@@ -1,12 +1,22 @@ | |||
package main | |||
import ( | |||
"fmt" | |||
"os" | |||
"git.sr.ht/~emersion/koushin" | |||
"github.com/labstack/echo/v4/middleware" | |||
) | |||
func main() { | |||
e := koushin.New() | |||
if len(os.Args) != 2 { | |||
fmt.Println("usage: koushin imaps://<host>:<port>") | |||
return | |||
} | |||
url := os.Args[1] | |||
e := koushin.New(url) | |||
e.Use(middleware.Logger()) | |||
e.Use(middleware.Recover()) | |||
e.Logger.Fatal(e.Start(":1323")) | |||
@@ -0,0 +1,58 @@ | |||
package koushin | |||
import ( | |||
"crypto/rand" | |||
"encoding/base64" | |||
"errors" | |||
imapclient "github.com/emersion/go-imap/client" | |||
) | |||
func generateToken() (string, error) { | |||
b := make([]byte, 32) | |||
_, err := rand.Read(b) | |||
if err != nil { | |||
return "", err | |||
} | |||
return base64.URLEncoding.EncodeToString(b), nil | |||
} | |||
var ErrSessionExpired = errors.New("session expired") | |||
// TODO: expiration timer | |||
type ConnPool struct { | |||
// TODO: add synchronization | |||
conns map[string]*imapclient.Client | |||
} | |||
func NewConnPool() *ConnPool { | |||
return &ConnPool{ | |||
conns: make(map[string]*imapclient.Client), | |||
} | |||
} | |||
func (pool *ConnPool) Get(token string) (*imapclient.Client, error) { | |||
conn, ok := pool.conns[token] | |||
if !ok { | |||
return nil, ErrSessionExpired | |||
} | |||
return conn, nil | |||
} | |||
func (pool *ConnPool) Put(conn *imapclient.Client) (token string, err error) { | |||
for { | |||
var err error | |||
token, err = generateToken() | |||
if err != nil { | |||
conn.Logout() | |||
return "", err | |||
} | |||
if _, ok := pool.conns[token]; !ok { | |||
break | |||
} | |||
} | |||
pool.conns[token] = conn | |||
return token, nil | |||
} |
@@ -2,4 +2,7 @@ module git.sr.ht/~emersion/koushin | |||
go 1.13 | |||
require github.com/labstack/echo/v4 v4.1.11 | |||
require ( | |||
github.com/emersion/go-imap v1.0.1 | |||
github.com/labstack/echo/v4 v4.1.11 | |||
) |
@@ -1,11 +1,18 @@ | |||
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | |||
github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM= | |||
github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ= | |||
github.com/emersion/go-imap v1.0.1 h1:J3duplefIrglQtE63hCGYdGLgMjYWqHvkUUEbimbXY8= | |||
github.com/emersion/go-imap v1.0.1/go.mod h1:MEiDDwwQFcZ+L45Pa68jNGv0qU9kbW+SJzwDpvSfX1s= | |||
github.com/emersion/go-message v0.10.4-0.20190609165112-592ace5bc1ca/go.mod h1:3h+HsGTCFHmk4ngJ2IV/YPhdlaOcR6hcgqM3yca9v7c= | |||
github.com/emersion/go-sasl v0.0.0-20190520160400-47d427600317 h1:tYZxAY8nu3JJQKios9f27Sbvbkfm4XHXT476gVtszu0= | |||
github.com/emersion/go-sasl v0.0.0-20190520160400-47d427600317/go.mod h1:G/dpzLu16WtQpBfQ/z3LYiYJn3ZhKSGWn83fyoyQe/k= | |||
github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U= | |||
github.com/labstack/echo v3.3.10+incompatible h1:pGRcYk231ExFAyoAjAfD85kQzRJCRI8bbnE7CX5OEgg= | |||
github.com/labstack/echo/v4 v4.1.11 h1:z0BZoArY4FqdpUEl+wlHp4hnr/oSR6MTmQmv8OHSoww= | |||
github.com/labstack/echo/v4 v4.1.11/go.mod h1:i541M3Fj6f76NZtHSj7TXnyM8n2gaodfvfxNnFqi74g= | |||
github.com/labstack/gommon v0.3.0 h1:JEeO0bvc78PKdyHxloTKiF8BD5iGrH8T6MSeGvSgob0= | |||
github.com/labstack/gommon v0.3.0/go.mod h1:MULnywXg0yavhxWKc+lOruYdAhDwPK9wf0OL7NoOu+k= | |||
github.com/martinlindhe/base36 v0.0.0-20190418230009-7c6542dfbb41/go.mod h1:+AtEs8xrBpCeYgSLoY/aJ6Wf37jtBuR0s35750M27+8= | |||
github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU= | |||
github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE= | |||
github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s= | |||
@@ -30,5 +37,8 @@ golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO | |||
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= | |||
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= | |||
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= | |||
golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs= | |||
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk= | |||
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= | |||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= | |||
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= |
@@ -0,0 +1,14 @@ | |||
{{template "head"}} | |||
<h1>koushin</h1> | |||
<form method="post" action="/login"> | |||
<p>Username:</p> | |||
<input type="text" name="username"> | |||
<p>Password:</p> | |||
<input type="password" name="password"> | |||
<br><br> | |||
<input type="submit" value="Login"> | |||
</form> | |||
{{template "foot"}} |
@@ -1,24 +1,171 @@ | |||
package koushin | |||
import ( | |||
"fmt" | |||
"net/http" | |||
"net/url" | |||
"time" | |||
"github.com/labstack/echo/v4" | |||
imapclient "github.com/emersion/go-imap/client" | |||
) | |||
func New() *echo.Echo { | |||
e := echo.New() | |||
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 { | |||
return next(ctx) | |||
} 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(c echo.Context) error { | |||
return c.Render(http.StatusOK, "index.html", nil) | |||
e.GET("/", func(ectx echo.Context) error { | |||
ctx := ectx.(*context) | |||
if ctx.conn == nil { | |||
return ctx.Redirect(http.StatusFound, "/login") | |||
} | |||
return ctx.Render(http.StatusOK, "index.html", nil) | |||
}) | |||
e.GET("/login", handleLogin) | |||
e.POST("/login", handleLogin) | |||
e.Static("/assets", "public/assets") | |||
return e | |||