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<?php
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namespace Ako\Shorturl\Drivers;
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use Illuminate\Support\Str;
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use Ako\Shorturl\Models\Link;
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class LocalDriver implements BaseDriver
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{
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protected $props = [];
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protected $config, $main_str, $head, $tail, $base_url, $path;
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public function __construct ()
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{
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$this->config = config('shorturl.drivers.local');
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$this->main_str = $this->config['str_shuffled'];
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$this->head = $this->main_str[0];
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$this->tail = $this->main_str[strlen($this->main_str) - 1];
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$this->checkCaseSensitive ();
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}
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/**
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* @param string $url
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*
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* @return string
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*/
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public function expand (string $url) :string
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{
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$this->parseUrl($url);
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$link = Link::where("short_path", $this->path)->first();
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if ($link) {
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$link->increment("clicks");
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return $link->base_url . "/" . $link->long_path;
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}
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return "";
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}
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/**
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* @param string $url
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*
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* @return string
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* @throws \Exception
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*/
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public function shorten (string $url) :string
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{
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$this->parseUrl ($url);
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// Check if given url has been shorten previously
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$duplicate = Link::where(['long_path' => $this->path])->first();
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if ($duplicate)
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return $duplicate->base_url . "/" . $duplicate->short_path;
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$short_path = $this->getNextShortpath();
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try {
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Link::create([
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"long_path" => $this->path,
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"short_path" => $short_path,
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'base_url' => $this->base_url,
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'properties' => $this->props]
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);
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} catch (\Exception $e) {
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// If it is duplicate entry exception
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// try to insert a new entry
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if ($e instanceof \Illuminate\Database\QueryException && $e->getCode() == "23000") {
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return $this->shorten($url);
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}
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}
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return $this->base_url . "/" . $short_path;
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}
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/**
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* Git the first short url
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*
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* @return string
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*/
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private function getFirstUrl () : string
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{
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$min_length = $this->config['min_length'];
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$short_path = "";
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for ($i = 0; $i < $min_length; $i++)
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$short_path .= $this->head;
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return $short_path;
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}
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/**
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*
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* Get the next short url based on the given item (it gets permutations one by one)
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*
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* @param string $current_perm
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* @return string
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*/
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private function findNextPerm (string $current_perm) :string
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{
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if (!strlen($current_perm))
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return $this->head;
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$arr = array_reverse(str_split($current_perm));
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foreach($arr as $key => $current_char) {
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if ($current_char == $this->tail) {
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$current_perm = Str::replaceLast($current_char, "", $current_perm);
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return $this->findNextPerm($current_perm) . $this->head;
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}
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$next_char = str_split(Str::after($this->main_str, $current_char))[0];
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return Str::replaceLast($current_char, $next_char, $current_perm);
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}
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}
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/**
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* @param array $props
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*
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* @return LocalDriver
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*/
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public function withProperties (array $props = []) :LocalDriver
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{
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$this->props = array_merge($this->props, $props);
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return $this;
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}
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private function parseUrl (string $url)
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{
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$parse = parse_url($url);
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$path = "";
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if ($parse['path'] ?? null)
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$path .= str::replaceFirst("/", "", $parse['path']);
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if ($parse['query'] ?? null)
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$path .= "?" . $parse['query'];
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if ($parse['fragment'] ?? null)
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$path .= "#" . $parse['fragment'];
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$this->base_url = str_replace("/" . $path, "", $url);
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$this->path = $path;
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}
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private function checkCaseSensitive ()
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{
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if ((!$this->config['case_sensitive'] ?? null)) {
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// Remove upper cases from main string
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$this->main_str = preg_replace("/(.)\\1+/", "$1", strtolower($this->main_str));
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}
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}
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/**
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143
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* @return string
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*/
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private function getNextShortpath () : string
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{
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$tbl = (new Link)->getTable();
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// Get latest short_path(s)
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// As multiple instances could be created at the same timestamp which we get
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// the latest one based on that
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// so we must find the latest one(short_path) in the permutation of the main_str
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$latest = collect(\DB::select("SELECT short_path FROM $tbl WHERE created_at = (SELECT MAX(created_at) FROM $tbl)"));
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if (!$latest->count())
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return $this->getFirstUrl();
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if ($latest->count() == 1) {
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return $this->findNextPerm($latest->first()->short_path);
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}
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else {
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foreach ($latest->reverse() as $key => $item) {
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$next = $this->findNextPerm($item->short_path);
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164
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// If next permutation of current item is in fetched items
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165
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// find next permutation of the next fetched one
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if (!$latest->contains("short_path", $next))
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return $next;
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}
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}
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}
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} |
akoSalman /
Shorturl
Loading history...
Checks if undeclared accessed properties appear in database migrations and if the creating migration is correct.