Server Side SDK general module

Overview

Server Side SDK is API wrapper implemented on Java. If you need SDK on another language, please contact us.

Installation

Manually deploy artifacts to your dependency management system.
Examples for local maven repository:

sdk.pom

mvn install:install-file -Dfile="sdk.pom" -DpomFile="sdk.pom"

core.jar using core.pom

mvn install:install-file -Dfile="core.jar" -DpomFile="core.pom"

api-client.jar using api-client.pom

mvn install:install-file -Dfile="api-client.jar" -DpomFile="api-client.pom"

Requirements

Java 1.8 or later

Gradle users

Add this dependency to your project's build file:

implementation "net.payrdr.integrations:api-client:1.0.0"

Maven users

Add this dependency to your project's POM:

<dependency>
    <groupId>net.payrdr.integrations</groupId>
    <artifactId>api-client</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

Usage

Basic usage with minimal configuration:

import net.payrdr.integrations.sdk.apiclient.regiserOrder.RegisterOrderResponse;
import net.payrdr.integrations.sdk.apiclient.regiserOrder.RegisterOrderRequest;
import net.payrdr.integrations.sdk.apiclient.ApiClient;

public class ApiExample {

   public static void main(String[] args) {
       ApiClient client = new ApiClient.Builder()
              .username(username)
              .password(password)
              .baseUrl(baseUrl)
              .build();

      RegisterOrderRequest request = RegisterOrderRequest.builder()
              .setAmount(10000)
              .setReturnUrl("https://mybestmerchantreturnurl.com")
              .build();

      RegisterOrderResponse response = client.registerOrder(request);
   }
}

Configuration

Base URL

Static URL prefix for every API method.
Example: https://uat.dskbank.bg/payment/rest/register.do . Here:

https://uat.dskbank.bg/payment - base prefix
/rest/register.do - exact method reference

Only HTTPS protocol is supported.

Request authentication customization

Configured authenticator would be used by default in API client.

Prebuilt authentication options:

Username and password can be configured using ApiClient.Builder.username(String) along with ApiClient.Builder.password(String) methods. Builder would raise a ConfigurationException in case when only username or only password is provided.
Merchant token can be configured via ApiClient.Builder.token(String). ConfigurationException is thrown when the token is passed with username or password.
Noop authentication. When neither username and password nor token is passed.

If built-in authentication methods are not enough, feel free to extend net.payrdr.integrations.sdk.apiclient.ApiRequestAuthenticator and provide it to the builder via authenticator(ApiRequestAuthenticator) method.

Enabling request signature

To have a possibility to sign requests, first contact technical support service to enable signatures for you. Then upload a certificate using Merchant Portal.

You need to provide a key pair to ApiClient to generate a hash and a signature using your secret key in the process of sending a request.

Private RSA key can be configured in two ways:

(Default way) Create net.payrdr.integrations.sdk.apiclient.PrivateKeyInfo with the parameters:

String type - one of "PKCS8", "JKS", "PKCS12" supported keystore types.
String path - absolute path to keystore file. ConfigurationException is thrown if the keystore is not readable.
String password - keystore password AND entry password. Both should be protected with the same password. Used with "JKS" and "PKCS12" keystore types.
String alias - keystore entry alias for desired key. Used with "JKS" and "PKCS12" keystore types.

import net.payrdr.integrations.sdk.apiclient.ApiClient;

  public class ApiExample {

     public static void main(String[] args) {
         ApiClient client = new ApiClient.Builder()
                .username(username)
                .password(password)
                .baseUrl(baseUrl)
                .keyInfo(PrivateKeyInfo.builder()
                         .path("/some/absolute/keystore/path/filename.jks")
                         .type("JKS")
                         .password("keystore_and_entry_password")
                         .alias("keystoreEntryAlias")
                         .build())
                .build();
     }
  }

Implement net.payrdr.integrations.sdk.core.security.PrivateKeyProvider interface and pass implementation to ApiClient.Builder.keyProvider(PrivateKeyProvider):

import net.payrdr.integrations.sdk.apiclient.ApiClient;

  public class ApiExample {

     public static void main(String[] args) {
         ApiClient client = new ApiClient.Builder()
                .username(username)
                .password(password)
                .baseUrl(baseUrl)
                .keyProvider(new PrivateKeyProvider() {
                  @Override
                  public PrivateKey provide() {
                    //Do some magic here and provide private rsa key
                    return null;
                  }
                })
                .build();
     }
  }

Signature algorithm

Default request signature algorithm is SHA256WithRSA. Default net.payrdr.integrations.sdk.core.security.SHA256WithRSASigner would be initialized using provided java.security.PrivateKey.

