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as_headers <- function(
x,
redact = character(),
lifespan,
error_call = caller_env()
) {
if (is.list(x)) {
new_headers(
x,
redact = redact,
lifespan = lifespan,
error_call = error_call
)
} else if (is.character(x) || is.raw(x)) {
parsed <- curl::parse_headers(x)
valid <- parsed[grepl(":", parsed, fixed = TRUE)]
halves <- parse_in_half(valid, ":")
headers <- set_names(trimws(halves$right), halves$left)
new_headers(
as.list(headers),
redact = redact,
lifespan = lifespan,
error_call = error_call
)
} else {
cli::cli_abort(
"{.arg headers} must be a list, character vector, or raw.",
call = error_call
)
}
}
new_headers <- function(
x,
redact = character(),
lifespan,
error_call = caller_env()
) {
if (!is_list(x)) {
cli::cli_abort("{.arg x} must be a list.", call = error_call)
}
if (length(x) > 0 && !is_named(x)) {
cli::cli_abort("All elements of {.arg x} must be named.", call = error_call)
}
for (i in seq_along(x)) {
if (!is.atomic(x[[i]]) && !is_weakref(x[[i]])) {
cli::cli_abort(
c(
"Each element of {.arg x} must be an atomic vector or a weakref.",
i = "{.arg x[[{i}]]} is {obj_type_friendly(x[[i]])}."
),
call = error_call
)
}
}
needs_redact <- !is_redacted(x) & (tolower(names(x)) %in% tolower(redact))
x[needs_redact] <- lapply(x[needs_redact], \(x) new_weakref(lifespan, x))
structure(x, class = "httr2_headers")
}
#' @export
print.httr2_headers <- function(x, ..., redact = TRUE) {
cli::cat_line(cli::format_inline("{.cls {class(x)}}"))
show_headers(x, redact = redact)
invisible(x)
}
show_headers <- function(x, redact = TRUE) {
if (length(x) > 0) {
vals <- lapply(headers_flatten(x, redact), format)
cli::cat_line(cli::style_bold(names(x)), ": ", vals)
}
}
#' @export
str.httr2_headers <- function(object, ..., no.list = FALSE) {
object <- unclass(headers_flatten(object))
cat(" <httr2_headers>\n")
utils::str(object, ..., no.list = TRUE)
}
#' @export
`[.httr2_headers` <- function(x, i, ...) {
if (is.character(i)) {
i <- match(tolower(i), tolower(names(x)))
}
new_headers(NextMethod())
}
#' @export
`[[.httr2_headers` <- function(x, i) {
if (is.character(i)) {
i <- match(tolower(i), tolower(names(x)))
}
NextMethod()
}
#' @export
"$.httr2_headers" <- function(x, name) {
i <- match(tolower(name), tolower(names(x)))
x[[i]]
}
is_redacted <- function(x) {
map_lgl(x, is_weakref)
}
is_redacted_empty <- function(x) {
map_lgl(x, \(x) is_weakref(x) && is.null(wref_value(x)))
}
which_redacted <- function(x) {
names(x)[is_redacted(x)]
}
# Flatten headers object into a list suitable either for display (if redacted)
# or passing to curl (if not redacted).
headers_flatten <- function(x, redact = TRUE) {
is_redacted <- is_redacted(x)
out <- vector("list", length(x))
names(out) <- names(x)
# https://datatracker.ietf.org/doc/html/rfc7230#section-3.2.2
out[!is_redacted] <- lapply(x[!is_redacted], paste, collapse = ",")
if (redact) {
out[is_redacted] <- list(redacted_sentinel())
} else {
out[is_redacted] <- lapply(x[is_redacted], wref_value)
# also need to ensure redacted values are simple strings
out[is_redacted] <- lapply(out[is_redacted], function(x) {
if (!is.null(x)) paste(x, collapse = ",")
})
# need to strip serialized weakrefs that now yield NULL
out <- compact(out)
}
out
}
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