internal/feed: add v2impact, v3impact, and tests

1 files changed, 42 insertions, 0 deletions

diff --git a/internal/feed/v3impact.go b/internal/feed/v3impact.go
new file mode 100644
index 0000000..d6c450e
--- /dev/null
+++ b/internal/feed/v3impact.go
@@ -0,0 +1,42 @@
+package feed
+
+//go:generate stringer -linecomment -type=V3Impact
+
+import (
+  "encoding/json"
+  "fmt"
+)
+
+// CVSS v3 impact level.
+type V3Impact byte
+
+const (
+  V3ImpactNone V3Impact = iota // NONE
+  V3ImpactLow // LOW
+  V3ImpactHigh // HIGH
+)
+
+// Unmarshal CVSS v3 impact level from JSON.
+func (me *V3Impact) 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 = V3ImpactNone
+  case "LOW":
+    *me = V3ImpactLow
+  case "HIGH":
+    *me = V3ImpactHigh
+  default:
+    // return error
+    return fmt.Errorf("unknown CVSS v3 impact: %s", s)
+  }
+
+  // return success
+  return nil
+}