monolith/src/html.rs
2020-08-01 02:35:07 -04:00

1368 lines
61 KiB
Rust

use base64;
use chrono::prelude::*;
use html5ever::interface::QualName;
use html5ever::parse_document;
use html5ever::rcdom::{Handle, NodeData, RcDom};
use html5ever::serialize::{serialize, SerializeOpts};
use html5ever::tendril::{format_tendril, Tendril, TendrilSink};
use html5ever::tree_builder::{Attribute, TreeSink};
use html5ever::{local_name, namespace_url, ns};
use reqwest::blocking::Client;
use reqwest::Url;
use sha2::{Digest, Sha256, Sha384, Sha512};
use std::collections::HashMap;
use std::default::Default;
use crate::css::embed_css;
use crate::js::attr_is_event_handler;
use crate::opts::Options;
use crate::url::{
data_to_data_url, get_url_fragment, is_http_url, resolve_url, url_has_protocol,
url_with_fragment,
};
use crate::utils::retrieve_asset;
struct SrcSetItem<'a> {
path: &'a str,
descriptor: &'a str,
}
const ICON_VALUES: &[&str] = &["icon", "shortcut icon"];
pub fn add_base_tag(document: &Handle, url: String) -> RcDom {
let mut buf: Vec<u8> = Vec::new();
serialize(&mut buf, document, SerializeOpts::default())
.expect("unable to serialize DOM into buffer");
let result = String::from_utf8(buf).unwrap();
let mut dom = html_to_dom(&result);
let doc = dom.get_document();
let html = get_child_node_by_name(&doc, "html");
let head = get_child_node_by_name(&html, "head");
let favicon_node = dom.create_element(
QualName::new(None, ns!(), local_name!("base")),
vec![Attribute {
name: QualName::new(None, ns!(), local_name!("href")),
value: format_tendril!("{}", url),
}],
Default::default(),
);
// Insert BASE tag into HEAD
head.children.borrow_mut().push(favicon_node.clone());
dom
}
pub fn add_favicon(document: &Handle, favicon_data_url: String) -> RcDom {
let mut buf: Vec<u8> = Vec::new();
serialize(&mut buf, document, SerializeOpts::default())
.expect("unable to serialize DOM into buffer");
let result = String::from_utf8(buf).unwrap();
let mut dom = html_to_dom(&result);
let doc = dom.get_document();
let html = get_child_node_by_name(&doc, "html");
let head = get_child_node_by_name(&html, "head");
let favicon_node = dom.create_element(
QualName::new(None, ns!(), local_name!("link")),
vec![
Attribute {
name: QualName::new(None, ns!(), local_name!("rel")),
value: format_tendril!("icon"),
},
Attribute {
name: QualName::new(None, ns!(), local_name!("href")),
value: format_tendril!("{}", favicon_data_url),
},
],
Default::default(),
);
// Insert favicon LINK tag into HEAD
head.children.borrow_mut().push(favicon_node.clone());
dom
}
pub fn csp(options: &Options) -> String {
let mut string_list = vec![];
if options.isolate {
string_list.push("default-src 'unsafe-inline' data:;");
}
if options.no_css {
string_list.push("style-src 'none';");
}
if options.no_fonts {
string_list.push("font-src 'none';");
}
if options.no_frames {
string_list.push("frame-src 'none';");
string_list.push("child-src 'none';");
}
if options.no_js {
string_list.push("script-src 'none';");
}
if options.no_images {
// Note: data: is needed for transparent pixels
string_list.push("img-src data:;");
}
string_list.join(" ")
}
pub fn embed_srcset(
cache: &mut HashMap<String, Vec<u8>>,
client: &Client,
parent_url: &str,
srcset: &str,
options: &Options,
depth: u32,
) -> String {
let mut array: Vec<SrcSetItem> = vec![];
let srcset_items: Vec<&str> = srcset.split(',').collect();
for srcset_item in srcset_items {
let parts: Vec<&str> = srcset_item.trim().split_whitespace().collect();
let path = parts[0].trim();
