Version 3 starter

backend/internal/api/context/context.go

@@ -0,0 +1,25 @@
+package context
+
+var (
+	// BodyCtxKey is the name of the Body value on the context
+	BodyCtxKey = &contextKey{"Body"}
+	// UserIDCtxKey is the name of the UserID value on the context
+	UserIDCtxKey = &contextKey{"UserID"}
+	// FiltersCtxKey is the name of the Filters value on the context
+	FiltersCtxKey = &contextKey{"Filters"}
+	// PrettyPrintCtxKey is the name of the pretty print context
+	PrettyPrintCtxKey = &contextKey{"Pretty"}
+	// ExpansionCtxKey is the name of the expansion context
+	ExpansionCtxKey = &contextKey{"Expansion"}
+)
+
+// contextKey is a value for use with context.WithValue. It's used as
+// a pointer so it fits in an interface{} without allocation. This technique
+// for defining context keys was copied from Go 1.7's new use of context in net/http.
+type contextKey struct {
+	name string
+}
+
+func (k *contextKey) String() string {
+	return "context value: " + k.name
+}