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.Date;
  43 import java.util.GregorianCalendar;
  44 import java.util.List;
  45 import java.util.Locale;
  46 import java.util.Map;
  47 import java.util.regex.Matcher;
  48 import java.util.regex.Pattern;
  49
  50 import static android.os.SystemClock.sleep;
  51 import static net.ktnx.mobileledger.utils.Logger.debug;
  52
  53 public class SendTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  54     private final TaskCallback taskCallback;
  55     protected String error;
  56     private String token;
  57     private String session;
  58     private LedgerTransaction ltr;
  59     private MobileLedgerProfile mProfile;
  60     private boolean simulate = false;
  61
  62     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile,
  63                                boolean simulate) {
  64         taskCallback = callback;
  65         mProfile = profile;
  66         this.simulate = simulate;
  67     }
  68     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile) {
  69         taskCallback = callback;
  70         mProfile = profile;
  71         simulate = false;
  72     }
  73     private boolean sendOK() throws IOException {
  74         if (simulate) {
  75             try {
  76                 Thread.sleep(1500);
  77                 if (Math.random() > 0.3)
  78                     throw new RuntimeException("Simulated test exception");
  79             }
  80             catch (InterruptedException ex) {
  81                 Logger.debug("network", ex.toString());
  82             }
  83
  84             return true;
  85         }
  86
  87         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
  88         http.setRequestMethod("PUT");
  89         http.setRequestProperty("Content-Type", "application/json");
  90         http.setRequestProperty("Accept", "*/*");
  91
  92         ParsedLedgerTransaction jsonTransaction;
  93         jsonTransaction = ltr.toParsedLedgerTransaction();
  94         ObjectMapper mapper = new ObjectMapper();
  95         ObjectWriter writer = mapper.writerFor(ParsedLedgerTransaction.class);
  96         String body = writer.writeValueAsString(jsonTransaction);
  97
  98         byte[] bodyBytes = body.getBytes(StandardCharsets.UTF_8);
  99         http.setDoOutput(true);
 100         http.setDoInput(true);
 101         http.addRequestProperty("Content-Length", String.valueOf(bodyBytes.length));
 102
 103         debug("network", "request header: " + http.getRequestProperties()
 104                                                   .toString());
 105
 106         try (OutputStream req = http.getOutputStream()) {
 107             debug("network", "Request body: " + body);
 108             req.write(bodyBytes);
 109
 110             final int responseCode = http.getResponseCode();
 111             debug("network",
 112                     String.format("Response: %d %s", responseCode, http.getResponseMessage()));
 113
 114             try (InputStream resp = http.getErrorStream()) {
 115
 116                 switch (responseCode) {
 117                     case 200:
 118                     case 201:
 119                         break;
 120                     case 405:
 121                         return false; // will cause a retry with the legacy method
 122                     default:
 123                         BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 124                         String line = reader.readLine();
 125                         debug("network", "Response content: " + line);
 126                         throw new IOException(
 127                                 String.format("Error response code %d", responseCode));
 128                 }
 129             }
 130         }
 131
 132         return true;
 133     }
 134     private boolean legacySendOK() throws IOException {
 135         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
 136         http.setRequestMethod("POST");
 137         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 138         http.setRequestProperty("Accept", "*/*");
 139         if ((session != null) && !session.isEmpty()) {
 140             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
 141         }
 142         http.setDoOutput(true);
 143         http.setDoInput(true);
 144
 145         UrlEncodedFormData params = new UrlEncodedFormData();
 146         params.addPair("_formid", "identify-add");
 147         if (token != null)
 148             params.addPair("_token", token);
 149
 150         Date transactionDate = ltr.getDate();
 151         if (transactionDate == null) {
 152             transactionDate = new GregorianCalendar().getTime();
 153         }
 154
 155         params.addPair("date", Globals.formatLedgerDate(transactionDate));
 156         params.addPair("description", ltr.getDescription());
 157         for (LedgerTransactionAccount acc : ltr.getAccounts()) {
 158             params.addPair("account", acc.getAccountName());
 159             if (acc.isAmountSet())
 160                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
 161             else
 162                 params.addPair("amount", "");
 163         }
 164
 165         String body = params.toString();
 166         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
 167
 168         debug("network", "request header: " + http.getRequestProperties()
 169                                                   .toString());
 170
 171         try (OutputStream req = http.getOutputStream()) {
 172             debug("network", "Request body: " + body);
 173             req.write(body.getBytes(StandardCharsets.US_ASCII));
 174
 175             try (InputStream resp = http.getInputStream()) {
 176                 debug("update_accounts", String.valueOf(http.getResponseCode()));
 177                 if (http.getResponseCode() == 303) {
 178                     // everything is fine
 179                     return true;
 180                 }
 181                 else if (http.getResponseCode() == 200) {
 182                     // get the new cookie
 183                     {
 184                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
 185
 186                         Map<String, List<String>> header = http.getHeaderFields();
 187                         List<String> cookieHeader = header.get("Set-Cookie");
 188                         if (cookieHeader != null) {
 189                             String cookie = cookieHeader.get(0);
 190                             Matcher m = reSessionCookie.matcher(cookie);
 191                             if (m.matches()) {
 192                                 session = m.group(1);
 193                                 debug("network", "new session is " + session);
 194                             }
 195                             else {
 196                                 debug("network", "set-cookie: " + cookie);
 197                                 Log.w("network",
 198                                         "Response Set-Cookie headers is not a _SESSION one");
 199                             }
 200                         }
 201                         else {
 202                             Log.w("network", "Response has no Set-Cookie header");
 203                         }
 204                     }
 205                     // the token needs to be updated
 206                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 207                     Pattern re = Pattern.compile(
 208                             "<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 209                     String line;
 210                     while ((line = reader.readLine()) != null) {
 211                         //debug("dump", line);
 212                         Matcher m = re.matcher(line);
 213                         if (m.matches()) {
 214                             token = m.group(1);
 215                             debug("save-transaction", line);
 216                             debug("save-transaction", "Token=" + token);
 217                             return false;       // retry
 218                         }
 219                     }
 220                     throw new IOException("Can't find _token string");
 221                 }
 222                 else {
 223                     throw new IOException(
 224                             String.format("Error response code %d", http.getResponseCode()));
 225                 }
 226             }
 227         }
 228     }
 229
 230     @Override
 231     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 232         error = null;
 233         try {
 234             ltr = ledgerTransactions[0];
 235
 236             if (!sendOK()) {
 237                 int tried = 0;
 238                 while (!legacySendOK()) {
 239                     tried++;
 240                     if (tried >= 2)
 241                         throw new IOException(String.format("aborting after %d tries", tried));
 242                     sleep(100);
 243                 }
 244             }
 245         }
 246         catch (Exception e) {
 247             e.printStackTrace();
 248             error = e.getMessage();
 249         }
 250
 251         return null;
 252     }
 253
 254     @Override
 255     protected void onPostExecute(Void aVoid) {
 256         super.onPostExecute(aVoid);
 257         taskCallback.done(error);
 258     }
 259 }