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request.R
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request.R
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#' HTTP Request Handling
#'
#' This class wraps all functionality related to extracting information from a
#' http request. Much of the functionality is inspired by the Request class in
#' Express.js, so [the documentation](https://expressjs.com/en/4x/api.html#req)
#' for this will complement this document. As `reqres` is build on top of the
#' [Rook specifications](https://github.com/jeffreyhorner/Rook/blob/a5e45f751/README.md)
#' the `Request` object is initialized from a Rook-compliant object. This will
#' often be the request object provided by the `httpuv` framework. While it
#' shouldn't be needed, the original Rook object is always accessible and can be
#' modified, though any modifications will not propagate to derived values in
#' the `Request` object (e.g. changing the `HTTP_HOST` element of the Rook
#' object will not change the `host` field of the `Request` object). Because of
#' this, direct manipulation of the Rook object is generally discouraged.
#'
#' @usage NULL
#' @format NULL
#'
#' @section Initialization:
#' A new 'Request'-object is initialized using the \code{new()} method on the
#' generator:
#'
#' \strong{Usage}
#' \tabular{l}{
#' \code{req <- Request$new(rook, trust = FALSE)}
#' }
#'
#' \strong{Arguments}
#' \tabular{lll}{
#' \code{rook} \tab \tab The rook request that the new object should wrap\cr
#' \code{trust} \tab \tab Is this request trusted blindly. If `TRUE` `X-Forwarded-*` headers will be returned when querying host, ip, and protocol
#' }
#'
#' @section Fields:
#' The following fields are accessible in a `Request` object:
#'
#' \describe{
#' \item{`trust`}{A logical indicating whether the request is trusted. *Mutable*}
#' \item{`method`}{A string indicating the request method (in lower case, e.g.
#' 'get', 'put', etc.). *Immutable*}
#' \item{`body`}{An object holding the body of the request. This is an empty
#' string by default and needs to be populated using the `set_body()` method
#' (this is often done using a body parser that accesses the Rook$input
#' stream). *Immutable*}
#' \item{`cookies`}{Access a named list of all cookies in the request. These
#' have been URI decoded. *Immutable*}
#' \item{`headers`}{Access a named list of all headers in the request. In order
#' to follow R variable naming standards `-` have been substituted with `_`.
#' Use the `get_header()` method to lookup based on the correct header name.
#' *Immutable*}
#' \item{`host`}{Return the domain of the server given by the "Host" header if
#' `trust == FALSE`. If `trust == true` returns the `X-Forwarded-Host` instead.}
#' \item{`ip`}{Returns the remote address of the request if `trust == FALSE`.
#' if `trust == TRUE` it will instead return the first value of the
#' `X-Forwarded-For` header. *Immutable*}
#' \item{`ips`}{If `trust == TRUE` it will return the full list of ips in the
#' `X-Forwarded-For` header. If `trust == FALSE` it will return an empty
#' vector. *Immutable*}
#' \item{`protocol`}{Returns the protocol (e.g. 'http') used for the request.
#' If `trust == TRUE` it will use the value of the `X-Forwarded-Proto` header.
