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https://github.com/woodpecker-ci/woodpecker.git
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115 lines
2.9 KiB
Go
115 lines
2.9 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 rpc
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import (
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"context"
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"time"
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"github.com/rs/zerolog/log"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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)
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// AuthInterceptor is a client interceptor for authentication.
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type AuthInterceptor struct {
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authClient *AuthClient
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accessToken string
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}
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// NewAuthInterceptor returns a new auth interceptor.
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func NewAuthInterceptor(ctx context.Context, authClient *AuthClient, refreshDuration time.Duration) (*AuthInterceptor, error) {
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interceptor := &AuthInterceptor{
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authClient: authClient,
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}
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err := interceptor.scheduleRefreshToken(ctx, refreshDuration)
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if err != nil {
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return nil, err
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}
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return interceptor, nil
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}
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// Unary returns a client interceptor to authenticate unary RPC.
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func (interceptor *AuthInterceptor) Unary() grpc.UnaryClientInterceptor {
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return func(
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ctx context.Context,
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method string,
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req, reply any,
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cc *grpc.ClientConn,
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invoker grpc.UnaryInvoker,
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opts ...grpc.CallOption,
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) error {
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return invoker(interceptor.attachToken(ctx), method, req, reply, cc, opts...)
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}
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}
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// Stream returns a client interceptor to authenticate stream RPC.
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func (interceptor *AuthInterceptor) Stream() grpc.StreamClientInterceptor {
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return func(
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ctx context.Context,
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desc *grpc.StreamDesc,
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cc *grpc.ClientConn,
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method string,
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streamer grpc.Streamer,
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opts ...grpc.CallOption,
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) (grpc.ClientStream, error) {
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return streamer(interceptor.attachToken(ctx), desc, cc, method, opts...)
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}
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}
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func (interceptor *AuthInterceptor) attachToken(ctx context.Context) context.Context {
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return metadata.AppendToOutgoingContext(ctx, "token", interceptor.accessToken)
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}
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func (interceptor *AuthInterceptor) scheduleRefreshToken(ctx context.Context, refreshInterval time.Duration) error {
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err := interceptor.refreshToken(ctx)
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if err != nil {
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return err
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}
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go func() {
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wait := refreshInterval
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for {
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select {
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case <-ctx.Done():
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return
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case <-time.After(wait):
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err := interceptor.refreshToken(ctx)
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if err != nil {
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wait = time.Second
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} else {
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wait = refreshInterval
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}
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}
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}
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}()
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return nil
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}
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func (interceptor *AuthInterceptor) refreshToken(ctx context.Context) error {
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accessToken, _, err := interceptor.authClient.Auth(ctx)
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if err != nil {
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return err
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}
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interceptor.accessToken = accessToken
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log.Trace().Msg("token refreshed")
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return nil
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}
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