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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| // Copyright 2024 Tetrate | ||
| // | ||
| // 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 oidc | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/lestrrat-go/jwx/jwk" | ||
| "github.com/tetratelabs/telemetry" | ||
|
|
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| "github.com/tetrateio/authservice-go/internal" | ||
| ) | ||
|
|
||
| // JWKSProvider is an interface for providing JWKS documents. | ||
| type JWKSProvider interface { | ||
| // Get the configured JWKS document. | ||
| Get(context.Context) (jwk.Set, error) | ||
| } | ||
|
|
||
| var ( | ||
| _ JWKSProvider = (*staticJWKSProvider)(nil) | ||
| _ JWKSProvider = (*dynamicJWKSProvider)(nil) | ||
|
|
||
| // ErrJWKSParse is returned when the JWKS document cannot be parsed. | ||
| ErrJWKSParse = errors.New("error parsing JWKS document") | ||
| // ErrJWKSFetch is returned when the JWKS document cannot be fetched. | ||
| ErrJWKSFetch = errors.New("error fetching JWKS document") | ||
| ) | ||
|
|
||
| // staticJWKSProvider is a JWKSProvider that returns a static JWKS document. | ||
| type staticJWKSProvider struct { | ||
| log telemetry.Logger | ||
| jwks jwk.Set | ||
| } | ||
|
|
||
| // NewStaticJWKSProvider returns a new JWKSProvider that returns the given raw JWKS document. | ||
| func NewStaticJWKSProvider(raw string) (JWKSProvider, error) { | ||
| jwks, err := jwk.Parse([]byte(raw)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("%w: %v", ErrJWKSParse, err) | ||
| } | ||
|
|
||
| return &staticJWKSProvider{ | ||
| log: internal.Logger(internal.JWKS), | ||
| jwks: jwks, | ||
| }, nil | ||
| } | ||
|
|
||
| func (s *staticJWKSProvider) Get(_ context.Context) (jwk.Set, error) { | ||
| return s.jwks, nil | ||
| } | ||
|
|
||
| // dynamicJWKSProvider is a JWKSProvider that returns a JWKS document from a URL and | ||
| // updates it asynchronously on a regular interval. | ||
| type dynamicJWKSProvider struct { | ||
| log telemetry.Logger | ||
| jwksURL string | ||
| refreshInterval time.Duration | ||
| // cache of JWKS documents internally cached by the JWKS URL. | ||
| cache *jwk.AutoRefresh | ||
| } | ||
|
|
||
| // NewDynamicJWKSProvider returns a new JWKSProvider that returns the JWKS document from the given URL. | ||
| func NewDynamicJWKSProvider(ctx context.Context, jwksURL string, refreshInterval time.Duration) JWKSProvider { | ||
| log := internal.Logger(internal.JWKS) | ||
|
|
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| ch := make(chan jwk.AutoRefreshError) | ||
| autoRefresh := jwk.NewAutoRefresh(ctx) | ||
| autoRefresh.ErrorSink(ch) | ||
| autoRefresh.Configure(jwksURL, jwk.WithRefreshInterval(refreshInterval)) | ||
|
|
||
| go func(ctx context.Context) { | ||
| for { | ||
| select { | ||
| case err := <-ch: | ||
| log.Debug("jwks auto refresh error", "error", err) | ||
| case <-ctx.Done(): | ||
| return | ||
| } | ||
| } | ||
| }(ctx) | ||
|
|
||
| return &dynamicJWKSProvider{ | ||
| log: log, | ||
| jwksURL: jwksURL, | ||
| refreshInterval: refreshInterval, | ||
| cache: autoRefresh, | ||
| } | ||
| } | ||
|
|
||
| // Get the JWKS document from the configured URL. | ||
| // The JWKS document is cached and auto-updated at the configured interval. | ||
| func (d *dynamicJWKSProvider) Get(ctx context.Context) (jwk.Set, error) { | ||
| jwks, err := d.cache.Fetch(ctx, d.jwksURL) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("%w: %v", ErrJWKSFetch, err) | ||
| } | ||
| return jwks, nil | ||
| } |
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