Takes a known string from metadata, builds a url to hit an api which returns an xml response
function pressbooks_copyright_license()
{
$option = get_option('pressbooks_theme_options_global');
$book_meta = \PressBooks\Book::getBookInformation();
// if they don't want to see it, return
// at minimum we need book copyright information set
if (isset($option['copyright_license']) && false == $option['copyright_license'] || !isset($option['copyright_license']) || !isset($book_meta['pb_book_license'])) {
return '';
}
global $post;
$id = $post->ID;
$title = is_front_page() ? get_bloginfo('name') : $post->post_title;
$post_meta = get_post_meta($id);
$link = get_permalink($id);
$html = $license = $copyright_holder = '';
$transient = get_transient("license-inf-{$id}");
$updated = array($license, $copyright_holder, $title);
$changed = false;
$lang = $book_meta['pb_language'];
// Copyright holder, set in order of precedence
if (isset($post_meta['pb_section_author'])) {
// section author overrides book author, copyrightholder
$copyright_holder = $post_meta['pb_section_author'][0];
} elseif (isset($book_meta['pb_copyright_holder'])) {
// book copyright holder overrides book author
$copyright_holder = $book_meta['pb_copyright_holder'];
} elseif (isset($book_meta['pb_author'])) {
// book author is the fallback, default
$copyright_holder = $book_meta['pb_author'];
}
// Copyright license, set in order of precedence
if (isset($post_meta['pb_section_license'])) {
// section copyright overrides book
$license = $post_meta['pb_section_license'][0];
} elseif (isset($book_meta['pb_book_license'])) {
// book is the fallback, default
$license = $book_meta['pb_book_license'];
}
//delete_transient("license-inf-$id");
// check if the user has changed anything
if (is_array($transient)) {
foreach ($updated as $val) {
if (!array_key_exists($val, $transient)) {
$changed = true;
}
}
}
// if the cache has expired, or the user changed the license
if (false === $transient || true == $changed) {
// get xml response from API
$response = \PressBooks\Metadata::getLicenseXml($license, $copyright_holder, $link, $title, $lang);
try {
// convert to object
$result = simplexml_load_string($response);
// evaluate it for errors
if (!false === $result || !isset($result->html)) {
throw new \Exception('Creative Commons license API not returning expected results at Pressbooks\\Metadata::getLicenseXml');
} else {
// process the response, return html
$html = \PressBooks\Metadata::getWebLicenseHtml($result->html);
}
} catch (\Exception $e) {
error_log($e->getMessage());
}
// store it with the license as a key
$value = array($license => $html, $copyright_holder => '', $title => '');
// expires in 24 hours
set_transient("license-inf-{$id}", $value, 86400);
} else {
$html = $transient[$license];
}
return $html;
}
/**
* Will create an html blob of copyright information, returns empty string
* if user doesn't want it displayed
*
* @param array $metadata
* @param string $title
* @param int $id
* @param string $section_author
* @return string $html blob
* @throws \Exception
*/
protected function doCopyrightLicense($metadata, $title = '', $id = '', $section_author = '')
{
$option = get_option('pressbooks_theme_options_global');
$html = $license = $copyright_holder = '';
$lang = $metadata['pb_language'];
// if they don't want to see it, return
// at minimum we need book copyright information set
if (false == $option['copyright_license'] || !isset($metadata['pb_book_license'])) {
return '';
}
// if no post $id given, we default to book copyright
if (!empty($id)) {
$section_license = get_post_meta($id, 'pb_section_license', true);
$link = get_permalink($id);
} else {
$section_license = '';
$link = get_bloginfo('url');
$title = get_bloginfo('name');
}
// Copyright holder, set in order of precedence
if (!empty($section_author)) {
// section author higher priority than book author, copyrightholder
$copyright_holder = $section_author;
} elseif (isset($metadata['pb_copyright_holder'])) {
// book copyright holder higher priority than book author
$copyright_holder = $metadata['pb_copyright_holder'];
} elseif (isset($metadata['pb_author'])) {
// book author is the fallback, default
$copyright_holder = $metadata['pb_author'];
}
// Copyright license, set in order of precedence
if (!empty($section_license)) {
// section copyright higher priority than book
$license = $section_license;
} elseif (isset($metadata['pb_book_license'])) {
// book is the fallback, default
$license = $metadata['pb_book_license'];
}
// get xml response from API
$response = Metadata::getLicenseXml($license, $copyright_holder, $link, $title, $lang);
try {
// convert to object
$result = simplexml_load_string($response);
// evaluate it for errors
if (!false === $result || !isset($result->html)) {
throw new \Exception('Creative Commons license API not returning expected results at Pressbooks\\Metadata::getLicenseXml');
} else {
// process the response, return html
$html = Metadata::getWebLicenseHtml($result->html);
}
} catch (\Exception $e) {
$this->logError($e->getMessage());
}
return $html;
}