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There is a newer version: 7.9.0
let api_key = ""
let base_url = "{{{basePath}}}"
let default_headers = Cohttp.Header.init_with "Content-Type" "application/json"

let option_fold f default o =
  match o with
  | Some v -> f v
  | None -> default

let build_uri operation_path = Uri.of_string (base_url ^ operation_path)

let add_string_header headers key value =
  Cohttp.Header.add headers key value

let add_string_header_multi headers key values =
  Cohttp.Header.add_multi headers key values

let add_header headers key to_string value =
  Cohttp.Header.add headers key (to_string value)

let add_header_multi headers key to_string value =
  Cohttp.Header.add_multi headers key (to_string value)

let maybe_add_header headers key to_string value =
  option_fold (add_header headers key to_string) headers value

let maybe_add_header_multi headers key to_string value =
  option_fold (add_header_multi headers key to_string) headers value

let write_string_body s = Cohttp_lwt.Body.of_string s

let write_json_body payload =
  Cohttp_lwt.Body.of_string (Yojson.Safe.to_string payload ~std:true)

let write_as_json_body to_json payload = write_json_body (to_json payload)

let handle_response resp on_success_handler =
  match Cohttp_lwt.Response.status resp with
  | #Cohttp.Code.success_status -> on_success_handler ()
  | s -> failwith ("Server responded with status " ^ Cohttp.Code.(reason_phrase_of_code (code_of_status s)))

let handle_unit_response resp = handle_response resp (fun () -> Lwt.return ())

let read_json_body resp body =
  handle_response resp (fun () ->
    (Lwt.(Cohttp_lwt.Body.to_string body >|= Yojson.Safe.from_string)))

let read_json_body_as of_json resp body =
  Lwt.(read_json_body resp body >|= of_json)

let read_json_body_as_list resp body =
  Lwt.(read_json_body resp body >|= Yojson.Safe.Util.to_list)

let read_json_body_as_list_of of_json resp body =
  Lwt.(read_json_body_as_list resp body >|= List.map of_json)

let read_json_body_as_map resp body =
  Lwt.(read_json_body resp body >|= Yojson.Safe.Util.to_assoc)

let read_json_body_as_map_of of_json resp body =
  Lwt.(read_json_body_as_map resp body >|= List.map (fun (s, v) -> (s, of_json v)))

let replace_string_path_param uri param_name param_value =
  let regexp = Str.regexp (Str.quote ("{" ^ param_name ^ "}")) in
  let path = Str.global_replace regexp param_value (Uri.pct_decode (Uri.path uri)) in
  Uri.with_path uri path

let replace_path_param uri param_name to_string param_value =
  replace_string_path_param uri param_name (to_string param_value)

let maybe_replace_path_param uri param_name to_string param_value =
  option_fold (replace_path_param uri param_name to_string) uri param_value

let add_query_param uri param_name to_string param_value =
  Uri.add_query_param' uri (param_name, to_string param_value)

let add_query_param_list uri param_name to_string param_value =
  Uri.add_query_param uri (param_name, to_string param_value)

let maybe_add_query_param uri param_name to_string param_value =
  option_fold (add_query_param uri param_name to_string) uri param_value

let init_form_encoded_body () = ""

let add_form_encoded_body_param params param_name to_string param_value =
  let new_param_enc = Printf.sprintf {|%s=%s|} (Uri.pct_encode param_name) (Uri.pct_encode (to_string param_value)) in
  if params = ""
  then new_param_enc
  else Printf.sprintf {|%s&%s|} params new_param_enc

let add_form_encoded_body_param_list params param_name to_string new_params =
  add_form_encoded_body_param params param_name (String.concat ",") (to_string new_params)

let maybe_add_form_encoded_body_param params param_name to_string param_value =
  option_fold (add_form_encoded_body_param params param_name to_string) params param_value

let finalize_form_encoded_body body = Cohttp_lwt.Body.of_string body