Split Sessions into models

internal/models/sessions.go

@@ -0,0 +1,67 @@
+package models
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type Session struct {
+	SessionId     int64
+	SessionSecret string `json:"-"`
+	UserId        int64
+	Created       time.Time
+	Expires       time.Time
+}
+
+func (s *Session) Cookie(domain string) *http.Cookie {
+	return &http.Cookie{
+		Name:     "moneygo-session",
+		Value:    s.SessionSecret,
+		Path:     "/",
+		Domain:   domain,
+		Expires:  s.Expires,
+		Secure:   true,
+		HttpOnly: true,
+	}
+}
+
+func (s *Session) Write(w http.ResponseWriter) error {
+	enc := json.NewEncoder(w)
+	return enc.Encode(s)
+}
+
+func (s *Session) Read(json_str string) error {
+	dec := json.NewDecoder(strings.NewReader(json_str))
+	return dec.Decode(s)
+}
+
+func newSessionSecret() (string, error) {
+	bits := make([]byte, 128)
+	if _, err := io.ReadFull(rand.Reader, bits); err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(bits), nil
+}
+
+func NewSession(userid int64) (*Session, error) {
+	session_secret, err := newSessionSecret()
+	if err != nil {
+		return nil, err
+	}
+
+	now := time.Now()
+
+	s := Session{
+		SessionSecret: session_secret,
+		UserId:        userid,
+		Created:       now,
+		Expires:       now.AddDate(0, 1, 0), // a month from now
+	}
+
+	return &s, nil
+}