app/src/main/java/net/ktnx/mobileledger/async/SaveTransactionTask.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * Mobile-Ledger is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.content.SharedPreferences;
  21 import android.os.AsyncTask;
  22 import android.util.Log;
  23
  24 import net.ktnx.mobileledger.model.LedgerTransaction;
  25 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  26 import net.ktnx.mobileledger.utils.NetworkUtil;
  27 import net.ktnx.mobileledger.utils.UrlEncodedFormData;
  28
  29 import java.io.BufferedReader;
  30 import java.io.IOException;
  31 import java.io.InputStream;
  32 import java.io.InputStreamReader;
  33 import java.io.OutputStream;
  34 import java.net.HttpURLConnection;
  35 import java.util.List;
  36 import java.util.Locale;
  37 import java.util.Map;
  38 import java.util.regex.Matcher;
  39 import java.util.regex.Pattern;
  40
  41 import static java.lang.Thread.sleep;
  42
  43 public class SaveTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  44     private final TaskCallback task_callback;
  45     private String token;
  46     private String session;
  47     private String backend_url;
  48     private LedgerTransaction ltr;
  49     protected String error;
  50
  51     private SharedPreferences pref;
  52     public void setPref(SharedPreferences pref) {
  53         this.pref = pref;
  54     }
  55
  56     public SaveTransactionTask(TaskCallback callback) {
  57         task_callback = callback;
  58     }
  59     private boolean send_ok() throws IOException {
  60         HttpURLConnection http = NetworkUtil.prepare_connection("add");
  61         http.setRequestMethod("POST");
  62         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
  63         http.setRequestProperty("Accept", "*/*");
  64         if ((session != null) && !session.isEmpty()) {
  65             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
  66         }
  67         http.setDoOutput(true);
  68         http.setDoInput(true);
  69
  70         UrlEncodedFormData params = new UrlEncodedFormData();
  71         params.add_pair("_formid", "identify-add");
  72         if (token != null) params.add_pair("_token", token);
  73         params.add_pair("date", ltr.getDate());
  74         params.add_pair("description", ltr.getDescription());
  75         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
  76             params.add_pair("account", acc.getAccountName());
  77             if (acc.isAmountSet())
  78                 params.add_pair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
  79             else params.add_pair("amount", "");
  80         }
  81
  82         String body = params.toString();
  83         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
  84
  85         Log.d("network", "request header: " + http.getRequestProperties().toString());
  86
  87         try (OutputStream req = http.getOutputStream()) {
  88             Log.d("network", "Request body: " + body);
  89             req.write(body.getBytes("ASCII"));
  90
  91             try (InputStream resp = http.getInputStream()) {
  92                 Log.d("update_accounts", String.valueOf(http.getResponseCode()));
  93                 if (http.getResponseCode() == 303) {
  94                     // everything is fine
  95                     return true;
  96                 } else if (http.getResponseCode() == 200) {
  97                     // get the new cookie
  98                     {
  99                         Pattern sess_cookie_re = Pattern.compile("_SESSION=([^;]+);.*");
 100
 101                         Map<String, List<String>> header = http.getHeaderFields();
 102                         List<String> cookie_header = header.get("Set-Cookie");
 103                         if (cookie_header != null) {
 104                             String cookie = cookie_header.get(0);
 105                             Matcher m = sess_cookie_re.matcher(cookie);
 106                             if (m.matches()) {
 107                                 session = m.group(1);
 108                                 Log.d("network", "new session is " + session);
 109                             } else {
 110                                 Log.d("network", "set-cookie: " + cookie);
 111                                 Log.w("network", "Response Set-Cookie headers is not a _SESSION one");
 112                             }
 113                         } else {
 114                             Log.w("network", "Response has no Set-Cookie header");
 115                         }
 116                     }
 117                     // the token needs to be updated
 118                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 119                     Pattern re = Pattern.compile("<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 120                     String line;
 121                     while ((line = reader.readLine()) != null) {
 122                         //Log.d("dump", line);
 123                         Matcher m = re.matcher(line);
 124                         if (m.matches()) {
 125                             token = m.group(1);
 126                             Log.d("save-transaction", line);
 127                             Log.d("save-transaction", "Token=" + token);
 128                             return false;       // retry
 129                         }
 130                     }
 131                     throw new IOException("Can't find _token string");
 132                 } else {
 133                     throw new IOException(String.format("Error response code %d", http.getResponseCode()));
 134                 }
 135             }
 136         }
 137     }
 138
 139     @Override
 140     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 141         error = null;
 142         try {
 143             backend_url = pref.getString("backend_url", "");
 144             ltr = ledgerTransactions[0];
 145
 146             int tried = 0;
 147             while (!send_ok()) {
 148                 try {
 149                     tried++;
 150                     if (tried >= 2)
 151                         throw new IOException(String.format("aborting after %d tries", tried));
 152                     sleep(100);
 153                 }
 154                 catch (InterruptedException e) {
 155                     e.printStackTrace();
 156                 }
 157             }
 158         }
 159         catch (Exception e) {
 160             e.printStackTrace();
 161             error = e.getMessage();
 162         }
 163
 164         return null;
 165     }
 166
 167     @Override
 168     protected void onPostExecute(Void aVoid) {
 169         super.onPostExecute(aVoid);
 170         task_callback.done(error);
 171     }
 172 }