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use std::path::{Path, PathBuf};
use html5ever::{
interface::QualName,
namespace_url, ns,
serialize::{HtmlSerializer, SerializeOpts, Serializer, TraversalScope},
tendril::TendrilSink,
LocalName,
};
pub use kuchiki::NodeRef;
use kuchiki::{Attribute, ExpandedName, NodeData};
use serde::Serialize;
#[cfg(feature = "isolation")]
use serialize_to_javascript::DefaultTemplate;
use crate::config::{DisabledCspModificationKind, PatternKind};
#[cfg(feature = "isolation")]
use crate::pattern::isolation::IsolationJavascriptCodegen;
pub const CSP_TOKEN: &str = "__TAURI_CSP__";
pub const SCRIPT_NONCE_TOKEN: &str = "__TAURI_SCRIPT_NONCE__";
pub const STYLE_NONCE_TOKEN: &str = "__TAURI_STYLE_NONCE__";
fn serialize_node_ref_internal<S: Serializer>(
node: &NodeRef,
serializer: &mut S,
traversal_scope: TraversalScope,
) -> crate::Result<()> {
match (traversal_scope, node.data()) {
(ref scope, &NodeData::Element(ref element)) => {
if *scope == TraversalScope::IncludeNode {
let attrs = element.attributes.borrow();
let attrs = attrs
.map
.iter()
.map(|(name, attr)| {
(
QualName::new(attr.prefix.clone(), name.ns.clone(), name.local.clone()),
&attr.value,
)
})
.collect::<Vec<_>>();
serializer.start_elem(
element.name.clone(),
attrs.iter().map(|&(ref name, value)| (name, &**value)),
)?
}
let children = match element.template_contents.as_ref() {
Some(template_root) => template_root.children(),
None => node.children(),
};
for child in children {
serialize_node_ref_internal(&child, serializer, TraversalScope::IncludeNode)?
}
if *scope == TraversalScope::IncludeNode {
serializer.end_elem(element.name.clone())?
}
Ok(())
}
(_, &NodeData::DocumentFragment) | (_, &NodeData::Document(_)) => {
for child in node.children() {
serialize_node_ref_internal(&child, serializer, TraversalScope::IncludeNode)?
}
Ok(())
}
(TraversalScope::ChildrenOnly(_), _) => Ok(()),
(TraversalScope::IncludeNode, &NodeData::Doctype(ref doctype)) => {
serializer.write_doctype(&doctype.name).map_err(Into::into)
}
(TraversalScope::IncludeNode, &NodeData::Text(ref text)) => {
serializer.write_text(&text.borrow()).map_err(Into::into)
}
(TraversalScope::IncludeNode, &NodeData::Comment(ref text)) => {
serializer.write_comment(&text.borrow()).map_err(Into::into)
}
(TraversalScope::IncludeNode, &NodeData::ProcessingInstruction(ref contents)) => {
let contents = contents.borrow();
serializer
.write_processing_instruction(&contents.0, &contents.1)
.map_err(Into::into)
}
}
}
pub fn serialize_node(node: &NodeRef) -> Vec<u8> {
let mut u8_vec = Vec::new();
let mut ser = HtmlSerializer::new(
&mut u8_vec,
SerializeOpts {
traversal_scope: TraversalScope::IncludeNode,
..Default::default()
},
);
serialize_node_ref_internal(node, &mut ser, TraversalScope::IncludeNode).unwrap();
u8_vec
}
pub fn parse(html: String) -> NodeRef {
kuchiki::parse_html().one(html)
}
fn with_head<F: FnOnce(&NodeRef)>(document: &mut NodeRef, f: F) {
if let Ok(ref node) = document.select_first("head") {
f(node.as_node())
} else {
let node = NodeRef::new_element(
QualName::new(None, ns!(html), LocalName::from("head")),
None,
);
f(&node);
document.prepend(node)
}
}
fn inject_nonce(document: &mut NodeRef, selector: &str, token: &str) {
if let Ok(scripts) = document.select(selector) {
for target in scripts {
let node = target.as_node();
