app/src/main/java/net/ktnx/mobileledger/async/SendTransactionTask.java

   1 /*
   2  * Copyright © 2020 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.content.res.Resources;
  21 import android.os.AsyncTask;
  22 import android.util.Log;
  23 import android.util.SparseArray;
  24
  25 import com.fasterxml.jackson.databind.ObjectMapper;
  26 import com.fasterxml.jackson.databind.ObjectWriter;
  27
  28 import net.ktnx.mobileledger.R;
  29 import net.ktnx.mobileledger.model.LedgerTransaction;
  30 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  31 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  32 import net.ktnx.mobileledger.utils.Globals;
  33 import net.ktnx.mobileledger.utils.Logger;
  34 import net.ktnx.mobileledger.utils.NetworkUtil;
  35 import net.ktnx.mobileledger.utils.SimpleDate;
  36 import net.ktnx.mobileledger.utils.UrlEncodedFormData;
  37
  38 import java.io.BufferedReader;
  39 import java.io.IOException;
  40 import java.io.InputStream;
  41 import java.io.InputStreamReader;
  42 import java.io.OutputStream;
  43 import java.net.HttpURLConnection;
  44 import java.nio.charset.StandardCharsets;
  45 import java.util.List;
  46 import java.util.Locale;
  47 import java.util.Map;
  48 import java.util.regex.Matcher;
  49 import java.util.regex.Pattern;
  50
  51 import static android.os.SystemClock.sleep;
  52 import static net.ktnx.mobileledger.utils.Logger.debug;
  53
  54 /* TODO: get rid of the custom session/cookie and auth code?
  55  *       (the last problem with the POST was the missing content-length header)
  56  *       This will resolve itself when hledger-web 1.14+ is released with Debian/stable,
  57  *       at which point the HTML form emulation can be dropped entirely
  58  */
  59
  60 public class SendTransactionTask extends AsyncTask<LedgerTransaction, Void, Void> {
  61     private final TaskCallback taskCallback;
  62     protected String error;
  63     private String token;
  64     private String session;
  65     private LedgerTransaction transaction;
  66     private final MobileLedgerProfile mProfile;
  67     private final boolean simulate;
  68
  69     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile,
  70                                boolean simulate) {
  71         taskCallback = callback;
  72         mProfile = profile;
  73         this.simulate = simulate;
  74     }
  75     public SendTransactionTask(TaskCallback callback, MobileLedgerProfile profile) {
  76         taskCallback = callback;
  77         mProfile = profile;
  78         simulate = false;
  79     }
  80     private boolean send_1_15_OK() throws IOException {
  81         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
  82         http.setRequestMethod("PUT");
  83         http.setRequestProperty("Content-Type", "application/json");
  84         http.setRequestProperty("Accept", "*/*");
  85
  86         net.ktnx.mobileledger.json.v1_15.ParsedLedgerTransaction jsonTransaction =
  87                 net.ktnx.mobileledger.json.v1_15.ParsedLedgerTransaction.fromLedgerTransaction(
  88                         transaction);
  89         ObjectMapper mapper = new ObjectMapper();
  90         ObjectWriter writer =
  91                 mapper.writerFor(net.ktnx.mobileledger.json.v1_15.ParsedLedgerTransaction.class);
  92         String body = writer.writeValueAsString(jsonTransaction);
  93
  94         return sendRequest(http, body);
  95     }
  96     private boolean send_1_14_OK() throws IOException {
  97         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
  98         http.setRequestMethod("PUT");
  99         http.setRequestProperty("Content-Type", "application/json");
 100         http.setRequestProperty("Accept", "*/*");
 101
 102         net.ktnx.mobileledger.json.v1_14.ParsedLedgerTransaction jsonTransaction =
 103                 net.ktnx.mobileledger.json.v1_14.ParsedLedgerTransaction.fromLedgerTransaction(
 104                         transaction);
 105         ObjectMapper mapper = new ObjectMapper();
 106         ObjectWriter writer =
 107                 mapper.writerFor(net.ktnx.mobileledger.json.v1_14.ParsedLedgerTransaction.class);
 108         String body = writer.writeValueAsString(jsonTransaction);
 109
 110         return sendRequest(http, body);
 111     }
 112     private boolean sendRequest(HttpURLConnection http, String body) throws IOException {
 113         if (simulate) {
 114             debug("network", "The request would be: " + body);
 115             try {
 116                 Thread.sleep(1500);
 117                 if (Math.random() > 0.3)
 118                     throw new RuntimeException("Simulated test exception");
 119             }
 120             catch (InterruptedException ex) {
 121                 Logger.debug("network", ex.toString());
 122             }
 123
 124             return true;
 125         }
 126
 127         byte[] bodyBytes = body.getBytes(StandardCharsets.UTF_8);
 128         http.setDoOutput(true);
 129         http.setDoInput(true);