let descriptor = if parts.len() > 1 { parts[1].trim() } else { "" };
let srcset_real_item = SrcSetItem { path, descriptor };
array.push(srcset_real_item);
}
let mut result: String = str!();
let mut i: usize = array.len();
for part in array {
if options.no_images {
result.push_str(empty_image!());
} else {
let image_full_url = resolve_url(&parent_url, part.path).unwrap_or_default();
let image_url_fragment = get_url_fragment(image_full_url.clone());
match retrieve_asset(
cache,
client,
&parent_url,
&image_full_url,
options.silent,
depth + 1,
) {
Ok((image_data, image_final_url, image_media_type)) => {
let image_data_url =
data_to_data_url(&image_media_type, &image_data, &image_final_url);
// Append retreved asset as a data URL
let assembled_url: String =
url_with_fragment(image_data_url.as_str(), image_url_fragment.as_str());
result.push_str(assembled_url.as_ref());
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(image_full_url.clone()) {
let assembled_url: String =
url_with_fragment(image_full_url.as_str(), image_url_fragment.as_str());
result.push_str(assembled_url.as_ref());
} else {
// Avoid breaking the structure in case if not an HTTP(S) URL
result.push_str(empty_image!());
}
}
}
}
if !part.descriptor.is_empty() {
result.push_str(" ");
result.push_str(part.descriptor);
}
if i > 1 {
result.push_str(", ");
}
i -= 1;
}
result
}
fn get_child_node_by_name(handle: &Handle, node_name: &str) -> Handle {
let children = handle.children.borrow();
let matching_children = children.iter().find(|child| match child.data {
NodeData::Element { ref name, .. } => &*name.local == node_name,
_ => false,
});
match matching_children {
Some(node) => node.clone(),
_ => handle.clone(),
}
}
pub fn get_node_name(node: &Handle) -> Option<&'_ str> {
match &node.data {
NodeData::Element { ref name, .. } => Some(name.local.as_ref()),
_ => None,
}
}
pub fn get_parent_node(node: &Handle) -> Handle {
let parent = node.parent.take().clone();
parent.and_then(|node| node.upgrade()).unwrap()
}
pub fn has_proper_integrity(data: &[u8], integrity: &str) -> bool {
if integrity.starts_with("sha256-") {
let mut hasher = Sha256::new();
hasher.update(data);
base64::encode(hasher.finalize()) == integrity[7..]
} else if integrity.starts_with("sha384-") {
let mut hasher = Sha384::new();
hasher.update(data);
base64::encode(hasher.finalize()) == integrity[7..]
} else if integrity.starts_with("sha512-") {
let mut hasher = Sha512::new();
hasher.update(data);
base64::encode(hasher.finalize()) == integrity[7..]
} else {
false
}
}
pub fn has_base_tag(handle: &Handle) -> bool {
let mut found_base_tag: bool = false;
match handle.data {
NodeData::Document => {
// Dig deeper
for child in handle.children.borrow().iter() {
if has_base_tag(child) {
found_base_tag = true;
break;
}
}
}
NodeData::Element {
ref name,
ref attrs,
..
} => {
match name.local.as_ref() {
"base" => {
let attrs_mut = &mut attrs.borrow_mut();
for attr in attrs_mut.iter_mut() {
if &attr.name.local == "href" {
if !attr.value.trim().is_empty() {
found_base_tag = true;
break;
}
}
}
}
_ => {}
}
if !found_base_tag {
// Dig deeper
for child in handle.children.borrow().iter() {
if has_base_tag(child) {
found_base_tag = true;
break;
}
}
}
}
_ => {}
}
found_base_tag
}
pub fn has_favicon(handle: &Handle) -> bool {
let mut found_favicon: bool = false;
match handle.data {
NodeData::Document => {
// Dig deeper
for child in handle.children.borrow().iter() {
if has_favicon(child) {
found_favicon = true;
break;
}
}
}
NodeData::Element {
ref name,
ref attrs,
..
