From edfe55f586ead5c66ba941c98c1d897f1f82344c Mon Sep 17 00:00:00 2001
From: afterlifepro <vielle.dev@proton.me>
Date: Sat, 6 Sep 2025 00:05:40 +0100
Subject: [PATCH] Resolve did from handle with dns

---
 Cargo.lock  | 1006 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |    1 +
 src/main.rs |   47 +++
 3 files changed, 1054 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index 1683477..7d45463 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,15 +2,1021 @@
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+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
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 ]
diff --git a/Cargo.toml b/Cargo.toml
index 2d62bca..29070fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ rust-version = "1.88"
 
 [dependencies]
 json = "0.12.4"
+trust-dns-resolver = "0.20.1"
diff --git a/src/main.rs b/src/main.rs
index 330b444..665453c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,6 @@
+use trust_dns_resolver::Resolver;
+use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};
+
 fn help() {
     println!(
         "Help: tangled-on-commit
@@ -213,6 +216,42 @@ fn load_config() -> Result<Config, ()> {
     return Err(());
 }
 
+#[derive(Debug)]
+struct DidDoc {
+    did: String,
+}
+
+fn get_did(handle: String) -> Result<DidDoc, ()> {
+    // create a txt resolver
+    let resolver = match Resolver::new(ResolverConfig::default(), ResolverOpts::default()) {
+        Ok(val) => val,
+        Err(_) => return Err(()),
+    };
+
+    // resolve _atproto.handle to a TXT record
+    let txt_res = match resolver.txt_lookup("_atproto.".to_owned() + &handle) {
+        Ok(val) => val,
+        Err(_) => return Err(()), // collect all entries and convert to strings
+    }
+    .into_iter()
+    .map(|x| x.to_string())
+    .collect::<Vec<_>>();
+
+    // filter entries which do not start with `did=`
+    let did_res = txt_res
+        .clone()
+        .extract_if(.., |x| x.starts_with("did="))
+        .collect::<Vec<_>>();
+    // only 1 did= can exist
+    // https://atproto.com/specs/handle#:~:text=If%20multiple%20valid%20records%20with%20different%20DIDs%20are%20present,%20resolution%20should%20fail.
+    if did_res.len() != 1 {
+        return Err(());
+    }
+    let did = did_res[0].clone();
+
+    return Ok(DidDoc { did: did.clone() });
+}
+
 fn main() -> Result<(), ()> {
     // load configuration
     let config = match load_config() {
@@ -225,6 +264,14 @@ fn main() -> Result<(), ()> {
     println!("{:#?}", config);
 
     // resolve handle to did
+    let did_doc = match get_did(config.handle) {
+        Ok(res) => res,
+        Err(_) => {
+            // q
+            return Err(());
+        }
+    };
+    println!("{:#?}", did_doc);
     // resolve did+repoName to knotserver
 
     // connect to /events on knotserver
-- 
2.51.2