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				# http.tcl --				#				#	Client-side HTTP for GET, POST, and HEAD commands.				#	These routines can be used in untrusted code that uses 				#	the Safesock security policy.  These procedures use a 				#	callback interface to avoid using vwait, which is not 				#	defined in the safe base.				#				# See the file "license.terms" for information on usage and				# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.				#				# RCS: @(#) $Id: http.tcl,v 1.5 1999/02/02 22:28:30 stanton Exp $								package provide http 2.0	;# This uses Tcl namespaces								namespace eval http {				    variable http								    array set http {					-accept */*					-proxyhost {}					-proxyport {}					-useragent {Tcl http client package 2.0}					-proxyfilter http::ProxyRequired				    }								    variable formMap				    set alphanumeric	a-zA-Z0-9								    for {set i 1} {$i 					set c [format %c $i]					if {![string match \[$alphanumeric\] $c]} {					    set formMap($c) %[format %.2x $i]					}				    }				    # These are handled specially				    array set formMap {					" " +   \n %0d%0a				    }								    namespace export geturl config reset wait formatQuery 				    # Useful, but not exported: data size status code				}								# http::config --				#				#	See documentaion for details.				#				# Arguments:				#	args		Options parsed by the procedure.				# Results:				#        TODO								proc http::config {args} {				    variable http				    set options [lsort [array names http -*]]				    set usage [join $options ", "]				    if {[llength $args] == 0} {					set result {}					foreach name $options {					    lappend result $name $http($name)					}					return $result				    }				    regsub -all -- - $options {} options				    set pat ^-([join $options |])$				    if {[llength $args] == 1} {					set flag [lindex $args 0]					if {[regexp -- $pat $flag]} {					    return $http($flag)					} else {					    return -code error "Unknown option $flag, must be: $usage"					}				    } else {					foreach {flag value} $args {					    if {[regexp -- $pat $flag]} {						set http($flag) $value					    } else {						return -code error "Unknown option $flag, must be: $usage"					    }					}				    }				}								 proc http::Finish { token {errormsg ""} } {				    variable $token				    upvar 0 $token state				    global errorInfo errorCode				    if {[string length $errormsg] != 0} {					set state(error) [list $errormsg $errorInfo $errorCode]					set state(status) error				    }				    catch {close $state(sock)}				    catch {after cancel $state(after)}				    if {[info exists state(-command)]} {					if {[catch {eval $state(-command) {$token}} err]} {					    if {[string length $errormsg] == 0} {						set state(error) [list $err $errorInfo $errorCode]						set state(status) error					    }					}					if {[info exist state(-command)]} {					    # Command callback may already have unset our state					    unset state(-command)					}				    }				}								# http::reset --				#				#	See documentaion for details.				#				# Arguments:				#	token	Connection token.				#	why	Status info.				# Results:				#        TODO								proc http::reset { token {why reset} } {				    variable $token				    upvar 0 $token state				    set state(status) $why				    catch {fileevent $state(sock) readable {}}				    Finish $token				    if {[info exists state(error)]} {					set errorlist $state(error)					unset state(error)					eval error $errorlist				    }				}								# http::geturl --				#				#	Establishes a connection to a remote url via http.				#				# Arguments:				#        url		The http URL to goget.				#        args		Option value pairs. Valid options include:				#				-blocksize, -validate, -headers, -timeout				# Results:				#        Returns a token for this connection.												