edge/pkg/module/auth/middleware/anonymous_user.go

118 lines
3.3 KiB
Go

package middleware
import (
"crypto/rand"
"fmt"
"math/big"
"net/http"
"time"
"forge.cadoles.com/arcad/edge/pkg/jwtutil"
"forge.cadoles.com/arcad/edge/pkg/module/auth"
"github.com/google/uuid"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
const AnonIssuer = "anon"
func AnonymousUser(key jwk.Key, signingAlgorithm jwa.SignatureAlgorithm, funcs ...AnonymousUserOptionFunc) func(next http.Handler) http.Handler {
opts := defaultAnonymousUserOptions()
for _, fn := range funcs {
fn(opts)
}
return func(next http.Handler) http.Handler {
handler := func(w http.ResponseWriter, r *http.Request) {
rawToken, err := jwtutil.FindRawToken(r, jwtutil.WithFinders(
jwtutil.FindTokenFromAuthorizationHeader,
jwtutil.FindTokenFromQueryString(auth.CookieName),
jwtutil.FindTokenFromCookie(auth.CookieName),
))
// If request already has a raw token, we do nothing
if rawToken != "" && err == nil {
next.ServeHTTP(w, r)
return
}
ctx := r.Context()
uuid, err := uuid.NewUUID()
if err != nil {
logger.Error(ctx, "could not generate uuid for anonymous user", logger.CapturedE(errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
subject := fmt.Sprintf("%s-%s", AnonIssuer, uuid.String())
preferredUsername, err := generateRandomPreferredUsername(8)
if err != nil {
logger.Error(ctx, "could not generate preferred username for anonymous user", logger.CapturedE(errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
claims := map[string]any{
auth.ClaimSubject: subject,
auth.ClaimIssuer: AnonIssuer,
auth.ClaimPreferredUsername: preferredUsername,
auth.ClaimEdgeRole: opts.Role,
auth.ClaimEdgeEntrypoint: opts.Entrypoint,
auth.ClaimEdgeTenant: opts.Tenant,
}
token, err := jwtutil.SignedToken(key, signingAlgorithm, claims)
if err != nil {
logger.Error(ctx, "could not generate signed token", logger.CapturedE(errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
cookieDomain, err := opts.GetCookieDomain(r)
if err != nil {
logger.Error(ctx, "could not retrieve cookie domain", logger.CapturedE(errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
cookie := http.Cookie{
Name: auth.CookieName,
Value: string(token),
Domain: cookieDomain,
HttpOnly: false,
Expires: time.Now().Add(opts.CookieDuration),
Path: "/",
}
http.SetCookie(w, &cookie)
next.ServeHTTP(w, r)
}
return http.HandlerFunc(handler)
}
}
func generateRandomPreferredUsername(size int) (string, error) {
var letters = []rune("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
max := big.NewInt(int64(len(letters)))
b := make([]rune, size)
for i := range b {
idx, err := rand.Int(rand.Reader, max)
if err != nil {
return "", errors.WithStack(err)
}
b[i] = letters[idx.Int64()]
}
return fmt.Sprintf("Anon %s", string(b)), nil
}