} => {
match name.local.as_ref() {
"link" => {
let attrs_mut = &mut attrs.borrow_mut();
for attr in attrs_mut.iter_mut() {
if &attr.name.local == "rel" {
if is_icon(attr.value.trim()) {
found_favicon = true;
break;
}
}
}
}
_ => {}
}
if !found_favicon {
// Dig deeper
for child in handle.children.borrow().iter() {
if has_favicon(child) {
found_favicon = true;
break;
}
}
}
}
_ => {}
}
found_favicon
}
pub fn html_to_dom(data: &str) -> RcDom {
parse_document(RcDom::default(), Default::default())
.from_utf8()
.read_from(&mut data.as_bytes())
.unwrap()
}
pub fn is_icon(attr_value: &str) -> bool {
ICON_VALUES.contains(&attr_value.to_lowercase().as_str())
}
pub fn metadata_tag(url: &str) -> String {
let timestamp = Utc::now().to_rfc3339_opts(SecondsFormat::Secs, true);
// Safe to unwrap (we just put this through an HTTP request)
match Url::parse(url) {
Ok(mut clean_url) => {
clean_url.set_fragment(None);
// Prevent credentials from getting into metadata
if is_http_url(url) {
// Only HTTP(S) URLs may feature credentials
clean_url.set_username("").unwrap();
clean_url.set_password(None).unwrap();
}
if is_http_url(url) {
format!(
"<!-- Saved from {} at {} using {} v{} -->",
&clean_url,
timestamp,
env!("CARGO_PKG_NAME"),
env!("CARGO_PKG_VERSION"),
)
} else {
format!(
"<!-- Saved from local source at {} using {} v{} -->",
timestamp,
env!("CARGO_PKG_NAME"),
env!("CARGO_PKG_VERSION"),
)
}
}
Err(_) => str!(),
}
}
pub fn stringify_document(handle: &Handle, options: &Options) -> String {
let mut buf: Vec<u8> = Vec::new();
serialize(&mut buf, handle, SerializeOpts::default())
.expect("unable to serialize DOM into buffer");
let mut result = String::from_utf8(buf).unwrap();
// We can't make it isolate the page right away since it may have no HEAD element,
// ergo we have to serialize, parse the DOM again, insert the CSP meta tag, and then
// finally serialize and return the resulting string
if options.isolate
|| options.no_css
|| options.no_fonts
|| options.no_frames
|| options.no_js
|| options.no_images
{
// Take care of CSP
let mut buf: Vec<u8> = Vec::new();
let mut dom = html_to_dom(&result);
let doc = dom.get_document();
let html = get_child_node_by_name(&doc, "html");
let head = get_child_node_by_name(&html, "head");
let csp_content: String = csp(options);
let meta = dom.create_element(
QualName::new(None, ns!(), local_name!("meta")),
vec![
Attribute {
name: QualName::new(None, ns!(), local_name!("http-equiv")),
value: format_tendril!("Content-Security-Policy"),
},
Attribute {
name: QualName::new(None, ns!(), local_name!("content")),
value: format_tendril!("{}", csp_content),
},
],
Default::default(),
);
// Note: the CSP meta-tag has to be prepended, never appended,
// since there already may be one defined in the document,
// and browsers don't allow re-defining them (for obvious reasons)
head.children.borrow_mut().reverse();
head.children.borrow_mut().push(meta.clone());
head.children.borrow_mut().reverse();
serialize(&mut buf, &doc, SerializeOpts::default())
.expect("unable to serialize DOM into buffer");
result = String::from_utf8(buf).unwrap();
}
result
}
pub fn walk_and_embed_assets(
cache: &mut HashMap<String, Vec<u8>>,
client: &Client,
url: &str,
node: &Handle,
options: &Options,
depth: u32,
) {
match node.data {
NodeData::Document => {
// Dig deeper
for child in node.children.borrow().iter() {
walk_and_embed_assets(cache, client, &url, child, options, depth);
}
}
NodeData::Element {
ref name,
ref attrs,
..
