source: gs2-extensions/afrepo/trunk/src/src/AFRepo.GSDLEXT.class.php.in@ 27339

<?php

/**
 * Bart Nagel <[email protected]>
 *
 * AFRepo top-level class to slot in with the Greenstone extension framework
 *
 * The audio is expected to be in subdirectories of the 'audio-files' directory, and 
 * for example purposes can be named in such a way that the example 
 * PathClassifier classifier can get meanining from it.
 */

class AFRepo extends AFRepoBase {
    private $allfiles;

    public function AFRepo() 
    {
      $this->audio_files_dir = "audio-files";
      $this->af_prefix = getcwd() . "/" . $this->audio_files_dir;
    }

    public function getName() {
        return "Salami 4Store audio repository";
    }

    public function getURIPrefix() {
        return "@afrepo-http-prefix@/afrepo/";
    }

    /* Done this way, can talk to the 4store server directly
           rather than relying on proxying through the PHP-based 'afrepo' server */
    public function getTrippleStoreURIPrefix() {
        return "@afrepo-http-prefix@/4store/";
    }

    public function getSparqlEndpoint() {
        return $this->getTrippleStoreURIPrefix() . "sparql/";
    }

    public function getDataEndpoint() {
        return $this->getTrippleStoreURIPrefix() . "data/";
    }

    /**
     * getAudioPath
     * Return the path to the audio links in this repository (without a trailing 
     * slash)
     */
    public function getAudioPath() {
        return realpath("audio-ids");
    }


    protected function remove_audio_files_prefix($full_filepath) {
#     echo "full filepath = " . $full_filepath . "\n";
#     echo "af prefix = " . $this->af_prefix . "\n";

      $af_prefix_len = strlen($this->af_prefix);
      $filepath = $full_filepath; 

      if (substr($filepath, 0, $af_prefix_len) == $this->af_prefix) {
        $filepath = substr($filepath, $af_prefix_len);
      } 

#     echo "** filepath = " . $filepath . "\n";

      return $filepath;
    }


    /**
     * fileInRepo
     * Return true if the audiofile with the given path (canonical or symlink) 
     * is in the repository or false if not
     */
    public function fileInRepo($full_filepath) {
      $realpath = realpath($full_filepath);
      if ($realpath === false) {
        trigger_error("file '$filepath' does not exist on disk or is a broken symlink", E_USER_WARNING);
        return false;
      }

      return array_key_exists($full_filepath, $this->getAllFiles());
    }


    /**
     * idToCanonicalPath
     * Return the path to the canonical file with the given ID
     */
    public function idToCanonicalPath($id) {
        return readlink($this->idToLinkPath($id));
    }


    /**
     * filePathToId
     * Return the ID of the audiofile with the given path (which can be 
     * canonical or a symlink)
     */
    public function filePathToId($full_filepath) {
      if (!$this->fileInRepo($full_filepath)) {
        throw new Exception("file with path '$filepath' is not in the repository");
      }

      $hash_filepath = "salami:/" . $this->remove_audio_files_prefix($full_filepath);

##    echo "Hashing on: " . $hash_filepath . "\n";

      $id = md5($hash_filepath);
      return $id;
    }



    // recursive method to delete things from the links directory according to the 
    // options
    function getAllCollectionFilesRec($collection, $path) {

      echo "Processing directory: " . $path . "\n";

      $dir = dir($path);

      while (($entry = $dir->read()) !== false) {

        if ($entry == "." || $entry == "..") {
          continue;
        }

        $fullpath = $path . "/" . $entry;

        $isdir = false;
        if (is_link($fullpath)) {

          $realpath = readlink($fullpath);

          // follow potential chain of sym-links
          while (is_link($realpath)) {
        $realpath = readlink($realpath);
          }

          $isdir = is_dir($realpath);
        }
        else {
          $isdir = is_dir($fullpath);
        }


        if ($isdir) {

          $this->getAllCollectionFilesRec($collection,$fullpath);
        } 
        else {
          // assume it is a file
##        echo "Adding file: " . $fullpath . "\n";
          $this->allfiles[$fullpath] = true;
        }
      }

      $dir->close();
      
    }
    
    
    public function getAllFiles() 
    {
      if (!is_null($this->allfiles)) {
        return $this->allfiles;
      }
      
      $this->allfiles = array();

##    $path = realpath($this->audio_files_dir);   
      $path = $this->af_prefix;
      $dir  = dir($path);
      
      while (($file = $dir->read()) !== false) {

        if ($file[0] == ".") {
          // skip all dot files and dirs
          continue;
        }

        $fullpath = $path . "/" . $file;

        $isdir = false;
        if (is_link($fullpath)) {

          $realpath = readlink($fullpath);

          // follow potential chain of sym-links
          while (is_link($realpath)) {
        $realpath = readlink($realpath);
          }

          $isdir = is_dir($realpath);
        }
        else {
          $isdir = is_dir($fullpath);
        }

        if ($isdir) {

          // recursively work through each collection directory
          $this->getAllCollectionFilesRec($file, $fullpath);
        }
      }

      $dir->close();
      
      return $this->allfiles;
    }


    public function getAllFilesOLD() {
        if (!is_null($this->allfiles))
            return $this->allfiles;

        $this->allfiles = array();
        $path = realpath("audio-files");
        $dir = dir($path);
        while (($file = $dir->read()) !== false) {
            if ($file[0] != "." && is_dir($path . "/" . $file)) {
                $subdir = dir($path . "/" . $file);
                while (($subfile = $subdir->read()) !== false) {
                    if ($subfile[0] != "." && is_file($path . "/" . $file . "/" . $subfile))
                        $this->allfiles[$path . "/" . $file . "/" . $subfile] = true;
                }
                $subdir->close();
            }
        }
        $dir->close();

        return $this->allfiles;
    }

    public function getSongFilesOLD($id) {
        $filepath = $this->idToLinkPath($id);
        $origfilepath = realpath($filepath);

        if ($origfilepath === false)
            return array();

        // is it a clip?
        if (preg_match('%\.clip\..{1,4}$%', $origfilepath)) {
            // does full version exist?
            $fullpath = preg_replace('%\.clip%', "", $origfilepath);
            if (file_exists($fullpath))
                return array($fullpath, $origfilepath);
            return array($origfilepath);
        }

        // it's a full song. does clip exist?
        $clippath = preg_replace('%(\..{1,4})$%', '.clip\1', $origfilepath);
        if (file_exists($clippath))
            return array($origfilepath, $clippath);
        return array($origfilepath);
    }

    public function haveMetadataPermission() {
        return true;
    }

    public function haveAudioPermission() {
        return ipInRange($_SERVER["REMOTE_ADDR"], "127.0.0.0/8");
    }

    public function getMBID($id) {
        $classifiers = array(
            new TagClassifier(),
            new EchonestClassifier(),
            new PathClassifier(),
        );

        foreach ($classifiers as $classifier) 
            if ($classifier->available() && $classifier->hasMBID($id))
                return $classifier->getMBID($id);
        return null;
    }
}

?>