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package koushin
import (
"fmt"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/labstack/echo/v4"
)
const cookieName = "koushin_session"
// Server holds all the koushin server state.
type Server struct {
e *echo.Echo
Sessions *SessionManager
mutex sync.RWMutex // used for server reload
plugins []Plugin
imap struct {
host string
tls bool
insecure bool
}
smtp struct {
host string
tls bool
insecure bool
}
defaultTheme string
}
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 (s *Server) load() error {
plugins := append([]Plugin(nil), plugins...)
for _, p := range plugins {
s.e.Logger.Printf("Registered plugin '%v'", p.Name())
}
luaPlugins, err := loadAllLuaPlugins(s.e.Logger)
if err != nil {
return fmt.Errorf("failed to load plugins: %v", err)
}
plugins = append(plugins, luaPlugins...)
renderer := newRenderer(s.e.Logger, s.defaultTheme)
if err := renderer.Load(plugins); err != nil {
return fmt.Errorf("failed to load templates: %v", err)
}
// Once we've loaded plugins and templates from disk (which can take time),
// swap them in the Server struct
s.mutex.Lock()
defer s.mutex.Unlock()
s.plugins = plugins
s.e.Renderer = renderer
for _, p := range plugins {
p.SetRoutes(s.e.Group(""))
}
return nil
}
// Reload loads Lua plugins and templates from disk.
func (s *Server) Reload() error {
s.e.Logger.Printf("Reloading server")
return s.load()
}
func newServer(e *echo.Echo, options *Options) (*Server, error) {
s := &Server{e: e, defaultTheme: options.Theme}
if err := s.parseIMAPURL(options.IMAPURL); err != nil {
return nil, err
}
if options.SMTPURL != "" {
if err := s.parseSMTPURL(options.SMTPURL); err != nil {
return nil, err
}
}
s.Sessions = newSessionManager(s.dialIMAP, s.dialSMTP)
return s, nil
}
// Context is the context used by HTTP handlers.
//
// Use a type assertion to get it from a echo.Context:
//
// ctx := ectx.(*koushin.Context)
type Context struct {
echo.Context
Server *Server
Session *Session // nil if user isn't logged in
}
var aLongTimeAgo = time.Unix(233431200, 0)
// SetSession sets a cookie for the provided session. Passing a nil session
// unsets the cookie.
func (ctx *Context) SetSession(s *Session) {
cookie := http.Cookie{
Name: cookieName,
HttpOnly: true,
// TODO: domain, secure
}
if s != nil {
cookie.Value = s.token
} else {
cookie.Expires = aLongTimeAgo // unset the cookie
}
ctx.SetCookie(&cookie)
}
func isPublic(path string) bool {
if strings.HasPrefix(path, "/plugins/") {
parts := strings.Split(path, "/")
return len(parts) >= 4 && parts[3] == "assets"
}
return path == "/login" || strings.HasPrefix(path, "/themes/")
}
type Options struct {
IMAPURL, SMTPURL string
Theme string
}
// New creates a new server.
func New(e *echo.Echo, options *Options) (*Server, error) {
s, err := newServer(e, options)
if err != nil {
return nil, err
}
if err := s.load(); err != nil {
return nil, 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.Pre(func(next echo.HandlerFunc) echo.HandlerFunc {
return func(ectx echo.Context) error {
s.mutex.RLock()
err := next(ectx)
s.mutex.RUnlock()
return err
}
})
e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
return func(ectx echo.Context) error {
ectx.Response().Header().Set("Content-Security-Policy", "default-src 'self'")
return next(ectx)
}
})
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.Sessions.get(cookie.Value)
if err == errSessionExpired {
ctx.SetSession(nil)
return ctx.Redirect(http.StatusFound, "/login")
} else if err != nil {
return err
}
ctx.Session.ping()
return next(ctx)
}
})
e.Static("/themes", "themes")
return s, nil
}
|
