%% WARNING: DO NOT EDIT, AUTO-GENERATED CODE!
%% See https://github.com/aws-beam/aws-codegen for more details.

%% @doc AWS Single Sign-On (SSO) OpenID Connect (OIDC) is a web service that
%% enables a client (such as AWS CLI or a native application) to register
%% with AWS SSO.
%%
%% The service also enables the client to fetch the user’s access token upon
%% successful authentication and authorization with AWS SSO. This service
%% conforms with the OAuth 2.0 based implementation of the device
%% authorization grant standard ([https://tools.ietf.org/html/rfc8628]).
%%
%% For general information about AWS SSO, see What is AWS Single Sign-On? in
%% the AWS SSO User Guide.
%%
%% This API reference guide describes the AWS SSO OIDC operations that you
%% can call programatically and includes detailed information on data types
%% and errors.
%%
%% AWS provides SDKs that consist of libraries and sample code for various
%% programming languages and platforms such as Java, Ruby, .Net, iOS, and
%% Android. The SDKs provide a convenient way to create programmatic access
%% to AWS SSO and other AWS services. For more information about the AWS
%% SDKs, including how to download and install them, see Tools for Amazon Web
%% Services.
-module(aws_sso_oidc).

-export([create_token/2,
         create_token/3,
         register_client/2,
         register_client/3,
         start_device_authorization/2,
         start_device_authorization/3]).

-include_lib("hackney/include/hackney_lib.hrl").

%%====================================================================
%% API
%%====================================================================

%% @doc Creates and returns an access token for the authorized client.
%%
%% The access token issued will be used to fetch short-term credentials for
%% the assigned roles in the AWS account.
create_token(Client, Input) ->
    create_token(Client, Input, []).
create_token(Client, Input0, Options0) ->
    Method = post,
    Path = ["/token"],
    SuccessStatusCode = undefined,
    Options = [{send_body_as_binary, false},
               {receive_body_as_binary, false}
               | Options0],


    Headers = [],
    Input1 = Input0,

    Query_ = [],
    Input = Input1,

    request(Client, Method, Path, Query_, Headers, Input, Options, SuccessStatusCode).

%% @doc Registers a client with AWS SSO.
%%
%% This allows clients to initiate device authorization. The output should be
%% persisted for reuse through many authentication requests.
register_client(Client, Input) ->
    register_client(Client, Input, []).
register_client(Client, Input0, Options0) ->
    Method = post,
    Path = ["/client/register"],
    SuccessStatusCode = undefined,
    Options = [{send_body_as_binary, false},
               {receive_body_as_binary, false}
               | Options0],


    Headers = [],
    Input1 = Input0,

    Query_ = [],
    Input = Input1,

    request(Client, Method, Path, Query_, Headers, Input, Options, SuccessStatusCode).

%% @doc Initiates device authorization by requesting a pair of verification
%% codes from the authorization service.
start_device_authorization(Client, Input) ->
    start_device_authorization(Client, Input, []).
start_device_authorization(Client, Input0, Options0) ->
    Method = post,
    Path = ["/device_authorization"],
    SuccessStatusCode = undefined,
    Options = [{send_body_as_binary, false},
               {receive_body_as_binary, false}
               | Options0],


    Headers = [],
    Input1 = Input0,

    Query_ = [],
    Input = Input1,

    request(Client, Method, Path, Query_, Headers, Input, Options, SuccessStatusCode).

%%====================================================================
%% Internal functions
%%====================================================================

-spec request(aws_client:aws_client(), atom(), iolist(), list(),
              list(), map() | undefined, list(), pos_integer() | undefined) ->
    {ok, Result, {integer(), list(), hackney:client()}} |
    {error, Error, {integer(), list(), hackney:client()}} |
    {error, term()} when
    Result :: map(),
    Error :: map().
request(Client, Method, Path, Query, Headers0, Input, Options, SuccessStatusCode) ->
    Client1 = Client#{service => <<"awsssooidc">>},
    Host = build_host(<<"oidc">>, Client1),
    URL0 = build_url(Host, Path, Client1),
    URL = aws_request:add_query(URL0, Query),
    AdditionalHeaders = [ {<<"Host">>, Host}
                        , {<<"Content-Type">>, <<"application/x-amz-json-1.1">>}
                        ],
    Headers1 = aws_request:add_headers(AdditionalHeaders, Headers0),

    Payload =
      case proplists:get_value(send_body_as_binary, Options) of
        true ->
          maps:get(<<"Body">>, Input, <<"">>);
        false ->
          encode_payload(Input)
      end,

    MethodBin = aws_request:method_to_binary(Method),
    SignedHeaders = aws_request:sign_request(Client1, MethodBin, URL, Headers1, Payload),
    Response = hackney:request(Method, URL, SignedHeaders, Payload, Options),
    DecodeBody = not proplists:get_value(receive_body_as_binary, Options),
    handle_response(Response, SuccessStatusCode, DecodeBody).

handle_response({ok, StatusCode, ResponseHeaders, Client}, SuccessStatusCode, DecodeBody)
  when StatusCode =:= 200;
       StatusCode =:= 202;
       StatusCode =:= 204;
       StatusCode =:= SuccessStatusCode ->
    case hackney:body(Client) of
        {ok, <<>>} when StatusCode =:= 200;
                        StatusCode =:= SuccessStatusCode ->
            {ok, #{}, {StatusCode, ResponseHeaders, Client}};
        {ok, Body} ->
            Result = case DecodeBody of
                       true -> jsx:decode(Body);
                       false -> #{<<"Body">> => Body}
                     end,
            {ok, Result, {StatusCode, ResponseHeaders, Client}}
    end;
handle_response({ok, StatusCode, ResponseHeaders, Client}, _, _DecodeBody) ->
    {ok, Body} = hackney:body(Client),
    Error = jsx:decode(Body),
    {error, Error, {StatusCode, ResponseHeaders, Client}};
handle_response({error, Reason}, _, _DecodeBody) ->
  {error, Reason}.

build_host(_EndpointPrefix, #{region := <<"local">>, endpoint := Endpoint}) ->
    Endpoint;
build_host(_EndpointPrefix, #{region := <<"local">>}) ->
    <<"localhost">>;
build_host(EndpointPrefix, #{region := Region, endpoint := Endpoint}) ->
    aws_util:binary_join([EndpointPrefix, Region, Endpoint], <<".">>).

build_url(Host, Path0, Client) ->
    Proto = maps:get(proto, Client),
    Path = erlang:iolist_to_binary(Path0),
    Port = maps:get(port, Client),
    aws_util:binary_join([Proto, <<"://">>, Host, <<":">>, Port, Path], <<"">>).

-spec encode_payload(undefined | map()) -> binary().
encode_payload(undefined) ->
  <<>>;
encode_payload(Input) ->
  jsx:encode(Input).