R/get_all_parties.R

In stortingscrape: Access Data from the Norwegian Parliament API

#' All parliamentary parties
#' 
#' @description A function for retrieving all Norwegian parliamentary parties in the 
#' data.stortinget.no API.
#' 
#' @usage get_all_parties()
#'  
#' @return A data.frame of all parties, with the variables:
#' 
#' |                       |                                                          |
#' |:----------------------|:---------------------------------------------------------|
#' | **response_date**     | Date of data retrieval                                   |
#' | **version**           | Data version from the API                                |
#' | **id**                | Id of the party                                          |
#' | **name**              | Name of the party                                        |
#' | **represented_party** | Whether the party is represented at the time of download |
#' | **sessionid**         | Id of session (empty)                                    |
#' | **period_id**         | Id of parliamentary period (empty)                       |
#' 
#' @md
#' 
#' @seealso [get_session_parties]
#' 
#' 
#' @examples 
#' \dontrun{
#' parties <- get_all_parties()
#' head(parties)
#' }
#' 
#' @import httr2 rvest
#' @export
get_all_parties <- function(){
  
  url <- "https://data.stortinget.no/eksport/allepartier"

  base <- request(url)
  
  resp <- base |> 
    req_error(is_error = function(resp) FALSE) |> 
    req_perform()
  
  if(resp$status_code != 200) {
    stop(
      paste0(
        "Response of ", 
        url, 
        " is '", 
        resp |> resp_status_desc(),
        "' (",
        resp$status_code,
        ")."
        ), 
      call. = FALSE)
  }

  if(resp_content_type(resp) != "text/xml") {
    stop(
      paste0(
        "Response of ", 
        url, 
        " returned as '", 
        resp_content_type(resp), 
        "'.",
        " Should be 'text/xml'."), 
      call. = FALSE) 
  }
  
  tmp <- resp |> 
    resp_body_html(check_type = FALSE, encoding = "utf-8") 
  
  tmp <- data.frame(response_date = tmp |> html_elements("partier_liste > parti > respons_dato_tid") |> html_text(),
                    version = tmp |> html_elements("partier_liste > parti > versjon") |> html_text(),
                    id = tmp |> html_elements("partier_liste > parti > id") |> html_text(),
                    name = tmp |> html_elements("partier_liste > parti > navn") |> html_text(),
                    represented_party = tmp |> html_elements("partier_liste > parti > representert_parti") |> html_text(),
                    sessionid = tmp |> html_elements("sesjon_id") |> html_text(),
                    period_id = tmp |> html_elements("stortingsperiode_id") |> html_text())
  
  return(tmp)
  
}