code.gitea.io/gitea@v1.22.3/services/auth/source/oauth2/store.go (about)

     1  // Copyright 2021 The Gitea Authors. All rights reserved.
     2  // SPDX-License-Identifier: MIT
     3  
     4  package oauth2
     5  
     6  import (
     7  	"encoding/gob"
     8  	"fmt"
     9  	"net/http"
    10  
    11  	"code.gitea.io/gitea/modules/log"
    12  	session_module "code.gitea.io/gitea/modules/session"
    13  
    14  	chiSession "gitea.com/go-chi/session"
    15  	"github.com/gorilla/sessions"
    16  )
    17  
    18  // SessionsStore creates a gothic store from our session
    19  type SessionsStore struct {
    20  	maxLength int64
    21  }
    22  
    23  // Get should return a cached session.
    24  func (st *SessionsStore) Get(r *http.Request, name string) (*sessions.Session, error) {
    25  	return st.getOrNew(r, name, false)
    26  }
    27  
    28  // New should create and return a new session.
    29  //
    30  // Note that New should never return a nil session, even in the case of
    31  // an error if using the Registry infrastructure to cache the session.
    32  func (st *SessionsStore) New(r *http.Request, name string) (*sessions.Session, error) {
    33  	return st.getOrNew(r, name, true)
    34  }
    35  
    36  // getOrNew gets the session from the chi-session if it exists. Override permits the overriding of an unexpected object.
    37  func (st *SessionsStore) getOrNew(r *http.Request, name string, override bool) (*sessions.Session, error) {
    38  	chiStore := chiSession.GetSession(r)
    39  
    40  	session := sessions.NewSession(st, name)
    41  
    42  	rawData := chiStore.Get(name)
    43  	if rawData != nil {
    44  		oldSession, ok := rawData.(*sessions.Session)
    45  		if ok {
    46  			session.ID = oldSession.ID
    47  			session.IsNew = oldSession.IsNew
    48  			session.Options = oldSession.Options
    49  			session.Values = oldSession.Values
    50  
    51  			return session, nil
    52  		} else if !override {
    53  			log.Error("Unexpected object in session at name: %s: %v", name, rawData)
    54  			return nil, fmt.Errorf("unexpected object in session at name: %s", name)
    55  		}
    56  	}
    57  
    58  	session.IsNew = override
    59  	session.ID = chiStore.ID() // Simply copy the session id from the chi store
    60  
    61  	return session, chiStore.Set(name, session)
    62  }
    63  
    64  // Save should persist session to the underlying store implementation.
    65  func (st *SessionsStore) Save(r *http.Request, w http.ResponseWriter, session *sessions.Session) error {
    66  	chiStore := chiSession.GetSession(r)
    67  
    68  	if session.IsNew {
    69  		_, _ = session_module.RegenerateSession(w, r)
    70  		session.IsNew = false
    71  	}
    72  
    73  	if err := chiStore.Set(session.Name(), session); err != nil {
    74  		return err
    75  	}
    76  
    77  	if st.maxLength > 0 {
    78  		sizeWriter := &sizeWriter{}
    79  
    80  		_ = gob.NewEncoder(sizeWriter).Encode(session)
    81  		if sizeWriter.size > st.maxLength {
    82  			return fmt.Errorf("encode session: Data too long: %d > %d", sizeWriter.size, st.maxLength)
    83  		}
    84  	}
    85  
    86  	return chiStore.Release()
    87  }
    88  
    89  type sizeWriter struct {
    90  	size int64
    91  }
    92  
    93  func (s *sizeWriter) Write(data []byte) (int, error) {
    94  	s.size += int64(len(data))
    95  	return len(data), nil
    96  }
    97  
    98  var _ (sessions.Store) = &SessionsStore{}