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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 http.n man page for documentation
package provide http 1.0
array set http {
-accept */*
-proxyhost {}
-proxyport {}
-useragent {Tcl http client package 1.0}
-proxyfilter httpProxyRequired
}
proc http_config {args} {
global 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 httpFinish { token {errormsg ""} } {
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
}
}
unset state(-command)
}
}
proc http_reset { token {why reset} } {
upvar #0 $token state
set state(status) $why
catch {fileevent $state(sock) readable {}}
httpFinish $token
if {[info exists state(error)]} {
set errorlist $state(error)
unset state(error)
eval error $errorlist
}
}
proc http_get { url args } {
global http
if {![info exists http(uid)]} {
set http(uid) 0
}
set token http#[incr http(uid)]
upvar #0 $token state
http_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 -nonewline $s $state(-query)
} else {
puts $s ""
}
flush $s
fileevent $s readable [list httpEvent $token]
if {! [info exists state(-command)]} {
http_wait $token
}
return $token
}
proc http_data {token} {
upvar #0 $token state
return $state(body)
}
proc http_status {token} {
upvar #0 $token state
return $state(status)
}
proc http_code {token} {
upvar #0 $token state
return $state(http)
}
proc http_size {token} {
upvar #0 $token state
return $state(currentsize)
}
proc httpEvent {token} {
upvar #0 $token state
set s $state(sock)
if {[eof $s]} {
httpEof $token
return
}
if {$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 {}
httpCopyStart $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]} {
httpFinish $token $err
} else {
if {[info exists state(-progress)]} {
eval $state(-progress) {$token $state(totalsize) $state(currentsize)}
}
}
}
}
proc httpCopyStart {s token} {
upvar #0 $token state
if {[catch {
fcopy $s $state(-channel) -size $state(-blocksize) -command \
[list httpCopyDone $token]
} err]} {
httpFinish $token $err
}
}
proc httpCopyDone {token count {error {}}} {
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)}
}
if {([string length $error] != 0)} {
httpFinish $token $error
} elseif {[eof $s]} {
httpEof $token
} else {
httpCopyStart $s $token
}
}
proc httpEof {token} {
upvar #0 $token state
if {$state(state) == "header"} {
# Premature eof
set state(status) eof
} else {
set state(status) ok
}
set state(state) eof
httpFinish $token
}
proc http_wait {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)
}
# 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.
proc http_formatQuery {args} {
set result ""
set sep ""
foreach i $args {
append result $sep [httpMapReply $i]
if {$sep != "="} {
set sep =
} else {
set sep &
}
}
return $result
}
# do x-www-urlencoded character mapping
# The spec says: "non-alphanumeric characters are replaced by '%HH'"
# 1 leave alphanumerics characters alone
# 2 Convert every other character to an array lookup
# 3 Escape constructs that are "special" to the tcl parser
# 4 "subst" the result, doing all the array substitutions
proc httpMapReply {string} {
global httpFormMap
set alphanumeric a-zA-Z0-9
if {![info exists httpFormMap]} {
for {set i 1} {$i <= 256} {incr i} {
set c [format %c $i]
if {![string match \[$alphanumeric\] $c]} {
set httpFormMap($c) %[format %.2x $i]
}
}
# These are handled specially
array set httpFormMap {
" " + \n %0d%0a
}
}
regsub -all \[^$alphanumeric\] $string {$httpFormMap(&)} string
regsub -all \n $string {\\n} string
regsub -all \t $string {\\t} string
regsub -all {[][{})\\]\)} $string {\\&} string
return [subst $string]
}
# Default proxy filter.
proc httpProxyRequired {host} {
global 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 {}
}
}