#' *Immutable*}
#' \item{`root`}{The mount point of the application receiving this request. Can
#' be empty if the application is mounted on the server root. *Immutable*}
#' \item{`path`}{The part of the url following the root. Defines the local
#' target of the request (independent of where it is mounted). *Immutable*}
#' \item{`url`}{The full URL of the request. *Immutable*}
#' \item{`query`}{The query string of the request (anything following "?" in
#' the URL) parsed into a named list. The query has been url decoded and "+"
#' has been substituted with space. Multiple queries are expected to be
#' separated by either "&" or "|". *Immutable*}
#' \item{`querystring`}{The unparsed query string of the request, including
#' "?". If no query string exists it will be `""` rather than `"?"`}
#' \item{`xhr`}{A logical indicating whether the `X-Requested-With` header
#' equals `XMLHttpRequest` thus indicating that the request was performed using
#' a JavaScript library such as jQuery. *Immutable*}
#' \item{`secure`}{A logical indicating whether the request was performed using
#' a secure connection, i.e. `protocol == 'https'`. *Immutable*}
#' \item{`origin`}{The original object used to create the `Request` object. As
#' `reqres` currently only works with rook this will always return the original
#' rook object. *Immutable*, though the content of the rook object itself might
#' be manipulated as it is an environment.}
#' \item{`response`}{If a `Response` object has been created for this request
#' it is accessible through this field. *Immutable*}
#' }
#'
#' @section Methods:
#' The following methods are available in a `Request` object:
#'
#' \describe{
#' \item{`set_body(content)`}{Sets the content of the request body. This method
#' should mainly be used in concert with a body parser that reads the
#' `rook$input` stream}
#' \item{`set_cookies(cookies)`}{Sets the cookies of the request. The cookies
#' are automatically parsed and populated, so this method is mainly available
#' to facilitate cookie signing and encryption}
#' \item{`get_header(name)`}{Get the header of the specified name.}
#' \item{`accepts(types)`}{Given a vector of response content types it returns
#' the preferred one based on the `Accept` header.}
#' \item{`accepts_charsets(charsets)`}{Given a vector of possible character
#' encodings it returns the preferred one based on the `Accept-Charset`
#' header.}
#' \item{`accepts_encoding(encoding)`}{Given a vector of possible content
#' encodings (usually compression algorithms) it selects the preferred one
#' based on the `Accept-Encoding` header. If there is no match it will return
#' `"identity"` signaling no compression.}
#' \item{`accepts_language(language)`}{Given a vector of possible content
#' languages it selects the best one based on the `Accept-Language` header.}
#' \item{`is(type)`}{Queries whether the body of the request is in a given
#' format by looking at the `Content-Type` header. Used for selecting the best
#' parsing method.}
#' \item{`respond()`}{Creates a new `Response` object from the request}
#' \item{`parse(..., autofail = TRUE)`}{Based on provided parsers it selects
#' the appropriate one by looking at the `Content-Type` header and assigns the
#' result to the request body. A parser is a function accepting a raw vector,
#' and a named list of additional directives,
#' and returns an R object of any kind (if the parser knows the input to be
#' plain text, simply wrap it in [rawToChar()]). If the body is compressed, it
#' will be decompressed based on the `Content-Encoding` header prior to passing
#' it on to the parser. See [parsers] for a list of pre-supplied parsers.
#' Parsers are either supplied in a named list or as named arguments to the
#' parse method. The names should correspond to mime types or known file
#' extensions. If `autofail = TRUE` the response will be set with the correct
#' error code if parsing fails. `parse()` returns `TRUE` if parsing was
#' successful and `FALSE` if not}
#' \item{`parse_raw(autofail = TRUE)`}{This is a simpler version of the
