nostr: implement ToBech32 trait for Nip21

Closes https://gitworkshop.dev/yukikishimoto.com/nostr/issues/note1anpkpjhtnky0sx27fvt3r8ff486u79rlmrfxdavj0f0hrmtuw80sz8rkxf

Signed-off-by: Yuki Kishimoto <[email protected]>

Author: yukibtc

crates/nostr/CHANGELOG.md

@@ -35,6 +35,7 @@
 
 ### Added
 
+- Implement `ToBech32` trait for `Nip21`
 - Add nip47 holdinvoice methods and notification (https://github.com/rust-nostr/nostr/pull/1019)
 - Add `TransactionState` to `LookupInvoiceResponse` and `PaymentNotification` (https://github.com/rust-nostr/nostr/pull/1045)
 - Add `description`, `description_hash`, `preimage`, `amount`, `created_at` and `expires_at` optional fields to `MakeInvoiceResponse` (https://github.com/rust-nostr/nostr/pull/1045)

crates/nostr/src/nips/nip21.rs

@@ -196,6 +196,20 @@ impl Nip21 {
     }
 }
 
+impl ToBech32 for Nip21 {
+    type Err = Error;
+
+    fn to_bech32(&self) -> Result<String, Self::Err> {
+        match self {
+            Self::Pubkey(val) => Ok(val.to_bech32()?),
+            Self::Profile(val) => Ok(val.to_bech32()?),
+            Self::EventId(val) => Ok(val.to_bech32()?),
+            Self::Event(val) => Ok(val.to_bech32()?),
+            Self::Coordinate(val) => Ok(val.to_bech32()?),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use core::str::FromStr;