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tokio-xmpp: use new minidom tokenizer

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This commit is contained in:
Astro 2022-03-24 01:49:00 +01:00
parent dd8096aa1e
commit 9340dfe4ab
8 changed files with 84 additions and 274 deletions
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15
minidom/src/element.rs
View file

@ -84,7 +84,8 @@ pub struct Element {
/// This is only used when deserializing. If you have to use a custom prefix use
/// `ElementBuilder::prefix`.
pub(crate) prefix: Option<Prefix>,
prefixes: Prefixes,
/// Namespace declarations
pub prefixes: Prefixes,
attributes: BTreeMap<String, String>,
children: Vec<Node>,
}
@ -717,6 +718,18 @@ impl Element {
})?;
self.children.remove(idx).into_element()
}
/// Remove the leading nodes up to the first child element and
/// return it
pub fn unshift_child(&mut self) -> Option<Element> {
while self.children.len() > 0 {
if let Some(el) = self.children.remove(0).into_element() {
return Some(el);
}
}
None
}
}
/// An iterator over references to child elements of an `Element`.

11
minidom/src/error.rs
View file

@ -23,9 +23,6 @@ pub enum Error {
/// Error from the Tokenizer
TokenizerError(crate::tokenizer::TokenizerError),
/// An UTF-8 conversion error.
Utf8Error(::std::str::Utf8Error),
/// An I/O error, from std::io.
IoError(::std::io::Error),
@ -51,7 +48,6 @@ impl StdError for Error {
match self {
Error::XmlError(e) => Some(e),
Error::TokenizerError(e) => Some(e),
Error::Utf8Error(e) => Some(e),
Error::IoError(e) => Some(e),
Error::EndOfDocument => None,
Error::InvalidElementClosed => None,
@ -67,7 +63,6 @@ impl std::fmt::Display for Error {
match self {
Error::XmlError(e) => write!(fmt, "XML error: {}", e),
Error::TokenizerError(e) => write!(fmt, "XML tokenizer error: {}", e),
Error::Utf8Error(e) => write!(fmt, "UTF-8 error: {}", e),
Error::IoError(e) => write!(fmt, "IO error: {}", e),
Error::EndOfDocument => {
write!(fmt, "the end of the document has been reached prematurely")
@ -94,12 +89,6 @@ impl From<crate::tokenizer::TokenizerError> for Error {
}
}
impl From<::std::str::Utf8Error> for Error {
fn from(err: ::std::str::Utf8Error) -> Error {
Error::Utf8Error(err)
}
}
impl From<::std::io::Error> for Error {
fn from(err: ::std::io::Error) -> Error {
Error::IoError(err)

8
minidom/src/tokenizer.rs
View file

@ -3,7 +3,7 @@
//! Streaming tokenizer (SAX parser)
use bytes::BytesMut;
use super::Token;
use super::{Error, Token};
/// `Result::Err` type returned from `Tokenizer`
pub type TokenizerError = nom::error::Error<String>;
@ -32,7 +32,7 @@ impl Tokenizer {
}
/// Parse the next document fragment
pub fn pull(&mut self) -> Result<Option<Token>, TokenizerError> {
pub fn pull(&mut self) -> Result<Option<Token>, Error> {
/// cannot return an error with location info that points to
/// our buffer that we still want to mutate
fn with_input_to_owned(e: nom::error::Error<&[u8]>) -> TokenizerError {
@ -50,9 +50,9 @@ impl Tokenizer {
Result::Err(nom::Err::Incomplete(_)) =>
None,
Result::Err(nom::Err::Error(e)) =>
return Err(with_input_to_owned(e)),
return Err(with_input_to_owned(e).into()),
Result::Err(nom::Err::Failure(e)) =>
return Err(with_input_to_owned(e)),
return Err(with_input_to_owned(e).into()),
} };
match result {
Some((s_len, token)) => {

17
minidom/src/tree_builder.rs
View file

@ -32,12 +32,27 @@ impl TreeBuilder {
self.stack.len()
}
/// Get the top-most element from the stack but don't remove it
pub fn top(&mut self) -> Option<&Element> {
self.stack.last()
}
/// Pop the top-most element from the stack
pub fn pop(&mut self) -> Option<Element> {
fn pop(&mut self) -> Option<Element> {
self.prefixes_stack.pop();
self.stack.pop()
}
/// Unshift the first child of the top element
pub fn unshift_child(&mut self) -> Option<Element> {
let depth = self.stack.len();
if depth > 0 {
self.stack[depth - 1].unshift_child()
} else {
None
}
}
/// Lookup XML namespace declaration for given prefix (or no prefix)
fn lookup_prefix(&self, prefix: &Option<String>) -> Option<&str> {
for nss in self.prefixes_stack.iter().rev() {