#' `parse()` method. It will attempt to decompress the body and set the `body`
#' field to the resulting raw vector. It is then up to the server to decide how
#' to handle the payload. It returns `TRUE` if successful and `FALSE`
#' otherwise.}
#' \item{`as_message()`}{Prints a HTTP representation of the request to the
#' output stream.}
#' }
#'
#' @seealso [`Response`] for handling http responses
#'
#' @importFrom R6 R6Class
#' @importFrom assertthat assert_that is.flag has_attr is.error
#' @importFrom stringi stri_match_first_regex stri_trim_both stri_split_fixed stri_split_regex
#' @importFrom urltools url_decode
#' @importFrom brotli brotli_decompress
#' @importFrom utils modifyList
#'
#' @export
#'
#' @examples
#' fake_rook <- fiery::fake_request(
#' 'http://example.com/test?id=34632&question=who+is+hadley',
#' content = 'This is an elaborate ruse',
#' headers = list(
#' Accept = 'application/json; text/*',
#' Content_Type = 'text/plain'
#' )
#' )
#'
#' req <- Request$new(fake_rook)
#'
#' # Get full URL
#' req$url
#'
#' # Get list of query parameters
#' req$query
#'
#' # Test if content is text
#' req$is('txt')
#'
#' # Perform content negotiation for the response
#' req$accepts(c('html', 'json', 'txt'))
#'
#' # Cleaning up connections
#' rm(fake_rook, req)
#' gc()
#'
Request <- R6Class('Request',
public = list(
initialize = function(rook, trust = FALSE) {
self$trust <- trust
private$ORIGIN <- rook
private$METHOD <- tolower(rook$REQUEST_METHOD)
private$HEADERS <- private$get_headers(rook)
if (is.null(rook$HTTP_HOST)) {
private$HOST <- paste(rook$SERVER_NAME, rook$SERVER_PORT, sep = ':')
} else {
private$HOST <- rook$HTTP_HOST
}
private$PROTOCOL <- rook$rook.url_scheme
private$ROOT <- rook$SCRIPT_NAME
private$PATH <- rook$PATH_INFO
private$QUERYSTRING <- rook$QUERY_STRING
if (private$QUERYSTRING != '') {
private$QUERYSTRING <- paste0('?', sub('^\\?', '', private$QUERYSTRING))
}
private$IP <- rook$REMOTE_ADDR
private$QUERY <- private$parse_query(private$QUERYSTRING)
private$COOKIES <- private$parse_cookies()
},
print = function(...) {
cat('A HTTP request\n')
cat('==============\n')
cat('Trusted: ', if (self$trust) 'Yes' else 'No', '\n', sep = '')
cat(' Method: ', self$method, '\n', sep = '')
cat(' URL: ', self$url, '\n', sep = '')
invisible(self)
},
set_body = function(content) {
private$BODY <- content
invisible(self)
},
set_cookies = function(cookies) {
private$COOKIES <- cookies
invisible(self)
},
accepts = function(types) {
accept <- private$format_mimes(self$headers$Accept)
if (is.null(accept)) return(types[1])
full_types <- private$format_types(types)
ind <- private$get_format_spec(full_types, accept)
if (is.null(ind)) return(NULL)
types[ind]
},
accepts_charsets = function(charsets) {
accept <- private$format_charsets(self$headers$Accept_Charset)
if (is.null(accept)) return(charsets[1])
ind <- private$get_charset_spec(tolower(charsets), accept)
if (is.null(ind)) return(NULL)
charsets[ind]
},
accepts_encoding = function(encoding) {
acc_enc <- self$get_header('Accept-Encoding')
if (is.null(acc_enc)) acc_enc <- 'identity'
accept <- private$format_encodings(acc_enc)
ind <- private$get_encoding_spec(tolower(encoding), accept)
if (is.null(ind)) return('identity')
encoding[ind]
},
accepts_language = function(language) {
accept <- private$format_languages(self$headers$Accept_Language)
if (is.null(accept)) return(language[1])
ind <- private$get_language_spec(tolower(language), accept)
if (is.null(ind)) return(NULL)
language[ind]
},
is = function(type) {
accept <- self$get_header('Content-Type')
if (is.null(accept)) return(NULL)
accept <- trimws(strsplit(accept, ';')[[1]])[1]
content <- private$format_mimes(accept)
full_type <- private$format_types(type)
if (nrow(full_type) == 0) return(FALSE)
!is.null(private$get_format_spec(full_type, content))
},
get_header = function(name) {
self$headers[[gsub('-', '_', name)]]
},
respond = function() {
if (is.null(self$response)) {
Response$new(self)
} else {
self$response
}
},
parse = function(..., autofail = TRUE) {
if (!private$has_body()) return(TRUE)
parsers <- list(...)
