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<?php
/**
* restWrapper - HTTP stream wrapper, "drop in replacement"
*
* All methods prefixed with stream_ are PHP magic stream methods.
*
* Returns the response content no matter the HTTP response status.
* Supports HTTP/1.1 chunked transfer encodings.
*
* Planned features:
* - HTTP 30x Redirects
* - Write support (i.e. POST/PUT files)
*
* @author Hannes Magnusson <bjori@redpill-linpro.com>
*/
class restWrapper {
// Identical to $http_response_header
public static $lastHeaders = array();
// Must be public so PHP can set it..
public $context;
private $default_options = array();
private $eof = false;
private $contentlen = 0;
// The stream resource
private $fp = null;
// HTTP/1.1 chunked
private $chunked = false;
private $buffer = "";
private $buflen = 0;
public function __construct()
{
$this->default_options = array(
"method" => "GET",
"header" => "", // TODO: Use ini_get();
"user_agent" => "RPL/Wrapper", // TODO: Use ini_get();
"content" => "",
"proxy" => "",
"request_fulluri" => false,
"max_redirects" => 20,
"protocol_version" => "1.1",
"timeout" => 5,
"ignore_errors" => false,
);
}
private function resetProps()
{
// Prevent cross stream contamination
$this->eof = false;
$this->contentlen = 0;
$this->fp = null;
$this->chunked = false;
$this->buffer = "";
$this->bufflen = 0;
}
public function parseHeaders(array $headers)
{
unset($headers[0]);
foreach($headers as $line)
{
list($key, $value) = explode(":", $line, 2);
$value = trim($value);
switch(strtolower($key))
{
case "content-length":
$this->contentlen = $value;
break;
case "transfer-encoding":
$this->chunked = $value == "chunked";
break;
}
}
}
protected function write($buf)
{
$buf .= "\r\n";
//echo $buf;
$len = fwrite($this->fp, $buf);
$buflen = strlen($buf);
if ($len != $buflen)
{
throw new UnexpectedValueException("Cannot write buffer, $len vs $buflen");
}
return true;
}
public function stream_open($path, $mode, $options, $opened_path)
{
$this->resetProps();
$parsed = parse_url($path);
if (!isset($parsed["path"]))
{
$parsed["path"] = "/";
}
if (isset($parsed["query"]))
{
$parsed["query"] = "?" . $parsed["query"];
}
else
{
$parsed["query"] = "";
}
if (!isset($parsed["port"]))
{
$parsed["port"] = $parsed["scheme"] == "https" ? 443 : 80;
}
if (strpbrk($mode, "awx+"))
{
throw new UnexpectedValueException("I don't support writing at the moment");
}
$options = stream_context_get_options($this->context);
if (isset($options["http"]))
{
$options = array_merge($this->default_options, $options["http"]);
}
else
{
$options = $this->default_options;
}
$socket = sprintf("%s://%s:%d", $parsed["scheme"] == "https" ? "ssl" : "tcp", $parsed["host"], $parsed["port"]);
$this->fp = $fp = stream_socket_client($socket, $errno, $errstr, $options["timeout"], STREAM_CLIENT_CONNECT, $this->context);
if (!is_resource($fp))
{
throw new UnexpectedValueException("Connection failed");
}
$this->sendHeaders($options, $parsed);
$headers = $this->streamReadHeaders();
$this->parseHeaders($headers);
return true;
}
protected function sendHeaders($ctx, $url)
{
$buf = sprintf("%s %s%s HTTP/%.1f\r\n", $ctx["method"], $url["path"], $url["query"], $ctx["protocol_version"]);
$buf .= sprintf("Host: %s\r\n", $url["host"]);
// Some webservers require Content-Lenght to be sent before
// Content-Type - which could be part of the user specified header..
