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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.
package require Tcl 8.6-
# Keep this in sync with pkgIndex.tcl and with the install directories in
# Makefiles
package provide http 2.8.12
namespace eval http {
# Allow resourcing to not clobber existing data
variable http
if {![info exists http]} {
array set http {
-accept */*
-proxyhost {}
-proxyport {}
-proxyfilter http::ProxyRequired
-urlencoding utf-8
}
# We need a useragent string of this style or various servers will refuse to
# send us compressed content even when we ask for it. This follows the
# de-facto layout of user-agent strings in current browsers.
# Safe interpreters do not have ::tcl_platform(os) or
# ::tcl_platform(osVersion).
if {[interp issafe]} {
set http(-useragent) "Mozilla/5.0\
(Windows; U;\
Windows NT 10.0)\
http/[package provide http] Tcl/[package provide Tcl]"
} else {
set http(-useragent) "Mozilla/5.0\
([string totitle $::tcl_platform(platform)]; U;\
$::tcl_platform(os) $::tcl_platform(osVersion))\
http/[package provide http] Tcl/[package provide Tcl]"
}
}
proc init {} {
# Set up the map for quoting chars. RFC3986 Section 2.3 say percent
# encode all except: "... percent-encoded octets in the ranges of
# ALPHA (%41-%5A and %61-%7A), DIGIT (%30-%39), hyphen (%2D), period
# (%2E), underscore (%5F), or tilde (%7E) should not be created by URI
# producers ..."
for {set i 0} {$i <= 256} {incr i} {
set c [format %c $i]
if {![string match {[-._~a-zA-Z0-9]} $c]} {
set map($c) %[format %.2X $i]
}
}
# These are handled specially
set map(\n) %0D%0A
variable formMap [array get map]
# Create a map for HTTP/1.1 open sockets
variable socketmap
if {[info exists socketmap]} {
# Close but don't remove open sockets on re-init
foreach {url sock} [array get socketmap] {
catch {close $sock}
}
}
array set socketmap {}
}
init
variable urlTypes
if {![info exists urlTypes]} {
set urlTypes(http) [list 80 ::socket]
}
variable encodings [string tolower [encoding names]]
# This can be changed, but iso8859-1 is the RFC standard.
variable defaultCharset
if {![info exists defaultCharset]} {
set defaultCharset "iso8859-1"
}
# Force RFC 3986 strictness in geturl url verification?
variable strict
if {![info exists strict]} {
set strict 1
}
# Let user control default keepalive for compatibility
variable defaultKeepalive
if {![info exists defaultKeepalive]} {
set defaultKeepalive 0
}
namespace export geturl config reset wait formatQuery register unregister
# Useful, but not exported: data size status code
}
# http::Log --
#
# Debugging output -- define this to observe HTTP/1.1 socket usage.
# Should echo any args received.
#
# Arguments:
# msg Message to output
#
if {[info command http::Log] eq {}} {proc http::Log {args} {}}
# http::register --
#
# See documentation for details.
#
# Arguments:
# proto URL protocol prefix, e.g. https
# port Default port for protocol
# command Command to use to create socket
# Results:
# list of port and command that was registered.
proc http::register {proto port command} {
variable urlTypes
set urlTypes([string tolower $proto]) [list $port $command]
}
# http::unregister --
#
# Unregisters URL protocol handler
#
# Arguments:
# proto URL protocol prefix, e.g. https
# Results:
# list of port and command that was unregistered.
proc http::unregister {proto} {
variable urlTypes
set lower [string tolower $proto]
if {![info exists urlTypes($lower)]} {
return -code error "unsupported url type \"$proto\""
}
set old $urlTypes($lower)
unset urlTypes($lower)
return $old
}
# http::config --
#
# See documentation 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
}
set options [string map {- ""} $options]
set pat ^-(?:[join $options |])$
if {[llength $args] == 1} {
set flag [lindex $args 0]
if {![regexp -- $pat $flag]} {
return -code error "Unknown option $flag, must be: $usage"
}
return $http($flag)
} else {
foreach {flag value} $args {
if {![regexp -- $pat $flag]} {
return -code error "Unknown option $flag, must be: $usage"
