| /* |
| * 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. |
| */ |
| package org.apache.wicket.protocol.http; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.time.Instant; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.function.Consumer; |
| import jakarta.servlet.http.Cookie; |
| import org.apache.wicket.Application; |
| import org.apache.wicket.WicketRuntimeException; |
| import org.apache.wicket.request.Response; |
| import org.apache.wicket.request.http.WebResponse; |
| import org.apache.wicket.response.filter.IResponseFilter; |
| import org.apache.wicket.util.lang.Args; |
| import org.apache.wicket.util.string.AppendingStringBuffer; |
| |
| /** |
| * Subclass of {@link WebResponse} that buffers the actions and performs those on another response. |
| * |
| * @see #writeTo(WebResponse) |
| * |
| * @author Matej Knopp |
| */ |
| public class BufferedWebResponse extends WebResponse implements IMetaDataBufferingWebResponse |
| { |
| private final WebResponse originalResponse; |
| |
| /** |
| * Construct. |
| * |
| * @param originalResponse |
| */ |
| public BufferedWebResponse(WebResponse originalResponse) |
| { |
| // if original response had some metadata set |
| // we should transfer it to the current response |
| if (originalResponse instanceof IMetaDataBufferingWebResponse) |
| { |
| ((IMetaDataBufferingWebResponse)originalResponse).writeMetaData(this); |
| } |
| this.originalResponse = originalResponse; |
| } |
| |
| /** |
| * transfer cookie operations (add, clear) to given web response |
| * |
| * @param response |
| * web response that should receive the current cookie operation |
| */ |
| @Override |
| public void writeMetaData(WebResponse response) |
| { |
| for (Action action : actions) |
| { |
| if (action.getType() == ActionType.HEADER) |
| action.invoke(response); |
| } |
| } |
| |
| |
| @Override |
| public String encodeURL(CharSequence url) |
| { |
| if (originalResponse != null) |
| { |
| return originalResponse.encodeURL(url); |
| } |
| else |
| { |
| return url != null ? url.toString() : null; |
| } |
| } |
| |
| @Override |
| public String encodeRedirectURL(CharSequence url) |
| { |
| if (originalResponse != null) |
| { |
| return originalResponse.encodeRedirectURL(url); |
| } |
| else |
| { |
| return url != null ? url.toString() : null; |
| } |
| } |
| |
| private enum ActionType { |
| /** |
| * Actions not related directly to the content of the response, eg setting cookies, headers. |
| */ |
| HEADER, |
| REDIRECT, |
| NORMAL, |
| /** |
| * Actions directly related to the data of the response, eg writing output, etc. |
| */ |
| DATA; |
| |
| protected final Action action(Consumer<WebResponse> action) { |
| return new Action(this, action); |
| } |
| } |
| |
| private static final class Action implements Comparable<Action> |
| { |
| private final ActionType type; |
| private final Consumer<WebResponse> action; |
| |
| private Action(ActionType type, Consumer<WebResponse> action) |
| { |
| this.type = type; |
| this.action = action; |
| } |
| |
| protected final void invoke(WebResponse response) |
| { |
| action.accept(response); |
| } |
| |
| protected final ActionType getType() |
| { |
| return type; |
| } |
| |
| @Override |
| public int compareTo(Action o) |
| { |
| return getType().ordinal() - o.getType().ordinal(); |
| } |
| } |
| |
| private final List<Action> actions = new ArrayList<Action>(); |
| private StringBuilder charSequenceBuilder; |
| private ByteArrayOutputStream dataStream; |
| |
| @Override |
| public void reset() |
| { |
| super.reset(); |
| actions.clear(); |
| charSequenceBuilder = null; |
| dataStream = null; |
| } |
| |
| @Override |
| public void addCookie(Cookie cookie) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.addCookie(cookie))); |
| } |
| |
| @Override |
| public void clearCookie(Cookie cookie) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.clearCookie(cookie))); |
| } |
| |
| @Override |
| public void setContentLength(long length) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.setContentLength(length))); |
| } |
| |
| @Override |
| public void setContentType(String mimeType) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.setContentType(mimeType))); |
| } |
| |
| @Override |
| public void setDateHeader(String name, Instant date) |
| { |
| Args.notNull(date, "date"); |
| actions.add(ActionType.HEADER.action(res -> res.setDateHeader(name, date))); |
| } |
| |
| @Override |
| public boolean isHeaderSupported() |
| { |
| return originalResponse.isHeaderSupported(); |
| } |
| |
| @Override |
| public void setHeader(String name, String value) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.setHeader(name, value))); |
| } |
