From 1c56f3179c07be3b77353c3b3f6847a46a366e80 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Sun, 26 Nov 2017 19:12:38 -0800
Subject: helper command for generating dns lookup names

---
 src/bin/geniza-net.rs | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/src/bin/geniza-net.rs b/src/bin/geniza-net.rs
index a3abc61..853b497 100644
--- a/src/bin/geniza-net.rs
+++ b/src/bin/geniza-net.rs
@@ -28,6 +28,16 @@ fn run() -> Result<()> {
                 .arg_from_usage("<host_port> 'peer host:port to connect to'")
                 .arg_from_usage("<dat_key> 'dat key (public key) to register with'"),
         )
+        .subcommand(
+            SubCommand::with_name("discovery-key")
+                .about("Prints (in hex) the discovery key for a dat archive")
+                .arg_from_usage("<dat_key> 'dat key (public key) to convert (in hex)'"),
+        )
+        .subcommand(
+            SubCommand::with_name("discovery-dns-name")
+                .about("Prints the DNS name to query (mDNS or centrally) for peers")
+                .arg_from_usage("<dat_key> 'dat key (public key) to convert (in hex)'"),
+        )
         .get_matches();
 
 
@@ -69,6 +79,44 @@ fn run() -> Result<()> {
             dc.receive_all(true, 10)?;
             println!("Done!");
         }
+        ("discovery-key", Some(subm)) => {
+            let dat_key = subm.value_of("dat_key").unwrap();
+            if dat_key.len() != 32 * 2 {
+                bail!("dat key not correct length");
+            }
+            let mut key_bytes = vec![];
+            for i in 0..32 {
+                let r = u8::from_str_radix(&dat_key[2 * i..2 * i + 2], 16);
+                match r {
+                    Ok(b) => key_bytes.push(b),
+                    Err(e) => bail!("Problem with hex: {}", e),
+                };
+            }
+            let disc_key = make_discovery_key(&key_bytes);
+            for b in disc_key {
+                print!("{:02x}", b);
+            }
+            println!("");
+        }
+        ("discovery-dns-name", Some(subm)) => {
+            let dat_key = subm.value_of("dat_key").unwrap();
+            if dat_key.len() != 32 * 2 {
+                bail!("dat key not correct length");
+            }
+            let mut key_bytes = vec![];
+            for i in 0..32 {
+                let r = u8::from_str_radix(&dat_key[2 * i..2 * i + 2], 16);
+                match r {
+                    Ok(b) => key_bytes.push(b),
+                    Err(e) => bail!("Problem with hex: {}", e),
+                };
+            }
+            let disc_key = make_discovery_key(&key_bytes);
+            for b in 0..20 {
+                print!("{:02x}", disc_key[b]);
+            }
+            println!(".dat.local");
+        }
         _ => {
             println!("Missing or unimplemented command!");
             println!("{}", matches.usage());
-- 
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