144 lines
4.4 KiB
PHP
144 lines
4.4 KiB
PHP
<?php
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class Follow
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{
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// constants
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const USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36";
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const ERROR_CURL_INIT = "Couldn't initialize a curl handle";
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const ERROR_CURL_CODE = "Could not curl_getinfo the HTTP code";
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const ERROR_CURL_REDIRECT = "Could not curl_getinfo the redirect URL";
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// properties
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public string $url;
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public string $next;
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public int $code;
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public int $step;
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public bool $redirect;
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public array $path;
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public array $error;
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// constructor
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public function __construct(string $url)
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{
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$this->url = $url;
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$this->next = '';
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$this->code = 0;
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$this->step = 1;
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$this->redirect = false;
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$this->error = [];
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$this->path[$this->step] = [
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'step' => $this->step,
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'url' => $this->url,
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'code' => null,
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'next' => null ];
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}
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// create an error message
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private function setError(array $error): void
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{
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$this->error = $error;
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}
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// add an entry to the URL path
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private function addPath(int $step, array $path): void
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{
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$this->path[$step] = $path;
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}
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// update a path entry
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public function updatePath(int $step, string $key, string $value): void
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{
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$this->path[$step][$key] = $value;
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}
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// create a curl request for a URL
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public function getHttpCode()
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{
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// initate curl request
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$ch = curl_init();
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if (!$ch) {
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$this->setError = ['type' => 'curl', 'message' => self::ERROR_CURL_INIT];
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return false;
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}
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// set request headers and execute
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$response = curl_setopt($ch, CURLOPT_URL, $this->url);
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$response = curl_setopt($ch, CURLOPT_HEADER, true); // enable this for debugging
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$response = curl_setopt($ch, CURLOPT_HTTPGET, true); // redundant but making sure it's a GET
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$response = curl_setopt($ch, CURLOPT_NOBODY, false); // settings this to true was returning 405s
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$response = curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
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$response = curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // return output instead of going to screen
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$response = curl_setopt($ch, CURLOPT_TIMEOUT, 60);
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$response = curl_setopt($ch, CURLOPT_USERAGENT, self::USER_AGENT);
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$response = curl_exec($ch);
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// check for a response
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if (empty($response))
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{
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$this->setError(['type' => 'curl', 'message' => curl_error($ch)]);
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curl_close($ch);
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}
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else
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{
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// get the http status code
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if (curl_getinfo($ch, CURLINFO_HTTP_CODE))
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{
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$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$this->code = ($code) ? $code : 0;
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if ($code == 200) {
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$this->updatePath($this->step, 'code', $this->code);
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return true;
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}
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}
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else
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{
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$this->code = 0;
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$this->setError(['type' => 'curl', 'message' => self::ERROR_CURL_CODE]);
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return false;
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}
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// get any redirect url to follow next
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if (curl_getinfo($ch, CURLINFO_REDIRECT_URL))
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{
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$next = curl_getinfo($ch, CURLINFO_REDIRECT_URL);
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$this->redirect = ($next) ? true : false;
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$this->next = ($next) ? $next : '';
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}
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else
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{
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$this->redirect = false;
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$this->next = '';
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}
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// close the session
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curl_close($ch);
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// update the current path
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$this->updatePath($this->step, 'code', $this->code);
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$this->updatePath($this->step, 'next', $this->next);
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// start the next path
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$this->step++;
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$this->addPath(
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$this->step,
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[
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'step' => $this->step,
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'url' => $this->next,
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'code' => null,
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'next' => null
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]);
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return true;
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}
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// return false if we get here
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return false;
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}
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// get the final URL redirect
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public function getFinalRedirect(): string
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{
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$last = end($this->path);
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return $last['url'];
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}
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}
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?>
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