 130         http.addRequestProperty("Content-Length", String.valueOf(bodyBytes.length));
 131
 132         debug("network", "request header: " + http.getRequestProperties()
 133                                                   .toString());
 134
 135         try (OutputStream req = http.getOutputStream()) {
 136             debug("network", "Request body: " + body);
 137             req.write(bodyBytes);
 138
 139             final int responseCode = http.getResponseCode();
 140             debug("network", String.format(Locale.US, "Response: %d %s", responseCode,
 141                     http.getResponseMessage()));
 142
 143             try (InputStream resp = http.getErrorStream()) {
 144
 145                 switch (responseCode) {
 146                     case 200:
 147                     case 201:
 148                         break;
 149                     case 400:
 150                     case 405:
 151                         return false; // will cause a retry with the legacy method
 152                     default:
 153                         BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 154                         String line = reader.readLine();
 155                         debug("network", "Response content: " + line);
 156                         throw new IOException(
 157                                 String.format("Error response code %d", responseCode));
 158                 }
 159             }
 160         }
 161
 162         return true;
 163     }
 164     private boolean legacySendOK() throws IOException {
 165         HttpURLConnection http = NetworkUtil.prepareConnection(mProfile, "add");
 166         http.setRequestMethod("POST");
 167         http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 168         http.setRequestProperty("Accept", "*/*");
 169         if ((session != null) && !session.isEmpty()) {
 170             http.setRequestProperty("Cookie", String.format("_SESSION=%s", session));
 171         }
 172         http.setDoOutput(true);
 173         http.setDoInput(true);
 174
 175         UrlEncodedFormData params = new UrlEncodedFormData();
 176         params.addPair("_formid", "identify-add");
 177         if (token != null)
 178             params.addPair("_token", token);
 179
 180         SimpleDate transactionDate = transaction.getDateIfAny();
 181         if (transactionDate == null)
 182             transactionDate = SimpleDate.today();
 183
 184         params.addPair("date", Globals.formatLedgerDate(transactionDate));
 185         params.addPair("description", transaction.getDescription());
 186         for (LedgerTransactionAccount acc : transaction.getAccounts()) {
 187             params.addPair("account", acc.getAccountName());
 188             if (acc.isAmountSet())
 189                 params.addPair("amount", String.format(Locale.US, "%1.2f", acc.getAmount()));
 190             else
 191                 params.addPair("amount", "");
 192         }
 193
 194         String body = params.toString();
 195         http.addRequestProperty("Content-Length", String.valueOf(body.length()));
 196
 197         debug("network", "request header: " + http.getRequestProperties()
 198                                                   .toString());
 199
 200         try (OutputStream req = http.getOutputStream()) {
 201             debug("network", "Request body: " + body);
 202             req.write(body.getBytes(StandardCharsets.US_ASCII));
 203
 204             try (InputStream resp = http.getInputStream()) {
 205                 debug("update_accounts", String.valueOf(http.getResponseCode()));
 206                 if (http.getResponseCode() == 303) {
 207                     // everything is fine
 208                     return true;
 209                 }
 210                 else if (http.getResponseCode() == 200) {
 211                     // get the new cookie
 212                     {
 213                         Pattern reSessionCookie = Pattern.compile("_SESSION=([^;]+);.*");
 214
 215                         Map<String, List<String>> header = http.getHeaderFields();
 216                         List<String> cookieHeader = header.get("Set-Cookie");
 217                         if (cookieHeader != null) {
 218                             String cookie = cookieHeader.get(0);
 219                             Matcher m = reSessionCookie.matcher(cookie);
 220                             if (m.matches()) {
 221                                 session = m.group(1);
 222                                 debug("network", "new session is " + session);
 223                             }
 224                             else {
 225                                 debug("network", "set-cookie: " + cookie);
 226                                 Log.w("network",
 227                                         "Response Set-Cookie headers is not a _SESSION one");
 228                             }
 229                         }
 230                         else {
 231                             Log.w("network", "Response has no Set-Cookie header");