if (is.list(..1)) {
first_parsers <- names(parsers)[-1]
parsers <- modifyList(..1, list(...)[-1])
first_parsers <- names(parsers) %in% first_parsers
parsers <- c(parsers[first_parsers], parsers[!first_parsers])
}
assert_that(has_attr(parsers, 'names'))
type <- self$get_header('Content-Type')
if (is.null(type)) return(FALSE)
directives <- trimws(strsplit(type, ';')[[1]])[-1]
directives <- strsplit(directives, '=')
directives <- structure(
lapply(directives, `[`, 2),
names = lapply(directives, `[`, 1)
)
success <- FALSE
for (i in names(parsers)) {
if (self$is(i)) {
content <- private$get_body()
content <- try(private$unpack(content))
if (is.error(content)) {
if (autofail) self$response$status_with_text(400L)
return(FALSE)
}
content <- try(parsers[[i]](content, directives))
if (!is.error(content)) {
private$BODY <- content
success <- TRUE
break
}
}
}
if (!success && autofail && !is.null(self$response)) {
self$response$status_with_text(415L)
}
success
},
parse_raw = function(autofail = TRUE) {
content <- private$get_body()
content <- try(private$unpack(content))
if (is.error(content)) {
if (autofail) self$response$status_with_text(400L)
return(FALSE)
}
private$BODY <- content
TRUE
},
as_message = function() {
cat(toupper(self$method), ' ', self$root, self$path, self$querystring, ' ', toupper(self$protocol), '/1.1\n', sep = '')
if (is.null(self$get_header('Host'))) {
cat('Host: ', self$host, '\n', sep = '')
}
headers <- split_headers(self$headers)
cat_headers(headers$request)
cat_headers(headers$entity)
body <- rawToChar(private$get_body())
cat('\n')
if (body == '') {
cat('<No Body>\n')
} else {
body <- gsub('\n', '\\\\n', body)
body <- gsub('\t', '\\\\t', body)
cat(substr(body, 1, 77), if (nchar(body) > 77) '...\n' else '\n', sep = '')
}
}
),
active = list(
trust = function(value) {
if (missing(value)) return(private$TRUST)
assert_that(is.flag(value))
private$TRUST <- value
},
method = function() {
private$METHOD
},
body = function() {
private$BODY
},
cookies = function() {
private$COOKIES
},
headers = function() {
private$HEADERS
},
host = function() {
if (self$trust && !is.null(self$headers$X_Forwarded_Host)) {
self$headers$X_Forwarded_Host
} else {
private$HOST
}
},
ip = function() {
if (self$trust && !is.null(self$headers$X_Forwarded_For)) {
self$headers$X_Forwarded_For[1]
} else {
private$IP
}
},
ips = function() {
if (self$trust && !is.null(self$headers$X_Forwarded_For)) {
self$headers$X_Forwarded_For
} else {
character(0)
}
},
protocol = function() {
if (self$trust && !is.null(self$headers$X_Forwarded_Proto)) {
self$headers$X_Forwarded_Proto
} else {
private$PROTOCOL
}
},
root = function() {
private$ROOT
},
path = function() {
private$PATH
},
url = function() {
paste0(self$protocol, '://',
self$host,
self$root,
self$path,
self$querystring)
},
query = function() {
private$QUERY
},
querystring = function() {
private$QUERYSTRING
},
xhr = function() {
xhr <- self$get_header('X-Requested-With')
!is.null(xhr) && xhr == 'XMLHttpRequest'
},
secure = function() {
self$protocol == 'https'
},
origin = function() {
private$ORIGIN
},
response = function(res) {
if (missing(res)) return(private$RESPONSE)
if (!is.null(private$RESPONSE)) {
stop('Response can only be assigned once', call. = FALSE)
}
stopifnot(inherits(res, 'Response'))
if (!identical(self, res$request)) {
stop('response can only be set to an object responding to this request', call. = FALSE)
}
