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Camunda 7 Keycloak Identity Provider Plugin including all transitive dependencies
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* outputChannel;
private final DataStreamChannel internalDataChannel;
private final ResponseChannel responseChannel;
private final HttpProcessor httpProcessor;
private final HandlerFactory exchangeHandlerFactory;
private final ConnectionReuseStrategy connectionReuseStrategy;
private final HttpCoreContext context;
private final AtomicBoolean responseCommitted;
private final AtomicBoolean done;
private volatile boolean keepAlive;
private volatile AsyncServerExchangeHandler exchangeHandler;
private volatile HttpRequest receivedRequest;
private volatile MessageState requestState;
private volatile MessageState responseState;
ServerHttp1StreamHandler(
final Http1StreamChannel outputChannel,
final HttpProcessor httpProcessor,
final ConnectionReuseStrategy connectionReuseStrategy,
final HandlerFactory exchangeHandlerFactory,
final HttpCoreContext context) {
this.outputChannel = outputChannel;
this.internalDataChannel = new DataStreamChannel() {
@Override
public void requestOutput() {
outputChannel.requestOutput();
}
@Override
public void endStream(final List trailers) throws IOException {
outputChannel.complete(trailers);
if (!keepAlive) {
outputChannel.close();
}
responseState = MessageState.COMPLETE;
}
@Override
public int write(final ByteBuffer src) throws IOException {
return outputChannel.write(src);
}
@Override
public void endStream() throws IOException {
endStream(null);
}
};
this.responseChannel = new ResponseChannel() {
@Override
public void sendInformation(final HttpResponse response, final HttpContext httpContext) throws HttpException, IOException {
commitInformation(response);
}
@Override
public void sendResponse(
final HttpResponse response, final EntityDetails responseEntityDetails, final HttpContext httpContext) throws HttpException, IOException {
ServerSupport.validateResponse(response, responseEntityDetails);
commitResponse(response, responseEntityDetails);
}
@Override
public void pushPromise(
final HttpRequest promise, final AsyncPushProducer pushProducer, final HttpContext httpContext) throws HttpException, IOException {
commitPromise();
}
@Override
public String toString() {
return super.toString() + " " + ServerHttp1StreamHandler.this;
}
};
this.httpProcessor = httpProcessor;
this.connectionReuseStrategy = connectionReuseStrategy;
this.exchangeHandlerFactory = exchangeHandlerFactory;
this.context = context;
this.responseCommitted = new AtomicBoolean(false);
this.done = new AtomicBoolean(false);
this.keepAlive = true;
this.requestState = MessageState.HEADERS;
this.responseState = MessageState.IDLE;
}
private void commitResponse(
final HttpResponse response,
final EntityDetails responseEntityDetails) throws HttpException, IOException {
if (responseCommitted.compareAndSet(false, true)) {
final ProtocolVersion transportVersion = response.getVersion();
if (transportVersion != null && transportVersion.greaterEquals(HttpVersion.HTTP_2)) {
throw new UnsupportedHttpVersionException(transportVersion);
}
final int status = response.getCode();
if (status < HttpStatus.SC_SUCCESS) {
throw new HttpException("Invalid response: " + status);
}
context.setProtocolVersion(transportVersion != null ? transportVersion : HttpVersion.HTTP_1_1);
context.setAttribute(HttpCoreContext.HTTP_RESPONSE, response);
httpProcessor.process(response, responseEntityDetails, context);
final boolean endStream = responseEntityDetails == null ||
(receivedRequest != null && Method.HEAD.isSame(receivedRequest.getMethod()));
if (!connectionReuseStrategy.keepAlive(receivedRequest, response, context)) {
keepAlive = false;
}
outputChannel.submit(response, endStream, endStream ? FlushMode.IMMEDIATE : FlushMode.BUFFER);
if (endStream) {
if (!keepAlive) {
outputChannel.close();
}
responseState = MessageState.COMPLETE;
} else {
responseState = MessageState.BODY;
exchangeHandler.produce(internalDataChannel);
}
} else {
throw new HttpException("Response already committed");
}
}
private void commitInformation(final HttpResponse response) throws IOException, HttpException {
if (responseCommitted.get()) {
throw new HttpException("Response already committed");
}
final int status = response.getCode();
if (status < HttpStatus.SC_INFORMATIONAL || status >= HttpStatus.SC_SUCCESS) {
throw new HttpException("Invalid intermediate response: " + status);
}
outputChannel.submit(response, true, FlushMode.IMMEDIATE);
}
private void commitPromise() throws HttpException {
throw new HttpException("HTTP/1.1 does not support server push");
