Login via OpenID-2.0 (#618)

modules/auth/openid/discovery_cache.go

@@ -0,0 +1,59 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package openid
+
+import (
+	"sync"
+	"time"
+
+	"github.com/yohcop/openid-go"
+)
+
+type timedDiscoveredInfo struct {
+	info openid.DiscoveredInfo
+	time time.Time
+}
+
+type timedDiscoveryCache struct {
+	cache map[string]timedDiscoveredInfo
+	ttl time.Duration
+	mutex *sync.Mutex
+}
+
+func newTimedDiscoveryCache(ttl time.Duration) *timedDiscoveryCache {
+	return &timedDiscoveryCache{cache: map[string]timedDiscoveredInfo{}, ttl: ttl, mutex: &sync.Mutex{}}
+}
+
+func (s *timedDiscoveryCache) Put(id string, info openid.DiscoveredInfo) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	s.cache[id] = timedDiscoveredInfo{info: info, time: time.Now()}
+}
+
+// Delete timed-out cache entries
+func (s *timedDiscoveryCache) cleanTimedOut() {
+	now := time.Now()
+	for k, e := range s.cache {
+		diff := now.Sub(e.time)
+		if diff > s.ttl {
+			delete(s.cache, k)
+		}
+	}
+}
+
+func (s *timedDiscoveryCache) Get(id string) openid.DiscoveredInfo {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	// Delete old cached while we are at it.
+	s.cleanTimedOut()
+
+	if info, has := s.cache[id]; has {
+		return info.info
+	}
+	return nil
+}
+