Add custom filter of tags in the OPDS feed using facets.

Need more testing but should be ok.

re #21

OPDS_renderer.php

@@ -130,6 +130,13 @@ class OPDSRenderer
                 $link = new Link ($config['cops_full_url'] . 'feed.php?query={searchTerms}', "application/atom+xml", "search", "Search here");
             }
             self::renderLink ($link);
+            if ($page->containsBook () && !is_null ($config['cops_books_filter']) && count ($config['cops_books_filter']) > 0) {
+                $Urlfilter = getURLParam ("tag", "");
+                foreach ($config['cops_books_filter'] as $lib => $filter) {
+                    $link = new LinkFacet ("?" . $_SERVER['QUERY_STRING'] . "&tag=" . $filter, $lib, localize ("tagword.title"), $filter == $Urlfilter);
+                    self::renderLink ($link);
+                }
+            }
     }
         
     private function endXmlDocument () {
@@ -148,6 +155,12 @@ class OPDSRenderer
             if (!is_null ($link->title)) {
                 self::getXmlStream ()->writeAttribute ("title", $link->title);
             }
+            if (!is_null ($link->facetGroup)) {
+                self::getXmlStream ()->writeAttribute ("opds:facetGroup", $link->facetGroup);
+            }
+            if ($link->activeFacet) {
+                self::getXmlStream ()->writeAttribute ("opds:activeFacet", "true");
+            }
         self::getXmlStream ()->endElement ();
     }
 

author.php

@@ -68,7 +68,7 @@ order by substr (upper (sort), 1, 1)');
     }
     
     public static function getEntryArray ($query, $params) {
-        list ($totalNumber, $result) = parent::executeQuery ($query, self::AUTHOR_COLUMNS, $params, -1);
+        list ($totalNumber, $result) = parent::executeQuery ($query, self::AUTHOR_COLUMNS, "", $params, -1);
         $entryArray = array();
         while ($post = $result->fetchObject ())
         {

base.php

@@ -93,12 +93,16 @@ class Link
     public $type;
     public $rel;
     public $title;
+    public $facetGroup;
+    public $activeFacet;
     
-    public function __construct($phref, $ptype, $prel = NULL, $ptitle = NULL) {
+    public function __construct($phref, $ptype, $prel = NULL, $ptitle = NULL, $pfacetGroup = NULL, $pactiveFacet = FALSE) {
         $this->href = $phref;
         $this->type = $ptype;
         $this->rel = $prel;
         $this->title = $ptitle;
+        $this->facetGroup = $pfacetGroup;
+        $this->activeFacet = $pactiveFacet;
     }
     
     public function hrefXhtml () {
@@ -114,6 +118,13 @@ class LinkNavigation extends Link
     }
 }
 
+class LinkFacet extends Link
+{
+    public function __construct($phref, $ptitle = NULL, $pfacetGroup = NULL, $pactiveFacet = FALSE) {
+        parent::__construct ($phref, Link::OPDS_PAGING_TYPE, "http://opds-spec.org/facet", $ptitle, $pfacetGroup, $pactiveFacet);
+        $this->href = $_SERVER["SCRIPT_NAME"] . $this->href;
+    }
+}
 
 class Entry
 {
@@ -294,6 +305,13 @@ class Page
         return ceil ($this->totalNumber / $config['cops_max_item_per_page']);
     }
     
+    public function containsBook ()
+    {
+        if (count ($this->entryArray) == 0) return false;
+        if (get_class ($this->entryArray [1]) == "EntryBook") return true;
+        return false;
+    }
+
 }
 
 class PageAllAuthors extends Page
@@ -470,14 +488,14 @@ abstract class Base
         return self::$db;
     }
     
-    public static function executeQuery($query, $columns, $params, $n) {
+    public static function executeQuery($query, $columns, $filter, $params, $n) {
         global $config;
         $totalResult = -1;
         
         if ($config['cops_max_item_per_page'] != -1 && $n != -1)
         {
             // First check total number of results
-            $result = self::getDb ()->prepare (str_format ($query, "count(*)"));
+            $result = self::getDb ()->prepare (str_format ($query, "count(*)", $filter));
             $result->execute ($params);
             $totalResult = $result->fetchColumn ();
             
