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dillo-did
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Charles E. Lehner 4 years ago
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.gitignore vendored
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/target

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Cargo.toml
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[package]
name = "dillo-did"
version = "0.1.0"
authors = ["Charles E. Lehner <cel@celehner.com>"]
license = "Apache-2.0"
edition = "2018"
[dependencies]
tokio = { version = "1.0", features = ["rt-multi-thread"] }
# didkit = { git = "https://github.com/spruceid/didkit/", rev = "c79e92f32ca1f07f2fadec0bb0860089e5aa9f7d" }
ssi = { git = "https://github.com/spruceid/ssi/", rev = "69255be2836475549bd366fd1ef7e8168a3ac52e", features = ["http-did"] }
did-key = { git = "https://github.com/spruceid/ssi/", rev = "69255be2836475549bd366fd1ef7e8168a3ac52e" }
did-web = { git = "https://github.com/spruceid/ssi/", rev = "69255be2836475549bd366fd1ef7e8168a3ac52e" }
did-tezos = { git = "https://github.com/spruceid/ssi/", rev = "69255be2836475549bd366fd1ef7e8168a3ac52e" }
thiserror = "1.0"
async-std = "1.9"
serde_json = "1.0"
[[bin]]
name = "did-dpi"
path = "src/main.rs"
# Optimize release for small binary size
[profile.release]
opt-level = 'z'
lto = true
codegen-units = 1

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LICENSE
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Apache License
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http://www.apache.org/licenses/
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40
Makefile
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.POSIX:
DILLO_DIR=~/.dillo
DPI_DIR=$(DILLO_DIR)/dpi
DPIDRC=$(DILLO_DIR)/dpidrc
PROTO=did
NAME=did
BIN_NAME=did.dpi
BIN=target/debug/did-dpi
SRC = src/main.rs
all: $(BIN)
test:
@#cargo test
cargo build
-dpidc stop
@#timeout 1 dillo did:asdf
$(BIN): $(SRC)
cargo build
install: $(BIN) install-proto
mkdir -p $(DPI_DIR)/$(NAME)
cp -f $(BIN) $(DPI_DIR)/$(NAME)/$(BIN_NAME)
link: $(BIN) install-proto
mkdir -p $(DPI_DIR)/$(NAME)
ln -frs $(BIN) $(DPI_DIR)/$(NAME)/$(BIN_NAME)
install-proto:
test -e $(DPIDRC) || cp /etc/dillo/dpidrc $(DPIDRC)
grep -qF 'proto.$(PROTO)=$(NAME)/$(BIN_NAME)' $(DPIDRC) ||\
echo 'proto.$(PROTO)=$(NAME)/$(BIN_NAME)' >> $(DPIDRC)
clean:
cargo clean
uninstall:
rm -f $(DPI_DIR)/$(NAME)/$(BIN_NAME)
test -s $(DPIDRC) && sed -i~ '/proto\.$(PROTO)=$(NAME)\/$(BIN_NAME)/d' $(DPIDRC)

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README.md
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# dillo-did
[Dillo][] plugin for [did][] ([Decentralized Identifier][did-core]) URIs. Written in [Rust][]. Requires [Rust nightly][]. Build using [Cargo][]. Uses [`ssi`][]/[DIDKit][].
## Screenshot
![dillo-did-key.png](&WqNWKdBcMwCAy4SatQOZ5XoaGu1B4IpUQcZrfFbjJTk=.sha256)
## Install from [git-ssb][]
```
git clone ssb://%T8QyhgamH7fmOiiYV/iWiSRmTDdxXje77teBB2yijGU=.sha256 dillo-did
cd dillo-did
make install
dpidc stop
```
You can also use `make link` instead of `make install`, to install via a symlink.
## Built-in supported [DID methods][]
- [did:key][]
- [did:web][]
- `did:tz`
## Fallback resolver for additional DID methods
Set environmental variable `DID_RESOLVER` to a URL for a [DID Resolver HTTP(S) endpoint][did-http] - e.g. to an instance of [Universal Resolver][].
