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biblio_crossref.module in Bibliography Module 7.2

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modules/crossref/biblio_crossref.module
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<?php

/*
 * @file biblio_crossref.module
 *
 */
function biblio_crossref_form_biblio_node_form_alter(&$form, &$form_state) {
  global $user;
  if (phpversion() > 5 && !$form_state['submitted'] && !isset($form['#node']->nid)) {
    $form['biblio_doi_lookup'] = array(
      '#type' => 'fieldset',
      '#title' => t('DOI Lookup'),
      '#weight' => -20,
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
    );
    $have_pid = variable_get('biblio_crossref_pid', '');
    $user_pid = isset($user->data['biblio_crossref_pid']) && !empty($user->data['biblio_crossref_pid']) ? $user->data['biblio_crossref_pid'] : '';
    if (variable_get('biblio_show_crossref_profile_form', '1') && !empty($user_pid)) {
      $have_pid = $user_pid;
    }
    if (empty($have_pid)) {
      $form['biblio_doi_lookup']['doi_register'] = array(
        '#prefix' => '<p><b>',
        '#suffix' => '</b></p>',
        '#markup' => t('!url1 and then enter your CrossRef UserID in the "<i>CrossRef Login Information</i>" section of your account profile !url2', array(
          '!url1' => l('You need to register with CrossRef', 'http://www.crossref.org/requestaccount/', array(
            'attributes' => array(
              'target' => '_blank',
            ),
            'absolue' => TRUE,
          )),
          '!url2' => l('here...', "user/{$user->uid}/edit"),
        )),
      );
    }
    $form['biblio_doi_lookup']['doi_data'] = array(
      '#type' => 'textfield',
      '#title' => t('DOI'),
      '#required' => FALSE,
      '#default_value' => isset($form_state['values']['doi_data']) ? $form_state['values']['doi_data'] : '',
      '#description' => t('Enter a DOI name in the form: <b>10.1000/123456</b>'),
      '#disabled' => empty($have_pid),
      '#size' => 60,
      '#maxlength' => 255,
      '#weight' => -4,
    );
    $form['biblio_doi_lookup']['doi_submit'] = array(
      '#type' => 'submit',
      '#disabled' => empty($have_pid),
      '#value' => t('Populate using DOI'),
      '#submit' => array(
        'biblio_crossref_form_biblio_node_form_submit',
      ),
    );
  }
  $biblio_crossref_id = isset($form_state['values']['biblio_crossref_id']) ? $form_state['values']['biblio_crossref_id'] : '';
  $biblio_crossref_md5 = isset($form_state['values']['biblio_crossref_md5']) ? $form_state['values']['biblio_crossref_md5'] : '';
  $form['biblio_crossref_id'] = array(
    '#type' => 'value',
    '#value' => $biblio_crossref_id,
  );
  $form['biblio_crossref_md5'] = array(
    '#type' => 'value',
    '#value' => $biblio_crossref_md5,
  );
}
function biblio_crossref_form_biblio_node_form_submit($form, &$form_state) {
  global $user;
  $node_data = array();
  if (strlen($doi = $form_state['values']['doi_data'])) {
    if (($doi_start = strpos($form_state['values']['doi_data'], '10.')) !== FALSE) {
      if (!($dup = biblio_crossref_check_doi($doi))) {
        $crossref_pid = variable_get('biblio_crossref_pid', '');
        $user_pid = isset($user->data['biblio_crossref_pid']) && !empty($user->data['biblio_crossref_pid']) ? $user->data['biblio_crossref_pid'] : '';
        if (variable_get('biblio_show_crossref_profile_form', '1') && !empty($user_pid)) {
          $crossref_pid = $user_pid;
        }
        if (empty($crossref_pid)) {
          form_set_error('doi_data', t(l('You need to register with CrossRef', 'http://www.crossref.org/requestaccount/', array(
            'attributes' => array(
              'target' => '_blank',
            ),
            'absolue' => TRUE,
