#

# The httpd_ procedures implement a stub http server.

#

# Copyright (c) 1997-1998 Sun Microsystems, Inc.

# Copyright (c) 1999-2000 Scriptics Corporation

#

# See the file "license.terms" for information on usage and redistribution

# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

#

# SCCS: @(#) httpd 1.2 98/02/20 14:51:59

#set httpLog 1

proc httpd_init {{port 8015}} {

    socket -server httpdAccept $port

}

proc httpd_log {args} {

    global httpLog

    if {[info exists httpLog] && $httpLog} {

	puts stderr "httpd: [join $args { }]"

    }

}

array set httpdErrors {

    204 {No Content}

    400 {Bad Request}

    401 {Authorization Required}

    404 {Not Found}

    503 {Service Unavailable}

    504 {Service Temporarily Unavailable}

    }

proc httpdError {sock code args} {

    global httpdErrors

    puts $sock "$code $httpdErrors($code)"

    httpd_log "error: [join $args { }]"

}

proc httpdAccept {newsock ipaddr port} {

    global httpd

    upvar #0 httpd$newsock data

    fconfigure $newsock -blocking 0 -translation {auto crlf}

    httpd_log $newsock Connect $ipaddr $port

    set data(ipaddr) $ipaddr

    fileevent $newsock readable [list httpdRead $newsock]

}

# read data from a client request

proc httpdRead { sock } {

    upvar #0 httpd$sock data

    if {[eof $sock]} {

	set readCount -1

    } elseif {![info exists data(state)]} {

	# Read the protocol line and parse out the URL and query

	set readCount [gets $sock line]

	if [regexp {(POST|GET|HEAD) ([^?]+)\??([^ ]*) HTTP/(1.[01])} \

		$line x data(proto) data(url) data(query) data(httpversion)] {

	    set data(state) mime

	    httpd_log $sock Query $line

	} else {

	    httpdError $sock 400

	    httpd_log $sock Error "bad first line:$line"

	    httpdSockDone $sock

	}

	return

    } elseif {$data(state) == "mime"} {

	# Read the HTTP headers

	set readCount [gets $sock line]

    } elseif {$data(state) == "query"} {

	# Read the query data

	if {![info exists data(length_orig)]} {

	    set data(length_orig) $data(length)

	}

	set line [read $sock $data(length)]

	set readCount [string length $line]

	incr data(length) -$readCount

    }

    # string compare $readCount 0 maps -1 to -1, 0 to 0, and > 0 to 1

    set state [string compare $readCount 0],$data(state),$data(proto)

    httpd_log $sock $state

    switch -- $state {

	-1,mime,HEAD	-

	-1,mime,GET	-

	-1,mime,POST	{

	    # gets would block

	    return

	}

	0,mime,HEAD	-

	0,mime,GET	-

	0,query,POST	{ 

	    # Empty line at end of headers,

	    # or eof after query data

	    httpdRespond $sock

	}

	0,mime,POST	{

	    # Empty line between headers and query data

	    if {![info exists data(mime,content-length)]} {

		httpd_log $sock Error "No Content-Length for POST"

		httpdError $sock 400

		httpdSockDone $sock

	    } else {

		set data(state) query

		set data(length) $data(mime,content-length)

		# Special case to simulate servers that respond

		# without reading the post data.

		if {[string match *droppost* $data(url)]} {

		    fileevent $sock readable {}

		    httpdRespond $sock

		}

	    }

	}

	1,mime,HEAD	-

	1,mime,POST	-

	1,mime,GET	{

	    # A line of HTTP headers

	    if {[regexp {([^:]+):[ 	]*(.*)}  $line dummy key value]} {

		set data(mime,[string tolower $key]) $value

	    }

	}

	-1,query,POST	{

	    httpd_log $sock Error "unexpected eof on <$data(url)> request"

	    httpdError $sock 400

	    httpdSockDone $sock

	}

	1,query,POST	{

	    append data(query) $line

	    if {$data(length) <= 0} {

		set data(length) $data(length_orig)

		httpdRespond $sock

	    }

	}

	default {

	    if {[eof $sock]} {

		httpd_log $sock Error "unexpected eof on <$data(url)> request"

	    } else {

		httpd_log $sock Error "unhandled state <$state> fetching <$data(url)>"

	    }

	    httpdError $sock 404

	    httpdSockDone $sock

	}

    }

}

proc httpdSockDone { sock } {

    upvar #0 httpd$sock data

    unset data

    catch {close $sock}

}

# Respond to the query.

proc httpdRespond { sock } {

    global httpd bindata port

    upvar #0 httpd$sock data

    switch -glob -- $data(url) {

	*binary* {

	    set html "$bindata[info hostname]:$port$data(url)"

	    set type application/octet-stream

	}

	*post* {

	    set html "Got [string length $data(query)] bytes"

	    set type text/plain

	}

	default {

	    set type text/html

	    set html "<html><head><title>HTTP/1.0 TEST</title></head><body>

<h1>Hello, World!</h1>

<h2>$data(proto) $data(url)</h2>

"

	    if {[info exists data(query)] && [string length $data(query)]} {

		append html "<h2>Query</h2>\n<dl>\n"

		foreach {key value} [split $data(query) &=] {

		    append html "<dt>$key<dd>$value\n"

		    if {$key == "timeout"} {

			after $value	;# pause

		    }

		}

		append html </dl>\n

	    }

	    append html </body></html>

	}

    }

    # Catch errors from premature client closes

    catch {

	if {$data(proto) == "HEAD"} {

	    puts $sock "HTTP/1.0 200 OK"

	} else {

	    puts $sock "HTTP/1.0 200 Data follows"

	}

	puts $sock "Date: [clock format [clock clicks]]"

	puts $sock "Content-Type: $type"

	puts $sock "Content-Length: [string length $html]"

	puts $sock ""

	flush $sock

	if {$data(proto) != "HEAD"} {

	    fconfigure $sock -translation binary

	    puts -nonewline $sock $html

	}

    }

    httpd_log $sock Done ""

    httpdSockDone $sock

}