}
set http($flag) $value
}
}
}
# http::Finish --
#
# Clean up the socket and eval close time callbacks
#
# Arguments:
# token Connection token.
# errormsg (optional) If set, forces status to error.
# skipCB (optional) If set, don't call the -command callback. This
# is useful when geturl wants to throw an exception instead
# of calling the callback. That way, the same error isn't
# reported to two places.
#
# Side Effects:
# Closes the socket
proc http::Finish {token {errormsg ""} {skipCB 0}} {
variable $token
upvar 0 $token state
global errorInfo errorCode
if {$errormsg ne ""} {
set state(error) [list $errormsg $errorInfo $errorCode]
set state(status) "error"
}
if { ($state(status) eq "timeout")
|| ($state(status) eq "error")
|| ([info exists state(-keepalive)] && !$state(-keepalive))
|| ([info exists state(connection)] && ($state(connection) eq "close"))
} {
CloseSocket $state(sock) $token
}
if {[info exists state(after)]} {
after cancel $state(after)
}
if {[info exists state(-command)] && !$skipCB
&& ![info exists state(done-command-cb)]} {
set state(done-command-cb) yes
if {[catch {eval $state(-command) {$token}} err] && $errormsg eq ""} {
set state(error) [list $err $errorInfo $errorCode]
set state(status) error
}
}
}
# http::CloseSocket -
#
# Close a socket and remove it from the persistent sockets table. If
# possible an http token is included here but when we are called from a
# fileevent on remote closure we need to find the correct entry - hence
# the second section.
proc ::http::CloseSocket {s {token {}}} {
variable socketmap
catch {fileevent $s readable {}}
set conn_id {}
if {$token ne ""} {
variable $token
upvar 0 $token state
if {[info exists state(socketinfo)]} {
set conn_id $state(socketinfo)
}
} else {
set map [array get socketmap]
set ndx [lsearch -exact $map $s]
if {$ndx != -1} {
incr ndx -1
set conn_id [lindex $map $ndx]
}
}
if {$conn_id eq {} || ![info exists socketmap($conn_id)]} {
Log "Closing socket $s (no connection info)"
if {[catch {close $s} err]} {
Log "Error: $err"
}
} else {
if {[info exists socketmap($conn_id)]} {
Log "Closing connection $conn_id (sock $socketmap($conn_id))"
if {[catch {close $socketmap($conn_id)} err]} {
Log "Error: $err"
}
unset socketmap($conn_id)
} else {
Log "Cannot close connection $conn_id - no socket in socket map"
}
}
}
# http::reset --
#
# See documentation for details.
#
# Arguments:
# token Connection token.
# why Status info.
#
# Side Effects:
# See Finish
proc http::reset {token {why reset}} {
variable $token
upvar 0 $token state
set state(status) $why
catch {fileevent $state(sock) readable {}}
catch {fileevent $state(sock) writable {}}
Finish $token
if {[info exists state(error)]} {
set errorlist $state(error)
unset state
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. This token is the name of an
# array that the caller should unset to garbage collect the state.
proc http::geturl {url args} {
variable http
variable urlTypes
variable defaultCharset
variable defaultKeepalive
variable strict
# Initialize the state variable, an array. We'll return the name of this
# array as the token for the transaction.
if {![info exists http(uid)]} {
set http(uid) 0
}
set token [namespace current]::[incr http(uid)]
variable $token
upvar 0 $token state
reset $token
# Process command options.
array set state {
-binary false
-blocksize 8192
-queryblocksize 8192
-validate 0
-headers {}
-timeout 0
-type application/x-www-form-urlencoded
-queryprogress {}
-protocol 1.1
binary 0
state connecting
meta {}
coding {}
currentsize 0
totalsize 0
querylength 0
queryoffset 0
type text/html
body {}
status ""
http ""
connection close
}
set state(-keepalive) $defaultKeepalive
set state(-strict) $strict
# These flags have their types verified [Bug 811170]
array set type {
-binary boolean
-blocksize integer
-queryblocksize integer
-strict boolean
-timeout integer
-validate boolean
}
set state(charset) $defaultCharset
set options {
-binary -blocksize -channel -command -handler -headers -keepalive
-method -myaddr -progress -protocol -query -queryblocksize
-querychannel -queryprogress -strict -timeout -type -validate
}
set usage [join [lsort $options] ", "]
set options [string map {- ""} $options]
set pat ^-(?:[join $options |])$
foreach {flag value} $args {
if {[regexp -- $pat $flag]} {
# Validate numbers
if {
[info exists type($flag)] &&
![string is $type($flag) -strict $value]
} {
unset $token
return -code error \
"Bad value for $flag ($value), must be $type($flag)"
}
set state($flag) $value
} else {
unset $token
return -code error "Unknown option $flag, can be: $usage"
}
}
# Make sure -query and -querychannel aren't both specified
set isQueryChannel [info exists state(-querychannel)]
set isQuery [info exists state(-query)]
if {$isQuery && $isQueryChannel} {
unset $token
return -code error "Can't combine -query and -querychannel options!"
