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#' Gets the value of the given system attribute.
#'
#' @param labbcat.url URL to the LaBB-CAT instance
#' @param attribute Name of the attribute.
#' @return The value of the given attribute.
#'
#' \code{\link{getLayers}}
#' @examples
#' \dontrun{
#' ## Get the name of the LaBB-CAT instance
#' title <- getSystemAttribute("https://labbcat.canterbury.ac.nz/demo/", "title")
#' }
#'
getSystemAttribute <- function(labbcat.url, attribute) {
resp <- http.get(labbcat.url, paste("api/systemattributes", attribute, sep="/"))
if (is.null(resp)) return()
resp.content <- httr::content(resp, as="text", encoding="UTF-8")
if (httr::status_code(resp) != 200) { # 200 = OK
if (httr::status_code(resp) == 400) { # 400 = Bad request
# the content should be valid JSON with informative errors
resp.json <- jsonlite::fromJSON(resp.content)
for (error in resp.json$errors) print(paste("ERROR:", error))
} else {
print(paste("ERROR:", httr::http_status(resp)$message))
print(resp.content)
}
return()
}
resp.json <- jsonlite::fromJSON(resp.content)
for (error in resp.json$errors) print(error)
return(resp.json$model$value)
}
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