439 lines
13 KiB
PHP
439 lines
13 KiB
PHP
<?php
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/**
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* Data storage for links.
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*
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* This object behaves like an associative array.
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*
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* Example:
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* $myLinks = new LinkDB();
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* echo $myLinks['20110826_161819']['title'];
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* foreach ($myLinks as $link)
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* echo $link['title'].' at url '.$link['url'].'; description:'.$link['description'];
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*
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* Available keys:
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* - description: description of the entry
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* - linkdate: date of the creation of this entry, in the form YYYYMMDD_HHMMSS
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* (e.g.'20110914_192317')
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* - private: Is this link private? 0=no, other value=yes
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* - tags: tags attached to this entry (separated by spaces)
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* - title Title of the link
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* - url URL of the link. Can be absolute or relative.
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* Relative URLs are permalinks (e.g.'?m-ukcw')
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*
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* Implements 3 interfaces:
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* - ArrayAccess: behaves like an associative array;
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* - Countable: there is a count() method;
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* - Iterator: usable in foreach () loops.
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*/
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class LinkDB implements Iterator, Countable, ArrayAccess
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{
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// Links are stored as a PHP serialized string
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private $datastore;
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// Datastore PHP prefix
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protected static $phpPrefix = '<?php /* ';
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// Datastore PHP suffix
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protected static $phpSuffix = ' */ ?>';
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// List of links (associative array)
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// - key: link date (e.g. "20110823_124546"),
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// - value: associative array (keys: title, description...)
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private $links;
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// List of all recorded URLs (key=url, value=linkdate)
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// for fast reserve search (url-->linkdate)
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private $urls;
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// List of linkdate keys (for the Iterator interface implementation)
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private $keys;
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// Position in the $this->keys array (for the Iterator interface)
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private $position;
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// Is the user logged in? (used to filter private links)
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private $loggedIn;
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// Hide public links
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private $hidePublicLinks;
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/**
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* Creates a new LinkDB
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*
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* Checks if the datastore exists; else, attempts to create a dummy one.
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*
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* @param $isLoggedIn is the user logged in?
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*/
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function __construct($datastore, $isLoggedIn, $hidePublicLinks)
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{
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$this->datastore = $datastore;
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$this->loggedIn = $isLoggedIn;
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$this->hidePublicLinks = $hidePublicLinks;
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$this->checkDB();
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$this->readdb();
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}
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/**
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* Countable - Counts elements of an object
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*/
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public function count()
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{
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return count($this->links);
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}
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/**
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* ArrayAccess - Assigns a value to the specified offset
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*/
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public function offsetSet($offset, $value)
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{
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// TODO: use exceptions instead of "die"
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if (!$this->loggedIn) {
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die('You are not authorized to add a link.');
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}
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if (empty($value['linkdate']) || empty($value['url'])) {
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die('Internal Error: A link should always have a linkdate and URL.');
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}
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if (empty($offset)) {
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die('You must specify a key.');
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}
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$this->links[$offset] = $value;
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$this->urls[$value['url']]=$offset;
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}
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/**
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* ArrayAccess - Whether or not an offset exists
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*/
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public function offsetExists($offset)
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{
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return array_key_exists($offset, $this->links);
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}
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/**
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* ArrayAccess - Unsets an offset
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*/
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public function offsetUnset($offset)
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{
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if (!$this->loggedIn) {
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// TODO: raise an exception
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die('You are not authorized to delete a link.');
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}
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$url = $this->links[$offset]['url'];
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unset($this->urls[$url]);
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unset($this->links[$offset]);
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}
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/**
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* ArrayAccess - Returns the value at specified offset
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*/
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public function offsetGet($offset)
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{
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return isset($this->links[$offset]) ? $this->links[$offset] : null;
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}
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/**
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* Iterator - Returns the current element
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*/
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function current()
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{
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return $this->links[$this->keys[$this->position]];
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}
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/**
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* Iterator - Returns the key of the current element
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*/
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function key()
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{
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return $this->keys[$this->position];
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}
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/**
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* Iterator - Moves forward to next element
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*/
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function next()
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{
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++$this->position;
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}
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/**
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* Iterator - Rewinds the Iterator to the first element
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*
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* Entries are sorted by date (latest first)
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*/
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function rewind()
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{
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$this->keys = array_keys($this->links);
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rsort($this->keys);
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$this->position = 0;
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}
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/**
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* Iterator - Checks if current position is valid
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*/
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function valid()
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{
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return isset($this->keys[$this->position]);
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}
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/**
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* Checks if the DB directory and file exist
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*
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* If no DB file is found, creates a dummy DB.
