feat: signature on mint witness

crates/cdk-sqlite/src/wallet/mod.rs

@@ -10,7 +10,7 @@ use cdk::cdk_database::{self, WalletDatabase};
 use cdk::mint_url::MintUrl;
 use cdk::nuts::{
     CurrencyUnit, Id, KeySetInfo, Keys, MeltQuoteState, MintInfo, MintQuoteState, Proof, PublicKey,
-    SpendingConditions, State,
+    SecretKey, SpendingConditions, State,
 };
 use cdk::secret::Secret;
 use cdk::types::ProofInfo;
@@ -347,8 +347,8 @@ WHERE id=?
         sqlx::query(
             r#"
 INSERT OR REPLACE INTO mint_quote
-(id, mint_url, amount, unit, request, state, expiry)
-VALUES (?, ?, ?, ?, ?, ?, ?);
+(id, mint_url, amount, unit, request, state, expiry, secret_key)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?);
         "#,
         )
         .bind(quote.id.to_string())
@@ -358,6 +358,7 @@ VALUES (?, ?, ?, ?, ?, ?, ?);
         .bind(quote.request)
         .bind(quote.state.to_string())
         .bind(quote.expiry as i64)
+        .bind(quote.secret_key.map(|p| p.to_string()))
         .execute(&self.pool)
         .await
         .map_err(Error::from)?;
@@ -832,9 +833,14 @@ fn sqlite_row_to_mint_quote(row: &SqliteRow) -> Result<MintQuote, Error> {
     let row_request: String = row.try_get("request").map_err(Error::from)?;
     let row_state: String = row.try_get("state").map_err(Error::from)?;
     let row_expiry: i64 = row.try_get("expiry").map_err(Error::from)?;
+    let row_secret: Option<String> = row.try_get("secret_key").map_err(Error::from)?;
 
     let state = MintQuoteState::from_str(&row_state)?;
 
+    let secret_key = row_secret
+        .map(|key| SecretKey::from_str(&key))
+        .transpose()?;
+
     Ok(MintQuote {
         id: row_id,
         mint_url: MintUrl::from_str(&row_mint_url)?,
@@ -843,6 +849,7 @@ fn sqlite_row_to_mint_quote(row: &SqliteRow) -> Result<MintQuote, Error> {
         request: row_request,
         state,
         expiry: row_expiry as u64,
+        secret_key,
     })
 }