return application json encoded authorization response

Signed-off-by: Ryan Tate <[email protected]>

src/core/response/mod.rs

@@ -38,6 +38,16 @@ impl AuthorizationResponse {
 
         Ok(Self::Unencoded(UntypedObject(map).try_into()?))
     }
+
+    /// Decode the Authorization Response from 'application/json'.
+    pub fn from_json(bytes: &[u8]) -> Result<Self> {
+        let value = serde_json::from_slice::<Value>(bytes)?;
+        let map = value
+            .as_object()
+            .context("failed to parse JSON object")?
+            .clone();
+        Ok(Self::Unencoded(UntypedObject(map).try_into()?))
+    }
 }
 
 #[derive(Debug, Clone)]
@@ -57,6 +67,14 @@ impl UnencodedAuthorizationResponse {
             .context("failed to encode response as 'application/x-www-form-urlencoded'")
     }
 
+    /// Encode the authorization response as `application/json`.
+    pub fn into_json(self) -> Result<String> {
+        let mut inner = self.0;
+        inner.insert(self.1);
+        inner.insert(self.2);
+        serde_json::to_string(&inner).context("failed to encode response as 'application/json'")
+    }
+
     /// Return the Verifiable Presentation Token.
     pub fn vp_token(&self) -> &VpToken {
         &self.1

src/wallet.rs

@@ -39,14 +39,14 @@ pub trait Wallet: RequestVerifier + Sync {
         let http_request_body = match request.response_mode() {
             ResponseMode::DirectPost => {
                 http_request_builder = http_request_builder
-                    .header(CONTENT_TYPE, "application/x-www-form-urlencoded")
+                    .header(CONTENT_TYPE, "application/json")
                     .method("POST");
 
                 let AuthorizationResponse::Unencoded(unencoded) = response else {
                     bail!("unexpected AuthorizationResponse format")
                 };
 
-                unencoded.into_x_www_form_urlencoded()?.into_bytes()
+                unencoded.into_json()?.into_bytes()
             }
             ResponseMode::DirectPostJwt => {
                 http_request_builder = http_request_builder