386 lines
12 KiB
PHP
386 lines
12 KiB
PHP
<?php
|
|
/**
|
|
* Data storage for links.
|
|
*
|
|
* This object behaves like an associative array.
|
|
*
|
|
* Example:
|
|
* $myLinks = new LinkDB();
|
|
* echo $myLinks['20110826_161819']['title'];
|
|
* foreach ($myLinks as $link)
|
|
* echo $link['title'].' at url '.$link['url'].'; description:'.$link['description'];
|
|
*
|
|
* Available keys:
|
|
* - description: description of the entry
|
|
* - linkdate: date of the creation of this entry, in the form YYYYMMDD_HHMMSS
|
|
* (e.g.'20110914_192317')
|
|
* - private: Is this link private? 0=no, other value=yes
|
|
* - tags: tags attached to this entry (separated by spaces)
|
|
* - title Title of the link
|
|
* - url URL of the link. Used for displayable links (no redirector, relative, etc.).
|
|
* Can be absolute or relative.
|
|
* Relative URLs are permalinks (e.g.'?m-ukcw')
|
|
* - real_url Absolute processed URL.
|
|
*
|
|
* Implements 3 interfaces:
|
|
* - ArrayAccess: behaves like an associative array;
|
|
* - Countable: there is a count() method;
|
|
* - Iterator: usable in foreach () loops.
|
|
*/
|
|
class LinkDB implements Iterator, Countable, ArrayAccess
|
|
{
|
|
// Links are stored as a PHP serialized string
|
|
private $_datastore;
|
|
|
|
// Datastore PHP prefix
|
|
protected static $phpPrefix = '<?php /* ';
|
|
|
|
// Datastore PHP suffix
|
|
protected static $phpSuffix = ' */ ?>';
|
|
|
|
// List of links (associative array)
|
|
// - key: link date (e.g. "20110823_124546"),
|
|
// - value: associative array (keys: title, description...)
|
|
private $_links;
|
|
|
|
// List of all recorded URLs (key=url, value=linkdate)
|
|
// for fast reserve search (url-->linkdate)
|
|
private $_urls;
|
|
|
|
// List of linkdate keys (for the Iterator interface implementation)
|
|
private $_keys;
|
|
|
|
// Position in the $this->_keys array (for the Iterator interface)
|
|
private $_position;
|
|
|
|
// Is the user logged in? (used to filter private links)
|
|
private $_loggedIn;
|
|
|
|
// Hide public links
|
|
private $_hidePublicLinks;
|
|
|
|
// link redirector set in user settings.
|
|
private $_redirector;
|
|
|
|
/**
|
|
* Creates a new LinkDB
|
|
*
|
|
* Checks if the datastore exists; else, attempts to create a dummy one.
|
|
*
|
|
* @param string $datastore datastore file path.
|
|
* @param boolean $isLoggedIn is the user logged in?
|
|
* @param boolean $hidePublicLinks if true all links are private.
|
|
* @param string $redirector link redirector set in user settings.
|
|
*/
|
|
function __construct($datastore, $isLoggedIn, $hidePublicLinks, $redirector = '')
|
|
{
|
|
$this->_datastore = $datastore;
|
|
$this->_loggedIn = $isLoggedIn;
|
|
$this->_hidePublicLinks = $hidePublicLinks;
|
|
$this->_redirector = $redirector;
|
|
$this->_checkDB();
|
|
$this->_readDB();
|
|
}
|
|
|
|
/**
|
|
* Countable - Counts elements of an object
|
|
*/
|
|
public function count()
|
|
{
|
|
return count($this->_links);
|
|
}
|
|
|
|
/**
|
|
* ArrayAccess - Assigns a value to the specified offset
|
|
*/
|
|
public function offsetSet($offset, $value)
|
|
{
|
|
// TODO: use exceptions instead of "die"
|
|
if (!$this->_loggedIn) {
|
|
die('You are not authorized to add a link.');
|
|
}
|
|
if (empty($value['linkdate']) || empty($value['url'])) {
|
|
die('Internal Error: A link should always have a linkdate and URL.');
|
|
}
|
|
if (empty($offset)) {
|
|
die('You must specify a key.');
|
|
}
|
|
$this->_links[$offset] = $value;
|
|
$this->_urls[$value['url']]=$offset;
|
|
}
|
|
|
|
/**
|
|
* ArrayAccess - Whether or not an offset exists