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*/
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private function checkDB()
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{
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if (file_exists($this->datastore)) {
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return;
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}
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// Create a dummy database for example
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$this->links = array();
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$link = array(
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'title'=>' Shaarli: the personal, minimalist, super-fast, no-database delicious clone',
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'url'=>'https://github.com/shaarli/Shaarli/wiki',
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'description'=>'Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login.
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To learn how to use Shaarli, consult the link "Help/documentation" at the bottom of this page.
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You use the community supported version of the original Shaarli project, by Sebastien Sauvage.',
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'private'=>0,
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'linkdate'=> date('Ymd_His'),
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'tags'=>'opensource software'
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);
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$this->links[$link['linkdate']] = $link;
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$link = array(
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'title'=>'My secret stuff... - Pastebin.com',
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'url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=',
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'description'=>'Shhhh! I\'m a private link only YOU can see. You can delete me too.',
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'private'=>1,
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'linkdate'=> date('Ymd_His', strtotime('-1 minute')),
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'tags'=>'secretstuff'
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);
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$this->links[$link['linkdate']] = $link;
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// Write database to disk
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// TODO: raise an exception if the file is not write-able
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file_put_contents(
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$this->datastore,
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self::$phpPrefix.base64_encode(gzdeflate(serialize($this->links))).self::$phpSuffix
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);
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}
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/**
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* Reads database from disk to memory
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*/
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private function readdb()
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{
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// Public links are hidden and user not logged in => nothing to show
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if ($this->hidePublicLinks && !$this->loggedIn) {
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$this->links = array();
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return;
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}
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// Read data
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// Note that gzinflate is faster than gzuncompress.
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// See: http://www.php.net/manual/en/function.gzdeflate.php#96439
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$this->links = array();
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if (file_exists($this->datastore)) {
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$this->links = unserialize(gzinflate(base64_decode(
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substr(file_get_contents($this->datastore),
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strlen(self::$phpPrefix), -strlen(self::$phpSuffix)))));
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}
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// If user is not logged in, filter private links.
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if (!$this->loggedIn) {
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$toremove = array();
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foreach ($this->links as $link) {
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if ($link['private'] != 0) {
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$toremove[] = $link['linkdate'];
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}
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}
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foreach ($toremove as $linkdate) {
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unset($this->links[$linkdate]);
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}
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}
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// Keep the list of the mapping URLs-->linkdate up-to-date.
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$this->urls = array();
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foreach ($this->links as $link) {
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$this->urls[$link['url']] = $link['linkdate'];
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}
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// Escape links data
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foreach($this->links as &$link) {
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sanitizeLink($link);
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}
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}
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/**
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* Saves the database from memory to disk
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*/
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public function savedb()
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{
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if (!$this->loggedIn) {
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// TODO: raise an Exception instead
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die('You are not authorized to change the database.');
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}
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file_put_contents(
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$this->datastore,
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self::$phpPrefix.base64_encode(gzdeflate(serialize($this->links))).self::$phpSuffix
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);
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invalidateCaches();
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}
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/**
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* Returns the link for a given URL, or False if it does not exist.
