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Allows Java applications written for a servlet container to run in AWS Lambda
/*
* Copyright 2020 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 com.amazonaws.serverless.proxy.model;
import com.amazonaws.serverless.proxy.internal.servlet.AwsProxyHttpServletRequest;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
/**
* Configuration parameters for the framework
*/
public class ContainerConfig {
public static final String DEFAULT_URI_ENCODING = "UTF-8";
public static final String DEFAULT_CONTENT_CHARSET = "ISO-8859-1";
private static final List DEFAULT_FILE_PATHS = new ArrayList() {{ add("/tmp"); add("/var/task"); }};
private static final int DEFAULT_MAX_INIT_TIMEOUT_MS = 20_000;
private static final String MAX_INIT_TIMEOUT_ENVIRONMENT_VARIABLE_NAME = "AWS_SERVERLESS_JAVA_CONTAINER_MAX_INIT_TIMEOUT";
private static final int MAX_INIT_TIMEOUT_MS = Integer.parseInt(System.getenv().getOrDefault(
MAX_INIT_TIMEOUT_ENVIRONMENT_VARIABLE_NAME, Integer.toString(DEFAULT_MAX_INIT_TIMEOUT_MS)));
public static ContainerConfig defaultConfig() {
ContainerConfig configuration = new ContainerConfig();
configuration.setStripBasePath(false);
configuration.setUriEncoding(DEFAULT_URI_ENCODING);
configuration.setConsolidateSetCookieHeaders(false);
configuration.setUseStageAsServletContext(false);
configuration.setValidFilePaths(DEFAULT_FILE_PATHS);
configuration.setQueryStringCaseSensitive(false);
configuration.addBinaryContentTypes("application/octet-stream", "image/jpeg", "image/png", "image/gif");
configuration.setDefaultContentCharset(DEFAULT_CONTENT_CHARSET);
configuration.setInitializationTimeout(MAX_INIT_TIMEOUT_MS);
configuration.setDisableExceptionMapper(false);
return configuration;
}
//-------------------------------------------------------------
// Variables - Private
//-------------------------------------------------------------
private String serviceBasePath;
private boolean stripBasePath;
private String uriEncoding;
private String defaultContentCharset;
private boolean consolidateSetCookieHeaders;
private boolean useStageAsServletContext;
private List validFilePaths;
private List customDomainNames;
private boolean queryStringCaseSensitive;
private final HashSet binaryContentTypes;
private int initializationTimeout;
private boolean disableExceptionMapper;
public ContainerConfig() {
validFilePaths = new ArrayList<>();
customDomainNames = new ArrayList<>();
binaryContentTypes = new HashSet<>();
}
//-------------------------------------------------------------
// Methods - Getter/Setter
//-------------------------------------------------------------
/**
* Returns the base path configured in the container. This configuration variable is used in conjuction with {@link #setStripBasePath(boolean)} to route
* the request. When requesting the context path from an HttpServletRequest: {@link AwsProxyHttpServletRequest#getContextPath()} this base path is added
* to the context even though it was initially stripped for the purpose of routing the request. We decided to add it to the context to address GitHub issue
* #84 and allow framework's link builders to it.
*
* @return The base path configured for the container
*/
public String getServiceBasePath() {
return serviceBasePath;
}
/**
* Configures a base path that can be stripped from the request path before passing it to the framework-specific implementation. This can be used to
* remove API Gateway's base path mappings from the request.
* @param serviceBasePath The base path mapping to be removed.
*/
public void setServiceBasePath(String serviceBasePath) {
if (serviceBasePath == null) {
this.serviceBasePath = null;
return;
}
// clean up base path before setting it, we want a "/" at the beginning but not at the end.
String finalBasePath = serviceBasePath;
if (!finalBasePath.startsWith("/")) {
finalBasePath = "/" + serviceBasePath;
}
if (finalBasePath.endsWith("/")) {
finalBasePath = finalBasePath.substring(0, finalBasePath.length() - 1);
}
this.serviceBasePath = finalBasePath;
}
public boolean isStripBasePath() {
return stripBasePath;
}
/**
* Whether this framework should strip the base path mapping specified with the {@link #setServiceBasePath(String)} method from a request before
* passing it to the framework-specific implementations
* @param stripBasePath
*/
public void setStripBasePath(boolean stripBasePath) {
this.stripBasePath = stripBasePath;
}
public String getUriEncoding() {
return uriEncoding;
}
/**
* Sets the charset used to URLEncode and Decode request paths.
* @param uriEncoding The charset. By default this is set to UTF-8
*/
public void setUriEncoding(String uriEncoding) {
this.uriEncoding = uriEncoding;
}
public boolean isConsolidateSetCookieHeaders() {
return consolidateSetCookieHeaders;
}
/**
* Tells the library to consolidate multiple Set-Cookie headers into a single Set-Cookie header with multiple, comma-separated values. This is allowed
* by the RFC 2109 (https://tools.ietf.org/html/rfc2109). However, since not all clients support this, we consider it optional. When this value is set
* to true the framework will consolidate all Set-Cookie headers into a single header, when it's set to false, the framework will only return the first
* Set-Cookie header specified in a response.
*
* Because API Gateway needs header keys to be unique, we give an option to configure this.
* @param consolidateSetCookieHeaders Whether to consolidate the cookie headers or not.
