mostly finished db pages

pkg/permission/permission.go

@@ -0,0 +1,47 @@
+package permission
+
+type Permission int
+
+const (
+	Invalid Permission = iota
+	Public
+	Internal
+	Private
+)
+
+func Parse(p int) Permission {
+	switch p {
+	case Public:
+		return Public
+	case Internal:
+		return Internal
+	case Private:
+		return Private
+	}
+	return Invalid
+}
+
+func Read(username string, p *Page) bool {
+	switch p.Perm {
+	case Public:
+		return true
+	case Internal:
+		return username != ""
+	case Private:
+		return username == p.Owner
+	}
+	return false
+}
+
+func Write(username string, p *Page) bool {
+	switch p.Perm {
+	case Public, Internal:
+		if p.Owner == "" {
+			return username != ""
+		}
+		return username == p.Owner
+	case Private:
+		return username == p.Owner
+	}
+	return false
+}