function receivePage($url_to_crawl, $referer_url)
{
// Check if tmp-file was set by the user, otherwise set a default one
if ($this->tmp_file == "") {
$this->tmp_file = uniqid(time()) . ".tmp";
}
// Define some vars
$source_read = "";
$bytes_received = 0;
$stream_to_memory = false;
$stream_to_file = false;
// Split the url to crawl into its elements (host, path, port and stuff)
$url_parts = PHPCrawlerUtils::splitURL($url_to_crawl);
$protocol = $url_parts["protocol"];
$host = $url_parts["host"];
$path = $url_parts["path"];
$query = $url_parts["query"];
$file = $url_parts["file"];
$port = $url_parts["port"];
// If the host was already visited so far
// -> get the ip from our host-ip-array, otherwise
// get the IP and add the entry to the array.
if (isset($this->host_ip_table[$host])) {
$ip = $this->host_ip_table[$host];
} else {
$ip = $this->host_ip_table[$host] = gethostbyname($host);
// Host switched and wasnt "visited" before.
// So read the robots.txt-file for this new host (if wanted)
if ($this->use_robots_txt_files == true) {
$this->robotsTxtHandler->processRobotsTxt($protocol, $host, $port, $this->user_agent_string);
}
}
// Is this URL allowed to be requested by the robots.txt-file of this host?
$url_disallowed = false;
if ($this->use_robots_txt_files == true) {
$host_url = $protocol . $host . ":" . $port;
$url_disallowed = $this->robotsTxtHandler->checkIfUrlDisallowed($url_to_crawl, $host_url);
}
// Check the protocol (http or https) and build the
// host-string for fsockopen
if ($protocol == "https://") {
$host_str = "ssl://" . $ip;
} else {
$host_str = $ip;
}
// normal connect
// Check if an authentication should be send
$authentication = PHPCrawlerUtils::getAuthenticationForURL($this->basic_authentications, $url_to_crawl);
// Error-codes
// 0 - couldnt connect to server / page within timeout-time
// 1 - stopped reading from socket, read-timeout reached BEFORE EOF()
// Open socket-connection
if ($url_disallowed == false) {
$s = @fsockopen($host_str, $port, $e, $t, $this->socket_mean_timeout);
} else {
return false;
// Return false if the URL was completely ignored
}
if ($s == false) {
$error_string = $t;
$error_code = $e;
if ($t == "" && $e == "") {
$error_code = 0;
$error_string = "Couldn't connect to server";
}
} else {
$header_found = false;
// will get true if the header of the page was extracted
// Build header to send
$headerlines_to_send[] = "GET " . $path . $file . $query . " HTTP/1.0\r\n";
$headerlines_to_send[] = "HOST: " . $host . "\r\n";
// Referer
if ($referer_url != "") {
$headerlines_to_send[] = "Referer: {$referer_url}\r\n";
}
// Cookies
if ($this->handle_cookies == true) {
$cookie_string = PHPCrawlerUtils::buildHeaderCookieString($this->cookies, $host);
}
if (isset($cookie_string)) {
$headerlines_to_send[] = "Cookie: " . $cookie_string . "\r\n";
}
// Authentication
if (count($authentication) > 0) {
$auth_string = base64_encode($authentication["username"] . ":" . $authentication["password"]);
$headerlines_to_send[] = "Authorization: Basic " . $auth_string . "\r\n";
}
// Rest of header
$headerlines_to_send[] = "User-Agent: " . str_replace("\n", "", $this->user_agent_string) . "\r\n";
$headerlines_to_send[] = "Connection: close\r\n";
$headerlines_to_send[] = "\r\n";
// Now send the header
for ($x = 0; $x < count($headerlines_to_send); $x++) {
// Send header-line
fputs($s, $headerlines_to_send[$x]);
// Put together lines to $header_send
if (isset($header_send)) {
$header_send .= $headerlines_to_send[$x];
} else {
$header_send = $headerlines_to_send[$x];
}
}
unset($header_lines);
$status = socket_get_status($s);
// Now read from socket
// UNTIL timeout reached OR eof() OR content-type shouldnt be followed
// OR traffic-limit reached or ...
