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metadata_provider.go
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/
metadata_provider.go
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package authzserver
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
"google.golang.org/grpc/codes"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/retry"
"github.com/flyteorg/flyte/flyteadmin/auth"
authConfig "github.com/flyteorg/flyte/flyteadmin/auth/config"
flyteErrors "github.com/flyteorg/flyte/flyteadmin/pkg/errors"
"github.com/flyteorg/flyte/flyteidl/gen/pb-go/flyteidl/service"
"github.com/flyteorg/flyte/flytestdlib/logger"
)
type OAuth2MetadataProvider struct {
cfg *authConfig.Config
}
// Override auth func to enforce anonymous access on the implemented APIs
// Ref: https://github.com/grpc-ecosystem/go-grpc-middleware/blob/master/auth/auth.go#L31
func (s OAuth2MetadataProvider) AuthFuncOverride(ctx context.Context, fullMethodName string) (context.Context, error) {
return ctx, nil
}
func (s OAuth2MetadataProvider) GetOAuth2Metadata(ctx context.Context, r *service.OAuth2MetadataRequest) (*service.OAuth2MetadataResponse, error) {
switch s.cfg.AppAuth.AuthServerType {
case authConfig.AuthorizationServerTypeSelf:
u := auth.GetPublicURL(ctx, nil, s.cfg)
doc := &service.OAuth2MetadataResponse{
Issuer: GetIssuer(ctx, nil, s.cfg),
AuthorizationEndpoint: u.ResolveReference(authorizeRelativeURL).String(),
TokenEndpoint: u.ResolveReference(tokenRelativeURL).String(),
JwksUri: u.ResolveReference(jsonWebKeysURL).String(),
CodeChallengeMethodsSupported: []string{"S256"},
ResponseTypesSupported: []string{
"code",
"token",
"code token",
},
GrantTypesSupported: supportedGrantTypes,
ScopesSupported: []string{auth.ScopeAll},
TokenEndpointAuthMethodsSupported: []string{
"client_secret_basic",
},
}
return doc, nil
default:
baseURL := s.cfg.UserAuth.OpenID.BaseURL
if len(s.cfg.AppAuth.ExternalAuthServer.BaseURL.String()) > 0 {
baseURL = s.cfg.AppAuth.ExternalAuthServer.BaseURL
}
// issuer urls, conventionally, do not end with a '/', however, metadata urls are usually relative of those.
// This adds a '/' to ensure ResolveReference behaves intuitively.
baseURL.Path = strings.TrimSuffix(baseURL.Path, "/") + "/"
var externalMetadataURL *url.URL
if len(s.cfg.AppAuth.ExternalAuthServer.MetadataEndpointURL.String()) > 0 {
externalMetadataURL = baseURL.ResolveReference(&s.cfg.AppAuth.ExternalAuthServer.MetadataEndpointURL.URL)
} else {
externalMetadataURL = baseURL.ResolveReference(oauth2MetadataEndpoint)
}
httpClient := &http.Client{}
if len(s.cfg.HTTPProxyURL.String()) > 0 {
// create a transport that uses the proxy
transport := &http.Transport{
Proxy: http.ProxyURL(&s.cfg.HTTPProxyURL.URL),
}
httpClient.Transport = transport
}
response, err := sendAndRetryHTTPRequest(ctx, httpClient, externalMetadataURL.String(), s.cfg.AppAuth.ExternalAuthServer.RetryAttempts, s.cfg.AppAuth.ExternalAuthServer.RetryDelay.Duration)
if err != nil {
return nil, err
}
raw, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, err
}
resp := &service.OAuth2MetadataResponse{}
err = unmarshalResp(response, raw, resp)
if err != nil {
return nil, err
}
return resp, nil
}
}
func (s OAuth2MetadataProvider) GetPublicClientConfig(context.Context, *service.PublicClientAuthConfigRequest) (*service.PublicClientAuthConfigResponse, error) {
return &service.PublicClientAuthConfigResponse{
ClientId: s.cfg.AppAuth.ThirdParty.FlyteClientConfig.ClientID,
RedirectUri: s.cfg.AppAuth.ThirdParty.FlyteClientConfig.RedirectURI,
Scopes: s.cfg.AppAuth.ThirdParty.FlyteClientConfig.Scopes,
AuthorizationMetadataKey: s.cfg.GrpcAuthorizationHeader,
Audience: s.cfg.AppAuth.ThirdParty.FlyteClientConfig.Audience,
}, nil
}
func NewService(config *authConfig.Config) OAuth2MetadataProvider {
return OAuth2MetadataProvider{
cfg: config,
}
}
func sendAndRetryHTTPRequest(ctx context.Context, client *http.Client, url string, retryAttempts int, retryDelay time.Duration) (*http.Response, error) {
var response *http.Response
var err error
totalAttempts := retryAttempts + 1 // Add one for initial http request attempt
backoff := wait.Backoff{
Duration: retryDelay,
Steps: totalAttempts,
}
retryableOauthMetadataError := flyteErrors.NewFlyteAdminError(codes.Internal, "Failed to get oauth metadata.")
err = retry.OnError(backoff,
func(err error) bool { // Determine if error is retryable
return err == retryableOauthMetadataError
}, func() error { // Send HTTP request
response, err = client.Get(url)
if err != nil {
logger.Errorf(ctx, "Failed to send oauth metadata HTTP request. Err: %v", err)
return err
}
if response != nil && response.StatusCode >= http.StatusUnauthorized && response.StatusCode <= http.StatusNetworkAuthenticationRequired {
logger.Errorf(ctx, "Failed to get oauth metadata, going to retry. StatusCode: %v Err: %v", response.StatusCode, err)
return retryableOauthMetadataError
}
return nil
})
if err != nil {
return nil, err
}
if response != nil && response.StatusCode != http.StatusOK {
return response, fmt.Errorf("failed to get oauth metadata with status code %v", response.StatusCode)
}
return response, nil
}