[#535] Support public access block operations

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

api/cache/policy.go

@@ -44,7 +44,7 @@ func NewMorphPolicyCache(config *Config) *MorphPolicyCache {
 	return &MorphPolicyCache{cache: gc, logger: config.Logger}
 }
 
-// Get returns a cached object. Returns nil if value is missing.
+// Get returns cached chains. Returns nil if value is missing.
 func (o *MorphPolicyCache) Get(key MorphPolicyCacheKey) []*chain.Chain {
 	entry, err := o.cache.Get(key)
 	if err != nil {
@@ -61,12 +61,39 @@ func (o *MorphPolicyCache) Get(key MorphPolicyCacheKey) []*chain.Chain {
 	return result
 }
 
-// Put puts an object to cache.
+// Put puts chains to cache.
 func (o *MorphPolicyCache) Put(key MorphPolicyCacheKey, list []*chain.Chain) error {
 	return o.cache.Set(key, list)
 }
 
-// Delete deletes an object from cache.
+// Delete deletes chains from cache.
 func (o *MorphPolicyCache) Delete(key MorphPolicyCacheKey) bool {
 	return o.cache.Remove(key)
 }
+
+// GetBucketPolicy returns cached bucket policy. Returns nil if value is missing.
+func (o *MorphPolicyCache) GetBucketPolicy(name string) []byte {
+	entry, err := o.cache.Get(name)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.([]byte)
+	if !ok {
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
+			zap.String("expected", fmt.Sprintf("%T", result)), logs.TagField(logs.TagDatapath))
+		return nil
+	}
+
+	return result
+}
+
+// PutBucketPolicy puts bucket policy to cache.
+func (o *MorphPolicyCache) PutBucketPolicy(name string, policy []byte) error {
+	return o.cache.Set(name, policy)
+}
+
+// DeleteBucketPolicy deletes bucket policy from cache.
+func (o *MorphPolicyCache) DeleteBucketPolicy(name string) bool {
+	return o.cache.Remove(name)
+}