package koushin import ( "fmt" "net/http" "net/url" "strings" "time" "github.com/labstack/echo/v4" ) const cookieName = "koushin_session" const messagesPerPage = 50 type Server struct { imap struct { host string tls bool insecure bool pool *ConnPool } smtp struct { host string tls bool insecure bool } plugins []Plugin } func (s *Server) parseIMAPURL(imapURL string) error { u, err := url.Parse(imapURL) if err != nil { return fmt.Errorf("failed to parse IMAP server URL: %v", err) } 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 fmt.Errorf("unrecognized IMAP URL scheme: %s", u.Scheme) } return nil } func (s *Server) parseSMTPURL(smtpURL string) error { u, err := url.Parse(smtpURL) if err != nil { return fmt.Errorf("failed to parse SMTP server URL: %v", err) } s.smtp.host = u.Host switch u.Scheme { case "smtp": // This space is intentionally left blank case "smtps": s.smtp.tls = true case "smtp+insecure": s.smtp.insecure = true default: return fmt.Errorf("unrecognized SMTP URL scheme: %s", u.Scheme) } return nil } func newServer(imapURL, smtpURL string) (*Server, error) { s := &Server{} if err := s.parseIMAPURL(imapURL); err != nil { return nil, err } s.imap.pool = NewConnPool() if smtpURL != "" { if err := s.parseSMTPURL(smtpURL); err != nil { return nil, err } } return s, nil } type context struct { echo.Context server *Server session *Session } 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 isPublic(path string) bool { return path == "/login" || strings.HasPrefix(path, "/assets/") || strings.HasPrefix(path, "/themes/") } type Options struct { IMAPURL, SMTPURL string Theme string } func New(e *echo.Echo, options *Options) error { s, err := newServer(options.IMAPURL, options.SMTPURL) if err != nil { return err } e.Renderer, err = loadTemplates(e.Logger, options.Theme) if err != nil { return fmt.Errorf("failed to load templates: %v", err) } s.plugins, err = loadAllLuaPlugins(e.Logger) if err != nil { return fmt.Errorf("failed to load plugins: %v", err) } e.HTTPErrorHandler = func(err error, c echo.Context) { code := http.StatusInternalServerError if he, ok := err.(*echo.HTTPError); ok { code = he.Code } else { c.Logger().Error(err) } // TODO: hide internal errors c.String(code, err.Error()) } e.Use(func(next echo.HandlerFunc) echo.HandlerFunc { return func(ectx echo.Context) error { ctx := &context{Context: ectx, server: s} ctx.Set("context", ctx) cookie, err := ctx.Cookie(cookieName) if err == http.ErrNoCookie { // Require auth for all pages except /login if isPublic(ctx.Path()) { return next(ctx) } else { return ctx.Redirect(http.StatusFound, "/login") } } else if err != nil { return err } ctx.session, 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.GET("/mailbox/:mbox", handleGetMailbox) e.GET("/message/:mbox/:uid", func(ectx echo.Context) error { ctx := ectx.(*context) return handleGetPart(ctx, false) }) e.GET("/message/:mbox/:uid/raw", func(ectx echo.Context) error { ctx := ectx.(*context) return handleGetPart(ctx, true) }) e.GET("/login", handleLogin) e.POST("/login", handleLogin) e.GET("/logout", handleLogout) e.GET("/compose", handleCompose) e.POST("/compose", handleCompose) e.GET("/message/:mbox/:uid/reply", handleCompose) e.POST("/message/:mbox/:uid/reply", handleCompose) e.Static("/assets", "public/assets") e.Static("/themes", "public/themes") return nil }