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# Copyright 2019 Hubert Chathi <hubert@uhoreg.ca>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
defmodule Polyjuice.Client.Endpoint do
@moduledoc false
defmodule HttpSpec do
@typedoc """
The description of how to handle the endpoint.
- `method` is the HTTP verb
- `headers` is a list of the HTTP headers
- `url` is the URL to call
- `body` is the HTTP body (if any)
- `transform` is a function to transform the result (status code, headers, content) to a return value
- `auth_required` indicates whether the end point requires authentication
"""
@type t :: %__MODULE__{
method: atom,
headers: [{String.t(), String.t()}],
url: String.t(),
body: String.t(),
auth_required: true | false
}
@enforce_keys [:method, :headers, :url]
defstruct [
:method,
:headers,
:url,
body: "",
auth_required: true
]
end
defprotocol Proto do
@moduledoc """
Matrix client endpoint.
"""
@doc """
Generate the spec for calling the endpoint via HTTP.
"""
@spec http_spec(
endpoint_args :: __MODULE__.t(),
base_url :: String.t()
) :: Polyjuice.Client.Endpoint.HttpSpec.t()
def http_spec(endpoint_args, base_url)
@doc """
Transform the HTTP result into a return value.
"""
@spec transform_http_result(
endpoint_args :: __MODULE__.t(),
status_code :: integer(),
headers :: [{String.t(), String.t()}, ...],
body :: String.t()
) :: any
def transform_http_result(endpoint_args, status_code, headers, body)
end
defprotocol BodyParser do
@fallback_to_any true
@spec parse(endpoint_args :: __MODULE__.t(), body :: any) :: {:ok, any} | any
def parse(endpoint_args, body)
end
defimpl BodyParser, for: Any do
def parse(_endpoint_args, body), do: {:ok, body}
end
@spec parse_response(
endpoint_args :: map,
status_code :: integer(),
headers :: [{String.t(), String.t()}, ...],
body :: String.t()
) :: {:ok, any} | any
def parse_response(%{} = endpoint_args, status_code, headers, body)
when is_integer(status_code) and is_list(headers) and is_binary(body) do
# FIXME: check if content type is "application/json"
with {:ok, json} <- Poison.decode(body) do
case status_code do
200 ->
Polyjuice.Client.Endpoint.BodyParser.parse(endpoint_args, json)
_ ->
{:error, status_code, json}
end
else
_ ->
{:error, if(status_code == 200, do: 500, else: status_code),
%{"errcode" => "CA_UHOREG_POLYJUICE_BAD_RESPONSE", "body" => body}}
end
end
end
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