You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

66 lines
2.1 KiB

#' State and Territorial Epidemiologists Reports of Geographic Spread of Influenza
#'
#' @md
#' @param years a vector of years to retrieve data for (i.e. `2014` for CDC
#' flu season 2014-2015). CDC has data for this API going back to 2003
#' and up until the current, active flu season.
#' Default value (`NULL`) means retrieve **all** years. NOTE: if you
#' happen to specify a 2-digit season value (i.e. `57` == 2017-2018)
#' the function is smart enough to retrieve by season ID vs convert that
#' to a year.
#' @export
#' @examples \dontrun{
#' gs <- geographic_spread()
#' }
geographic_spread <- function(years=NULL) {
meta <- jsonlite::fromJSON("https://gis.cdc.gov/grasp/Flu8/GetPhase08InitApp?appVersion=Public")
available_seasons <- sort(meta$seasons$seasonid)
if (is.null(years)) { # ALL YEARS
years <- available_seasons
} else { # specified years or seasons or a mix
years <- as.numeric(years)
years <- ifelse(years > 1996, years - 1960, years)
years <- sort(unique(years))
years <- years[years %in% available_seasons]
if (length(years) == 0) {
years <- rev(sort(meta$seasons$seasonid))[1]
curr_season_descr <- meta$seasons[meta$seasons$seasonid == years, "description"]
message(sprintf("No valid years specified, defaulting to this flu season => ID: %s [%s]",
years, curr_season_descr))
}
}
httr::POST(
url = "https://gis.cdc.gov/grasp/Flu8/PostPhase08DownloadData",
httr::user_agent(.cdcfluview_ua),
httr::add_headers(
Origin = "https://gis.cdc.gov",
Accept = "application/json, text/plain, */*",
Referer = "https://gis.cdc.gov/grasp/fluview/FluView8.html"
),
encode = "json",
body = list(
AppVersion = "Public",
SeasonIDs = paste0(years, collapse=",")
),
5 years ago
# httr::verbose(),
httr::timeout(.httr_timeout)
) -> res
httr::stop_for_status(res)
res <- httr::content(res, as="parsed", flatten=TRUE)
suppressMessages(suppressWarnings(xdf <- dplyr::bind_rows(res$datadownload)))
xdf$weekend <- as.Date(xdf$weekend, format="%B-%d-%Y")
xdf
}