From 49c3a04637c4846e460bda6b00cdc4c542ddb668 Mon Sep 17 00:00:00 2001
From: Victor Vrantchan <vrancean+github@gmail.com>
Date: Sat, 25 Jul 2020 20:38:59 -0400
Subject: [PATCH] Create viewer package.

The "viewer" is the user/authenticated session browsing the site.
---
 pkg/viewer/viewr.go | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 pkg/viewer/viewr.go

diff --git a/pkg/viewer/viewr.go b/pkg/viewer/viewr.go
new file mode 100644
index 00000000..46424bb2
--- /dev/null
+++ b/pkg/viewer/viewr.go
@@ -0,0 +1,27 @@
+// Package viewer provides utility functions for passing the current user to a context.
+package viewer
+
+import "context"
+
+type key int
+
+const viewerKey key = 0
+
+// Viewer represents a user performing an action on the server.
+type Viewer struct {
+	UserID    string
+	Username  string
+	FullName  string
+	SessionID string
+}
+
+// FromContext returns the current user information if present.
+func FromContext(ctx context.Context) (Viewer, bool) {
+	v, ok := ctx.Value(viewerKey).(Viewer)
+	return v, ok
+}
+
+// NewContext updates the parent context with viewer information.
+func NewContext(ctx context.Context, v Viewer) context.Context {
+	return context.WithValue(ctx, viewerKey, v)
+}