Migrate remaining configuration documents to ConfigKit

internal/config/document_configkit.go

@@ -0,0 +1,32 @@
+package config
+
+import (
+	"fmt"
+
+	configkit "gitea.maximumdirect.net/eric/ConfigKit"
+)
+
+const maxConfigDocumentBytes int64 = 8 << 20
+
+func loadCampaignWithConfigKit(path string) (*CampaignConfig, error) {
+	result, err := configkit.Load(configkit.File(path), configkit.Options[CampaignConfig]{
+		Definition: configkit.Definition[CampaignConfig]{},
+	})
+	if err != nil {
+		return nil, describeConfigKitLoadError("campaign", err)
+	}
+	return &result.Config, nil
+}
+
+func loadSessionWithConfigKit(label string, data []byte) (*SessionConfig, error) {
+	if int64(len(data)) > maxConfigDocumentBytes {
+		return nil, fmt.Errorf("load session config: session file %q exceeds %d-byte limit", label, maxConfigDocumentBytes)
+	}
+	result, err := configkit.Load(configkit.Bytes(label, data), configkit.Options[SessionConfig]{
+		Definition: configkit.Definition[SessionConfig]{},
+	})
+	if err != nil {
+		return nil, describeConfigKitLoadError("session", err)
+	}
+	return &result.Config, nil
+}