adds support for opengraph metadata

bibtexbrowser-documentation.wiki

@@ -10,15 +10,8 @@ This documentation is collaborative, you can improve it using a [[https://github
 
 +++TOC+++
 
-=====Major features=====
-* bibtexbrowser generates [[http://www.monperrus.net/martin/accurate+bibliographic+metadata+and+google+scholar|Google Scholar metadata]] so as to improve the visibility of your papers on Google Scholar. 
-* More and more academics use bibliographic software like [[http://www.zotero.org/|Zotero]] or [[http://www.mendeley.com/|Mendeley]]. bibtexbrowser generates [[http://ocoins.info/|COinS]] for automatic import of bibliographic entries with [[http://www.zotero.org/|Zotero]] and [[http://www.mendeley.com/|Mendeley]].
-* People can subscribe to the RSS publication feed of an individual or a group so as to being kept up-to-date: bibtexbrowser generates RSS feeds for all queries (simply add &rss at the end of the URL)! [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=monperrus.bib&all&rss|demo]]
-* bibtexbrowser can display all entries for an author with an academic style (i.e book, articles, conference, workshop): [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&academic=Ducasse|demo]]
-* bibtexbrowser can be used to embed a publication list into another page: [[http://www.monperrus.net/martin/publications|demo]]
-* bibtexbrowser is easy to install: just a single file.
-
-=====Other features=====
+=====Features=====
+* **(02/2016)** support for [[http://ogp.me/|OpenGraph metadata]]
 * **(10/2015)** support for filtering bibtex fields
 * **(10/2013)** support for localization (see below)
 * **(07/2012)** new label types (see config value ABBRV_TYPE)
@@ -28,13 +21,17 @@ This documentation is collaborative, you can improve it using a [[https://github
 * **(09/2010)** bibtexbrowser now supports multiple bibtex files (''bibtexbrowser.php?bib=file1.bib;file2.bib'')
 * **(05/2010)** bibtexbrowser adds links to your co-author pages if you define the corresponding @string (see function addHomepageLink)
 * **(01/2010)** bibtexbrowser can handle user-defined bibliographic styles
+* bibtexbrowser generates publication RSS feeds (simply add &rss at the end of the URL)! [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=monperrus.bib&all&rss|demo]]
 * **(10/2009)** bibtexbrowser is able to generate a bibtex file containing only the selected entries (simply add &astext at the end of the link)
 * **(10/2009)** bibtexbrowser is now independent of the configuration of register_globals
 * **(01/2009)** bibtexbrowser allows multi criteria search, e.g.  [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&type=inproceedings&year=2004|demo]]
+* bibtexbrowser generates [[http://ocoins.info/|COinS]] for automatic import of bibliographic entries with [[http://www.zotero.org/|Zotero]] and [[http://www.mendeley.com/|Mendeley]].
+* bibtexbrowser generates [[http://www.monperrus.net/martin/accurate+bibliographic+metadata+and+google+scholar|Google Scholar metadata]] so as to improve the visibility of your papers on Google Scholar. 
 * bibtexbrowser replaces constants defined in @STRING
 * bibtexbrowser is very fast because it keeps a compiled version of the bibtex file (PHP object serialized)
 * bibtexbrowser is compatible with PHP 4.x and PHP 5.x
 * bibtexbrowser can display the menu and all entries without filtering from the file name passed as parameter [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib|demo]]
+* bibtexbrowser can display all entries for an author with an academic style (i.e book, articles, conference, workshop): [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&academic=Ducasse|demo]]
 * bibtexbrowser can display all entries  out of a bibtex file [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&all|demo]]
 * bibtexbrowser can display all entries for a given year [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&year=2004|demo]]
 * bibtexbrowser can display a single bibtex entry [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&key=monperrus08d|demo]]
@@ -43,6 +40,7 @@ This documentation is collaborative, you can improve it using a [[https://github
 * bibtexbrowser outputs valid XHTML 1.0 Transitional
 * bibtexbrowser can display all entries for an author [[http://www.monperrus.net/martin/bibtexbrowser.php?bib=metrics.bib&author=Barbara+A.+Kitchenham|demo]]
 * bibtexbrowser can be used with different encodings (change the default iso-8859-1 encoding if your bib file is in UTF-8 ''define('BIBTEX_INPUT_ENCODING','UTF-8')'' )
+* bibtexbrowser is easy to install: just a single file.
 