}
# Validate URL, determine the server host and port, and check proxy case
# Recognize user:pass@host URLs also, although we do not do anything with
# that info yet.
# URLs have basically four parts.
# First, before the colon, is the protocol scheme (e.g. http)
# Second, for HTTP-like protocols, is the authority
# The authority is preceded by // and lasts up to (but not including)
# the following / or ? and it identifies up to four parts, of which
# only one, the host, is required (if an authority is present at all).
# All other parts of the authority (user name, password, port number)
# are optional.
# Third is the resource name, which is split into two parts at a ?
# The first part (from the single "/" up to "?") is the path, and the
# second part (from that "?" up to "#") is the query. *HOWEVER*, we do
# not need to separate them; we send the whole lot to the server.
# Both, path and query are allowed to be missing, including their
# delimiting character.
# Fourth is the fragment identifier, which is everything after the first
# "#" in the URL. The fragment identifier MUST NOT be sent to the server
# and indeed, we don't bother to validate it (it could be an error to
# pass it in here, but it's cheap to strip).
#
# An example of a URL that has all the parts:
#
# http://jschmoe:xyzzy@www.bogus.net:8000/foo/bar.tml?q=foo#changes
#
# The "http" is the protocol, the user is "jschmoe", the password is
# "xyzzy", the host is "www.bogus.net", the port is "8000", the path is
# "/foo/bar.tml", the query is "q=foo", and the fragment is "changes".
#
# Note that the RE actually combines the user and password parts, as
# recommended in RFC 3986. Indeed, that RFC states that putting passwords
# in URLs is a Really Bad Idea, something with which I would agree utterly.
#
# From a validation perspective, we need to ensure that the parts of the
# URL that are going to the server are correctly encoded. This is only
# done if $state(-strict) is true (inherited from $::http::strict).
set URLmatcher {(?x) # this is _expanded_ syntax
^
(?: (\w+) : ) ? # <protocol scheme>
(?: //
(?:
(
[^@/\#?]+ # <userinfo part of authority>
) @
)?
( # <host part of authority>
[^/:\#?]+ | # host name or IPv4 address
\[ [^/\#?]+ \] # IPv6 address in square brackets
)
(?: : (\d+) )? # <port part of authority>
)?
( [/\?] [^\#]*)? # <path> (including query)
(?: \# (.*) )? # <fragment>
$
}
# Phase one: parse
if {![regexp -- $URLmatcher $url -> proto user host port srvurl]} {
unset $token
return -code error "Unsupported URL: $url"
}
# Phase two: validate
set host [string trim $host {[]}]; # strip square brackets from IPv6 address
if {$host eq ""} {
# Caller has to provide a host name; we do not have a "default host"
# that would enable us to handle relative URLs.
unset $token
return -code error "Missing host part: $url"
# Note that we don't check the hostname for validity here; if it's
# invalid, we'll simply fail to resolve it later on.
}
if {$port ne "" && $port > 65535} {
unset $token
return -code error "Invalid port number: $port"
}
# The user identification and resource identification parts of the URL can
# have encoded characters in them; take care!
if {$user ne ""} {
# Check for validity according to RFC 3986, Appendix A
set validityRE {(?xi)
^
(?: [-\w.~!$&'()*+,;=:] | %[0-9a-f][0-9a-f] )+
$
}
if {$state(-strict) && ![regexp -- $validityRE $user]} {
unset $token
# Provide a better error message in this error case
if {[regexp {(?i)%(?![0-9a-f][0-9a-f]).?.?} $user bad]} {
return -code error \
"Illegal encoding character usage \"$bad\" in URL user"
}
return -code error "Illegal characters in URL user"
}
}
if {$srvurl ne ""} {
# RFC 3986 allows empty paths (not even a /), but servers
# return 400 if the path in the HTTP request doesn't start
# with / , so add it here if needed.
if {[string index $srvurl 0] ne "/"} {
set srvurl /$srvurl
}
# Check for validity according to RFC 3986, Appendix A
set validityRE {(?xi)
^
# Path part (already must start with / character)
(?: [-\w.~!$&'()*+,;=:@/] | %[0-9a-f][0-9a-f] )*
# Query part (optional, permits ? characters)
(?: \? (?: [-\w.~!$&'()*+,;=:@/?] | %[0-9a-f][0-9a-f] )* )?
$
}
if {$state(-strict) && ![regexp -- $validityRE $srvurl]} {
unset $token
# Provide a better error message in this error case
if {[regexp {(?i)%(?![0-9a-f][0-9a-f])..} $srvurl bad]} {
return -code error \
"Illegal encoding character usage \"$bad\" in URL path"
}
return -code error "Illegal characters in URL path"
}
} else {
set srvurl /
}
if {$proto eq ""} {
set proto http
}
set lower [string tolower $proto]
if {![info exists urlTypes($lower)]} {
unset $token
return -code error "Unsupported URL type \"$proto\""
}
set defport [lindex $urlTypes($lower) 0]
set defcmd [lindex $urlTypes($lower) 1]
if {$port eq ""} {
set port $defport
}
if {![catch {$http(-proxyfilter) $host} proxy]} {
set phost [lindex $proxy 0]
set pport [lindex $proxy 1]
