enigma-protocol 0.1.0

High-level orchestrator that composes the Enigma crates into a production-ready messaging protocol
Documentation 
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use enigma_packet::{
    AttachmentChunkMeta, AttachmentKind, AttachmentMeta, Message, MessageMeta, MessageType,
};
use uuid::Uuid;

pub fn build_attachment_init(
    sender: &str,
    receiver: &str,
    attachment_id: Uuid,
    kind: AttachmentKind,
    filename: Option<&str>,
    content_type: Option<&str>,
    total_size: u64,
    chunk_size: u32,
    chunk_count: u32,
    timestamp_ms: u64,
) -> Message {
    let meta = AttachmentMeta {
        attachment_id,
        kind,
        filename: filename.map(|s| s.to_string()),
        content_type: content_type.map(|s| s.to_string()),
        total_size,
        chunk_size,
        chunk_count,
        sha256: None,
        created_at_ms: Some(timestamp_ms),
    };
    Message {
        id: Uuid::new_v4(),
        sender: sender.to_string(),
        receiver: receiver.to_string(),
        timestamp_ms,
        msg_type: MessageType::AttachmentInit,
        payload: Vec::new(),
        meta: MessageMeta::AttachmentInit(meta),
    }
}

pub fn build_attachment_chunks(
    sender: &str,
    receiver: &str,
    attachment_id: Uuid,
    bytes: &[u8],
    chunk_size: usize,
    base_timestamp_ms: u64,
) -> Vec<Message> {
    if chunk_size == 0 {
        return Vec::new();
    }
    let mut out = Vec::new();
    let mut index: u32 = 0;
    let mut offset: u64 = 0;
    let mut ts = base_timestamp_ms;
    for chunk in bytes.chunks(chunk_size) {
        let meta = AttachmentChunkMeta {
            attachment_id,
            index,
            offset,
            chunk_size: chunk.len() as u32,
            total_size: Some(bytes.len() as u64),
        };
        out.push(Message {
            id: Uuid::new_v4(),
            sender: sender.to_string(),
            receiver: receiver.to_string(),
            timestamp_ms: ts,
            msg_type: MessageType::AttachmentChunk,
            payload: chunk.to_vec(),
            meta: MessageMeta::AttachmentChunk(meta),
        });
        index = index.saturating_add(1);
        offset = offset.saturating_add(chunk.len() as u64);
        ts = ts.saturating_add(1);
    }
    out
}

pub fn build_attachment_end(
    sender: &str,
    receiver: &str,
    attachment_id: Uuid,
    total_size: u64,
    chunk_count: u32,
    timestamp_ms: u64,
) -> Message {
    Message {
        id: Uuid::new_v4(),
        sender: sender.to_string(),
        receiver: receiver.to_string(),
        timestamp_ms,
        msg_type: MessageType::AttachmentEnd,
        payload: Vec::new(),
        meta: MessageMeta::AttachmentEnd {
            attachment_id,
            sha256: None,
            total_size,
            chunk_count,
        },
    }
}