创建JSON Web令牌

JSON Web令牌是一种开放的行业标准RFC 7519方法，用于在两方之间安全地表示声明。 在此示例中，使用JWT.io库来生成JWT。
您在上一步中下载的服务凭据包含PKCS#1格式的私钥。要从此字符串中提取私钥，我们使用了 弹城堡 库。 属于java一部分的加密库不支持PKCS#1格式。

以下代码用于生成JWT：

public String getJWTToken()
    {
            Security.addProvider(new BouncyCastleProvider());
            RSAPrivateKey privateKey = null;
            GetServiceCredentials getCredentials = new GetServiceCredentials();
            try
            {

                long now = System.currentTimeMillis();
                Long expirationTime = now + TimeUnit.MINUTES.toMillis(5);
                // get the private key string from the service credentials
                String privateKeyString = getCredentials.getPRIVATE_KEY();
              //The JWT signature algorithm we use to sign the token
                SignatureAlgorithm sa = SignatureAlgorithm.RS256;


                Reader targetReader = new StringReader(privateKeyString);
                // PEMParser removes the unnecessary headers and decodes the underlying Base64 PEM data into a binary format.
                PEMParser pemParser = new PEMParser(targetReader);
                // tores the result generated by the pEMParser
                Object object = pemParser.readObject();
                JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
                KeyPair kp = converter.getKeyPair((PEMKeyPair) object);
                privateKey = (RSAPrivateKey) kp.getPrivate();

              //Let's set the JWT Claims

                Map < String, Object > jwtClaims = new HashMap < String, Object > ();
                jwtClaims.put("iss", getCredentials.getORG_ID());
                jwtClaims.put("sub", getCredentials.getTECH_ACCT());
                jwtClaims.put("exp", expirationTime);
                jwtClaims.put("aud", "https://" + getCredentials.getIMS_ENDPOINT() + "/c/" + getCredentials.getCLIENT_ID());
                String metascopes[] = new String[] { getCredentials.getMETASCOPE_ID() };

                for (String metascope: metascopes)
                {
                            jwtClaims.put("https://" + getCredentials.getIMS_ENDPOINT() + "/s/" + metascope, java.lang.Boolean.TRUE);
                }


                // Create the final JWT token
                String jwtToken = Jwts.builder().setClaims(jwtClaims).signWith(sa, privateKey).compact();
                    System.out.println("Got JWT Token " + jwtToken);
                    pemParser.close();
                return jwtToken;

            } catch (IOException e) {

                    System.out.println("The error is " + e.getMessage());
            }
            return null;

    }

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