modules/bookpost/bookpost.module

<?php
// $Id: bookpost.module,v 1.2 2008/10/07 19:42:35 rubinsztajn Exp $

/**
 * @file
 * Aaron Rubinstein
 * Module for collecting book information and covers from the Open Library.
 * This modules filters ISBN's or OpenLibrary IDs supplied by users inside two
 * curly braces {{}} and returns book information and 
 * covers if available from the Open Library.
 * Based on John Miedema's OpenBook plugin for Wordpress
 * @see http://wordpress.org/extend/plugins/openbook-book-data/
 * @see http://openlibrary.org
 */

//Implementation of hook_filter_tips
function bookpost_filter_tips($delta, $format, $long = FALSE) {
  switch($delta) {
    case 0:
      if ($long) {
        return t('Placing an 10 or 13-digit ISBN or Open Library ID between curly braces, {{0312305389}}, will return book information and cover from the Open Library');
      }
      else {
        return t('An ISBN or Open Library ID between curly braces {{}} will return book info and cover');
      }
      break;
  }
}
 
//Implementation of hook_filter
function bookpost_filter($op, $delta = 0, $format = -1, $text ='') {
  switch ($op) {
    case 'list':
      return array(0 => t('Book Post Filter'));

    case 'description':
      return t('Replaces ISBN or Open Library ID, e.g. {{0738531367}}, {{OL1880549M}}, with book information and cover');

    case 'no cache':
      return TRUE;

    case 'prepare':
      return $text;

    case 'process':
      preg_match_all('/{{(.*)}}/', $text, $match);
      $tag = $match[0];
      $book = array();
      $counter=0;
      for($i=0;$i<count($match[1]);$i++) {
        $book[$counter] = retrieve_bookdata($match[1][$i]);
        $counter++;
      }  
      $text = str_replace($tag, $book, $text);  
      return $text;

    case 'settings':
      $form['bookpost_filter'] = array(
        '#type' => 'fieldset',
        '#title' => t('Book Post Filter'),
        '#collapsible' => TRUE,
        '#collapsed' => FALSE,
      );
      $form['bookpost_filter']['worldcat'] = array(
        '#type' => 'checkbox',
        '#title' => t('Link to WorldCat'),
        '#default_value' => variable_get('worldcat', 0),
      );
      $form['bookpost_filter']['librarything'] = array(
        '#type' => 'checkbox',
        '#title' => t('Link to LibraryThing'),
        '#default_value' => variable_get('librarything', 0),
      );
      $form['bookpost_filter']['googlebooks'] = array(
        '#type' => 'checkbox',
        '#title' => t('Link to Google Book Search'),
        '#default_value' => variable_get('googlebooks', 0),
      );
      return $form;
  }
}
 
function retrieve_bookdata($id) {
  if(preg_match('/^OL/', $id)) {
    $bookkey = '/b/'.$id;
  } 
  else { 
    $isbn = $id;
  
    //clean ISBN of dashes and spaces
    $isbn = str_replace("-", "", $isbn);
    $isbn = str_replace(" ", "", $isbn);
    
    $path = drupal_get_path('module', 'bookpost');    
    //link to WorldCat, LibraryThing, and Google books if selected
    if(variable_get('worldcat', 0)) {
      $worldcat = '<a href="http://worldcat.org/isbn/' . $isbn . '">Find on WorldCat</a><p />';
    }
    if(variable_get('librarything', 0)) {
      $librarything = '<a href="http://librarything.com/isbn/' . $isbn . '">Find on LibraryThing</a><p />';
    }
    if(variable_get('googlebooks', 0)) {
      $googlebooks = '<a href="http://books.google.com/books?vid=ISBN' . $isbn . '">Find on Google Books</a><br />';
    }  
    //query OpenLibrary for OL ids that match the ISBN
    $url_bookkeys = "http://openlibrary.org/api/search?q={%22query%22:%22(isbn_10:(".$isbn.")%20OR%20isbn_13:(".$isbn."))%22}&text=true";
    $bookkeys = get_url_contents($url_bookkeys, $curltimeout);
    $obj = json_decode($bookkeys);
    $bookkeyresult = $obj->{'result'};

    //determine number of versions and choose first available 
    //version if none specified
    $bookversioncount = count($bookkeyresult);
    if($bookversion == "") $bookversion = 1;
    elseif ($bookversion > $bookversioncount) $bookversion = $bookversioncount;
    $bookversion = $bookversion -1;
    
    $bookkey = $bookkeyresult[$bookversion];
  }
    
  $bookpage = "http://openlibrary.org" . $bookkey; 
  $curltimeout = 10;
  $url = "http://openlibrary.org/api/get?key=".$bookkey."&text=true";  
  $bookdata = get_url_contents($url, $curltimeout);