During request execution, the request body would be transformed to hash (X-Hash) and the signature value (X-Signature) and passed in the request headers.

X-Hash: GDrobAlCcpdOOlVuqra7Oogl/4s3vToGOXGpf3t/wJ0= 
    X-Signature: TJrm6jYAf2ssp/iYoDb3B+nuPqQ572oe/3a2RQ4oG2BFbmeRcoiITvR6tybNsbRHvRRlJys/2xFBW9ilee9GCN9WwYJ9h/MDyUEktj6NLZOztBAWi+7S8LDaiEWd+MUdTqe0hdiqo/lY2uIlEMTtkqTB7LsbEhrJ6NhJdpSxrstAnpyGIrGfldt0Vz+gz+YQ5XXrwhD6HyGShqV+tXzxcMdezWJJJ8vH5C0s  4jij2PuoauUSHkTrSc4vIJl/TPMliLJNsC5KCXka4/1hSr0exawFBekRldFnv5YvFakWJUN3kEc8  w3uauzTDh+CG0/Vxs/3gNun7e9ik9kCpwdiSMw==

No additional configuration is needed to use default SHA256WithRSASigner.

Custom algorithm can be implemented using net.payrdr.integrations.sdk.core.security.RequestSigner interface.
Pass your implementation to ApiClient.Builder.requestSigner(RequestSigner) method:

import net.payrdr.integrations.sdk.apiclient.ApiClient;

    public class ApiExample {

        public static void main(String[] args) {
            ApiClient client = new ApiClient.Builder()
                    .username(username)
                    .password(password)
                    .baseUrl(baseUrl)
                    .requestSigner(new RequestSigner() {
                        @Override
                        public void init(PrivateKey privateKey) {
                            //do some magic with provided private key
                        }

                        @Override
                        public void sign(HttpRequest request) {
                            // Here we can customize request signature. Key would be loaded by KeyProvider
                        }
                    })
                    .build();
        }
    }

HTTP client customization

By default, built-in HttpClient wraps HttpsUrlConnection.

Customization handles:

Request timeouts.
Default values are 60000 ms for read timeout and 5000 ms for connect timeout.
Read timeout and connect timeout may be customized via corresponding methods in ApiClient.Builder:

import net.payrdr.integrations.sdk.apiclient.ApiClient;

public class ApiExample {

    public static void main(String[] args) {
        ApiClient client = new ApiClient.Builder()
                .username(username)
                .password(password)
                .baseUrl(baseUrl)
                .readTimeout(1000) // Custom timeouts;
                .connectTimeout(2000)
                .build();
    }
}

Default TLS TrustStore can be extended or replaced:

Append single certificate from file system to trust store via customCertPath(String path) method

import net.payrdr.integrations.sdk.apiclient.ApiClient;

   public class ApiExample {
     public static void main(String[] args) {
           ApiClient client = new ApiClient.Builder()
               .username(username)
               .password(password)
               .baseUrl(baseUrl)
                // Merge certificate from file system into system trust store and provide it to httpClient
               .customCertPath("/path/to/custom/certificate.cer") // X.509 Certificate file format 
               .build();
     }
   }

Append all keystore certificates to trust store via customTrustStore(java.security.KeyStore) method

import net.payrdr.integrations.sdk.apiclient.ApiClient;

 public class ApiExample {
   public static void main(String[] args) {
        ApiClient client = new ApiClient.Builder()
            .username(username)
            .password(password)
            .baseUrl(baseUrl)
            // Merge all certificates from provided keystore with system trust store and provide it httpClient
            .customTrustStore(KeyStore.getInstance("JKS")) // Load it your own way  
            .build();
   }
 }

Replace default trust store with java.security.KeyStore using trustStore method

import net.payrdr.integrations.sdk.apiclient.ApiClient;

 public class ApiExample {

   public static void main(String[] args) {
        ApiClient client = new ApiClient.Builder()
            .username(username)
            .password(password)
            .baseUrl(baseUrl)
             // Provide custom trust store to httpClient. 
            .trustStore(KeyStore.getInstance("JKS")) //Load it your own way.
            .build();
   }
 }

