diff --git a/DESCRIPTION b/DESCRIPTION index 1cc26a5..978db4f 100644 --- a/DESCRIPTION +++ b/DESCRIPTION @@ -1,6 +1,6 @@ Package: htmlunit Type: Package -Title: htmlunit title goes here otherwise CRAN checks fail +Title: Tools to Scrape Dynamic Web Content via the 'HtmlUnit' Java Library Version: 0.1.0 Date: 2018-12-16 Authors@R: c( @@ -8,17 +8,29 @@ Authors@R: c( comment = c(ORCID = "0000-0001-5670-2640")) ) Maintainer: Bob Rudis -Description: A good description goes here otherwise CRAN checks fail. +Description: 'HtmlUnit' () is a "'GUI'-Less + browser for 'Java' programs". It models 'HTML' documents and provides an 'API' + that allows one to invoke pages, fill out forms, click links and more just like + one does in a "normal" browser. The library has fairly good and constantly + improving 'JavaScript' support and is able to work even with quite complex 'AJAX' + libraries, simulating 'Chrome', 'Firefox' or 'Internet Explorer' depending on + the configuration used. It is typically used for testing purposes or to retrieve + information from web sites. Tools are provided to work with this library + at a higher level than provided by the exposed 'Java' libraries in the + 'htmlunitjars' package. URL: https://gitlab.com/hrbrmstr/htmlunit BugReports: https://gitlab.com/hrbrmstr/htmlunit/issues Encoding: UTF-8 -License: AGPL +License: Apache License 2.0 | file LICENSE Suggests: testthat, covr Depends: - R (>= 3.2.0) -Imports: - httr, - jsonlite + R (>= 3.2.0), + rJava, + htmlunitjars, + rvest RoxygenNote: 6.1.1 +Remotes: hrbrmstr/htmlunitjars +Imports: + magrittr diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..df0bb94 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/NAMESPACE b/NAMESPACE index 5b4b9ae..9a3ad6c 100644 --- a/NAMESPACE +++ b/NAMESPACE @@ -1,4 +1,8 @@ # Generated by roxygen2: do not edit by hand -import(httr) -importFrom(jsonlite,fromJSON) +export("%>%") +export(hu_read_html) +import(htmlunitjars) +import(rJava) +import(rvest) +importFrom(magrittr,"%>%") diff --git a/R/htmlunit-package.R b/R/htmlunit-package.R index 6ea4cb4..198959c 100644 --- a/R/htmlunit-package.R +++ b/R/htmlunit-package.R @@ -1,12 +1,24 @@ -#' ... -#' +#' Tools to Scrape Dynamic Web Content via the 'HtmlUnit' Java Library +#' +#' `HtmlUnit` () is _a "'GUI'-Less +#' browser for 'Java' programs". It models 'HTML' documents and provides an 'API' +#' that allows one to invoke pages, fill out forms, click links and more just like +#' one does in a "normal" browser. The library has fairly good and constantly +#' improving 'JavaScript' support and is able to work even with quite complex 'AJAX' +#' libraries, simulating 'Chrome', 'Firefox' or 'Internet Explorer' depending on +#' the configuration used. It is typically used for testing purposes or to retrieve +#' information from web sites._ +#' +#' Tools are provided to work with this library at a higher level than provided by +#' the exposed 'Java' libraries in the [`htmlunitjars`](https://gitlab.com/hrbrmstr/htmlunitjars) +#' package. +#' #' - URL: #' - BugReports: -#' +#' #' @md #' @name htmlunit #' @docType package #' @author Bob Rudis (bob@@rud.is) -#' @import httr -#' @importFrom jsonlite fromJSON +#' @import rvest htmlunitjars rJava NULL diff --git a/R/hu-read-html.R b/R/hu-read-html.R new file mode 100644 index 0000000..7b9de12 --- /dev/null +++ b/R/hu-read-html.R @@ -0,0 +1,90 @@ +#' Read HTML from a URL with Browser Emulation & in a JavaScript Context +#' +#' Use a JavaScript-enabled browser context to read and render HTML from a URL. +#' +#' For the code in the examples, this is the site that is being scraped: +#' +#' \if{html}{ +#' \figure{test-url-table.png}{options: width="100\%" alt="Figure: test-url-table.png"} +#' } +#' +#' \if{latex}{ +#' \figure{test-url-table.png}{options: width=10cm} +#' } +#' +#' Note that it has a table of values but it is rendered via JavaScript. +#' +#' @param url URL to retrieve +#' @param emulate browser to emulate; one of "`best`", "`chrome`", "`firefox`", "`ie`" +#' @param