} => {
let attrs_mut = &mut attrs.borrow_mut();
match name.local.as_ref() {
"meta" => {
// Determine type
let mut is_unwanted_meta: bool = false;
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("http-equiv") {
let value: String = attr.value.to_string();
is_unwanted_meta = value.eq_ignore_ascii_case("refresh")
|| value.eq_ignore_ascii_case("location");
}
}
if is_unwanted_meta {
// Strip this node off all its attributes
while attrs_mut.len() > 0 {
attrs_mut.remove(0);
}
}
}
"link" => {
// Remove integrity attributes, keep value of the last one
let mut integrity: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("integrity") {
integrity = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
enum LinkType {
Icon,
Stylesheet,
Preload,
DnsPrefetch,
Unknown,
}
let mut link_type = LinkType::Unknown;
for attr in attrs_mut.iter_mut() {
if &attr.name.local == "rel" {
let value = attr.value.trim();
if is_icon(value) {
link_type = LinkType::Icon;
break;
} else if value.eq_ignore_ascii_case("stylesheet") {
link_type = LinkType::Stylesheet;
break;
} else if value.eq_ignore_ascii_case("preload") {
link_type = LinkType::Preload;
break;
} else if value.eq_ignore_ascii_case("dns-prefetch") {
link_type = LinkType::DnsPrefetch;
break;
}
}
}
let link_type = link_type;
match link_type {
LinkType::Icon => {
// Find and remove href attribute(s), keep value of the last found one
let mut link_href: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("href") {
link_href = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if !options.no_images && !link_href.is_empty() {
let link_href_full_url =
resolve_url(&url, link_href).unwrap_or_default();
let link_href_url_fragment =
get_url_fragment(link_href_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&link_href_full_url,
options.silent,
depth + 1,
) {
Ok((
link_href_data,
link_href_final_url,
link_href_media_type,
)) => {
// Check integrity
if integrity.is_empty()
|| has_proper_integrity(&link_href_data, &integrity)
{
let link_href_data_url = data_to_data_url(
&link_href_media_type,
&link_href_data,
&link_href_final_url,
);
// Add new data URL href attribute
let assembled_url: String = url_with_fragment(
link_href_data_url.as_str(),
link_href_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(
None,
ns!(),
local_name!("href"),
),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(link_href_full_url.clone()) {
let assembled_url: String = url_with_fragment(
link_href_full_url.as_str(),
link_href_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(
None,
ns!(),
local_name!("href"),
),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
}
}
}
LinkType::Stylesheet => {
// Find and remove href attribute(s), keep value of the last found one
let mut link_href: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("href") {
link_href = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if !options.no_css && !link_href.is_empty() {
let link_href_full_url =
resolve_url(&url, link_href).unwrap_or_default();
match retrieve_asset(
cache,
client,
&url,
&link_href_full_url,
options.silent,
depth + 1,
) {
Ok((
link_href_data,
link_href_final_url,
_link_href_media_type,
)) => {
// Check integrity
if integrity.is_empty()
|| has_proper_integrity(&link_href_data, &integrity)
{
let css: String = embed_css(
cache,
client,
&link_href_final_url,
&String::from_utf8_lossy(&link_href_data),
options,
depth + 1,
);
let link_href_data_url = data_to_data_url(
"text/css",
css.as_bytes(),
&link_href_final_url,
);
// Add new data URL href attribute
attrs_mut.push(Attribute {
name: QualName::new(
None,
ns!(),
local_name!("href"),
),
value: Tendril::from_slice(
link_href_data_url.as_ref(),
),
});
}
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(link_href_full_url.clone()) {
attrs_mut.push(Attribute {
name: QualName::new(
None,
ns!(),
local_name!("href"),
),
value: Tendril::from_slice(
link_href_full_url.as_ref(),
),
});
}
}
}
}
}
LinkType::Preload | LinkType::DnsPrefetch => {
// Since all resources are embedded as data URL, preloading and prefetching are unnecessary
for _ in 0..attrs_mut.len() {
attrs_mut.remove(0);
}
}
LinkType::Unknown => {
// Make sure that all other LINKs' href attributes are full URLs
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("href") {
let href_full_url =
resolve_url(&url, attr.value.trim()).unwrap_or_default();
attr.value.clear();
attr.value.push_slice(&href_full_url.as_str());
}
}
}
}
}
"base" => {
if is_http_url(url) {
// Ensure BASE href is a full URL, not a relative one
