Add per-user ad_tag with global fallback and hot-reload

- Per-user ad_tag in [access.user_ad_tags], global fallback in general.ad_tag
- User tag overrides global; if no user tag, general.ad_tag is used
- Both general.ad_tag and user_ad_tags support hot-reload (no restart)

Cargo.lock

@@ -2087,7 +2087,7 @@ dependencies = [
 
 [[package]]
 name = "telemt"
-version = "3.0.13"
+version = "3.1.3"
 dependencies = [
  "aes",
  "anyhow",

README.md

@@ -215,10 +215,12 @@ hello = "00000000000000000000000000000000"
 
 ```
 ### Advanced
-#### Adtag
-To use channel advertising and usage statistics from Telegram, get Adtag from [@mtproxybot](https://t.me/mtproxybot), add this parameter to section `[General]`
+#### Adtag (per-user)
+To use channel advertising and usage statistics from Telegram, get an Adtag from [@mtproxybot](https://t.me/mtproxybot). Set it per user in `[access.user_ad_tags]` (32 hex chars):
 ```toml
-ad_tag = "00000000000000000000000000000000" # Replace zeros to your adtag from @mtproxybot
+[access.user_ad_tags]
+username1 = "11111111111111111111111111111111"  # Replace with your tag from @mtproxybot
+username2 = "22222222222222222222222222222222"
 ```
 #### Listening and Announce IPs
 To specify listening address and/or address in links, add to section `[[server.listeners]]` of config.toml:

config.toml

@@ -5,7 +5,9 @@
 # === General Settings ===
 [general]
 use_middle_proxy = false
+# Global ad_tag fallback when user has no per-user tag in [access.user_ad_tags]
 # ad_tag = "00000000000000000000000000000000"
+# Per-user ad_tag in [access.user_ad_tags] (32 hex from @MTProxybot)
 
 # === Log Level ===
 # Log level: debug | verbose | normal | silent

src/config/hot_reload.rs

@@ -5,9 +5,10 @@
 //! # What can be reloaded without restart
 //!
 //! | Section   | Field                          | Effect                                         |
-//! |-----------|-------------------------------|-----------------------------------|
+//! |-----------|--------------------------------|------------------------------------------------|
 //! | `general` | `log_level`                    | Filter updated via `log_level_tx`              |
-//! | `general` | `ad_tag`                      | Passed on next connection         |
+//! | `access`  | `user_ad_tags`                 | Passed on next connection                      |
+//! | `general` | `ad_tag`                       | Passed on next connection (fallback per-user)  |
 //! | `general` | `middle_proxy_pool_size`       | Passed on next connection                      |
 //! | `general` | `me_keepalive_*`               | Passed on next connection                      |
 //! | `general` | `desync_all_full`              | Applied immediately                            |
@@ -207,14 +208,17 @@ fn log_changes(
         log_tx.send(new_hot.log_level.clone()).ok();
     }
 
-    if old_hot.ad_tag != new_hot.ad_tag {
+    if old_hot.access.user_ad_tags != new_hot.access.user_ad_tags {
         info!(
-            "config reload: ad_tag: {} → {}",
-            old_hot.ad_tag.as_deref().unwrap_or("none"),
-            new_hot.ad_tag.as_deref().unwrap_or("none"),
+            "config reload: user_ad_tags updated ({} entries)",
+            new_hot.access.user_ad_tags.len(),
         );
     }
 
+    if old_hot.ad_tag != new_hot.ad_tag {
+        info!("config reload: general.ad_tag updated (applied on next connection)");
+    }
+
     if old_hot.dns_overrides != new_hot.dns_overrides {
         info!(
             "config reload: network.dns_overrides updated ({} entries)",

src/config/load.rs

@@ -532,7 +532,7 @@ impl ProxyConfig {
             )));
         }
 
-        if let Some(tag) = &self.general.ad_tag {
+        for (user, tag) in &self.access.user_ad_tags {
             let zeros = "00000000000000000000000000000000";
             if !is_valid_ad_tag(tag) {
                 return Err(ProxyError::Config(
@@ -540,7 +540,7 @@ impl ProxyConfig {
                 ));
             }
             if tag == zeros {
-                warn!("ad_tag is all zeros; register a valid proxy tag via @MTProxybot to enable sponsored channel");
+                warn!(user = %user, "user ad_tag is all zeros; register a valid proxy tag via @MTProxybot to enable sponsored channel");
             }
         }
 

src/config/types.rs

