更新时间:2024-01-26 GMT+08:00
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Java SDK使用说明

操作场景

使用Java语言进行后端服务签名时,您需要先获取SDK,然后导入工程,最后参考校验后端签名示例校验签名是否一致。

Java SDK仅支持hmac和basic类型的后端服务签名。

前提条件

获取SDK

旧版界面:登录ROMA Connect实例控制台,在“服务集成 APIC > API管理”的“签名密钥”页签中下载SDK。

新版界面:登录ROMA Connect实例控制台,在“服务集成 APIC > 凭据管理”的“SDKs”页签中下载SDK。

导入工程

  1. 打开IntelliJ IDEA,在菜单栏选择“File > New > Project from Existing Sources”,选择解压后的“apigateway-backend-signature-demo\pom.xml”文件,单击“OK”。
    图1 Select File or Directory to Import
  2. 保持默认设置,单击“Next > Next > Next > Next > Finish”,完成工程导入。
  3. 在右侧Maven页签,双击“compile”进行编译。
    图2 编译工程

    返回“BUILD SUCCESS”,表示编译成功。

  4. 右键单击BackendSignatureApplication,选择“Run”运行服务。
    图3 运行服务

    “ApigatewaySignatureFilter.java”为示例代码,请根据实际情况修改参数后使用。具体代码说明请参考校验hmac类型后端签名示例

校验hmac类型后端签名示例

  • 示例演示如何编写一个基于Spring boot的服务器,作为API的后端,并且实现一个Filter,对APIC的请求做签名校验。
  • API绑定hmac类型签名密钥后,发给后端的请求中会添加签名信息。
  1. 编写一个Controller,路径为/hmac。
    // HelloController.java
    
    @RestController
    @EnableAutoConfiguration
    public class HelloController {
    
        @RequestMapping("/hmac")
        private String hmac() {
            return "Hmac authorization success";
        }
    }
  2. 编写一个Filter,匹配所有路径和方法。将允许的签名key和secret对放入一个Map中。
    public class ApigatewaySignatureFilter implements Filter {
        private static Map<String, String> secrets = new HashMap<>();
        static {
            // Directly writing AK/SK in code is risky. For security, encrypt your AK/SK and store them in the configuration file or environment variables. 
            // In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, set environment variables HUAWEICLOUD_SDK_AK1, HUAWEICLOUD_SDK_SK1, and HUAWEICLOUD_SDK_AK2, HUAWEICLOUD_SDK_SK2.
            secrets.put(System.getenv("HUAWEICLOUD_SDK_AK1"), System.getenv("HUAWEICLOUD_SDK_SK1"));
            secrets.put(System.getenv("HUAWEICLOUD_SDK_AK2"), System.getenv("HUAWEICLOUD_SDK_SK2"));
        }
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) {
            //签名校验代码
            ...
        }
    }
  3. doFilter函数为签名校验代码。校验流程如下:由于filter中需要读取body,为了使得body可以在后续的filter和controller中再次读取,把request包装起来传给后续的filter和controller。包装类的具体实现可见RequestWrapper.java。
    RequestWrapper request = new RequestWrapper((HttpServletRequest) servletRequest);
  4. 使用正则表达式解析Authorization头,得到signingKey和signedHeaders。
    private static final Pattern authorizationPattern = Pattern.compile("SDK-HMAC-SHA256\\s+Access=([^,]+),\\s?SignedHeaders=([^,]+),\\s?Signature=(\\w+)");
    
    ...
    
    String authorization = request.getHeader("Authorization");
    if (authorization == null || authorization.length() == 0) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization not found.");
    	return;
    }
    
    Matcher m = authorizationPattern.matcher(authorization);
    if (!m.find()) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization format incorrect.");
    	return;
    }
    String signingKey = m.group(1);
    String signingSecret = secrets.get(signingKey);
    if (signingSecret == null) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Signing key not found.");
    	return;
    }
    String[] signedHeaders = m.group(2).split(";");

    例如,Authorization头为:

    SDK-HMAC-SHA256 Access=signature_key1, SignedHeaders=host;x-sdk-date, Signature=e11adf65a20d1b82c25419b5********8d0ba12fed1ceb13ed00

    则解析的结果为:

    signingKey=signature_key1
    signedHeaders=host;x-sdk-date
  5. 通过signingKey找到signingSecret,如果不存在signingKey,则返回认证失败。
    String signingSecret = secrets.get(signingKey);
    if (signingSecret == null) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Signing key not found.");
    	return;
    }
  6. 新建一个Request对象,将请求method、url、query、signedHeaders对应的请求头放入其中。判断是否需要设置body并设置。
    需要读取body的条件为:不存在值为UNSIGNED-PAYLOAD的x-sdk-content-sha256头。
    Request apiRequest = new DefaultRequest();
    apiRequest.setHttpMethod(HttpMethodName.valueOf(request.getMethod()));
    String url = request.getRequestURL().toString();
    String queryString = request.getQueryString();
    try {
    	apiRequest.setEndpoint((new URL(url)).toURI());
    	Map<String, String> parametersmap = new HashMap<>();
    	if (null != queryString && !"".equals(queryString)) {
    		String[] parameterarray = queryString.split("&");
    		for (String p : parameterarray) {
    			String[] p_split = p.split("=", 2);
    			String key = p_split[0];
    			String value = "";
    			if (p_split.length >= 2) {
    				value = p_split[1];
    			}
    			parametersmap.put(URLDecoder.decode(key, "UTF-8"), URLDecoder.decode(value, "UTF-8"));
    		}
    		apiRequest.setParameters(parametersmap); //set query
    	}
    } catch (URISyntaxException e) {
    	e.printStackTrace();
    }
    
