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.Globals;
  27 import net.ktnx.mobileledger.utils.NetworkUtil;
  28 import net.ktnx.mobileledger.utils.UrlEncodedFormData;
  29
  30 import java.io.BufferedReader;
  31 import java.io.IOException;
  32 import java.io.InputStream;
  33 import java.io.InputStreamReader;
  34 import java.io.OutputStream;
  35 import java.net.HttpURLConnection;
  36 import java.util.List;
  37 import java.util.Locale;
  38 import java.util.Map;
  39 import java.util.regex.Matcher;
  40 import java.util.regex.Pattern;
  41
  42 import static java.lang.Thread.sleep;
  43
  44 public class SaveTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  45     private final TaskCallback taskCallback;
  46     protected String error;
  47     private String token;
  48     private String session;
  49     private String backendUrl;
  50     private LedgerTransaction ltr;
  51
  52     public SaveTransactionTask(TaskCallback callback) {
  53         taskCallback = callback;
  54     }
  55     private boolean sendOK() throws IOException {
  56         HttpURLConnection http = NetworkUtil.prepareConnection("add");
  57         http.setRequestMethod("POST");
  58         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
  59         http.setRequestProperty("Accept", "*/*");
  60         if ((session != null) && !session.isEmpty()) {
  61             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
  62         }
  63         http.setDoOutput(true);
  64         http.setDoInput(true);
  65
  66         UrlEncodedFormData params = new UrlEncodedFormData();
  67         params.addPair("_formid", "identify-add");
  68         if (token != null) params.addPair("_token", token);
  69         params.addPair("date", Globals.formatLedgerDate(ltr.getDate()));
  70         params.addPair("description", ltr.getDescription());
  71         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
  72             params.addPair("account", acc.getAccountName());
  73             if (acc.isAmountSet())
  74                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
  75             else params.addPair("amount", "");
  76         }
  77
  78         String body = params.toString();
  79         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
  80
  81         Log.d("network", "request header: " + http.getRequestProperties().toString());
  82
  83         try (OutputStream req = http.getOutputStream()) {
  84             Log.d("network", "Request body: " + body);
  85             req.write(body.getBytes("ASCII"));
  86
  87             try (InputStream resp = http.getInputStream()) {
  88                 Log.d("update_accounts", String.valueOf(http.getResponseCode()));
  89                 if (http.getResponseCode() == 303) {
  90                     // everything is fine
  91                     return true;
  92                 }
  93                 else if (http.getResponseCode() == 200) {
  94                     // get the new cookie
  95                     {
  96                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
  97
  98                         Map<String, List<String>> header = http.getHeaderFields();
  99                         List<String> cookieHeader = header.get("Set-Cookie");
 100                         if (cookieHeader != null) {
 101                             String cookie = cookieHeader.get(0);
 102                             Matcher m = reSessionCookie.matcher(cookie);
 103                             if (m.matches()) {
 104                                 session = m.group(1);
 105                                 Log.d("network", "new session is " + session);
 106                             }
 107                             else {
 108                                 Log.d("network", "set-cookie: " + cookie);
 109                                 Log.w("network",
 110                                         "Response Set-Cookie headers is not a _SESSION one");
 111                             }
 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(
 120                             "<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 121                     String line;
 122                     while ((line = reader.readLine()) != null) {
 123                         //Log.d("dump", line);
 124                         Matcher m = re.matcher(line);
 125                         if (m.matches()) {
 126                             token = m.group(1);
 127                             Log.d("save-transaction", line);
 128                             Log.d("save-transaction", "Token=" + token);
 129                             return false;       // retry
 130                         }
 131                     }
 132                     throw new IOException("Can't find _token string");
 133                 }
 134                 else {
 135                     throw new IOException(
 136                             String.format("Error response code %d", http.getResponseCode()));
 137                 }
 138             }
 139         }
 140     }
 141
 142     @Override
 143     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 144         error = null;
 145         try {
 146             backendUrl = Data.profile.get().getUrl();
 147             ltr = ledgerTransactions[0];
 148
 149             int tried = 0;
 150             while (!sendOK()) {
 151                 try {
 152                     tried++;
 153                     if (tried >= 2)
 154                         throw new IOException(String.format("aborting after %d tries", tried));
 155                     sleep(100);
 156                 }
 157                 catch (InterruptedException e) {
 158                     e.printStackTrace();
 159                 }
 160             }
 161         }
 162         catch (Exception e) {
 163             e.printStackTrace();
 164             error = e.getMessage();
 165         }
 166
 167         return null;
 168     }
 169
 170     @Override
 171     protected void onPostExecute(Void aVoid) {
 172         super.onPostExecute(aVoid);
 173         taskCallback.done(error);
 174     }
 175 }