Credential values json serialize/deserialize

* added cred vals serialization methods to header
* added cred vals serialization methods to Golang code
* updated value builder test
* fixed comment

Signed-off-by: konstantin.goncharov <[email protected]>
Signed-off-by: Ry Jones <[email protected]>

.gitignore

@@ -2,3 +2,4 @@ build
 .idea/
 coverage.txt
 *.out
+.vscode/

pkg/libursa/ursa/ursa_cl.h

@@ -417,6 +417,26 @@ struct ExternError ursa_cl_credential_values_builder_finalize(const void *creden
  */
 struct ExternError ursa_cl_credential_values_builder_new(const void **credential_values_builder_p);
 
+/**
+ * Creates and returns credential values json.
+ *
+ * Note: Credential values instance deallocation must be performed by calling ursa_cl_credential_values_free.
+ *
+ * # Arguments
+ * * `credential_values_json` - Reference that contains credential values json.
+ * * `credential_values_p` - Reference that will contain credential values instance pointer.
+ */
+struct ExternError ursa_cl_credential_values_from_json(const char *credential_values_json, const void **credential_values_p);
+
+/**
+ * Returns json representation of credential values.
+ *
+ * # Arguments
+ * * `credential_values` - Reference that contains credential values instance pointer.
+ * * `credential_values_json_p` - Reference that will contain credential values json.
+ */
+struct ExternError ursa_cl_credential_values_to_json(const void *credential_values, const char **credential_values_json_p);
+
 /**
  * Deallocates credential values instance.
  *

pkg/libursa/ursa/value_builder.go

@@ -30,6 +30,20 @@ func NewValueBuilder() (*CredentialValuesBuilder, error) {
 	return &CredentialValuesBuilder{builder}, nil
 }
 
+// CredentialValuesFromJSON creates and returns credential values from JSON
+func CredentialValuesFromJSON(jsn []byte) (*CredentialValues, error) {
+	var ptr unsafe.Pointer
+	cjson := C.CString(string(jsn))
+	defer C.free(unsafe.Pointer(cjson))
+
+	result := C.ursa_cl_credential_values_from_json(cjson, &ptr)
+	if result.code != 0 {
+		return nil, ursaError(C.GoString(result.message))
+	}
+
+	return &CredentialValues{ptr}, nil
+}
+
 // AddDecHidden adds new hidden attribute dec_value to credential values map
 func (r *CredentialValuesBuilder) AddDecHidden(attr, decValue string) error {
 	cattr := C.CString(attr)
@@ -100,6 +114,19 @@ func (r *CredentialValues) Free() error {
 	return nil
 }
 
+// ToJSON returns JSON representation of credential values
+func (r *CredentialValues) ToJSON() ([]byte, error) {
+	var d *C.char
+	defer C.free(unsafe.Pointer(d))
+
+	result := C.ursa_cl_credential_values_to_json(r.ptr, &d)
+	if result.code != 0 {
+		return nil, ursaError(C.GoString(result.message))
+	}
+
+	return []byte(C.GoString(d)), nil
+}
+
 // EncodeValue encodes any value into decimal representation
 func EncodeValue(val interface{}) (string, string) {
 	var raw, enc string

pkg/libursa/ursa/value_builder_test.go

@@ -11,6 +11,22 @@ func TestNewValueBuilder(t *testing.T) {
 		builder, err := NewValueBuilder()
 		assert.Empty(t, err)
 		assert.NotEmpty(t, builder)
+
+		err = builder.AddDecHidden("master_secret", "122345")
+		assert.NoError(t, err)
+
+		vals, err := builder.Finalize()
+		assert.NoError(t, err)
+
+		str, err := vals.ToJSON()
+		assert.NoError(t, err)
+
+		err = vals.Free()
+		assert.NoError(t, err)
+
+		newVals, err := CredentialValuesFromJSON(str)
+		assert.NoError(t, err)
+		assert.NotNil(t, newVals)
 	})
 }