## TODO
- Make external resolver URL(s) configurable via a config file
- Render DID documents more nicely
## License
Apache License, Version 2.0
[Dillo]: https://www.dillo.org/
[Rust]: https://www.rust-lang.org/
[Rust nightly]: https://doc.rust-lang.org/stable/book/appendix-07-nightly-rust.html
[Cargo]: https://github.com/rust-lang/cargo
[did]: https://www.iana.org/assignments/uri-schemes/prov/did
[did-core]: https://www.w3.org/TR/did-core/
[git-ssb]: %n92DiQh7ietE+R+X/I403LQoyf2DtR3WQfCkDKlheQU=.sha256
[DIDKit]: https://github.com/spruceid/didkit
[`ssi`]: https://github.com/spruceid/ssi
[did:key]: https://w3c-ccg.github.io/did-method-key/
[did:web]: https://w3c-ccg.github.io/did-method-web/
[did-http]: https://w3c-ccg.github.io/did-resolution/#bindings-https
[DID methods]: https://w3c.github.io/did-core/#methods
[Universal Resolver]: https://github.com/decentralized-identity/universal-registrar/

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src/dpip.rs
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use async_std::io::Bytes;
use async_std::io::Cursor;
use async_std::io::Read;
use async_std::io::ReadExt;
use async_std::stream::StreamExt;
use async_std::task::block_on;
use core::fmt::Display;
use core::fmt::Formatter;
use core::str::FromStr;
use std::collections::BTreeMap;
use std::result::Result;
use thiserror::Error;
#[derive(Debug, Clone, Default)]
pub struct Dpip {
pub name: Option<String>,
pub properties: BTreeMap<String, String>,
}
#[derive(Error, Debug)]
pub enum DpipParseError {
#[error("Invalid tag start character '{0}'")]
InvalidStart(char),
#[error("Invalid tag end character '{0}'")]
InvalidEnd(char),
#[error("Invalid value start character '{0}'")]
InvalidValueStart(char),
#[error("Tag value expected escaped quote or end but found '{0}'")]
InvalidValueEnd(char),
#[error("Unexpected space in key")]
InvalidKeySpace,
#[error("Unexpected quote in key")]
InvalidKeyQuote,
#[error("Stream ended before reading tag")]
EOF,
#[error(transparent)]
IO(#[from] async_std::io::Error),
#[error(transparent)]
Utf8(#[from] std::string::FromUtf8Error),
}
async fn read_value<T>(bytes: &mut Bytes<T>) -> Result<String, DpipParseError>
where
T: Read + Unpin,
{
let mut value_bytes = Vec::new();
match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'\'' => {}
byte => return Err(DpipParseError::InvalidValueStart(byte.into())),
}
while let Some(b) = match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'\'' => match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'\'' => Some(b'\''),
b' ' => None,
b => return Err(DpipParseError::InvalidValueEnd(b.into())),
},
b => Some(b),
} {
value_bytes.push(b);
}
let name = String::from_utf8(value_bytes)?;
Ok(name)
}
async fn read_initial_key_value<T>(
bytes: &mut Bytes<T>,
) -> Result<(String, Option<String>), DpipParseError>
where
T: Read + Unpin,
{
let mut name_bytes = Vec::new();
while let Some(b) = match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b' ' => {
let name = String::from_utf8(name_bytes)?;
return Ok((name, None));
}
b'=' => {
let name = String::from_utf8(name_bytes)?;
let value = read_value(bytes).await?;
return Ok((name, Some(value)));
}
b => Some(b),
} {
name_bytes.push(b);
}
Err(DpipParseError::EOF)
}
async fn read_key_value<T>(bytes: &mut Bytes<T>) -> Result<Option<(String, String)>, DpipParseError>
where
T: Read + Unpin,
{
let mut key_bytes = Vec::new();
while let Some(b) = match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'\'' => {
if key_bytes.is_empty() {
return Ok(None);
} else {
return Err(DpipParseError::InvalidKeyQuote);
}
}
b' ' => {
return Err(DpipParseError::InvalidKeySpace);
}
b'=' => None,
b => Some(b),
} {
key_bytes.push(b);
}
let key = String::from_utf8(key_bytes)?;
let value = read_value(bytes).await?;
Ok(Some((key, value)))
}
impl Dpip {
/// Create a dpip command with the given command name
pub fn cmd(cmd: &str) -> Self {
let mut dpip = Self::default();
dpip.properties.insert("cmd".to_string(), cmd.to_string());
dpip
}
/// Create a dpip command for serving a page
pub fn start_send_page(url: &str) -> Self {
let mut tag = Dpip::cmd("start_send_page");
tag.properties.insert("url".to_string(), url.to_string());
tag
}
/// Create a dpip command for sending a status message
pub fn send_status_message(msg: &str) -> Self {
let mut tag = Dpip::cmd("send_status_message");
tag.properties.insert("msg".to_string(), msg.to_string());
tag
}
/// Read a dpip tag.
