class HTTP::FormData::Builder

Overview

Builds a multipart/form-data message.

Example

io = IO::Memory.new
builder = HTTP::FormData::Builder.new(io, "aA47")
builder.field("name", "joe")
file = IO::Memory.new "file contents"
builder.file("upload", io, FileMetadata.new(filename: "test.txt"))
builder.finish
io.to_s # => "--aA47\r\nContent-Disposition: form-data; name=\"name\"\r\n\r\njoe\r\n--aA47\r\nContent-Disposition: form-data; name=\"upload\"; filename=\"test.txt\"\r\n\r\nfile contents\r\n--aA47--"

Defined in:

http/formdata/builder.cr

Constructors

Instance Method Summary

Instance methods inherited from class Reference

==(other : self)
==(other) ==, dup dup, hash hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self from_json, from_yaml(string_or_io) : self from_yaml

Constructor Detail

def self.new(io : IO, boundary = Multipart.generate_boundary) #

Creates a new FormData::Builder which writes to io, using the multipart boundary boundary.


View source

Instance Method Detail

def boundary : String #

View source
def content_type #

Returns a content type header with correct boundary parameter.

builder = HTTP::FormData::Builder.new(io, "a4VF")
builder.content_type # => "multipart/form-data; boundary=\"a4VF\""

View source
def field(name, value, headers : HTTP::Headers = HTTP::Headers.new) #

Adds a form part with the given name and value. Headers can optionally be provided for the form part.


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def file(name, io, metadata : FileMetadata = FileMetadata.new, headers : HTTP::Headers = HTTP::Headers.new) #

Adds a form part called name, with data from io as the value. Metadata can be provided to add extra metadata about the file to the Content-Disposition header for the form part. Other headers can be added using headers.


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def finish #

Finalizes the multipart message, this method must be called before the generated multipart message written to the IO is considered valid.


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