internal/feed: split out datatype, add tests

1 files changed, 36 insertions, 0 deletions

diff --git a/internal/feed/datatype.go b/internal/feed/datatype.go
new file mode 100644
index 0000000..6eaa145
--- /dev/null
+++ b/internal/feed/datatype.go
@@ -0,0 +1,36 @@
+package feed
+
+//go:generate stringer -linecomment -type=DataType
+
+import (
+  "encoding/json"
+  "fmt"
+)
+
+// Data type for NVD feeds and feed items.
+type DataType byte
+
+const (
+  CveType DataType = iota // CVE
+)
+
+// Unmarshal DataType from JSON.
+func (me *DataType) 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 "CVE":
+    *me = CveType
+  default:
+    // return error
+    return fmt.Errorf("unknown data type: %s", s)
+  }
+
+  // return success
+  return nil
+}