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- 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
- }
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