568 lines
18 KiB
PHP
568 lines
18 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 $myLinks[350]['title'];
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* foreach ($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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* - id: primary key, incremental integer identifier (persistent)
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* - description: description of the entry
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* - created: creation date of this entry, DateTime object.
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* - updated: last modification date of this entry, DateTime object.
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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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* - shorturl Permalink smallhash
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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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* ID mechanism:
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* ArrayAccess is implemented in a way that will allow to access a link
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* with the unique identifier ID directly with $link[ID].
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* Note that it's not the real key of the link array attribute.
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* This mechanism is in place to have persistent link IDs,
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* even though the internal array is reordered by date.
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* Example:
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* - DB: link #1 (2010-01-01) link #2 (2016-01-01)
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* - Order: #2 #1
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* - Import links containing: link #3 (2013-01-01)
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* - New DB: link #1 (2010-01-01) link #2 (2016-01-01) link #3 (2013-01-01)
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* - Real order: #2 #3 #1
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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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// 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=link offset)
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// for fast reserve search (url-->link offset)
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private $urls;
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/**
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* @var array List of all links IDS mapped with their array offset.
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* Map: id->offset.
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*/
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protected $ids;
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// List of offset 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 $redirectorEncode Enable urlencode on redirected urls (default: true).
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*/
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public function __construct(
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$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->check();
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$this->read();
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}
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/**
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* Countable - Counts elements of an object
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*/
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public function count()
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{
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return count($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 (!isset($value['id']) || empty($value['url'])) {
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die('Internal Error: A link should always have an id and URL.');
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}
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if (($offset !== null && ! is_int($offset)) || ! is_int($value['id'])) {
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die('You must specify an integer as a key.');
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}
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if ($offset !== null && $offset !== $value['id']) {
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die('Array offset and link ID must be equal.');
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}
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// If the link exists, we reuse the real offset, otherwise new entry
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$existing = $this->getLinkOffset($offset);
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if ($existing !== null) {
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$offset = $existing;
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} else {
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$offset = count($this->links);
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}
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$this->links[$offset] = $value;
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$this->urls[$value['url']] = $offset;
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$this->ids[$value['id']] = $offset;
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}
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/**
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* ArrayAccess - Whether or not an offset exists
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*/
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public function offsetExists($offset)
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{
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return array_key_exists($this->getLinkOffset($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 (!$this->loggedIn) {
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// TODO: raise an exception
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die('You are not authorized to delete a link.');
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}
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$realOffset = $this->getLinkOffset($offset);
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$url = $this->links[$realOffset]['url'];
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unset($this->urls[$url]);
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unset($this->ids[$realOffset]);
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unset($this->links[$realOffset]);
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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($offset)
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{
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$realOffset = $this->getLinkOffset($offset);
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return isset($this->links[$realOffset]) ? $this->links[$realOffset] : 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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public function current()
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{
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return $this[$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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public 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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public function next()
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{
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++$this->position;
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}
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/**
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* Iterator - Rewinds the Iterator to the first element
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*
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* Entries are sorted by date (latest first)
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*/
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public function rewind()
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{
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$this->keys = array_keys($this->ids);
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$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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public 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 check()
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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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$link = array(
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'id' => 1,
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'title'=>' Shaarli: the personal, minimalist, super-fast, no-database delicious clone',
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'url'=>'https://shaarli.readthedocs.io',
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'description'=>'Welcome to Shaarli! This is your first public bookmark. To edit or delete me, you must first login.
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To learn how to use Shaarli, consult the link "Help/documentation" at the bottom of this page.
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You use the community supported version of the original Shaarli project, by Sebastien Sauvage.',
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'private'=>0,
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'created'=> new DateTime(),
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'tags'=>'opensource software'
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);
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$link['shorturl'] = link_small_hash($link['created'], $link['id']);
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$this->links[1] = $link;
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$link = array(
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'id' => 0,
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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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'created'=> new DateTime('1 minute ago'),
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'tags'=>'secretstuff',
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);
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$link['shorturl'] = link_small_hash($link['created'], $link['id']);
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$this->links[0] = $link;
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// Write database to disk
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$this->write();
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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 read()
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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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$this->links = array();
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return;
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}
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$this->links = FileUtils::readFlatDB($this->datastore, []);
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$toremove = array();
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foreach ($this->links as $key => &$link) {
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if (! $this->loggedIn && $link['private'] != 0) {
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// Transition for not upgraded databases.
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$toremove[] = $key;
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continue;
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}
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// Sanitize data fields.