ret what to return; if `html_document` (the default) then the HTML created +#' by the `HtmlUnit` emulated browser context is passed to [xml2::read_html()] +#' and an `xml2` `html_document`/`xml_document` is returned. Note that this causes +#' further HTML processing by `xml2`/`libxml2` so is not _exactly_ what +#' `HtmlUnit` generated. If you want the HTML code (text) without any further +#' processing then use `text` as the value. +#' @param js_delay time (ms) to let loaded javascript to execute; default is 2 seconds (2000 ms) +#' @param timeout overall timeout (ms); `0` == infinite wait (not recommended); note: the +#' timeout is used twice: first in making the socket connection, +#' second for data retrieval. If the time is critical you must +#' allow for twice the time specified here. Default 30s (30000 ms) +#' @param ignore_ssl_errors Should SSL/TLS errors be ignored. The default (`TRUE`) is +#' a current hack due to how `HtmlUnit` seems to handle virtual hosted sites +#' with multiple vhosts and multiple certificates. You can try it with `FALSE` +#' initially and revert back to `TRUE` if you encounter issues. +#' @param enable_dnt Enable the "Do Not Track" header. Default: `FALSE`. +#' @param download_images Download images as the page is loaded? Since this +#' function is a high-level wrapper designed to do a read of HTML, +#' it is recommended that you leave this the default `FALSE` to save +#' time/bandwidth. +#' @param options options to pass to [xml2::read_html()] if `ret` == `html_document`. +#' @return an `xml2` `html_document`/`xml_document` if `ret` == `html_document` else +#' the HTML document text generated by `HtmlUnit`. +#' @export +#' @examples \dontrun{ +#' test_url <- "https://hrbrmstr.github.io/htmlunitjars/index.html" +#' hu_read_html(test_url) +#' } +hu_read_html <- function(url, + emulate = c("best", "chrome", "firefox", "ie"), + ret = c("html_document", "text"), + js_delay = 2000L, + timeout = 30000L, + ignore_ssl_errors = TRUE, + enable_dnt = FALSE, + download_images = FALSE, + options = c("RECOVER", "NOERROR", "NOBLANKS")) { + + emulate <- match.arg(emulate, c("best", "chrome", "firefox", "ie")) + ret <- match.arg(ret, c("html_document", "text")) + + available_browsers <- J("com.gargoylesoftware.htmlunit.BrowserVersion") + + switch( + emulate, + best = available_browsers$BEST_SUPPORTED, + chrome = available_browsers$CHROME, + firefox = available_browsers$FIREFOX_60, + ie = available_browsers$INTERNET_EXPLORER + ) -> use_browser + + wc <- new(J("com.gargoylesoftware.htmlunit.WebClient"), use_browser) + + res <- wc$waitForBackgroundJavaScriptStartingBefore(.jlong(as.integer(js_delay))) + + wc_opts <- wc$getOptions() + wc_opts$setThrowExceptionOnFailingStatusCode(FALSE) + wc_opts$setThrowExceptionOnScriptError(FALSE) + wc_opts$setTimeout(as.integer(timeout)) + + if (ignore_ssl_errors) wc_opts$setUseInsecureSSL(TRUE) + if (enable_dnt) wc_opts$setDoNotTrackEnabled(TRUE) + if (download_images) wc_opts$setDownloadImages(TRUE) + + pg <- wc$getPage(test_url) + + if (ret == "html_document") return(xml2::read_html(pg$asXml(), options = options)) + + return(pg$asText()) + +} + diff --git a/R/utils-pipe.R b/R/utils-pipe.R new file mode 100644 index 0000000..fb8c818 --- /dev/null +++ b/R/utils-pipe.R @@ -0,0 +1,11 @@ +#' Pipe operator +#' +#' See \code{magrittr::\link[magrittr]{\%>\%}} for details. +#' +#' @name %>% +#' @rdname pipe +#' @keywords internal +#' @export +#' @importFrom magrittr %>% +#' @usage lhs \%>\% rhs +NULL diff --git a/README.Rmd b/README.Rmd index 624ed06..1573d0f 100644 --- a/README.Rmd +++ b/README.Rmd @@ -1,18 +1,38 @@ --- output: rmarkdown::github_document --- - +```{r include=FALSE} +knitr::opts_chunk$set(message=FALSE, warning=FALSE) +``` # htmlunit +Tools to Scrape Dynamic Web Content via the 'HtmlUnit' Java Library + ## Description +`HtmlUnit` () is _a "'GUI'-Less +browser for 'Java' programs". It models 'HTML' documents and provides an 'API' +that allows one to