}
# OK, now reassemble into a full URL
set url ${proto}://
if {$user ne ""} {
append url $user
append url @
}
append url $host
if {$port != $defport} {
append url : $port
}
append url $srvurl
# Don't append the fragment!
set state(url) $url
# If a timeout is specified we set up the after event and arrange for an
# asynchronous socket connection.
set sockopts [list -async]
if {$state(-timeout) > 0} {
set state(after) [after $state(-timeout) \
[list http::reset $token timeout]]
}
# If we are using the proxy, we must pass in the full URL that includes
# the server name.
if {[info exists phost] && ($phost ne "")} {
set srvurl $url
set targetAddr [list $phost $pport]
} else {
set targetAddr [list $host $port]
}
# Proxy connections aren't shared among different hosts.
set state(socketinfo) $host:$port
# Save the accept types at this point to prevent a race condition. [Bug
# c11a51c482]
set state(accept-types) $http(-accept)
# See if we are supposed to use a previously opened channel.
if {$state(-keepalive)} {
variable socketmap
if {[info exists socketmap($state(socketinfo))]} {
if {[catch {fconfigure $socketmap($state(socketinfo))}]} {
Log "WARNING: socket for $state(socketinfo) was closed"
unset socketmap($state(socketinfo))
} else {
set sock $socketmap($state(socketinfo))
Log "reusing socket $sock for $state(socketinfo)"
catch {fileevent $sock writable {}}
catch {fileevent $sock readable {}}
}
}
# don't automatically close this connection socket
set state(connection) {}
}
if {![info exists sock]} {
# Pass -myaddr directly to the socket command
if {[info exists state(-myaddr)]} {
lappend sockopts -myaddr $state(-myaddr)
}
if {[catch {eval $defcmd $sockopts $targetAddr} sock]} {
# something went wrong while trying to establish the connection.
# Clean up after events and such, but DON'T call the command
# callback (if available) because we're going to throw an
# exception from here instead.
set state(sock) $sock
Finish $token "" 1
cleanup $token
return -code error $sock
}
}
set state(sock) $sock
Log "Using $sock for $state(socketinfo)" \
[expr {$state(-keepalive)?"keepalive":""}]
if {$state(-keepalive)} {
set socketmap($state(socketinfo)) $sock
}
if {![info exists phost]} {
set phost ""
}
fileevent $sock writable [list http::Connect $token $proto $phost $srvurl]
# Wait for the connection to complete.
if {![info exists state(-command)]} {
# geturl does EVERYTHING asynchronously, so if the user
# calls it synchronously, we just do a wait here.
http::wait $token
if {![info exists state]} {
# If we timed out then Finish has been called and the users
# command callback may have cleaned up the token. If so we end up
# here with nothing left to do.
return $token
} elseif {$state(status) eq "error"} {
# Something went wrong while trying to establish the connection.
# Clean up after events and such, but DON'T call the command
# callback (if available) because we're going to throw an
# exception from here instead.
set err [lindex $state(error) 0]
cleanup $token
return -code error $err
}
}
return $token
}
# http::Connected --
#
# Callback used when the connection to the HTTP server is actually
# established.
#
# Arguments:
# token State token.
# proto What protocol (http, https, etc.) was used to connect.
# phost Are we using keep-alive? Non-empty if yes.
# srvurl Service-local URL that we're requesting
# Results:
# None.
proc http::Connected {token proto phost srvurl} {
variable http
variable urlTypes
variable $token
upvar 0 $token state
# Set back the variables needed here
set sock $state(sock)
set isQueryChannel [info exists state(-querychannel)]
set isQuery [info exists state(-query)]
set host [lindex [split $state(socketinfo) :] 0]
set port [lindex [split $state(socketinfo) :] 1]
set lower [string tolower $proto]
set defport [lindex $urlTypes($lower) 0]
# Send data in cr-lf format, but accept any line terminators
fconfigure $sock -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 $sock -blocking off}
set how GET
if {$isQuery} {
set state(querylength) [string length $state(-query)]
if {$state(querylength) > 0} {
set how POST
set contDone 0
} else {
# There's no query data.
unset state(-query)
set isQuery 0
}
} elseif {$state(-validate)} {
set how HEAD
} elseif {$isQueryChannel} {
set how POST
# The query channel must be blocking for the async Write to
# work properly.
fconfigure $state(-querychannel) -blocking 1 -translation binary
set contDone 0
}
if {[info exists state(-method)] && $state(-method) ne ""} {
set how $state(-method)
