token-validator: add routes to display predefined IPs on challenge LAN

token-validator/ip.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func init() {
+	router.GET("/api/ips", apiHandler(showIPs))
+	router.GET("/api/students/:sid/ips", apiHandler(studentHandler(showStudentIPs)))
+}
+
+func (s Student) IPSuffix() int64 {
+	return s.Id * 5 + 10
+}
+
+func showIPs(_ httprouter.Params, body []byte) (interface{}, error) {
+	r := make(map[string]map[string]string)
+
+	students, err := getStudents()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, std := range students {
+		r[std.Login] = make(map[string]string)
+
+		r[std.Login]["vlan0"] = fmt.Sprintf("172.23.0.%d", std.IPSuffix())
+		r[std.Login]["vlan7"] = fmt.Sprintf("172.23.142.%d", std.IPSuffix())
+	}
+
+	return r, nil
+}
+
+func showStudentIPs(student Student, body []byte) (interface{}, error) {
+	r := make(map[string]string)
+
+	r["vlan0"] = fmt.Sprintf("172.23.0.%d", student.IPSuffix())
+	r["vlan7"] = fmt.Sprintf("172.23.142.%d", student.IPSuffix())
+
+	return r, nil
+}