add gossip join api

webxdcs can now have multiple gossip channels and decide where to send the message to.

src/tools.rs

@@ -8,14 +8,13 @@ use std::fmt;
 use std::io::{Cursor, Write};
 use std::mem;
 use std::path::{Path, PathBuf};
-use std::str::{from_utf8, FromStr};
+use std::str::from_utf8;
 use std::time::{Duration, SystemTime};
 
 use anyhow::{bail, Context as _, Result};
 use base64::Engine as _;
 use chrono::{Local, NaiveDateTime, NaiveTime, TimeZone};
 use futures::{StreamExt, TryStreamExt};
-use iroh_gossip::proto::TopicId;
 use mailparse::dateparse;
 use mailparse::headers::Headers;
 use mailparse::MailHeaderMap;
@@ -744,15 +743,6 @@ pub(crate) fn strip_rtlo_characters(input_str: &str) -> String {
     input_str.replace(|char| RTLO_CHARACTERS.contains(&char), "")
 }
 
-/// Generates a [TopicId] from some rfc724_mid.
-pub(crate) fn get_topic_from_msg_id(rfc724_mid: &str) -> Result<TopicId> {
-    TopicId::from_str(&iroh_base::base32::fmt(
-        rfc724_mid
-            .get(0..32)
-            .context("Can't get 32 bytes from rfc724_mid")?,
-    ))
-}
-
 #[cfg(test)]
 mod tests {
     #![allow(clippy::indexing_slicing)]