woodpecker/server/grpc/authorizer.go

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// Copyright 2023 Woodpecker Authors
//
// 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.
package grpc
import (
"context"
"fmt"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
type StreamContextWrapper interface {
grpc.ServerStream
SetContext(context.Context)
}
type wrapper struct {
grpc.ServerStream
ctx context.Context
}
func (w *wrapper) Context() context.Context {
return w.ctx
}
func (w *wrapper) SetContext(ctx context.Context) {
w.ctx = ctx
}
func newStreamContextWrapper(inner grpc.ServerStream) StreamContextWrapper {
ctx := inner.Context()
return &wrapper{
inner,
ctx,
}
}
type Authorizer struct {
jwtManager *JWTManager
}
func NewAuthorizer(jwtManager *JWTManager) *Authorizer {
return &Authorizer{jwtManager: jwtManager}
}
func (a *Authorizer) StreamInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
_stream := newStreamContextWrapper(stream)
newCtx, err := a.authorize(stream.Context(), info.FullMethod)
if err != nil {
return err
}
_stream.SetContext(newCtx)
return handler(srv, _stream)
}
func (a *Authorizer) UnaryInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
newCtx, err := a.authorize(ctx, info.FullMethod)
if err != nil {
return nil, err
}
return handler(newCtx, req)
}
func (a *Authorizer) authorize(ctx context.Context, fullMethod string) (context.Context, error) {
// bypass auth for token endpoint
if fullMethod == "/proto.WoodpeckerAuth/Auth" {
return ctx, nil
}
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return ctx, status.Errorf(codes.Unauthenticated, "metadata is not provided")
}
values := md["token"]
if len(values) == 0 {
return ctx, status.Errorf(codes.Unauthenticated, "token is not provided")
}
accessToken := values[0]
claims, err := a.jwtManager.Verify(accessToken)
if err != nil {
return ctx, status.Errorf(codes.Unauthenticated, "access token is invalid: %v", err)
}
md.Append("agent_id", fmt.Sprintf("%d", claims.AgentID))
return metadata.NewIncomingContext(ctx, md), nil
}