  $obj = json_decode($bookdata);
  $bookdataresult = $obj->{'result'};

  //title
  $title = $bookdataresult->{'title'};
  $subtitle = $bookdataresult->{'subtitle'};
  $title=ucwords($title);

  //authors -- handle multiple
  $authors = $bookdataresult->{'authors'};
  if(is_array($authors)) {
    for($i=0;$i<count($authors);$i++) {
      $authorkey = $authors[$i]->{'key'};
      $url_author = "http://openlibrary.org/api/get?key=".$authorkey."&text=true";

      $authordata = get_url_contents($url_author, $curltimeout);
      $obj = json_decode($authordata);
      $authorresult = $obj->{'result'};
      $name = $authorresult->{'name'};
      if($i==0) $authorlist = $name;
      else $authorlist = $authorlist.",".$name;
    }
  }
  $authors = $authorlist;
  if ($authors=="") {
    $authors = $bookdataresult->{'by_statement'};
    if ($authors=="") {
      $authors=$bookdataresult->{'contributions'};
      if(is_array($authors)) $authors=implode(",", $authors);
    }
  }  
  
  $authors = ucwords($authors);

  //publishers
  $publishers = $bookdataresult->{'publishers'};
  if(is_array($publishers)) {
    for($i=0;$i<count($publishers);$i++) {
      $publisher = $publishers[$i];
      if($i==0) $publisherlist = $publisher;
      else $publisherlist = $publisherlist . ", " . $publisher;
    }
  }
  $publishers = ucwords($publisherlist);
  
  //coverimage
  $olnumber_begin = stripos($bookkey,"/b/") + 3;
  $olnumber = substr($bookkey, $olnumber_begin);
  
    
  //test if Open Library returns a 1 pixel x 1 pixel image (i.e. no cover is available for the title
  $path = drupal_get_path('module', 'bookpost');    
  $size = getimagesize("http://covers.openlibrary.org/b/olid/$olnumber-M.jpg");
  if($size[0] == 1) {
    $coverimage =  $path . '/images/openlibrarylogo-en.jpg';
  }  
  else {
    $coverimage = "http://covers.openlibrary.org/b/olid/" .$olnumber . "-M.jpg";
  }
  //pagination
  $pages = $bookdataresult->{'number_of_pages'};

  //publication date
  $date = $bookdataresult->{'publish_date'};

  //link to fulltext if available
  $link = $bookdataresult->{'ocaid'};
  if($link) {
    $fulltext = '<a href="http://openlibrary.org/details/' . $link . '"><img src="' . $path .'/images/readonline.jpg" border="0" /></a><br />';
  }  

  //build HTML
  $html_bookdata = "";
  
   //coverimage
  $html_coverimage = "<img src='" . $coverimage . "' alt='' border=0 style='float:left;padding-right:15px;padding-bottom:10px;' />";
  $html_coverimage = "<a href='" . $bookpage . "'>" . $html_coverimage . "</a>";

  //title
  $html_title = '<a href="' . $bookpage . '" ><i>' . $title . '</i></a>';

  //author
  $html_authors = $authors;

  //publishers
  $html_publishers = $publishers;

  //assemble text
  $html_text = "Title: <b>" . $html_title . "</b><br /> " . "Author(s): <b> ". $html_authors . "</b><br />" . "Publisher: " .$html_publishers . '<br />' . "Pages: " . $pages . '<br />' . "Date: " .$date . '<p />' .$fulltext . $worldcat . $librarything . $googlebooks;

  //div id for themeing
  $html_bookdata = '<div class="bookpost" style="width:500px;height:275px;">' . $html_coverimage . $html_text . '</div>';
    
  return $html_bookdata;
  
}

//this method replaces file_get_contents, which is sometimes disallowed on servers
function get_url_contents($url, $curltimeout) {

  // Establish a cURL handle.
  $ch = curl_init($url);

  // Set our options
  curl_setopt($ch, CURLOPT_HEADER, false); //false=do not include headers
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //true=return as string
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $curltimeout); //timeout for when OL is down
  curl_setopt($ch, CURLOPT_TIMEOUT, $curltimeout); //timeout for when OL is down

  // Execute the request
  $output = curl_exec($ch);

