fix: mint url trailing slash (#757)

crates/cashu/src/mint_url.rs

@@ -24,9 +24,30 @@ pub enum Error {
 }
 
 /// MintUrl Url
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct MintUrl(String);
 
+impl Serialize for MintUrl {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        // Use the to_string implementation to get the correctly formatted URL
+        serializer.serialize_str(&self.to_string())
+    }
+}
+
+impl<'de> Deserialize<'de> for MintUrl {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        // Deserialize as a string and then use from_str to parse it correctly
+        let s = String::deserialize(deserializer)?;
+        MintUrl::from_str(&s).map_err(serde::de::Error::custom)
+    }
+}
+
 impl MintUrl {
     fn format_url(url: &str) -> Result<String, Error> {
         ensure_cdk!(!url.is_empty(), Error::InvalidUrl);
@@ -56,16 +77,29 @@ impl MintUrl {
             .join("/");
         let mut formatted_url = format!("{protocol}://{host}");
         if !path.is_empty() {
-            formatted_url.push_str(&format!("/{path}/"));
+            formatted_url.push_str(&format!("/{}", path));
         }
         Ok(formatted_url)
     }
 
     /// Join onto url
     pub fn join(&self, path: &str) -> Result<Url, Error> {
-        Url::parse(&self.0)
-            .and_then(|url| url.join(path))
-            .map_err(Into::into)
+        let url = Url::parse(&self.0)?;
+
+        // Get the current path segments
+        let base_path = url.path();
+
+        // Check if the path has a trailing slash to avoid double slashes
+        let normalized_path = if base_path.ends_with('/') {
+            format!("{}{}", base_path, path)
+        } else {
+            format!("{}/{}", base_path, path)
+        };
+
+        // Create a new URL with the combined path
+        let mut result = url.clone();
+        result.set_path(&normalized_path);
+        Ok(result)
     }
 
     /// Append path elements onto the URL
@@ -96,6 +130,7 @@ impl fmt::Display for MintUrl {
 mod tests {
 
     use super::*;
+    use crate::Token;
 
     #[test]
     fn test_trim_trailing_slashes() {
@@ -121,7 +156,7 @@ mod tests {
         assert_eq!(correct_cased_url, cased_url_formatted.to_string());
 
         let wrong_cased_url_with_path = "http://URL-to-check.com/PATH/to/check";
-        let correct_cased_url_with_path = "http://url-to-check.com/PATH/to/check/";
+        let correct_cased_url_with_path = "http://url-to-check.com/PATH/to/check";
 
         let cased_url_with_path_formatted = MintUrl::from_str(wrong_cased_url_with_path).unwrap();
         assert_eq!(
@@ -164,4 +199,32 @@ mod tests {
             url.join_paths(&["hello", "world"]).unwrap().to_string()
         );
     }
+
+    #[test]
+    fn test_mint_url_slash_eqality() {
+        let mint_url_with_slash_str = "https://mint.minibits.cash/Bitcoin/";
+        let mint_url_with_slash = MintUrl::from_str(mint_url_with_slash_str).unwrap();
+
+        let mint_url_without_slash_str = "https://mint.minibits.cash/Bitcoin";
+        let mint_url_without_slash = MintUrl::from_str(mint_url_without_slash_str).unwrap();
+
+        assert_eq!(mint_url_with_slash, mint_url_without_slash);
+        assert_eq!(
+            mint_url_with_slash.to_string(),
+            mint_url_without_slash_str.to_string()
+        );
+    }
+
+    #[test]
+    fn test_token_equality_trailing_slash() {
+        let token_with_slash = Token::from_str("cashuBo2FteCNodHRwczovL21pbnQubWluaWJpdHMuY2FzaC9CaXRjb2luL2F1Y3NhdGF0gaJhaUgAUAVQ8ElBRmFwgqRhYQhhc3hAYzg2NTZhZDg4MzVmOWVmMzVkYWQ1MTZjNGU5ZTU5ZjA3YzFmODg0NTc2NWY3M2FhNWMyMjVhOGI4MGM0ZGM0ZmFjWCECNpnvLdFcsaVbCPUlOzr78XtBoD3mm3jQcldsQ6iKUBFhZKNhZVggrER4tfjjiH0e-lf9H---us1yjQQi__ZCFB9yFwH4jDphc1ggZfP2KcQOWA110vLz11caZF1PuXN606caPO2ZCAhfdvphclggadgz0psQELNif3xJ5J2d_TJWtRKfDFSj7h2ZD4WSFeykYWECYXN4QGZlNjAzNjA1NWM1MzVlZTBlYjI3MjQ1NmUzNjJlNmNkOWViNDNkMWQxODg0M2MzMDQ4MGU0YzE2YjI0MDY5MDZhY1ghAilA3g2_NriE94uTPISd2CM-90x53mK5QNM2iyTFDlnTYWSjYWVYIExR7bUzqM6-lRU7PbbEfnPW1vnSzCEN4SArmJZqp_7bYXNYIJMKRTSlXumUjPWXX5V8-hGPSZ-OXZJiEWm6_IB93OUDYXJYIB8YsigK7dMX59Oiy4Rh05xU0n0rVAPV7g_YFx564ZVa").unwrap();
+
+        let token_without_slash = Token::from_str("cashuBo2FteCJodHRwczovL21pbnQubWluaWJpdHMuY2FzaC9CaXRjb2luYXVjc2F0YXSBomFpSABQBVDwSUFGYXCCpGFhCGFzeEBjODY1NmFkODgzNWY5ZWYzNWRhZDUxNmM0ZTllNTlmMDdjMWY4ODQ1NzY1ZjczYWE1YzIyNWE4YjgwYzRkYzRmYWNYIQI2me8t0VyxpVsI9SU7Ovvxe0GgPeabeNByV2xDqIpQEWFko2FlWCCsRHi1-OOIfR76V_0f7766zXKNBCL_9kIUH3IXAfiMOmFzWCBl8_YpxA5YDXXS8vPXVxpkXU-5c3rTpxo87ZkICF92-mFyWCBp2DPSmxAQs2J_fEnknZ39Mla1Ep8MVKPuHZkPhZIV7KRhYQJhc3hAZmU2MDM2MDU1YzUzNWVlMGViMjcyNDU2ZTM2MmU2Y2Q5ZWI0M2QxZDE4ODQzYzMwNDgwZTRjMTZiMjQwNjkwNmFjWCECKUDeDb82uIT3i5M8hJ3YIz73THneYrlA0zaLJMUOWdNhZKNhZVggTFHttTOozr6VFTs9tsR-c9bW-dLMIQ3hICuYlmqn_tthc1ggkwpFNKVe6ZSM9ZdflXz6EY9Jn45dkmIRabr8gH3c5QNhclggHxiyKArt0xfn06LLhGHTnFTSfStUA9XuD9gXHnrhlVo").unwrap();
+
+        let url_with_slash = token_with_slash.mint_url().unwrap();
+        let url_without_slash = token_without_slash.mint_url().unwrap();
+
+        assert_eq!(url_without_slash.to_string(), url_with_slash.to_string());
+        assert_eq!(url_without_slash, url_with_slash);
+    }
 }