 
 =====Download=====

bibtexbrowser-test.php

@@ -163,6 +163,25 @@ class BTBTest extends PHPUnit_Framework_TestCase {
     
   }
   
+    function test_metadata_opengraph() {
+    $test_data = fopen('php://memory','x+');
+    fwrite($test_data, "@article{aKey,title={A Book},author={Martin Monperrus},url={http://foo.com/},publisher={Springer},year=2009,pages={42--4242},number=1}\n".
+    "@String{x=2008}\n"
+    );
+    fseek($test_data,0);
+    $db = new BibDataBase();
+    $db->update_internal("inline", $test_data);
+    $dis = new BibEntryDisplay($db->getEntryByKey('aKey'));
+    $metadata = $dis->metadata_dict();
+    
+    //print_r($metadata);
+    $this->assertEquals("A Book",$metadata['og:title']);
+    $this->assertEquals("article",$metadata['og:type']);
+    $this->assertTrue(1 == preg_match("/http:.*author=Martin\+Monperrus/",$metadata['og:author']));
+    $this->assertEquals("2009",$metadata['og:published_time']);    
+  }
+
+  
   function test_math_cal() {
     $test_data = fopen('php://memory','x+');
     fwrite($test_data, "@book{aKey,title={{A Book{} $\mbox{foo}$ tt $\boo{t}$}} ,author={Martin Monperrus},publisher={Springer},year=2009}\n".

bibtexbrowser.php

@@ -200,6 +200,7 @@ if (defined('ENCODING')) {
 @define('MULTIPLE_BIB_SEPARATOR',';');
 @define('METADATA_GS',true);
 @define('METADATA_DC',true);
+@define('METADATA_OPENGRAPH',true);
 @define('METADATA_EPRINTS',false);
 
 // define sort order for special values in 'year' field
@@ -1257,6 +1258,13 @@ class BibEntry {
       return $lastname;
   }
 
+  /**
+    * Returns the first name of an author name.
+    */
+  function getFirstName($author){
+      list($firstname, $lastname) = splitFullName($author);
+      return $firstname;
+  }
 
   /** Has this entry the given field? */
   function hasField($name) {
@@ -3219,6 +3227,10 @@ class BibEntryDisplay {
       $result = $this->metadata_dublin_core($result);
     }
     
+    if (METADATA_OPENGRAPH) {
+      $result = $this->metadata_opengraph($result);
+    }
+    
     if (METADATA_EPRINTS) {
       $result = $this->metadata_eprints($result);
     }
@@ -3226,6 +3238,20 @@ class BibEntryDisplay {
     return $result;    
   } // end function metadata
   
+  function metadata_opengraph($result) {
+    // Facebook metadata
+    // see http://ogp.me
+    // https://developers.facebook.com/tools/debug/og/object/
+    $result[] = array('og:type','article');  
+    $result[] = array('og:title',$this->bib->getTitle());
+    foreach($this->bib->getRawAuthors() as $author) {
+    // opengraph requires a URL as author value
+    $result[] = array('og:author',"http://".@$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME'].'?bib='.urlencode($this->bib->filename).'&author='.urlencode($author));
+    }
+    $result[] = array('og:published_time',$this->bib->getYear());
+    return $result;
+  } // end function metadata_opengraph
+  
   function metadata_dublin_core($result) {
     // Dublin Core should not be used for bibliographic metadata
     // according to several sources
@@ -3874,7 +3900,7 @@ if (method_exists($content, 'metadata')) {
 }
 foreach($metatags as $item) {
   list($name,$value) = $item;
-  echo '<meta name="'.$name.'" content="'.$value.'"/>'."\n";
+  echo '<meta name="'.$name.'" property="'.$name.'" content="'.$value.'"/>'."\n";
 } // end foreach