}
# We cannot handle chunked encodings with -handler, so force HTTP/1.0
# until we can manage this.
if {[info exists state(-handler)]} {
set state(-protocol) 1.0
}
set accept_types_seen 0
if {[catch {
puts $sock "$how $srvurl HTTP/$state(-protocol)"
if {[dict exists $state(-headers) Host]} {
# Allow Host spoofing. [Bug 928154]
puts $sock "Host: [dict get $state(-headers) Host]"
} elseif {$port == $defport} {
# Don't add port in this case, to handle broken servers. [Bug
# #504508]
puts $sock "Host: $host"
} else {
puts $sock "Host: $host:$port"
}
puts $sock "User-Agent: $http(-useragent)"
if {$state(-protocol) == 1.0 && $state(-keepalive)} {
puts $sock "Connection: keep-alive"
}
if {$state(-protocol) > 1.0 && !$state(-keepalive)} {
puts $sock "Connection: close" ;# RFC2616 sec 8.1.2.1
}
if {[info exists phost] && ($phost ne "") && $state(-keepalive)} {
puts $sock "Proxy-Connection: Keep-Alive"
}
set accept_encoding_seen 0
set content_type_seen 0
dict for {key value} $state(-headers) {
set value [string map [list \n "" \r ""] $value]
set key [string map {" " -} [string trim $key]]
if {[string equal -nocase $key "host"]} {
continue
}
if {[string equal -nocase $key "accept-encoding"]} {
set accept_encoding_seen 1
}
if {[string equal -nocase $key "accept"]} {
set accept_types_seen 1
}
if {[string equal -nocase $key "content-type"]} {
set content_type_seen 1
}
if {[string equal -nocase $key "content-length"]} {
set contDone 1
set state(querylength) $value
}
if {[string length $key]} {
puts $sock "$key: $value"
}
}
# Allow overriding the Accept header on a per-connection basis. Useful
# for working with REST services. [Bug c11a51c482]
if {!$accept_types_seen} {
puts $sock "Accept: $state(accept-types)"
}
if {!$accept_encoding_seen && ![info exists state(-handler)]} {
puts $sock "Accept-Encoding: gzip,deflate,compress"
}
if {$isQueryChannel && $state(querylength) == 0} {
# Try to determine size of data in channel. If we cannot seek, the
# surrounding catch will trap us
set start [tell $state(-querychannel)]
seek $state(-querychannel) 0 end
set state(querylength) \
[expr {[tell $state(-querychannel)] - $start}]
seek $state(-querychannel) $start
}
# Flush the request header and set up the fileevent that will either
# push the POST data or read the response.
#
# fileevent note:
#
# It is possible to have both the read and write fileevents active at
# this point. The only scenario it seems to affect is a server that
# closes the connection without reading the POST data. (e.g., early
# versions TclHttpd in various error cases). Depending on the
# platform, the client may or may not be able to get the response from
# the server because of the error it will get trying to write the post
# data. Having both fileevents active changes the timing and the
# behavior, but no two platforms (among Solaris, Linux, and NT) behave
# the same, and none behave all that well in any case. Servers should
# always read their POST data if they expect the client to read their
# response.
if {$isQuery || $isQueryChannel} {
if {!$content_type_seen} {
puts $sock "Content-Type: $state(-type)"
}
if {!$contDone} {
puts $sock "Content-Length: $state(querylength)"
}
puts $sock ""
fconfigure $sock -translation {auto binary}
fileevent $sock writable [list http::Write $token]
} else {
puts $sock ""
flush $sock
fileevent $sock readable [list http::Event $sock $token]
}
} err]} {
# The socket probably was never connected, or the connection dropped
# later.
# if state(status) is error, it means someone's already called Finish
# to do the above-described clean up.
if {$state(status) ne "error"} {
Finish $token $err
}
}
}
# 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} {
if {![info exists $token]} {
return "error"
}
variable $token
upvar 0 $token state
return $state(status)
}
proc http::code {token} {
variable $token
upvar 0 $token state
return $state(http)
}
proc http::ncode {token} {
variable $token
upvar 0 $token state
if {[regexp {[0-9]{3}} $state(http) numeric_code]} {
return $numeric_code
} else {
return $state(http)
}
}
proc http::size {token} {
variable $token
upvar 0 $token state
return $state(currentsize)
}
proc http::meta {token} {
variable $token
upvar 0 $token state
return $state(meta)
}
proc http::error {token} {
variable $token
upvar 0 $token state
if {[info exists state(error)]} {
return $state(error)
}
return ""
}
# http::cleanup
#
# Garbage collect the state associated with a transaction
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# unsets the state array
proc http::cleanup {token} {
variable $token
upvar 0 $token state
if {[info exists state]} {
unset state
}
}
# http::Connect
#
# This callback is made when an asyncronous connection completes.
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# Sets the status of the connection, which unblocks
# the waiting geturl call
proc http::Connect {token proto phost srvurl} {
variable $token
upvar 0 $token state
set err "due to unexpected EOF"
if {
[eof $state(sock)] ||
[set err [fconfigure $state(sock) -error]] ne ""
} {
Finish $token "connect failed $err"
} else {
fileevent $state(sock) writable {}
::http::Connected $token $proto $phost $srvurl
}
return
}
# http::Write
#
# Write POST query data to the socket
#
# Arguments
# token The token for the connection
#
# Side Effects
# Write the socket and handle callbacks.
proc http::Write {token} {
variable $token
upvar 0 $token state
set sock $state(sock)