  // Close the cURL session.
  curl_close($ch);

  if ($output == "") throw new Exception("Open Library Data Unavailable");
  
  return $output;
}
1	<?php
2	// $Id: bookpost.module,v 1.2 2008/10/07 19:42:35 rubinsztajn Exp $
3
4	/**
5	* @file
6	* Aaron Rubinstein
7	* Module for collecting book information and covers from the Open Library.
8	* This modules filters ISBN's or OpenLibrary IDs supplied by users inside two
9	* curly braces {{}} and returns book information and
10	* covers if available from the Open Library.
11	* Based on John Miedema's OpenBook plugin for Wordpress
12	* @see http://wordpress.org/extend/plugins/openbook-book-data/
13	* @see http://openlibrary.org
14	*/
15
16	//Implementation of hook_filter_tips
17	function bookpost_filter_tips($delta, $format, $long = FALSE) {
18	switch($delta) {
19	case 0:
20	if ($long) {
21	return t('Placing an 10 or 13-digit ISBN or Open Library ID between curly braces, {{0312305389}}, will return book information and cover from the Open Library');
22	}
23	else {
24	return t('An ISBN or Open Library ID between curly braces {{}} will return book info and cover');
25	}
26	break;
27	}
28	}
29
30	//Implementation of hook_filter
31	function bookpost_filter($op, $delta = 0, $format = -1, $text ='') {
32	switch ($op) {
33	case 'list':
34	return array(0 => t('Book Post Filter'));
35
36	case 'description':
37	return t('Replaces ISBN or Open Library ID, e.g. {{0738531367}}, {{OL1880549M}}, with book information and cover');
38
39	case 'no cache':
40	return TRUE;
41
42	case 'prepare':
43	return $text;
44
45	case 'process':
46	preg_match_all('/{{(.*)}}/', $text, $match);
47	$tag = $match[0];
48	$book = array();
49	$counter=0;
50	for($i=0;$i<count($match[1]);$i++) {
51	$book[$counter] = retrieve_bookdata($match[1][$i]);
52	$counter++;
53	}
54	$text = str_replace($tag, $book, $text);
55	return $text;
56
57	case 'settings':
58	$form['bookpost_filter'] = array(
59	'#type' => 'fieldset',
60	'#title' => t('Book Post Filter'),
61	'#collapsible' => TRUE,
62	'#collapsed' => FALSE,
63	);
64	$form['bookpost_filter']['worldcat'] = array(
65	'#type' => 'checkbox',
66	'#title' => t('Link to WorldCat'),
67	'#default_value' => variable_get('worldcat', 0),
68	);
69	$form['bookpost_filter']['librarything'] = array(
70	'#type' => 'checkbox',
71	'#title' => t('Link to LibraryThing'),
72	'#default_value' => variable_get('librarything', 0),
73	);
74	$form['bookpost_filter']['googlebooks'] = array(
75	'#type' => 'checkbox',
76	'#title' => t('Link to Google Book Search'),
77	'#default_value' => variable_get('googlebooks', 0),
78	);
79	return $form;
80	}
81	}
82
83	function retrieve_bookdata($id) {
84	if(preg_match('/^OL/', $id)) {
85	$bookkey = '/b/'.$id;
86	}
87	else {
88	$isbn = $id;
89
90	//clean ISBN of dashes and spaces
91	$isbn = str_replace("-", "", $isbn);
92	$isbn = str_replace(" ", "", $isbn);
93
94	$path = drupal_get_path('module', 'bookpost');
95	//link to WorldCat, LibraryThing, and Google books if selected
96	if(variable_get('worldcat', 0)) {
97	$worldcat = '<a href="http://worldcat.org/isbn/' . $isbn . '">Find on WorldCat</a><p />';
98	}
99	if(variable_get('librarything', 0)) {
100	$librarything = '<a href="http://librarything.com/isbn/' . $isbn . '">Find on LibraryThing</a><p />';
101	}
102	if(variable_get('googlebooks', 0)) {
103	$googlebooks = '<a href="http://books.google.com/books?vid=ISBN' . $isbn . '">Find on Google Books</a><br />';
104	}
105	//query OpenLibrary for OL ids that match the ISBN
106	$url_bookkeys = "http://openlibrary.org/api/search?q={%22query%22:%22(isbn_10:(".$isbn.")%20OR%20isbn_13:(".$isbn."))%22}&text=true";
107	$bookkeys = get_url_contents($url_bookkeys, $curltimeout);
108	$obj = json_decode($bookkeys);
109	$bookkeyresult = $obj->{'result'};
110
111	//determine number of versions and choose first available
112	//version if none specified
113	$bookversioncount = count($bookkeyresult);
114	if($bookversion == "") $bookversion = 1;
115	elseif ($bookversion > $bookversioncount) $bookversion = $bookversioncount;
116	$bookversion = $bookversion -1;
117
118	$bookkey = $bookkeyresult[$bookversion];
119	}
120
121	$bookpage = "http://openlibrary.org" . $bookkey;
122	$curltimeout = 10;
