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response_class.R
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response_class.R
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#' @title The response of an HTTPInteraction
#' @description Custom vcr http response object
#' @export
#' @keywords internal
#' @examples \dontrun{
#' vcr_configure(dir = tempdir())
#'
#' # basic example of VcrResponse use
#' url <- "https://google.com"
#' (cli <- crul::HttpClient$new(url = url))
#' (res <- cli$get("get", query = list(q = "stuff")))
#' (x <- VcrResponse$new(res$status_http(), res$response_headers,
#' res$parse("UTF-8"), res$response_headers$status))
#' x$body
#' x$status
#' x$headers
#' x$http_version
#' x$to_hash()
#' x$from_hash(x$to_hash())
#'
#' # update content length header
#' ## example 1
#' ### content-length header present, but no change
#' url <- "https://fishbase.ropensci.org"
#' cli <- crul::HttpClient$new(url = url, headers = list(`Accept-Encoding` = '*'))
#' res <- cli$get("species/34")
#' x <- VcrResponse$new(res$status_http(), res$response_headers,
#' res$parse("UTF-8"), res$response_headers$status)
#' x$headers$`content-length`
#' x$update_content_length_header()
#' x$headers$`content-length`
#'
#' ## example 2
#' ### no content-length header b/c a transfer-encoding header is included
#' ### and no content-length header allowed if transfer-encoding header
#' ### used (via rfc7230)
#' url <- "https://google.com"
#' cli <- crul::HttpClient$new(url = url)
#' res <- cli$get()
#' x <- VcrResponse$new(res$status_http(), res$response_headers,
#' rawToChar(res$content), res$response_headers$status)
#' x$headers$`content-length` # = NULL
#' x$update_content_length_header() # no change, b/c header doesn't exist
#' x$headers$`content-length` # = NULL
#'
#' ## example 3
#' ### content-length header present, and does change
#' body <- " Hello World "
#' x <- VcrResponse$new(200, list('content-length'=nchar(body)),
#' body, "HTTP/2")
#' x$headers$`content-length` # = 13
#' x$body <- gsub("^\\s|\\s$", "", x$body)
#' x$headers$`content-length` # = 13
#' x$update_content_length_header()
#' x$headers$`content-length` # = 11
#'
#' # check if body is compressed
#' url <- "https://fishbase.ropensci.org"
#' (cli <- crul::HttpClient$new(url = url))
#' (res <- cli$get("species/3"))
#' res$response_headers
#' (x <- VcrResponse$new(res$status_http(), res$response_headers,
#' res$parse("UTF-8"), res$response_headers$status))
#' x$content_encoding()
#' x$is_compressed()
#'
#' # with disk
#' url <- "https://google.com"
#' (cli <- crul::HttpClient$new(url = url))
#' f <- tempfile()
#' (res <- cli$get("get", query = list(q = "stuff"), disk = f))
#' (x <- VcrResponse$new(res$status_http(), res$response_headers,
#' f, res$response_headers$status, disk = TRUE))
#' }
VcrResponse <- R6::R6Class(
"VcrResponse",
public = list(
#' @field status the status of the response
status = NULL,
#' @field headers the response headers
headers = NULL,
#' @field body the response body
body = NULL,
#' @field http_version the HTTP version
http_version = NULL,
#' @field opts a list
opts = NULL,
#' @field adapter_metadata Additional metadata used by a specific VCR adapter
adapter_metadata = NULL,
#' @field hash a list
hash = NULL,
#' @field disk a boolean
disk = NULL,
#' @description Create a new VcrResponse object
#' @param status the status of the response
#' @param headers the response headers
#' @param body the response body
#' @param http_version the HTTP version
#' @param opts a list
#' @param adapter_metadata Additional metadata used by a specific VCR adapter
#' @param disk boolean, is body a file on disk
#' @return A new `VcrResponse` object
initialize = function(status, headers, body, http_version, opts,
adapter_metadata = NULL, disk) {
if (!missing(status)) self$status <- status
if (!missing(headers)) self$headers <- headers
if (!missing(body)) {
if (inherits(body, "list")) {
body <- paste(names(body), body, sep = "=", collapse = ",")
}
# self$body <- if (is.character(body)) enc2utf8(body) else body
self$body <- body
}
if (!missing(http_version)) {
self$http_version <- extract_http_version(http_version)
}
if (!missing(opts)) self$opts <- opts
if (!missing(adapter_metadata)) self$adapter_metadata <- adapter_metadata
if (!missing(disk)) self$disk <- disk
},
#' @description print method for the `VcrResponse` class
#' @param x self
#' @param ... ignored
print = function(x, ...) cat("<VcrResponse> ", sep = "\n"),
#' @description Create a hash
#' @return a list
to_hash = function() {
self$hash <- list(
status = self$status,
headers = self$headers,
body =
serializable_body(self$body,
self$opts$preserve_exact_body_bytes %||% FALSE),
http_version = self$http_version,
disk = self$disk
)
return(self$hash)
},
#' @description Get a hash back to an R list
#' @param hash a list
#' @return an `VcrResponse` object
from_hash = function(hash) {
VcrResponse$new(
hash[["status"]],
hash[["headers"]],
hash[["body"]],
# body_from(hash[["body"]]),
hash[["http_version"]],
hash[["adapater_metadata"]],
hash[["disk"]]
)
},
#' @description Updates the Content-Length response header so that
#' it is accurate for the response body
#' @return no return; modifies the content length header
update_content_length_header = function() {
if (!is.null(self$get_header("content-length"))) {
len <- 0
if (length(self$body) > 0 && nchar(self$body) > 0) {
len <- as.character(nchar(self$body))
}
self$edit_header("content-length", len)
}
},
#' @description Get a header by name
#' @param key (character) header name to get
#' @return the header value (if it exists)
get_header = function(key) {
self$headers[[key]]
},
#' @description Edit a header
#' @param key (character) header name to edit
#' @param value (character) new value to assign
#' @return no return; modifies the header in place
edit_header = function(key, value = NULL) {
self$headers[[key]] <- value
},
#' @description Delete a header
#' @param key (character) header name to delete
#' @return no return; the header is deleted if it exists
delete_header = function(key) {
self$headers[key] <- NULL
},
#' @description Get the content-encoding header value
#' @return (character) the content-encoding value
content_encoding = function() {
self$get_header("content-encoding")[1]
},
#' @description Checks if the encoding is one of "gzip" or "deflate"
#' @return logical
is_compressed = function() {
self$content_encoding() %in% c("gzip", "deflate")
}
)
)
extract_http_version <- function(x) {
if (!is.character(x)) return(x)
if (grepl("HTTP/[0-9]\\.?", x)) {
strsplit(stract(x, "HTTP/[12]\\.?([0-9])?"), "/")[[1]][2] %||% ""
} else {
return(x)
}
}