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187 lines
5.1 KiB
187 lines
5.1 KiB
<?php
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namespace p3k\XRay;
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class Fetcher {
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private $http;
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public function __construct($http) {
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$this->http = $http;
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}
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public function fetch($url, $opts=[]) {
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if($opts == false) $opts = [];
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if(isset($opts['timeout']))
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$this->http->set_timeout($opts['timeout']);
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if(isset($opts['max_redirects']))
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$this->http->set_max_redirects($opts['max_redirects']);
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// Attempt some basic URL validation
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if(!in_array($scheme, ['http','https'])) {
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return [
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'error_code' => 400,
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'error' => 'invalid_url',
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'error_description' => 'Only http and https URLs are supported'
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];
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}
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$host = parse_url($url, PHP_URL_HOST);
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if(!$host) {
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return [
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'error_code' => 400,
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'error' => 'invalid_url',
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'error_description' => 'The URL provided was not valid'
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];
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}
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$url = normalize_url($url);
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$host = parse_url($url, PHP_URL_HOST);
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// Check if this is a Twitter URL and use the API
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if(Formats\Twitter::matches_host($url)) {
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return $this->_fetch_tweet($url, $opts);
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}
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// Check if this is a Facebook URL and use the API
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if(Formats\Facebook::matches_host($url)) {
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return $this->_fetch_facebook($url, $opts);
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}
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// Transform the HTML GitHub URL into an GitHub API request and fetch the API response
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if(Formats\GitHub::matches_host($url)) {
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return $this->_fetch_github($url, $opts);
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}
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// Check if this is a Hackernews URL and use the API
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if(Formats\Hackernews::matches($url)) {
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return Formats\Hackernews::fetch($this->http, $url, $opts);
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}
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// All other URLs are fetched normally
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// Special-case appspot.com URLs to not follow redirects.
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// https://cloud.google.com/appengine/docs/php/urlfetch/
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if(!should_follow_redirects($url)) {
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$this->http->set_max_redirects(0);
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$this->http->set_transport(new \p3k\HTTP\Stream());
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} else {
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$this->http->set_transport(new \p3k\HTTP\Curl());
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}
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$headers = [];
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if(isset($opts['token']))
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$headers[] = 'Authorization: Bearer ' . $opts['token'];
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$result = $this->http->get($url, $headers);
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if($result['error']) {
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return [
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'error' => $result['error'],
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'error_description' => $result['error_description'],
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'url' => $result['url'],
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'code' => $result['code'],
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];
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}
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if(trim($result['body']) == '') {
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if($result['code'] == 410) {
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// 410 Gone responses are valid and should not return an error
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return $this->respond($response, 200, [
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'data' => [
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'type' => 'unknown'
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],
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'url' => $result['url'],
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'code' => $result['code']
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]);
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}
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return [
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'error' => 'no_content',
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'error_description' => 'We did not get a response body when fetching the URL',
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'url' => $result['url'],
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'code' => $result['code']
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];
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}
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// Check for HTTP 401/403
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if($result['code'] == 401) {
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return [
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'error' => 'unauthorized',
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'error_description' => 'The URL returned "HTTP 401 Unauthorized"',
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'url' => $result['url'],
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'code' => $result['code']
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];
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}
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if($result['code'] == 403) {
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return [
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'error' => 'forbidden',
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'error_description' => 'The URL returned "HTTP 403 Forbidden"',
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'url' => $result['url'],
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'code' => $result['code']
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];
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}
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// If the original URL had a fragment, include it in the final URL
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if(($fragment=parse_url($url, PHP_URL_FRAGMENT)) && !parse_url($result['url'], PHP_URL_FRAGMENT)) {
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$result['url'] .= '#'.$fragment;
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}
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return [
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'url' => $result['url'],
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'body' => $result['body'],
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'code' => $result['code'],
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];
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}
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private function _fetch_tweet($url, $opts) {
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$fields = ['twitter_api_key','twitter_api_secret','twitter_access_token','twitter_access_token_secret'];
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$creds = [];
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foreach($fields as $f) {
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if(isset($opts[$f]))
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$creds[$f] = $opts[$f];
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}
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if(count($creds) < 4) {
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return [
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'error_code' => 400,
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'error' => 'missing_parameters',
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'error_description' => 'All 4 Twitter credentials must be included in the request'
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];
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}
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return Formats\Twitter::fetch($url, $creds);
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}
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private function _fetch_facebook($url, $opts) {
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$fields = ['facebook_app_id','facebook_app_secret'];
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$creds = [];
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foreach($fields as $f) {
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if(isset($opts[$f]))
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$creds[$f] = $opts[$f];
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}
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if(count($creds) < 2) {
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return [
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'error_code' => 400,
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'error' => 'missing_parameters',
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'error_description' => 'Both Facebook credentials must be included in the request'
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];
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}
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// TODO: Question, should I do this like Twitter or like Github?
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return Formats\Facebook::fetch($url, $creds);
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}
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private function _fetch_github($url, $opts) {
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$fields = ['github_access_token'];
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$creds = [];
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foreach($fields as $f) {
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if(isset($opts[$f]))
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$creds[$f] = $opts[$f];
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}
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return Formats\GitHub::fetch($this->http, $url, $creds);
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}
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}
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