private$RESPONSE <- res
}
),
private = list(
TRUST = FALSE,
ORIGIN = NULL,
METHOD = NULL,
HOST = NULL,
PROTOCOL = NULL,
ROOT = NULL,
PATH = NULL,
QUERYSTRING = NULL,
IP = NULL,
QUERY = NULL,
BODY = NULL,
HEADERS = NULL,
COOKIES = NULL,
RESPONSE = NULL,
parse_cookies = function() {
if (is.null(self$headers$Cookie)) return(list())
cookies <- stri_trim_both(stri_split_regex(self$headers$Cookie, ";(?=\\s*[a-zA-Z0-9!#$%&'()*+-.\\/:<>?@\\[\\]^_`{|}~]{1,})")[[1]])
cookies <- unlist(stri_split_fixed(cookies, '=', n = 2))
structure(
as.list(url_decode(cookies[c(FALSE, TRUE)])),
names = cookies[c(TRUE, FALSE)]
)
},
parse_query = function(query) {
if (query == '') return(list())
query <- url_decode(query)
query <- sub('^\\?', '', query)
query <- gsub('\\+', ' ', query)
query <- strsplit(unlist(strsplit(query, '&|;')), '=')
ans <- list()
for (i in query) {
ans[[i[1]]] <- append(ans[[i[1]]], i[2])
}
lapply(ans, type.convert, as.is = TRUE)
},
get_headers = function(rook) {
vars <- ls(rook)
headers <- vars[grepl('^HTTP_', vars)]
ans <- lapply(headers, function(head) {
strsplit(rook[[head]], split = ',\\s?')[[1]]
})
names(ans) <- gsub("(^|_)([[:alpha:]])", "\\1\\U\\2",
tolower(sub('^HTTP_', '', headers)),
perl = TRUE)
ans
},
format_mimes = function(type) {
if (is.null(type) || length(type) == 0) return(NULL)
type <- stri_match_first_regex(tolower(type), '^\\s*([^\\s\\/;]+)\\/([^;\\s]+)\\s*(?:;(.*))?$')
type <- as.data.frame(type, stringsAsFactors = FALSE)
names(type) <- c('full', 'main', 'sub', 'q')
type$q <- get_quality(type$q)
type
},
format_charsets = function(charsets) {
if (is.null(charsets) || length(charsets) == 0) return(NULL)
charsets <- stri_match_first_regex(tolower(charsets), '^\\s*([^\\s;]+)\\s*(?:;(.*))?$')
charsets <- as.data.frame(charsets, stringsAsFactors = FALSE)
names(charsets) <- c('full', 'main', 'q')
charsets$q <- get_quality(charsets$q)
charsets
},
format_encodings = function(encodings) {
if (is.null(encodings) || length(encodings) == 0) return(NULL)
encodings <- stri_match_first_regex(tolower(encodings), '^\\s*([^\\s;]+)\\s*(?:;(.*))?$')
encodings <- as.data.frame(encodings, stringsAsFactors = FALSE)
names(encodings) <- c('full', 'main', 'q')
encodings$q <- get_quality(encodings$q)
if (!'identity' %in% encodings$main) {
encodings <- rbind(
encodings,
data.frame(full = 'identity;q=0', main = 'identity', q = min(encodings$q), stringsAsFactors = FALSE)
)
}
encodings
},
format_languages = function(lang) {
if (is.null(lang) || length(lang) == 0) return(NULL)
lang <- stri_match_first_regex(tolower(lang), '^\\s*([^\\s\\-;]+)(?:-([^\\s;]+))?\\s*(?:;(.*))?$')
lang <- as.data.frame(lang, stringsAsFactors = FALSE)
names(lang) <- c('full', 'main', 'sub', 'q')
lang$q <- get_quality(lang$q)
lang$complete <- paste0(lang$main, ifelse(is.na(lang$sub), '', paste0('-', lang$sub)))
lang
},
format_types = function(formats) {
ext <- !grepl('/', formats)
format_ind <- rep(NA_integer_, length(formats))
formats[ext] <- sub('^[.]', '', formats[ext])
format_ind[ext] <- mimes_ext$index[match(formats[ext], mimes_ext$ext)]
format_ind[!ext] <- match(formats[!ext], mimes$name)
mimes[na.omit(format_ind), ]
},
get_format_spec = function(format, accepts) {
f_split <- strsplit(format$name, '/')
spec <- do.call(rbind, lapply(f_split, function(n) {
spec <- ifelse(n[1] == accepts$main, 4, ifelse(accepts$main == '*', 0, NA))
spec <- spec + ifelse(n[2] == accepts$sub, 2, ifelse(accepts$sub == '*', 0, NA))