invoke pages, fill out forms, click links and more just like +one does in a "normal" browser. The library has fairly good and constantly +improving 'JavaScript' support and is able to work even with quite complex 'AJAX' +libraries, simulating 'Chrome', 'Firefox' or 'Internet Explorer' depending on +the configuration used. It is typically used for testing purposes or to retrieve +information from web sites._ + +Tools are provided to work with this library at a higher level than provided by +the exposed 'Java' libraries in the [`htmlunitjars`](https://gitlab.com/hrbrmstr/htmlunitjars) +package. + ## What's Inside The Tin The following functions are implemented: +- `hu_read_html`: Read HTML from a URL with Browser Emua;tion & in a JavaScript Context + ## Installation ```{r eval=FALSE} +devtools::install_github("hrbrmstr/htmlunitjars") devtools::install_github("hrbrmstr/htmlunit") ``` @@ -30,3 +50,26 @@ packageVersion("htmlunit") ``` +Something `xml2::read_html()` cannot do, read the table from : + +![](man/figures/test-url-table.png) + +```{r} +test_url <- "https://hrbrmstr.github.io/htmlunitjars/index.html" + +pg <- xml2::read_html(test_url) + +html_table(pg) +``` + +☹️ + +But, `hu_read_html()` can! + +```{r} +pg <- hu_read_html(test_url) + +html_table(pg) +``` + +All without needing a separate Selenium or Splash server instance. \ No newline at end of file diff --git a/README.md b/README.md index 83292ba..a6b7b6b 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,78 @@ + # htmlunit +Tools to Scrape Dynamic Web Content via the ‘HtmlUnit’ Java Library + +## Description + +`HtmlUnit` () is *a “‘GUI’-Less +browser for ‘Java’ programs”. It models ‘HTML’ documents and provides an +‘API’ that allows one to invoke pages, fill out forms, click links and +more just like one does in a “normal” browser. The library has fairly +good and constantly improving ‘JavaScript’ support and is able to work +even with quite complex ‘AJAX’ libraries, simulating ‘Chrome’, ‘Firefox’ +or ‘Internet Explorer’ depending on the configuration used. It is +typically used for testing purposes or to retrieve information from web +sites.* + +Tools are provided to work with this library at a higher level than +provided by the exposed ‘Java’ libraries in the +[`htmlunitjars`](https://gitlab.com/hrbrmstr/htmlunitjars) package. + +## What’s Inside The Tin + +The following functions are implemented: + + - `hu_read_html`: Read HTML from a URL with Browser Emua;tion & in a + JavaScript Context + +## Installation + +``` r +devtools::install_github("hrbrmstr/htmlunitjars") +devtools::install_github("hrbrmstr/htmlunit") +``` + +## Usage + +``` r +library(htmlunit) + +# current verison +packageVersion("htmlunit") +``` + + ## [1] '0.1.0' + +Something `xml2::read_html()` cannot do, read the table from +: + +![](man/figures/test-url-table.png) + +``` r +test_url <- "https://hrbrmstr.github.io/htmlunitjars/index.html" + +pg <- xml2::read_html(test_url) + +html_table(pg) +``` + + ## list() + +☹️ + +But, `hu_read_html()` can\! + +``` r +pg <- hu_read_html(test_url) + +html_table(pg) +``` + + ## [[1]] + ## X1 X2 + ## 1 One Two + ## 2 Three Four + ## 3 Five Six + +All without needing a separate Selenium or Splash server instance. diff --git a/man/figures/test-url-table.png b/man/figures/test-url-table.png new file mode 100644 index 0000000..e9dbe9e Binary files /dev/null and b/man/figures/test-url-table.png differ diff --git a/man/htmlunit.Rd b/man/htmlunit.Rd index 64c05ea..ccf75e4 100644 --- a/man/htmlunit.Rd +++ b/man/htmlunit.Rd @@ -4,8 +4,21 @@ \name{htmlunit} \alias{htmlunit} \alias{htmlunit-package} -\title{...} +\title{Tools to Scrape Dynamic Web Content via the 'HtmlUnit' Java Library} \description{ +\code{HtmlUnit} (\url{http://htmlunit.sourceforge.net/}) is \emph{a "'GUI'-Less +browser for 'Java' programs". It models 'HTML' documents and provides an 'API' +that allows one to invoke pages, fill out forms, click links and more just like +one does in a "normal" browser. The library has fairly good and constantly +improving 'JavaScript' support and is able to work even with quite complex 'AJAX' +libraries, simulating 'Chrome', 'Firefox' or 'Internet Explorer' depending on +the configuration used. It is typically used for testing purposes or to retrieve +information from web sites.