R/utils.R

In paul0vinicius/rmargatsni: Wraps the Instagram API for data analysis

if (getRversion() >= "2.15.1")  utils::globalVariables(".")

#' Recovers a json from a URL using HTTP.
#'
#' @param full_link URL admitting GET HTTP requests.
#'
#' @return the json.
#'
#' @examples
#'
#' @export
.get_json <- function(response){

  r <- httr::content(response, as = "text")
  r_json <- jsonlite::fromJSON(r, flatten = T)

  return(r_json)
}

#' Wraps an access to the Instagram API given a relative path and query arguments.
#'
#' @param path URL relative to the API base URL
#' @param query Query parameters
#'
#' @export
.instagram_api <- function(path=NULL, query=NULL, token=NULL){

  ua <- httr::user_agent(.RMARGATSNI_LINK)
  api_url <- httr::modify_url(.API_LINK, path = path, query = query, token=token)

  resp <- httr::GET(api_url, ua, httr::accept_json())

  httr::stop_for_status(resp)

  if (httr::http_type(resp) != "application/json") {
    stop(.ERRO_RETORNO_JSON, call. = FALSE)
  }

  .get_json(resp)
}

.remove_lists_and_nulls <- function(x){
  arr_null <- which(sapply(x, is.null))
  if (length(arr_null)){
    x <- x[-arr_null]
  }

  arr_lists <- which(sapply(x, is.list))
  if (length(arr_lists)){
    x <- x[-arr_lists]
  }

  tibble::as.tibble(x)
}