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useragent.go
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useragent.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package useragent
import (
"context"
ctxpkg "github.com/cs3org/reva/v2/pkg/ctx"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// NewUnary returns a new unary interceptor that adds
// the useragent to the context.
func NewUnary() grpc.UnaryServerInterceptor {
interceptor := func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
if md, ok := metadata.FromIncomingContext(ctx); ok {
if lst, ok := md[ctxpkg.UserAgentHeader]; ok && len(lst) != 0 {
ctx = metadata.AppendToOutgoingContext(ctx, ctxpkg.UserAgentHeader, lst[0])
}
}
return handler(ctx, req)
}
return interceptor
}
// NewStream returns a new server stream interceptor
// that adds the user agent to the context.
func NewStream() grpc.StreamServerInterceptor {
interceptor := func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
ctx := ss.Context()
if md, ok := metadata.FromIncomingContext(ctx); ok {
if lst, ok := md[ctxpkg.UserAgentHeader]; ok && len(lst) != 0 {
ctx = metadata.AppendToOutgoingContext(ctx, ctxpkg.UserAgentHeader, lst[0])
}
}
wrapped := newWrappedServerStream(ctx, ss)
return handler(srv, wrapped)
}
return interceptor
}
func newWrappedServerStream(ctx context.Context, ss grpc.ServerStream) *wrappedServerStream {
return &wrappedServerStream{ServerStream: ss, newCtx: ctx}
}
type wrappedServerStream struct {
grpc.ServerStream
newCtx context.Context
}
func (ss *wrappedServerStream) Context() context.Context {
return ss.newCtx
}