2
tokio-xmpp/Cargo.toml
View file

@ -25,8 +25,8 @@ tokio-stream = { version = "0.1", features = [] }
tokio-util = { version = "0.6", features = ["codec"] }
trust-dns-proto = "0.20"
trust-dns-resolver = "0.20"
xml5ever = "0.16"
xmpp-parsers = "0.19"
minidom = "0.14"
webpki-roots = { version = "0.22", optional = true }
[build-dependencies]

51
tokio-xmpp/src/error.rs
View file

@ -5,7 +5,6 @@ use std::borrow::Cow;
use std::error::Error as StdError;
use std::fmt;
use std::io::Error as IoError;
use std::str::Utf8Error;
#[cfg(feature = "tls-rust")]
use tokio_rustls::rustls::client::InvalidDnsNameError;
#[cfg(feature = "tls-rust")]
@ -106,44 +105,6 @@ impl From<InvalidDnsNameError> for Error {
}
}
/// Causes for stream parsing errors
#[derive(Debug)]
pub enum ParserError {
/// Encoding error
Utf8(Utf8Error),
/// XML parse error
Parse(ParseError),
/// Illegal `</>`
ShortTag,
/// Required by `impl Decoder`
Io(IoError),
}
impl fmt::Display for ParserError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match self {
ParserError::Utf8(e) => write!(fmt, "UTF-8 error: {}", e),
ParserError::Parse(e) => write!(fmt, "parse error: {}", e),
ParserError::ShortTag => write!(fmt, "short tag"),
ParserError::Io(e) => write!(fmt, "IO error: {}", e),
}
}
}
impl StdError for ParserError {}
impl From<IoError> for ParserError {
fn from(e: IoError) -> Self {
ParserError::Io(e)
}
}
impl From<ParserError> for Error {
fn from(e: ParserError) -> Self {
ProtocolError::Parser(e).into()
}
}
/// XML parse error wrapper type
#[derive(Debug)]
pub struct ParseError(pub Cow<'static, str>);
@ -167,7 +128,7 @@ impl fmt::Display for ParseError {
#[derive(Debug)]
pub enum ProtocolError {
/// XML parser error
Parser(ParserError),
Parser(minidom::Error),
/// Error with expected stanza schema
Parsers(ParsersError),
/// No TLS available
@ -205,12 +166,18 @@ impl fmt::Display for ProtocolError {
impl StdError for ProtocolError {}
impl From<ParserError> for ProtocolError {
fn from(e: ParserError) -> Self {
impl From<minidom::Error> for ProtocolError {
fn from(e: minidom::Error) -> Self {
ProtocolError::Parser(e)
}
}
impl From<minidom::Error> for Error {
fn from(e: minidom::Error) -> Self {
ProtocolError::Parser(e).into()
}
}
impl From<ParsersError> for ProtocolError {
fn from(e: ParsersError) -> Self {
ProtocolError::Parsers(e)

2
tokio-xmpp/src/lib.rs
View file

@ -16,5 +16,5 @@ pub use client::{async_client::Client as AsyncClient, simple_client::Client as S
mod component;
pub use crate::component::Component;
mod error;
pub use crate::error::{AuthError, ConnecterError, Error, ParseError, ParserError, ProtocolError};
pub use crate::error::{AuthError, ConnecterError, Error, ParseError, ProtocolError};
pub use starttls::starttls;

