R/bill.R

In congress: Access the Congress.gov API

#' Request Bill Information
#'
#' @param congress Congress number to search for. 81 or later are supported.
#' @param type Type of bill. Can be `'hr'`, `'s'`, `'hjres'`, `'sjres'`, `'hconres'`, `'sconres'`, `'hres'`, or `'sres'`.
#' @param number Bill assigned number. Numeric.
#' @param item Information to request. Can be `'actions'`, `'amendments'`, `'committees'`, `'cosponsors'`,
#' `'relatedbills'`, `'subjects'`, `'text'`, or `'titles'`
#' @param from_date start date for search, e.g. `'2022-04-01'`. Defaults to most recent.
#' @param to_date end date for search, e.g. `'2022-04-03'`. Defaults to most recent.
#' @param limit number of records to return. Default is 20. Will be truncated to between 1 and 250.
#' @param offset number of records to skip. Default is 0. Must be non-negative.
#' @param clean Default is TRUE. Should output be returned as a `tibble` (`TRUE`) or requested `format`.
#' @param format Output format for `clean = FALSE`. One of `xml` or `json`.
#'
#' @return `tibble` or HTTP response if `clean = FALSE`
#' @export
#'
#' @examplesIf congress::has_congress_key()
#' # Requires API Key
#'
#' cong_bill()
#'
#' cong_bill(congress = 117)
#'
#' cong_bill(congress = 117, type = 'hr', number = 3076)
#'
#' cong_bill(congress = 117, type = 'hr', number = 3076, item = 'actions')
#'
cong_bill <- function(congress = NULL, type = NULL, number = NULL, item = NULL,
                      from_date = NULL, to_date = NULL,
                      limit = 20, offset = 0,
                      format = 'json', clean = TRUE) {
  sort <- NULL
  check_format(format)
  from_date <- check_date(from_date)
  to_date <- check_date(to_date)
  if (is.null(from_date) & !is.null(to_date) || !is.null(from_date) & is.null(to_date)) {
    cli::cli_abort('Either both or neither of {.arg from_date} and {.arg to_date} must be specified.')
  }

  endpt <- bill_endpoint(congress = congress, type = type, number = number, item = item)
  req <- httr2::request(base_url = api_url()) |>
    httr2::req_url_path_append(endpt) |>
    httr2::req_url_query(
      'api_key' = get_congress_key(),
      'fromDateTime' = from_date,
      'toDateTime' = to_date,
      'sort' = sort,
      'limit' = min(max(limit, 1), 250),
      'offset' = max(offset, 0)
    ) |>
    httr2::req_headers(
      "accept" = glue::glue("application/{format}")
    )
  resp <- req |>
    httr2::req_perform()

  formatter <- switch(format,
                      'json' = httr2::resp_body_json,
                      'xml' = httr2::resp_body_xml
  )

  out <- resp <- resp |>
    formatter()

  if (clean) {
    if (is.null(number)) {
      out <- out |>
        purrr::pluck('bills') |>
        list_hoist() |>
        clean_names()
    } else {
      if (is.null(item)) {
        out <- out |>
          purrr::pluck('bill') |>
          tibble::enframe() |>
          tidyr::pivot_wider() |>
          tidyr::unnest_wider(col = where(~purrr::pluck_depth(.x) < 4), simplify = TRUE, names_sep = '_') |>
          dplyr::rename_with(.fn = function(x) stringr::str_sub(x, end = -3), .cols = dplyr::ends_with('_1')) |>
          clean_names()
      } else {
        if (item == 'text')  {
          item <- 'textVersions'
          out <- out |>
            purrr::pluck(item)

          out <- lapply(out, function(x) {
            x[[2]] <- x$formats |>
              dplyr::bind_rows() |>
              tidyr::pivot_wider(names_from = 'type', values_from = 'url') |>
              dplyr::rename_with(.fn = function(x) paste0('url_', str_colname(x)))
            x
          })

          out <- out |>
            dplyr::bind_rows() |>
            tidyr::unnest_wider(col = 'formats') |>
            clean_names()
        } else {
          out <- out |>
            purrr::pluck(item) |>
            list_hoist() |>
            clean_names()
       }

      }
    }
    out <- out |>
      add_resp_info(resp) |>
      cast_date_columns()
  }
  out
}

bill_items <- c('actions', 'amendments', 'committees', 'cosponsors', 'relatedbills', 'subjects', 'text', 'titles')
bill_types <- c('hr', 's', 'hjres', 'sjres', 'hconres', 'sconres', 'hres', 'sres')

bill_endpoint <- function(congress, type, number, item) {
  out <- 'bill'
  if (!is.null(congress)) {
    out <- paste0(out, '/', congress)
    if (!is.null(type)) {
      out <- paste0(out, '/', type)
      if (!is.null(number)) {
        out <- paste0(out, '/', number)
        if (!is.null(item)) {
          out <- paste0(out, '/', item)
        }
      }
    }
  }

  tolower(out)
}