 232                         }
 233                     }
 234                     // the token needs to be updated
 235                     BufferedReader reader = new BufferedReader(new InputStreamReader(resp));
 236                     Pattern re = Pattern.compile(
 237                             "<input type=\"hidden\" name=\"_token\" value=\"([^\"]+)\">");
 238                     String line;
 239                     while ((line = reader.readLine()) != null) {
 240                         //debug("dump", line);
 241                         Matcher m = re.matcher(line);
 242                         if (m.matches()) {
 243                             token = m.group(1);
 244                             debug("save-transaction", line);
 245                             debug("save-transaction", "Token=" + token);
 246                             return false;       // retry
 247                         }
 248                     }
 249                     throw new IOException("Can't find _token string");
 250                 }
 251                 else {
 252                     throw new IOException(
 253                             String.format("Error response code %d", http.getResponseCode()));
 254                 }
 255             }
 256         }
 257     }
 258     @Override
 259     protected Void doInBackground(LedgerTransaction... ledgerTransactions) {
 260         error = null;
 261         try {
 262             transaction = ledgerTransactions[0];
 263
 264             switch (mProfile.getApiVersion()) {
 265                 case auto:
 266                     Logger.debug("network", "Trying version 1.5.");
 267                     if (!send_1_15_OK()) {
 268                         Logger.debug("network", "Version 1.5 request failed. Trying with 1.14");
 269                         if (!send_1_14_OK()) {
 270                             Logger.debug("network",
 271                                     "Version 1.14 failed too. Trying HTML form emulation");
 272                             legacySendOkWithRetry();
 273                         }
 274                         else {
 275                             Logger.debug("network", "Version 1.14 request succeeded");
 276                         }
 277                     }
 278                     else {
 279                         Logger.debug("network", "Version 1.15 request succeeded");
 280                     }
 281                     break;
 282                 case html:
 283                     legacySendOkWithRetry();
 284                     break;
 285                 case pre_1_15:
 286                     send_1_14_OK();
 287                     break;
 288                 case post_1_14:
 289                     send_1_15_OK();
 290                     break;
 291                 default:
 292                     throw new IllegalStateException(
 293                             "Unexpected API version: " + mProfile.getApiVersion());
 294             }
 295         }
 296         catch (Exception e) {
 297             e.printStackTrace();
 298             error = e.getMessage();
 299         }
 300
 301         return null;
 302     }
 303     private void legacySendOkWithRetry() throws IOException {
 304         int tried = 0;
 305         while (!legacySendOK()) {
 306             tried++;
 307             if (tried >= 2)
 308                 throw new IOException(String.format("aborting after %d tries", tried));
 309             sleep(100);
 310         }
 311     }
 312     @Override
 313     protected void onPostExecute(Void aVoid) {
 314         super.onPostExecute(aVoid);
 315         taskCallback.done(error);
 316     }
 317
 318     public enum API {
 319         auto(0), html(-1), pre_1_15(-2), post_1_14(-3);
 320         private static final SparseArray<API> map = new SparseArray<>();
 321
 322         static {
 323             for (API item : API.values()) {
 324                 map.put(item.value, item);
 325             }
 326         }
 327
 328         private int value;
 329
 330         API(int value) {
 331             this.value = value;
 332         }
 333         public static API valueOf(int i) {
 334             return map.get(i, auto);
 335         }
 336         public int toInt() {
 337             return this.value;
 338         }
 339         public String getDescription(Resources resources) {
 340             switch (this) {
 341                 case auto:
 342                     return resources.getString(R.string.api_auto);
 343                 case html:
 344                     return resources.getString(R.string.api_html);
 345                 case pre_1_15:
 346                     return resources.getString(R.string.api_pre_1_15);
 347                 case post_1_14:
 348                     return resources.getString(R.string.api_post_1_14);
 349                 default:
 350                     throw new IllegalStateException("Unexpected value: " + value);
 351             }
 352         }
 353     }
 354 }