# Output a block. Tcl will buffer this if the socket blocks
set done 0
if {[catch {
# Catch I/O errors on dead sockets
if {[info exists state(-query)]} {
# Chop up large query strings so queryprogress callback can give
# smooth feedback.
puts -nonewline $sock \
[string range $state(-query) $state(queryoffset) \
[expr {$state(queryoffset) + $state(-queryblocksize) - 1}]]
incr state(queryoffset) $state(-queryblocksize)
if {$state(queryoffset) >= $state(querylength)} {
set state(queryoffset) $state(querylength)
set done 1
}
} else {
# Copy blocks from the query channel
set outStr [read $state(-querychannel) $state(-queryblocksize)]
puts -nonewline $sock $outStr
incr state(queryoffset) [string length $outStr]
if {[eof $state(-querychannel)]} {
set done 1
}
}
} err]} {
# Do not call Finish here, but instead let the read half of the socket
# process whatever server reply there is to get.
set state(posterror) $err
set done 1
}
if {$done} {
catch {flush $sock}
fileevent $sock writable {}
fileevent $sock readable [list http::Event $sock $token]
}
# Callback to the client after we've completely handled everything.
if {[string length $state(-queryprogress)]} {
eval $state(-queryprogress) \
[list $token $state(querylength) $state(queryoffset)]
}
}
# http::Event
#
# Handle input on the socket
#
# Arguments
# sock The socket receiving input.
# token The token returned from http::geturl
#
# Side Effects
# Read the socket and handle callbacks.
proc http::Event {sock token} {
variable $token
upvar 0 $token state
if {![info exists state]} {
Log "Event $sock with invalid token '$token' - remote close?"
if {![eof $sock]} {
if {[set d [read $sock]] ne ""} {
Log "WARNING: additional data left on closed socket"
}
}
CloseSocket $sock
return
}
if {$state(state) eq "connecting"} {
if {[catch {gets $sock state(http)} n]} {
return [Finish $token $n]
} elseif {$n >= 0} {
set state(state) "header"
}
} elseif {$state(state) eq "header"} {
if {[catch {gets $sock line} n]} {
return [Finish $token $n]
} elseif {$n == 0} {
# We have now read all headers
# We ignore HTTP/1.1 100 Continue returns. RFC2616 sec 8.2.3
if {$state(http) == "" || ([regexp {^\S+\s(\d+)} $state(http) {} x] && $x == 100)} {
set state(state) "connecting"
return
}
set state(state) body
# If doing a HEAD, then we won't get any body
if {$state(-validate)} {
Eof $token
return
}
# For non-chunked transfer we may have no body - in this case we
# may get no further file event if the connection doesn't close
# and no more data is sent. We can tell and must finish up now -
# not later.
if {
!(([info exists state(connection)]
&& ($state(connection) eq "close"))
|| [info exists state(transfer)])
&& ($state(totalsize) == 0)
} {
Log "body size is 0 and no events likely - complete."
Eof $token
return
}
# We have to use binary translation to count bytes properly.
fconfigure $sock -translation binary
if {
$state(-binary) || [IsBinaryContentType $state(type)]
} {
# Turn off conversions for non-text data
set state(binary) 1
}
if {[info exists state(-channel)]} {
if {$state(binary) || [llength [ContentEncoding $token]]} {
fconfigure $state(-channel) -translation binary
}
if {![info exists state(-handler)]} {
# Initiate a sequence of background fcopies
fileevent $sock readable {}
CopyStart $sock $token
return
}
}
} elseif {$n > 0} {
# Process header lines
if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} {
switch -- [string tolower $key] {
content-type {
set state(type) [string trim [string tolower $value]]
# grab the optional charset information
if {[regexp -nocase \
{charset\s*=\s*\"((?:[^""]|\\\")*)\"} \
$state(type) -> cs]} {
set state(charset) [string map {{\"} \"} $cs]
} else {
regexp -nocase {charset\s*=\s*(\S+?);?} \
$state(type) -> state(charset)
}
}
content-length {
set state(totalsize) [string trim $value]
}
content-encoding {
set state(coding) [string trim $value]
}
transfer-encoding {
set state(transfer) \
[string trim [string tolower $value]]
}
proxy-connection -
connection {
set state(connection) \
[string trim [string tolower $value]]
}
}
lappend state(meta) $key [string trim $value]
}
}
} else {
# Now reading body
if {[catch {
if {[info exists state(-handler)]} {
set n [eval $state(-handler) [list $sock $token]]
} elseif {[info exists state(transfer_final)]} {
set line [getTextLine $sock]
set n [string length $line]
if {$n > 0} {
Log "found $n bytes following final chunk"
append state(transfer_final) $line
} else {
Log "final chunk part"
Eof $token
}
} elseif {
[info exists state(transfer)]
&& $state(transfer) eq "chunked"
} {
set size 0
set chunk [getTextLine $sock]
set n [string length $chunk]
if {[string trim $chunk] ne ""} {
scan $chunk %x size
if {$size != 0} {
set bl [fconfigure $sock -blocking]
fconfigure $sock -blocking 1
set chunk [read $sock $size]
fconfigure $sock -blocking $bl
set n [string length $chunk]
if {$n >= 0} {
append state(body) $chunk
}
if {$size != [string length $chunk]} {
Log "WARNING: mis-sized chunk:\
was [string length $chunk], should be $size"
}
getTextLine $sock
} else {
set state(transfer_final) {}
}
}
} else {
#Log "read non-chunk $state(currentsize) of $state(totalsize)"
set block [read $sock $state(-blocksize)]
set n [string length $block]
