<%
Option Explicit

' If this is your first time here, read the instructions after the configuration
' variables, just setting the conf. variables below might not be enough.
' See "Instructions" further down...

' ******* Configuration Variables ********
Dim fbtAddress, fbtPath

' * fbtAddress: location of the Fast BugTrack server.
' It's almost certainly the address below - unless you've changed the port...
' Put here your fbt server url. PLEASE don't put any folders in this URL!
' oportunity to do this below. Don't add a trailing slash either.
' examples:
' If it's running on the same machine as IIS:
fbtAddress = "http://127.0.0.1:10000"
' If it's running on a different machine behind your firewall (put the 
' apporopriate IP address / port...:
'fbtAddress = "http://192.168.0.100:10000"


' The following should be your virtual host directory under IIS:
' If our virtual host is under the "test" directory:
fbtPath = "/test"

' * Advanced configuration variables
Dim forceProtocol, forceHost, forcePort

' CJ: Probably best not to touch these...
' * forceXXX: force the values of where Zope will pretend to be
' These variables should be used when you need to use a load
' balancer, accelerator or other reverse proxy in front of IIS
' that doesn't forward, for instance, the "Host:" variable correctly.
' In this case, this script would guess wrong values for where
' Zope is pretending to be located. LEAVE THEM AS EMPTY STRINGS
' IF YOU WANT THIS SCRIPT TO GUESS THE VALUES FOR ITSELF (RECOMENDED)
' examples:
' forceProtocol = "https"
' forceHost = "accelerator.example.com"
' forcePort = "81"
forceProtocol = ""
forceHost = ""
forcePort = ""

' * Really Advanced "DON'T TOUCH THIS UNLESS YOU ABSOLUTELY KNOW WHAT
'   YOU'RE DOING" variables
Dim WinHTTPProgID

' * WinHTTPProgID: The ProgID of the WinHTTP Request object, used to make
' HTTP requests on server side components. This should be
' "WinHttp.WinHttpRequest.5.1" unless you have WinNT 4, in which case you
' have to install the WinHTTP 5.0 component (google for 'download winhttp
' msdn', without the quotes) and change WinHTTPProgID to
' "WinHttp.WinHttpRequest.5". Since MS intends to discontinue the
' distribution of this component, WinNT4 users won't have where to go,
' unless we start distributing it, which we don't intend to.
WinHTTPProgID = "WinHttp.WinHttpRequest.5.1"

' ******** End of configuration variables ********

' ******** Instructions ********

' * Add a Virtual Host Monster to the root of your Zope, if you don't
'   already have one. Any id will do. Don't bother configuring it.
'
' * Put the address of the  server in the fbtAddress variable as
'   documented above
'
' * Put the path to the virtual host folder
'
' * Put this file in the IIS folder you want to serve FBT from, e.g.
'   if you want to serve FBT from the root of the IIS server, you
'   should put this file in the C:\Inetpub\wwwroot folder. If you
'   want to serve FBT from, say "http://iis.server/someFolder",
'   you should put it in C:\Inetpub\wwwroot\someFolder.
'
' * Open the IIS Manager (in Win2k it's in "Control Panel ->
'   Administrative Tools -> Internet Services Manager").
'
' * If you want to serve fbt from IIS root, right click "Default Web
'   Site", otherwise right click the folder you want to serve FBT
'   from, and choose "Properties".
'
' * In the "Custom Errors" tab, scroll down to find error 404, click
'   "Edit Properties", choose "URL" in the "Message Type" drop down
'   and type "/default.asp", if you want to serve FBT from IIS root,
'   or "/someFolder/default.asp" if you want to serve FBT from
'   "http://iis.serve/someFolder/"
'
' * Repeat the above for the 405 error
'
' * Make sure you've got "Default.asp" in the "Documents" tab
'
' * Enjoy!
'
' How it works:
'
' You define this page as the error handler for Not Found errors (404 
' and 405). 404 is a GET not found and 405 is a POST not found
' IIS does NOT send back the 404 header initially, but rather
' it passes the handling off to this page.  This is not well-documented
' and somewhat non-standard, but very useful.

' The originally requested page headers and request parameters are
' extracted and then reformulated into a new request to the FBT server
' which can be on the same machine or even somewhere else
' The request is made via HTTP and the result returned to the client
' as if it came from this server.
'
' If you're browsing directly at the folder were you put this file
' the process is a little different, but the result is the same.
' Look below if you want details

' ******** End of instructions ********

' ******** Copyright and License Info ********
' This file is an edited version of the default.asp script from the
' Zope folks and the following individuals/organizations below...
' - Chris Justus - Alcea Technologies Inc 2003.

