CMcC 20050227: The process of uploading a file to a server entails encoding the file (and other form elements) as multipart/form-data. The code below handles that.
The second part of the upload will use http to send a -query with -type multipart/form-data, causing the client to POST the mime multipart/form-data to the server. Voila.
Note: Has anyone been able to upload a file with this anywhere? Not only that it does not read the file in binary mode (which causes data corruption).. also the returned data does contain headerlines that do not get put in the actual http header, if you simply pass the returned block to the -query parameter of http::geturl .. which causes a wrong content-type and then everything goes down the drain..
# Provide multipart/form-data for http
package provide form-data 1.0
package require mime
namespace eval form-data {}
proc form-data::compose {partv {type multipart/form-data}} {
upvar 1 $partv parts
set mime [mime::initialize -canonical $type -parts $parts]
set packaged [mime::buildmessage $mime]
foreach part $parts {
mime::finalize $part
}
mime::finalize $mime
return $packaged
}
proc form-data::add_binary {partv name value type} {
upvar 1 $partv parts
set disposition "form-data; name=\"${name}\""
lappend parts [mime::initialize -canonical $type \
-string $value \
-encoding binary \
-header [list Content-Disposition $disposition]]
}
proc form-data::add_field {partv name value} {
upvar 1 $partv parts
set disposition "form-data; name=\"${name}\""
lappend parts [mime::initialize -canonical text/plain -string $value \
-header [list Content-Disposition $disposition]]
}
proc form-data::format {name value type args} {
set parts {}
foreach {n v} $args {
add_field parts $n $v
}
add_binary parts $name $value $type
return [compose parts]
}
if {[info script] eq $argv0} {
# format a gif file upload according to the following form:
#<FORM METHOD="POST" ENCTYPE="multipart/form-data" ACTION="upload.php">
#<INPUT TYPE="HIDDEN" NAME="MAX_FILE_SIZE" VALUE=" ">
#<INPUT TYPE="HIDDEN" NAME="action" VALUE="1">
#<INPUT TYPE="FILE" NAME="file1">
#<INPUT TYPE="SUBMIT" VALUE="Host It"> <br>
#<INPUT TYPE="text" NAME="img_resize" SIZE="4" MAXLENGTH="4">
#</FORM>
# get contents of the gif
set fd [open ./logo125.gif]
set image [read $fd]
close $fd
# set up other fields
array set fields {
MAX_FILE_SIZE " "
action 1
img_resize "100%"
}
# format the image and form
puts [form-data::format file1 $image image/gif {expand}[array get fields]]
}