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# HTTP transport using the RCurl package. DEPRECATED; exists only for backwards compatibility (it
# was the default transport for many years). In a future release of rsconnect, the RCurl transport
# will be removed entirely, and the "rcurl" option will be interpreted as "libcurl".
httpRCurl <- function(protocol,
host,
port,
method,
path,
headers,
contentType = NULL,
contentFile = NULL,
certificate = NULL,
timeout = NULL) {
if (!is.null(contentFile) && is.null(contentType))
stop("You must specify a contentType for the specified file")
# add prefix to port if necessary
if (!is.null(port) && nzchar(port))
port <- paste(":", port, sep = "")
# build url
url <- paste(protocol, "://", host, port, path, sep = "")
# read file in binary mode
if (!is.null(contentFile)) {
fileLength <- file.info(contentFile)$size
fileContents <- readBin(contentFile, what = "raw", n = fileLength)
headers$`Content-Type` <- contentType
}
# establish options
options <- RCurl::curlOptions(url)
options$useragent <- userAgent()
# overlay user-supplied options
userOptions <- getOption("rsconnect.rcurl.options")
if (is.list(userOptions)) {
for (option in names(userOptions)) {
options[option] <- userOptions[option]
}
}
if (isTRUE(getOption("rsconnect.check.certificate", TRUE))) {
options$ssl.verifypeer <- TRUE
# apply certificate information if present
if (!is.null(certificate))
options$cainfo <- certificate
} else {
# don't verify peer (less secure but tolerant to self-signed cert issues)
options$ssl.verifypeer <- FALSE
}
headerGatherer <- RCurl::basicHeaderGatherer()
options$headerfunction <- headerGatherer$update
# the text processing done by .mapUnicode has the unfortunate side effect
# of turning escaped backslashes into ordinary backslashes but leaving
# ordinary backslashes alone, which can create malformed JSON.
textGatherer <- RCurl::basicTextGatherer(.mapUnicode = FALSE)
# use timeout if supplied
if (!is.null(timeout)) {
options$timeout <- timeout
}
# verbose if requested
if (httpVerbose())
options$verbose <- TRUE
# add extra headers
headers <- appendCookieHeaders(
list(protocol = protocol, host = host, port = port, path = path), headers)
extraHeaders <- as.character(headers)
names(extraHeaders) <- names(headers)
options$httpheader <- extraHeaders
# make the request
time <- system.time(gcFirst = FALSE, tryCatch({
if (!is.null(contentFile)) {
RCurl::curlPerform(url = url,
.opts = options,
customrequest = method,
readfunction = fileContents,
infilesize = fileLength,
writefunction = textGatherer$update,
upload = TRUE)
} else if (method == "DELETE") {
RCurl::curlPerform(url = url,
.opts = options,
customrequest = method)
} else {
if (identical(method, "GET")) {
RCurl::getURL(url,
.opts = options,
write = textGatherer)
} else {
RCurl::curlPerform(url = url,
.opts = options,
customrequest = method,
writefunction = textGatherer$update)
}
}},
error = function(e, ...) {
# ignore errors resulting from timeout or user abort
if (identical(e$message, "Callback aborted") ||
identical(e$message, "transfer closed with outstanding read data remaining"))
return(NULL)
# bubble remaining errors through
else
stop(e)
}))
httpTrace(method, path, time)
# get list of HTTP response headers
headers <- headerGatherer$value()
# deduce status. we do this *before* lowercase conversion, as it is possible
# for both "Status" and "status" headers to exist
status <- 200
statuses <- headers[names(headers) == "status"] # find status header
statuses <- statuses[grepl("^\\d+$", statuses)] # ensure fully numeric
if (length(statuses) > 0) {
# we found a numeric status header
status <- as.integer(statuses[[1]])
}
# lowercase all header names for normalization; HTTP/2 uses lowercase headers
# by default but they're typically capitalized in HTTP/1
names(headers) <- tolower(names(headers))
if ("location" %in% names(headers))
location <- headers[["location"]]
else
location <- NULL
# presume a plain text response unless specified otherwise
contentType <- if ("content-type" %in% names(headers)) {
headers[["content-type"]]
} else {
"text/plain"
}
# emit JSON trace if requested
if (!is.null(contentFile) && httpTraceJson() &&
identical(contentType, "application/json"))
cat(paste0("<< ", rawToChar(fileContents), "\n"))
# Parse cookies from header; bear in mind that there may be multiple headers
cookieHeaders <- headers[names(headers) == "set-cookie"]
storeCookies(list(protocol = protocol, host = host, port = port, path = path), cookieHeaders)
contentValue <- textGatherer$value()
# emit JSON trace if requested
if (httpTraceJson() && identical(contentType, "application/json"))
cat(paste0(">> ", contentValue, "\n"))
list(req = list(protocol = protocol,
host = host,
port = port,
method = method,
path = path),
status = status,
location = location,
contentType = contentType,
content = contentValue)
}
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