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.LedgerAccount;
  27 import net.ktnx.mobileledger.ui.account_summary.AccountSummaryFragment;
  28 import net.ktnx.mobileledger.utils.MLDB;
  29 import net.ktnx.mobileledger.utils.NetworkUtil;
  30
  31 import java.io.BufferedReader;
  32 import java.io.FileNotFoundException;
  33 import java.io.IOException;
  34 import java.io.InputStream;
  35 import java.io.InputStreamReader;
  36 import java.lang.ref.WeakReference;
  37 import java.net.HttpURLConnection;
  38 import java.net.MalformedURLException;
  39 import java.net.URLDecoder;
  40 import java.util.regex.Matcher;
  41 import java.util.regex.Pattern;
  42
  43 public class RetrieveAccountsTask extends android.os.AsyncTask<Void, Integer, Void> {
  44     int error;
  45     WeakReference<AccountSummaryFragment> mContext;
  46     private SharedPreferences pref;
  47
  48     public RetrieveAccountsTask(WeakReference<AccountSummaryFragment> context) {
  49         mContext = context;
  50         error = 0;
  51     }
  52
  53     public void setPref(SharedPreferences pref) {
  54         this.pref = pref;
  55     }
  56
  57     protected Void doInBackground(Void... params) {
  58         try {
  59             HttpURLConnection http = NetworkUtil.prepare_connection(pref, "add");
  60             publishProgress(0);
  61             try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
  62                 try (InputStream resp = http.getInputStream()) {
  63                     Log.d("update_accounts", String.valueOf(http.getResponseCode()));
  64                     if (http.getResponseCode() != 200) {
  65                         throw new IOException(
  66                                 String.format("HTTP error: %d %s", http.getResponseCode(),
  67                                         http.getResponseMessage()));
  68                     }
  69                     else {
  70                         if (db.inTransaction()) throw new AssertionError();
  71
  72                         db.beginTransaction();
  73
  74                         try {
  75                             db.execSQL("update account_values set keep=0;");
  76                             db.execSQL("update accounts set keep=0;");
  77
  78                             String line;
  79                             String last_account_name = null;
  80                             BufferedReader buf =
  81                                     new BufferedReader(new InputStreamReader(resp, "UTF-8"));
  82                             // %3A is '='
  83                             Pattern account_name_re =
  84                                     Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  85                             Pattern value_re = Pattern.compile(
  86                                     "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  87                             Pattern tr_re = Pattern.compile("</tr>");
  88                             Pattern descriptions_line_re =
  89                                     Pattern.compile("\\bdescriptionsSuggester\\s*=\\s*new\\b");
  90                             Pattern description_items_re =
  91                                     Pattern.compile("\"value\":\"([^\"]+)\"");
  92                             int count = 0;
  93                             while ((line = buf.readLine()) != null) {
  94                                 throwIfCancelled();
  95
  96                                 Matcher m = account_name_re.matcher(line);
  97                                 if (m.find()) {
  98                                     String acct_encoded = m.group(1);
  99                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 100                                     acct_name = acct_name.replace("\"", "");
 101                                     Log.d("account-parser", acct_name);
 102
 103                                     addAccount(db, acct_name);
 104                                     publishProgress(++count);
 105
 106                                     last_account_name = acct_name;
 107
 108                                     continue;
 109                                 }
 110
 111                                 Matcher tr_m = tr_re.matcher(line);
 112                                 if (tr_m.find()) {
 113                                     Log.d("account-parser", "<tr> - another account expected");
 114                                     last_account_name = null;
 115                                     continue;
 116                                 }
 117
 118                                 if (last_account_name != null) {
 119                                     m = value_re.matcher(line);
 120                                     boolean match_found = false;
 121                                     while (m.find()) {
 122                                         throwIfCancelled();
 123
 124                                         match_found = true;
 125                                         String value = m.group(1);
 126                                         String currency = m.group(2);
 127                                         if (currency == null) currency = "";
 128                                         value = value.replace(',', '.');
 129                                         Log.d("db", "curr=" + currency + ", value=" + value);
 130                                         db.execSQL(
 131                                                 "insert or replace into account_values(account, currency, value, keep) values(?, ?, ?, 1);",
 132                                                 new Object[]{last_account_name, currency,
 133                                                              Float.valueOf(value)
 134                                                 });
 135                                     }
 136
 137                                     if (match_found) continue;
 138                                 }
 139
 140                                 m = descriptions_line_re.matcher(line);
 141                                 if (m.find()) {
 142                                     db.execSQL("update description_history set keep=0;");
 143                                     m = description_items_re.matcher(line);
 144                                     while (m.find()) {
 145                                         throwIfCancelled();
 146
 147                                         String description = m.group(1);
 148                                         if (description.isEmpty()) continue;
 149
 150                                         Log.d("db", String.format("Stored description: %s",
 151                                                 description));
 152                                         db.execSQL("insert or replace into description_history" +
 153                                                    "(description, description_upper, keep) " +
 154                                                    "values(?, ?, 1);",
 155                                                 new Object[]{description, description.toUpperCase()
 156                                                 });
 157                                     }
 158                                 }
 159                             }
 160
 161                             db.execSQL("delete from account_values where keep=0;");
 162                             db.execSQL("delete from accounts where keep=0;");
 163                             db.setTransactionSuccessful();
 164                         }
 165                         catch (OperationCanceledException e) {
 166                             Log.w("async", "Account retrieval cancelled");
 167                         }
 168                         finally {
 169                             db.endTransaction();
 170                         }
 171                     }
 172                 }
 173             }
 174         }
 175         catch (MalformedURLException e) {
 176             error = R.string.err_bad_backend_url;
 177             e.printStackTrace();
 178         }
 179         catch (FileNotFoundException e) {
 180             error = R.string.err_bad_auth;
 181             e.printStackTrace();
 182         }
 183         catch (IOException e) {
 184             error = R.string.err_net_io_error;
 185             e.printStackTrace();
 186         }
 187         catch (Exception e) {
 188             error = R.string.err_net_error;
 189             e.printStackTrace();
 190         }
 191
 192         return null;
 193     }
 194     private void throwIfCancelled() {
 195         if (isCancelled()) throw new OperationCanceledException(null);
 196     }
 197
 198     private void addAccount(SQLiteDatabase db, String name) {
 199         do {
 200             LedgerAccount acc = new LedgerAccount(name);
 201             db.execSQL("update accounts set level = ?, keep = 1 where name = ?",
 202                     new Object[]{acc.getLevel(), name});
 203             db.execSQL("insert into accounts(name, name_upper, parent_name, level) select ?,?," +
 204                        "?,? " + "where (select changes() = 0)",
 205                     new Object[]{name, name.toUpperCase(), acc.getParentName(), acc.getLevel()});
 206             name = acc.getParentName();
 207         } while (name != null);
 208     }
 209     @Override
 210     protected void onPostExecute(Void result) {
 211         AccountSummaryFragment ctx = mContext.get();
 212         if (ctx == null) return;
 213         ctx.onAccountRefreshDone(this.error);
 214     }
 215
 216 }