Adding upstream version 9.0.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>

1 files changed, 225 insertions, 0 deletions

diff --git a/modules/session/redis.go b/modules/session/redis.go
new file mode 100644
index 0000000..230b501
--- /dev/null
+++ b/modules/session/redis.go
@@ -0,0 +1,225 @@
+// Copyright 2013 Beego Authors
+// Copyright 2014 The Macaron Authors
+// Copyright 2020 The Gitea Authors. All rights reserved.
+//
+// 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.
+// SPDX-License-Identifier: Apache-2.0
+
+package session
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/nosql"
+
+	"code.forgejo.org/go-chi/session"
+)
+
+// RedisStore represents a redis session store implementation.
+type RedisStore struct {
+	c           nosql.RedisClient
+	prefix, sid string
+	duration    time.Duration
+	lock        sync.RWMutex
+	data        map[any]any
+}
+
+// NewRedisStore creates and returns a redis session store.
+func NewRedisStore(c nosql.RedisClient, prefix, sid string, dur time.Duration, kv map[any]any) *RedisStore {
+	return &RedisStore{
+		c:        c,
+		prefix:   prefix,
+		sid:      sid,
+		duration: dur,
+		data:     kv,
+	}
+}
+
+// Set sets value to given key in session.
+func (s *RedisStore) Set(key, val any) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.data[key] = val
+	return nil
+}
+
+// Get gets value by given key in session.
+func (s *RedisStore) Get(key any) any {
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+
+	return s.data[key]
+}
+
+// Delete delete a key from session.
+func (s *RedisStore) Delete(key any) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	delete(s.data, key)
+	return nil
+}
+
+// ID returns current session ID.
+func (s *RedisStore) ID() string {
+	return s.sid
+}
+
+// Release releases resource and save data to provider.
+func (s *RedisStore) Release() error {
+	// Skip encoding if the data is empty
+	if len(s.data) == 0 {
+		return nil
+	}
+
+	data, err := session.EncodeGob(s.data)
+	if err != nil {
+		return err
+	}
+
+	return s.c.Set(graceful.GetManager().HammerContext(), s.prefix+s.sid, string(data), s.duration).Err()
+}
+
+// Flush deletes all session data.
+func (s *RedisStore) Flush() error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.data = make(map[any]any)
+	return nil
+}
+
+// RedisProvider represents a redis session provider implementation.
+type RedisProvider struct {
+	c        nosql.RedisClient
+	duration time.Duration
+	prefix   string
+}
+
+// Init initializes redis session provider.
+// configs: network=tcp,addr=:6379,password=macaron,db=0,pool_size=100,idle_timeout=180,prefix=session;
+func (p *RedisProvider) Init(maxlifetime int64, configs string) (err error) {
+	p.duration, err = time.ParseDuration(fmt.Sprintf("%ds", maxlifetime))
+	if err != nil {
+		return err
+	}
+
+	uri := nosql.ToRedisURI(configs)
+
+	for k, v := range uri.Query() {
+		if k == "prefix" {
+			p.prefix = v[0]
+		}
+	}
+
+	p.c = nosql.GetManager().GetRedisClient(uri.String())
+	return p.c.Ping(graceful.GetManager().ShutdownContext()).Err()
+}
+
+// Read returns raw session store by session ID.
+func (p *RedisProvider) Read(sid string) (session.RawStore, error) {
+	psid := p.prefix + sid
+	if !p.Exist(sid) {
+		if err := p.c.Set(graceful.GetManager().HammerContext(), psid, "", p.duration).Err(); err != nil {
+			return nil, err
+		}
+	}
+
+	var kv map[any]any
+	kvs, err := p.c.Get(graceful.GetManager().HammerContext(), psid).Result()
+	if err != nil {
+		return nil, err
+	}
+	if len(kvs) == 0 {
+		kv = make(map[any]any)
+	} else {
+		kv, err = session.DecodeGob([]byte(kvs))
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return NewRedisStore(p.c, p.prefix, sid, p.duration, kv), nil
+}
+
+// Exist returns true if session with given ID exists.
+func (p *RedisProvider) Exist(sid string) bool {
+	v, err := p.c.Exists(graceful.GetManager().HammerContext(), p.prefix+sid).Result()
+	return err == nil && v == 1
+}
+
+// Destroy deletes a session by session ID.
+func (p *RedisProvider) Destroy(sid string) error {
+	return p.c.Del(graceful.GetManager().HammerContext(), p.prefix+sid).Err()
+}
+
+// Regenerate regenerates a session store from old session ID to new one.
+func (p *RedisProvider) Regenerate(oldsid, sid string) (_ session.RawStore, err error) {
+	poldsid := p.prefix + oldsid
+	psid := p.prefix + sid
+
+	if p.Exist(sid) {
+		return nil, fmt.Errorf("new sid '%s' already exists", sid)
+	} else if !p.Exist(oldsid) {
+		// Make a fake old session.
+		if err = p.c.Set(graceful.GetManager().HammerContext(), poldsid, "", p.duration).Err(); err != nil {
+			return nil, err
+		}
+	}
+
+	// do not use Rename here, because the old sid and new sid may be in different redis cluster slot.
+	kvs, err := p.c.Get(graceful.GetManager().HammerContext(), poldsid).Result()
+	if err != nil {
+		return nil, err
+	}
+
+	if err = p.c.Del(graceful.GetManager().HammerContext(), poldsid).Err(); err != nil {
+		return nil, err
+	}
+
+	if err = p.c.Set(graceful.GetManager().HammerContext(), psid, kvs, p.duration).Err(); err != nil {
+		return nil, err
+	}
+
+	var kv map[any]any
+	if len(kvs) == 0 {
+		kv = make(map[any]any)
+	} else {
+		kv, err = session.DecodeGob([]byte(kvs))
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return NewRedisStore(p.c, p.prefix, sid, p.duration, kv), nil
+}
+
+// Count counts and returns number of sessions.
+func (p *RedisProvider) Count() int {
+	size, err := p.c.DBSize(graceful.GetManager().HammerContext()).Result()
+	if err != nil {
+		return 0
+	}
+	return int(size)
+}
+
+// GC calls GC to clean expired sessions.
+func (*RedisProvider) GC() {}
+
+func init() {
+	session.Register("redis", &RedisProvider{})
+}