*/
public void setConsolidateSetCookieHeaders(boolean consolidateSetCookieHeaders) {
this.consolidateSetCookieHeaders = consolidateSetCookieHeaders;
}
/**
* Tells whether the stage name passed in the request should be added to the context path: {@link AwsProxyHttpServletRequest#getContextPath()}.
* @return true if the stage will be included in the context path, false otherwise.
*/
public boolean isUseStageAsServletContext() {
return useStageAsServletContext;
}
/**
* Sets whether the API Gateway stage name should be included in the servlet context path.
* @param useStageAsServletContext true if you want the stage to appear as the root of the context path, false otherwise.
*/
public void setUseStageAsServletContext(boolean useStageAsServletContext) {
this.useStageAsServletContext = useStageAsServletContext;
}
/**
* Returns the list of file paths that the servlet accepts read/write requests to
* @return A List of file paths. By default this is set to /tmp and /var/task
*/
public List getValidFilePaths() {
return validFilePaths;
}
/**
* Sets a list of valid file paths for the servlet to read/write from.
* @param validFilePaths A populated list of base paths
*/
public void setValidFilePaths(List validFilePaths) {
this.validFilePaths = validFilePaths;
}
/**
* Adds a new base path to the list of allowed paths.
* @param filePath The base path
*/
public void addValidFilePath(String filePath) {
validFilePaths.add(filePath);
}
/**
* Adds a new custom domain name to the list of allowed domains
* @param name The new custom domain name, excluding the scheme ("https") and port
*/
public void addCustomDomain(String name) {
customDomainNames.add(name);
}
/**
* Returns the list of custom domain names enabled for the application
* @return The configured custom domain names
*/
public List getCustomDomainNames() {
return customDomainNames;
}
/**
* Enables localhost custom domain name for testing. This setting should be used only in local
* with SAM local
*/
public void enableLocalhost() {
customDomainNames.add("localhost");
}
/**
* Whether query string parameters in the request should be case sensitive or not. By default
* this is set to false for backward compatibility.
* @return true if the parameter matching algorithm is case sensitive
*/
public boolean isQueryStringCaseSensitive() {
return queryStringCaseSensitive;
}
/**
* Sets whether query string parameter names should be treated as case sensitive. The default
* value of this option is false for backward compatibility.
* @param queryStringCaseSensitive Tells the framework to treat query string parameter names as case sensitive
*/
public void setQueryStringCaseSensitive(boolean queryStringCaseSensitive) {
this.queryStringCaseSensitive = queryStringCaseSensitive;
}
/**
* Configure specified content type(s) as binary
* @param contentTypes list of exact content types that will be considered as binary
*/
public void addBinaryContentTypes(String... contentTypes) {
if(contentTypes != null) {
binaryContentTypes.addAll(Arrays.asList(contentTypes));
}
}
/**
* Determine if specified content type has been configured as binary
* @param contentType content type to query
* @return
*/
public boolean isBinaryContentType(String contentType) {
return contentType != null && binaryContentTypes.contains(contentType.trim());
}
/**
* Returns the name of the default charset appended to the Content-Type header if no charset is specified by the request. The
* default value of this is ISO-8859-1.
* @return The name of the default charset for the Content-Type header
*/
public String getDefaultContentCharset() {
return defaultContentCharset;
}
/**
* Sets the default charset value for the Content-Type header if no charset is specified with a request. The default value of this
* is ISO-8859-1. If a request specifies a Content-Type header without a charset property, the value of
* this field is automatically appended to the header.
* @param defaultContentCharset The name of the charset for the content type header.
*/
public void setDefaultContentCharset(String defaultContentCharset) {
this.defaultContentCharset = defaultContentCharset;
}
/**
* Returns the maximum amount of time (in milliseconds) set for the initialization time. See documentation on the
* {@link #setInitializationTimeout(int)} for additional details.
* @return The max time allocated for initialization
*/
public int getInitializationTimeout() {
return initializationTimeout;
}
/**
* Sets the initialization timeout. When using an async {@link com.amazonaws.serverless.proxy.InitializationWrapper}
* the underlying framework is initialized in a separate thread. Serverless Java Container will wait for the maximum
* time available during AWS Lambda's init step (~10 seconds) and then return control to the main thread. In the meanwhile,
* the initialization process of the underlying framework can continue in a separate thread. AWS Lambda will then call
* the handler class to handle an event. This timeout is the maximum amount of time Serverless Java Container framework
* will wait for the underlying framework to initialize before returning an error. By default, this is set to 10 seconds.
* @param initializationTimeout The maximum amount of time to wait for the underlying framework initialization after
* an event is received in milliseconds.
*/
public void setInitializationTimeout(int initializationTimeout) {
this.initializationTimeout = initializationTimeout;
}
/**
* Whether the framework will run exception thrown by the application through the implementation of
* {@link com.amazonaws.serverless.proxy.ExceptionHandler}. When this parameter is set to false the Lambda
* container handler object lets the Exception propagate upwards to the Lambda handler class.
* @return true if exception mapping is disabled, false otherwise.
*/
public boolean isDisableExceptionMapper() {
return disableExceptionMapper;
}
/**
* This configuration parameter tells the container whether it should skip exception mapping and simply let any
* Exception thrown by the underlying application bubble up to the Lambda handler class.
* @param disable Set this value to true to disable exception mapping, false otherwise.
*/
public void setDisableExceptionMapper(boolean disable) {
this.disableExceptionMapper = disable;
}
}