|
|
*/
|
|
public function offsetExists($offset)
|
|
{
|
|
return array_key_exists($offset, $this->_links);
|
|
}
|
|
|
|
/**
|
|
* ArrayAccess - Unsets an offset
|
|
*/
|
|
public function offsetUnset($offset)
|
|
{
|
|
if (!$this->_loggedIn) {
|
|
// TODO: raise an exception
|
|
die('You are not authorized to delete a link.');
|
|
}
|
|
$url = $this->_links[$offset]['url'];
|
|
unset($this->_urls[$url]);
|
|
unset($this->_links[$offset]);
|
|
}
|
|
|
|
/**
|
|
* ArrayAccess - Returns the value at specified offset
|
|
*/
|
|
public function offsetGet($offset)
|
|
{
|
|
return isset($this->_links[$offset]) ? $this->_links[$offset] : null;
|
|
}
|
|
|
|
/**
|
|
* Iterator - Returns the current element
|
|
*/
|
|
function current()
|
|
{
|
|
return $this->_links[$this->_keys[$this->_position]];
|
|
}
|
|
|
|
/**
|
|
* Iterator - Returns the key of the current element
|
|
*/
|
|
function key()
|
|
{
|
|
return $this->_keys[$this->_position];
|
|
}
|
|
|
|
/**
|
|
* Iterator - Moves forward to next element
|
|
*/
|
|
function next()
|
|
{
|
|
++$this->_position;
|
|
}
|
|
|
|
/**
|
|
* Iterator - Rewinds the Iterator to the first element
|
|
*
|
|
* Entries are sorted by date (latest first)
|
|
*/
|
|
function rewind()
|
|
{
|
|
$this->_keys = array_keys($this->_links);
|
|
rsort($this->_keys);
|
|
$this->_position = 0;
|
|
}
|
|
|
|
/**
|
|
* Iterator - Checks if current position is valid
|
|
*/
|
|
function valid()
|
|
{
|
|
return isset($this->_keys[$this->_position]);
|
|
}
|
|
|
|
/**
|
|
* Checks if the DB directory and file exist
|
|
*
|
|
* If no DB file is found, creates a dummy DB.
|
|
*/
|
|
private function _checkDB()
|
|
{
|
|
if (file_exists($this->_datastore)) {
|
|
return;
|
|
}
|
|
|
|
// Create a dummy database for example
|
|
$this->_links = array();
|
|
$link = array(
|
|
'title'=>' Shaarli: the personal, minimalist, super-fast, no-database delicious clone',
|
|
'url'=>'https://github.com/shaarli/Shaarli/wiki',
|
|
'description'=>'Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login.
|
|
|
|
To learn how to use Shaarli, consult the link "Help/documentation" at the bottom of this page.
|
|
|
|
You use the community supported version of the original Shaarli project, by Sebastien Sauvage.',
|
|
'private'=>0,
|
|
'linkdate'=> date('Ymd_His'),
|
|
'tags'=>'opensource software'
|
|
);
|
|
$this->_links[$link['linkdate']] = $link;
|
|
|
|
$link = array(
|
|
'title'=>'My secret stuff... - Pastebin.com',
|
|
'url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=',
|
|
'description'=>'Shhhh! I\'m a private link only YOU can see. You can delete me too.',
|
|
'private'=>1,
|
|
'linkdate'=> date('Ymd_His', strtotime('-1 minute')),
|
|
'tags'=>'secretstuff'
|
|
);
|
|
$this->_links[$link['linkdate']] = $link;
|
|
|
|
// Write database to disk
|
|
$this->writeDB();
|
|
}
|
|
|
|
/**
|
|
* Reads database from disk to memory
|
|
*/
|
|
private function _readDB()
|
|
{
|
|
|
|
// Public links are hidden and user not logged in => nothing to show
|
|
if ($this->_hidePublicLinks && !$this->_loggedIn) {
|
|
$this->_links = array();
|
|
return;
|
|
}
|
|
|
|
// Read data
|
|
// Note that gzinflate is faster than gzuncompress.
|
|
// See: http://www.php.net/manual/en/function.gzdeflate.php#96439
|
|
$this->_links = array();
|
|
|
|
if (file_exists($this->_datastore)) {
|
|
$this->_links = unserialize(gzinflate(base64_decode(
|
|
substr(file_get_contents($this->_datastore),
|
|
strlen(self::$phpPrefix), -strlen(self::$phpSuffix)))));
|
|
}
|
|
|
|
// If user is not logged in, filter private links.