Custom HTTP client implementation

HTTP client can be replaced with your own implementation using net.payrdr.integrations.sdk.core.http.(HttpClient,HttpRequest,HttpResponse) interfaces:

import net.payrdr.integrations.sdk.apiclient.ApiClient;
    import net.payrdr.integrations.sdk.core.http.HttpClient;
    import net.payrdr.integrations.sdk.core.http.HttpRequest;
    import net.payrdr.integrations.sdk.core.http.HttpResponse;

    public class ApiExample {

       public static void main(String[] args) {
            ApiClient client = new ApiClient.Builder()
                .username(username)
                .password(password)
                .baseUrl(baseUrl)
                .httpClient(new HttpClient() {
                        @Override
                        public HttpResponse execute(HttpRequest request) {
                            // do some magic and transform HttpRequest into HttpResponse
                            return null;
                        }

                        @Override
                        public HttpRequest requestInstance() {
                            // return some implementation of HttpRequest.
                            return null;
                        }
                })
                .build();
       }
    }

Serialization/deserialization customization

Content-types supported by default for request serialization:

application/json" with "application/json; charset=UTF-8" via Gson library
"application/x-www-form-urlencoded"

Cotent-types supported by default for response deserialization:

"application/json" and "application/json; charset=UTF-8" via Gson library
"text/plain;charset=utf-8"
"application/x-www-form-urlencoded"
"text/html;charset=iso-8859-1"

Customization

Custom serializer can be implemented using net.payrdr.integrations.sdk.apiclient.serialization.RequestSerializer and net.payrdr.integrations.sdk.apiclient.serialization.ResponseDeserializer interfaces.

Implementations can be registered via ApiClient.Builder.registerSerializer(RequestSerializer) and ApiClient.Builder.registerDeserializer(ResponseDeserializer) methods.

import net.payrdr.integrations.sdk.apiclient.ApiClient;

    public class ApiExample {

        public static void main(String[] args) {
            ApiClient client = new ApiClient.Builder()
                    .username(username)
                    .password(password)
                    .baseUrl(baseUrl)
                    .registerSerializer(new RequestSerializer() {

                        @Override
                        public ContentType getContentType() {
                            //register new ContentType in cache
                            return ContentType.of("custom/content-type");
                        }

                        @Override
                        public String serialize(ApiRequest request) {
                            return "MY_CUSTOM_SERIALIZATION";
                        }
                    })
                    .registerDeserializer(new ResponseDeserializer() {

                        @Override
                        public ContentType getContentType() {
                            //use registered ContentType from cache
                            return ContentType.of("custom/content-type");
                        }

                        @Override
                        public <T extends ApiResponse> T deserialize(String responseBody, Class<T> responseType) {
                            //DO THE DESERIALIZATION MAGIC IN HERE
                            return (T) new ApiResponse() {};
                        }
                    })
                    .build();
        }
    }

Also you can customize Gson library configurations using ApiClient.Builder.gson(Gson) method:

import net.payrdr.integrations.sdk.apiclient.ApiClient;

    public class ApiExample {

        public static void main(String[] args) {
            ApiClient client = new ApiClient.Builder()
                    .username(username)
                    .password(password)
                    .baseUrl(baseUrl)
                    .gson(new GsonBuilder()
                        .setFieldNamingPolicy(FieldNamingPolicy.IDENTITY)
                        .setDateFormat("yyyy-MM-dd'T'HH:mm:ss")
                        .create())
                    .build();
        }
    }

Exceptions

All exceptions are RuntimeException and can be of the following types:

ConfigurationException - thrown when ApiClient.Builder cannot properly configure client with provided settings. (For example: creating client without base URL, private key file is not readable, etc.)
SerializerNotSupportedException - thrown when corresponding serializer is not registered for request and when deserializer for response content type cannot be found.
ValidationException - thrown when the request validation failed. Contains list of errors for every validation failure.
KeystoreException - thrown when the private key information is misconfigured in some way.
RequestExecutionException - wraps an internal exceptions if something went wrong during request execution.

Building new API methods

Can be done by simple extending of net.payrdr.integrations.sdk.apiclient(ApiRequest,ApiResponse) classes.

Abstract methods of ApiRequest:

abstract List validate(); - fills ValidationError list if any validation fails
abstract String getUrl(); - relative method reference
abstract HttpMethod getMethod(); - HTTP method for request
abstract ContentType getContentType(); - content type used to determine serializer and sent via header
abstract Class getResponseType(); - response DTO type to deserialize from HTTP response

Default methods of ApiRequest:

boolean hasToBeSigned() - determines if the API request has to be signed. Bypass configured request signer. Default: true
boolean hasToBeAuthenticated() - determines if the API request has to be authenticated. Bypass configured authenticator. Default: true
Map<String, List<String>> getHeaders() - additional HTTP headers that would be merged into the HTTP request before signing process. Default: null