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Merge pull request #1070 from Apicurio/feat/httpRefs
UI also supports external http/s references.
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117 changes: 117 additions & 0 deletions
117
front-end/servlet/src/main/java/io/apicurio/studio/fe/servlet/servlets/FetchServlet.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * Copyright 2020 Red Hat | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package io.apicurio.studio.fe.servlet.servlets; | ||
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|
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| import javax.annotation.PostConstruct; | ||
| import javax.annotation.PreDestroy; | ||
| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServlet; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
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|
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| import org.apache.commons.io.IOUtils; | ||
| import org.apache.http.Header; | ||
| import org.apache.http.client.config.RequestConfig; | ||
| import org.apache.http.client.methods.CloseableHttpResponse; | ||
| import org.apache.http.client.methods.HttpGet; | ||
| import org.apache.http.impl.client.CloseableHttpClient; | ||
| import org.apache.http.impl.client.cache.CacheConfig; | ||
| import org.apache.http.impl.client.cache.CachingHttpClients; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| /** | ||
| * Servlet used to fetch external content to avoid CORS issues. | ||
| * @author [email protected] | ||
| */ | ||
| public class FetchServlet extends HttpServlet { | ||
|
|
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| private static final long serialVersionUID = -3103265971135926034L; | ||
| private static Logger logger = LoggerFactory.getLogger(FetchServlet.class); | ||
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| private CloseableHttpClient httpClient; | ||
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| @PostConstruct | ||
| protected void postConstruct() { | ||
| try { | ||
| // TODO make these settings configurable!! | ||
| CacheConfig cacheConfig = CacheConfig.custom() | ||
| .setMaxCacheEntries(2000) | ||
| .setMaxObjectSize(16384) | ||
| .build(); | ||
| RequestConfig requestConfig = RequestConfig.custom() | ||
| .setConnectTimeout(30000) | ||
| .setSocketTimeout(30000) | ||
| .build(); | ||
| this.httpClient = CachingHttpClients.custom() | ||
| .setCacheConfig(cacheConfig) | ||
| .setDefaultRequestConfig(requestConfig) | ||
| .build(); | ||
| } catch (Exception e) { | ||
| logger.error("Error creating HTTP client.", e); | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
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| @PreDestroy | ||
| protected void preDestroy() { | ||
| try { | ||
| httpClient.close(); | ||
| } catch (IOException e) { | ||
| logger.error("Error closing HTTP client.", e); | ||
| } | ||
| } | ||
|
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| /** | ||
| * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) | ||
| */ | ||
| @Override | ||
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { | ||
| String url = req.getParameter("url"); | ||
| proxyUrlTo(url, req, resp); | ||
| } | ||
|
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| /** | ||
| * Makes an HTTP connect to the given url and then proxies the response to | ||
| * the given HTTP response. | ||
| * @param url | ||
| * @param request | ||
| * @param response | ||
| */ | ||
| private void proxyUrlTo(String url, HttpServletRequest request, HttpServletResponse response) { | ||
| try { | ||
| HttpGet get = new HttpGet(url); | ||
| try (CloseableHttpResponse apiResponse = httpClient.execute(get)) { | ||
| response.setStatus(apiResponse.getStatusLine().getStatusCode()); | ||
| Header[] headers = apiResponse.getAllHeaders(); | ||
| for (Header header : headers) { | ||
| response.setHeader(header.getName(), header.getValue()); | ||
| } | ||
| InputStream stream = apiResponse.getEntity().getContent(); | ||
| IOUtils.copy(stream, response.getOutputStream()); | ||
| response.getOutputStream().flush(); | ||
| } | ||
| } catch (IOException e) { | ||
| logger.error("Error proxying URL: " + url, e); | ||
| try { response.sendError(500); } catch (IOException e1) {} | ||
| } | ||
| } | ||
|
|
||
| } |
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