103 lines
2.0 KiB
Go
103 lines
2.0 KiB
Go
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package server
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import (
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"crypto/rand"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"github.com/dgrijalva/jwt-go"
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"github.com/khlieng/dispatch/storage"
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)
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func handleAuth(w http.ResponseWriter, r *http.Request) *Session {
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var session *Session
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cookie, err := r.Cookie(cookieName)
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if err != nil {
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authLog(r, "No cookie set")
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session = newUser(w, r)
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} else {
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token, err := jwt.Parse(cookie.Value, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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return hmacKey, nil
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})
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if err == nil && token.Valid {
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userID := uint64(token.Claims["UserID"].(float64))
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log.Println(r.RemoteAddr, "[Auth] GET", r.URL.Path, "| Valid token | User ID:", userID)
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sessionLock.Lock()
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session = sessions[userID]
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sessionLock.Unlock()
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} else {
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if err != nil {
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authLog(r, "Invalid token: "+err.Error())
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} else {
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authLog(r, "Invalid token")
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}
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session = newUser(w, r)
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}
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}
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return session
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}
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func newUser(w http.ResponseWriter, r *http.Request) *Session {
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user := storage.NewUser()
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if user == nil {
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return nil
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}
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log.Println(r.RemoteAddr, "[Auth] Create session | User ID:", user.ID)
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session := NewSession(user)
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sessionLock.Lock()
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sessions[user.ID] = session
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sessionLock.Unlock()
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go session.write()
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token := jwt.New(jwt.SigningMethodHS256)
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token.Claims["UserID"] = user.ID
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tokenString, err := token.SignedString(hmacKey)
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if err != nil {
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return nil
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}
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http.SetCookie(w, &http.Cookie{
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Name: cookieName,
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Value: tokenString,
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Path: "/",
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HttpOnly: true,
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Secure: r.TLS != nil,
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})
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return session
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}
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func getHMACKey() ([]byte, error) {
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key, err := ioutil.ReadFile(storage.Path.HMACKey())
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if err != nil {
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key = make([]byte, 32)
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rand.Read(key)
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err = ioutil.WriteFile(storage.Path.HMACKey(), key, 0600)
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if err != nil {
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return nil, err
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}
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}
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return key, nil
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}
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func authLog(r *http.Request, s string) {
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log.Println(r.RemoteAddr, "[Auth] GET", r.URL.Path, "|", s)
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}
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