proxy-nostr-relay 0.3.1

A Nostr proxy relay with advanced bot filtering and an admin UI.
Documentation 
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use serde::{Deserialize, Serialize};
use serde_json::Value;

use super::event::Event;

/// NIP-01 client -> relay messages (subset we need).
#[derive(Debug, Clone)]
pub enum ClientMsg {
    Req { sub_id: String, filters: Vec<Value> },
    Close { sub_id: String },
    Event { event: Event },
}

/// NIP-01 relay -> client messages (subset we need).
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum RelayMsg {
    /// ["EVENT", <sub_id>, <event>]
    Event(String, Event),
    /// ["EOSE", <sub_id>]
    Eose(String),
    /// ["NOTICE", <message>]
    Notice(String),
}

#[derive(Debug, thiserror::Error)]
pub enum ParseClientMsgError {
    #[error("expected JSON array")]
    NotArray,
    #[error("missing command")]
    MissingCommand,
    #[error("command must be string")]
    CommandNotString,
    #[error("unsupported command: {0}")]
    UnsupportedCommand(String),
    #[error("invalid message: {0}")]
    Invalid(String),
    #[error(transparent)]
    Json(#[from] serde_json::Error),
}

pub fn parse_client_msg(text: &str) -> Result<ClientMsg, ParseClientMsgError> {
    let v: Value = serde_json::from_str(text)?;
    let arr = v.as_array().ok_or(ParseClientMsgError::NotArray)?;
    let cmd_v = arr.get(0).ok_or(ParseClientMsgError::MissingCommand)?;
    let cmd = cmd_v
        .as_str()
        .ok_or(ParseClientMsgError::CommandNotString)?
        .to_string();

    match cmd.as_str() {
        "REQ" => {
            let sub_id = arr
                .get(1)
                .and_then(|v| v.as_str())
                .ok_or_else(|| ParseClientMsgError::Invalid("REQ missing sub_id".into()))?
                .to_string();
            let filters = arr.iter().skip(2).cloned().collect::<Vec<_>>();
            Ok(ClientMsg::Req { sub_id, filters })
        }
        "CLOSE" => {
            let sub_id = arr
                .get(1)
                .and_then(|v| v.as_str())
                .ok_or_else(|| ParseClientMsgError::Invalid("CLOSE missing sub_id".into()))?
                .to_string();
            Ok(ClientMsg::Close { sub_id })
        }
        "EVENT" => {
            let ev_v = arr
                .get(1)
                .ok_or_else(|| ParseClientMsgError::Invalid("EVENT missing event".into()))?;
            let event: Event = serde_json::from_value(ev_v.clone())?;
            Ok(ClientMsg::Event { event })
        }
        other => Err(ParseClientMsgError::UnsupportedCommand(other.to_string())),
    }
}