} +} +\details{ +Tools are provided to work with this library at a higher level than provided by +the exposed 'Java' libraries in the \href{https://gitlab.com/hrbrmstr/htmlunitjars}{htmlunitjars} +package. \itemize{ \item URL: \url{https://gitlab.com/hrbrmstr/htmlunit} \item BugReports: \url{https://gitlab.com/hrbrmstr/htmlunit/issues} diff --git a/man/hu_read_html.Rd b/man/hu_read_html.Rd new file mode 100644 index 0000000..fe5cbe5 --- /dev/null +++ b/man/hu_read_html.Rd @@ -0,0 +1,71 @@ +% Generated by roxygen2: do not edit by hand +% Please edit documentation in R/hu-read-html.R +\name{hu_read_html} +\alias{hu_read_html} +\title{Read HTML from a URL with Browser Emulation & in a JavaScript Context} +\usage{ +hu_read_html(url, emulate = c("best", "chrome", "firefox", "ie"), + ret = c("html_document", "text"), js_delay = 2000L, + timeout = 30000L, ignore_ssl_errors = TRUE, enable_dnt = FALSE, + download_images = FALSE, options = c("RECOVER", "NOERROR", + "NOBLANKS")) +} +\arguments{ +\item{url}{URL to retrieve} + +\item{emulate}{browser to emulate; one of "`best`", "`chrome`", "`firefox`", "`ie`"} + +\item{ret}{what to return; if `html_document` (the default) then the HTML created +by the `HtmlUnit` emulated browser context is passed to [xml2::read_html()] +and an `xml2` `html_document`/`xml_document` is returned. Note that this causes +further HTML processing by `xml2`/`libxml2` so is not _exactly_ what +`HtmlUnit` generated. If you want the HTML code (text) without any further +processing then use `text` as the value.} + +\item{js_delay}{time (ms) to let loaded javascript to execute; default is 2 seconds (2000 ms)} + +\item{timeout}{overall timeout (ms); `0` == infinite wait (not recommended); note: the +timeout is used twice: first in making the socket connection, +second for data retrieval. If the time is critical you must +allow for twice the time specified here. Default 30s (30000 ms)} + +\item{ignore_ssl_errors}{Should SSL/TLS errors be ignored. The default (`TRUE`) is +a current hack due to how `HtmlUnit` seems to handle virtual hosted sites +with multiple vhosts and multiple certificates. You can try it with `FALSE` +initially and revert back to `TRUE` if you encounter issues.} + +\item{enable_dnt}{Enable the "Do Not Track" header. Default: `FALSE`.} + +\item{download_images}{Download images as the page is loaded? Since this +function is a high-level wrapper designed to do a read of HTML, +it is recommended that you leave this the default `FALSE` to save +time/bandwidth.} + +\item{options}{options to pass to [xml2::read_html()] if `ret` == `html_document`.} +} +\value{ +an `xml2` `html_document`/`xml_document` if `ret` == `html_document` else + the HTML document text generated by `HtmlUnit`. +} +\description{ +Use a JavaScript-enabled browser context to read and render HTML from a URL. +} +\details{ +For the code in the examples, this is the site that is being scraped: + +\if{html}{ +\figure{test-url-table.png}{options: width="100\%" alt="Figure: test-url-table.png"} +} + +\if{latex}{ +\figure{test-url-table.png}{options: width=10cm} +} + +Note that it has a table of values but it is rendered via JavaScript. +} +\examples{ +\dontrun{ +test_url <- "https://hrbrmstr.github.io/htmlunitjars/index.html" +hu_read_html(test_url) +} +} diff --git a/man/pipe.Rd b/man/pipe.Rd new file mode 100644 index 0000000..b7daf6a --- /dev/null +++ b/man/pipe.Rd @@ -0,0 +1,12 @@ +% Generated by roxygen2: do not edit by hand +% Please edit documentation in R/utils-pipe.R +\name{\%>\%} +\alias{\%>\%} +\title{Pipe operator} +\usage{ +lhs \%>\% rhs +} +\description{ +See \code{magrittr::\link[magrittr]{\%>\%}} for details. +} +\keyword{internal}