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- package koushin
-
- import (
- "fmt"
- "io/ioutil"
- "mime"
- "net/http"
- "net/url"
- "strings"
- "time"
-
- imapclient "github.com/emersion/go-imap/client"
- "github.com/labstack/echo/v4"
- )
-
- const cookieName = "koushin_session"
-
- type Server struct {
- imap struct {
- host string
- tls bool
- insecure bool
-
- pool *ConnPool
- }
-
- smtp struct {
- host string
- tls bool
- insecure bool
- }
- }
-
- 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
- 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 fmt.Errorf("failed to put connection in pool: %v", err)
- }
- ctx.setToken(token)
-
- return ctx.Redirect(http.StatusFound, "/mailbox/INBOX")
- }
-
- return ctx.Render(http.StatusOK, "login.html", nil)
- }
-
- func handleGetPart(ctx *context, raw bool) error {
- mboxName := ctx.Param("mbox")
- uid, err := parseUid(ctx.Param("uid"))
- if err != nil {
- return echo.NewHTTPError(http.StatusBadRequest, err)
- }
- partPathString := ctx.QueryParam("part")
- partPath, err := parsePartPath(partPathString)
- if err != nil {
- return echo.NewHTTPError(http.StatusBadRequest, err)
- }
-
- msg, part, err := getMessagePart(ctx.conn, mboxName, uid, partPath)
- if err != nil {
- return err
- }
-
- mimeType, _, err := part.Header.ContentType()
- if err != nil {
- return fmt.Errorf("failed to parse part Content-Type: %v", err)
- }
- if len(partPath) == 0 {
- mimeType = "message/rfc822"
- }
-
- if raw {
- disp, dispParams, _ := part.Header.ContentDisposition()
- filename := dispParams["filename"]
-
- if !strings.EqualFold(mimeType, "text/plain") || strings.EqualFold(disp, "attachment") {
- dispParams := make(map[string]string)
- if filename != "" {
- dispParams["filename"] = filename
- }
- disp := mime.FormatMediaType("attachment", dispParams)
- ctx.Response().Header().Set("Content-Disposition", disp)
- }
- return ctx.Stream(http.StatusOK, mimeType, part.Body)
- }
-
- var body string
- if strings.HasPrefix(strings.ToLower(mimeType), "text/") {
- b, err := ioutil.ReadAll(part.Body)
- if err != nil {
- return fmt.Errorf("failed to read part body: %v", err)
- }
- body = string(b)
- }
-
- return ctx.Render(http.StatusOK, "message.html", map[string]interface{}{
- "Mailbox": ctx.conn.Mailbox(),
- "Message": msg,
- "Body": body,
- "PartPath": partPathString,
- })
- }
-
- func handleCompose(ectx echo.Context) error {
- ctx := ectx.(*context)
- return ctx.Render(http.StatusOK, "compose.html", nil)
- }
-
- func New(imapURL, smtpURL string) *echo.Echo {
- e := echo.New()
-
- s, err := NewServer(imapURL, smtpURL)
- if err != nil {
- e.Logger.Fatal(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}
-
- 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("/mailbox/:mbox", func(ectx echo.Context) error {
- ctx := ectx.(*context)
-
- mailboxes, err := listMailboxes(ctx.conn)
- if err != nil {
- return err
- }
-
- msgs, err := listMessages(ctx.conn, ctx.Param("mbox"))
- if err != nil {
- return err
- }
-
- return ctx.Render(http.StatusOK, "mailbox.html", map[string]interface{}{
- "Mailbox": ctx.conn.Mailbox(),
- "Mailboxes": mailboxes,
- "Messages": msgs,
- })
- })
-
- 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", func(ectx echo.Context) error {
- ctx := ectx.(*context)
- if err := ctx.conn.Logout(); err != nil {
- return fmt.Errorf("failed to logout: %v", err)
- }
- ctx.setToken("")
- return ctx.Redirect(http.StatusFound, "/login")
- })
-
- e.GET("/compose", handleCompose)
- e.POST("/compose", handleCompose)
-
- e.Static("/assets", "public/assets")
-
- return e
- }
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