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("href") {
let href_full_url =
resolve_url(&url, attr.value.trim()).unwrap_or_default();
attr.value.clear();
attr.value.push_slice(&href_full_url.as_str());
}
}
}
}
"body" => {
// Find and remove background attribute(s), keep value of the last found one
let mut background: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("background") {
background = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if !options.no_images && !background.is_empty() {
let background_full_url = resolve_url(&url, background).unwrap_or_default();
let background_url_fragment = get_url_fragment(background_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&background_full_url,
options.silent,
depth + 1,
) {
Ok((background_data, background_final_url, background_media_type)) => {
let background_data_url = data_to_data_url(
&background_media_type,
&background_data,
&background_final_url,
);
// Add new data URL background attribute
let assembled_url: String = url_with_fragment(
background_data_url.as_str(),
background_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("background")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(background_full_url.clone()) {
let assembled_url: String = url_with_fragment(
background_full_url.as_str(),
background_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("background")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
}
}
}
"img" => {
// Find source attribute(s)
let mut img_data_src: String = str!();
let mut img_src: String = str!();
let mut img_srcset: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("data-src") {
img_data_src = str!(attrs_mut.remove(i).value.trim());
} else if attr_name.eq_ignore_ascii_case("src") {
img_src = str!(attrs_mut.remove(i).value.trim());
} else if attr_name.eq_ignore_ascii_case("srcset") {
img_srcset = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if options.no_images {
// Add empty image src attribute
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(empty_image!()),
});
} else {
if img_src.is_empty() && img_data_src.is_empty() {
// Add empty src attribute
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(""),
});
} else {
// Add data URL src attribute
let img_full_url = resolve_url(
&url,
if !img_data_src.is_empty() {
img_data_src
} else {
img_src
},
)
.unwrap_or_default();
let img_url_fragment = get_url_fragment(img_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&img_full_url,
options.silent,
depth + 1,
) {
Ok((img_data, img_final_url, img_media_type)) => {
let img_data_url = data_to_data_url(
&img_media_type,
&img_data,
&img_final_url,
);
let assembled_url: String = url_with_fragment(
img_data_url.as_str(),
img_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(img_full_url.clone()) {
let assembled_url: String = url_with_fragment(
img_full_url.as_str(),
img_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
}
}
}
if !img_srcset.is_empty() {
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("srcset")),
value: Tendril::from_slice(
embed_srcset(cache, client, &url, &img_srcset, options, depth)
.as_ref(),
),
});
}
}
"svg" => {
if options.no_images {
node.children.borrow_mut().clear();
}
}
"input" => {
// Determine input type
let mut is_image_input: bool = false;
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("type") {
is_image_input = attr.value.to_string().eq_ignore_ascii_case("image");
}
}
if is_image_input {
let mut input_image_src: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("src") {
input_image_src = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if options.no_images || input_image_src.is_empty() {
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(if input_image_src.is_empty() {
""
} else {
empty_image!()
}),
});
} else {
let input_image_full_url =
resolve_url(&url, input_image_src).unwrap_or_default();
let input_image_url_fragment =
get_url_fragment(input_image_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&input_image_full_url,
options.silent,
depth + 1,
) {
Ok((
input_image_data,
input_image_final_url,
input_image_media_type,
)) => {
let input_image_data_url = data_to_data_url(
&input_image_media_type,
&input_image_data,
&input_image_final_url,
);
// Add data URL src attribute
let assembled_url: String = url_with_fragment(
input_image_data_url.as_str(),
input_image_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(input_image_full_url.clone()) {
let assembled_url: String = url_with_fragment(
input_image_full_url.as_str(),
input_image_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