@@ -486,7 +504,7 @@ abstract class Base
             array_push ($params, ($n - 1) * $config['cops_max_item_per_page'], $config['cops_max_item_per_page']);
         }
         
-        $result = self::getDb ()->prepare(str_format ($query, $columns));
+        $result = self::getDb ()->prepare(str_format ($query, $columns, $filter));
         $result->execute ($params);
         return array ($totalResult, $result);
     }

book.php

@@ -20,15 +20,15 @@ define ('SQL_BOOKS_LEFT_JOIN', "left outer join comments on comments.book = book
 define ('SQL_BOOKS_BY_FIRST_LETTER', "select {0} from books " . SQL_BOOKS_LEFT_JOIN . "
                                                     where upper (books.sort) like ?");
 define ('SQL_BOOKS_BY_AUTHOR', "select {0} from books_authors_link, books " . SQL_BOOKS_LEFT_JOIN . "
-                                                    where books_authors_link.book = books.id and author = ? order by pubdate");
+                                                    where books_authors_link.book = books.id and author = ? {1} order by pubdate");
 define ('SQL_BOOKS_BY_SERIE', "select {0} from books_series_link, books " . SQL_BOOKS_LEFT_JOIN . "
-                                                    where books_series_link.book = books.id and series = ? order by series_index");
+                                                    where books_series_link.book = books.id and series = ? {1} order by series_index");
 define ('SQL_BOOKS_BY_TAG', "select {0} from books_tags_link, books " . SQL_BOOKS_LEFT_JOIN . "
-                                                    where books_tags_link.book = books.id and tag = ? order by sort");
+                                                    where books_tags_link.book = books.id and tag = ? {1} order by sort");
 define ('SQL_BOOKS_QUERY', "select {0} from books " . SQL_BOOKS_LEFT_JOIN . "
-                                                    where exists (select null from authors, books_authors_link where book = books.id and author = authors.id and authors.name like ?) or title like ?");
+                                                    where (exists (select null from authors, books_authors_link where book = books.id and author = authors.id and authors.name like ?) or title like ?) {1}");
 define ('SQL_BOOKS_RECENT', "select {0} from books " . SQL_BOOKS_LEFT_JOIN . "
-                                                    order by timestamp desc limit ");
+                                                    where 1=1 {1} order by timestamp desc limit ");
 
 class Book extends Base {
     const ALL_BOOKS_UUID = "urn:uuid";
@@ -113,6 +113,25 @@ class Book extends Base {
         return $this->authors;
     }
     
+    public function getFilterString () {
+        $filter = getURLParam ("tag", NULL);
+        if (is_null ($filter)) return "";
+        
+        $exists = true;
+        if (preg_match ("/^!(.*)$/", $filter, $matches)) {
+            $exists = false;
+            $filter = $matches[1];    
+        }
+        
+        $result = "exists (select null from books_tags_link, tags where books_tags_link.book = books.id and books_tags_link.tag = tags.id and tags.name = '" . $filter . "')";
+        
+        if (!$exists) {
+            $result = "not " . $result;
+        }
+    
+        return "and " . $result;
+    }
+    
     public function getAuthorsName () {
         $authorList = null;
         foreach ($this->getAuthors () as $author) {
@@ -432,7 +451,7 @@ order by substr (upper (sort), 1, 1)");
     }
     
     public static function getEntryArray ($query, $params, $n) {
-        list ($totalNumber, $result) = parent::executeQuery ($query, self::BOOK_COLUMNS, $params, $n);
+        list ($totalNumber, $result) = parent::executeQuery ($query, self::BOOK_COLUMNS, self::getFilterString (), $params, $n);
         $entryArray = array();
         while ($post = $result->fetchObject ())
         {

config_default.php

@@ -134,4 +134,9 @@
      * 0 : No
      */
     $config['cops_update_epub-metadata'] = "0";
+    
+    /*
+     * Filter on tags to book list
+     */
+    $config['cops_books_filter'] = array ("Non lus" => "!Read", "lus" => "Read");  
 ?>