#' @title Trending GIFs
#' @description Fetch GIFs currently trending online. Hand curated by the Giphy editorial team. The data returned mirrors the GIFs showcased on the Giphy homepage. Returns 25 results by default.
#'
#' @param limit - The number of results to return, up to 100. The default is \code{limit=25}.
#' @param rating - A rating for age appropriate gifs. Options include \code{"y"}, \code{"g"}, \code{"pg"}, \code{"pg-13"} and \code{"r"}.
#' @param sticker Should a GIF be returned or an animated sticker (with transparent background)? Default to \code{FALSE}.
#' @param api_key - Giphy provides a default \code{api_key} value for public beta testing: \code{"dc6zaTOxFJmzC"}. This is the default value.
#'
#' @importFrom jsonlite fromJSON
#' @importFrom httr content GET
#'
#' @author Simon J. Goring \email{simon.j.goring@@gmail.com}
#' @details
#' Finds gifs that are currently trending through giphy's services.
#' Be aware that failure to use the \code{rating} tag may result in gifs that are not safe for work use.
#' The default API key used here is for testing purposes only. More information on the use of the giphy API is available at \url{https://github.com/Giphy/GiphyAPI}
#' @examples
#' gif <- trending(rating = 'pg', limit = 10)
#' plot(gif, n = 2)
#'
#' # Generate a smaller gif with transparent background using the sticker flag:
#' gif <- trending(rating = 'pg', limit = 10, sticker = TRUE)
#' plot(gif, n = 2)
#'
#' @export
trending <- function(limit = 25, rating = NULL, sticker = FALSE, api_key = 'dc6zaTOxFJmzC') {
params <- as.list(environment())
params$fmt <- 'json'
if (params$sticker == TRUE) {
base_uri <- 'http://api.giphy.com/v1/stickers/trending'
params$sticker <- NULL
} else if (params$sticker == FALSE) {
base_uri <- 'http://api.giphy.com/v1/gifs/trending'
params$sticker <- NULL
}
giphy_response <- httr::content(httr::GET(base_uri, query = params), as = "text", encoding = 'UTF-8')
giphy_list <- jsonlite::fromJSON(giphy_response)
if(giphy_list$meta$status %in% c(400, 401, 403)) {
stop(paste0('giphy returned an error: ', giphy_list$meta$msg))
}
giphy_out <- giphy_list$data
attr(giphy_out, 'meta') <- giphy_list$meta
attr(giphy_out, 'pagination') <- giphy_list$pagination
class(giphy_out) <- c('giphy', 'data.frame')
return(giphy_out)
}
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