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

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger 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  * Mobile-Ledger 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 Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.content.SharedPreferences;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.OperationCanceledException;
  23 import android.util.Log;
  24
  25 import net.ktnx.mobileledger.R;
  26 import net.ktnx.mobileledger.model.Data;
  27 import net.ktnx.mobileledger.model.LedgerAccount;
  28 import net.ktnx.mobileledger.ui.activity.MainActivity;
  29 import net.ktnx.mobileledger.utils.MLDB;
  30 import net.ktnx.mobileledger.utils.NetworkUtil;
  31
  32 import java.io.BufferedReader;
  33 import java.io.FileNotFoundException;
  34 import java.io.IOException;
  35 import java.io.InputStream;
  36 import java.io.InputStreamReader;
  37 import java.lang.ref.WeakReference;
  38 import java.net.HttpURLConnection;
  39 import java.net.MalformedURLException;
  40 import java.net.URLDecoder;
  41 import java.util.regex.Matcher;
  42 import java.util.regex.Pattern;
  43
  44 public class RetrieveAccountsTask extends android.os.AsyncTask<Void, Integer, Void> {
  45     int error;
  46     WeakReference<MainActivity> mContext;
  47     private SharedPreferences pref;
  48
  49     public RetrieveAccountsTask(WeakReference<MainActivity> context) {
  50         mContext = context;
  51         error = 0;
  52     }
  53
  54     public void setPref(SharedPreferences pref) {
  55         this.pref = pref;
  56     }
  57
  58     protected Void doInBackground(Void... params) {
  59         Data.backgroundTaskCount.incrementAndGet();
  60         try {
  61             HttpURLConnection http = NetworkUtil.prepare_connection(pref, "add");
  62             publishProgress(0);
  63             try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
  64                 try (InputStream resp = http.getInputStream()) {
  65                     Log.d("update_accounts", String.valueOf(http.getResponseCode()));
  66                     if (http.getResponseCode() != 200) {
  67                         throw new IOException(
  68                                 String.format("HTTP error: %d %s", http.getResponseCode(),
  69                                         http.getResponseMessage()));
  70                     }
  71                     else {
  72                         if (db.inTransaction()) throw new AssertionError();
  73
  74                         db.beginTransaction();
  75
  76                         try {
  77                             db.execSQL("update account_values set keep=0;");
  78                             db.execSQL("update accounts set keep=0;");
  79
  80                             String line;
  81                             String last_account_name = null;
  82                             BufferedReader buf =
  83                                     new BufferedReader(new InputStreamReader(resp, "UTF-8"));
  84                             // %3A is '='
  85                             Pattern account_name_re =
  86                                     Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  87                             Pattern account_value_re = Pattern.compile(
  88                                     "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  89                             Pattern tr_end_re = Pattern.compile("</tr>");
  90                             Pattern descriptions_line_re =
  91                                     Pattern.compile("\\bdescriptionsSuggester\\s*=\\s*new\\b");
  92                             Pattern description_items_re =
  93                                     Pattern.compile("\"value\":\"([^\"]+)\"");
  94                             int count = 0;
  95                             while ((line = buf.readLine()) != null) {
  96                                 throwIfCancelled();
  97
  98                                 Matcher m = account_name_re.matcher(line);
  99                                 if (m.find()) {
 100                                     String acct_encoded = m.group(1);
 101                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 102                                     acct_name = acct_name.replace("\"", "");
 103                                     Log.d("account-parser", acct_name);
 104
 105                                     addAccount(db, acct_name);
 106                                     publishProgress(++count);
 107
 108                                     last_account_name = acct_name;
 109
 110                                     continue;
 111                                 }
 112
 113                                 Matcher tr_m = tr_end_re.matcher(line);
 114                                 if (tr_m.find()) {
 115                                     Log.d("account-parser", "<tr> - another account expected");
 116                                     last_account_name = null;
 117                                     continue;
 118                                 }
 119
 120                                 if (last_account_name != null) {
 121                                     m = account_value_re.matcher(line);
 122                                     boolean match_found = false;
 123                                     while (m.find()) {
 124                                         throwIfCancelled();
 125
 126                                         match_found = true;
 127                                         String value = m.group(1);
 128                                         String currency = m.group(2);
 129                                         if (currency == null) currency = "";
 130                                         value = value.replace(',', '.');
 131                                         Log.d("db", "curr=" + currency + ", value=" + value);
 132                                         db.execSQL(
 133                                                 "insert or replace into account_values(account, currency, value, keep) values(?, ?, ?, 1);",
 134                                                 new Object[]{last_account_name, currency,
 135                                                              Float.valueOf(value)
 136                                                 });
 137                                     }
 138
 139                                     if (match_found) continue;
 140                                 }
 141
 142                                 m = descriptions_line_re.matcher(line);
 143                                 if (m.find()) {
 144                                     db.execSQL("update description_history set keep=0;");
 145                                     m = description_items_re.matcher(line);
 146                                     while (m.find()) {
 147                                         throwIfCancelled();
 148
 149                                         String description = m.group(1);
 150                                         if (description.isEmpty()) continue;
 151
 152                                         Log.d("db", String.format("Stored description: %s",
 153                                                 description));
 154                                         db.execSQL("insert or replace into description_history" +
 155                                                    "(description, description_upper, keep) " +
 156                                                    "values(?, ?, 1);",
 157                                                 new Object[]{description, description.toUpperCase()
 158                                                 });
 159                                     }
 160                                 }
 161                             }
 162
 163                             db.execSQL("delete from account_values where keep=0;");
 164                             db.execSQL("delete from accounts where keep=0;");
 165                             db.setTransactionSuccessful();
 166                         }
 167                         catch (OperationCanceledException e) {
 168                             Log.w("async", "Account retrieval cancelled");
 169                         }
 170                         finally {
 171                             db.endTransaction();
 172                         }
 173                     }
 174                 }
 175             }
 176         }
 177         catch (MalformedURLException e) {
 178             error = R.string.err_bad_backend_url;
 179             e.printStackTrace();
 180         }
 181         catch (FileNotFoundException e) {
 182             error = R.string.err_bad_auth;
 183             e.printStackTrace();
 184         }
 185         catch (IOException e) {
 186             error = R.string.err_net_io_error;
 187             e.printStackTrace();
 188         }
 189         catch (Exception e) {
 190             error = R.string.err_net_error;
 191             e.printStackTrace();
 192         }
 193         finally {
 194             Log.d("RAT", "decrementing background task count");
 195             Data.backgroundTaskCount.decrementAndGet();
 196         }
 197
 198         return null;
 199     }
 200     private void throwIfCancelled() {
 201         if (isCancelled()) throw new OperationCanceledException(null);
 202     }
 203
 204     private void addAccount(SQLiteDatabase db, String name) {
 205         do {
 206             LedgerAccount acc = new LedgerAccount(name);
 207             db.execSQL("update accounts set level = ?, keep = 1 where name = ?",
 208                     new Object[]{acc.getLevel(), name});
 209             db.execSQL("insert into accounts(name, name_upper, parent_name, level) select ?,?," +
 210                        "?,? " + "where (select changes() = 0)",
 211                     new Object[]{name, name.toUpperCase(), acc.getParentName(), acc.getLevel()});
 212             name = acc.getParentName();
 213         } while (name != null);
 214     }
 215     @Override
 216     protected void onPostExecute(Void result) {
 217         MainActivity ctx = mContext.get();
 218         if (ctx == null) return;
 219         ctx.onRetrieveDone(this.error == 0);
 220     }
 221
 222 }