Versioning and Downloading with HTTP and PHP
Posted: Fri Aug 08, 2008 8:29 am
Dear Board,
perhaps this is usefull for somebody. It's a little include (full source-code below) to
- check the version of an application
- download the newest version
- downloads and checks are count and driven via php-scripts, see below...
to be done is threaded download. Works really great on Mac OS X PB 4.30a1, but I
didn't try in on windows. I use this code inside my litte MlChck to check for a new
version and download on purpose, if wanted. Also to be done is using other
directories than the root...
Be aware, it heavily resides on the php-script. There are some error-checks, but
it's only a work in progress, and to be improved... I will put comments in later
versions of this .pbi
Have phun!
HTTP.pbi
HTTP_Demo.pb - this will check the newest version of MlChck and download it
version.php - really rudimentary, could be made better...
download.php - you will need to set your server-directories according to this script,
or simply change the script. Downloading will not work from here, because I shortened
the script. The directories simply don't exists
perhaps this is usefull for somebody. It's a little include (full source-code below) to
- check the version of an application
- download the newest version
- downloads and checks are count and driven via php-scripts, see below...
to be done is threaded download. Works really great on Mac OS X PB 4.30a1, but I
didn't try in on windows. I use this code inside my litte MlChck to check for a new
version and download on purpose, if wanted. Also to be done is using other
directories than the root...
Be aware, it heavily resides on the php-script. There are some error-checks, but
it's only a work in progress, and to be improved... I will put comments in later
versions of this .pbi
Have phun!
HTTP.pbi
Code: Select all
;- HTTP.pbi
; developed by Jörg Burbach
; - get version-string from PHP-script
; - download files from server
;- todo
; - put download into a thread
; - resume downloads
; - post content (including pictures, and such)
; - use directories (instead of / )
; - Errorcodes
#HTTP_OK = 200
#HTTP_File_Not_Found = 404
#HTTP_Server_Error = 500
#HTTP_No_Connection = 1
#HTTP_Server_Not_Found = 2
#HTTP_No_Size = 3
#CLRF = Chr(13) + Chr(10)
#HTTP_Buffer_Length = 2048
Global *HTTP_Buffer = AllocateMemory(#HTTP_Buffer_Length)
Global *HTTP_Binary_Buffer = 0
Global HTTP_LastAnswer$ = ""
Global HTTP_ErrorCode = 0
Global HTTP_Content$ = ""
Global HTTP_Downloaded_Size = 0 ; contains size of downloaded File when finished
Global HTTP_Downloaded_Name$ = "" ; conatins name of downloaded File when finished
Global HTTP_Arrival_Time = 0 ; contains time left before download completed. If -1 -> finished
; Send Query to Server and waits for Answer
Procedure.l HTTP_Get_From_Server(Connection, Query$, Filedownload = 0) ; OK
If Connection = 0
HTTP_ErrorCode = #HTTP_No_Connection
Else
SendNetworkString(Connection, Query$) ; Send to connected Server
Result = ReceiveNetworkData(Connection, *HTTP_Buffer, #HTTP_Buffer_Length) ; Bytes read
Temp$ = PeekS(*HTTP_Buffer, Result) ; save whole Answer
Position = FindString(Temp$, "HTTP/1.1 ", 0) + Len("HTTP/1.1 ") ; find HTTP/1.1 xyz
Laenge = FindString(Temp$, " ", Position) - Position ;
HTTP_ErrorCode = Val(Mid(Temp$, Position, Laenge)) ; read Errorcode
If FindString(Temp$, "This File Does Not Exist!", 0) <> 0
ProcedureReturn #HTTP_File_Not_Found
EndIf
If HTTP_ErrorCode = #HTTP_OK ; no error (= 200)
Position = FindString(Temp$, "Content-Length: ", 0) + Len("Content-Length: "); find "Content-Length: "
Laenge = FindString(Temp$, #CLRF, Position) - Position ;
If Position = 0 Or Laenge = 0 ; no?