    boolean needbody = true;
    String dateHeader = null;
    for (int i = 0; i < signedHeaders.length; i++) {
    	String headerValue = request.getHeader(signedHeaders[i]);
    	if (headerValue == null || headerValue.length() == 0) {
    		((HttpServletResponse) response).sendError(HttpServletResponse.SC_UNAUTHORIZED, "signed header" + signedHeaders[i] + " not found.");
    	} else {
    		apiRequest.addHeader(signedHeaders[i], headerValue);//set header
    		if (signedHeaders[i].toLowerCase().equals("x-sdk-content-sha256") && headerValue.equals("UNSIGNED-PAYLOAD")) {
    			needbody = false;
    		}
    		if (signedHeaders[i].toLowerCase().equals("x-sdk-date")) {
    			dateHeader = headerValue;
    		}
    	}
    }
    
    if (needbody) {
            apiRequest.setContent(new ByteArrayInputStream(request.getBody()));    //set body
    }
  7. 校验签名是否过期。从X-Sdk-Date头中取出时间,判断与服务器时间是否相差在15分钟以内。如果signedHeaders中不包含X-Sdk-Date,也返回认证失败。
    private static final DateTimeFormatter timeFormatter = DateTimeFormat.forPattern("yyyyMMdd'T'HHmmss'Z'").withZoneUTC();
    
    ...
    
    if (dateHeader == null) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Header x-sdk-date not found.");
    	return;
    }
    long date = timeFormatter.parseMillis(dateHeader);
    long duration = Math.abs(DateTime.now().getMillis() - date);
    if (duration > 15 * 60 * 1000) {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Signature expired.");
    	return;
    }
  8. 将Authorization头也放入Request对象中,调用verify方法校验请求签名。如果校验通过,则执行下一个filter,否则返回认证失败。
    DefaultSigner signer = (DefaultSigner) SignerFactory.getSigner();
    boolean verify = signer.verify(apiRequest, new BasicCredentials(signingKey, signingSecret));
    if (verify) {
    	chain.doFilter(request, response);
    } else {
    	response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "verify authroization failed.");
    }
  9. 注册filter和路径的映射关系。
    @Configuration
    public class FilterConfig { 
        @Bean
        public FilterRegistrationBean registApigatewaySignatureFilter() {
            FilterRegistrationBean registration = new FilterRegistrationBean();
            registration.setFilter(new ApigatewaySignatureFilter());
            registration.addUrlPatterns("/hmac");
            registration.setName("ApigatewaySignatureFilter");
            return registration;
        }
    }
  10. 运行服务器,验证代码正确性。下面示例使用JavaScript SDK中的html签名工具生成签名。

    填入如图所示字段后,单击“Send request”,复制生成的curl命令,并在命令行中执行,服务器返回“Hello World!”。

    如果使用错误的Key和Secret访问,服务器返回401认证不通过。

校验basic类型后端签名示例

  • 示例演示如何编写一个基于Spring boot的服务器,作为API的后端,并且实现一个Filter,对APIC的请求做签名校验。
  • API绑定basic类型签名密钥后,发给后端的请求中会添加basic认证信息,其中basic认证的用户名为签名密钥的key,密码为签名密钥的secret。
  1. 编写一个Controller,路径为/basic。
    // HelloController.java
    
    @RestController
    @EnableAutoConfiguration
    public class HelloController {
    
        @RequestMapping("/basic")
        private String basic() {
            return "Basic authorization success";
        }
    }
  2. 编写一个Filter,按照basic认证的规则,Authorization头格式为"Basic "+base64encode(username+":"+password)。以下为根据规则编写的校验代码。
    // BasicAuthFilter.java
    public class BasicAuthFilter implements Filter {
        private static final String CREDENTIALS_PREFIX = "Basic ";
        private static Map<String, String> secrets = new HashMap<>();
    
        static {
            secrets.put("signature_key1", "signature_secret1");
            secrets.put("signature_key2", "signature_secret2");
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) {
            HttpServletRequest request = (HttpServletRequest) servletRequest;
            HttpServletResponse response = (HttpServletResponse) servletResponse;
            try {
                String credentials = request.getHeader("Authorization");
                if (credentials == null || credentials.length() == 0) {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization not found.");
                    return;
                }
    
                if (!credentials.startsWith(CREDENTIALS_PREFIX)) {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization format incorrect.");
                    return;
                }
                String authInfo = credentials.substring(CREDENTIALS_PREFIX.length());
                String decoded;
                try {
                    decoded = new String(Base64.getDecoder().decode(authInfo));
                } catch (IllegalArgumentException e) {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization format incorrect.");
                    return;
                }
                String[] spl = decoded.split(":", 2);
                if (spl.length < 2) {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authorization format incorrect.");
                    return;
                }
                String signingSecret = secrets.get(spl[0]);
                if (signingSecret == null) {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Username not found.");
                    return;
                }
                if (signingSecret.equals(spl[1])) {
                    chain.doFilter(request, response);
                } else {
                    response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Incorrect username or password");
                }
            } catch (Exception e) {
                e.printStackTrace();
                try {
                    response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
                } catch (IOException e1) {
                }
            }
        }
    }
  3. 注册filter和路径的映射关系。
    @Configuration
    public class FilterConfig { 
        @Bean
        public FilterRegistrationBean registBasicAuthFilter() {
            FilterRegistrationBean registration = new FilterRegistrationBean();
            registration.setFilter(new BasicAuthFilter());
            registration.addUrlPatterns("/basic");
            registration.setName("BasicAuthFilter");
            return registration;
        }  
    }
  4. 运行服务器,验证代码正确性。将用户名和密码生成basic认证的Authorization头域传给请求接口。如果使用错误的用户名和密码访问,服务器返回401认证不通过。

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