proc http::geturl { url args } {				    variable http				    if {![info exists http(uid)]} {					set http(uid) 0				    }				    set token [namespace current]::[incr http(uid)]				    variable $token				    upvar 0 $token state				    reset $token				    array set state {					-blocksize 	8192					-validate 	0					-headers 	{}					-timeout 	0					state		header					meta		{}					currentsize	0					totalsize	0				        type            text/html				        body            {}					status		""				    }				    set options {-blocksize -channel -command -handler -headers \						-progress -query -validate -timeout}				    set usage [join $options ", "]				    regsub -all -- - $options {} options				    set pat ^-([join $options |])$				    foreach {flag value} $args {					if {[regexp $pat $flag]} {					    # Validate numbers					    if {[info exists state($flag)] && \						    [regexp {^[0-9]+$} $state($flag)] && \						    ![regexp {^[0-9]+$} $value]} {						return -code error "Bad value for $flag ($value), must be integer"					    }					    set state($flag) $value					} else {					    return -code error "Unknown option $flag, can be: $usage"					}				    }				    if {! [regexp -nocase {^(http://)?([^/:]+)(:([0-9]+))?(/.*)?$} $url \					    x proto host y port srvurl]} {					error "Unsupported URL: $url"				    }				    if {[string length $port] == 0} {					set port 80				    }				    if {[string length $srvurl] == 0} {					set srvurl /				    }				    if {[string length $proto] == 0} {					set url http://$url				    }				    set state(url) $url				    if {![catch {$http(-proxyfilter) $host} proxy]} {					set phost [lindex $proxy 0]					set pport [lindex $proxy 1]				    }				    if {$state(-timeout) > 0} {					set state(after) [after $state(-timeout) [list http::reset $token timeout]]				    }				    if {[info exists phost] && [string length $phost]} {					set srvurl $url					set s [socket $phost $pport]				    } else {					set s [socket $host $port]				    }				    set state(sock) $s								    # Send data in cr-lf format, but accept any line terminators								    fconfigure $s -translation {auto crlf} -buffersize $state(-blocksize)								    # The following is disallowed in safe interpreters, but the socket				    # is already in non-blocking mode in that case.								    catch {fconfigure $s -blocking off}				    set len 0				    set how GET				    if {[info exists state(-query)]} {					set len [string length $state(-query)]					if {$len > 0} {					    set how POST					}				    } elseif {$state(-validate)} {					set how HEAD				    }				    puts $s "$how $srvurl HTTP/1.0"				    puts $s "Accept: $http(-accept)"				    puts $s "Host: $host"				    puts $s "User-Agent: $http(-useragent)"				    foreach {key value} $state(-headers) {					regsub -all \[\n\r\]  $value {} value					set key [string trim $key]					if {[string length $key]} {					    puts $s "$key: $value"					}				    }				    if {$len > 0} {					puts $s "Content-Length: $len"					puts $s "Content-Type: application/x-www-form-urlencoded"					puts $s ""					fconfigure $s -translation {auto binary}					puts $s $state(-query)				    } else {					puts $s ""				    }				    flush $s				    fileevent $s readable [list http::Event $token]				    if {! [info exists state(-command)]} {					wait $token				    }				    return $token				}								# Data access functions:				# Data - the URL data				# Status - the transaction status: ok, reset, eof, timeout				# Code - the HTTP transaction code, e.g., 200				# Size - the size of the URL data								proc http::data {token} {				    variable $token				    upvar 0 $token state				    return $state(body)				}				proc http::status {token} {				    variable $token				    upvar 0 $token state				    return $state(status)				}				proc http::code {token} {				    variable $token				    upvar 0 $token state				    return $state(http)				}				proc http::size {token} {				    variable $token				    upvar 0 $token state				    return $state(currentsize)				}								 proc http::Event {token} {				    variable $token				    upvar 0 $token state				    set s $state(sock)								     if {[::eof $s]} {					Eof $token					return				    }				    if {$state(state) == "header"} {					set n [gets $s line]					if {$n == 0} {					    set state(state) body					    if {![regexp -nocase ^text $state(type)]} {						# Turn off conversions for non-text data						fconfigure $s -translation binary						if {[info exists state(-channel)]} {						    fconfigure $state(-channel) -translation binary						}					    }					    if {[info exists state(-channel)] &&						    ![info exists state(-handler)]} {						# Initiate a sequence of background fcopies						fileevent $s readable {}						CopyStart $s $token					    }					} elseif {$n > 0} {					    if {[regexp -nocase {^content-type:(.