akkoma/lib/pleroma/web/http_signatures/http_signatures.ex

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2017-09-18 09:39:57 +00:00
# https://tools.ietf.org/html/draft-cavage-http-signatures-08
defmodule Pleroma.Web.HTTPSignatures do
def split_signature(sig) do
default = %{"headers" => ["date"]}
sig
|> String.trim()
|> String.split(",")
|> Enum.reduce(default, fn(part, acc) ->
[key | rest] = String.split(part, "=")
value = Enum.join(rest, "=")
Map.put(acc, key, String.trim(value, "\""))
end)
end
def validate(headers, signature, public_key) do
sigstring = build_signing_string(headers, signature["headers"])
{:ok, sig} = Base.decode64(signature["signature"])
verify = :public_key.verify(sigstring, :sha256, sig, public_key)
end
def build_signing_string(headers, used_headers) do
used_headers
|> Enum.map(fn (header) -> "#{header}: #{headers[header]}" end)
|> Enum.join("\n")
end
end