///
/// Format (from dillo/dpip/dpip.c):
/// ```
/// "<"[*alpha] *(<name>"="Quote<escaped_value>Quote) " "Quote">"
/// ```
pub async fn read<T>(reader: &mut T) -> Result<Dpip, DpipParseError>
where
T: Read + Unpin,
{
let mut map = BTreeMap::new();
let mut bytes = reader.bytes();
match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'<' => {}
byte => return Err(DpipParseError::InvalidStart(byte.into())),
}
let tag_name = match read_initial_key_value(&mut bytes).await? {
(key, Some(value)) => {
map.insert(key, value);
None
}
(key, None) => Some(key),
};
while let Some((key, value)) = read_key_value(&mut bytes).await? {
map.insert(key, value);
}
match bytes.next().await.ok_or(DpipParseError::EOF)?? {
b'>' => {}
byte => return Err(DpipParseError::InvalidEnd(byte.into())),
}
Ok(Dpip {
name: tag_name,
properties: map,
})
}
}
impl FromStr for Dpip {
type Err = DpipParseError;
fn from_str(tag: &str) -> std::result::Result<Self, Self::Err> {
let mut reader = Cursor::new(tag.as_bytes().to_vec());
block_on(Dpip::read(&mut reader))
}
}
impl Display for Dpip {
fn fmt(&self, f: &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
write!(f, "<")?;
if let Some(name) = &self.name {
write!(f, "{} ", name)?;
}
for (key, value) in &self.properties {
write!(f, "{}='{}' ", key, value.replace("'", "''"))?;
}
write!(f, "'>")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn dpip() {
block_on(dpip_async());
}
async fn dpip_async() {
let tags = b"<a='b' '><c='d' e='f g' '><h='>' '><i='j''k' '>";
let mut reader = Cursor::new(tags.to_vec());
let tag = Dpip::read(&mut reader).await.unwrap();
assert_eq!(tag.to_string(), "<a='b' '>");
let tag = Dpip::read(&mut reader).await.unwrap();
assert_eq!(tag.to_string(), "<c='d' e='f g' '>");
let tag = Dpip::read(&mut reader).await.unwrap();
assert_eq!(tag.to_string(), "<h='>' '>");
let tag = Dpip::read(&mut reader).await.unwrap();
assert_eq!(tag.to_string(), "<i='j''k' '>");
let tag: Dpip = "<key='wouldn''t it be nice' '>".parse().unwrap();
assert_eq!(tag.properties["key"], "wouldn't it be nice");
let tags = b"<a='isn''t that=''cool'' yes' '>";
let mut reader = Cursor::new(tags.to_vec());
let tag = Dpip::read(&mut reader).await.unwrap();
assert_eq!(tag.properties["a"], "isn't that='cool' yes");
let tags = b"<bad = '>' '>";
let mut reader = Cursor::new(tags.to_vec());
Dpip::read(&mut reader).await.unwrap_err();
}
}

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src/main.rs
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use async_std::io::BufReader;
// use async_std::io::BufWriter;
use async_std::net::TcpListener;
use async_std::net::TcpStream;
use async_std::path::Path;
use async_std::prelude::*;
use async_std::stream::StreamExt;
use did_key::DIDKey;
use did_tezos::DIDTz;
use did_web::DIDWeb;
use dpip::Dpip;
use serde_json::Value;
use ssi::did::{DIDMethods, Document, Resource};
use ssi::did_resolve::{
dereference as dereference_did_url, Content, DereferencingInputMetadata, HTTPDIDResolver,
SeriesResolver,
};
use ssi::jsonld::{canonicalize_json_string, is_iri};
use std::env::{var, VarError};
use thiserror::Error;
use tokio::task;
mod dpip;
#[derive(Error, Debug)]
pub enum DpiError {
#[error(transparent)]
Dpip(#[from] dpip::DpipParseError),
#[error("Missing command tag")]
MissingCmd,
#[error("Expected auth message but found '{0}'")]
ExpectedAuth(String),
#[error("Expected auth '{0}' but found '{1}'")]
InvalidAuth(String, String),
#[error("Missing auth message")]
MissingAuthMsg,
#[error("Missing URL")]
MissingURL,
#[error(transparent)]
IO(#[from] async_std::io::Error),
#[error(transparent)]
JSON(#[from] serde_json::Error),
#[error(transparent)]
Env(#[from] VarError),
#[error("Unknown command '{0}'")]
UnknownCmd(String),
}
fn escape_html(s: &str) -> String {
s.replace("&", "&amp;")
.replace("<", "&lt;")
.replace(">", "&gt;")
.replace("\"", "&quot;")
}
// Pretty-print JSON Value as HTML, with IRIs hyperlinked.
