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