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<?php
function on_post() {
$WEBSITE_CATEGORY = 'page_url';
$DOWNLOADS_FOLDER = getenv('ARCHIVES_DIR');
$website_url = $_POST[$WEBSITE_CATEGORY];
$currentPage = new DownloadPage($website_url, $DOWNLOADS_FOLDER);
}
class DownloadPage {
private $folder_location;
private $folder_name;
private $page_url;
private $page_contents;
function __construct($page_url, $folder_location) {
$this->folder_location = $folder_location;
$this->page_url = $page_url;
list($website_exists, $this->page_url) = $this->doesWebsiteExist($this->page_url);
// Search for all the regexes that fit the *url* pattern where the pattern is the requested url but without the protocol
$page_url_pattern = $this->getCorrectLinkPattern($page_url);
$simular_pages = Database\Webpage::getArchivePathsByPattern('%' . $page_url_pattern . '%');
if ($website_exists) {
$this->folder_name = Database\Webpage::create($folder_location, $page_url, 1);
$this->page_contents = $this->downloadFile($this->page_url);
$this->createArchive($simular_pages);
} else {
echo "Website does not exist";
}
}
function getCorrectLinkPattern($page_url) : string {
$page_url = substr($page_url, strpos($page_url, "//"), strlen($page_url));
return $page_url;
}
function setFolderLocation($folder_location) : void {
$this->folder_location = $folder_location;
}
function setFolderName($folder_name) : void {
$this->folder_name = $folder_name;
}
function setPageUrl($page_url) : void {
$this->page_url = $page_url;
}
function applyCorrectProtocol($url, $protocol) : string {
if (str_contains($url, $protocol)) {
return $url;
}
return $protocol . $url;
}
function downloadFile($url) : string {
$curl_func = curl_init($url);
curl_setopt($curl_func, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_func, CURLOPT_FOLLOWLOCATION, true);
$page_contents = curl_exec($curl_func);
curl_close($curl_func);
return $page_contents;
}
function doesWebsiteExist($url) : array {
// Check if the site exists with https
$https_url = $this->applyCorrectProtocol($url, "https://");
if ($https_url != $url) {
$url_headers = @get_headers($https_url);
if ($url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found') {
return array(true, $https_url);
}
}
// Check if the site exists with http
$http_url = $this->applyCorrectProtocol($url, "http://");
if ($http_url != $url) {
$url_headers = @get_headers($http_url);
if ($url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found') {
return array(true, $http_url);
}
}
// Check if the site exists as is
// Will take effect when the user has entered the https/http protocol with the site
$url_headers = @get_headers($url);
if ($url_headers && $url_headers[0] != 'HTTP/1.1 404 Not Found') {
return array(true, $url);
}
return array(false, $url);
}
function resolveUrl($relativeUrl, $baseUrl) : string {
// If the url is already absolute return it
if (parse_url($relativeUrl, PHP_URL_SCHEME)) {
return $relativeUrl;
}
// Otherwise resolve it agains the base url
return rtrim($baseUrl, '/') . '/' . ltrim($relativeUrl, '/');
}
function downloadSource(&$dom, $folder_path, $tagName, $attribute, $simular_pages) : void {
$links = $dom->getElementsByTagName($tagName);
foreach($links as $link) {
$source = $link->getAttribute($attribute);
if ($source) {
$sourceUrl = $this->resolveUrl($source, $this->page_url);
if ($this->isResourceAccessible($sourceUrl)) {
$sourceContent = $this->downloadFile($sourceUrl);
if ($sourceContent) {
$found_resource = false;
if (count($simular_pages) != 0) {
// Page is not unique so check if any other already downloaded resource is
// the same as the resource that is needed thus not actually needing to download it
foreach($simular_pages as $page) {
$resourceName = basename($source);
if (!file_exists($this->folder_location . "/" . $page->WID . "/" . $resourceName)) {
continue;
}
$resourceContents = file_get_contents($this->folder_location . "/" . $page->WID . "/" . $resourceName);
if (strlen($resourceContents) == strlen($sourceContent) && md5($resourceContents) == md5($sourceContent)) {
// They are the same resource
// change the link to point to the source of the previous archive instead of downloading a news source
$link->setAttribute($attribute, "../" . $page->WID . "/" . $resourceName);
$found_resource = true;
break;
}
}
}
if (!$found_resource) {
// Page is unique so there will be no resource that can be cached
$link->setAttribute($attribute, './' . basename($source));
$file = fopen($folder_path . '/' . basename($source), "w");
fwrite($file, $sourceContent);
fclose($file);
}
}
}
}
}
}
function isResourceAccessible($url) : bool {
$curl_func = curl_init($url);
curl_setopt($curl_func, CURLOPT_NOBODY, true); // Gives only the headers
curl_setopt($curl_func, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_func, CURLOPT_FOLLOWLOCATION, true);
curl_exec($curl_func);
$code = curl_getinfo($curl_func, CURLINFO_HTTP_CODE);
curl_close($curl_func);
return ($code >= 200 && $code < 400);
}
function createArchive($simular_pages) : void {
// Creates the folder with the correct resources and the main html page in a index.html tag
$dom = new DOMDocument();
@$dom->loadHTML($this->page_contents); // This suppresses warnings for invalid HTML
$folder_path = $this->folder_location . '/' . $this->folder_name;
if (!file_exists($folder_path)) {
mkdir($folder_path, 0777, true);
}
$this->downloadSource($dom, $folder_path, 'link', 'href', $simular_pages);
$this->downloadSource($dom, $folder_path, 'script', 'src', $simular_pages);
$this->downloadSource($dom, $folder_path, 'img', 'src', $simular_pages);
$this->page_contents = $dom->saveHTML();
$indexFile = fopen($folder_path . '/index.html', "w");
fwrite($indexFile, $this->page_contents);
fclose($indexFile);
echo "Archived {$this->page_url}";
}
}
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