1 files changed, 39 insertions, 0 deletions
diff --git a/internal/feed/v2authentication.go b/internal/feed/v2authentication.go
new file mode 100644
index 0000000..853954f
--- /dev/null
+++ b/internal/feed/v2authentication.go
@@ -0,0 +1,39 @@
+package feed
+
+//go:generate stringer -linecomment -type=V2Authentication
+
+import (
+  "encoding/json"
+  "fmt"
+)
+
+// CVSS v2 authentication
+type V2Authentication byte
+
+const (
+  V2AuthNone V2Authentication = iota // NONE
+  V2AuthSingle // SINGLE
+)
+
+// Unmarshal CVSS V2 authentication from JSON.
+func (me *V2Authentication) UnmarshalJSON(b []byte) error {
+  // decode string, check for error
+  var s string
+  if err := json.Unmarshal(b, &s); err != nil {
+    return err
+  }
+
+  // check value
+  switch s {
+  case "NONE":
+    *me = V2AuthNone
+  case "SINGLE":
+    *me = V2AuthSingle
+  default:
+    // return error
+    return fmt.Errorf("unknown CVSS v2 authentication: %s", s)
+  }
+
+  // return success
+  return nil
+}