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session.go
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session.go
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package middleware
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
firebase "firebase.google.com/go"
"firebase.google.com/go/auth"
"github.com/aquilax/truncate"
"github.com/dopedao/dope-monorepo/packages/api/internal/logger"
"github.com/gorilla/sessions"
"github.com/jiulongw/siwe-go"
)
const Key = "session"
const firebaseSigninURL string = "https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyCustomToken?key="
var apikey string = os.Getenv("FIREBASE_API_KEY")
type sessionContextKey struct{}
var Store = NewCookieStore([]byte("session_secret"))
var sessionCtxKey = &sessionContextKey{}
type SessionContext struct {
W http.ResponseWriter
R *http.Request
S sessions.Store
}
func (sc *SessionContext) Get(name string) (*sessions.Session, error) {
return sc.S.Get(sc.R, name)
}
func (sc *SessionContext) Save(ss *sessions.Session) error {
return sc.S.Save(sc.R, sc.W, ss)
}
func NewCookieStore(keyPairs ...[]byte) sessions.Store {
store := sessions.NewCookieStore(keyPairs...)
store.Options.Path = "/"
return store
}
func WithStore(ctx context.Context, s sessions.Store, r *http.Request, w http.ResponseWriter) context.Context {
return context.WithValue(ctx, sessionCtxKey, SessionContext{S: s, R: r, W: w})
}
func SessionFor(ctx context.Context) SessionContext {
return ctx.Value(sessionCtxKey).(SessionContext)
}
// IsAuthenticated.
func IsAuthenticated(ctx context.Context, client *auth.Client) bool {
_, log := logger.LogFor(ctx)
log.Debug().
Str("Client", fmt.Sprintf("%v", client)).
Str("Context", fmt.Sprintf("%v", ctx)).
Msg("Start Auth")
jwtIDToken, err := Token(ctx)
if err != nil {
log.Err(err).Msg("JWT session IDToken not found")
return false
}
if err := FirebaseVerify(ctx, client, jwtIDToken); err != nil {
log.Err(err).Msgf("verify error")
return false
}
return true
}
// Store WalletAddress and JWT Token from firebase in session.
func SetWalletAndToken(ctx context.Context, walletAddress string, jwtToken string) error {
sc := SessionFor(ctx)
_, log := logger.LogFor(ctx)
log.Debug().Str("Wallet", walletAddress).Msg("SetWallet")
session, err := sc.Get(Key)
if err != nil {
return err
}
session.Values["wallet"] = walletAddress
session.Values["token"] = jwtToken
if err := sc.Save(session); err != nil {
return err
}
return nil
}
// FirebaseAuth authenticate a user.
func FirebaseAuth(ctx context.Context, client *auth.Client, wallet string) (string, error) {
// Check if the user exists using the wallet address (UID = Wallet)
_, log := logger.LogFor(ctx)
if _, err := client.GetUser(ctx, wallet); err != nil {
// User not found create a new user here with ETH UID
log.Debug().Msg("create new firebase user")
params := (&auth.UserToCreate{}).UID(wallet)
user, err := client.CreateUser(context.TODO(), params)
if err != nil {
return "", err
}
log.Debug().Msgf("Successfully created user with Ethereum address: %v\n", user.UID)
}
// Create custom token for the user with claims.
claims := map[string]interface{}{
"wallet": wallet,
}
token, err := client.CustomTokenWithClaims(context.TODO(), wallet, claims)
if err != nil {
return "", err
}
log.Debug().
Str("Claims", fmt.Sprintf("%v", claims)).
// Str("Token", token).
Msg("Got token")
if apikey == "" {
return "", fmt.Errorf("no api key provided")
}
url := firebaseSigninURL + apikey
log.Debug().Msgf("signin URL %v\n", url)
jsonBody := struct {
Token string `json:"token"`
ReturnSecureToken bool `json:"returnSecureToken"`
}{token, true}
data, err := json.Marshal(jsonBody)
if err != nil {
return "", err
}
body := bytes.NewBuffer(data)
req, err := http.NewRequest(http.MethodPost, url, body)
if err != nil {
return "", err
}
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
data, err = io.ReadAll(resp.Body)
if err != nil {
return "", err
}
log.Debug().
Str("data", string(data)).
Msg("data")
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("failed to sign in user [%v] [%v]", resp.StatusCode, string(data))
}
signInResp := struct {
IdToken string `json:"idToken"`
ExpiresIn string `json:"expiresIn"`
}{}
if err := json.Unmarshal(data, &signInResp); err != nil {
return "", err
}
log.Debug().Msgf("token = %v", signInResp.IdToken)
return signInResp.IdToken, nil
}
// FirebaseInit returns a firebase auth client or an error if it fails.
func FirebaseInit(ctx context.Context) (*auth.Client, error) {
_, log := logger.LogFor(ctx)
log.Debug().Msg("initialization of firebase")
app, err := firebase.NewApp(context.Background(), nil)
if err != nil {
return nil, fmt.Errorf("error initializing app: %v", err)
}
return app.Auth(context.TODO())
}
// FirebaseVerify verifies whether the custom token exists and not expired.
func FirebaseVerify(ctx context.Context, client *auth.Client, sessionCookie string) error {
_, log := logger.LogFor(ctx)
log.Debug().Msg("verification")
if _, err := client.VerifyIDTokenAndCheckRevoked(ctx, sessionCookie); err != nil {
log.Debug().Msgf("Verify Error %v", err)
return err
}
// Authentication successful
log.Debug().Msg("auth successful")
return nil
}
// Session "wallet" should contain wallet address of user
func Wallet(ctx context.Context) (string, error) {
_, log := logger.LogFor(ctx)
sc := SessionFor(ctx)
session, err := sc.Get(Key)
if err != nil {
return "", err
}
walletAddress := session.Values["wallet"]
log.Debug().
Str("wallet", fmt.Sprintf("%v", walletAddress)).
Msg("middleware.Wallet")
return walletAddress.(string), nil
}
// Returns stored JWT IDToken from session
func Token(ctx context.Context) (string, error) {
_, log := logger.LogFor(ctx)
sc := SessionFor(ctx)
session, err := sc.Get(Key)
if err != nil {
return "", err
}
token := session.Values["token"]
if token == nil {
return "", errors.New("unauthorized")
}
truncatedIDToken := truncate.Truncate(token.(string), 10, "...", truncate.PositionEnd)
log.Debug().
Str("Session Token", truncatedIDToken).
Msg("middleware.Token")
return token.(string), nil
}
func SetSiwe(ctx context.Context, message string) error {
sc := SessionFor(ctx)
session, err := sc.Get(Key)
if err != nil {
return err
}
session.Values["siwe"] = message
if err := sc.Save(session); err != nil {
return err
}
return nil
}
func Siwe(ctx context.Context) (*siwe.Message, error) {
sc := SessionFor(ctx)
session, err := sc.Get(Key)
if err != nil {
return nil, err
}
siweMessage := session.Values["siwe"]
if siweMessage == nil {
return nil, errors.New("unauthorized")
}
parsedMessage, err := siwe.MessageFromString(siweMessage.(string))
if err != nil {
return nil, err
}
return parsedMessage, nil
}
func Session(store sessions.Store) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), sessionCtxKey, SessionContext{w, r, store})
r = r.WithContext(ctx)
next.ServeHTTP(w, r)
})
}
}
func Clear(ctx context.Context) error {
sc := ctx.Value(sessionCtxKey).(SessionContext)
session, err := sc.Get(Key)
if err != nil {
return err
}
session.Options.MaxAge = -1
if err := sc.Save(session); err != nil {
return err
}
return nil
}