Uploading a multipart form with Net::HTTP

[Austin Ziegler]

Did anyone ever figure this out?

Chris Morris had a message that indicated that he couldn't get it
working, back in 2003. I have a desparate need for this to work, and
I'm not really sure where to begin.

-austin

 

[Patrick May]

Austin,

This stuff might be useful. This was part of a wiki migration script.
I modified it so you wouldn't have to install narf to use it, but
you'll need to find a replacement for Web::Mime::get_mime_type in
FileParam#to_multipart. Or you could hard code the mime-type.

Cheers,

Patrick

------------------

require 'open-uri'
require 'net/http'
require 'cgi'

def post( query, headers={} )
Net::HTTP.start( "www.yourserver.com", 80 ) { |h|
h.post( "/cgi-bin/your_script.rb", query, headers )
}
end

class Param
attr_accessor :k, :v
def initialize( k, v )
@k = k
@v = v
end

def to_multipart
return "Content-Disposition: form-data;
name=\"#{CGI::escape(k)}\"\r\n\r\n#{v}\r\n"
end
end

class FileParam
attr_accessor :k, :filename, :content
def initialize( k, filename, content )
@k = k
@filename = filename
@content = content
end

def to_multipart
return "Content-Disposition: form-data; name=\"#{CGI::escape(k)}\";
filename=\"#{filename}\"\r\n" +
"Content-Transfer-Encoding: binary\r\n" +
"Content-Type: #{Web::Mime.get_mime_type(filename)}\r\n\r\n"
+ content + "\r\n"

end
end

filename = 'some_image.jpg'
content = open( 'some_image.jpg' ) { |f|
f.read
}

boundary = "7d21f962d00c4"
params = [ Param.new( "action", "Upload" ),
FileParam.new( "upload", filename, content ) ]

query = params.collect { |p|
"--" + boundary + "\r\n" + p.to_multipart
}.join("") + "--" + boundary + "--"

resp, data = post( query, "Content-type" => "multipart/form-data,
boundary=" + boundary + " " )

 

[Patrick May]

Also,

Austin,

This stuff might be useful. This was part of a wiki migration
script. I modified it so you wouldn't have to install narf to use it,
but you'll need to find a replacement for Web::Mime::get_mime_type in
FileParam#to_multipart. Or you could hard code the mime-type.

Cheers,

Patrick

open-uri is actually not necessary; left over from my script.

require 'net/http'
require 'cgi'

def post( query, headers={} )
Net::HTTP.start( "www.yourserver.com", 80 ) { |h|
h.post( "/cgi-bin/your_script.rb", query, headers )
}
end

class Param
attr_accessor :k, :v
def initialize( k, v )
@k = k
@v = v
end

def to_multipart
return "Content-Disposition: form-data;
name=\"#{CGI::escape(k)}\"\r\n\r\n#{v}\r\n"
end
end

class FileParam
attr_accessor :k, :filename, :content
def initialize( k, filename, content )
@k = k
@filename = filename
@content = content
end

def to_multipart
return "Content-Disposition: form-data;
name=\"#{CGI::escape(k)}\"; filename=\"#{filename}\"\r\n" +
"Content-Transfer-Encoding: binary\r\n" +
"Content-Type:
#{Web::Mime.get_mime_type(filename)}\r\n\r\n" + content + "\r\n"

end
end

filename = 'some_image.jpg'
content = open( 'some_image.jpg' ) { |f|
f.read
}

boundary = "7d21f962d00c4"
params = [ Param.new( "action", "Upload" ),
FileParam.new( "upload", filename, content ) ]

query = params.collect { |p|
"--" + boundary + "\r\n" + p.to_multipart
}.join("") + "--" + boundary + "--"

resp, data = post( query, "Content-type" => "multipart/form-data,
boundary=" + boundary + " " )

The boundary stuff is the delicate part here. If something is wrong,
this would be where it would be, I think.

Cheers,

patrick

 

[Austin Ziegler]

Austin,

This stuff might be useful. This was part of a wiki migration script.
I modified it so you wouldn't have to install narf to use it, but
you'll need to find a replacement for Web::Mime::get_mime_type in
FileParam#to_multipart. Or you could hard code the mime-type.

Thank you. What does Web::Mime::get_mime_type do? Perhaps you
could/should be using my centralised database in MIME::Types -- I'm
planning at some point on extending that in two ways. First, I plan on
using the freedesktop.org shared mime database as an option, and
second I plan on implementing libmmagic in pure Ruby (so you don't
have to trust the extension of the file if you don't choose to do so).

------------------

require 'open-uri'
require 'net/http'
require 'cgi'

def post( query, headers={} )
Net::HTTP.start( "www.yourserver.com ", 80 ) { |h|
h.post( "/cgi-bin/your_script.rb", query, headers )
}
end

class Param
attr_accessor :k, :v
def initialize( k, v )
@k = k
@v = v
end

def to_multipart
return "Content-Disposition: form-data;
name=\"#{CGI::escape(k)}\"\r\n\r\n#{v}\r\n"
end
end

class FileParam
attr_accessor :k, :filename, :content
def initialize( k, filename, content )
@k = k
@filename = filename
@content = content
end

def to_multipart
return "Content-Disposition: form-data; name=\"#{CGI::escape(k)}\";
filename=\"#{filename}\"\r\n" +
"Content-Transfer-Encoding: binary\r\n" +
"Content-Type: #{Web::Mime.get_mime_type(filename)}\r\n\r\n"
+ content + "\r\n"

end
end

filename = 'some_image.jpg'
content = open( 'some_image.jpg' ) { |f|
f.read
}

boundary = "7d21f962d00c4"
params = [ Param.new( "action", "Upload" ),
FileParam.new( "upload", filename, content ) ]

query = params.collect { |p|
"--" + boundary + "\r\n" + p.to_multipart
}.join("") + "--" + boundary + "--"

resp, data = post( query, "Content-type" => "multipart/form-data,
boundary=" + boundary + " " )

Did anyone ever figure this out?

Chris Morris had a message that indicated that he couldn't get it
working, back in 2003. I have a desparate need for this to work, and
I'm not really sure where to begin.

-austin

 

[Patrick May]

Thank you. What does Web::Mime::get_mime_type do? Perhaps you
could/should be using my centralised database in MIME::Types -- I'm
planning at some point on extending that in two ways. First, I plan on
using the freedesktop.org shared mime database as an option, and
second I plan on implementing libmmagic in pure Ruby (so you don't
have to trust the extension of the file if you don't choose to do so).

Web::Mime is a class in narf that gets mime types by filename
extension. It parses a copy of Apache's mime.types file. It's not an
exciting class; you should be able to replace that call with anything
that returns the appropriate mime type.

At the moment, I'm managing my own dependencies to keep the
installation of narf as simple as possible. I know that's a bit
anti-social, but it makes it easier for me to support narf.

Cheers,

Patrick