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/*
*
* Copyright 2023 gRPC authors.
*
* 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.
*
*/
// Binary client is an example client.
package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"time"
"golang.org/x/oauth2"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/oauth"
"google.golang.org/grpc/examples/data"
"google.golang.org/grpc/examples/features/authz/token"
ecpb "google.golang.org/grpc/examples/features/proto/echo"
"google.golang.org/grpc/status"
)
var addr = flag.String("addr", "localhost:50051", "the address to connect to")
func callUnaryEcho(ctx context.Context, client ecpb.EchoClient, message string, opts ...grpc.CallOption) error {
resp, err := client.UnaryEcho(ctx, &ecpb.EchoRequest{Message: message}, opts...)
if err != nil {
return status.Errorf(status.Code(err), "UnaryEcho RPC failed: %v", err)
}
fmt.Println("UnaryEcho: ", resp.Message)
return nil
}
func callBidiStreamingEcho(ctx context.Context, client ecpb.EchoClient, opts ...grpc.CallOption) error {
c, err := client.BidirectionalStreamingEcho(ctx, opts...)
if err != nil {
return status.Errorf(status.Code(err), "BidirectionalStreamingEcho RPC failed: %v", err)
}
for i := 0; i < 5; i++ {
err := c.Send(&ecpb.EchoRequest{Message: fmt.Sprintf("Request %d", i+1)})
if err == io.EOF {
// Bidi streaming RPC errors happen and make Send return io.EOF,
// not the RPC error itself. Call Recv to determine the error.
break
}
if err != nil {
// Some local errors are reported this way, e.g. errors serializing
// the request message.
return status.Errorf(status.Code(err), "sending StreamingEcho message: %v", err)
}
}
c.CloseSend()
for {
resp, err := c.Recv()
if err == io.EOF {
break
}
if err != nil {
return status.Errorf(status.Code(err), "receiving StreamingEcho message: %v", err)
}
fmt.Println("BidiStreaming Echo: ", resp.Message)
}
return nil
}
func newCredentialsCallOption(t token.Token) grpc.CallOption {
tokenBase64, err := t.Encode()
if err != nil {
log.Fatalf("encoding token: %v", err)
}
oath2Token := oauth2.Token{AccessToken: tokenBase64}
return grpc.PerRPCCredentials(oauth.TokenSource{TokenSource: oauth2.StaticTokenSource(&oath2Token)})
}
func main() {
flag.Parse()
// Create tls based credential.
creds, err := credentials.NewClientTLSFromFile(data.Path("x509/ca_cert.pem"), "x.test.example.com")
if err != nil {
log.Fatalf("failed to load credentials: %v", err)
}
// Set up a connection to the server.
conn, err := grpc.NewClient(*addr, grpc.WithTransportCredentials(creds))
if err != nil {
log.Fatalf("grpc.NewClient(%q): %v", *addr, err)
}
defer conn.Close()
// Make an echo client and send RPCs.
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
client := ecpb.NewEchoClient(conn)
// Make RPCs as an authorized user and expect them to succeed.
authorisedUserTokenCallOption := newCredentialsCallOption(token.Token{Username: "super-user", Secret: "super-secret"})
if err := callUnaryEcho(ctx, client, "hello world", authorisedUserTokenCallOption); err != nil {
log.Fatalf("Unary RPC by authorized user failed: %v", err)
}
if err := callBidiStreamingEcho(ctx, client, authorisedUserTokenCallOption); err != nil {
log.Fatalf("Bidirectional RPC by authorized user failed: %v", err)
}
// Make RPCs as an unauthorized user and expect them to fail with status code PermissionDenied.
unauthorisedUserTokenCallOption := newCredentialsCallOption(token.Token{Username: "bad-actor", Secret: "super-secret"})
if err := callUnaryEcho(ctx, client, "hello world", unauthorisedUserTokenCallOption); err != nil {
switch c := status.Code(err); c {
case codes.PermissionDenied:
log.Printf("Unary RPC by unauthorized user failed as expected: %v", err)
default:
log.Fatalf("Unary RPC by unauthorized user failed unexpectedly: %v, %v", c, err)
}
}
if err := callBidiStreamingEcho(ctx, client, unauthorisedUserTokenCallOption); err != nil {
switch c := status.Code(err); c {
case codes.PermissionDenied:
log.Printf("Bidirectional RPC by unauthorized user failed as expected: %v", err)
default:
log.Fatalf("Bidirectional RPC by unauthorized user failed unexpectedly: %v", err)
}
}
}
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