feat: add more json serialisation methods

Author: goncalo-frade-iohk

uniffi/src/anoncreds.udl

@@ -36,7 +36,11 @@ enum RegistryType {
 
 interface LinkSecret {
     constructor();
+    [Throws=AnoncredsError, Name=new_from_json]
+    constructor(string json_string);
     string get_big_number();
+    [Throws=AnoncredsError]
+    string get_json();
 };
 
 interface Nonce {
@@ -75,6 +79,8 @@ interface CredentialDefinition {
     SignatureType get_signature_type();
     string get_tag();
     IssuerId get_issuer_id();
+    [Throws=AnoncredsError]
+    string get_json();
 };
 
 interface CredentialOffer {
@@ -85,18 +91,22 @@ interface CredentialOffer {
     string get_key_correctness_proof();
     Nonce get_nonce();
     string? get_method_name();
+    [Throws=AnoncredsError]
+    string get_json();
 };
 
 interface CredentialRequest {
     string get_blinded_credential_secrets_json();
     string get_blinded_credential_secrets_correctness_proof_json();
     Nonce get_nonce();
+    [Throws=AnoncredsError]
     string get_json();
 };
 
 interface CredentialKeyCorrectnessProof {
     [Throws=AnoncredsError]
     constructor(string json_string);
+    [Throws=AnoncredsError]
     string get_json();
 };
 

uniffi/src/types/cred_def.rs

@@ -84,6 +84,10 @@ impl CredentialDefinition {
     pub fn get_issuer_id(&self) -> IssuerId {
         self.core.issuer_id.clone()
     }
+
+    pub fn get_json(&self) -> Result<String, AnoncredsError> {
+        serde_json::to_string(&self.core).map_err(|_| AnoncredsError::ConversionError)
+    }
 }
 
 impl TryInto<AnoncredsCredentialDefinition> for CredentialDefinition {
@@ -191,8 +195,8 @@ impl CredentialKeyCorrectnessProof {
         return Ok(CredentialKeyCorrectnessProof { core: core_def })
     }
 
-    pub fn get_json(&self) -> String {
-        serde_json::to_string(&self.core.value).unwrap()
+    pub fn get_json(&self) -> Result<String, AnoncredsError> {
+        serde_json::to_string(&self.core).map_err(|_| AnoncredsError::ConversionError)
     }
 }
 

uniffi/src/types/cred_offer.rs

@@ -42,6 +42,10 @@ impl CredentialOffer {
     pub fn get_method_name(&self) -> Option<String> {
         self.core.method_name.clone()
     }
+
+    pub fn get_json(&self) -> Result<String, AnoncredsError> {
+        serde_json::to_string(&self.core).map_err(|_| AnoncredsError::ConversionError)
+    }
 }
 
 impl Clone for CredentialOffer {

uniffi/src/types/cred_req.rs

@@ -24,8 +24,8 @@ impl CredentialRequest {
         return Arc::new(Nonce { anoncreds_nonce: self.core.nonce.try_clone().unwrap() })
     }
 
-    pub fn get_json(&self) -> String {
-        serde_json::to_string(&self.core).unwrap()
+    pub fn get_json(&self) -> Result<String, AnoncredsError> {
+        serde_json::to_string(&self.core).map_err(|_| AnoncredsError::ConversionError)
     }
 }
 

uniffi/src/types/link_secret.rs

@@ -14,10 +14,20 @@ impl LinkSecret {
         LinkSecret { secret: secret }
     }
 
+    pub fn new_from_json(json_string: String) -> Result<Self, AnoncredsError> {
+        let core_def = AnoncredsLinkSecret::try_from(json_string.as_str()).map_err(|_| AnoncredsError::ConversionError)?;
+        return Ok(LinkSecret { secret: core_def })
+    }
+
     pub fn get_big_number(&self) -> String {
         let clone = self.clone();
         clone.into()
     }
+
+    pub fn get_json(&self) -> Result<String, AnoncredsError> {
+        let clone = self.clone();
+        return Ok(clone.into())
+    }
 }
 
 impl From<AnoncredsLinkSecret> for LinkSecret {