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*/
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public function getLinkFromUrl($url)
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{
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if (isset($this->urls[$url])) {
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return $this->links[$this->urls[$url]];
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}
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return false;
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}
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/**
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* Returns the list of links corresponding to a full-text search
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*
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* Searches:
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* - in the URLs, title and description;
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* - are case-insensitive.
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*
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* Example:
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* print_r($mydb->filterFulltext('hollandais'));
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*
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* mb_convert_case($val, MB_CASE_LOWER, 'UTF-8')
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* - allows to perform searches on Unicode text
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* - see https://github.com/shaarli/Shaarli/issues/75 for examples
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*/
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public function filterFulltext($searchterms)
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{
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// FIXME: explode(' ',$searchterms) and perform a AND search.
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// FIXME: accept double-quotes to search for a string "as is"?
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$filtered = array();
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$search = mb_convert_case($searchterms, MB_CASE_LOWER, 'UTF-8');
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$keys = array('title', 'description', 'url', 'tags');
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foreach ($this->links as $link) {
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$found = false;
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foreach ($keys as $key) {
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if (strpos(mb_convert_case($link[$key], MB_CASE_LOWER, 'UTF-8'),
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$search) !== false) {
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$found = true;
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}
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}
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if ($found) {
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$filtered[$link['linkdate']] = $link;
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}
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}
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krsort($filtered);
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return $filtered;
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}
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/**
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* Returns the list of links associated with a given list of tags
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*
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* You can specify one or more tags, separated by space or a comma, e.g.
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* print_r($mydb->filterTags('linux programming'));
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*/
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public function filterTags($tags, $casesensitive=false)
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{
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// Same as above, we use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
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// FIXME: is $casesensitive ever true?
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$t = str_replace(
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',', ' ',
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($casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8'))
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);
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$searchtags = explode(' ', $t);
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$filtered = array();
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foreach ($this->links as $l) {
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$linktags = explode(
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' ',
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($casesensitive ? $l['tags']:mb_convert_case($l['tags'], MB_CASE_LOWER, 'UTF-8'))
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);
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if (count(array_intersect($linktags, $searchtags)) == count($searchtags)) {
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$filtered[$l['linkdate']] = $l;
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}
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}
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krsort($filtered);
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return $filtered;
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}
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/**
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* Returns the list of articles for a given day, chronologically sorted
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*
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* Day must be in the form 'YYYYMMDD' (e.g. '20120125'), e.g.
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* print_r($mydb->filterDay('20120125'));
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*/
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public function filterDay($day)
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{
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// TODO: check input format
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$filtered = array();
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foreach ($this->links as $l) {
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if (startsWith($l['linkdate'], $day)) {
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$filtered[$l['linkdate']] = $l;
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}
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}
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ksort($filtered);
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return $filtered;
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}
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/**
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* Returns the article corresponding to a smallHash
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*/
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public function filterSmallHash($smallHash)
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{
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$filtered = array();
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foreach ($this->links as $l) {
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if ($smallHash == smallHash($l['linkdate'])) {
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// Yes, this is ugly and slow
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$filtered[$l['linkdate']] = $l;
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return $filtered;
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}
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}
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return $filtered;
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}
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/**
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* Returns the list of all tags
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* Output: associative array key=tags, value=0
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*/
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public function allTags()
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{
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$tags = array();
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foreach ($this->links as $link) {
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foreach (explode(' ', $link['tags']) as $tag) {
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if (!empty($tag)) {
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$tags[$tag] = (empty($tags[$tag]) ? 1 : $tags[$tag] + 1);
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}
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}
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}
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// Sort tags by usage (most used tag first)
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arsort($tags);
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return $tags;
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}
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/**
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* Returns the list of days containing articles (oldest first)
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* Output: An array containing days (in format YYYYMMDD).
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*/
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public function days()
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{
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$linkDays = array();
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foreach (array_keys($this->links) as $day) {
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$linkDays[substr($day, 0, 8)] = 0;
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}
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$linkDays = array_keys($linkDays);
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sort($linkDays);
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return $linkDays;
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}
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}
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?>
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