Allow colons in the name component of resource IDs

flux.go

@@ -13,9 +13,14 @@ import (
 var (
 	ErrInvalidServiceID = errors.New("invalid service ID")
 
-	LegacyServiceIDRegexp       = regexp.MustCompile("^([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)$")
-	ResourceIDRegexp            = regexp.MustCompile("^([a-zA-Z0-9_-]+):([a-zA-Z0-9_-]+)/([a-zA-Z0-9_.-]+)$")
-	UnqualifiedResourceIDRegexp = regexp.MustCompile("^([a-zA-Z0-9_-]+)/([a-zA-Z0-9_.-]+)$")
+	LegacyServiceIDRegexp = regexp.MustCompile("^([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)$")
+	// The namespace and name commponents are (apparently
+	// non-normatively) defined in
+	// https://github.com/kubernetes/community/blob/master/contributors/design-proposals/architecture/identifiers.md
+	// In practice, more punctuation is used than allowed there;
+	// specifically, people use underscores as well as dashes and dots, and in names, colons.
+	ResourceIDRegexp            = regexp.MustCompile("^([a-zA-Z0-9_-]+):([a-zA-Z0-9_-]+)/([a-zA-Z0-9_.:-]+)$")
+	UnqualifiedResourceIDRegexp = regexp.MustCompile("^([a-zA-Z0-9_-]+)/([a-zA-Z0-9_.:-]+)$")
 )
 
 // ResourceID is an opaque type which uniquely identifies a resource in an

resourceid_test.go

@@ -0,0 +1,38 @@
+package flux
+
+import (
+	"testing"
+)
+
+func TestResourceIDParsing(t *testing.T) {
+	type test struct {
+		name, id string
+	}
+	valid := []test{
+		{"full", "namespace:kind/name"},
+		{"legacy", "namespace/service"},
+		{"dots", "namespace:kind/name.with.dots"},
+		{"colons", "namespace:kind/name:with:colons"},
+		{"punctuation in general", "name-space:ki_nd/punc_tu:a.tion-rules"},
+	}
+	invalid := []test{
+		{"unqualified", "justname"},
+		{"dots in namespace", "name.space:kind/name"},
+		{"too many colons", "namespace:kind:name"},
+	}
+
+	for _, tc := range valid {
+		t.Run(tc.name, func(t *testing.T) {
+			if _, err := ParseResourceID(tc.id); err != nil {
+				t.Error(err)
+			}
+		})
+	}
+	for _, tc := range invalid {
+		t.Run(tc.name, func(t *testing.T) {
+			if _, err := ParseResourceID(tc.id); err == nil {
+				t.Errorf("expected %q to be considered invalid", tc.id)
+			}
+		})
+	}
+}