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.Logger;
  32 import net.ktnx.mobileledger.utils.NetworkUtil;
  33 import net.ktnx.mobileledger.utils.UrlEncodedFormData;
  34
  35 import java.io.BufferedReader;
  36 import java.io.IOException;
  37 import java.io.InputStream;
  38 import java.io.InputStreamReader;
  39 import java.io.OutputStream;
  40 import java.net.HttpURLConnection;
  41 import java.nio.charset.StandardCharsets;
  42 import java.util.List;
  43 import java.util.Locale;
  44 import java.util.Map;
  45 import java.util.regex.Matcher;
  46 import java.util.regex.Pattern;
  47
  48 import static android.os.SystemClock.sleep;
  49 import static net.ktnx.mobileledger.utils.Logger.debug;
  50
  51 public class SendTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  52     private final TaskCallback taskCallback;
  53     protected String error;
  54     private String token;
  55     private String session;
  56     private LedgerTransaction ltr;
  57     private MobileLedgerProfile mProfile;
  58     private boolean simulate = false;
  59
  60     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile,
  61                                boolean simulate) {
  62         taskCallback = callback;
  63         mProfile = profile;
  64         this.simulate = simulate;
  65     }
  66     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile) {
  67         taskCallback = callback;
  68         mProfile = profile;
  69         simulate = false;
  70     }
  71     private boolean sendOK() throws IOException {
  72         if (simulate) {
  73             try {
  74                 Thread.sleep(1500);
  75                 if (Math.random() > 0.3)
  76                     throw new RuntimeException("Simulated test exception");
  77             }
  78             catch (InterruptedException ex) {
  79                 Logger.debug("network", ex.toString());
  80             }
  81
  82             return true;
  83         }
  84
  85         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
  86         http.setRequestMethod("PUT");
  87         http.setRequestProperty("Content-Type", "application/json");
  88         http.setRequestProperty("Accept", "*/*");
  89
  90         ParsedLedgerTransaction jsonTransaction;
  91         jsonTransaction = ltr.toParsedLedgerTransaction();
  92         ObjectMapper mapper = new ObjectMapper();
  93         ObjectWriter writer = mapper.writerFor(ParsedLedgerTransaction.class);
  94         String body = writer.writeValueAsString(jsonTransaction);
  95
  96         byte[] bodyBytes = body.getBytes(StandardCharsets.UTF_8);
  97         http.setDoOutput(true);
  98         http.setDoInput(true);
  99         http.addRequestProperty("Content-Length", String.valueOf(bodyBytes.length));
 100
 101         debug("network", "request header: " + http.getRequestProperties()
 102                                                   .toString());
 103
 104         try (OutputStream req = http.getOutputStream()) {
 105             debug("network", "Request body: " + body);
 106             req.write(bodyBytes);
 107
 108             final int responseCode = http.getResponseCode();
 109             debug("network",
 110                     String.format("Response: %d %s", responseCode, http.getResponseMessage()));
 111
 112             try (InputStream resp = http.getErrorStream()) {
 113
 114                 switch (responseCode) {
 115                     case 200:
 116                     case 201:
 117                         break;
 118                     case 405:
 119                         return false; // will cause a retry with the legacy method
 120                     default:
 121                         BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 122                         String line = reader.readLine();
 123                         debug("network", "Response content: " + line);
 124                         throw new IOException(
 125                                 String.format("Error response code %d", responseCode));
 126                 }
 127             }
 128         }
 129
 130         return true;
 131     }
 132     private boolean legacySendOK() throws IOException {
 133         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
 134         http.setRequestMethod("POST");
 135         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 136         http.setRequestProperty("Accept", "*/*");
 137         if ((session != null) && !session.isEmpty()) {
 138             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
 139         }
 140         http.setDoOutput(true);
 141         http.setDoInput(true);
 142
 143         UrlEncodedFormData params = new UrlEncodedFormData();
 144         params.addPair("_formid", "identify-add");
 145         if (token != null)
 146             params.addPair("_token", token);
 147         params.addPair("date", Globals.formatLedgerDate(ltr.getDate()));
 148         params.addPair("description", ltr.getDescription());
 149         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
 150             params.addPair("account", acc.getAccountName());
 151             if (acc.isAmountSet())
 152                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
 153             else
 154                 params.addPair("amount", "");
 155         }
 156
 157         String body = params.toString();
 158         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
 159
 160         debug("network", "request header: " + http.getRequestProperties()
 161                                                   .toString());
 162
 163         try (OutputStream req = http.getOutputStream()) {
 164             debug("network", "Request body: " + body);
 165             req.write(body.getBytes(StandardCharsets.US_ASCII));
 166
 167             try (InputStream resp = http.getInputStream()) {
 168                 debug("update_accounts", String.valueOf(http.getResponseCode()));
 169                 if (http.getResponseCode() == 303) {
 170                     // everything is fine
 171                     return true;
 172                 }
 173                 else if (http.getResponseCode() == 200) {
 174                     // get the new cookie
 175                     {
 176                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
 177
 178                         Map<String, List<String>> header = http.getHeaderFields();
 179                         List<String> cookieHeader = header.get("Set-Cookie");
 180                         if (cookieHeader != null) {
 181                             String cookie = cookieHeader.get(0);
 182                             Matcher m = reSessionCookie.matcher(cookie);
 183                             if (m.matches()) {
 184                                 session = m.group(1);
 185                                 debug("network", "new session is " + session);
 186                             }
 187                             else {
 188                                 debug("network", "set-cookie: " + cookie);
 189                                 Log.w("network",
 190                                         "Response Set-Cookie headers is not a _SESSION one");
 191                             }
 192                         }
 193                         else {
 194                             Log.w("network", "Response has no Set-Cookie header");
 195                         }
 196                     }
 197                     // the token needs to be updated
 198                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 199                     Pattern re = Pattern.compile(
 200                             "<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 201                     String line;
 202                     while ((line = reader.readLine()) != null) {
 203                         //debug("dump", line);
 204                         Matcher m = re.matcher(line);
 205                         if (m.matches()) {
 206                             token = m.group(1);
 207                             debug("save-transaction", line);
 208                             debug("save-transaction", "Token=" + token);
 209                             return false;       // retry
 210                         }
 211                     }
 212                     throw new IOException("Can't find _token string");
 213                 }
 214                 else {
 215                     throw new IOException(
 216                             String.format("Error response code %d", http.getResponseCode()));
 217                 }
 218             }
 219         }
 220     }
 221
 222     @Override
 223     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 224         error = null;
 225         try {
 226             ltr = ledgerTransactions[0];
 227
 228             if (!sendOK()) {
 229                 int tried = 0;
 230                 while (!legacySendOK()) {
 231                     tried++;
 232                     if (tried >= 2)
 233                         throw new IOException(String.format("aborting after %d tries", tried));
 234                     sleep(100);
 235                 }
 236             }
 237         }
 238         catch (Exception e) {
 239             e.printStackTrace();
 240             error = e.getMessage();
 241         }
 242
 243         return null;
 244     }
 245
 246     @Override
 247     protected void onPostExecute(Void aVoid) {
 248         super.onPostExecute(aVoid);
 249         taskCallback.done(error);
 250     }
 251 }