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/*
* Copyright 2015-2021 Micro Focus or one of its affiliates.
*
* 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.
*/
package com.hpe.caf.autoscale.endpoint;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Objects;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Support class, which allows people to easily construct and issue REST based requests to an endpoing.
*
*/
public class HttpClientSupport
{
private static final Logger LOG = LoggerFactory.getLogger(HttpClient.class);
private final HttpClientBuilder builder;
private final URL url;
public HttpClientSupport(final URL endpoint) throws HttpClientException
{
Objects.requireNonNull(endpoint);
url = endpoint;
builder = HttpClientBuilder.create();
try {
// Adhere to the standard NO_PROXY / HTTP_PROXY / HTTPS_PROXY environment info.
// and use it for communication with our http endpoint.
final URL proxyEndpoint = HttpProxySupport.getProxyAsUrl(endpoint);
if (proxyEndpoint != null && proxyEndpoint.toURI() != null) {
builder.setProxy(HttpHost.create(proxyEndpoint.toString()));
}
} catch (URISyntaxException ex) {
// invalid proxy specified just log out this information, but continue on its not fatal to the workings!
LOG.error("Invalid proxy endpoint configuration, so continuing on without it - Exception Details: ", ex);
}
builder.addInterceptorFirst(new HttpClientHeadersInterceptor());
}
/**
* Add some standard headers to every request that is made.
*/
static class HttpClientHeadersInterceptor implements HttpRequestInterceptor
{
@Override
public void process(HttpRequest request, HttpContext context) throws HttpException, IOException
{
request.addHeader("Accept", "application/json");
request.addHeader("Content-Type", "application/json");
}
}
public T issueRequest(final RequestTemplate requestInformation, Class responseType, final String requestAction) throws HttpClientException
{
try (CloseableHttpClient client = builder.build()) {
// do a first pass, and update the requestInformation information place holders, IF any with params
final URIBuilder uriBuilder = buildURI(requestInformation, url.toString());
HttpUriRequest uriRequest = getUriRequest(requestAction, uriBuilder);
if (!requestInformation.getHeaders().isEmpty()) {
for (NameValuePair header : requestInformation.getHeaders()) {
uriRequest.addHeader(header.getName(), header.getValue());
}
}
// in addition, some request types support entities as well, check now.
if (requestInformation.getEntity() != null) {
HttpEntityEnclosingRequestBase entityRequestType = ((HttpEntityEnclosingRequestBase) uriRequest);
if (entityRequestType == null) {
throw new HttpClientException(
"Unsupport request action type is being used which doesn't support HttpEntityRequests action: " + requestAction);
}
((HttpEntityEnclosingRequestBase) uriRequest).setEntity(requestInformation.getEntity());
}
try (CloseableHttpResponse response = client.execute(uriRequest)) {
checkForError(response);
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to bother about connection release
if (entity == null) {
throw new HttpClientException("Failed to receive a valid http entity in the response.");
}
String content = EntityUtils.toString(entity);
// Stream looks too large for memory so leaving in steam, and forget leaving the content about for debugging
if (entity.getContentLength() > 20000) {
LOG.info("Streaming directly as dealing with a large response of size: " + entity.getContentLength());
try (InputStream is = entity.getContent()) {
try {
return JsonSerialization.readValue(is, responseType);
} catch (IOException e) {
// catch the exception, log out info for debug reasons, and continue, only for repeatable stream, otherwise
// we can't requestInformation it at this point, its gone.
LOG.debug("IOException during http request, response stream which is too large to debug.");
throw e;
}
}
}
try {
return JsonSerialization.readValue(content, responseType);
} catch (IOException e) {
// catch the exception, log out info for debug reasons, and continue, only for repeatable stream, otherwise
// we can't requestInformation it at this point, its gone.
LOG.debug("IOException during http request, response contains text: {%s}", content);
throw e;
}
} catch (IOException e) {
throw new RuntimeException(e);
}
} catch (IOException e) {
throw new RuntimeException(e);
} catch (URISyntaxException ex) {
throw new RuntimeException(ex);
}
}
private void checkForError(final CloseableHttpResponse response) throws IOException, ParseException, HttpClientException
{
if (response.getStatusLine().getStatusCode() != 200) {
// Check if we have a valid http error message in the response
HttpEntity entity = response.getEntity();
if (entity != null) {
String content = EntityUtils.toString(entity);
LOG.error("HttpRequest failed with code: {} reason: {}",
response.getStatusLine().getStatusCode(), response.getStatusLine().getReasonPhrase());
LOG.error("Http error response: {}", content);
}
throw new HttpClientException(
String.format("Request failed with code: {%s} reason: {%s}",
response.getStatusLine().getStatusCode(), response.getStatusLine().getReasonPhrase()));
}
}
/**
* Get the appropriate HttpRequest type object depending upon the request action type e.g. GET / POST etc
*
* @param requestAction
* @param uriBuilder
* @return
* @throws HttpClientException
* @throws URISyntaxException
*/
private HttpUriRequest getUriRequest(final String requestAction, final URIBuilder uriBuilder) throws HttpClientException, URISyntaxException
{
switch (requestAction) {
case "POST":
return new HttpPost(uriBuilder.build());
case "GET":
return new HttpGet(uriBuilder.build());
default:
throw new HttpClientException("Invalid request action type: " + requestAction);
}
}
/**
* Create a uriBuilder to be used by HttpRequest which contain correctly encoded parameters either in the path, or as query
* parameters, with correct encoding.
*
* @param request
* @return
* @throws URISyntaxException
*/
public static URIBuilder buildURI(final RequestTemplate request, final String url) throws URISyntaxException
{
String requestInfo = request.getRequestUrl();
Collection paramsAlreadyProcessed = new ArrayList<>();
URIBuilder uriBuilder = null;
if (request.getParameters().isEmpty()) {
// if we have no params, then just return a simple builder now.
return new URIBuilder(url + requestInfo);
}
// Run a first pass for path type params.
for (NameValuePair param : request.getParameters()) {
// Some parameters are to be part of the URL instead of passed as part of query string.
// check which this is now.
if (!requestInfo.contains(String.format("{%s}", param.getName()))) {
continue;
}
// the url contains this parameter, as such replace it now instead of adding as a
// query param
requestInfo = requestInfo.replace(String.format("{%s}", param.getName()), param.getValue());
// now the param has been processed remove it from the list of params.
paramsAlreadyProcessed.add(param);
}
// Now create a URIBuilder, and add the rest of the parameters as query params.
uriBuilder = new URIBuilder(url + requestInfo);
Collection remainingParams = request.getParameters();
// skip all params already processed.
remainingParams.removeAll(paramsAlreadyProcessed);
// use paramsToProcess as any path type params have already been removed.
for (NameValuePair param : remainingParams) {
uriBuilder.setParameter(param.getName(), param.getValue());
}
return uriBuilder;
}
}
