Rails - Sep 2008 - Using multipart/form-data when calling 'post' in tests

Hi,
Has anyone used ActionController::Integration::Session#post in their
integration tests to post multipart/form-data encoded parameters?
eg
    my_session.post url , encoded_string , headers
where ''headers'' includes the content-type and content-length.

Is there a library which will help generate this encoded string in ruby?
eg Net::HTTP::Post or something in rails?

I''ve started looking at RFC 2046, and various fragments people have
posted in the past - but I live in hope.

Regards,
Daniel
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Daniel Bush wrote:
> Hi,
> Has anyone used ActionController::Integration::Session#post in their
> integration tests to post multipart/form-data encoded parameters?
> eg
>     my_session.post url , encoded_string , headers
> where ''headers'' includes the content-type and
content-length.
> 
> Is there a library which will help generate this encoded string in ruby?
> eg Net::HTTP::Post or something in rails?
> 
> I''ve started looking at RFC 2046, and various fragments people
have
> posted in the past - but I live in hope.
> 
> Regards,
> Daniel
Ok, to answer my own post in part:
If you''re going to write your own multipart/form-data encoding routine,
then remember these 2 things:
1) prepend the boundary string with 2 dashes ''--'' when using
it
2) don''t forget to append 2 dashes on the end of the last boundary

May as well post what I did:

In an integration test:
---
headers , encoded = encode_multipart(
  {:id => xyz , :foo => ''bar'' } ,
  :image_param_name ,
  image_file_path,
  ''image/jpeg''
)
my_session.post ''/admin/image_manager/update'',encoded,headers
---

Code:
---
EOL = "\015\012"  # "\r\n"
# Encode params and image in multipart/form-data.
def encode_multipart params,image_param,image_file_path,content_type
  headers={}
  parts=[]
  boundary="----234092834029834092830498"
  params.each_pair do |key,val|
    parts.push %{Content-Disposition: form-data; }+
               %{name="#{key}"#{EOL}#{EOL}#{val}#{EOL}}
  end
  image_part = \
    %{Content-Disposition: form-data; name="#{image_param}"; }+
    %{filename="#{File.basename(image_file_path)}"#{EOL}}+
    %{Content-Type: #{content_type}#{EOL}#{EOL}}
  image_part << File.read(image_file_path) << EOL
  parts.push image_part
  body = parts.join("--#{boundary}#{EOL}")
  body = "--#{boundary}#{EOL}" + body +
"--#{boundary}--"+EOL
  headers[''Content-Type'']="multipart/form-data;
boundary=#{boundary}"
  #headers[''Content-Length'']=body.size
  [ headers , body ]
end
---

Daniel
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