// see PHP bug#44603
if ($ctx["content"])
{
if (stripos($ctx["header"], "content-length") === false)
{
$buf .= sprintf("Content-Length: %d\r\n", strlen($ctx["content"]));
}
}
if ($ctx["header"])
{
$buf .= rtrim($ctx["header"]) . "\r\n";
}
// If we have content we _MUST_ send Content-Type headers.. but they
// _SHOULD_ be sent by the user via the "header" key
if ($ctx["content"])
{
if (stripos($buf, "content-type") === false)
{
$buf .= "Content-Type: application/x-www-form-urlencoded\r\n";
trigger_error("Content-type not specified assuming application/x-www-form-urlencoded", E_USER_NOTICE);
}
}
if (isset($url["user"], $url["pass"]))
{
$base = base64_encode($url["user"] . ":" . $url["pass"]);
$buf .= "Authorization: Basic $base\r\n";
}
// TODO: Allow "persistent" connections
$buf .= sprintf("Connection: close\r\n");
if ($ctx["content"])
{
$buf .= "\r\n" . $ctx["content"];
}
return $this->write($buf);
}
public function stream_read($max)
{
// For performance reasons we check right away
if ($this->chunked)
{
//var_dump("Reading chunked");
return $this->streamReadChunked($max);
}
if ($this->contentlen)
{
//var_dump("Reading {$this->contentlen}, but only $max");
static $left = null;
if ($left === null)
{
$left = $this->contentlen;
}
if ($left === 0)
{
// We've read all the content of this response. Reset $left for
// the next request so we get the new contentlen
$left = null;
return null;
}
// If we are asked to read more then the actual content length we
// have to do minor magic
if ($max >= $left)
{
$content = fread($this->fp, $left);
$tmplen = strlen($content);
// If we managed to read everything left of the request
if ($tmplen >= $left)
{
// We tell PHP that. NOTE: We cannot prepare for the next
// request right away as PHP will call us again to make sure
// we have no more data
$left = 0;
$this->eof = true;
}
else
{
// If however the data on the stream was less then we
// requested then we'll have to go again later
$left -= $tmplen;
}
return $content;
}
// We cannot be sure we actually read $max bytes, we have to check
// it explicitly
$content = fread($this->fp, $max);
$left -= strlen($content);
return $content;
}
// We have no idea how much data is on the stream, we'll just have to
// read and read until the stream closes, or PHP doesn't want more
$content = "";
do {
$content .= $line = fread($this->fp, $max);
$max -= strlen($line);
if (feof($this->fp))
{
$this->eof = true;
break;
}
} while($max > 1);
return $content;
}
public function streamReadChunked($max)
{
//echo "\n";
//var_dump($max);
$content = $this->buffer;
$contentlen = $this->buflen;
// If we have enough data in the buffer already we should return it rather
// then keep increasing it
if ($contentlen > $max)
{
$this->buffer = substr($content, $max);
$this->buflen = $contentlen - $max;
$retval = substr($content, 0, $max);
//var_dump("Returning " . strlen($retval) . " I have left: " . strlen($this->buffer));
return $retval;
}
$this->buffer = "";
$this->buflen = 0;
do {
$chunksize = fgets($this->fp);
$chunksize = rtrim($chunksize);
if (!ctype_xdigit($chunksize))
{
return $content;
}
$bufsize = $chunksize = hexdec($chunksize);
//var_dump($bufsize);
if ($bufsize === 0)
{
$this->eof = true;
return $content;
}
do {
$content .= $line = fread($this->fp, $chunksize);
$linelen = strlen($line);
$chunksize -= $linelen;
$contentlen += $linelen;
$this->eof = $eof = feof($this->fp);
} while(!$eof && $chunksize > 0);
// Read the newline marker
if (!$eof)
{
fgets($this->fp);
}
} while(!$eof && $contentlen < $max);
if ($contentlen > $max)
{
$this->buffer = substr($content, $max);
$this->buflen = $contentlen - $max;
$retval = substr($content, 0, $max);
//var_dump("Returning " . strlen($retval) . " I have left: " . strlen($this->buffer));
return $retval;
}
return $content;
}
public function streamReadHeaders()
{
global $http_response_header; // PHP built-in variable
$http_response_header = array();
do {
$line = fgets($this->fp);
if ($line === "\r\n")
{
break;
}
// The new line marker is not supposed to be in the response array
$http_response_header[] = rtrim($line);
} while(true);
// Just so we don't have to do scope magic for $http_response_header
self::$lastHeaders = $http_response_header;
return $http_response_header;
}
public function stream_eof()
{
return !$this->buffer && ($this->eof || feof($this->fp));
}
public function stream_flush()
{
// TODO
// Only relevant when writing, not reading
}
public function stream_stat()
{
// This will never be implemented as none of these values are relevant
return array();
}
public function stream_close()
{
return fclose($this->fp);
}
}
?>
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Skrifað af bjori þann 18. mars 2009 - 12:46
1 athugasemd skrifuð - 
Fjöldi lestra: 545