          )) . t(' and then enter your CrossRef UserID in the "<i>CrossRef Login Information</i>" section of your account profile !url', array(
            '!url' => l('here...', "user/{$user->uid}/edit"),
          ))));
          return;
        }
        module_load_include('php', 'biblio_crossref', 'biblio.crossref.client');
        $client = new BiblioCrossRefClient($doi, $crossref_pid);
        $node_data = $client
          ->fetch();
        if (!empty($node_data)) {
          $form_state['values'] = array_merge($form_state['values'], $node_data);
          $form_state['input']['biblio_type'] = $form_state['biblio_type'] = $node_data['biblio_type'];
        }
        else {
          form_set_error('doi_data', '');
        }
      }
      else {
        $message = t('The DOI that you are trying to import already exists in the database, see !url', array(
          '!url' => l('node/' . $dup, 'node/' . $dup),
        ));
        form_set_error('doi_data', $message);
      }
    }
    else {
      form_set_error('doi_data', t('This does not appear to be a valid DOI name, it should start with "10."'));
    }
  }
  $form_state['rebuild'] = TRUE;
  return;
}
function biblio_crossref_check_doi($doi) {
  return db_query("SELECT nid FROM {biblio_crossref} WHERE biblio_crossref_id = :doi", array(
    ':doi' => $doi,
  ))
    ->fetchField();
}
function biblio_crossref_biblio_lookup_link_settings() {
  return array(
    'crossref' => t('DOI'),
  );
}
function biblio_crossref_biblio_mapper_options() {
  return array(
    'crossref' => array(
      'title' => t('CrossRef XML'),
      'export' => FALSE,
    ),
  );
}
function biblio_crossref_biblio_lookup_link($node) {
  $show_link = variable_get('biblio_lookup_links', array(
    'crossref' => TRUE,
  ));
  if (empty($show_link['crossref']) || !isset($node) || !isset($node->biblio_crossref_id) && empty($node->biblio_doi)) {
    return;
  }
  if ($node->type == 'biblio') {
    $doi = isset($node->biblio_crossref_id) ? $node->biblio_crossref_id : $node->biblio_doi;
    if (($doi_start = strpos($doi, '10.')) !== FALSE) {
      $doi = substr($doi, $doi_start);
    }
    $link = 'http://dx.doi.org/' . $doi;
    return array(
      'biblio_crossref' => array(
        'title' => t('DOI'),
        'href' => $link,
        'attributes' => array(
          'title' => t("Click to view the CrossRef listing for this node"),
        ),
      ),
    );
  }
  return;
}
function biblio_crossref_node_view($node, $view_mode, $langcode) {
  if ($node->type == 'biblio' && (isset($node->biblio_crossref_id) || !empty($node->biblio_doi))) {
    switch ($view_mode) {
      case 'full':
      case 'teaser':
        $node->content['links']['biblio_crossref'] = array(
          '#links' => biblio_crossref_biblio_lookup_link($node),
          '#attributes' => array(
            'class' => array(
              'links',
              'inline',
            ),
          ),
        );
    }
  }
}
function biblio_crossref_node_delete($node) {
  if ($node->type != 'biblio') {
    return;
  }
  db_delete('biblio_crossref')
    ->condition('nid', $node->nid)
    ->execute();
}
function biblio_crossref_node_insert($node) {
  if ($node->type != 'biblio') {
    return;
  }
  if (empty($node->biblio_crossref_id)) {
    return;
  }
  drupal_write_record('biblio_crossref', $node);
}
function biblio_crossref_node_load($nodes, $types) {
  $result = db_query('SELECT  nid, biblio_crossref_id  FROM {biblio_crossref} WHERE nid IN(:nids)', array(
    ':nids' => array_keys($nodes),
  ));
  foreach ($result as $record) {
    $nodes[$record->nid]->biblio_crossref_id = $record->biblio_crossref_id;
  }
}
function biblio_crossref_crossref_map_reset($type = NULL) {
  module_load_include('install', 'biblio_crossref', 'biblio_crossref');
  _reset_crossref_map($type);
}