+)$} $line x type]} {						set state(type) [string trim $type]					    }					    if {[regexp -nocase {^content-length:(.+)$} $line x length]} {						set state(totalsize) [string trim $length]					    }					    if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} {						lappend state(meta) $key $value					    } elseif {[regexp ^HTTP $line]} {						set state(http) $line					    }					}				    } else {					if {[catch {					    if {[info exists state(-handler)]} {						set n [eval $state(-handler) {$s $token}]					    } else {						set block [read $s $state(-blocksize)]						set n [string length $block]						if {$n >= 0} {						    append state(body) $block						}					    }					    if {$n >= 0} {						incr state(currentsize) $n					    }					} err]} {					    Finish $token $err					} else {					    if {[info exists state(-progress)]} {						eval $state(-progress) {$token $state(totalsize) $state(currentsize)}					    }					}				    }				}				 proc http::CopyStart {s token} {				    variable $token				    upvar 0 $token state				    if {[catch {					fcopy $s $state(-channel) -size $state(-blocksize) -command \					    [list http::CopyDone $token]				    } err]} {					Finish $token $err				    }				}				 proc http::CopyDone {token count {error {}}} {				    variable $token				    upvar 0 $token state				    set s $state(sock)				    incr state(currentsize) $count				    if {[info exists state(-progress)]} {					eval $state(-progress) {$token $state(totalsize) $state(currentsize)}				    }				    # At this point the token may have been reset				    if {([string length $error] != 0)} {					Finish $token $error				    } elseif {[catch {::eof $s} iseof] || $iseof} {					Eof $token				    } else {					CopyStart $s $token				    }				}				 proc http::Eof {token} {				    variable $token				    upvar 0 $token state				    if {$state(state) == "header"} {					# Premature eof					set state(status) eof				    } else {					set state(status) ok				    }				    set state(state) eof				    Finish $token				}								# http::wait --				#				#	See documentaion for details.				#				# Arguments:				#	token	Connection token.				# Results:				#        The status after the wait.								proc http::wait {token} {				    variable $token				    upvar 0 $token state								    if {![info exists state(status)] || [string length $state(status)] == 0} {					vwait $token\(status)				    }				    if {[info exists state(error)]} {					set errorlist $state(error)					unset state(error)					eval error $errorlist				    }				    return $state(status)				}								# http::formatQuery --				#				#	See documentaion for details.				#	Call http::formatQuery with an even number of arguments, where 				#	the first is a name, the second is a value, the third is another 				#	name, and so on.				#				# Arguments:				#	args	A list of name-value pairs.				# Results:				#        TODO								proc http::formatQuery {args} {				    set result ""				    set sep ""				    foreach i $args {					append result  $sep [mapReply $i]					if {$sep != "="} {					    set sep =					} else {					    set sep &					}				    }				    return $result				}								# do x-www-urlencoded character mapping				# The spec says: "non-alphanumeric characters are replaced by '%HH'"				# 1 leave alphanumerics characters alone				# 2 Convert every other character to an array lookup				# 3 Escape constructs that are "special" to the tcl parser				# 4 "subst" the result, doing all the array substitutions				 				 proc http::mapReply {string} {				    variable formMap				    set alphanumeric	a-zA-Z0-9				    regsub -all \[^$alphanumeric\] $string {$formMap(&)} string				    regsub -all \n $string {\\n} string				    regsub -all \t $string {\\t} string				    regsub -all {[][{})\\]\)} $string {\\&} string				    return [subst $string]				}								# Default proxy filter. 				 proc http::ProxyRequired {host} {				    variable http				    if {[info exists http(-proxyhost)] && [string length $http(-proxyhost)]} {					if {![info exists http(-proxyport)] || ![string length $http(-proxyport)]} {					    set http(-proxyport) 8080					}					return [list $http(-proxyhost) $http(-proxyport)]				    } else {					return {}				    }				}