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