HTTP_File_Len = 1024 * 1024 * 2 ; allocate 2mb buffer
Else ;
HTTP_File_Len = Val(Mid(Temp$, Position, Laenge)) ; else size was told
EndIf ;
If HTTP_File_Len > Result
*Back_Buffer = AllocateMemory(HTTP_File_Len)
Speicher = Result
CopyMemory(*HTTP_Buffer, *Back_Buffer, Result)
While Result <> 0 ;HTTP_Laenge > Speicher
Result = ReceiveNetworkData(Connection, *Back_Buffer + Speicher, HTTP_File_Len)
Speicher = Speicher + Result
HTTP_Downloaded_Size = Speicher
Wend
HTTP_LastAnswer$ = PeekS(*Back_Buffer, Speicher)
If Filedownload
If *HTTP_Binary_Buffer
FreeMemory(*HTTP_Binary_Buffer)
EndIf
*HTTP_Binary_Buffer = AllocateMemory(HTTP_File_Len)
CopyMemory(*Back_Buffer + Speicher - HTTP_File_Len, *HTTP_Binary_Buffer, HTTP_File_Len)
Position = FindString(HTTP_LastAnswer$, "filename=", 0) + 10
Laenge = FindString(HTTP_LastAnswer$, Chr(34), Position)
HTTP_Downloaded_Name$ = Mid(HTTP_LastAnswer$, Position, Laenge - Position)
EndIf
FreeMemory(*Back_Buffer)
Else
HTTP_LastAnswer$ = PeekS(*HTTP_Buffer, Result) ; save whole Answer
EndIf
HTTP_Content$ = Mid(HTTP_LastAnswer$, Len(HTTP_LastAnswer$) - HTTP_File_Len + 1, HTTP_File_Len) ; save Content only
HTTP_ErrorCode = 0
Else
HTTP_ErrorCode = #HTTP_No_Size
EndIf
EndIf
ProcedureReturn HTTP_ErrorCode
EndProcedure
; Produces Query-String for Requesting Data of Webserver
Procedure.s HTTP_Make_Get(URL$, File$, Parameter$ = "0") ; OK
If Parameter$ <> "0" : Param$ = "?" + Parameter$ : Else : Param$ = "" : EndIf
Query$ = "GET /" + File$ + Param$ + " HTTP/1.1" + #CLRF
Query$ + "Host: " + URL$ + #CLRF
Query$ + "Connection: Close" + #CLRF + #CLRF
ProcedureReturn Query$
EndProcedure
; Produces Head-Query for requesting only information without data
Procedure.s HTTP_Make_Head(URL$, File$, Parameter$) ; OK
If Parameter$ <> "0" : Param$ = "?" + Parameter$ : Else : Param$ = "" : EndIf
Query$ = "HEAD /" + File$ + Param$ + " HTTP/1.1" + #CLRF
Query$ + "Host: " + URL$ + #CLRF
Query$ + "Connection: Close" + #CLRF + #CLRF
ProcedureReturn Query$
EndProcedure
; Connect to HTTP-Server Server$ on a given Port, Default = 80
; gives back Handle of Connection
Procedure.l HTTP_Connect_Server(Server$, Port = 80) ; OK
Connection = OpenNetworkConnection(Server$, Port)
If Connection = 0
HTTP_ErrorCode = #HTTP_Server_Not_Found
Else
HTTP_ErrorCode = #HTTP_OK
EndIf
ProcedureReturn Connection
EndProcedure
; Disconnect from Server using handle Connection
Procedure.l HTTP_Disconnect_Server(Connection) ; OK
If Connection <> 0
ProcedureReturn CloseNetworkConnection(Connection)
EndIf
EndProcedure
; Check Version from URL-File, gives back a string like "x.yy" or -1 if failed
Procedure.s HTTP_Get_File_Version(Server$, Port, Application$) ; OK
Checker = HTTP_Connect_Server(Server$, Port)
Query$ = HTTP_Make_Get(Server$, "version.php", "software=" + Application$)
HTTP_Get_From_Server(Checker,Query$)
HTTP_Disconnect_Server(Checker)
ProcedureReturn HTTP_Content$
EndProcedure
; Download a certain File from a Server, see PHP-script for more information
Procedure.l HTTP_Get_File(Server$, Port, Application$)
Checker = HTTP_Connect_Server(Server$, Port)
Query$ = HTTP_Make_Get(Server$, "download.php", "download=" + Application$)
If HTTP_Get_From_Server(Checker, Query$, 1) <> #HTTP_File_Not_Found
HTTP_Disconnect_Server(Checker)
ProcedureReturn #HTTP_OK
EndIf
ProcedureReturn #HTTP_File_Not_Found
EndProcedureCode: Select all
InitNetwork()
Debug http_Get_file_version("www.server.de", 80, "MlChck")
Debug http_Get_File("www.server.de", 80, "MlChck")
Debug "download complete: " + HTTP_Downloaded_Name$
CreateFile(0,HTTP_Downloaded_Name$)
WriteData(0, *HTTP_Binary_Buffer, HTTP_Downloaded_Size)
CloseFile(0)Code: Select all
<?php
if ($_GET["software"] == "MlChck") { echo "0.99"; } else { echo "-1"; }
?>or simply change the script. Downloading will not work from here, because I shortened
the script. The directories simply don't exists
Code: Select all
<?php
function output_file($file,$name)
{
//do something on download abort/finish
//register_shutdown_function( 'function_name' );
if(!file_exists($file)) die('This File Does Not Exist!');
$size = filesize($file);
$name = rawurldecode($name);
if (ereg('Opera(/| )([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT']))
$UserBrowser = "Opera";
elseif (ereg('MSIE ([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT']))
$UserBrowser = "IE";
else
$UserBrowser = '';
/// important for download im most browser
$mime_type = ($UserBrowser == 'IE' || $UserBrowser == 'Opera') ? 'application/octetstream' : 'application/octet-stream';
@ob_end_clean(); /// decrease cpu usage extreme
header('Content-Type: ' . $mime_type);
header('Content-Disposition: attachment; filename="'.$name.'"');
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header('Accept-Ranges: bytes');
header("Cache-control: private");
header('Pragma: private');
///// multipart-download and resume-download
if(isset($_SERVER['HTTP_RANGE'])) {
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE']);
str_replace($range, "-", $range);
$size2 = $size-1;
$new_length = $size-$range;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range$size2/$size");
} else {
$size2=$size-1;
header("Content-Length: ".$size);
}
$chunksize = 1*(1024*1024);
$bytes_send = 0;
if ($file = fopen($file, 'r')) {
if(isset($_SERVER['HTTP_RANGE'])) fseek($file, $range);
while(!feof($file) and (connection_status()==0)) {
$buffer = fread($file, $chunksize);
print($buffer);//echo($buffer); // is also possible
flush();
$bytes_send += strlen($buffer);
//sleep(1);//// decrease download speed
}
fclose($file);
} else die('error can not open file');
if(isset($new_length)) $size = $new_length;
die();
}
// which file to download, which filename
output_file("downloads/" . $_GET["download"] . ".zip", $_GET["download"] . ".zip");
?>