123	$url = "http://openlibrary.org/api/get?key=".$bookkey."&text=true";
124	$bookdata = get_url_contents($url, $curltimeout);
125
126	$obj = json_decode($bookdata);
127	$bookdataresult = $obj->{'result'};
128
129	//title
130	$title = $bookdataresult->{'title'};
131	$subtitle = $bookdataresult->{'subtitle'};
132	$title=ucwords($title);
133
134	//authors -- handle multiple
135	$authors = $bookdataresult->{'authors'};
136	if(is_array($authors)) {
137	for($i=0;$i<count($authors);$i++) {
138	$authorkey = $authors[$i]->{'key'};
139	$url_author = "http://openlibrary.org/api/get?key=".$authorkey."&text=true";
140
141	$authordata = get_url_contents($url_author, $curltimeout);
142	$obj = json_decode($authordata);
143	$authorresult = $obj->{'result'};
144	$name = $authorresult->{'name'};
145	if($i==0) $authorlist = $name;
146	else $authorlist = $authorlist.",".$name;
147	}
148	}
149	$authors = $authorlist;
150	if ($authors=="") {
151	$authors = $bookdataresult->{'by_statement'};
152	if ($authors=="") {
153	$authors=$bookdataresult->{'contributions'};
154	if(is_array($authors)) $authors=implode(",", $authors);
155	}
156	}
157
158	$authors = ucwords($authors);
159
160	//publishers
161	$publishers = $bookdataresult->{'publishers'};
162	if(is_array($publishers)) {
163	for($i=0;$i<count($publishers);$i++) {
164	$publisher = $publishers[$i];
165	if($i==0) $publisherlist = $publisher;
166	else $publisherlist = $publisherlist . ", " . $publisher;
167	}
168	}
169	$publishers = ucwords($publisherlist);
170
171	//coverimage
172	$olnumber_begin = stripos($bookkey,"/b/") + 3;
173	$olnumber = substr($bookkey, $olnumber_begin);
174
175
176	//test if Open Library returns a 1 pixel x 1 pixel image (i.e. no cover is available for the title
177	$path = drupal_get_path('module', 'bookpost');
178	$size = getimagesize("http://covers.openlibrary.org/b/olid/$olnumber-M.jpg");
179	if($size[0] == 1) {
180	$coverimage = $path . '/images/openlibrarylogo-en.jpg';
181	}
182	else {
183	$coverimage = "http://covers.openlibrary.org/b/olid/" .$olnumber . "-M.jpg";
184	}
185	//pagination
186	$pages = $bookdataresult->{'number_of_pages'};
187
188	//publication date
189	$date = $bookdataresult->{'publish_date'};
190
191	//link to fulltext if available
192	$link = $bookdataresult->{'ocaid'};
193	if($link) {
194	$fulltext = '<a href="http://openlibrary.org/details/' . $link . '"><img src="' . $path .'/images/readonline.jpg" border="0" /></a><br />';
195	}
196
197	//build HTML
198	$html_bookdata = "";
199
200	//coverimage
201	$html_coverimage = "<img src='" . $coverimage . "' alt='' border=0 style='float:left;padding-right:15px;padding-bottom:10px;' />";
202	$html_coverimage = "<a href='" . $bookpage . "'>" . $html_coverimage . "</a>";
203
204	//title
205	$html_title = '<a href="' . $bookpage . '" ><i>' . $title . '</i></a>';
206
207	//author
208	$html_authors = $authors;
209
210	//publishers
211	$html_publishers = $publishers;
212
213	//assemble text
214	$html_text = "Title: <b>" . $html_title . "</b><br /> " . "Author(s): <b> ". $html_authors . "</b><br />" . "Publisher: " .$html_publishers . '<br />' . "Pages: " . $pages . '<br />' . "Date: " .$date . '<p />' .$fulltext . $worldcat . $librarything . $googlebooks;
215
216	//div id for themeing
217	$html_bookdata = '<div class="bookpost" style="width:500px;height:275px;">' . $html_coverimage . $html_text . '</div>';
218
219	return $html_bookdata;
220
221	}
222
223	//this method replaces file_get_contents, which is sometimes disallowed on servers
224	function get_url_contents($url, $curltimeout) {
225
226	// Establish a cURL handle.
227	$ch = curl_init($url);
228
229	// Set our options
230	curl_setopt($ch, CURLOPT_HEADER, false); //false=do not include headers
231	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //true=return as string
232	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $curltimeout); //timeout for when OL is down
233	curl_setopt($ch, CURLOPT_TIMEOUT, $curltimeout); //timeout for when OL is down
234
235	// Execute the request
236	$output = curl_exec($ch);
237
238	// Close the cURL session.
239	curl_close($ch);
240
241	if ($output == "") throw new Exception("Open Library Data Unavailable");
242
243	return $output;
244	}