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|
//! OpenPGP Web Key Directory client.
//!
//! A Web Key Directory is a Web service that can be queried with email
//! addresses to obtain the associated OpenPGP keys.
//!
//! It is specified in [draft-koch].
//!
//! See the [get example].
//!
//! [draft-koch]: https://datatracker.ietf.org/doc/html/draft-koch-openpgp-webkey-service/#section-3.1
//! [get example]: fn.get.html#example
//!
// XXX: We might want to merge the 2 structs in the future and move the
// functions to methods.
extern crate tempfile;
extern crate tokio_core;
use std::collections::HashMap;
use std::fmt;
use std::fs;
use std::path::{Path, PathBuf};
use anyhow::Context;
use futures::{future, Future, Stream};
use hyper::{Uri, Client};
use hyper_tls::HttpsConnector;
use url;
use crate::openpgp::{
Fingerprint,
Cert,
};
use crate::openpgp::parse::Parse;
use crate::openpgp::serialize::Marshal;
use crate::openpgp::types::HashAlgorithm;
use crate::openpgp::cert::prelude::*;
use super::{Result, Error};
/// WKD variants.
///
/// There are two variants of the URL scheme. `Advanced` should be
/// preferred.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Variant {
/// Advanced variant.
///
/// This method uses a separate subdomain and is more flexible.
/// This method should be preferred.
Advanced,
/// Direct variant.
///
/// This method is deprecated.
Direct,
}
impl Default for Variant {
fn default() -> Self {
Variant::Advanced
}
}
/// Stores the local_part and domain of an email address.
pub struct EmailAddress {
local_part: String,
domain: String,
}
impl EmailAddress {
/// Returns an EmailAddress from an email address string.
///
/// From [draft-koch]:
///
///```text
/// To help with the common pattern of using capitalized names
/// (e.g. "Joe.Doe@example.org") for mail addresses, and under the
/// premise that almost all MTAs treat the local-part case-insensitive
/// and that the domain-part is required to be compared
/// case-insensitive anyway, all upper-case ASCII characters in a User
/// ID are mapped to lowercase. Non-ASCII characters are not changed.
///```
fn from<S: AsRef<str>>(email_address: S) -> Result<Self> {
// Ensure that is a valid email address by parsing it and return the
// errors that it returns.
// This is also done in hagrid.
let email_address = email_address.as_ref();
let v: Vec<&str> = email_address.split('@').collect();
if v.len() != 2 {
return Err(Error::MalformedEmail(email_address.into()).into())
};
// Convert to lowercase without tailoring, i.e. without taking any
// locale into account. See:
// https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase
let email = EmailAddress {
local_part: v[0].to_lowercase(),
domain: v[1].to_lowercase()
};
Ok(email)
}
}
/// Stores the parts needed to create a Web Key Directory URL.
///
/// NOTE: This is a different `Url` than [`url::Url`] (`url` crate) that is
/// actually returned with the method [to_url](#method.to_url)
#[derive(Debug, Clone)]
pub struct Url {
domain: String,
local_encoded: String,
local_part: String,
}
impl fmt::Display for Url {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.build(None))
}
}
impl Url {
/// Returns a [`Url`] from an email address string.
pub fn from<S: AsRef<str>>(email_address: S) -> Result<Self> {
let email = EmailAddress::from(email_address)?;
let local_encoded = encode_local_part(&email.local_part);
let url = Url {
domain : email.domain,
local_encoded : local_encoded,
local_part : email.local_part,
};
Ok(url)
}
/// Returns an URL string from a [`Url`].
pub fn build<V>(&self, variant: V) -> String
where V: Into<Option<Variant>>
{
let variant = variant.into().unwrap_or_default();
if variant == Variant::Direct {
format!("https://{}/.well-known/openpgpkey/hu/{}?l={}",
self.domain, self.local_encoded, self.local_part)
} else {
format!("https://openpgpkey.{}/.well-known/openpgpkey/{}/hu/{}\
?l={}", self.domain, self.domain, self.local_encoded,
self.local_part)
}
}
/// Returns an [`url::Url`].
pub fn to_url<V>(&self, variant: V) -> Result<url::Url>
where V: Into<Option<Variant>> {
let url_string = self.build(variant);
let url_url = url::Url::parse(url_string.as_str())?;
Ok(url_url)
}
/// Returns an [`hyper::Uri`].
pub fn to_uri<V>(&self, variant: V) -> Result<Uri>
where V: Into<Option<Variant>> {
let url_string = self.build(variant);
let uri = url_string.as_str().parse::<Uri>()?;
Ok(uri)
}
/// Returns a [`PathBuf`].
pub fn to_file_path<V>(&self, variant: V) -> Result<PathBuf>
where V: Into<Option<Variant>>
{
// Create the directories string.
let variant = variant.into().unwrap_or_default();
let url = self.to_url(variant)?;
Ok(PathBuf::from(url.path()).strip_prefix("/")?.into())
}
}
/// Returns a 32 characters string from the local part of an email address
///
|