}
}
}
}
"image" => {
// Find and remove (xlink:)href attribute(s), keep value of the last one
let mut image_href: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("xlink:href")
|| attr_name.eq_ignore_ascii_case("href")
{
image_href = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if !options.no_images && !image_href.is_empty() {
let image_full_url = resolve_url(&url, image_href).unwrap_or_default();
let image_url_fragment = get_url_fragment(image_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&image_full_url,
options.silent,
depth + 1,
) {
Ok((image_data, image_final_url, image_media_type)) => {
let image_data_url = data_to_data_url(
&image_media_type,
&image_data,
&image_final_url,
);
// Add new data URL href attribute
let assembled_url: String = url_with_fragment(
image_data_url.as_str(),
image_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("href")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(image_full_url.clone()) {
let assembled_url: String = url_with_fragment(
image_full_url.as_str(),
image_url_fragment.as_str(),
);
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("href")),
value: Tendril::from_slice(assembled_url.as_ref()),
});
}
}
}
}
}
"source" => {
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("src") {
let src_full_url = resolve_url(&url, attr.value.trim())
.unwrap_or_else(|_| attr.value.to_string());
attr.value.clear();
attr.value.push_slice(src_full_url.as_str());
} else if attr_name.eq_ignore_ascii_case("srcset") {
if get_node_name(&get_parent_node(&node)) == Some("picture") {
if options.no_images {
attr.value.clear();
attr.value.push_slice(empty_image!());
} else {
let srcset_full_url =
resolve_url(&url, attr.value.trim()).unwrap_or_default();
let srcset_url_fragment =
get_url_fragment(srcset_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&srcset_full_url,
options.silent,
depth + 1,
) {
Ok((srcset_data, srcset_final_url, srcset_media_type)) => {
let srcset_data_url = data_to_data_url(
&srcset_media_type,
&srcset_data,
&srcset_final_url,
);
attr.value.clear();
let assembled_url: String = url_with_fragment(
srcset_data_url.as_str(),
srcset_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(srcset_full_url.clone()) {
attr.value.clear();
let assembled_url: String = url_with_fragment(
srcset_full_url.as_str(),
srcset_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
}
}
}
}
}
}
}
"a" | "area" => {
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("href") {
let attr_value = attr.value.trim();
if options.no_js && attr_value.trim().starts_with("javascript:") {
attr.value.clear();
// Replace with empty JS call to preserve original behavior
attr.value.push_slice("javascript:;");
continue;
}
// Don't touch email links or hrefs which begin with a hash sign
if attr_value.starts_with('#') || url_has_protocol(attr_value) {
continue;
}
let href_full_url = resolve_url(&url, attr_value).unwrap_or_default();
attr.value.clear();
attr.value.push_slice(href_full_url.as_str());
}
}
}
"script" => {
// Remove integrity and src attributes, keep values of the last ones
let mut script_integrity: String = str!();
let mut script_src: String = str!();
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("integrity") {
script_integrity = str!(attrs_mut.remove(i).value.trim());
} else if attr_name.eq_ignore_ascii_case("src") {
script_src = str!(attrs_mut.remove(i).value.trim());
} else {
i += 1;
}
}
if options.no_js {
// Empty inner content (src is already gone)
node.children.borrow_mut().clear();
} else if !script_src.is_empty() {
let script_full_url = resolve_url(&url, script_src).unwrap_or_default();
match retrieve_asset(
cache,
client,
&url,
&script_full_url,
options.silent,
depth + 1,
) {
Ok((script_data, script_final_url, _script_media_type)) => {
// Only embed if we're able to validate integrity
if script_integrity.is_empty()
|| has_proper_integrity(&script_data, &script_integrity)
{
let script_data_url = data_to_data_url(
"application/javascript",
&script_data,
&script_final_url,
);
// Add new data URL src attribute
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(script_data_url.as_ref()),
});
}
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(script_full_url.clone()) {
attrs_mut.push(Attribute {
name: QualName::new(None, ns!(), local_name!("src")),
value: Tendril::from_slice(script_full_url.as_ref()),
});
}
}
};
}
}
"style" => {
if options.no_css {
// Empty inner content of STYLE tags
node.children.borrow_mut().clear();
} else {
for node in node.children.borrow_mut().iter_mut() {