while (!isset($stop)) {
socket_set_timeout($s, $this->socket_read_timeout);
// Read from socket
$line_read = @fgets($s, 1024);
// The @ is to avoid the strange "SSL fatal protocol error"-warning that
// appears in some environments without any reasons
$source_read .= $line_read;
// do this anyway
// If we want the content in tmp-file -> write line to TMP-file
if ($header_found == true && $stream_to_file == true && $line_read) {
unset($check);
$check = @fwrite($fp, $line_read);
if ($check == false) {
$error_code = "2000";
$error_string = "Couldn't write to TMP-file " . $this->tmp_file;
}
}
// Count bytes of the content (not the header)
if ($header_found == true) {
$bytes_received = $bytes_received + strlen($line_read);
}
// Check for traffic limit and stop receiving if reached
if ($this->traffic_limit_complete_page == false && $this->traffic_limit_all > 0) {
if (strlen($source_read) + $this->traffic_all > $this->traffic_limit_all) {
$stop = true;
$received_completly = false;
$page_data["traffic_limit_reached"] = true;
}
}
// Check for pagesize-limit
if ($header_found == true && $bytes_received > $this->pagesize_limit && $this->pagesize_limit > 0) {
$stop = true;
$received_completly = false;
}
// "Cut" Header in seperate var $header and handle it
if ($header_found == false && substr($source_read, -4, 4) == "\r\n\r\n") {
$header = substr($source_read, 0, strlen($source_read) - 2);
$actual_content_type = PHPCrawlerUtils::getHeaderTag("content-type", $header);
$source_read = "";
$header_found = true;
// Get the http-status-code
$http_status_code = PHPCrawlerUtils::getHTTPStatusCode($header);
// Should this content-type be streamed into memory (true/false) ?
$stream_to_memory = PHPCrawlerUtils::decideStreamToMemory($header, $this->receive_to_memory_matches);
// Should this content-type be streamed into tmp-file (true/false) ?
$stream_to_file = PHPCrawlerUtils::decideStreamToTmpFile($header, $this->receive_to_file_matches);
// No ? then open TMP-file for the stream
if ($stream_to_file == true) {
$fp = @fopen($this->tmp_file, "w");
if ($fp == false) {
$error_code = "2000";
$error_string = "Couldn't open TMP-file" . $this->tmp_file;
}
}
// Header found here -> check if source should be followed (content-type)
$follow = PHPCrawlerUtils::decideFollow($header, $this->follow_content_type);
// no ?? then stop with this page !
if ($follow == false) {
$stop = true;
} else {
$received_completly = true;
// just init, may switch later on !
}
// Check if a cookie was send with the header and store it
// (if wanted)
if ($this->handle_cookies == true) {
PHPCrawlerUtils::getCookieData($header, $this->cookies, $host);
}
}
// end cut and handle header
// Get status of socket to check timeout and EOF
$status = socket_get_status($s);
// Now, if the source-buffer is filled or EOF is reached
// -> look for links in the buffer, put the found links into
// array $links_found_in_page and then empty the buffer BUT
// COPY THE LAST FEW BYTES of the old buffer into the new one !
// This has to be done because of links that take more than a single
// line !
// And yes, only makes sense if we dont want to have the whole content
// in memory anyway AND if the content-type is text/html!
if ($header_found == true && $stream_to_memory == false) {
if (strlen($source_read) >= 100000 || $status["eof"] == true) {
if (preg_match("/text\\/html/ i", $actual_content_type)) {
$links_found_in_buffer = PHPCrawlerUtils::findLinks($source_read, $links_found_in_page, $this->aggressive_link_extraction, $this->linktags_to_extract, $page_url_map);
$source_read = substr($source_read, -1500);
}
}
}
// Check timeout
if ($status["timed_out"] == true) {
$error_code = 1000;
// ahem..which int to give ??