@@ -247,14 +247,15 @@ pub struct GeneralConfig {
     #[serde(default = "default_true")]
     pub use_middle_proxy: bool,
 
-    #[serde(default)]
-    pub ad_tag: Option<String>,
-
     /// Path to proxy-secret binary file (auto-downloaded if absent).
     /// Infrastructure secret from https://core.telegram.org/getProxySecret.
     #[serde(default = "default_proxy_secret_path")]
     pub proxy_secret_path: Option<String>,
 
+    /// Global ad_tag (32 hex chars from @MTProxybot). Fallback when user has no per-user tag in access.user_ad_tags.
+    #[serde(default)]
+    pub ad_tag: Option<String>,
+
     /// Public IP override for middle-proxy NAT environments.
     /// When set, this IP is used in ME key derivation and RPC_PROXY_REQ "our_addr".
     #[serde(default)]
@@ -807,6 +808,10 @@ pub struct AccessConfig {
     #[serde(default = "default_access_users")]
     pub users: HashMap<String, String>,
 
+    /// Per-user ad_tag (32 hex chars from @MTProxybot).
+    #[serde(default)]
+    pub user_ad_tags: HashMap<String, String>,
+
     #[serde(default)]
     pub user_max_tcp_conns: HashMap<String, usize>,
 
@@ -833,6 +838,7 @@ impl Default for AccessConfig {
     fn default() -> Self {
         Self {
             users: default_access_users(),
+            user_ad_tags: HashMap::new(),
             user_max_tcp_conns: HashMap::new(),
             user_expirations: HashMap::new(),
             user_data_quota: HashMap::new(),

src/main.rs

@@ -448,7 +448,7 @@ async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
             info!("Middle-proxy STUN probing disabled by network.stun_use=false");
         }
 
-        // ad_tag (proxy_tag) for advertising
+        // Global ad_tag (pool default). Used when user has no per-user tag in access.user_ad_tags.
         let proxy_tag = config
             .general
             .ad_tag

src/proxy/middle_relay.rs

@@ -238,7 +238,22 @@ where
     stats.increment_user_connects(&user);
     stats.increment_user_curr_connects(&user);
 
-    let proto_flags = proto_flags_for_tag(proto_tag, me_pool.has_proxy_tag());
+    // Per-user ad_tag from access.user_ad_tags; fallback to general.ad_tag (hot-reloadable)
+    let user_tag: Option<Vec<u8>> = config
+        .access
+        .user_ad_tags
+        .get(&user)
+        .and_then(|s| hex::decode(s).ok())
+        .filter(|v| v.len() == 16);
+    let global_tag: Option<Vec<u8>> = config
+        .general
+        .ad_tag
+        .as_ref()
+        .and_then(|s| hex::decode(s).ok())
+        .filter(|v| v.len() == 16);
+    let effective_tag = user_tag.or(global_tag);
+
+    let proto_flags = proto_flags_for_tag(proto_tag, effective_tag.is_some());
     debug!(
         trace_id = format_args!("0x{:016x}", trace_id),
         user = %user,
@@ -256,6 +271,7 @@ where
 
     let (c2me_tx, mut c2me_rx) = mpsc::channel::<C2MeCommand>(C2ME_CHANNEL_CAPACITY);
     let me_pool_c2me = me_pool.clone();
+    let effective_tag = effective_tag;
     let c2me_sender = tokio::spawn(async move {
         let mut sent_since_yield = 0usize;
         while let Some(cmd) = c2me_rx.recv().await {
@@ -268,6 +284,7 @@ where
                         translated_local_addr,
                         &payload,
                         flags,
+                        effective_tag.as_deref(),
                     ).await?;
                     sent_since_yield = sent_since_yield.saturating_add(1);
                     if should_yield_c2me_sender(sent_since_yield, !c2me_rx.is_empty()) {

src/transport/middle_proxy/send.rs

@@ -18,6 +18,7 @@ use rand::seq::SliceRandom;
 use super::registry::ConnMeta;
 
 impl MePool {
+    /// Send RPC_PROXY_REQ. `tag_override`: per-user ad_tag (from access.user_ad_tags); if None, uses pool default.
     pub async fn send_proxy_req(
         self: &Arc<Self>,
         conn_id: u64,
@@ -26,13 +27,15 @@ impl MePool {
         our_addr: SocketAddr,
         data: &[u8],
         proto_flags: u32,
+        tag_override: Option<&[u8]>,
     ) -> Result<()> {
+        let tag = tag_override.or(self.proxy_tag.as_deref());
         let payload = build_proxy_req_payload(
             conn_id,
             client_addr,
             our_addr,
             data,
-            self.proxy_tag.as_deref(),
+            tag,
             proto_flags,
         );
         let meta = ConnMeta {