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auth.go
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auth.go
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//go:build !js
// +build !js
package kivikd
import (
"net/http"
"github.com/go-kivik/kivik/v4/x/kivikd/auth"
"github.com/go-kivik/kivik/v4/x/kivikd/authdb"
)
type doneWriter struct {
http.ResponseWriter
done bool
}
func (w *doneWriter) WriteHeader(status int) {
w.done = true
w.ResponseWriter.WriteHeader(status)
}
func (w *doneWriter) Write(b []byte) (int, error) {
w.done = true
return w.ResponseWriter.Write(b)
}
func authHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
dw := &doneWriter{ResponseWriter: w}
s := GetService(r)
session, err := s.validate(dw, r)
if err != nil {
reportError(w, err)
return
}
sessionPtr := mustGetSessionPtr(r.Context())
*sessionPtr = session
if dw.done {
// The auth handler already responded to the request
return
}
next.ServeHTTP(w, r)
})
}
// validate must return a 401 error if there is an authentication failure.
// No error means the user is permitted.
func (s *Service) validate(w http.ResponseWriter, r *http.Request) (*auth.Session, error) {
if s.authHandlers == nil {
// Perpetual admin party
return s.createSession("", &authdb.UserContext{Roles: []string{"_admin"}}), nil
}
for methodName, handler := range s.authHandlers {
uCtx, err := handler.Authenticate(w, r)
if err != nil {
return nil, err
}
if uCtx != nil {
return s.createSession(methodName, uCtx), nil
}
}
// None of the auth methods succeeded, so return unauthorized
return s.createSession("", nil), nil
}
func (s *Service) createSession(method string, user *authdb.UserContext) *auth.Session {
return &auth.Session{
AuthMethod: method,
AuthDB: s.Conf().GetString("couch_httpd_auth.authentication_db"),
Handlers: s.authHandlerNames,
User: user,
}
}