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Cargo.toml

···
 
 [dependencies]
 json = "0.12.4"
+trust-dns-resolver = "0.20.1"

src/main.rs

···
+use trust_dns_resolver::Resolver;
+use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};
+
 fn help() {
     println!(
         "Help: tangled-on-commit
···
     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() {
···
     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