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A complete and correct Bencode encoder and decoder written in pure Elixir. The decoder will return the info hash with along with the decoded data, and the encoder is implemented as a protocol, allowing any data structure to be bcode encoded.
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lib/bencode/encoder.ex
defprotocol Bencode.Encoder do
def encode(data)
end
defimpl Bencode.Encoder, for: Integer do
def encode(number),
do: "i#{number}e"
end
defimpl Bencode.Encoder, for: BitString do
def encode(string),
do: "#{byte_size string}:#{string}"
end
defimpl Bencode.Encoder, for: List do
def encode(data),
do: "l#{Enum.map_join(data, &Bencode.Encoder.encode/1)}e"
end
defimpl Bencode.Encoder, for: Map do
def encode(data),
do: "d#{Enum.map_join(data, &encode_pair/1)}e"
defp encode_pair({key, value}) when is_bitstring(key),
do: "#{Bencode.Encoder.encode key}#{Bencode.Encoder.encode value}"
defp encode_pair({key, value}) when is_atom(key) do
key_string = Atom.to_string key
"#{Bencode.Encoder.encode key_string}#{Bencode.Encoder.encode value}"
end
end