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sanitizeLink($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'] = $link['url'];
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}
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// To be able to load links before running the update, and prepare the update
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if (! isset($link['created'])) {
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$link['id'] = $link['linkdate'];
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$link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']);
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if (! empty($link['updated'])) {
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$link['updated'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['updated']);
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}
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$link['shorturl'] = smallHash($link['linkdate']);
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}
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}
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// If user is not logged in, filter private links.
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foreach ($toremove as $offset) {
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unset($this->links[$offset]);
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}
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$this->reorder();
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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 write()
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{
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FileUtils::writeFlatDB($this->datastore, $this->links);
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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 $pageCacheDir page cache directory
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*/
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public function save($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->write();
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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 string $visibility return only all/private/public links
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* @param string $untaggedonly return only untagged links
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*
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* @return array filtered links, all links if no suitable filter was provided.
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*/
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public function filterSearch($filterRequest = array(), $casesensitive = false, $visibility = 'all', $untaggedonly = false)
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{
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// Filter link database according to parameters.
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$searchtags = isset($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : '';
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$searchterm = isset($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : '';
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// Search tags + fullsearch - blank string parameter will return all links.
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$type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; // == "vuotext"
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$request = [$searchtags, $searchterm];
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$linkFilter = new LinkFilter($this);
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return $linkFilter->filter($type, $request, $casesensitive, $visibility, $untaggedonly);
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}
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/**
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* Returns the list tags appearing in the links with the given tags
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* @param $filteringTags: tags selecting the links to consider
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* @param $visibility: process only all/private/public links
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* @return: a tag=>linksCount array
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*/
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public function linksCountPerTag($filteringTags = [], $visibility = 'all')
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{
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$links = empty($filteringTags) ? $this->links : $this->filterSearch(['searchtags' => $filteringTags], false, $visibility);
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$tags = array();
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$caseMapping = array();
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foreach ($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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* Rename or delete a tag across all links.
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*
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* @param string $from Tag to rename
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* @param string $to New tag. If none is provided, the from tag will be deleted
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*
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* @return array|bool List of altered links or false on error
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*/
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public function renameTag($from, $to)
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{
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if (empty($from)) {
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return false;
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}
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$delete = empty($to);
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// True for case-sensitive tag search.
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$linksToAlter = $this->filterSearch(['searchtags' => $from], true);
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foreach($linksToAlter as $key => &$value)
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{
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$tags = preg_split('/\s+/', trim($value['tags']));
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if (($pos = array_search($from, $tags)) !== false) {
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if ($delete) {
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unset($tags[$pos]); // Remove tag.
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} else {
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$tags[$pos] = trim($to);
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}
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$value['tags'] = trim(implode(' ', array_unique($tags)));
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$this[$value['id']] = $value;
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}
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}
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return $linksToAlter;
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}
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/**
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* Returns the list of days containing articles (oldest first)
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* Output: An array containing days (in format YYYYMMDD).
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*/
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public function days()
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{
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$linkDays = array();
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foreach ($this->links as $link) {
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$linkDays[$link['created']->format('Ymd')] = 0;
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}
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$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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* Reorder links by creation date (newest first).
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*
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* Also update the urls and ids mapping arrays.
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*
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* @param string $order ASC|DESC
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*/
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public function reorder($order = 'DESC')
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{
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$order = $order === 'ASC' ? -1 : 1;
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// Reorder array by dates.
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usort($this->links, function($a, $b) use ($order) {
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return $a['created'] < $b['created'] ? 1 * $order : -1 * $order;
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});
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$this->urls = array();
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$this->ids = array();
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foreach ($this->links as $key => $link) {
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$this->urls[$link['url']] = $key;
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$this->ids[$link['id']] = $key;
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}
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}
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/**
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* Return the next key for link creation.
|
|
* E.g. If the last ID is 597, the next will be 598.
|
|
*
|
|
* @return int next ID.
|
|
*/
|
|
public function getNextId()
|
|
{
|
|
if (!empty($this->ids)) {
|
|
return max(array_keys($this->ids)) + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Returns a link offset in links array from its unique ID.
|
|
*
|
|
* @param int $id Persistent ID of a link.
|
|
*
|
|
* @return int Real offset in local array, or null if doesn't exist.
|
|
*/
|
|
protected function getLinkOffset($id)
|
|
{
|
|
if (isset($this->ids[$id])) {
|
|
return $this->ids[$id];
|
|
}
|
|
return null;
|
|
}
|
|
}
|