4 files changed, 148 insertions, 31 deletions
diff --git a/internal/feed/feed.go b/internal/feed/feed.go
index aa5fd08..56fc7d2 100644
--- a/internal/feed/feed.go
+++ b/internal/feed/feed.go
@@ -19,36 +19,7 @@ const (
   Single          // Single authentication
 )
 
-// TODO: parse cpe
-
-// CVSS V2 attack complexity
-type AccessComplexity int
-
-// Unmarshal CVSS V2 access complexity from JSON.
-func (me *AccessComplexity) 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 "LOW":
-    *me = Low
-  case "MEDIUM":
-    *me = Medium
-  case "HIGH":
-    *me = High
-  default:
-    // return error
-    return fmt.Errorf("unknown access complexity: %s", s)
-  }
-
-  // return success
-  return nil
-}
-
+// TODO: parse cpe, cve id
 
 // CVSS V2 authentication
 type Authentication int
@@ -293,7 +264,7 @@ type CvssV2 struct {
   AccessVector V2AccessVector `json:"accessVector"`
 
   // attack complexity
-  AccessComplexity AccessComplexity `json:"accessComplexity"`
+  AccessComplexity V2AccessComplexity `json:"accessComplexity"`
 
   // authentication
   Authentication Authentication `json:"authentication"`
diff --git a/internal/feed/v2accesscomplexity.go b/internal/feed/v2accesscomplexity.go
new file mode 100644
index 0000000..5885e0d
--- /dev/null
+++ b/internal/feed/v2accesscomplexity.go
@@ -0,0 +1,42 @@
+package feed
+
+//go:generate stringer -linecomment -type=V2AccessComplexity
+
+import (
+  "encoding/json"
+  "fmt"
+)
+
+// CVSS v2 access complexity
+type V2AccessComplexity byte
+
+const (
+  V2ACLow V2AccessComplexity = iota // LOW
+  V2ACMedium // MEDIUM
+  V2ACHigh // HIGH
+)
+
+// Unmarshal CVSS V2 access complexity from JSON.
+func (me *V2AccessComplexity) 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 "LOW":
+    *me = V2ACLow
+  case "MEDIUM":
+    *me = V2ACMedium
+  case "HIGH":
+    *me = V2ACHigh
+  default:
+    // return error
+    return fmt.Errorf("unknown CVSS v2 access complexity: %s", s)
+  }
+
+  // return success
+  return nil
+}
diff --git a/internal/feed/v2accesscomplexity_string.go b/internal/feed/v2accesscomplexity_string.go
new file mode 100644
index 0000000..8638b3d
--- /dev/null
+++ b/internal/feed/v2accesscomplexity_string.go
@@ -0,0 +1,25 @@
+// Code generated by "stringer -linecomment -type=V2AccessComplexity"; DO NOT EDIT.
+
+package feed
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[V2ACLow-0]
+	_ = x[V2ACMedium-1]
+	_ = x[V2ACHigh-2]
+}
+
+const _V2AccessComplexity_name = "LOWMEDIUMHIGH"
+
+var _V2AccessComplexity_index = [...]uint8{0, 3, 9, 13}
+
+func (i V2AccessComplexity) String() string {
+	if i >= V2AccessComplexity(len(_V2AccessComplexity_index)-1) {
+		return "V2AccessComplexity(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _V2AccessComplexity_name[_V2AccessComplexity_index[i]:_V2AccessComplexity_index[i+1]]
+}
diff --git a/internal/feed/v2accesscomplexity_test.go b/internal/feed/v2accesscomplexity_test.go
new file mode 100644
index 0000000..2dd173d
--- /dev/null
+++ b/internal/feed/v2accesscomplexity_test.go
@@ -0,0 +1,79 @@
+package feed
+
+import (
+  "encoding/json"
+  "testing"
+)
+
+func TestV2AccessComplexityUnmarshalInvalidData(t *testing.T) {
+  test := []byte(`{}`)
+  var val V2AccessComplexity
+
+  if err := json.Unmarshal(test, &val); err == nil {
+    t.Errorf("got \"%s\", exp error", val)
+  }
+}
+
+func TestV2AccessComplexityUnmarshalUnknown(t *testing.T) {
+  test := []byte(`"foo"`)
+  exp := "unknown CVSS v2 access complexity: foo"
+  var val V2AccessComplexity
+
+  err := json.Unmarshal(test, &val)
+  if err == nil {
+    t.Errorf("got \"%s\", exp error", val)
+    return
+  }
+
+  if err.Error() != exp {
+    t.Errorf("got \"%s\", exp \"%s\"", err.Error(), exp)
+  }
+}
+
+func TestV2AccessComplexityUnmarshalValid(t *testing.T) {
+  tests := []struct {
+    val string
+    exp V2AccessComplexity
+  } {
+    { "\"LOW\"", V2ACLow },
+    { "\"MEDIUM\"", V2ACMedium },
+    { "\"HIGH\"", V2ACHigh },
+  }
+
+  for _, test := range(tests) {
+    t.Run(test.val, func(t *testing.T) {
+      var got V2AccessComplexity
+      if err := json.Unmarshal([]byte(test.val), &got); err != nil {
+        t.Error(err)
+        return
+      }
+
+      if got != test.exp {
+        t.Errorf("got \"%s\", exp \"%s\"", got, test.exp)
+      }
+    })
+  }
+}
+
+func TestV2AccessComplexityString(t *testing.T) {
+  tests := []struct {
+    val V2AccessComplexity
+    exp string
+  } {
+    { V2ACLow, "LOW" },
+    { V2ACMedium, "MEDIUM" },
+    { V2ACHigh, "HIGH" },
+
+    { V2AccessComplexity(255), "V2AccessComplexity(255)" },
+  }
+
+  for _, test := range(tests) {
+    t.Run(test.exp, func(t *testing.T) {
+      got := test.val.String()
+
+      if got != test.exp {
+        t.Errorf("got \"%s\", exp \"%s\"", got, test.exp)
+      }
+    })
+  }
+}