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#' List B2 File Versions.
#'
#' \code{b2ListFileVersions} lists all versions of all of the files contained in
#' one bucket, within a user's account on the Backblaze B2 cloud storage
#' product.
#'
#' This function lists all versions of all of the files contained in one bucket,
#' within a user's account on the Backblaze B2 cloud storage product. Files will
#' be listed in alphabetical order by file name, and by reverse of date/time
#' uploaded for versions of files with the same name. Further details regarding
#' this API call are available here:
#'
#' \url{https://www.backblaze.com/b2/docs/b2_list_file_versions.html}
#'
#' \code{bucketId} is mandatory and must be user defined. \code{startFileName},
#' \code{startFileId} and \code{maxFileCount} are optional and may be defined by the
#' user if so desired.
#'
#' @param bucketId The unique identifier of the bucket containing the files to
#' be listed. Bucket IDs may be obtained through the
#' \code{b2ListBuckets}function in this package.
#' @param startFileName The name of the file from which the list will start. If
#' there are no files with this name, the first version of the file with the
#' first name after the given name will be the first in the list. This is an
#' optional parameter. Not defining this parameter will result in the list
#' starting from the newest file first. File names may be obtained through the
#' \code{b2ListFileNames} function in this package.
#' @param startFileId The first file ID to return. This is an optional
#' parameter. \code{startFileName} must also be provided if \code{startFileId}
#' is specified.
#' @param maxFileCount An integer defining the maximum number of file names to
#' return. This is an optional parameter and defaults to 100. The maximum
#' acceptable value is 1000.
#' @return If successful a list will be returned containing \code{files},
#' \code{nextFileName} and \code{nextFileId} for files within the specified
#' bucket. If greater than the maximum number of specified files in
#' \code{maxFileCount} exists, further file versions may be obtained beginning
#' with \code{nextFileName}, as the \code{startFileName} parameter value. This
#' may be done either alone or in combination with \code{nextFileId}, as
#' \code{startFileId}. If successful a data frame will be returned, nested
#' within \code{files}, containing \code{fileId}, \code{fileName},
#' \code{action}, \code{size} and \code{uploadTimestamp} for all file versions
#' within the specified bucket.
#'
#' @examples
#' \dontrun{
#' b2ListFileVersions(bucketId = "aUniqueBucketId",
#' startFileName = "yourFileName.png",
#' startFileId = "yourFileId"
#' maxFileCount = 500)
#' }
#'
#' @export
b2ListFileVersions <-
function(bucketId, startFileName = "", startFileId = "", maxFileCount = 100) {
# Read Account Authorisation file
accountAuthorization <- NULL
accountAuthorization <- readRDS("accountAuthorization.rds")
# Function options from input, make a dataframe
bucketId <- as.data.frame(bucketId, stringsAsFactors = FALSE)
startFileName <-
as.data.frame(startFileName, stringsAsFactors = FALSE)
startFileId <-
as.data.frame(startFileId, stringsAsFactors = FALSE)
maxFileCount <-
as.data.frame(maxFileCount, stringsAsFactors = FALSE)
# Bind function option data frames together
vars <- cbind(bucketId, startFileName, startFileId, maxFileCount)
# Remove empty values
vars <- vars[, colSums(vars != "") != 0]
# API call
b2Return <-
httr::POST(
paste(
accountAuthorization$apiUrl,"/b2api/v1/b2_list_file_versions", sep = ""
), body = jsonlite::toJSON(jsonlite::unbox(vars), pretty = TRUE), httr::add_headers(
'Authorization' = as.character(accountAuthorization$authorizationToken)
)
)
# Check for bad authorisation and sent message
if (httr::status_code(b2Return) != "200") {
badReturn <- jsonlite::fromJSON(httr::content(b2Return,type = "text"))
stop(
"\nSomething went wrong. Please check the function options to ensure valid values. \n",
"\nStatus Code: ", badReturn$code, "\nMessage: ", badReturn$message
)
} else {
# Output as dataframe
jsonlite::fromJSON(httr::content(b2Return, type = "text"))
}
}
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