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<?php
/**
* Utilities to import and export bookmarks using the Netscape format
*/
class NetscapeBookmarkUtils
{
/**
* Filters links and adds Netscape-formatted fields
*
* Added fields:
* - timestamp link addition date, using the Unix epoch format
* - taglist comma-separated tag list
*
* @param LinkDB $linkDb Link datastore
* @param string $selection Which links to export: (all|private|public)
* @param bool $prependNoteUrl Prepend note permalinks with the server's URL
* @param string $indexUrl Absolute URL of the Shaarli index page
*
* @throws Exception Invalid export selection
*
* @return array The links to be exported, with additional fields
*/
public static function filterAndFormat($linkDb, $selection, $prependNoteUrl, $indexUrl)
{
// see tpl/export.html for possible values
if (! in_array($selection, array('all', 'public', 'private'))) {
throw new Exception('Invalid export selection: "'.$selection.'"');
}
$bookmarkLinks = array();
foreach ($linkDb as $link) {
if ($link['private'] != 0 && $selection == 'public') {
continue;
}
if ($link['private'] == 0 && $selection == 'private') {
continue;
}
$date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
$link['timestamp'] = $date->getTimestamp();
$link['taglist'] = str_replace(' ', ',', $link['tags']);
if (startsWith($link['url'], '?') && $prependNoteUrl) {
$link['url'] = $indexUrl . $link['url'];
}
$bookmarkLinks[] = $link;
}
return $bookmarkLinks;
}
/**
* Generates an import status summary
*
* @param string $filename name of the file to import
* @param int $filesize size of the file to import
* @param int $importCount how many links were imported
* @param int $overwriteCount how many links were overwritten
* @param int $skipCount how many links were skipped
*
* @return string Summary of the bookmark import status
*/
private static function importStatus(
$filename,
$filesize,
$importCount=0,
$overwriteCount=0,
$skipCount=0
)
{
$status = 'File '.$filename.' ('.$filesize.' bytes) ';
if ($importCount == 0 && $overwriteCount == 0 && $skipCount == 0) {
$status .= 'has an unknown file format. Nothing was imported.';
} else {
$status .= 'was successfully processed: '.$importCount.' links imported, ';
$status .= $overwriteCount.' links overwritten, ';
$status .= $skipCount.' links skipped.';
}
return $status;
}
/**
* Imports Web bookmarks from an uploaded Netscape bookmark dump
*
* @param array $post Server $_POST parameters
* @param array $file Server $_FILES parameters
* @param LinkDB $linkDb Loaded LinkDB instance
* @param string $pagecache Page cache
*
* @return string Summary of the bookmark import status
*/
public static function import($post, $files, $linkDb, $pagecache)
{
$filename = $files['filetoupload']['name'];
$filesize = $files['filetoupload']['size'];
$data = file_get_contents($files['filetoupload']['tmp_name']);
// Sniff file type
if (! startsWith($data, '<!DOCTYPE NETSCAPE-Bookmark-file-1>')) {
return self::importStatus($filename, $filesize);
}
// Overwrite existing links?
$overwrite = ! empty($post['overwrite']);
// Add tags to all imported links?
if (empty($post['default_tags'])) {
$defaultTags = array();
} else {
$defaultTags = preg_split(
'/[\s,]+/',
escape($post['default_tags'])
);
}
// links are imported as public by default
$defaultPrivacy = 0;
$parser = new NetscapeBookmarkParser(
true, // nested tag support
$defaultTags, // additional user-specified tags
strval(1 - $defaultPrivacy) // defaultPub = 1 - defaultPrivacy
);
$bookmarks = $parser->parseString($data);
$importCount = 0;
$overwriteCount = 0;
$skipCount = 0;
foreach ($bookmarks as $bkm) {
$private = $defaultPrivacy;
if (empty($post['privacy']) || $post['privacy'] == 'default') {
// use value from the imported file
$private = $bkm['pub'] == '1' ? 0 : 1;
} else if ($post['privacy'] == 'private') {
// all imported links are private
$private = 1;
} else if ($post['privacy'] == 'public') {
// all imported links are public
$private = 0;
}
$newLink = array(
'title' => $bkm['title'],
'url' => $bkm['uri'],
'description' => $bkm['note'],
'private' => $private,
'linkdate'=> '',
'tags' => $bkm['tags']
);
$existingLink = $linkDb->getLinkFromUrl($bkm['uri']);
if ($existingLink !== false) {
if ($overwrite === false) {
// Do not overwrite an existing link
$skipCount++;
continue;
}
// Overwrite an existing link, keep its date
$newLink['linkdate'] = $existingLink['linkdate'];
$linkDb[$existingLink['linkdate']] = $newLink;
$importCount++;
$overwriteCount++;
continue;
}
// Add a new link
$newLinkDate = new DateTime('@'.strval($bkm['time']));
while (!empty($linkDb[$newLinkDate->format(LinkDB::LINK_DATE_FORMAT)])) {
// Ensure the date/time is not already used
// - this hack is necessary as the date/time acts as a primary key
// - apply 1 second increments until an unused index is found
// See https://github.com/shaarli/Shaarli/issues/351
$newLinkDate->add(new DateInterval('PT1S'));
}
$linkDbDate = $newLinkDate->format(LinkDB::LINK_DATE_FORMAT);
$newLink['linkdate'] = $linkDbDate;
$linkDb[$linkDbDate] = $newLink;
$importCount++;
}
$linkDb->savedb($pagecache);
return self::importStatus(
$filename,
$filesize,
$importCount,
$overwriteCount,
$skipCount
);
}
}
|
