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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| module mtlstokensource | ||
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| go 1.22.4 | ||
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| require golang.org/x/oauth2 v0.22.0 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,4 @@ | ||
| github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38= | ||
| github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= | ||
| golang.org/x/oauth2 v0.22.0 h1:BzDx2FehcG7jJwgWLELCdmLuxk2i+x9UDpSiss2u0ZA= | ||
| golang.org/x/oauth2 v0.22.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI= |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,115 @@ | ||
| package mtlstokensource | ||
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| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "encoding/json" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
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| "golang.org/x/oauth2" | ||
| ) | ||
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| type MtlsTokenConfig struct { | ||
| RootCA x509.CertPool | ||
| TLSCertificate tls.Certificate | ||
| } | ||
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| type gceMetadataTransport struct { | ||
| rtp http.RoundTripper | ||
| tlsConfig *tls.Config | ||
| } | ||
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| func GCEMetadataTLSTransport(tlsconfig *tls.Config) *gceMetadataTransport { | ||
| tr := &gceMetadataTransport{ | ||
| tlsConfig: tlsconfig, | ||
| } | ||
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| myDialer := &net.Dialer{ | ||
| Timeout: 500 * time.Millisecond, | ||
| } | ||
| dc := func(ctx context.Context, network, address string) (net.Conn, error) { | ||
| overrideAddress := os.Getenv("GCE_METADATA_HOST") | ||
| if overrideAddress == "" { | ||
| overrideAddress = "metadata.google.internal:443" | ||
| } | ||
| return myDialer.DialContext(ctx, network, overrideAddress) | ||
| } | ||
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| tr.tlsConfig.ServerName = "metadata.google.internal" | ||
| tr.rtp = &http.Transport{ | ||
| Proxy: http.ProxyFromEnvironment, | ||
| DialContext: dc, | ||
| TLSHandshakeTimeout: 400 * time.Millisecond, | ||
| TLSClientConfig: tr.tlsConfig, | ||
| } | ||
| return tr | ||
| } | ||
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| func (tr *gceMetadataTransport) RoundTrip(r *http.Request) (*http.Response, error) { | ||
| r.URL.Scheme = "https" | ||
| r.Header.Add("Metadata-Flavor", "Google") | ||
| return tr.rtp.RoundTrip(r) | ||
| } | ||
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| const () | ||
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| func MtlsTokenSource(tokenConfig *MtlsTokenConfig) (oauth2.TokenSource, error) { | ||
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| tlsConfig := &tls.Config{ | ||
| RootCAs: &tokenConfig.RootCA, | ||
| Certificates: []tls.Certificate{tokenConfig.TLSCertificate}, | ||
| } | ||
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| return &mtlsTokenSource{ | ||
| refreshMutex: &sync.Mutex{}, | ||
| mtlsToken: oauth2.Token{}, | ||
| tlsConfig: tlsConfig, | ||
| }, nil | ||
| } | ||
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| type mtlsTokenSource struct { | ||
| refreshMutex *sync.Mutex | ||
| mtlsToken oauth2.Token | ||
| tlsConfig *tls.Config | ||
| } | ||
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| func (ts *mtlsTokenSource) Token() (*oauth2.Token, error) { | ||
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| ts.refreshMutex.Lock() | ||
| defer ts.refreshMutex.Unlock() | ||
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| if ts.mtlsToken.Valid() { | ||
| return &ts.mtlsToken, nil | ||
| } | ||
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| client := &http.Client{ | ||
| Transport: GCEMetadataTLSTransport(ts.tlsConfig), | ||
| Timeout: time.Duration(100) * time.Millisecond, | ||
| } | ||
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| accessTokenResp, err := client.Get("https://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| accessTokenBytes, err := io.ReadAll(accessTokenResp.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer accessTokenResp.Body.Close() | ||
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| tok := &oauth2.Token{} | ||
| err = json.Unmarshal(accessTokenBytes, tok) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return tok, nil | ||
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| } |