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1 | /* |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | package org.apache.arrow.flight.auth; | |
19 | ||
20 | import java.util.Iterator; | |
21 | import java.util.concurrent.CompletableFuture; | |
22 | import java.util.concurrent.ExecutionException; | |
23 | import java.util.concurrent.LinkedBlockingQueue; | |
24 | ||
25 | import org.apache.arrow.flight.auth.ClientAuthHandler.ClientAuthSender; | |
26 | import org.apache.arrow.flight.grpc.StatusUtils; | |
27 | import org.apache.arrow.flight.impl.Flight.HandshakeRequest; | |
28 | import org.apache.arrow.flight.impl.Flight.HandshakeResponse; | |
29 | import org.apache.arrow.flight.impl.FlightServiceGrpc.FlightServiceStub; | |
30 | ||
31 | import com.google.protobuf.ByteString; | |
32 | ||
33 | import io.grpc.StatusRuntimeException; | |
34 | import io.grpc.stub.StreamObserver; | |
35 | ||
36 | /** | |
37 | * Utility class for performing authorization over using a GRPC stub. | |
38 | */ | |
39 | public class ClientAuthWrapper { | |
40 | ||
41 | /** | |
42 | * Do client auth for a client. The stub will be authenticated after this method returns. | |
43 | * | |
44 | * @param authHandler The handler to use. | |
45 | * @param stub The service stub. | |
46 | */ | |
47 | public static void doClientAuth(ClientAuthHandler authHandler, FlightServiceStub stub) { | |
48 | AuthObserver observer = new AuthObserver(); | |
49 | try { | |
50 | observer.responseObserver = stub.handshake(observer); | |
51 | authHandler.authenticate(observer.sender, observer.iter); | |
52 | if (!observer.sender.errored) { | |
53 | observer.responseObserver.onCompleted(); | |
54 | } | |
55 | } catch (StatusRuntimeException sre) { | |
56 | throw StatusUtils.fromGrpcRuntimeException(sre); | |
57 | } | |
58 | try { | |
59 | if (!observer.completed.get()) { | |
60 | // TODO: ARROW-5681 | |
61 | throw new RuntimeException("Unauthenticated"); | |
62 | } | |
63 | } catch (InterruptedException e) { | |
64 | throw new RuntimeException(e); | |
65 | } catch (ExecutionException e) { | |
66 | throw StatusUtils.fromThrowable(e.getCause()); | |
67 | } | |
68 | } | |
69 | ||
70 | private static class AuthObserver implements StreamObserver<HandshakeResponse> { | |
71 | ||
72 | private volatile StreamObserver<HandshakeRequest> responseObserver; | |
73 | private final LinkedBlockingQueue<byte[]> messages = new LinkedBlockingQueue<>(); | |
74 | private final AuthSender sender = new AuthSender(); | |
75 | private CompletableFuture<Boolean> completed; | |
76 | ||
77 | public AuthObserver() { | |
78 | super(); | |
79 | completed = new CompletableFuture<>(); | |
80 | } | |
81 | ||
82 | @Override | |
83 | public void onNext(HandshakeResponse value) { | |
84 | ByteString payload = value.getPayload(); | |
85 | if (payload != null) { | |
86 | messages.add(payload.toByteArray()); | |
87 | } | |
88 | } | |
89 | ||
90 | private Iterator<byte[]> iter = new Iterator<byte[]>() { | |
91 | ||
92 | @Override | |
93 | public byte[] next() { | |
94 | while (!completed.isDone() || !messages.isEmpty()) { | |
95 | byte[] bytes = messages.poll(); | |
96 | if (bytes == null) { | |
97 | // busy wait. | |
98 | continue; | |
99 | } else { | |
100 | return bytes; | |
101 | } | |
102 | } | |
103 | ||
104 | if (completed.isCompletedExceptionally()) { | |
105 | // Preserve prior exception behavior | |
106 | // TODO: with ARROW-5681, throw an appropriate Flight exception if gRPC raised an exception | |
107 | try { | |
108 | completed.get(); | |
109 | } catch (InterruptedException e) { | |
110 | throw new RuntimeException(e); | |
111 | } catch (ExecutionException e) { | |
112 | if (e.getCause() instanceof StatusRuntimeException) { | |
113 | throw (StatusRuntimeException) e.getCause(); | |
114 | } | |
115 | throw new RuntimeException(e); | |
116 | } | |
117 | } | |
118 | ||
119 | throw new IllegalStateException("You attempted to retrieve messages after there were none."); | |
120 | } | |
121 | ||
122 | @Override | |
123 | public boolean hasNext() { | |
124 | return !messages.isEmpty(); | |
125 | } | |
126 | }; | |
127 | ||
128 | @Override | |
129 | public void onError(Throwable t) { | |
130 | completed.completeExceptionally(t); | |
131 | } | |
132 | ||
133 | private class AuthSender implements ClientAuthSender { | |
134 | ||
135 | private boolean errored = false; | |
136 | ||
137 | @Override | |
138 | public void send(byte[] payload) { | |
139 | try { | |
140 | responseObserver.onNext(HandshakeRequest.newBuilder() | |
141 | .setPayload(ByteString.copyFrom(payload)) | |
142 | .build()); | |
143 | } catch (StatusRuntimeException sre) { | |
144 | throw StatusUtils.fromGrpcRuntimeException(sre); | |
145 | } | |
146 | } | |
147 | ||
148 | @Override | |
149 | public void onError(Throwable cause) { | |
150 | this.errored = true; | |
151 | responseObserver.onError(StatusUtils.toGrpcException(cause)); | |
152 | } | |
153 | ||
154 | } | |
155 | ||
156 | @Override | |
157 | public void onCompleted() { | |
158 | completed.complete(true); | |
159 | } | |
160 | } | |
161 | ||
162 | } |