1 files changed, 37 insertions, 0 deletions
diff --git a/entities/identity/common.go b/entities/identity/common.go
new file mode 100644
index 00000000..5c6445e9
--- /dev/null
+++ b/entities/identity/common.go
@@ -0,0 +1,37 @@
+package identity
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/MichaelMure/git-bug/entity"
+)
+
+var ErrIdentityNotExist = errors.New("identity doesn't exist")
+
+func NewErrMultipleMatch(matching []entity.Id) *entity.ErrMultipleMatch {
+	return entity.NewErrMultipleMatch("identity", matching)
+}
+
+// Custom unmarshaling function to allow package user to delegate
+// the decoding of an Identity and distinguish between an Identity
+// and a Bare.
+//
+// If the given message has a "id" field, it's considered being a proper Identity.
+func UnmarshalJSON(raw json.RawMessage) (Interface, error) {
+	aux := &IdentityStub{}
+
+	// First try to decode and load as a normal Identity
+	err := json.Unmarshal(raw, &aux)
+	if err == nil && aux.Id() != "" {
+		return aux, nil
+	}
+
+	// abort if we have an error other than the wrong type
+	if _, ok := err.(*json.UnmarshalTypeError); err != nil && !ok {
+		return nil, err
+	}
+
+	return nil, fmt.Errorf("unknown identity type")
+}