internal/feed: add v2version, v3version, tests

1 files changed, 36 insertions, 0 deletions

diff --git a/internal/feed/v2version.go b/internal/feed/v2version.go
new file mode 100644
index 0000000..76e6134
--- /dev/null
+++ b/internal/feed/v2version.go
@@ -0,0 +1,36 @@
+package feed
+
+//go:generate stringer -linecomment -type=V2Version
+
+import (
+  "encoding/json"
+  "fmt"
+)
+
+// CVSS v2 version
+type V2Version byte
+
+const (
+  V20 V2Version = iota // 2.0
+)
+
+// Unmarshal CVSS V2 version from JSON.
+func (me *V2Version) 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 "2.0":
+    *me = V20
+  default:
+    // return error
+    return fmt.Errorf("unknown CVSS version: %s", s)
+  }
+
+  // return success
+  return nil
+}