if {$n >= 0} {
append state(body) $block
}
}
if {[info exists state]} {
if {$n >= 0} {
incr state(currentsize) $n
}
# If Content-Length - check for end of data.
if {
($state(totalsize) > 0)
&& ($state(currentsize) >= $state(totalsize))
} {
Eof $token
}
}
} err]} {
return [Finish $token $err]
} else {
if {[info exists state(-progress)]} {
eval $state(-progress) \
[list $token $state(totalsize) $state(currentsize)]
}
}
}
# catch as an Eof above may have closed the socket already
if {![catch {eof $sock} eof] && $eof} {
if {[info exists $token]} {
set state(connection) close
Eof $token
} else {
# open connection closed on a token that has been cleaned up.
CloseSocket $sock
}
return
}
}
# http::IsBinaryContentType --
#
# Determine if the content-type means that we should definitely transfer
# the data as binary. [Bug 838e99a76d]
#
# Arguments
# type The content-type of the data.
#
# Results:
# Boolean, true if we definitely should be binary.
proc http::IsBinaryContentType {type} {
lassign [split [string tolower $type] "/;"] major minor
if {$major eq "text"} {
return false
}
# There's a bunch of XML-as-application-format things about. See RFC 3023
# and so on.
if {$major eq "application"} {
set minor [string trimright $minor]
if {$minor in {"xml" "xml-external-parsed-entity" "xml-dtd"}} {
return false
}
}
# Not just application/foobar+xml but also image/svg+xml, so let us not
# restrict things for now...
if {[string match "*+xml" $minor]} {
return false
}
return true
}
# http::getTextLine --
#
# Get one line with the stream in blocking crlf mode
#
# Arguments
# sock The socket receiving input.
#
# Results:
# The line of text, without trailing newline
proc http::getTextLine {sock} {
set tr [fconfigure $sock -translation]
set bl [fconfigure $sock -blocking]
fconfigure $sock -translation crlf -blocking 1
set r [gets $sock]
fconfigure $sock -translation $tr -blocking $bl
return $r
}
# http::CopyStart
#
# Error handling wrapper around fcopy
#
# Arguments
# sock The socket to copy from
# token The token returned from http::geturl
#
# Side Effects
# This closes the connection upon error
proc http::CopyStart {sock token {initial 1}} {
upvar #0 $token state
if {[info exists state(transfer)] && $state(transfer) eq "chunked"} {
foreach coding [ContentEncoding $token] {
lappend state(zlib) [zlib stream $coding]
}
make-transformation-chunked $sock [namespace code [list CopyChunk $token]]
} else {
if {$initial} {
foreach coding [ContentEncoding $token] {
zlib push $coding $sock
}
}
if {[catch {
fcopy $sock $state(-channel) -size $state(-blocksize) -command \
[list http::CopyDone $token]
} err]} {
Finish $token $err
}
}
}
proc http::CopyChunk {token chunk} {
upvar 0 $token state
if {[set count [string length $chunk]]} {
incr state(currentsize) $count
if {[info exists state(zlib)]} {
foreach stream $state(zlib) {
set chunk [$stream add $chunk]
}
}
puts -nonewline $state(-channel) $chunk
if {[info exists state(-progress)]} {
eval [linsert $state(-progress) end \
$token $state(totalsize) $state(currentsize)]
}
} else {
Log "CopyChunk Finish $token"
if {[info exists state(zlib)]} {
set excess ""
foreach stream $state(zlib) {
catch {set excess [$stream add -finalize $excess]}
}
puts -nonewline $state(-channel) $excess
foreach stream $state(zlib) { $stream close }
unset state(zlib)
}
Eof $token ;# FIX ME: pipelining.
}
}
# http::CopyDone
#
# fcopy completion callback
#
# Arguments
# token The token returned from http::geturl
# count The amount transfered
#
# Side Effects
# Invokes callbacks
proc http::CopyDone {token count {error {}}} {
variable $token
upvar 0 $token state
set sock $state(sock)
incr state(currentsize) $count
if {[info exists state(-progress)]} {
eval $state(-progress) \
[list $token $state(totalsize) $state(currentsize)]
}
# At this point the token may have been reset
if {[string length $error]} {
Finish $token $error
} elseif {[catch {eof $sock} iseof] || $iseof} {
Eof $token
} else {
CopyStart $sock $token 0
}
}
# http::Eof
#
# Handle eof on the socket
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# Clean up the socket
proc http::Eof {token {force 0}} {
variable $token
upvar 0 $token state
if {$state(state) eq "header"} {
# Premature eof
set state(status) eof
} else {
set state(status) ok
}
if {[string length $state(body)] > 0} {
if {[catch {
foreach coding [ContentEncoding $token] {
set state(body) [zlib $coding $state(body)]
}
} err]} {
Log "error doing decompression: $err"
return [Finish $token $err]
