108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
// Copyright 2023 Woodpecker Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package grpc
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import (
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"context"
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"fmt"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/status"
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)
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type StreamContextWrapper interface {
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grpc.ServerStream
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SetContext(context.Context)
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}
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type wrapper struct {
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grpc.ServerStream
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ctx context.Context
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}
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func (w *wrapper) Context() context.Context {
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return w.ctx
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}
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func (w *wrapper) SetContext(ctx context.Context) {
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w.ctx = ctx
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}
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func newStreamContextWrapper(inner grpc.ServerStream) StreamContextWrapper {
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ctx := inner.Context()
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return &wrapper{
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inner,
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ctx,
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}
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}
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type Authorizer struct {
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jwtManager *JWTManager
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}
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func NewAuthorizer(jwtManager *JWTManager) *Authorizer {
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return &Authorizer{jwtManager: jwtManager}
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}
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func (a *Authorizer) StreamInterceptor(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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_stream := newStreamContextWrapper(stream)
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newCtx, err := a.authorize(stream.Context(), info.FullMethod)
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if err != nil {
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return err
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}
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_stream.SetContext(newCtx)
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return handler(srv, _stream)
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}
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func (a *Authorizer) UnaryInterceptor(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp any, err error) {
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newCtx, err := a.authorize(ctx, info.FullMethod)
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if err != nil {
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return nil, err
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}
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return handler(newCtx, req)
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}
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func (a *Authorizer) authorize(ctx context.Context, fullMethod string) (context.Context, error) {
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// bypass auth for token endpoint
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if fullMethod == "/proto.WoodpeckerAuth/Auth" {
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return ctx, nil
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}
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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return ctx, status.Errorf(codes.Unauthenticated, "metadata is not provided")
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}
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values := md["token"]
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if len(values) == 0 {
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return ctx, status.Errorf(codes.Unauthenticated, "token is not provided")
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}
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accessToken := values[0]
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claims, err := a.jwtManager.Verify(accessToken)
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if err != nil {
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return ctx, status.Errorf(codes.Unauthenticated, "access token is invalid: %v", err)
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}
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md.Append("agent_id", fmt.Sprintf("%d", claims.AgentID))
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return metadata.NewIncomingContext(ctx, md), nil
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}
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