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90 lines
3.1 KiB
PHP
90 lines
3.1 KiB
PHP
<?php
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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class ApiFetcher {
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/**
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* Gets a URL. Caches and returns the result, but if the cache has a recent copy
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* return that instead of making the request.
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*
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* Basically, the goal is to stay within the free tier of paid APIs :)
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*
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* @global Medoo $database
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* @param string $url
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* @param array $params key=>value array of URL parameters
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* @param array $extraParams key=>value array of URL parameters that will be ignored when checking the cache
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* @param string $expires When the fetched resource should expire from the cache. A string parsable by strtotime()
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* @return string The content of the requested URL.
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*/
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static function get(string $url, array $params = [], array $extraParams = [], string $expires = "+15 minutes"): string {
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global $database;
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// Delete stale records
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$database->delete("requestcache", ["expires[<=]" => date("Y-m-d H:i:s")]);
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// Make sure the params are in the same order every time
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ksort($params);
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$urlparams = [];
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foreach ($params as $k => $v) {
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$urlparams[] = urlencode($k) . "=" . urlencode($v);
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}
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// Make the URL that will be cached
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$cacheurl = $url . "?" . implode("&", $urlparams);
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foreach ($extraParams as $k => $v) {
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$urlparams[] = urlencode($k) . "=" . urlencode($v);
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}
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if ($database->has("requestcache", ["AND" => ["url" => $cacheurl, "expires[>]" => date("Y-m-d H:i:s")]])) {
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return $database->get("requestcache", "content", ["AND" => ["url" => $cacheurl, "expires[>]" => date("Y-m-d H:i:s")]]);
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}
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// Make the actual URL that will be requested
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$requesturl = $url . "?" . implode("&", $urlparams);
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$content = file_get_contents($requesturl, false, stream_context_create([
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"http" => [
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"user_agent" => "Mozilla/5.0 (PHP) See source.netsyms.com"
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]
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]));
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// Only insert into db if it didn't fail horribly
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if ($content !== FALSE) {
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$database->insert("requestcache", ["url" => $cacheurl, "expires" => date("Y-m-d H:i:s", strtotime($expires)), "content" => $content]);
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}
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return $content;
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}
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/**
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* Clear the given URL from the cache.
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*
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* @global Medoo $database
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* @param string $url
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* @param array $params key=>value array of URL parameters
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*/
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static function removeFromCache(string $url = "", array $params = []) {
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global $database;
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// Make sure the params are in the same order every time
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ksort($params);
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$urlparams = [];
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foreach ($params as $k => $v) {
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$urlparams[] = urlencode($k) . "=" . urlencode($v);
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}
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$cacheurl = $url . "?" . implode("&", $urlparams);
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$database->delete("requestcache", ["url" => $cacheurl]);
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}
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}
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