136 lines
3.4 KiB
Go
136 lines
3.4 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package kafka
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import (
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ctx "context"
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"net/http"
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"time"
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"github.com/IBM/sarama"
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"golang.org/x/oauth2"
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ccred "golang.org/x/oauth2/clientcredentials"
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)
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type OAuthTokenSource struct {
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CachedToken oauth2.Token
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Extensions map[string]string
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TokenEndpoint oauth2.Endpoint
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ClientID string
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ClientSecret string
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Scopes []string
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httpClient *http.Client
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trustedCas []*x509.Certificate
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skipCaVerify bool
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}
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func (m KafkaMetadata) getOAuthTokenSource() *OAuthTokenSource {
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return &OAuthTokenSource{
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TokenEndpoint: oauth2.Endpoint{TokenURL: m.OidcTokenEndpoint},
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ClientID: m.OidcClientID,
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ClientSecret: m.OidcClientSecret,
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Scopes: m.internalOidcScopes,
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Extensions: m.internalOidcExtensions,
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skipCaVerify: m.TLSSkipVerify,
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}
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}
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var tokenRequestTimeout, _ = time.ParseDuration("30s")
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func (ts *OAuthTokenSource) addCa(caPem string) error {
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pemBytes := []byte(caPem)
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block, _ := pem.Decode(pemBytes)
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if block == nil || block.Type != "CERTIFICATE" {
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return fmt.Errorf("PEM data not valid or not of a valid type (CERTIFICATE)")
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}
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caCert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return fmt.Errorf("error parsing PEM certificate: %w", err)
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}
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if ts.trustedCas == nil {
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ts.trustedCas = make([]*x509.Certificate, 0)
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}
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ts.trustedCas = append(ts.trustedCas, caCert)
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return nil
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}
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func (ts *OAuthTokenSource) configureClient() {
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if ts.httpClient != nil {
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return
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}
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tlsConfig := &tls.Config{
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MinVersion: tls.VersionTLS12,
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InsecureSkipVerify: ts.skipCaVerify, //nolint:gosec
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}
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if ts.trustedCas != nil {
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caPool, err := x509.SystemCertPool()
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if err != nil {
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caPool = x509.NewCertPool()
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}
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for _, c := range ts.trustedCas {
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caPool.AddCert(c)
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}
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tlsConfig.RootCAs = caPool
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}
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ts.httpClient = &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: tlsConfig,
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},
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}
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}
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func (ts *OAuthTokenSource) Token() (*sarama.AccessToken, error) {
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if ts.CachedToken.Valid() {
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return ts.asSaramaToken(), nil
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}
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if ts.TokenEndpoint.TokenURL == "" || ts.ClientID == "" || ts.ClientSecret == "" {
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return nil, fmt.Errorf("cannot generate token, OAuthTokenSource not fully configured")
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}
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oidcCfg := ccred.Config{ClientID: ts.ClientID, ClientSecret: ts.ClientSecret, Scopes: ts.Scopes, TokenURL: ts.TokenEndpoint.TokenURL, AuthStyle: ts.TokenEndpoint.AuthStyle}
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timeoutCtx, cancel := ctx.WithTimeout(ctx.TODO(), tokenRequestTimeout)
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defer cancel()
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ts.configureClient()
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timeoutCtx = ctx.WithValue(timeoutCtx, oauth2.HTTPClient, ts.httpClient)
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token, err := oidcCfg.Token(timeoutCtx)
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if err != nil {
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return nil, fmt.Errorf("error generating oauth2 token: %w", err)
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}
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ts.CachedToken = *token
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return ts.asSaramaToken(), nil
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}
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func (ts *OAuthTokenSource) asSaramaToken() *sarama.AccessToken {
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return &(sarama.AccessToken{Token: ts.CachedToken.AccessToken, Extensions: ts.Extensions})
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}
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