252
tokio-xmpp/src/xmpp_codec.rs
View file

@ -1,24 +1,16 @@
//! XML stream parser for XMPP
use crate::{ParseError, ParserError};
use bytes::{BufMut, BytesMut};
use log::{debug, error};
use log::debug;
use std;
use std::borrow::Cow;
use std::collections::vec_deque::VecDeque;
use std::collections::HashMap;
use std::default::Default;
use std::fmt::Write;
use std::io;
use std::iter::FromIterator;
use std::str::from_utf8;
use std::sync::Arc;
use std::sync::Mutex;
use tokio_util::codec::{Decoder, Encoder};
use xml5ever::buffer_queue::BufferQueue;
use xml5ever::interface::Attribute;
use xml5ever::tokenizer::{Tag, TagKind, Token, TokenSink, XmlTokenizer};
use xmpp_parsers::Element;
use minidom::{Tokenizer, tree_builder::TreeBuilder};
use crate::Error;
/// Anything that can be sent or received on an XMPP/XML stream
#[derive(Debug, Clone, PartialEq, Eq)]
@ -33,175 +25,24 @@ pub enum Packet {
StreamEnd,
}
type QueueItem = Result<Packet, ParserError>;
/// Parser state
struct ParserSink {
// Ready stanzas, shared with XMPPCodec
queue: Arc<Mutex<VecDeque<QueueItem>>>,
// Parsing stack
stack: Vec<Element>,
ns_stack: Vec<HashMap<Option<String>, String>>,
}
impl ParserSink {
pub fn new(queue: Arc<Mutex<VecDeque<QueueItem>>>) -> Self {
ParserSink {
queue,
stack: vec![],
ns_stack: vec![],
}
}
fn push_queue(&self, pkt: Packet) {
self.queue.lock().unwrap().push_back(Ok(pkt));
}
fn push_queue_error(&self, e: ParserError) {
self.queue.lock().unwrap().push_back(Err(e));
}
/// Lookup XML namespace declaration for given prefix (or no prefix)
fn lookup_ns(&self, prefix: &Option<String>) -> Option<&str> {
for nss in self.ns_stack.iter().rev() {
if let Some(ns) = nss.get(prefix) {
return Some(ns);
}
}
None
}
fn handle_start_tag(&mut self, tag: Tag) {
let mut nss = HashMap::new();
let is_prefix_xmlns = |attr: &Attribute| {
attr.name
.prefix
.as_ref()
.map(|prefix| prefix.eq_str_ignore_ascii_case("xmlns"))
.unwrap_or(false)
};
for attr in &tag.attrs {
match attr.name.local.as_ref() {
"xmlns" => {
nss.insert(None, attr.value.as_ref().to_owned());
}
prefix if is_prefix_xmlns(attr) => {
nss.insert(Some(prefix.to_owned()), attr.value.as_ref().to_owned());
}
_ => (),
}
}
self.ns_stack.push(nss);
let el = {
let el_ns = self
.lookup_ns(&tag.name.prefix.map(|prefix| prefix.as_ref().to_owned()))
.unwrap();
let mut el_builder = Element::builder(tag.name.local.as_ref(), el_ns);
for attr in &tag.attrs {
match attr.name.local.as_ref() {
"xmlns" => (),
_ if is_prefix_xmlns(attr) => (),
_ => {
let attr_name = if let Some(ref prefix) = attr.name.prefix {
Cow::Owned(format!("{}:{}", prefix, attr.name.local))
} else {
Cow::Borrowed(attr.name.local.as_ref())
};
el_builder = el_builder.attr(attr_name, attr.value.as_ref());
}
}
}
el_builder.build()
};
if self.stack.is_empty() {
let attrs = HashMap::from_iter(tag.attrs.iter().map(|attr| {
(
attr.name.local.as_ref().to_owned(),
attr.value.as_ref().to_owned(),
)
}));
self.push_queue(Packet::StreamStart(attrs));
}
self.stack.push(el);
}
fn handle_end_tag(&mut self) {
let el = self.stack.pop().unwrap();
self.ns_stack.pop();
match self.stack.len() {
// </stream:stream>
0 => self.push_queue(Packet::StreamEnd),
// </stanza>
1 => self.push_queue(Packet::Stanza(el)),
len => {
let parent = &mut self.stack[len - 1];
parent.append_child(el);
}
}
}
}
impl TokenSink for ParserSink {
fn process_token(&mut self, token: Token) {
match token {
Token::TagToken(tag) => match tag.kind {
TagKind::StartTag => self.handle_start_tag(tag),
TagKind::EndTag => self.handle_end_tag(),
TagKind::EmptyTag => {
self.handle_start_tag(tag);
