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session.go
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session.go
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package main
import (
"bytes"
"encoding/gob"
"errors"
"log"
"time"
"github.com/chances/chances-party/models"
"github.com/garyburd/redigo/redis"
raven "github.com/getsentry/raven-go"
"github.com/gin-gonic/gin"
"github.com/twinj/uuid"
"github.com/vattle/sqlboiler/queries/qm"
)
const (
sessionDefaultKey = "github.com/chances/chances-party/session"
)
var (
pool *redis.Pool
)
func newRedisPool() *redis.Pool {
newPool := &redis.Pool{
MaxActive: 10,
MaxIdle: 2,
IdleTimeout: 120 * time.Second,
Dial: func() (redis.Conn, error) {
return redis.DialURL(getenvOrFatal("REDIS_URL"))
},
}
return newPool
}
func partySession() gin.HandlerFunc {
return func(c *gin.Context) {
s := loadSession(c)
c.Set(sessionDefaultKey, s)
// Try to get the session's user
currentUsername, err := s.Get("USER")
if err == nil {
existingUser, err := models.UsersG(qm.Where("username = ?", currentUsername)).One()
if err == nil {
c.Set("user", existingUser)
}
}
// If the session has a user, associate it with Sentry
if IsLoggedIn(c) {
user := CurrentUser(c)
raven.SetUserContext(&raven.User{
ID: string(user.ID),
Username: user.Username,
})
}
maxAge := 60 * 60 * 12 // 12 hours
if gin.IsDebugging() {
c.SetCookie(s.name, s.ID, maxAge, "", "", false, true)
} else {
c.SetCookie(s.name, s.ID, maxAge, "", ".chancesnow.me", true, false)
}
c.Next()
}
}
func redisGet(key string) (string, error) {
c := pool.Get()
defer c.Close()
value, err := redis.String(c.Do("GET", key))
if err != nil {
println(err.Error())
log.Printf("Could not GET %s\n", key)
return "", err
}
return value, nil
}
func redisSet(key string, value string) error {
c := pool.Get()
defer c.Close()
// status, err
_, err := c.Do("SET", key, value)
if err != nil {
println(err.Error())
log.Printf("Could not SET %s:%s\n", key, value)
return err
}
return nil
}
// Session is a hella simple strng value session store for chances-party
type Session struct {
name string
ID string
flashes map[string]interface{}
}
func loadSession(c *gin.Context) *Session {
cookie, err := c.Cookie("cpSESSION")
if err != nil {
id := uuid.NewV4().String()
flashes := make(map[string]interface{})
return &Session{"cpSESSION", id, flashes}
}
return &Session{"cpSESSION", cookie, loadFlashes(cookie)}
}
// TODO: Serialize session into JSON
func loadFlashes(id string) map[string]interface{} {
c := pool.Get()
defer c.Close()
value, err := redis.Bytes(c.Do("GET", id+":flashes"))
if err != nil {
return make(map[string]interface{})
}
var flashes map[string]interface{}
flashesBuffer := bytes.NewBuffer(value)
dec := gob.NewDecoder(flashesBuffer)
err = dec.Decode(&flashes)
if err != nil {
return make(map[string]interface{})
}
return flashes
}
func (s *Session) saveFlashes() {
if s.flashes == nil {
return
}
flashesBuffer := new(bytes.Buffer)
enc := gob.NewEncoder(flashesBuffer)
err := enc.Encode(s.flashes)
if err != nil {
log.Fatal("cp flash:", err)
}
c := pool.Get()
defer c.Close()
// status, err
_, err = c.Do("SET", s.ID+":flashes", flashesBuffer.Bytes())
if err != nil {
log.Fatal("cp flash:", err)
}
}
// Get returns the session value associated to the given key.
func (s *Session) Get(key string) (string, error) {
value, err := redisGet(s.ID + ":" + key)
if err != nil {
return "", err
}
return value, nil
}
// Set sets the session value associated to the given key.
func (s *Session) Set(key string, value string) error {
err := redisSet(s.ID+":"+key, value)
if err != nil {
return err
}
return nil
}
// Flash a keyed value to session flash storage
func (s *Session) Flash(key string, value interface{}) {
s.flashes[key] = value
s.saveFlashes()
}
// Flashes retrieves values from session flash storage
func (s *Session) Flashes(key ...string) ([]interface{}, error) {
numKeys := len(key)
if numKeys == 0 {
flashes := s.flashes
val := make([]interface{}, len(flashes))
idx := 0
for _, value := range flashes {
val[idx] = value
idx++
}
s.flashes = make(map[string]interface{})
s.saveFlashes()
return val, nil
} else if numKeys == 1 {
if val, ok := s.flashes[key[0]]; ok {
valResult := make([]interface{}, 1)
valResult[0] = val
delete(s.flashes, key[0])
s.saveFlashes()
return valResult, nil
}
return make([]interface{}, 0), nil
}
return nil, errors.New("Flashes accepts only zero or one keys")
}
// Error retrieves an error from session flash storage
func (s *Session) Error() (string, error) {
errors, err := s.Flashes("error")
if err != nil {
return "", err
}
if len(errors) > 0 {
return errors[0].(string), nil
}
return "", nil
}
// Delete removes the session value associated to the given key.
func (s *Session) Delete(key string) error {
c := pool.Get()
defer c.Close()
_, err := c.Do("DEL", s.ID+":"+key)
if err != nil {
println(err.Error())
log.Printf("Could not DEL %s\n", key)
return err
}
return nil
}
// DefaultSession shortcut to get the session
func DefaultSession(c *gin.Context) *Session {
return c.MustGet(sessionDefaultKey).(*Session)
}
// IsLoggedIn checks if a user is logged in to the session
func IsLoggedIn(c *gin.Context) bool {
_, hasUser := c.Get("user")
return hasUser
}
// CurrentUser shortcut to get the current session's user
func CurrentUser(c *gin.Context) *models.User {
return c.MustGet("user").(*models.User)
}