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#!/usr/bin/tclsh
# ---
# --- [Config] ---
# ---
# Directory to place the files to.
set outdir "out/"
# The lenght of the random name every file is assigned.
# Setting it to 0 disables random name mangling.
set mangle_lenght 6
# The characters which may appear within the basename of a generated random file name.
set mangle_char_set {0123456789abcdefghijklmnopqrstuvwxyz}
# Every random name has a chance to collide with a previously saved file.
# Theoretically if you don't clean your uploads and both your
# $::mangle_lenght and $::mangle_char_set are small, you could end up with a dead lock.
# This value is the fail-safe.
set max_save_attempts 20
# The output of this function is (ideally) what the user will see.
# I have provided a few default behaviours, but you do you champ.
proc send_success {upload_name} {
proc simple {upload_name} {
set scheme $::env(REQUEST_SCHEME)
set host $::env(HTTP_HOST)
set url "$scheme://$host/$upload_name"
puts "Status: 200 OK\r"
puts "Content-Type: text/plain\r"
puts "\r"
puts "$url"
}
proc link {upload_name} {
set scheme $::env(REQUEST_SCHEME)
set host $::env(HTTP_HOST)
set url "$scheme://$host/$upload_name"
puts "Status: 200 OK\r"
puts "Content-Type: text/html\r"
puts "\r"
puts "<a href=$url>$url</a>"
}
proc redirect {upload_name} {
set scheme $::env(REQUEST_SCHEME)
set host $::env(HTTP_HOST)
set url "$scheme://$host/$upload_name"
puts "Status: 303 See Other\r"
puts "Location: $url\r"
puts "Content-Type: text/plain\r"
puts "\r"
puts "Redirecting to $url"
}
set agent $::env(HTTP_USER_AGENT)
if {[regexp -nocase {curl} $agent]} {
simple $upload_name
} else {
link $upload_name
#redirect $upload_name
}
}
# ---
# --- [Core] ---
# ---
set method $::env(REQUEST_METHOD)
set content_length $::env(CONTENT_LENGTH)
fconfigure stdin -translation binary -encoding binary
proc raise_fatal {} {
puts "Status: 400 Bad Request\r"
puts "Content-Type: text/plain\r\n"
puts "400 Bad Request"
exit 1
}
proc splitstr {text delim} {
# I hate the antichrist;
# why the fuck isnt this standard?
# what fucking moron thought the lack of splitting would be a good addition to Tcl?
set result {}
set dlen [string length $delim]
set start 0
while {[set idx [string first $delim $text $start]] >= 0} {
lappend result [string range $text $start [expr {$idx - 1}]]
set start [expr {$idx + $dlen}]
}
lappend result [string range $text $start end]
return $result
}
proc get_out_name {orig_name} {
proc get_random_name {} {
set chars $::mangle_char_set
set name ""
for {set i 0} {$i < $::mangle_lenght} {incr i} {
append name [string index $chars [expr {int(rand()*[string length $chars])}]]
}
return $name
}
if { $::mangle_lenght == 0 } { return $orig_name }
set extension [file extension $orig_name]
for { set tries 1 } { $tries <= $::max_save_attempts } { incr tries } {
set out_name "$::outdir/[get_random_name]$extension"
if { ![file exists $out_name] } { break }
}
return $out_name
}
if { $method eq "PUT" } {
set original_name [file tail $::env(REQUEST_URI)]
proc copy_stdin {out_name} {
set f [open $out_name "wb"]
fconfigure $f -translation binary -encoding binary
chan copy stdin $f
close $f
}
set write_file copy_stdin
} elseif { $method eq "POST" } {
# NOTE:
# we must parse multipart/form-data;
# see: RFC 7578 (https://www.rfc-editor.org/rfc/rfc7578)
regexp {boundary=(.+)} $::env(CONTENT_TYPE) -> BOUNDARY
set BOUNDARY "\r\n--$BOUNDARY"
set raw [read stdin $::content_length]
# NOTE:
# It is not expected to have more then one part;
# why the hell would someone post multiple fields?
# However, it becomes a problem at somepoint,
# we simply need to find the one part that contains
# 'name="file"' on the first line, where 'file'
# is the field name specified on the form
# (the example uses 'file' as a literal).
set parts [splitstr $raw $BOUNDARY]
set part [lindex $parts 0]
if { $part eq "" } { raise_fatal }
set delim "\r\n\r\n"
set idx [string first $delim $part]
set header [string range $part 0 $idx]
set body [string range $part [expr {$idx + [string length $delim]}] end]
# NOTE:
# the filename parameter is not guaranteed to be provided
# and not guaranteed to be quoted
if {![regexp {filename="(.+)"} $header -> original_name]} { set original_name "" }
proc write_body {out_name} {
set f [open $out_name "wb"]
fconfigure $f -translation binary -encoding binary
puts -nonewline $f $::body
close $f
}
set write_file write_body
} else {
raise_fatal
}
if { ![file isdirectory $outdir] } { file mkdir $outdir }
set output_name [get_out_name $original_name]
eval $write_file $output_name
send_success $output_name
## Notes
# This is a very useful debug snippet:
#
# foreach name [lsort [array names ::env]] {
# puts stderr "$name = $::env($name)"
# }
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