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An Elixir Session Initiation Protocol (SIP) stack.
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lib/sippet/message/request_line.ex
defmodule Sippet.Message.RequestLine do
@moduledoc """
A SIP Request-Line struct, composed by the Method, Request-URI and
SIP-Version.
The `start_line` of requests are represented by this struct. The RFC 3261
represents the Request-Line as:
Request-Line = Method SP Request-URI SP SIP-Version CRLF
The above `Method` is represented by atoms, when the method is a known one,
or by binaries, when the method is unknown. Known ones are `:ack`, `:invite`,
`:register`, `:cancel`, `:message` and all others returned by the function
`Sippet.Message.known_methods/0`.
The `Request-URI` is represented by a `Sippet.URI` struct, breaking down the
SIP-URI in more useful parts for processing.
The `SIP-Version` is a `{major, minor}` tuple, which assumes the value
`{2, 0}` in standard implementations.
"""
alias Sippet.URI, as: URI
defstruct [
method: nil,
request_uri: nil,
version: {2, 0}
]
@type method :: Sippet.Message.method
@type uri :: URI.t
@type version :: {integer, integer}
@type t :: %__MODULE__{
method: method,
request_uri: uri,
version: version
}
@doc """
Creates a Request-Line struct.
The version will assume the default value `{2, 0}`.
"""
@spec new(method, uri | binary) :: t
def new(method, %URI{} = request_uri)
when is_atom(method) or is_binary(method) do
%__MODULE__{
method: method,
request_uri: request_uri,
}
end
def new(method, request_uri)
when is_binary(request_uri) do
new(method, URI.parse!(request_uri))
end
@doc """
Returns a binary which corresponds to the text representation of the given
Request-Line.
It does not includes an ending line CRLF.
"""
@spec to_string(t) :: binary
defdelegate to_string(value), to: String.Chars.Sippet.Message.RequestLine
@doc """
Returns an iodata which corresponds to the text representation of the given
Request-Line.
It does not includes an ending line CRLF.
"""
@spec to_iodata(t) :: iodata
def to_iodata(%Sippet.Message.RequestLine{version: {major, minor},
request_uri: uri, method: method}) do
[if(is_atom(method), do: String.upcase(Atom.to_string(method)), else: method),
" ", Sippet.URI.to_string(uri),
" SIP/", Integer.to_string(major), ".", Integer.to_string(minor)]
end
end
defimpl String.Chars, for: Sippet.Message.RequestLine do
alias Sippet.Message.RequestLine, as: RequestLine
def to_string(%RequestLine{} = request_line) do
request_line
|> RequestLine.to_iodata()
|> IO.iodata_to_binary
end
end