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package koushin
import (
"fmt"
"net/http"
"net/url"
"time"
"github.com/labstack/echo/v4"
"github.com/emersion/go-imap"
imapclient "github.com/emersion/go-imap/client"
)
const cookieName = "koushin_session"
type Server struct {
imap struct {
host string
tls bool
insecure bool
pool *ConnPool
}
}
func NewServer(imapURL string) (*Server, error) {
u, err := url.Parse(imapURL)
if err != nil {
return nil, err
}
s := &Server{}
s.imap.host = u.Host
switch u.Scheme {
case "imap":
// This space is intentionally left blank
case "imaps":
s.imap.tls = true
case "imap+insecure":
s.imap.insecure = true
default:
return nil, fmt.Errorf("unrecognized IMAP URL scheme: %s", u.Scheme)
}
s.imap.pool = NewConnPool()
return s, nil
}
func (s *Server) connectIMAP() (*imapclient.Client, error) {
var c *imapclient.Client
var err error
if s.imap.tls {
c, err = imapclient.DialTLS(s.imap.host, nil)
if err != nil {
return nil, err
}
} else {
c, err = imapclient.Dial(s.imap.host)
if err != nil {
return nil, err
}
if !s.imap.insecure {
if err := c.StartTLS(nil); err != nil {
c.Close()
return nil, err
}
}
}
return c, err
}
type context struct {
echo.Context
server *Server
conn *imapclient.Client
}
var aLongTimeAgo = time.Unix(233431200, 0)
func (c *context) setToken(token string) {
cookie := http.Cookie{
Name: cookieName,
Value: token,
HttpOnly: true,
// TODO: domain, secure
}
if token == "" {
cookie.Expires = aLongTimeAgo // unset the cookie
}
c.SetCookie(&cookie)
}
func handleLogin(ectx echo.Context) error {
ctx := ectx.(*context)
username := ctx.FormValue("username")
password := ctx.FormValue("password")
if username != "" && password != "" {
conn, err := ctx.server.connectIMAP()
if err != nil {
return err
}
if err := conn.Login(username, password); err != nil {
conn.Logout()
return ctx.Render(http.StatusOK, "login.html", nil)
}
token, err := ctx.server.imap.pool.Put(conn)
if err != nil {
return err
}
ctx.setToken(token)
return ctx.Redirect(http.StatusFound, "/")
}
return ctx.Render(http.StatusOK, "login.html", nil)
}
func New(imapURL string) *echo.Echo {
e := echo.New()
s, err := NewServer(imapURL)
if err != nil {
e.Logger.Fatal(err)
}
e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
return func(ectx echo.Context) error {
ctx := &context{Context: ectx, server: s}
cookie, err := ctx.Cookie(cookieName)
if err == http.ErrNoCookie {
// Require auth for all pages except /login
if ctx.Path() == "/login" {
return next(ctx)
} else {
return ctx.Redirect(http.StatusFound, "/login")
}
} else if err != nil {
return err
}
ctx.conn, err = ctx.server.imap.pool.Get(cookie.Value)
if err == ErrSessionExpired {
ctx.setToken("")
return ctx.Redirect(http.StatusFound, "/login")
} else if err != nil {
return err
}
return next(ctx)
}
})
e.Renderer, err = loadTemplates()
if err != nil {
e.Logger.Fatal("Failed to load templates:", err)
}
e.GET("/", func(ectx echo.Context) error {
ctx := ectx.(*context)
ch := make(chan *imap.MailboxInfo, 10)
done := make(chan error, 1)
go func () {
done <- ctx.conn.List("", "*", ch)
}()
var mailboxes []*imap.MailboxInfo
for mbox := range ch {
mailboxes = append(mailboxes, mbox)
}
if err := <-done; err != nil {
return err
}
return ctx.Render(http.StatusOK, "index.html", map[string]interface{}{
"Mailboxes": mailboxes,
})
})
e.GET("/login", handleLogin)
e.POST("/login", handleLogin)
e.Static("/assets", "public/assets")
return e
}
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