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

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe 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  * MoLe 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 MoLe. 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 com.fasterxml.jackson.databind.ObjectMapper;
  24 import com.fasterxml.jackson.databind.ObjectWriter;
  25
  26 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  27 import net.ktnx.mobileledger.model.LedgerTransaction;
  28 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  29 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  30 import net.ktnx.mobileledger.utils.Globals;
  31 import net.ktnx.mobileledger.utils.NetworkUtil;
  32 import net.ktnx.mobileledger.utils.UrlEncodedFormData;
  33
  34 import java.io.BufferedReader;
  35 import java.io.IOException;
  36 import java.io.InputStream;
  37 import java.io.InputStreamReader;
  38 import java.io.OutputStream;
  39 import java.net.HttpURLConnection;
  40 import java.nio.charset.StandardCharsets;
  41 import java.util.List;
  42 import java.util.Locale;
  43 import java.util.Map;
  44 import java.util.regex.Matcher;
  45 import java.util.regex.Pattern;
  46
  47 import static android.os.SystemClock.sleep;
  48 import static net.ktnx.mobileledger.utils.Logger.debug;
  49
  50 public class SendTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  51     private final TaskCallback taskCallback;
  52     protected String error;
  53     private String token;
  54     private String session;
  55     private LedgerTransaction ltr;
  56     private MobileLedgerProfile mProfile;
  57
  58     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile) {
  59         taskCallback = callback;
  60         mProfile = profile;
  61     }
  62     private boolean sendOK() throws IOException {
  63 //        if (BuildConfig.DEBUG) {
  64 //            try {
  65 //                Thread.sleep(1500);
  66 //                if (Math.random() > 0.3)
  67 //                    throw new RuntimeException("Simulated test exception");
  68 //            }
  69 //            catch (InterruptedException ex) {
  70 //                Logger.debug("network", ex.toString());
  71 //            }
  72 //
  73 //            return true;
  74 //        }
  75
  76         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
  77         http.setRequestMethod("PUT");
  78         http.setRequestProperty("Content-Type", "application/json");
  79         http.setRequestProperty("Accept", "*/*");
  80
  81         ParsedLedgerTransaction jsonTransaction;
  82         jsonTransaction = ltr.toParsedLedgerTransaction();
  83         ObjectMapper mapper = new ObjectMapper();
  84         ObjectWriter writer = mapper.writerFor(ParsedLedgerTransaction.class);
  85         String body = writer.writeValueAsString(jsonTransaction);
  86
  87         byte[] bodyBytes = body.getBytes(StandardCharsets.UTF_8);
  88         http.setDoOutput(true);
  89         http.setDoInput(true);
  90         http.addRequestProperty("Content-Length", String.valueOf(bodyBytes.length));
  91
  92         debug("network", "request header: " + http.getRequestProperties()
  93                                                   .toString());
  94
  95         try (OutputStream req = http.getOutputStream()) {
  96             debug("network", "Request body: " + body);
  97             req.write(bodyBytes);
  98
  99             final int responseCode = http.getResponseCode();
 100             debug("network",
 101                     String.format("Response: %d %s", responseCode, http.getResponseMessage()));
 102
 103             try (InputStream resp = http.getErrorStream()) {
 104
 105                 switch (responseCode) {
 106                     case 200:
 107                     case 201:
 108                         break;
 109                     case 405:
 110                         return false; // will cause a retry with the legacy method
 111                     default:
 112                         BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 113                         String line = reader.readLine();
 114                         debug("network", "Response content: " + line);
 115                         throw new IOException(
 116                                 String.format("Error response code %d", responseCode));
 117                 }
 118             }
 119         }
 120
 121         return true;
 122     }
 123     private boolean legacySendOK() throws IOException {
 124         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
 125         http.setRequestMethod("POST");
 126         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 127         http.setRequestProperty("Accept", "*/*");
 128         if ((session != null) && !session.isEmpty()) {
 129             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
 130         }
 131         http.setDoOutput(true);
 132         http.setDoInput(true);
 133
 134         UrlEncodedFormData params = new UrlEncodedFormData();
 135         params.addPair("_formid", "identify-add");
 136         if (token != null)
 137             params.addPair("_token", token);
 138         params.addPair("date", Globals.formatLedgerDate(ltr.getDate()));
 139         params.addPair("description", ltr.getDescription());
 140         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
 141             params.addPair("account", acc.getAccountName());
 142             if (acc.isAmountSet())
 143                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
 144             else
 145                 params.addPair("amount", "");
 146         }
 147
 148         String body = params.toString();
 149         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
 150
 151         debug("network", "request header: " + http.getRequestProperties()
 152                                                   .toString());
 153
 154         try (OutputStream req = http.getOutputStream()) {
 155             debug("network", "Request body: " + body);
 156             req.write(body.getBytes(StandardCharsets.US_ASCII));
 157
 158             try (InputStream resp = http.getInputStream()) {
 159                 debug("update_accounts", String.valueOf(http.getResponseCode()));
 160                 if (http.getResponseCode() == 303) {
 161                     // everything is fine
 162                     return true;
 163                 }
 164                 else if (http.getResponseCode() == 200) {
 165                     // get the new cookie
 166                     {
 167                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
 168
 169                         Map<String, List<String>> header = http.getHeaderFields();
 170                         List<String> cookieHeader = header.get("Set-Cookie");
 171                         if (cookieHeader != null) {
 172                             String cookie = cookieHeader.get(0);
 173                             Matcher m = reSessionCookie.matcher(cookie);
 174                             if (m.matches()) {
 175                                 session = m.group(1);
 176                                 debug("network", "new session is " + session);
 177                             }
 178                             else {
 179                                 debug("network", "set-cookie: " + cookie);
 180                                 Log.w("network",
 181                                         "Response Set-Cookie headers is not a _SESSION one");
 182                             }
 183                         }
 184                         else {
 185                             Log.w("network", "Response has no Set-Cookie header");
 186                         }
 187                     }
 188                     // the token needs to be updated
 189                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 190                     Pattern re = Pattern.compile(
 191                             "<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 192                     String line;
 193                     while ((line = reader.readLine()) != null) {
 194                         //debug("dump", line);
 195                         Matcher m = re.matcher(line);
 196                         if (m.matches()) {
 197                             token = m.group(1);
 198                             debug("save-transaction", line);
 199                             debug("save-transaction", "Token=" + token);
 200                             return false;       // retry
 201                         }
 202                     }
 203                     throw new IOException("Can't find _token string");
 204                 }
 205                 else {
 206                     throw new IOException(
 207                             String.format("Error response code %d", http.getResponseCode()));
 208                 }
 209             }
 210         }
 211     }
 212
 213     @Override
 214     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 215         error = null;
 216         try {
 217             ltr = ledgerTransactions[0];
 218
 219             if (!sendOK()) {
 220                 int tried = 0;
 221                 while (!legacySendOK()) {
 222                     tried++;
 223                     if (tried >= 2)
 224                         throw new IOException(String.format("aborting after %d tries", tried));
 225                     sleep(100);
 226                 }
 227             }
 228         }
 229         catch (Exception e) {
 230             e.printStackTrace();
 231             error = e.getMessage();
 232         }
 233
 234         return null;
 235     }
 236
 237     @Override
 238     protected void onPostExecute(Void aVoid) {
 239         super.onPostExecute(aVoid);
 240         taskCallback.done(error);
 241     }
 242 }