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#' @title Read data access groups from a REDCap project
#'
#' @description This function reads all available data access groups from
#' REDCap an returns them as a [base::data.frame()].
#'
#' @param redcap_uri The URI (uniform resource identifier) of the REDCap
#' project. Required.
#' @param token The user-specific string that serves as the password for a
#' project. Required.
#' @param http_response_encoding The encoding value passed to
#' [httr::content()]. Defaults to 'UTF-8'.
#' @param locale a [readr::locale()] object to specify preferences like
#' number, date, and time formats. This object is passed to
#' [`readr::read_csv()`]. Defaults to [readr::default_locale()].
#' @param verbose A boolean value indicating if `message`s should be printed
#' to the R console during the operation. The verbose output might contain
#' sensitive information (*e.g.* PHI), so turn this off if the output might
#' be visible somewhere public. Optional.
#' @param config_options A list of options to pass to `POST` method in the
#' `httr` package.
#'
#' @return Currently, a list is returned with the following elements:
#' * `data`: An R [base::data.frame()] of all data access groups of the project.
#' * `success`: A boolean value indicating if the operation was apparently
#' successful.
#' * `status_codes`: A collection of
#' [http status codes](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes),
#' separated by semicolons. There is one code for each batch attempted.
#' * `outcome_messages`: A collection of human readable strings indicating the
#' operations' semicolons. There is one code for each batch attempted. In an
#' unsuccessful operation, it should contain diagnostic information.
#' * `elapsed_seconds`: The duration of the function.
#'
#'
#' @author Jonathan M. Mang
#' @references The official documentation can be found on the 'API Help Page'
#' and 'API Examples' pages on the REDCap wiki (*i.e.*,
#' https://community.projectredcap.org/articles/456/api-documentation.html
#' and
#' https://community.projectredcap.org/articles/462/api-examples.html).
#' If you do not have an account for the wiki, please ask your campus REDCap
#' administrator to send you the static material.
#'
#' @examples
#' \dontrun{
#' uri <- "https://bbmc.ouhsc.edu/redcap/api/"
#' token <- "9A81268476645C4E5F03428B8AC3AA7B"
#' REDCapR::redcap_dag_read(redcap_uri=uri, token=token)$data
#' }
#' @export
redcap_dag_read <- function(
redcap_uri,
token,
http_response_encoding = "UTF-8",
locale = readr::default_locale(),
verbose = TRUE,
config_options = NULL
) {
checkmate::assert_character(redcap_uri , any.missing=FALSE, len=1, pattern="^.{1,}$")
checkmate::assert_character(token , any.missing=FALSE, len=1, pattern="^.{1,}$")
checkmate::assert_character(http_response_encoding , any.missing=FALSE, len=1)
checkmate::assert_class( locale, "locale" , null.ok = FALSE)
checkmate::assert_logical( verbose , any.missing=FALSE, len=1, null.ok=TRUE)
checkmate::assert_list( config_options , any.missing=TRUE , null.ok=TRUE)
token <- sanitize_token(token)
verbose <- verbose_prepare(verbose)
post_body <- list(
token = token,
content = "dag",
format = "csv"
)
# This is the important line that communicates with the REDCap server.
kernel <- kernel_api(
redcap_uri = redcap_uri,
post_body = post_body,
config_options = config_options,
encoding = http_response_encoding
)
if (kernel$success) {
try(
# Convert the raw text to a dataset.
ds <-
readr::read_csv(
file = I(kernel$raw_text),
locale = locale,
show_col_types = FALSE
) %>%
as.data.frame(),
# Don't print the warning in the try block. Print it below,
# where it's under the control of the caller.
silent = TRUE
)
if (exists("ds") & inherits(ds, "data.frame")) {
outcome_message <- sprintf(
"%s data access groups were read from REDCap in %0.1f seconds. The http status code was %i.",
format( nrow(ds), big.mark = ",", scientific = FALSE, trim = TRUE),
kernel$elapsed_seconds,
kernel$status_code
)
# ds <- dplyr::mutate_if(
# ds,
# is.character,
# function(x) dplyr::coalesce(x, "") #Replace NAs with blanks
# )
#
# ds <- dplyr::mutate_if(
# ds,
# is.character,
# function( x ) gsub("\r\n", "\n", x, perl=TRUE)
# )
# ds <- dplyr::mutate_if(
# ds,
# function( x) inherits(x, "Date"),
# as.character
# )
#
# ds <- base::as.data.frame(ds)
# If an operation is successful, the `raw_text` is no longer returned to
# save RAM. The content is not really necessary with httr's status
# message exposed.
kernel$raw_text <- ""
} else { # ds doesn't exist as a data.frame.
# nocov start
# Override the 'success' determination from the http status code.
# and return an empty data.frame.
kernel$success <- FALSE
ds <- data.frame()
outcome_message <- sprintf(
"The REDCap read failed. The http status code was %i. The 'raw_text' returned was '%s'.",
kernel$status_code,
kernel$raw_text
)
# nocov end
}
} else { # kernel fails
ds <- data.frame() #Return an empty data.frame
outcome_message <- if (any(grepl(kernel$regex_empty, kernel$raw_text))) {
"The REDCapR read/export operation was not successful. The returned dataset was empty." # nocov
} else {
sprintf(
"The REDCapR read/export operation was not successful. The error message was:\n%s",
kernel$raw_text
)
}
}
if (verbose)
message(outcome_message)
list(
data = ds,
success = kernel$success,
status_code = kernel$status_code,
outcome_message = outcome_message,
elapsed_seconds = kernel$elapsed_seconds,
raw_text = kernel$raw_text
)
}
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