$error_string = "socketstream timed out";
$stop = true;
$received_completly = false;
}
// Check eof
if ($status["eof"] == true) {
$stop = true;
}
}
fclose($s);
// close socket
if (isset($fp) && $fp != false) {
fclose($fp);
}
// close tmp file if used
}
// echo "Get page:".($this->getmicrotime() - $start);
// Now, HERE, if the whole content/source was received into memory,
// we are looking for the links in the complete source (faster)
// it only makes sense if content-type is text/html !
if ($stream_to_memory == true) {
unset($links_found_in_page);
if (preg_match("/text\\/html/ i", $actual_content_type)) {
// $start = $this->getmicrotime();
PHPCrawlerUtils::findLinks($source_read, $links_found_in_page, $this->aggressive_link_extraction, $this->linktags_to_extract, $page_url_map);
// echo "Find links:".($this->getmicrotime() - $start);
}
}
// Add the "refering_url" to the array-elements
if (isset($links_found_in_page)) {
for ($x = 0; $x < count($links_found_in_page); $x++) {
$links_found_in_page[$x]["referer_url"] = $url_to_crawl;
}
}
// Page crawled,
// return header, source, followed (true/false) and all we got here
unset($page_data);
if (isset($error_code)) {
$page_data["error_code"] = $error_code;
} else {
$page_data["error_code"] = false;
}
if (isset($error_string)) {
$page_data["error_string"] = $error_string;
} else {
$page_data["error_string"] = false;
}
if (isset($follow)) {
$page_data["received"] =& $follow;
} else {
$page_data["received"] = false;
}
if (isset($received_completly)) {
$page_data["received_completly"] =& $received_completly;
} else {
$page_data["received_completly"] = false;
}
$page_data["received_completely"] =& $page_data["received_completly"];
// Wrote "completely" it wrong in prev. version,
if (isset($bytes_received)) {
$page_data["bytes_received"] = $bytes_received;
} else {
$page_data["bytes_received"] = 0;
}
if (isset($header)) {
$page_data["header"] =& $header;
} else {
$page_data["header"] = false;
}
if (isset($http_status_code)) {
$page_data["http_status_code"] =& $http_status_code;
} else {
$page_data["http_status_code"] = false;
}
if (isset($actual_content_type)) {
$page_data["content_type"] = $actual_content_type;
} else {
$page_data["content_type"] = false;
}
// TMP-file infos and that
$page_data["content_tmp_file"] = $page_data["received_to_file"] = false;
$page_data["source"] = $page_data["content"] = $page_data["received_to_memory"] = false;
if (isset($page_data["received"])) {
if ($stream_to_file == true) {
$page_data["content_tmp_file"] = $this->tmp_file;
$page_data["received_to_file"] = true;
}
if ($stream_to_memory == true) {
$page_data["source"] =& $source_read;
$page_data["content"] =& $source_read;
$page_data["received_to_memory"] = true;
}
}
// Additional infos for the override-function handlePageData()
$page_data["protocol"] = $protocol;
$page_data["port"] = $port;
$page_data["host"] = $host;
$page_data["path"] = $path;
$page_data["file"] = $file;
$page_data["query"] = $query;
$page_data["header_send"] =& $header_send;
$page_data["referer_url"] = $referer_url;
// "Normailzed" URL and referer-URL (f.e. without port if port is 80 and protocol is http)
$page_data["url"] = $url_to_crawl;
// All links found in this page
$page_data["links_found"] =& $links_found_in_page;
// Increase SUM of traffic alltogether this instance received
$this->traffic_all = $this->traffic_all + strlen($page_data["header"]) + $page_data["bytes_received"];
// Set flag if traffic-limit is reached
if ($this->traffic_all > $this->traffic_limit_all && $this->traffic_limit_all != 0) {
$page_data["traffic_limit_reached"] = true;
}
if (!isset($page_data["traffic_limit_reached"])) {
$page_data["traffic_limit_reached"] = false;
}
return $page_data;
}