module MIME::Multipart

The MIME::Multipart module contains utilities for parsing MIME multipart messages, which contain multiple body parts, each containing a header section and binary body. The multipart/form-data content-type has a separate set of utilities in the HTTP::FormData module.

Class methods

.build(io : IO, boundary : String = Multipart

Yields a Multipart::Builder to the given block, writing to io and using boundary. #finish is automatically called on the builder.

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.build(boundary : String = Multipart

Yields a Multipart::Builder to the given block, returning the generated message as a String.

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.generate_boundary : String

Returns a unique string suitable for use as a multipart boundary.

require "mime/multipart"

MIME::Multipart.generate_boundary # => "---------------------------dQu6bXHYb4m5zrRC3xPTGwV"

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.parse

Parses a MIME multipart message, yielding HTTP::Headers and an IO for each body part.

Please note that the IO object yielded to the block is only valid while the block is executing. The IO is closed as soon as the supplied block returns.

require "mime/multipart"

multipart = "--aA40\r\nContent-Type: text/plain\r\n\r\nbody\r\n--aA40--"
MIME::Multipart.parse(IO::Memory.new(multipart), "aA40") do |headers, io|
  headers["Content-Type"] # => "text/plain"
  io.gets_to_end          # => "body"
end

See: Multipart::Parser

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.parse(request : HTTP::Request

Parses a MIME multipart message, yielding HTTP::Headers and an IO for each body part.

Please note that the IO object yielded to the block is only valid while the block is executing. The IO is closed as soon as the supplied block returns.

require "http"
require "mime/multipart"

headers = HTTP::Headers{"Content-Type" => "multipart/mixed; boundary=aA40"}
body = "--aA40\r\nContent-Type: text/plain\r\n\r\nbody\r\n--aA40--"
request = HTTP::Request.new("POST", "/", headers, body)

MIME::Multipart.parse(request) do |headers, io|
  headers["Content-Type"] # => "text/plain"
  io.gets_to_end          # => "body"
end

See: Multipart::Parser

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.parse_boundary(content_type)

Extracts the multipart boundary from the Content-Type header. May return nil is the boundary was not found.

require "mime/multipart"

MIME::Multipart.parse_boundary("multipart/mixed; boundary=\"abcde\"") # => "abcde"

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