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|
//! Module to serialize and enarmor a Cert and add informative headers.
use std::io;
use std::str;
use crate::armor;
use crate::cert::{Cert, amalgamation::ValidAmalgamation};
use crate::Result;
use crate::types::RevocationStatus;
use crate::serialize::{
Marshal, MarshalInto,
generic_serialize_into, generic_export_into,
};
use crate::policy::StandardPolicy as P;
/// Whether or not a character is printable.
pub(crate) fn is_printable(c: &char) -> bool {
// c.is_ascii_alphanumeric || c.is_whitespace || c.is_ascii_punctuation
// would exclude any utf8 character, so it seems that to obtain all
// printable chars, it works just excluding the control chars.
!c.is_control() && !c.is_ascii_control()
}
impl Cert {
/// Creates descriptive armor headers.
///
/// Returns armor headers that describe this Cert. The Cert's
/// primary fingerprint and valid userids (according to the
/// default policy) are included as comments, so that it is easier
/// to identify the Cert when looking at the armored data.
pub fn armor_headers(&self) -> Vec<String> {
let p = &P::default();
let length_value = armor::LINE_LENGTH - "Comment: ".len();
// Create a header per userid.
let mut headers: Vec<String> = self.userids().with_policy(p, None)
// Ignore revoked userids.
.filter_map(|uidb| {
if let RevocationStatus::Revoked(_) = uidb.revocation_status() {
None
} else {
Some(uidb)
}
// Ignore userids with non-printable characters.
}).filter_map(|uidb| {
let value = str::from_utf8(uidb.userid().value()).ok()?;
for c in value.chars().take(length_value) {
if !is_printable(&c){
return None;
}
}
// Make sure the line length does not exceed armor::LINE_LENGTH
Some(value.chars().take(length_value).collect())
}).collect();
// Add the fingerprint to the front.
headers.insert(0, self.fingerprint().to_string());
headers
}
/// Wraps this Cert in an armor structure when serialized.
///
/// Derives an object from this Cert that adds an armor structure
/// to the serialized Cert when it is serialized. Additionally,
/// the Cert's userids are added as comments, so that it is easier
/// to identify the Cert when looking at the armored data.
///
/// # Examples
///
/// ```rust
/// use sequoia_openpgp as openpgp;
/// use openpgp::cert::prelude::*;
/// use openpgp::serialize::SerializeInto;
///
/// # f().unwrap();
/// # fn f() -> openpgp::Result<()> {
/// let (cert, _) =
/// CertBuilder::general_purpose(None, Some("Mr. Pink ☮☮☮"))
/// .generate()?;
/// let armored = String::from_utf8(cert.armored().to_vec()?)?;
///
/// assert!(armored.starts_with("-----BEGIN PGP PUBLIC KEY BLOCK-----"));
/// assert!(armored.contains("Mr. Pink ☮☮☮"));
/// # Ok(()) }
/// ```
pub fn armored<'a>(&'a self)
-> impl crate::serialize::Serialize + crate::serialize::SerializeInto + 'a
{
Encoder::new(self)
}
}
/// A `Cert` to be armored and serialized.
struct Encoder<'a> {
cert: &'a Cert,
}
impl<'a> Encoder<'a> {
/// Returns a new Encoder to enarmor and serialize a `Cert`.
fn new(cert: &'a Cert) -> Self {
Self {
cert,
}
}
fn serialize_common(&self, o: &mut dyn io::Write, export: bool)
-> Result<()> {
let headers = self.cert.armor_headers();
// Convert the Vec<String> into Vec<(&str, &str)>
// `iter_into` can not be used here because will take ownership and
// what is needed is the reference.
let headers: Vec<_> = headers.iter()
.map(|value| ("Comment", value.as_str()))
.collect();
let mut w =
armor::Writer::with_headers(o, armor::Kind::PublicKey, headers)?;
if export {
self.cert.export(&mut w)?;
} else {
self.cert.serialize(&mut w)?;
}
w.finalize()?;
Ok(())
}
}
impl<'a> crate::serialize::Serialize for Encoder<'a> {}
impl<'a> Marshal for Encoder<'a> {
fn serialize(&self, o: &mut dyn io::Write) -> Result<()> {
self.serialize_common(o, false)
}
fn export(&self, o: &mut dyn io::Write) -> Result<()> {
self.serialize_common(o, true)
}
}
impl<'a> crate::serialize::SerializeInto for Encoder<'a> {}
impl<'a> MarshalInto for Encoder<'a> {
fn serialized_len(&self) -> usize {
let h = self.cert.armor_headers();
let headers_len =
("Comment: ".len() + 1 /* NL */) * h.len()
+ h.iter().map(|c| c.len()).sum::<usize>();
let body_len = (self.cert.serialized_len() + 2) / 3 * 4; // base64
"-----BEGIN PGP PUBLIC KEY BLOCK-----\n\n".len()
+ headers_len
+ body_len
+ (body_len + armor::LINE_LENGTH - 1) / armor::LINE_LENGTH // NLs
+ "=FUaG\n-----END PGP PUBLIC KEY BLOCK-----\n".len()
}
fn serialize_into(&self, buf: &mut [u8]) -> Result<usize> {
generic_serialize_into(self, self.serialized_len(), buf)
}
fn export_into(&self, buf: &mut [u8]) -> Result<usize> {
generic_export_into(self, self.serialized_len(), buf)
}
}
#[cfg(test)]
mod tests {
use crate::armor::{Kind, Reader, ReaderMode};
use crate::cert::prelude::*;
use crate::parse::Parse;
use super::*;
#[test]
fn is_printable_succeed() {
let chars: Vec<char> = vec![
'a', 'z', 'A', 'Z', '1', '9', '0',
'|', '!', '#', '$', '%', '^', '&', '*', '-', '+', '/',
// The following unicode characters were taken from:
// https://doc.rust-lang.org/std/primitive.char.html
'é', 'ß', 'ℝ',
|