mirror of
https://github.com/logos-messaging/libchat.git
synced 2026-06-27 19:49:31 +00:00
105 lines
3.2 KiB
Rust
105 lines
3.2 KiB
Rust
use openmls::{
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extensions::ExtensionType,
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prelude::{
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Capabilities,
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tls_codec::{Deserialize, Error as TlsError, Serialize, Size, VLByteSlice, VLBytes},
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},
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};
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use shared_traits::{IdentId, IdentIdRef};
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use std::io::{Read, Write};
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use crate::types::ConvoMetadata;
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pub const GROUP_METADATA_EXTENSION_TYPE: u16 = 0xFF01;
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pub fn capabilities_with_group_metadata() -> Capabilities {
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Capabilities::new(
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None, // default protocol versions
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None, // default ciphersuites
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Some(&[ExtensionType::Unknown(GROUP_METADATA_EXTENSION_TYPE)]),
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None, // default proposal types
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None, // default credential types
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)
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}
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#[derive(Debug, Clone)]
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pub struct ConvoMetaInfo {
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version: u16,
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name: String,
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owner: IdentId,
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desc: String,
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}
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impl ConvoMetaInfo {
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pub fn new(name: impl Into<String>, owner: IdentIdRef, desc: impl Into<String>) -> Self {
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Self {
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version: 1,
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name: name.into(),
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owner: owner.clone(),
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desc: desc.into(),
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}
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}
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pub fn to_extension_bytes(&self) -> Vec<u8> {
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// TLS presentation-language encoding — matches the wire format used by
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// the rest of the MLS stack, so no extra serializer is pulled in.
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self.tls_serialize_detached().expect("serialization failed")
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}
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pub fn from_extension_bytes(bytes: &[u8]) -> Result<Self, TlsError> {
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Self::tls_deserialize(&mut &bytes[..])
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}
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}
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// Each field is encoded as a variable-length opaque (`opaque <V>`); `IdentId`
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// and `String` aren't `tls_codec` types, so we encode/decode their UTF-8 bytes.
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impl Size for ConvoMetaInfo {
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fn tls_serialized_len(&self) -> usize {
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self.version.tls_serialized_len()
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+ VLByteSlice(self.name.as_bytes()).tls_serialized_len()
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+ VLByteSlice(self.owner.as_str().as_bytes()).tls_serialized_len()
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+ VLByteSlice(self.desc.as_bytes()).tls_serialized_len()
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}
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}
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impl Serialize for ConvoMetaInfo {
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fn tls_serialize<W: Write>(&self, writer: &mut W) -> Result<usize, TlsError> {
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let mut written = self.version.tls_serialize(writer)?;
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written += VLByteSlice(self.name.as_bytes()).tls_serialize(writer)?;
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written += VLByteSlice(self.owner.as_str().as_bytes()).tls_serialize(writer)?;
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written += VLByteSlice(self.desc.as_bytes()).tls_serialize(writer)?;
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Ok(written)
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}
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}
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impl Deserialize for ConvoMetaInfo {
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fn tls_deserialize<R: Read>(bytes: &mut R) -> Result<Self, TlsError> {
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let version = u16::tls_deserialize(bytes)?;
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let name = vl_string(bytes)?;
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let owner = IdentId::new(vl_string(bytes)?);
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let desc = vl_string(bytes)?;
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Ok(Self {
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version,
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name,
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owner,
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desc,
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})
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}
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}
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fn vl_string<R: Read>(bytes: &mut R) -> Result<String, TlsError> {
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let raw = VLBytes::tls_deserialize(bytes)?;
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String::from_utf8(raw.into())
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.map_err(|_| TlsError::DecodingError("invalid utf-8 in ConvoMetaInfo".into()))
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}
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impl From<ConvoMetaInfo> for ConvoMetadata {
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fn from(value: ConvoMetaInfo) -> Self {
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Self {
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owner: value.owner.to_string(),
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name: value.name,
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desc: value.desc,
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}
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}
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}
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