fn linkify_value(value: &Value, indent: usize) -> String {
let nl = "\n".to_string() + &" ".repeat(indent);
let nl1 = "\n".to_string() + &" ".repeat(indent + 1);
match value {
Value::Object(object) => {
let mut string = "{".to_string() + &nl1;
let mut first = true;
for (key, value) in object {
if first {
first = false;
} else {
string.push(',');
string.push_str(&nl1);
}
string += &linkify_value(&Value::String(key.to_string()), indent + 1);
string += ": ";
string += &linkify_value(value, indent + 1);
}
string + &nl + "}"
}
Value::String(string) => {
if is_iri(&string) {
format!(
"\"<a href=\"{}\">{}</a>\"",
escape_html(string),
escape_html(canonicalize_json_string(string).trim_matches('"'))
)
} else {
canonicalize_json_string(string)
}
}
Value::Bool(true) => "true".to_string(),
Value::Bool(false) => "false".to_string(),
Value::Number(num) => num.to_string(),
Value::Array(vec) => {
let mut string = "[".to_string() + &nl1;
let mut first = true;
for value in vec {
if first {
first = false;
} else {
string.push(',');
string.push_str(&nl1);
}
string += &linkify_value(value, indent + 1);
}
string + &nl + "]"
}
Value::Null => "null".to_string(),
}
}
async fn serve_linkified_object(
stream: &mut TcpStream,
url: &str,
value: &Value,
) -> Result<(), DpiError> {
stream
.write_all(&Dpip::start_send_page(url).to_string().as_bytes())
.await?;
let html = linkify_value(value, 0);
stream
.write_all(format!("Content-Type: text/html\n\n<!doctype html><html><head><title>{}</title><meta charset=\"utf-8\"></head><body><pre>{}</pre></body></html>", escape_html(url), html).as_bytes())
.await?;
Ok(())
}
async fn serve_did_document(
stream: &mut TcpStream,
url: &str,
doc: &Document,
) -> Result<(), DpiError> {
let value = serde_json::to_value(doc)?;
return serve_linkified_object(stream, url, &value).await;
}
async fn serve_object(
stream: &mut TcpStream,
url: &str,
object: &Resource,
) -> Result<(), DpiError> {
let value = serde_json::to_value(object)?;
return serve_linkified_object(stream, url, &value).await;
}
async fn serve_plain(stream: &mut TcpStream, url: &str, body: &str) -> Result<(), DpiError> {
stream
.write_all(&Dpip::start_send_page(url).to_string().as_bytes())
.await?;
stream
.write_all(format!("Content-Type: text/plain\n\n{}", body).as_bytes())
.await?;
Ok(())
}
async fn handle_request(stream: &mut TcpStream, url: &str) -> Result<(), DpiError> {
if !url.starts_with("did:") {
let tag = Dpip::start_send_page(url);
stream.write_all(&tag.to_string().as_bytes()).await?;
stream
.write_all(b"Content-Type: text/plain\n\nNot Found\n")
.await?;
return Ok(());
}
let url = match url.split("#").next() {
Some(url) => url,
None => url,
};
// Set up the DID resolver
let mut resolvers = Vec::new();
// Built-in resolvable DID methods
let mut methods = DIDMethods::default();
methods.insert(&DIDKey);
methods.insert(&DIDTz);
methods.insert(&DIDWeb);
resolvers.push(methods.to_resolver());
// Fallback to resolve over HTTP(S)
let resolver_url_opt = match var("DID_RESOLVER") {
Ok(url) => Ok(Some(url)),
Err(VarError::NotPresent) => Ok(None),
Err(err) => Err(err),
}?;
let fallback_resolver_opt = match resolver_url_opt {
Some(url) => Some(HTTPDIDResolver::new(&url)),
None => None,
};
if let Some(fallback_resolver) = &fallback_resolver_opt {
resolvers.push(fallback_resolver);
}
let resolver = SeriesResolver { resolvers };
let deref_input_meta = DereferencingInputMetadata::default();
stream
.write_all(
&Dpip::send_status_message("Dereferencing DID URL...")
