mls-spec 3.0.0-pre.2

This crate is a repository of MLS / RFC9420-related data structures.
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use std::borrow::Cow;

use crate::{
    MlsSpecError,
    group::{commits::Commit, proposals::Proposal},
};

#[derive(Debug, Clone, Copy, PartialEq, Eq, thalassa::TlsplAll, strum::Display)]
#[strum(prefix = "ContentType")]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[repr(u8)]
#[non_exhaustive]
pub enum ContentType {
    Reserved = 0x00,
    Application = 0x01,
    Proposal = 0x02,
    Commit = 0x03,
    #[cfg(feature = "draft-mahy-mls-new-content-types")]
    Status = crate::drafts::new_content_types::CONTENT_TYPE_STATUS,
    #[cfg(feature = "draft-mahy-mls-new-content-types")]
    Ephemeral = crate::drafts::new_content_types::CONTENT_TYPE_EPHEMERAL,
    #[cfg(feature = "draft-mularczyk-mls-splitcommit")]
    SplitCommit = crate::drafts::split_commit::CONTENT_TYPE_SPLIT_COMMIT,
}

impl TryFrom<u8> for ContentType {
    type Error = MlsSpecError;

    fn try_from(value: u8) -> Result<Self, Self::Error> {
        let ct = match value {
            0x00 => Self::Reserved,
            0x01 => Self::Application,
            0x02 => Self::Proposal,
            0x03 => Self::Commit,
            #[cfg(feature = "draft-mahy-mls-new-content-types")]
            crate::drafts::new_content_types::CONTENT_TYPE_STATUS => Self::Status,
            #[cfg(feature = "draft-mahy-mls-new-content-types")]
            crate::drafts::new_content_types::CONTENT_TYPE_EPHEMERAL => Self::Ephemeral,
            #[cfg(feature = "draft-mularczyk-mls-splitcommit")]
            crate::drafts::split_commit::CONTENT_TYPE_SPLIT_COMMIT => Self::SplitCommit,
            _ => return Err(MlsSpecError::InvalidContentType),
        };

        Ok(ct)
    }
}

#[derive(Debug, Clone, PartialEq, Eq, thalassa::TlsplAll)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[repr(u8)]
pub enum ContentTypeInner<'a> {
    #[tlspl(discriminant = "ContentType::Application")]
    Application { application_data: Cow<'a, [u8]> },
    #[tlspl(discriminant = "ContentType::Proposal")]
    Proposal { proposal: Proposal<'a> },
    #[tlspl(discriminant = "ContentType::Commit")]
    Commit { commit: Commit<'a> },
    #[cfg(feature = "draft-mularczyk-mls-splitcommit")]
    #[tlspl(discriminant = "ContentType::SplitCommit")]
    SplitCommit {
        split_commit: crate::drafts::split_commit::SplitCommit<'a>,
    },
    #[cfg(feature = "draft-mahy-mls-new-content-types")]
    #[tlspl(discriminant = "ContentType::Status")]
    Status { application_data: Cow<'a, [u8]> },
    #[cfg(feature = "draft-mahy-mls-new-content-types")]
    #[tlspl(discriminant = "ContentType::Ephemeral")]
    Ephemeral { application_data: Cow<'a, [u8]> },
}

impl From<&ContentTypeInner<'_>> for ContentType {
    fn from(value: &ContentTypeInner) -> Self {
        match value {
            ContentTypeInner::Application { .. } => ContentType::Application,
            ContentTypeInner::Proposal { .. } => ContentType::Proposal,
            ContentTypeInner::Commit { .. } => ContentType::Commit,
            #[cfg(feature = "draft-mularczyk-mls-splitcommit")]
            ContentTypeInner::SplitCommit { .. } => ContentType::SplitCommit,
            #[cfg(feature = "draft-mahy-mls-new-content-types")]
            ContentTypeInner::Status { .. } => ContentType::Status,
            #[cfg(feature = "draft-mahy-mls-new-content-types")]
            ContentTypeInner::Ephemeral { .. } => ContentType::Ephemeral,
        }
    }
}