| |
| @Override |
| public void addHeader(String name, String value) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.addHeader(name, value))); |
| } |
| |
| @Override |
| public void disableCaching() |
| { |
| actions.add(ActionType.HEADER.action(WebResponse::disableCaching)); |
| } |
| |
| @Override |
| public void write(CharSequence sequence) |
| { |
| if (dataStream != null) |
| { |
| throw new IllegalStateException( |
| "Can't call write(CharSequence) after write(byte[]) has been called."); |
| } |
| |
| if (charSequenceBuilder == null) |
| { |
| StringBuilder builder = new StringBuilder(4096); |
| charSequenceBuilder = builder; |
| actions.add(ActionType.DATA.action(res -> |
| { |
| AppendingStringBuffer responseBuffer = new AppendingStringBuffer(builder); |
| |
| List<IResponseFilter> responseFilters = Application.get() |
| .getRequestCycleSettings() |
| .getResponseFilters(); |
| |
| if (responseFilters != null) |
| { |
| for (IResponseFilter filter : responseFilters) |
| { |
| responseBuffer = filter.filter(responseBuffer); |
| } |
| } |
| res.write(responseBuffer); |
| })); |
| } |
| charSequenceBuilder.append(sequence); |
| } |
| |
| /** |
| * Returns the text already written to this response. |
| * |
| * @return text |
| */ |
| public CharSequence getText() |
| { |
| if (dataStream != null) |
| { |
| throw new IllegalStateException("write(byte[]) has already been called."); |
| } |
| if (charSequenceBuilder != null) |
| { |
| return charSequenceBuilder; |
| } |
| else |
| { |
| return null; |
| } |
| } |
| |
| /** |
| * Replaces the text in this response |
| * |
| * @param text |
| */ |
| public void setText(CharSequence text) |
| { |
| if (dataStream != null) |
| { |
| throw new IllegalStateException("write(byte[]) has already been called."); |
| } |
| if (charSequenceBuilder != null) |
| { |
| charSequenceBuilder.setLength(0); |
| } |
| write(text); |
| } |
| |
| @Override |
| public void write(byte[] array) |
| { |
| write(array, 0, array.length); |
| } |
| |
| @Override |
| public void write(byte[] array, int offset, int length) |
| { |
| if (charSequenceBuilder != null) |
| { |
| throw new IllegalStateException( |
| "Can't call write(byte[]) after write(CharSequence) has been called."); |
| } |
| if (dataStream == null) |
| { |
| ByteArrayOutputStream stream = new ByteArrayOutputStream(); |
| dataStream = stream; |
| actions.add(ActionType.DATA.action(res -> writeStream(res, stream))); |
| } |
| dataStream.write(array, offset, length); |
| } |
| |
| @Override |
| public void sendRedirect(String url) |
| { |
| actions.add(ActionType.REDIRECT.action(res -> res.sendRedirect(url))); |
| } |
| |
| @Override |
| public void setStatus(int sc) |
| { |
| actions.add(ActionType.HEADER.action(res -> res.setStatus(sc))); |
| } |
| |
| @Override |
| public void sendError(int sc, String msg) |
| { |
| actions.add(ActionType.NORMAL.action(res -> res.sendError(sc, msg))); |
| } |
| |
| /** |
| * Writes the content of the buffer to the specified response. Also sets the properties and and |
| * headers. |
| * |
| * @param response |
| */ |
| public void writeTo(final WebResponse response) |
| { |
| Args.notNull(response, "response"); |
| |
| Collections.sort(actions); |
| |
| for (Action action : actions) |
| { |
| action.invoke(response); |
| } |
| } |
| |
| @Override |
| public boolean isRedirect() |
| { |
| for (Action action : actions) |
| { |
| if (action.getType() == ActionType.REDIRECT) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void flush() |
| { |
| actions.add(ActionType.NORMAL.action(WebResponse::flush)); |
| } |
| |
| private static void writeStream(final Response response, ByteArrayOutputStream stream) |
| { |
| final boolean copied[] = { false }; |
| try |
| { |
| // try to avoid copying the array |
| stream.writeTo(new OutputStream() |
| { |
| @Override |
| public void write(int b) throws IOException |
| { |
| |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException |
| { |
| if (off == 0 && len == b.length) |
| { |
| response.write(b); |
| copied[0] = true; |
| } |
| } |
| }); |
| } |
| catch (IOException e1) |
| { |
| throw new WicketRuntimeException(e1); |
| } |
| if (copied[0] == false) |
| { |
| response.write(stream.toByteArray()); |
| } |
| } |
| |
| /** |
| * @see java.lang.Object#toString() |
| */ |
| @Override |
| public String toString() |
| { |
| final String toString; |
| if (charSequenceBuilder != null) |
| { |
| toString = charSequenceBuilder.toString(); |
| } |
| else |
| { |
| toString = super.toString(); |
| } |
| return toString; |
| } |
| |
| @Override |
| public Object getContainerResponse() |
| { |
| return originalResponse.getContainerResponse(); |
| } |
| } |