' Copyright Hiperlogica Informatica e Educacao Ltda,
' January 2003

' This file is an almost complete rewrite of Andy McKay's error.asp
' found at http://www.fbt.org/Members/andym/ASP404
' Copyright Andy McKay
' February 2002
'
' Andy's error.asp is a modification of the 
' on found at http://www.wc.cc.va.us/dtod/fbt/
' from David Carter Tod.
' No Copyright information

' This file is licensed under the ZPL Version 2
' http://www.fbt.org/Resources/ZPL

' ******** End copyright and License Info ********

' The modified Zope code below...
' Not actually comments made by Alcea / CJ for the most part unless marked CJ

Class RequestInfo
    ' Convenience placeholder for request information

    '"http" or "https"
    Dim protocol

    ' IIS server hostname, as seen in the browser url
    Dim host

    ' http port as a string, usually "80"
    Dim port

    ' the path and query-string part of the url
    Dim url

    ' path to the folder this script is in, with trailing slash
    Dim iisPath

    ' the parts of the above array
    Dim iisPathArray

    ' the above path with "_vh_" prefix in each step
    ' as needed by the Virtual Host Monster, with trailing slash
    Dim vhmIISPath

    Sub Class_Initialize
        ' Misnomer, it should be Instance_Initialize, but what does MS know?

        host = split(Request.ServerVariables("HTTP_HOST"),":")(0)
        ' why am I splitting?! because IIS puts, say, a ":81" at the end of the HTTP_HOST variable
        ' if SERVER_PORT is not 80
        ' Why don't I use it to get the port variable below?! because they don't put :80 if it's 80
        ' and I need it there!
        ' Gotta love MS consistency...
	' Why am I using HTTP_HOST instead of SERVER_NAME? because HTTP_HOST comes from the
	' browser, so I can be sure that urls generated with it can actually reach us.
	' And why am I using this instead of the servername from the query string? because I don't
	' trust it. It doesn't come with the port number when it's not :80, so it's definetly assembled.
	' The HTTP_HOST variable comes straight from the browser.

        iisPath = Request.serverVariables("PATH_INFO")
	' "/some/path/error.asp -> "/some/path"
	' or "/error.asp" -> ""
	iisPath = left(iisPath, inStrRev(iisPath, "/") - 1)
	
	'"/some/path" -> ["some", "path"] or
	'"" -> []
	iisPathArray = split(mid(iisPath, 2),"/")

        '"/some/path" -> "/some/path/" or
	'"" -> "/"
        iisPath = iisPath & "/"

	vhmIISPath = "/"
	Dim name
	For Each name in iisPathArray 
            vhmIISPath = vhmIISPath & "_vh_" & name & "/"
	Next

	port = Request.ServerVariables("SERVER_PORT")
	protocol = "http"
	If Request.ServerVariables("HTTPS") <> "off" Then
	    protocol = "https"
	End If

	Dim fullQuery
	fullQuery = Request.ServerVariables("QUERY_STRING")
	'Response.write("URL1: " & fullQuery & "<br>")
	If fullQuery = "" Then
            ' We're in directory-listing-mode, and the imbecile IIS doesn't give us anything on QUERY_STRING.
	    ' Let's fake one
	   fullQuery = "http://server" & iisPath
	Else
	    ' "404;http://iis.server/some/path?some=querystring" -> "http://iis.server/some/path?some=querystring"
            if ( InStr(fullQuery,";") <> 0) Then
	      fullQuery = split(fullQuery,";",2)(1)
            End If
	End If
	' "http://iis.server/some/path?some=querystring" -> ["http", "", "iis.server", "some/path?some=querystring"]
	'CJ - FBT logic is different - serves all sorts of content...
	' this makes things abit more flexible...
        if (InStr(fullQuery,"http") <> 0) Then 
          url = "/" & split(fullQuery, "/", 4)(3)
	Else
	  url = fbtPath & "/?" & fullQuery
        End If
	'Response.write("URL: " & url)
	'Response.end
    End Sub

End Class

Sub copyHeadersFromBrowser(fbtServer)
    ' copy request headers from the Request object to the WinHTTP object
    ' removing a few unwanted ones
    dim bValidHeader
    dim hLine, hPair, hName, hValue
    for each hLine in split(Request.ServerVariables("ALL_RAW"), vbnewline)
        bValidHeader = true
        if trim(hLine) <> "" then
            hPair=split(hLine, ": ", 2)
            hName=hPair(0)
            hValue=hPair(1)
	    Dim lhName
	    lhName = LCase(hName)
            if lhName = "if-modified-since" then
	        ' the presence of this header is causing slowdowns and
	        ' timeouts with IE 5+ on Windos and Mac. Other browsers
	        ' seem unaffected. We need to explore this further.
                bValidHeader = false
            end if
            if lhName = "host" then
                bValidHeader = false
            end if
            if bValidHeader then
                fbtServer.setRequestHeader hName, hValue
            end if
        end if
    next
End Sub