}
if {!$state(binary)} {
# If we are getting text, set the incoming channel's encoding
# correctly. iso8859-1 is the RFC default, but this could be any IANA
# charset. However, we only know how to convert what we have
# encodings for.
set enc [CharsetToEncoding $state(charset)]
if {$enc ne "binary"} {
set state(body) [encoding convertfrom $enc $state(body)]
}
# Translate text line endings.
set state(body) [string map {\r\n \n \r \n} $state(body)]
}
}
Finish $token
}
# http::wait --
#
# See documentation 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)] || $state(status) eq ""} {
# We must wait on the original variable name, not the upvar alias
vwait ${token}(status)
}
return [status $token]
}
# http::formatQuery --
#
# See documentation 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 eq "="} {
set sep &
} else {
set sep =
}
}
return $result
}
# http::mapReply --
#
# Do x-www-urlencoded character mapping
#
# Arguments:
# string The string the needs to be encoded
#
# Results:
# The encoded string
proc http::mapReply {string} {
variable http
variable formMap
# The spec says: "non-alphanumeric characters are replaced by '%HH'". Use
# a pre-computed map and [string map] to do the conversion (much faster
# than [regsub]/[subst]). [Bug 1020491]
if {$http(-urlencoding) ne ""} {
set string [encoding convertto $http(-urlencoding) $string]
return [string map $formMap $string]
}
set converted [string map $formMap $string]
if {[string match "*\[\u0100-\uffff\]*" $converted]} {
regexp "\[\u0100-\uffff\]" $converted badChar
# Return this error message for maximum compatibility... :^/
return -code error \
"can't read \"formMap($badChar)\": no such element in array"
}
return $converted
}
# http::ProxyRequired --
# Default proxy filter.
#
# Arguments:
# host The destination host
#
# Results:
# The current proxy settings
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)]
}
}
# http::CharsetToEncoding --
#
# Tries to map a given IANA charset to a tcl encoding. If no encoding
# can be found, returns binary.
#
proc http::CharsetToEncoding {charset} {
variable encodings
set charset [string tolower $charset]
if {[regexp {iso-?8859-([0-9]+)} $charset -> num]} {
set encoding "iso8859-$num"
} elseif {[regexp {iso-?2022-(jp|kr)} $charset -> ext]} {
set encoding "iso2022-$ext"
} elseif {[regexp {shift[-_]?js} $charset]} {
set encoding "shiftjis"
} elseif {[regexp {(?:windows|cp)-?([0-9]+)} $charset -> num]} {
set encoding "cp$num"
} elseif {$charset eq "us-ascii"} {
set encoding "ascii"
} elseif {[regexp {(?:iso-?)?lat(?:in)?-?([0-9]+)} $charset -> num]} {
switch -- $num {
5 {set encoding "iso8859-9"}
1 - 2 - 3 {
set encoding "iso8859-$num"
}
}
} else {
# other charset, like euc-xx, utf-8,... may directly map to encoding
set encoding $charset
}
set idx [lsearch -exact $encodings $encoding]
if {$idx >= 0} {
return $encoding
} else {
return "binary"
}
}
# Return the list of content-encoding transformations we need to do in order.
proc http::ContentEncoding {token} {
upvar 0 $token state
set r {}
if {[info exists state(coding)]} {
foreach coding [split $state(coding) ,] {
switch -exact -- $coding {
deflate { lappend r inflate }
gzip - x-gzip { lappend r gunzip }
compress - x-compress { lappend r decompress }
identity {}
default {
return -code error "unsupported content-encoding \"$coding\""
}
}
}
}
return $r
}
proc http::make-transformation-chunked {chan command} {
set lambda {{chan command} {
set data ""
set size -1
yield
while {1} {
chan configure $chan -translation {crlf binary}
while {[gets $chan line] < 1} { yield }
chan configure $chan -translation {binary binary}
if {[scan $line %x size] != 1} { return -code error "invalid size: \"$line\"" }
set chunk ""
while {$size && ![chan eof $chan]} {
set part [chan read $chan $size]
incr size -[string length $part]
append chunk $part
}
if {[catch {
uplevel #0 [linsert $command end $chunk]
}]} {
http::Log "Error in callback: $::errorInfo"
}
if {[string length $chunk] == 0} {
# channel might have been closed in the callback
catch {chan event $chan readable {}}
return
}
}
}}
coroutine dechunk$chan ::apply $lambda $chan $command
chan event $chan readable [namespace origin dechunk$chan]
return
}
# Local variables:
# indent-tabs-mode: t
# End: