Tools to Work with the 'Splash' JavaScript Rendering Service in R
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#' Return the HTML of the javascript-rendered page.
#' Similar to `rvest::read_html`.
#' @md
#' @param splash_obj Object created by a call to [splash]
#' @param url The URL to render (required)
#' @param base_url The base url to render the page with.
#' @param timeout A timeout (in seconds) for the render (defaults to 30).
#' @param resource_timeout A timeout (in seconds) for individual network requests.
#' @param wait Time (in seconds) to wait for updates after page is loaded (defaults to 0).
#' @param proxy Proxy profile name or proxy URL.
#' @param js Javascript profile name.
#' @param js_src JavaScript code to be executed in page context.
#' @param filters Comma-separated list of request filter names.
#' @param allowed_domains Comma-separated list of allowed domain names. If present, Splash won’t load anything neither from domains not in this list nor from subdomains of domains not in this list.
#' @param allowed_content_types Comma-separated list of allowed content types. If present, Splash will abort any request if the response’s content type doesn’t match any of the content types in this list. Wildcards are supported.
#' @param forbidden_content_types Comma-separated list of forbidden content types. If present, Splash will abort any request if the response’s content type matches any of the content types in this list. Wildcards are supported.
#' @param viewport View width and height (in pixels) of the browser viewport to render the web page. Format is “<width>x<height>”, e.g. 800x600. Default value is 1024x768.
#' @param images Whether to download images.
#' @param headers HTTP headers to set for the first outgoing request.
#' @param body Body of HTTP POST request to be sent if method is POST.
#' @param http_method HTTP method of outgoing Splash request.
#' @param save_args A list of argument names to put in cache.
#' @param load_args Parameter values to load from cache
#' @param raw_html if `TRUE` then return a character vector vs an XML document. Only valid for `render_html`
#' @return An XML document. Note that this is processed by [xml2::read_html] so it will not be
#' the pristine, raw, rendered HTML from the site. Use `raw_html=TRUE` if you do not want it
#' to be processed first by `xml2`. If you choose `raw_html=TRUE` you'll get back a
#' character vector.
#' @references [Splash docs](
#' @export
render_html <- function(splash_obj, url, base_url, timeout=30, resource_timeout, wait=0,
proxy, js, js_src, filters, allowed_domains, allowed_content_types,
forbidden_content_types, viewport="1024x768", images, headers, body,
http_method, save_args, load_args, raw_html=FALSE) {
params <- list(url=url, timeout=timeout, wait=wait, viewport=viewport)
if (!missing(base_url)) params$base_url <- base_url
if (!missing(resource_timeout)) params$resource_timeout <- resource_timeout
if (!missing(proxy)) proxy$base_url <- proxy
if (!missing(js)) params$js <- js
if (!missing(js_src)) params$js_src <- js_src
if (!missing(filters)) params$filters <- filters
if (!missing(allowed_domains)) params$allowed_domains <- allowed_domains
if (!missing(allowed_content_types)) params$allowed_content_types <- allowed_content_types
if (!missing(forbidden_content_types)) params$forbidden_content_types <- forbidden_content_types
if (!missing(images)) params$images <- images
if (!missing(headers)) params$headers <- headers
if (!missing(body)) params$body <- body
if (!missing(http_method)) params$http_method <- http_method
if (!missing(save_args)) params$save_args <- save_args
if (!missing(load_args)) params$load_args <- load_args
res <- httr::GET(splash_url(splash_obj), path="render.html", encode="json", query=params)
out <- httr::content(res, as="text", encoding="UTF-8")
if (!raw_html) out <- xml2::read_html(out)