let element = node.as_element().unwrap();
let mut attrs = element.attributes.borrow_mut();
if attrs.get("nonce").is_some() {
continue;
}
attrs.insert("nonce", token.into());
}
}
}
pub fn inject_nonce_token(
document: &mut NodeRef,
dangerous_disable_asset_csp_modification: &DisabledCspModificationKind,
) {
if dangerous_disable_asset_csp_modification.can_modify("script-src") {
inject_nonce(document, "script[src^='http']", SCRIPT_NONCE_TOKEN);
}
if dangerous_disable_asset_csp_modification.can_modify("style-src") {
inject_nonce(document, "style", STYLE_NONCE_TOKEN);
}
}
pub fn inject_csp(document: &mut NodeRef, csp: &str) {
with_head(document, |head| {
head.append(create_csp_meta_tag(csp));
});
}
pub fn inject_csp_token(document: &mut NodeRef) {
inject_csp(document, CSP_TOKEN)
}
fn create_csp_meta_tag(csp: &str) -> NodeRef {
NodeRef::new_element(
QualName::new(None, ns!(html), LocalName::from("meta")),
vec![
(
ExpandedName::new(ns!(), LocalName::from("http-equiv")),
Attribute {
prefix: None,
value: "Content-Security-Policy".into(),
},
),
(
ExpandedName::new(ns!(), LocalName::from("content")),
Attribute {
prefix: None,
value: csp.into(),
},
),
],
)
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "lowercase", tag = "pattern")]
pub enum PatternObject {
Brownfield,
Isolation {
side: IsolationSide,
},
}
impl From<&PatternKind> for PatternObject {
fn from(pattern_kind: &PatternKind) -> Self {
match pattern_kind {
PatternKind::Brownfield => Self::Brownfield,
PatternKind::Isolation { .. } => Self::Isolation {
side: IsolationSide::default(),
},
}
}
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum IsolationSide {
Original,
Secure,
}
impl Default for IsolationSide {
fn default() -> Self {
Self::Original
}
}
#[cfg(feature = "isolation")]
pub fn inject_codegen_isolation_script(document: &mut NodeRef) {
with_head(document, |head| {
let script = NodeRef::new_element(QualName::new(None, ns!(html), "script".into()), None);
script.append(NodeRef::new_text(
IsolationJavascriptCodegen {}
.render_default(&Default::default())
.expect("unable to render codegen isolation script template")
.into_string(),
));
head.prepend(script);
});
}
pub fn inline_isolation(document: &mut NodeRef, dir: &Path) {
for script in document
.select("script[src]")
.expect("unable to parse document for scripts")
{
let src = {
let attributes = script.attributes.borrow();
attributes
.get(LocalName::from("src"))
.expect("script with src attribute has no src value")
.to_string()
};
let mut path = PathBuf::from(src);
if path.has_root() {
path = path
.strip_prefix("/")
.expect("Tauri \"Isolation\" Pattern only supports relative or absolute (`/`) paths.")
.into();
}
let file = std::fs::read_to_string(dir.join(path)).expect("unable to find isolation file");
script.as_node().append(NodeRef::new_text(file));
let mut attributes = script.attributes.borrow_mut();
attributes.remove(LocalName::from("src"));
}
}
#[cfg(test)]
mod tests {
use kuchiki::traits::*;
#[test]
fn csp() {
let htmls = vec![
"<html><head></head></html>".to_string(),
"<html></html>".to_string(),
];
for html in htmls {
let mut document = kuchiki::parse_html().one(html);
super::inject_csp_token(&mut document);
assert_eq!(
document.to_string(),
format!(
r#"<html><head><meta content="{}" http-equiv="Content-Security-Policy"></head><body></body></html>"#,
super::CSP_TOKEN
)
);
}
}
}