Implement initial login functionality

pkg/cancel/values.go

@@ -0,0 +1,24 @@
+package cancel
+
+import "context"
+
+// ValuesOf returns a new context that has the same deadline and cancelation behviour as parent.
+// However when requesting values from the context, checks the values in context first.
+func ValuesOf(parent, values context.Context) context.Context {
+	return &valuesOf{
+		Context: parent,
+		values:  values,
+	}
+}
+
+type valuesOf struct {
+	context.Context
+	values context.Context
+}
+
+func (vv *valuesOf) Value(key any) any {
+	if value := vv.values.Value(key); value != nil {
+		return value
+	}
+	return vv.Context.Value(key)
+}