if let NodeData::Text { ref contents } = node.data {
let mut tendril = contents.borrow_mut();
let replacement = embed_css(
cache,
client,
&url,
tendril.as_ref(),
options,
depth,
);
tendril.clear();
tendril.push_slice(&replacement);
}
}
}
}
"form" => {
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("action") {
let form_action = attr.value.trim();
// Modify action property to ensure it's a full URL
if !is_http_url(form_action) {
let form_action_full_url =
resolve_url(&url, form_action).unwrap_or_default();
attr.value.clear();
attr.value.push_slice(form_action_full_url.as_str());
}
}
}
}
"frame" | "iframe" => {
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("src") {
if options.no_frames {
// Empty the src attribute
attr.value.clear();
continue;
}
let frame_src = attr.value.trim();
// Ignore (i)frames with empty source — they cause infinite loops
if frame_src.is_empty() {
continue;
}
let frame_full_url = resolve_url(&url, frame_src).unwrap_or_default();
let frame_url_fragment = get_url_fragment(frame_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&frame_full_url,
options.silent,
depth + 1,
) {
Ok((frame_data, frame_final_url, frame_media_type)) => {
let frame_dom =
html_to_dom(&String::from_utf8_lossy(&frame_data));
walk_and_embed_assets(
cache,
client,
&frame_final_url,
&frame_dom.document,
&options,
depth + 1,
);
let mut frame_data: Vec<u8> = Vec::new();
serialize(
&mut frame_data,
&frame_dom.document,
SerializeOpts::default(),
)
.unwrap();
let frame_data_url = data_to_data_url(
&frame_media_type,
&frame_data,
&frame_final_url,
);
attr.value.clear();
let assembled_url: String = url_with_fragment(
frame_data_url.as_str(),
frame_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(frame_full_url.clone()) {
attr.value.clear();
let assembled_url: String = url_with_fragment(
frame_full_url.as_str(),
frame_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
}
}
}
}
}
"video" => {
for attr in attrs_mut.iter_mut() {
let attr_name: &str = &attr.name.local;
if attr_name.eq_ignore_ascii_case("poster") {
let video_poster_url = attr.value.trim();
// Skip posters with empty source
if video_poster_url.is_empty() {
continue;
}
if options.no_images {
attr.value.clear();
continue;
}
let video_poster_full_url =
resolve_url(&url, video_poster_url).unwrap_or_default();
let video_poster_url_fragment =
get_url_fragment(video_poster_full_url.clone());
match retrieve_asset(
cache,
client,
&url,
&video_poster_full_url,
options.silent,
depth + 1,
) {
Ok((
video_poster_data,
video_poster_final_url,
video_poster_media_type,
)) => {
let video_poster_data_url = data_to_data_url(
&video_poster_media_type,
&video_poster_data,
&video_poster_final_url,
);
attr.value.clear();
let assembled_url: String = url_with_fragment(
video_poster_data_url.as_str(),
video_poster_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
Err(_) => {
// Keep remote reference if unable to retrieve the asset
if is_http_url(video_poster_full_url.clone()) {
attr.value.clear();
let assembled_url: String = url_with_fragment(
video_poster_full_url.as_str(),
video_poster_url_fragment.as_str(),
);
attr.value.push_slice(assembled_url.as_str());
}
}
}
}
}
}
_ => {}
}
// Process style attributes
if options.no_css {
// Get rid of style attributes
let mut i = 0;
while i < attrs_mut.len() {
let attr_name: &str = &attrs_mut[i].name.local;
if attr_name.eq_ignore_ascii_case("style") {
attrs_mut.remove(i);
} else {
i += 1;
}
}
} else {
// Otherwise, parse any links found in the attributes
for attribute in attrs_mut
.iter_mut()
.filter(|a| a.name.local.as_ref().eq_ignore_ascii_case("style"))
{
let replacement = embed_css(
cache,
client,
&url,
attribute.value.as_ref(),
options,
depth,
);
// let replacement = str!();
attribute.value.clear();
attribute.value.push_slice(&replacement);
}
}
if options.no_js {
// Get rid of JS event attributes
let mut js_attr_indexes = Vec::new();
for (i, attr) in attrs_mut.iter_mut().enumerate() {
if attr_is_event_handler(&attr.name.local) {
js_attr_indexes.push(i);
}
}
js_attr_indexes.reverse();
for attr_index in js_attr_indexes {
attrs_mut.remove(attr_index);
}
}
// Dig deeper
for child in node.children.borrow().iter() {
walk_and_embed_assets(cache, client, &url, child, options, depth);
}
}
_ => {
// Note: in case of options.no_js being set to true, there's no need to worry about
// getting rid of comments that may contain scripts, e.g. <!--[if IE]><script>...
// since that's not part of W3C standard and therefore gets ignored
// by browsers other than IE [5, 9]
}
}
}