|
|
if (!$this->_loggedIn) {
|
|
$toremove = array();
|
|
foreach ($this->_links as $link) {
|
|
if ($link['private'] != 0) {
|
|
$toremove[] = $link['linkdate'];
|
|
}
|
|
}
|
|
foreach ($toremove as $linkdate) {
|
|
unset($this->_links[$linkdate]);
|
|
}
|
|
}
|
|
|
|
// Keep the list of the mapping URLs-->linkdate up-to-date.
|
|
$this->_urls = array();
|
|
foreach ($this->_links as $link) {
|
|
$this->_urls[$link['url']] = $link['linkdate'];
|
|
}
|
|
|
|
// Escape links data
|
|
foreach($this->_links as &$link) {
|
|
sanitizeLink($link);
|
|
// Do not use the redirector for internal links (Shaarli note URL starting with a '?').
|
|
if (!empty($this->_redirector) && !startsWith($link['url'], '?')) {
|
|
$link['real_url'] = $this->_redirector . urlencode($link['url']);
|
|
}
|
|
else {
|
|
$link['real_url'] = $link['url'];
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Saves the database from memory to disk
|
|
*
|
|
* @throws IOException the datastore is not writable
|
|
*/
|
|
private function writeDB()
|
|
{
|
|
if (is_file($this->_datastore) && !is_writeable($this->_datastore)) {
|
|
// The datastore exists but is not writeable
|
|
throw new IOException($this->_datastore);
|
|
} else if (!is_file($this->_datastore) && !is_writeable(dirname($this->_datastore))) {
|
|
// The datastore does not exist and its parent directory is not writeable
|
|
throw new IOException(dirname($this->_datastore));
|
|
}
|
|
|
|
file_put_contents(
|
|
$this->_datastore,
|
|
self::$phpPrefix.base64_encode(gzdeflate(serialize($this->_links))).self::$phpSuffix
|
|
);
|
|
|
|
}
|
|
|
|
/**
|
|
* Saves the database from memory to disk
|
|
*
|
|
* @param string $pageCacheDir page cache directory
|
|
*/
|
|
public function savedb($pageCacheDir)
|
|
{
|
|
if (!$this->_loggedIn) {
|
|
// TODO: raise an Exception instead
|
|
die('You are not authorized to change the database.');
|
|
}
|
|
|
|
$this->writeDB();
|
|
|
|
invalidateCaches($pageCacheDir);
|
|
}
|
|
|
|
/**
|
|
* Returns the link for a given URL, or False if it does not exist.
|
|
*
|
|
* @param string $url URL to search for
|
|
*
|
|
* @return mixed the existing link if it exists, else 'false'
|
|
*/
|
|
public function getLinkFromUrl($url)
|
|
{
|
|
if (isset($this->_urls[$url])) {
|
|
return $this->_links[$this->_urls[$url]];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Filter links.
|
|
*
|
|
* @param string $type Type of filter.
|
|
* @param mixed $request Search request, string or array.
|
|
* @param bool $casesensitive Optional: Perform case sensitive filter
|
|
* @param bool $privateonly Optional: Returns private links only if true.
|
|
*
|
|
* @return array filtered links
|
|
*/
|
|
public function filter($type, $request, $casesensitive = false, $privateonly = false)
|
|
{
|
|
$linkFilter = new LinkFilter($this->_links);
|
|
$requestFilter = is_array($request) ? implode(' ', $request) : $request;
|
|
return $linkFilter->filter($type, trim($requestFilter), $casesensitive, $privateonly);
|
|
}
|
|
|
|
/**
|
|
* Returns the list of all tags
|
|
* Output: associative array key=tags, value=0
|
|
*/
|
|
public function allTags()
|
|
{
|
|
$tags = array();
|
|
foreach ($this->_links as $link) {
|
|
foreach (explode(' ', $link['tags']) as $tag) {
|
|
if (!empty($tag)) {
|
|
$tags[$tag] = (empty($tags[$tag]) ? 1 : $tags[$tag] + 1);
|
|
}
|
|
}
|
|
}
|
|
// Sort tags by usage (most used tag first)
|
|
arsort($tags);
|
|
return $tags;
|
|
}
|
|
|
|
/**
|
|
* Returns the list of days containing articles (oldest first)
|
|
* Output: An array containing days (in format YYYYMMDD).
|
|
*/
|
|
public function days()
|
|
{
|
|
$linkDays = array();
|
|
foreach (array_keys($this->_links) as $day) {
|
|
$linkDays[substr($day, 0, 8)] = 0;
|
|
}
|
|
$linkDays = array_keys($linkDays);
|
|
sort($linkDays);
|
|
return $linkDays;
|
|
}
|
|
}
|