www/js/filerepo.js

   1 /*
   2  * This file is part of WolneLektury-Mobile, licensed under GNU Affero GPLv3 or later.
   3  * Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4  */
   5
   6 var FileRepo = new function() {
   7         /* API for files repository */
   8         var self = this;
   9         this.root = null;
  10
  11         this.init = function(success, error) {
  12                 self.initRoot(success);
  13         };
  14
  15         this.initRoot = function(success) {
  16                 // fs size is irrelevant, PERSISTENT is futile (on Android, at least)
  17                 window.requestFileSystem(LocalFileSystem.TEMPORARY, 0, function(fs) {
  18                         debug('local fs found: ' + fs.root.fullPath);
  19                         self.root = fs.root;
  20
  21                         success && success();
  22                 }, function() {
  23                         debug('local fs not found');
  24                         success && success();
  25                 });
  26         };
  27
  28
  29         this.withLocalHtml = function(book_id, success, error) {
  30                 debug('info:withLocalHtml: id:' + book_id);
  31                 View.spinner('Otwieranie treści utworu');
  32                 if (!self.root)
  33                         error && error('info:withLocalHtml: no local html: no usable filesystem');
  34
  35                 var url = "file://" + self.root.fullPath + "/html/" + book_id;
  36                 debug('info:withLocalHtml: local ajax: ' + url);
  37                 var xhr = new XMLHttpRequest();
  38                 xhr.open('GET', url, true);
  39                 xhr.onload = function() {
  40                         debug('info:withLocalHtml: fetched by local ajax: ' + url);
  41                         success && success(xhr.responseText);
  42                 }
  43                 xhr.onerror = error;
  44                 xhr.send();
  45         };
  46
  47
  48         this.withLocal = function(win, fail) {
  49                 if (self.root) {
  50                         self.root.getDirectory('html', {create:true}, function(dir) {
  51                                 var reader = dir.createReader();
  52                                 reader.readEntries(win, fail);
  53                         });
  54                 }
  55                 else {
  56                         win && win([]);
  57                 }
  58         }
  59
  60
  61         // downloads HTML file from server, saves it in cache and calls success with file contents
  62         this.withHtmlFromServer = function(book_id, success, error) {
  63                 debug('info:withHtmlFromServer: id:' + book_id);
  64                 // read file from WL
  65                 Catalogue.withBook(book_id, function(book) {
  66                         var url = WL + book.html_file;
  67                         debug('info:withHtmlFromServer: fetching url: ' + url);
  68
  69                         View.spinner("Pobieranie treści utworu z sieci");
  70
  71                         var xhr = new XMLHttpRequest();
  72                         xhr.open("GET", url);
  73                         xhr.onload = function() {
  74                                 data = xhr.responseText;
  75                                 if(xhr.status != 200) {
  76                                                    alert(xhr.status);
  77                                         error && error('Błąd podczas pobierania pliku');
  78                                 } else {
  79                                   if (self.root) {
  80                                         self.root.getDirectory('html', {create: true}, function(dir) {
  81                                                         var reader = dir.getFile(''+book_id, {create: true}, function(f) {
  82                                                                                                          f.createWriter(function(w) {
  83                                                                                                                                         w.write(data);
  84                                                                                                                                         self.db.transaction(function(tx) {
  85                                                                                                                                                                                 alert('setlocal0');
  86                                                                                                                                                                                 tx.executeSql("UPDATE book SET _local=1 WHERE id="+book_id);
  87                                                                                                                                                                                 alert('setlocal1');
  88                                                                                                                                                                                 });
  89                                                                                                                                         });
  90                                                                                                          });
  91                                                                                    });
  92                                   }
  93                                   success && success(data);
  94                                 }
  95                         };
  96                         xhr.onerror = function(e) {
  97                                 debug('Błąd podczas pobierania pliku')
  98                                 error && error("error: " + data);
  99                         };
 100                         xhr.send();
 101                 });
 102         };
 103
 104         // calls the callback with contents of the HTML file for a given book,
 105         // loaded from the server and cached locally
 106         this.withHtml = function(id, success, error) {
 107                 debug('info:withHtml: id:' + id);
 108                 self.withLocalHtml(id, success, function() {
 109                         self.withHtmlFromServer(id, success, error);
 110                 });
 111         };
 112
 113
 114         this.clear = function() {
 115                 FileRepo.withLocal(function(local) {
 116                         for (i in local) {
 117                                 local[i].remove();
 118                         }
 119                 });
 120         };
 121
 122
 123         this.deleteIfExists = function(id) {
 124                 if (self.root) {
 125                         self.root.getFile('html/' + id, {create: false}, function(f) {
 126                                 f.remove();
 127                         });
 128                 }
 129         }
 130 };