win <- order(spec, accepts$q, -seq_along(spec), decreasing = TRUE)[1]
if (is.na(spec[win])) {
c(NA, NA)
} else {
c(spec[win], win)
}
}))
if (all(is.na(spec[, 1]))) return(NULL)
order(accepts$q[spec[,2]], spec[,1], -spec[,2], -seq_along(f_split), decreasing = TRUE)[1]
},
get_charset_spec = function(charset, accepts) {
spec <- do.call(rbind, lapply(charset, function(n) {
spec <- ifelse(n == accepts$main, 1, ifelse(accepts$main == '*', 0, NA))
win <- order(spec, accepts$q, -seq_along(spec), decreasing = TRUE)[1]
if (is.na(spec[win])) {
c(NA, NA)
} else {
c(spec[win], win)
}
}))
if (all(is.na(spec[, 1]))) return(NULL)
order(accepts$q[spec[,2]], spec[,1], -spec[,2], -seq_along(charset), decreasing = TRUE)[1]
},
get_encoding_spec = function(encoding, accepts) {
spec <- do.call(rbind, lapply(encoding, function(n) {
spec <- ifelse(n == accepts$main, 1, ifelse(accepts$main == '*', 0, NA))
win <- order(spec, accepts$q, -seq_along(spec), decreasing = TRUE)[1]
if (is.na(spec[win])) {
c(NA, NA)
} else {
c(spec[win], win)
}
}))
if (all(is.na(spec[, 1]))) return(NULL)
order(accepts$q[spec[,2]], spec[,1], -spec[,2], -seq_along(encoding), decreasing = TRUE)[1]
},
get_language_spec = function(lang, accepts) {
l_split <- strsplit(lang, '-')
spec <- do.call(rbind, lapply(seq_along(lang), function(i) {
spec <- ifelse(lang[i] == accepts$complete, 4, NA)
spec <- ifelse(is.na(spec) & lang[i] == accepts$main, 2, NA)
spec <- ifelse(is.na(spec) & l_split[[i]][1] == accepts$complete, 1, NA)
spec <- ifelse(is.na(spec) & accepts$complete == '*', 0, NA)
win <- order(spec, accepts$q, -seq_along(spec), decreasing = TRUE)[1]
if (is.na(spec[win])) {
c(NA, NA)
} else {
c(spec[win], win)
}
}))
if (all(is.na(spec[, 1]))) return(NULL)
order(accepts$q[spec[,2]], spec[,1], -spec[,2], -seq_along(lang), decreasing = TRUE)[1]
},
unpack = function(raw) {
compression <- self$get_header('Content-Encoding')
if (is.null(compression)) return(raw)
compression <- rev(trimws(strsplit(compression, ',')[[1]]))
Reduce(function(l, r) {
switch(
r,
identity = l,
br = brotli_decompress(l),
gzip =,
"x-gzip" = {
con <- gzcon(rawConnection(l))
l <- readBin(con, raw(), length(l))
close(con)
l
},
deflate = memDecompress(l, type = 'gzip'),
stop('Unsupported compression', call. = FALSE)
)
}, x = compression, init = raw)
},
has_body = function() {
first <- private$ORIGIN$rook.input$read(1)
private$ORIGIN$rook.input$rewind()
length(first) != 0
},
get_body = function() {
body <- private$ORIGIN$rook.input$read()
private$ORIGIN$rook.input$rewind()
body
}
)
)
#' @rdname Request
#'
#' @usage as.Request(x, ...)
#' @param x An object coercible to a `Request`.
#' @param ... Parameters passed on to `Request$new()`
#' @return A `Request` object (for `as.Request()`) or a logical indicating whether
#' the object is a `Request` (for `is.Request()`)
#' @export
as.Request <- function(x, ...) {
UseMethod('as.Request')
}
#' @export
as.Request.Request <- function(x, ...) x
#' @export
as.Request.environment <- function(x, ...) {
if (is.null(x[['rook.version']])) {
stop('Must be a Rook object', call. = FALSE)
}
Request$new(x, ...)
}
#' @rdname Request
#' @usage is.Request(x)
#' @export
is.Request <- function(x) inherits(x, 'Request')
#' @importFrom stringi stri_extract_first_regex
get_quality <- function(q) {
q <- stri_extract_first_regex(q, 'q=([0-9]*[.])?[0-9]+')
q <- as.numeric(sub('q=', '', q))
q[is.na(q)] <- 1
q
}