.to_string()
.as_bytes(),
)
.await?;
let (deref_meta, content, _content_meta) =
dereference_did_url(&resolver, url, &deref_input_meta).await;
if let Some(error) = deref_meta.error {
return serve_plain(stream, url, &error).await;
}
let content_type = deref_meta.content_type.unwrap_or_default();
match content {
Content::DIDDocument(did_doc) => {
return serve_did_document(stream, url, &did_doc).await;
}
Content::Object(object) => {
return serve_object(stream, url, &object).await;
}
_ => {}
}
// Only send content-types supported by Dillo
let content_type = match &content_type[..] {
"text/html" | "image/gif" | "image/png" | "image/jpeg" => content_type,
_ => "text/plain".to_string(),
};
let content_vec = content.into_vec().unwrap();
stream
.write_all(&Dpip::start_send_page(url).to_string().as_bytes())
.await?;
stream
.write_all(format!("Content-Type: {}\n\n", content_type).as_bytes())
.await?;
stream.write_all(&content_vec).await?;
Ok(())
}
async fn serve_error(mut stream: TcpStream, url: &str, err: DpiError) -> Result<(), DpiError> {
let tag = Dpip::start_send_page(url);
stream.write_all(&tag.to_string().as_bytes()).await?;
stream
.write_all(format!("Content-Type: text/plain\n\n{}\n\n{:?}\n", err, err).as_bytes())
.await?;
Ok(())
}
async fn handle_client(mut stream: TcpStream, auth: &str) -> Result<(), DpiError> {
let mut reader = BufReader::new(&stream);
// Read and validate auth command
let tag = Dpip::read(&mut reader).await?;
let cmd = tag.properties.get("cmd").ok_or(DpiError::MissingCmd)?;
if cmd != "auth" {
return Err(DpiError::ExpectedAuth(cmd.to_string()));
}
let msg = tag.properties.get("msg").ok_or(DpiError::MissingAuthMsg)?;
if msg != auth {
return Err(DpiError::InvalidAuth(auth.to_string(), msg.to_string()));
}
// Read next command
let tag = Dpip::read(&mut reader).await?;
let cmd = tag.properties.get("cmd").ok_or(DpiError::MissingCmd)?;
match &cmd[..] {
"DpiBye" => {
eprintln!("[dillo-did]: Got DpiBye.");
std::process::exit(0)
}
"open_url" => {
let url = tag.properties.get("url").ok_or(DpiError::MissingURL)?;
match handle_request(&mut stream, url).await {
Ok(ok) => Ok(ok),
Err(err) => serve_error(stream, url, err).await,
}
}
_ => {
eprintln!("tag: {:?}", tag);
Err(DpiError::UnknownCmd(cmd.to_string()))
}
}
}
async fn accept_loop(listener: &TcpListener, auth: &str) {
let mut incoming = listener.incoming();
while let Some(stream) = incoming.next().await {
let stream = stream.unwrap();
let auth = auth.to_string();
task::spawn(async move {
match handle_client(stream, &auth).await {
Ok(ok) => ok,
Err(err) => {
eprintln!("[dillo-did]: error: {}", err);
}
}
});
}
}
fn main() {
let rt = tokio::runtime::Runtime::new().unwrap();
rt.block_on(main_async())
}
async fn main_async() {
println!("[dillo-did]: starting");
let homedir = var("HOME").unwrap();
let keys_path = Path::new(&homedir).join(".dillo/dpid_comm_keys");
let keys = async_std::fs::read_to_string(keys_path).await.unwrap();
let (_port, auth) = match keys.split(" ").collect::<Vec<&str>>().as_slice() {
[port_str, auth_str] => (
u16::from_str_radix(port_str, 10).unwrap(),
auth_str.trim().to_string(),
),
_ => panic!("Unable to parse dpid comm keys file"),
};
use std::os::unix::io::AsRawFd;
use std::os::unix::io::FromRawFd;
let stdin_fd = std::io::stdin().as_raw_fd();
let listener = unsafe { TcpListener::from_raw_fd(stdin_fd) };
accept_loop(&listener, &auth).await;
}
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