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.os.AsyncTask;
  21 import android.util.Log;
  22
  23 import net.ktnx.mobileledger.model.Data;
  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 taskCallback;
  45     private String token;
  46     private String session;
  47     private String backendUrl;
  48     private LedgerTransaction ltr;
  49     protected String error;
  50
  51     public SaveTransactionTask(TaskCallback callback) {
  52         taskCallback = callback;
  53     }
  54     private boolean sendOK() throws IOException {
  55         HttpURLConnection http = NetworkUtil.prepareConnection("add");
  56         http.setRequestMethod("POST");
  57         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
  58         http.setRequestProperty("Accept", "*/*");
  59         if ((session != null) && !session.isEmpty()) {
  60             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
  61         }
  62         http.setDoOutput(true);
  63         http.setDoInput(true);
  64
  65         UrlEncodedFormData params = new UrlEncodedFormData();
  66         params.addPair("_formid", "identify-add");
  67         if (token != null) params.addPair("_token", token);
  68         params.addPair("date", ltr.getDate());
  69         params.addPair("description", ltr.getDescription());
  70         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
  71             params.addPair("account", acc.getAccountName());
  72             if (acc.isAmountSet())
  73                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
  74             else params.addPair("amount", "");
  75         }
  76
  77         String body = params.toString();
  78         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
  79
  80         Log.d("network", "request header: " + http.getRequestProperties().toString());
  81
  82         try (OutputStream req = http.getOutputStream()) {
  83             Log.d("network", "Request body: " + body);
  84             req.write(body.getBytes("ASCII"));
  85
  86             try (InputStream resp = http.getInputStream()) {
  87                 Log.d("update_accounts", String.valueOf(http.getResponseCode()));
  88                 if (http.getResponseCode() == 303) {
  89                     // everything is fine
  90                     return true;
  91                 }
  92                 else if (http.getResponseCode() == 200) {
  93                     // get the new cookie
  94                     {
  95                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
  96
  97                         Map<String, List<String>> header = http.getHeaderFields();
  98                         List<String> cookieHeader = header.get("Set-Cookie");
  99                         if (cookieHeader != null) {
 100                             String cookie = cookieHeader.get(0);
 101                             Matcher m = reSessionCookie.matcher(cookie);
 102                             if (m.matches()) {
 103                                 session = m.group(1);
 104                                 Log.d("network", "new session is " + session);
 105                             }
 106                             else {
 107                                 Log.d("network", "set-cookie: " + cookie);
 108                                 Log.w("network",
 109                                         "Response Set-Cookie headers is not a _SESSION one");
 110                             }
 111                         }
 112                         else {
 113                             Log.w("network", "Response has no Set-Cookie header");
 114                         }
 115                     }
 116                     // the token needs to be updated
 117                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 118                     Pattern re = Pattern.compile(
 119                             "<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                 }
 133                 else {
 134                     throw new IOException(
 135                             String.format("Error response code %d", http.getResponseCode()));
 136                 }
 137             }
 138         }
 139     }
 140
 141     @Override
 142     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 143         error = null;
 144         try {
 145             backendUrl = Data.profile.get().getUrl();
 146             ltr = ledgerTransactions[0];
 147
 148             int tried = 0;
 149             while (!sendOK()) {
 150                 try {
 151                     tried++;
 152                     if (tried >= 2)
 153                         throw new IOException(String.format("aborting after %d tries", tried));
 154                     sleep(100);
 155                 }
 156                 catch (InterruptedException e) {
 157                     e.printStackTrace();
 158                 }
 159             }
 160         }
 161         catch (Exception e) {
 162             e.printStackTrace();
 163             error = e.getMessage();
 164         }
 165
 166         return null;
 167     }
 168
 169     @Override
 170     protected void onPostExecute(Void aVoid) {
 171         super.onPostExecute(aVoid);
 172         taskCallback.done(error);
 173     }
 174 }