Sub copyHeadersToBrowser(fbtServer)
    ' copy response headers from the WinHTTP object to the Request object
    ' removing a few unwanted ones
    dim bValidHeader
    dim hLine, hPair, hName, hValue
    for each hLine in split(fbtServer.getallResponseHeaders(), vbnewline)
        bValidHeader = true
        if trim(hLine) <> "" then
            hPair=split(hLine, ":", 2)
            hName=hPair(0)
            hValue=trim(hPair(1))
	    ' Response.addHeader only adds headers. it doesn't replace them
	    ' so we remove the ones that would duplicate
	    Dim lhName
	    lhName = LCase(hName)
            if lhName = "server" then
	        'we pretend we are IIS of the Borg
                bValidHeader = false
            end if
            if lhName = "content-type" then
	        ' there's a specific function to set Content-Type:
                Response.ContentType = hValue
                bValidHeader = false
            end if
            if lhName = "cache-control" then
	        ' ditto for Cache-Control:
		Response.CacheControl = hValue
                bValidHeader = false
            end if
            if lhName = "expires" then
	        ' ditto for Expires:
		Response.ExpiresAbsolute = hValue
                bValidHeader = false
            end if
            if lhName = "content-length" then
	        ' let IIS figure out this one for itself
                bValidHeader = false
            end if
            if lhName = "date" then
	        ' ditto
                bValidHeader = false
            end if
    
            if bValidHeader then
    	        Response.addheader hName, hValue
            end if
        end if
    next
End Sub

Sub debugShowServerVariables
    ' print all variables in ServerVariables. Useful for writing or
    ' debugging this script
    Dim strKey
    Dim line
    For Each strKey In Request.ServerVariables
        Response.Write("<h5>" & strKey & "</h5><ul>")
        For Each line In split(Request.ServerVariables(strKey), vbnewline)
            Response.Write("<li>[" & line & "]</li>")
        Next
        Response.Write("</ul>")
    Next
End Sub

Function getStatusLine(fbtServer)
    ' assemble the HTTP status line from the response,
    ' something like "200 OK" or "404 Not Found"
    getStatusLine = fbtServer.status & " " & fbtServer.statusText
End Function

Sub debugShowZopeResponse(fbtServer)
    Response.Write("<h5>Status: " & getStatusLine(fbtServer) & "</h5><ul>")
    for each hLine in split(fbtServer.getAllResponseHeaders(), vbnewline)
        if trim(hLine) <> "" then
            Response.Write("<li>[" & hLine & "]</li>")
        end if
    next
    Response.Write("</ul>")
End Sub

Response.buffer=true

' *** The magic begins ***
' show all server variables
' debugShowServerVariables
' Response.end

' First let's gather some info from our environment
Dim reqInfo
set reqInfo = new RequestInfo

' Ok, let's put together the request that goes to the  server

' the Virtual Host Monster url
Dim vhmURL
vhmURL = fbtAddress

' This should look like the ProxyPass or RewriteRule URL in an Apache+VHM configuration
'Response.Write("<h2>" & vhmURL & "</h2>")

Dim browserRequest
browserRequest = reqInfo.url

Dim fbtRequest
fbtRequest = vhmURL & browserRequest

'Response.Write("<h2>" & fbtRequest & "</h2>")

' Now that we know who to call, lets pick up the phone

' WinHTTPRequest options:
Const WinHttpRequestOption_UserAgentString = 0
Const WinHttpRequestOption_URL = 1
Const WinHttpRequestOption_URLCodePage = 2
Const WinHttpRequestOption_EscapePercentInURL = 3
Const WinHttpRequestOption_SslErrorIgnoreFlags = 4
Const WinHttpRequestOption_SelectCertificate = 5
Const WinHttpRequestOption_EnableRedirects = 6
Const WinHttpRequestOption_UrlEscapeDisable = 7
Const WinHttpRequestOption_UrlEscapeDisableQuery = 8
Const WinHttpRequestOption_SecureProtocols = 9
Const WinHttpRequestOption_EnableTracing = 10

Dim fbtServer
Set fbtServer = Server.CreateObject(WinHTTPProgID) ' WinHTTPRequest object

'we don't want it following redirects for us
'we want the browser to follow redirects for itself
fbtServer.Option(WinHttpRequestOption_EnableRedirects) = False

fbtServer.Open Request.ServerVariables("REQUEST_METHOD"), fbtRequest, False

' Send any pertinent request headers
copyHeadersFromBrowser fbtServer

' Pass the POST data, in case it exists
Dim binaryData
binaryData = Request.binaryRead(Request.totalBytes)
fbtServer.send(binaryData)

' uncomment this to see Zope response headers
'debugShowZopeResponse fbtServer

' get the status line
Response.Status = getStatusLine(fbtServer)

' and all other response headers except a few unwanted ones
copyHeadersToBrowser fbtServer

' Finally, we send the body, unless we're in a redirect
If not (fbtServer.Status >= 300 and fbtServer.Status < 400) Then
     Response.BinaryWrite(fbtServer.responseBody)
end if

Response.end
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