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#' @title SES HTTP Requests
#' @description Low-level SES POST function
#' @param query A list containing query string parameters
#' @param body A list of query-like parameters to be passed as a form-encoded message body.
#' @param region A character string containing an AWS region. If missing, the default \dQuote{us-east-1} is used.
#' @param key A character string containing an AWS Access Key ID. The default is pulled from environment variable \dQuote{AWS_ACCESS_KEY_ID}.
#' @param secret A character string containing an AWS Secret Access Key. The default is pulled from environment variable \dQuote{AWS_SECRET_ACCESS_KEY}.
#' @param session_token Optionally, a character string containing an AWS temporary Session Token. If missing, defaults to value stored in environment variable \dQuote{AWS_SESSION_TOKEN}.
#' @param \dots Additional arguments passed to \code{\link[httr]{POST}}.
#' @import httr
#' @importFrom aws.signature signature_v4_auth
#' @importFrom utils URLencode
#' @importFrom jsonlite fromJSON
#' @export
sesPOST <- function(query = list(),
body = NULL,
region = Sys.getenv("AWS_DEFAULT_REGION","us-east-1"),
key = Sys.getenv("AWS_ACCESS_KEY_ID"),
secret = Sys.getenv("AWS_SECRET_ACCESS_KEY"),
session_token = Sys.getenv("AWS_SESSION_TOKEN"),
...) {
uri <- paste0("https://email.",region,".amazonaws.com")
d_timestamp <- format(Sys.time(), "%Y%m%dT%H%M%SZ", tz = "UTC")
body_to_sign <- if (is.null(body)) {
""
} else {
paste0(names(body), "=", sapply(unname(body), utils::URLencode, reserved = TRUE), collapse = "&")
}
Sig <- signature_v4_auth(
datetime = d_timestamp,
region = region,
service = "email",
verb = "POST",
action = "/",
query_args = query,
canonical_headers = list(host = paste0("email.",region,".amazonaws.com"),
`x-amz-date` = d_timestamp),
request_body = body_to_sign,
key = key,
secret = secret,
session_token = session_token)
headers <- list()
headers[["x-amz-date"]] <- d_timestamp
headers[["x-amz-content-sha256"]] <- Sig$BodyHash
if (!is.null(session_token) && session_token != "") {
headers[["x-amz-security-token"]] <- session_token
}
headers[["Authorization"]] <- Sig[["SignatureHeader"]]
H <- do.call(add_headers, headers)
if (length(query)) {
if (!is.null(body)) {
r <- POST(uri, H, query = query, body = body, encode = "form", ...)
} else {
r <- POST(uri, H, query = query, ...)
}
} else {
if (!is.null(body)) {
r <- POST(uri, H, body = body, encode = "form", ...)
} else {
r <- POST(uri, H, ...)
}
}
if (http_status(r)$category == "Client error") {
x <- try(fromJSON(content(r, "text", encoding = "UTF-8"))$Error, silent = TRUE)
warn_for_status(r)
h <- headers(r)
out <- structure(x, headers = h, class = "aws_error")
attr(out, "request_canonical") <- Sig$CanonicalRequest
attr(out, "request_string_to_sign") <- Sig$StringToSign
attr(out, "request_signature") <- Sig$SignatureHeader
} else {
out <- try(fromJSON(content(r, "text", encoding = "UTF-8")), silent = TRUE)
if (inherits(out, "try-error")) {
out <- structure(content(r, "text", encoding = "UTF-8"), class = "unknown")
}
}
return(out)
}
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