self.handle_end_tag();
}
TagKind::ShortTag => self.push_queue_error(ParserError::ShortTag),
},
Token::CharacterTokens(tendril) => match self.stack.len() {
0 | 1 => self.push_queue(Packet::Text(tendril.into())),
len => {
let el = &mut self.stack[len - 1];
el.append_text_node(tendril);
}
},
Token::EOFToken => self.push_queue(Packet::StreamEnd),
Token::ParseError(s) => {
self.push_queue_error(ParserError::Parse(ParseError(s)));
}
_ => (),
}
}
// fn end(&mut self) {
// }
}
/// Stateful encoder/decoder for a bytestream from/to XMPP `Packet`
pub struct XMPPCodec {
/// Outgoing
ns: Option<String>,
/// Incoming
parser: XmlTokenizer<ParserSink>,
/// For handling incoming truncated utf8
// TODO: optimize using tendrils?
buf: Vec<u8>,
/// Shared with ParserSink
queue: Arc<Mutex<VecDeque<QueueItem>>>,
tokenizer: Tokenizer,
stanza_builder: TreeBuilder,
}
impl XMPPCodec {
/// Constructor
pub fn new() -> Self {
let queue = Arc::new(Mutex::new(VecDeque::new()));
let sink = ParserSink::new(queue.clone());
// TODO: configure parser?
let parser = XmlTokenizer::new(sink, Default::default());
let tokenizer = Tokenizer::new();
let stanza_builder = TreeBuilder::new();
XMPPCodec {
ns: None,
parser,
queue,
buf: vec![],
tokenizer,
stanza_builder,
}
}
}
@ -214,57 +55,42 @@ impl Default for XMPPCodec {
impl Decoder for XMPPCodec {
type Item = Packet;
type Error = ParserError;
type Error = Error;
fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
let buf1: Box<dyn AsRef<[u8]>> = if !self.buf.is_empty() && !buf.is_empty() {
let mut prefix = std::mem::replace(&mut self.buf, vec![]);
prefix.extend_from_slice(&buf.split_to(buf.len()));
Box::new(prefix)
} else {
Box::new(buf.split_to(buf.len()))
};
let buf1 = buf1.as_ref().as_ref();
match from_utf8(buf1) {
Ok(s) => {
debug!("<< {:?}", s);
if !s.is_empty() {
let mut buffer_queue = BufferQueue::new();
let tendril = FromIterator::from_iter(s.chars());
buffer_queue.push_back(tendril);
self.parser.feed(&mut buffer_queue);
self.tokenizer.push(buf);
buf.clear();
while let Some(token) = self.tokenizer.pull()? {
let had_stream_root = self.stanza_builder.depth() > 0;
self.stanza_builder.process_token(token)?;
let has_stream_root = self.stanza_builder.depth() > 0;
if ! had_stream_root && has_stream_root {
let root = self.stanza_builder.top().unwrap();
let attrs = root.attrs()
.map(|(name, value)| (name.to_owned(), value.to_owned()))
.chain(
root.prefixes.declared_prefixes()
.iter()
.map(|(prefix, namespace)| (
prefix.as_ref().map(|prefix| format!("xmlns:{}", prefix))
.unwrap_or_else(|| "xmlns".to_owned()),
namespace.clone()
))
)
.collect();
return Ok(Some(Packet::StreamStart(attrs)));
} else if self.stanza_builder.depth() == 1 {
if let Some(stanza) = self.stanza_builder.unshift_child() {
return Ok(Some(Packet::Stanza(stanza)));
}
}
// Remedies for truncated utf8
Err(e) if e.valid_up_to() >= buf1.len() - 3 => {
// Prepare all the valid data
let mut b = BytesMut::with_capacity(e.valid_up_to());
b.put(&buf1[0..e.valid_up_to()]);
// Retry
let result = self.decode(&mut b);
// Keep the tail back in
self.buf.extend_from_slice(&buf1[e.valid_up_to()..]);
return result;
}
Err(e) => {
error!(
"error {} at {}/{} in {:?}",
e,
e.valid_up_to(),
buf1.len(),
buf1
);
return Err(ParserError::Utf8(e));
} else if let Some(_) = self.stanza_builder.root.take() {
return Ok(Some(Packet::StreamEnd));
}
}
match self.queue.lock().unwrap().pop_front() {
None => Ok(None),
Some(result) => result.map(|pkt| Some(pkt)),
}
Ok(None)
}
fn decode_eof(&mut self, buf: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {