https://apo.case.edu:8090/api/api.php"; private Context context; public enum Methods { login, checkCredentials, logout, resetPassword, getContract, phone, serviceReport, checkAES, decryptRSA, users, checkAppVersion }; public API(Context context) { this.context = context; if (httpClient == null) httpClient = new TrustAPOHttpClient(this.context); // context leak? if (Auth.Hmac == null) Auth.Hmac = new DynamicHmac(); } public boolean callMethod(Methods method, AsyncRestRequestListener<Methods, JSONObject> callback, String... params) { boolean result = false; switch (method) { case checkAppVersion: ApiCall checkVersionCall = new ApiCall(context, callback, method, "Checking for updates", "Please Wait"); RestClient checkVersionClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); checkVersionClient.AddParam("method", "appVersion"); //execute the call checkVersionCall.execute(checkVersionClient); result = true; break; case login: if (params.length != 2) break; if (params[0] == null || params[1] == null) break; // set up a login request NOTE: Must be HTTPS!! ApiCall loginCall = new ApiCall(context, callback, method, "Logging In", "Please Wait"); RestClient loginClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); loginClient.AddParam("method", "login"); loginClient.AddParam("user", params[0]); loginClient.AddParam("pass", Auth.md5(params[1]).toString()); loginClient.AddParam("installID", URLEncoder.encode(Installation.id(context.getApplicationContext()))); loginClient.AddParam("secretKey", Auth.Hmac.getSecretKey().toString()); //execute the call loginCall.execute(loginClient); result = true; break; case checkCredentials: // set up a checkCredentials request ApiCall checkCredentialsCall = new ApiCall(context, callback, method); RestClient checkCredentialsClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); // if both exist add parameters to call and execute String installID = Installation.id(context.getApplicationContext()); String timestamp = Long.toString(Auth.getTimestamp()); String data = "checkCredentials" + timestamp + installID; checkCredentialsClient.AddParam("method", "checkCredentials"); checkCredentialsClient.AddParam("installID", installID); checkCredentialsClient.AddParam("timestamp", timestamp); try { checkCredentialsClient.AddParam("HMAC", Auth.Hmac.generate(data).toString()); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } //execute the call checkCredentialsCall.execute(checkCredentialsClient); result = true; break; case logout: // set up a logout request break; case resetPassword: // set up a resetPassword request break; case getContract: // set up a getContract request ApiCall getContractCall = new ApiCall(context, callback, method, "Loading", "Please Wait"); RestClient getContractClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); // if both exist add parameters to call and execute String contractinstallID = Installation.id(context.getApplicationContext()); String contracttimestamp = Long.toString(Auth.getTimestamp()); String contractdata = "getContract" + contracttimestamp + contractinstallID; getContractClient.AddParam("method", "getContract"); getContractClient.AddParam("installID", contractinstallID); getContractClient.AddParam("timestamp", contracttimestamp); try { getContractClient.AddParam("HMAC", Auth.Hmac.generate(contractdata).toString()); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } //execute the call getContractCall.execute(getContractClient); result = true; break; case phone: // set up a phone request ApiCall phoneCall = new ApiCall(context, callback, method, "Updating User Directory", "Please Wait"); RestClient phoneClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); // if both exist add parameters to call and execute String phoneInstallID = Installation.id(context.getApplicationContext()); String phoneTimestamp = Long.toString(Auth.getTimestamp()); JSONObject phoneUserData = new JSONObject(); try { if (params != null) phoneUserData.put("updateTime", Long.parseLong(params[0])); else phoneUserData.put("updateTime", getUpdateTime(context.getSharedPreferences(APO.PREF_FILE_NAME, MODE_PRIVATE))); String phoneUD = URLEncoder.encode(phoneUserData.toString()); String phoneData = "phone" + phoneTimestamp + phoneInstallID + phoneUserData.toString(); phoneClient.AddParam("method", "phone"); phoneClient.AddParam("installID", phoneInstallID); phoneClient.AddParam("timestamp", phoneTimestamp); phoneClient.AddParam("userData", phoneUD); phoneClient.AddParam("HMAC", Auth.Hmac.generate(phoneData).toString()); } catch (JSONException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } //execute the call phoneCall.execute(phoneClient); result = true; break; } return result; } public boolean callMethod(Methods method, AsyncRestRequestListener<Methods, JSONObject> callback, JSONObject json, String... params) { boolean result = false; switch (method) { case serviceReport: // set up a phone request ApiCall reportCall = new ApiCall(context, callback, method, "Submitting Service Report", "Please Wait"); RestClient reportClient = new RestClient(secureUrl, httpClient, RequestMethod.POST); // if both exist add parameters to call and execute String reportInstallID = Installation.id(context.getApplicationContext()); String reportTimestamp = Long.toString(Auth.getTimestamp()); JSONObject reportUserData = new JSONObject(); try { reportUserData.put("date", params[0]); reportUserData.put("projectName", params[1]); reportUserData.put("projectLocation", params[2]); reportUserData.put("inOut", params[3]); reportUserData.put("offCampus", params[4]); reportUserData.put("serviceType", params[5]); reportUserData.put("travelTime", params[6]); reportUserData.put("comments", params[7]); reportUserData.put("numBros", params[8]); reportUserData.put("brothers", json); } catch (JSONException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String reportUD = URLEncoder.encode(reportUserData.toString()); String reportData = "serviceReport" + reportTimestamp + reportInstallID + reportUserData.toString(); reportClient.AddParam("method", "serviceReport"); reportClient.AddParam("installID", reportInstallID); reportClient.AddParam("timestamp", reportTimestamp); reportClient.AddParam("userData", reportUD); try { reportClient.AddParam("HMAC", Auth.Hmac.generate(reportData).toString()); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } //execute the call reportCall.execute(reportClient); result = true; break; } return result; } private long getUpdateTime(SharedPreferences prefs) { return prefs.getLong("updateTime", 0); } private class ApiCall extends AsyncTask<RestClient, Void, JSONObject> { private Context context; private AsyncRestRequestListener<Methods, JSONObject> callback; private Context progContext; private String progTitle; private String progMsg; private Methods method; private ProgressDialog progDialog; // constructor used when no progress dialog is desired public ApiCall(Context context, AsyncRestRequestListener<Methods, JSONObject> cb, Methods method) { this.context = context.getApplicationContext(); this.callback = cb; this.method = method; } // constructor used when progress dialog is desired public ApiCall(Context context, AsyncRestRequestListener<Methods, JSONObject> cb, Methods method, String title, String message) { this.context = context.getApplicationContext(); this.callback = cb; this.method = method; this.progContext = context; this.progTitle = title; this.progMsg = message; } @Override protected void onPreExecute() { // if message and title were specified start progress dialog if ((progTitle != null) && (progMsg != null)) { progDialog = ProgressDialog.show(progContext, progTitle, progMsg, false); } } @Override protected JSONObject doInBackground(RestClient... params) { // start the requests JSONObject jObject = null; try { params[0].Execute(); // only ever expect one param. If there are more ignore them jObject = new JSONObject(params[0].getResponse()); // convert the response to a JSON object // put a default response in the case that the web server returned nothing if (jObject == null) jObject.put("requestStatus", params[0].getErrorMessage()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return jObject; } @Override protected void onPostExecute(JSONObject result) { //dismiss the progress dialog if (progDialog != null) progDialog.cancel(); // initiate the callback callback.onRestRequestComplete(method, result); } } }