478 lines
15 KiB
PHP
478 lines
15 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: creation date of this entry, format: YYYYMMDD_HHMMSS
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* (e.g.'20110914_192317')
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* - updated: last modification date of this entry, format: YYYYMMDD_HHMMSS
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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. Used for displayable links (no redirector, relative, etc.).
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* Can be absolute or relative.
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* Relative URLs are permalinks (e.g.'?m-ukcw')
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* - real_url Absolute processed URL.
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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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// Link date storage format
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const LINK_DATE_FORMAT = 'Ymd_His';
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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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// link redirector set in user settings.
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private $redirector;
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/**
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* Set this to `true` to urlencode link behind redirector link, `false` to leave it untouched.
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*
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* Example:
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* anonym.to needs clean URL while dereferer.org needs urlencoded URL.
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*
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* @var boolean $redirectorEncode parameter: true or false
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*/
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private $redirectorEncode;
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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 string $datastore datastore file path.
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* @param boolean $isLoggedIn is the user logged in?
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* @param boolean $hidePublicLinks if true all links are private.
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* @param string $redirector link redirector set in user settings.
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* @param boolean $redirectorEncode Enable urlencode on redirected urls (default: true).
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*/
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function __construct(
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$datastore,
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$isLoggedIn,
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$hidePublicLinks,
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$redirector = '',
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$redirectorEncode = true
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)
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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->redirector = $redirector;
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$this->redirectorEncode = $redirectorEncode === true;
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$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']] = $link;
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// Write database to disk
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$this->writeDB();
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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[$linkdate]);
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}
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}
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$this->urls = array();
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foreach ($this->links as &$link) {
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// Keep the list of the mapping URLs-->linkdate up-to-date.
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$this->urls[$link['url']] = $link['linkdate'];
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// Sanitize data fields.
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sanitizeLink($link);
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// Remove private tags if the user is not logged in.
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if (! $this->loggedIn) {
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$link['tags'] = preg_replace('/(^|\s+)\.[^($|\s)]+\s*/', ' ', $link['tags']);
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}
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// Do not use the redirector for internal links (Shaarli note URL starting with a '?').
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if (!empty($this->redirector) && !startsWith($link['url'], '?')) {
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$link['real_url'] = $this->redirector;
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if ($this->redirectorEncode) {
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$link['real_url'] .= urlencode(unescape($link['url']));
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} else {
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$link['real_url'] .= $link['url'];
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}
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}
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else {
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$link['real_url'] = $link['url'];
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}
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}
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}
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/**
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* Saves the database from memory to disk
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*
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* @throws IOException the datastore is not writable
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*/
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private function writeDB()
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{
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if (is_file($this->datastore) && !is_writeable($this->datastore)) {
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// The datastore exists but is not writeable
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throw new IOException($this->datastore);
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} else if (!is_file($this->datastore) && !is_writeable(dirname($this->datastore))) {
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// The datastore does not exist and its parent directory is not writeable
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throw new IOException(dirname($this->datastore));
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}
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file_put_contents(
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$this->datastore,
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self::$phpPrefix.base64_encode(gzdeflate(serialize($this->links))).self::$phpSuffix
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);
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}
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/**
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* Saves the database from memory to disk
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*
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* @param string $pageCacheDir page cache directory
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*/
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public function savedb($pageCacheDir)
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{
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if (!$this->loggedIn) {
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// TODO: raise an Exception instead
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die('You are not authorized to change the database.');
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}
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$this->writeDB();
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invalidateCaches($pageCacheDir);
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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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* @param string $url URL to search for
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*
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* @return mixed the existing link if it exists, else 'false'
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*/
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public function getLinkFromUrl($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 shaare corresponding to a smallHash.
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*
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* @param string $request QUERY_STRING server parameter.
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*
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* @return array $filtered array containing permalink data.
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*
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* @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link.
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*/
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public function filterHash($request)
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{
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$request = substr($request, 0, 6);
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$linkFilter = new LinkFilter($this->links);
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return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request);
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}
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/**
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* Returns the list of articles for a given day.
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*
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* @param string $request day to filter. Format: YYYYMMDD.
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*
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* @return array list of shaare found.
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*/
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public function filterDay($request) {
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$linkFilter = new LinkFilter($this->links);
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return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request);
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}
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/**
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* Filter links according to search parameters.
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*
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* @param array $filterRequest Search request content. Supported keys:
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* - searchtags: list of tags
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* - searchterm: term search
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* @param bool $casesensitive Optional: Perform case sensitive filter
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* @param bool $privateonly Optional: Returns private links only if true.
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*
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* @return array filtered links, all links if no suitable filter was provided.
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*/
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public function filterSearch($filterRequest = array(), $casesensitive = false, $privateonly = false)
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{
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// Filter link database according to parameters.
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$searchtags = !empty($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : '';
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$searchterm = !empty($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : '';
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// Search tags + fullsearch.
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if (! empty($searchtags) && ! empty($searchterm)) {
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$type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT;
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$request = array($searchtags, $searchterm);
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}
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// Search by tags.
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elseif (! empty($searchtags)) {
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$type = LinkFilter::$FILTER_TAG;
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$request = $searchtags;
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}
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// Fulltext search.
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elseif (! empty($searchterm)) {
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$type = LinkFilter::$FILTER_TEXT;
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$request = $searchterm;
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}
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// Otherwise, display without filtering.
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else {
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$type = '';
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$request = '';
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}
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$linkFilter = new LinkFilter($this->links);
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return $linkFilter->filter($type, $request, $casesensitive, $privateonly);
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}
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/**
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* Returns the list of all tags
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* Output: associative array key=tags, value=0
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*/
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public function allTags()
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{
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$tags = array();
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$caseMapping = array();
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foreach ($this->links as $link) {
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foreach (preg_split('/\s+/', $link['tags'], 0, PREG_SPLIT_NO_EMPTY) as $tag) {
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if (empty($tag)) {
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continue;
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}
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// The first case found will be displayed.
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if (!isset($caseMapping[strtolower($tag)])) {
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$caseMapping[strtolower($tag)] = $tag;
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$tags[$caseMapping[strtolower($tag)]] = 0;
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}
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$tags[$caseMapping[strtolower($tag)]]++;
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}
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}
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// Sort tags by usage (most used tag first)
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arsort($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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