software.amazon.awssdk.services.lambda.endpoints.internal.AwsEndpointProviderUtils Maven / Gradle / Ivy
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
* the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.services.lambda.endpoints.internal;
import static software.amazon.awssdk.utils.FunctionalUtils.invokeSafely;
import java.net.URI;
import software.amazon.awssdk.annotations.SdkInternalApi;
import software.amazon.awssdk.awscore.AwsExecutionAttribute;
import software.amazon.awssdk.core.interceptor.ExecutionAttributes;
import software.amazon.awssdk.core.interceptor.SdkExecutionAttribute;
import software.amazon.awssdk.core.interceptor.SdkInternalExecutionAttribute;
import software.amazon.awssdk.endpoints.Endpoint;
import software.amazon.awssdk.http.SdkHttpRequest;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.utils.HostnameValidator;
import software.amazon.awssdk.utils.Logger;
import software.amazon.awssdk.utils.StringUtils;
import software.amazon.awssdk.utils.http.SdkHttpUtils;
@SdkInternalApi
public final class AwsEndpointProviderUtils {
private static final Logger LOG = Logger.loggerFor(AwsEndpointProviderUtils.class);
private AwsEndpointProviderUtils() {
}
public static Region regionBuiltIn(ExecutionAttributes executionAttributes) {
return executionAttributes.getAttribute(AwsExecutionAttribute.AWS_REGION);
}
public static Boolean dualStackEnabledBuiltIn(ExecutionAttributes executionAttributes) {
return executionAttributes.getAttribute(AwsExecutionAttribute.DUALSTACK_ENDPOINT_ENABLED);
}
public static Boolean fipsEnabledBuiltIn(ExecutionAttributes executionAttributes) {
return executionAttributes.getAttribute(AwsExecutionAttribute.FIPS_ENDPOINT_ENABLED);
}
/**
* Returns the endpoint set on the client. Note that this strips off the query part of the URI because the endpoint
* rules library, e.g. {@code ParseURL} will return an exception if the URI it parses has query parameters.
*/
public static String endpointBuiltIn(ExecutionAttributes executionAttributes) {
if (endpointIsOverridden(executionAttributes)) {
return invokeSafely(() -> {
URI endpointOverride = executionAttributes.getAttribute(SdkInternalExecutionAttribute.CLIENT_ENDPOINT_PROVIDER)
.clientEndpoint();
return new URI(endpointOverride.getScheme(), null, endpointOverride.getHost(), endpointOverride.getPort(),
endpointOverride.getPath(), null, endpointOverride.getFragment()).toString();
});
}
return null;
}
/**
* Read {@link SdkExecutionAttribute#CLIENT_ENDPOINT_PROVIDER}'s isEndpointOverridden attribute.
*/
public static boolean endpointIsOverridden(ExecutionAttributes attrs) {
return attrs.getAttribute(SdkInternalExecutionAttribute.CLIENT_ENDPOINT_PROVIDER).isEndpointOverridden();
}
/**
* True if the the {@link SdkInternalExecutionAttribute#IS_DISCOVERED_ENDPOINT} attribute is present and its value
* is {@code true}, {@code false} otherwise.
*/
public static boolean endpointIsDiscovered(ExecutionAttributes attrs) {
return attrs.getOptionalAttribute(SdkInternalExecutionAttribute.IS_DISCOVERED_ENDPOINT).orElse(false);
}
/**
* True if the the {@link SdkInternalExecutionAttribute#DISABLE_HOST_PREFIX_INJECTION} attribute is present and its
* value is {@code true}, {@code false} otherwise.
*/
public static boolean disableHostPrefixInjection(ExecutionAttributes attrs) {
return attrs.getOptionalAttribute(SdkInternalExecutionAttribute.DISABLE_HOST_PREFIX_INJECTION).orElse(false);
}
/**
* Apply the given endpoint prefix to the endpoint.
*/
public static Endpoint addHostPrefix(Endpoint endpoint, String prefix) {
if (StringUtils.isBlank(prefix)) {
return endpoint;
}
validatePrefixIsHostNameCompliant(prefix);
URI originalUrl = endpoint.url();
String newHost = prefix + endpoint.url().getHost();
URI newUrl = invokeSafely(() -> new URI(originalUrl.getScheme(), null, newHost, originalUrl.getPort(),
originalUrl.getPath(), originalUrl.getQuery(), originalUrl.getFragment()));
return endpoint.toBuilder().url(newUrl).build();
}
/**
* This sets the request URI to the resolved URI returned by the endpoint provider. There are some things to be
* careful about to make this work properly:
*
* If the client endpoint is an endpoint override, it may contain a path. In addition, the request marshaller itself
* may add components to the path if it's modeled for the operation. Unfortunately,
* {@link SdkHttpRequest#encodedPath()} returns the combined path from both the endpoint and the request. There is
* no way to know, just from the HTTP request object, where the override path ends (if it's even there) and where
* the request path starts. Additionally, the rule itself may also append other parts to the endpoint override path.
*
* To solve this issue, we pass in the endpoint set on the path, which allows us to the strip the path from the
* endpoint override from the request path, and then correctly combine the paths.
*
* For example, let's suppose the endpoint override on the client is {@code https://example.com/a}. Then we call an
* operation {@code Foo()}, that marshalls {@code /c} to the path. The resulting request path is {@code /a/c}.
* However, we also pass the endpoint to provider as a parameter, and the resolver returns
* {@code https://example.com/a/b}. This method takes care of combining the paths correctly so that the resulting
* path is {@code https://example.com/a/b/c}.
*/
public static SdkHttpRequest setUri(SdkHttpRequest request, URI clientEndpoint, URI resolvedUri) {
// [client endpoint path]
String clientEndpointPath = clientEndpoint.getRawPath();
// [client endpoint path]/[request path]
String requestPath = request.encodedPath();
// [client endpoint path]/[additional path added by resolver]
String resolvedUriPath = resolvedUri.getRawPath();
String finalPath = requestPath;
// If there is an additional path added by resolver, i.e., [additional path added by resolver] not null,
// we need to combine the path
if (!resolvedUriPath.equals(clientEndpointPath)) {
finalPath = combinePath(clientEndpointPath, requestPath, resolvedUriPath);
}
return request.toBuilder().protocol(resolvedUri.getScheme()).host(resolvedUri.getHost()).port(resolvedUri.getPort())
.encodedPath(finalPath).build();
}
/**
* Our goal is to construct [client endpoint path]/[additional path added by resolver]/[request path], so we just
* need to strip the client endpoint path from the marshalled request path to isolate just the part added by the
* marshaller. Trailing slash is removed from client endpoint path before stripping because it could cause the
* leading slash to be removed from the request path: e.g., StringUtils.replaceOnce("/", "//test", "") generates
* "/test" and the expected result is "//test"
*/
private static String combinePath(String clientEndpointPath, String requestPath, String resolvedUriPath) {
String requestPathWithClientPathRemoved = StringUtils.replaceOnce(requestPath, clientEndpointPath, "");
String finalPath = SdkHttpUtils.appendUri(resolvedUriPath, requestPathWithClientPathRemoved);
return finalPath;
}
private static void validatePrefixIsHostNameCompliant(String prefix) {
String[] components = splitHostLabelOnDots(prefix);
for (String component : components) {
HostnameValidator.validateHostnameCompliant(component, component, "request");
}
}
private static String[] splitHostLabelOnDots(String label) {
return label.split("\\.");
}
}