}
void activateChannel() throws IOException, HttpException {
outputChannel.activate();
}
boolean isResponseFinal() {
return responseState == MessageState.COMPLETE;
}
boolean keepAlive() {
return keepAlive;
}
boolean isCompleted() {
return requestState == MessageState.COMPLETE && responseState == MessageState.COMPLETE;
}
void terminateExchange(final HttpException ex) throws HttpException, IOException {
if (done.get() || requestState != MessageState.HEADERS) {
throw new ProtocolException("Unexpected message head");
}
receivedRequest = null;
requestState = MessageState.COMPLETE;
final HttpResponse response = new BasicHttpResponse(ServerSupport.toStatusCode(ex));
response.addHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE);
final AsyncResponseProducer responseProducer = new BasicResponseProducer(response, ServerSupport.toErrorMessage(ex));
exchangeHandler = new ImmediateResponseExchangeHandler(responseProducer);
exchangeHandler.handleRequest(null, null, responseChannel, context);
}
void consumeHeader(final HttpRequest request, final EntityDetails requestEntityDetails) throws HttpException, IOException {
if (done.get() || requestState != MessageState.HEADERS) {
throw new ProtocolException("Unexpected message head");
}
receivedRequest = request;
requestState = requestEntityDetails == null ? MessageState.COMPLETE : MessageState.BODY;
AsyncServerExchangeHandler handler;
try {
handler = exchangeHandlerFactory.create(request, context);
} catch (final MisdirectedRequestException ex) {
handler = new ImmediateResponseExchangeHandler(HttpStatus.SC_MISDIRECTED_REQUEST, ex.getMessage());
} catch (final HttpException ex) {
handler = new ImmediateResponseExchangeHandler(HttpStatus.SC_INTERNAL_SERVER_ERROR, ex.getMessage());
}
if (handler == null) {
handler = new ImmediateResponseExchangeHandler(HttpStatus.SC_NOT_FOUND, "Cannot handle request");
}
exchangeHandler = handler;
final ProtocolVersion transportVersion = request.getVersion();
if (transportVersion != null && transportVersion.greaterEquals(HttpVersion.HTTP_2)) {
throw new UnsupportedHttpVersionException(transportVersion);
}
context.setProtocolVersion(transportVersion != null ? transportVersion : HttpVersion.HTTP_1_1);
context.setAttribute(HttpCoreContext.HTTP_REQUEST, request);
try {
httpProcessor.process(request, requestEntityDetails, context);
exchangeHandler.handleRequest(request, requestEntityDetails, responseChannel, context);
} catch (final HttpException ex) {
if (!responseCommitted.get()) {
final HttpResponse response = new BasicHttpResponse(ServerSupport.toStatusCode(ex));
response.addHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE);
final AsyncResponseProducer responseProducer = new BasicResponseProducer(response, ServerSupport.toErrorMessage(ex));
exchangeHandler = new ImmediateResponseExchangeHandler(responseProducer);
exchangeHandler.handleRequest(request, requestEntityDetails, responseChannel, context);
} else {
throw ex;
}
}
}
boolean isOutputReady() {
switch (responseState) {
case BODY:
return exchangeHandler.available() > 0;
default:
return false;
}
}
void produceOutput() throws HttpException, IOException {
switch (responseState) {
case BODY:
exchangeHandler.produce(internalDataChannel);
break;
}
}
void consumeData(final ByteBuffer src) throws HttpException, IOException {
if (done.get() || requestState != MessageState.BODY) {
throw new ProtocolException("Unexpected message data");
}
if (responseState == MessageState.ACK) {
outputChannel.requestOutput();
}
exchangeHandler.consume(src);
}
void updateCapacity(final CapacityChannel capacityChannel) throws IOException {
exchangeHandler.updateCapacity(capacityChannel);
}
void dataEnd(final List trailers) throws HttpException, IOException {
if (done.get() || requestState != MessageState.BODY) {
throw new ProtocolException("Unexpected message data");
}
requestState = MessageState.COMPLETE;
exchangeHandler.streamEnd(trailers);
}
void failed(final Exception cause) {
if (!done.get()) {
exchangeHandler.failed(cause);
}
}
@Override
public void releaseResources() {
if (done.compareAndSet(false, true)) {
requestState = MessageState.COMPLETE;
responseState = MessageState.COMPLETE;
exchangeHandler.releaseResources();
}
}
void appendState(final StringBuilder buf) {
buf.append("requestState=").append(requestState)
.append(", responseState=").append(responseState)
.append(", responseCommitted=").append(responseCommitted)
.append(", keepAlive=").append(keepAlive)
.append(", done=").append(done);
}
@Override
public String toString() {
final StringBuilder buf = new StringBuilder();
buf.append("[");
appendState(buf);
buf.append("]");
return buf.toString();
}
}