69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package main
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"time"
|
|
)
|
|
|
|
var PongSecret = "felixfixit"
|
|
|
|
func init() {
|
|
router.GET("/api/students/:sid/ping", apiHandler(studentHandler(isPinging)))
|
|
router.GET("/api/students/:sid/pong", apiHandler(studentHandler(func (student Student, body []byte) (interface{}, error) {
|
|
return student.lastPongs()
|
|
})))
|
|
router.POST("/api/students/:sid/pong", apiHandler(studentHandler(stdPong), sslOnly))
|
|
}
|
|
|
|
func isPinging(student Student, body []byte) (interface{}, error) {
|
|
if pongs, err := student.lastPongs(); err != nil {
|
|
return nil, err
|
|
} else if len(pongs) <= 0 {
|
|
return false, nil
|
|
} else {
|
|
return time.Now().Before(pongs[0].Add(time.Second * 90)), nil
|
|
}
|
|
}
|
|
|
|
func (s Student) lastPongs() (pongs []time.Time, err error) {
|
|
if rows, errr := DBQuery("SELECT time FROM student_pong WHERE id_student = ? ORDER BY time DESC", s.Id); errr != nil {
|
|
return nil, errr
|
|
} else {
|
|
defer rows.Close()
|
|
|
|
for rows.Next() {
|
|
var t time.Time
|
|
if err = rows.Scan(&t); err != nil {
|
|
return
|
|
}
|
|
pongs = append(pongs, t)
|
|
}
|
|
if err = rows.Err(); err != nil {
|
|
return
|
|
}
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
func stdPong(student Student, body []byte) (interface{}, error) {
|
|
var gt givenToken
|
|
if err := json.Unmarshal(body, >); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if gt.Token != PongSecret {
|
|
return nil, errors.New("This is not the expected token.")
|
|
}
|
|
|
|
|
|
if res, err := DBExec("INSERT INTO student_pong (id_student, time) VALUES (?, ?)", student.Id, time.Now()); err != nil {
|
|
return false, err
|
|
} else if _, err := res.LastInsertId(); err != nil {
|
|
return false, err
|
|
} else {
|
|
return true, err
|
|
}
|
|
}
|