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