Add a sample project with an Spring Rest Template Transport implement…

…ation.

build.gradle

@@ -4,17 +4,19 @@ plugins {
     id 'de.marcphilipp.nexus-publish' version '0.2.0'
     id 'io.codearte.nexus-staging' version '0.21.0'
     id 'com.gradle.build-scan' version '2.3'
-    id "io.freefair.lombok" version "3.8.1"
+    id 'io.freefair.lombok' version '3.8.1'
+}
+
+allprojects {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
 }
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-repositories {
-    mavenLocal()
-    mavenCentral()
-}
-
 dependencies {
     implementation 'com.google.code.gson:gson:2.8.5'
     implementation 'org.slf4j:slf4j-api:1.7.26'

samples/spring/build.gradle

@@ -0,0 +1,24 @@
+plugins {
+    id 'java'
+    id 'io.freefair.lombok'
+    id 'org.springframework.boot' version '2.1.6.RELEASE'
+}
+
+apply plugin: 'io.spring.dependency-management'
+
+sourceCompatibility = 1.12
+targetCompatibility = 1.12
+
+dependencies {
+    compile rootProject
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+
+    testCompile 'junit:junit:4.12'
+    testCompile 'org.slf4j:slf4j-simple:1.7.26'
+}
+
+test {
+    environment "CHECKOUT_PUBLIC_KEY", System.getenv("CHECKOUT_PUBLIC_KEY")
+    environment "CHECKOUT_SECRET_KEY", System.getenv("CHECKOUT_SECRET_KEY")
+    systemProperty "org.slf4j.simpleLogger.defaultLogLevel", "DEBUG"
+}

samples/spring/src/main/java/com/checkout/sample/spring/Application.java

@@ -0,0 +1,13 @@
+package com.checkout.sample.spring;
+
+import com.checkout.*;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+@SpringBootApplication
+public class Application {
+
+}

samples/spring/src/main/java/com/checkout/sample/spring/CheckoutConfig.java

@@ -0,0 +1,38 @@
+package com.checkout.sample.spring;
+
+import com.checkout.*;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+public class CheckoutConfig {
+    @Value("checkout.secretKey")
+    private String secretKey;
+    @Value("checkout.publicKey")
+    private String publicKey;
+
+    @Bean
+    public CheckoutConfiguration checkoutConfiguration() {
+        return new CheckoutConfiguration(secretKey, true, publicKey);
+    }
+
+    @Bean
+    public Serializer serializer() {
+        return new GsonSerializer();
+    }
+
+    @Bean
+    public Transport transport(CheckoutConfiguration checkoutConfiguration, RestTemplate restTemplate) {
+        return new RestTemplateTransport(checkoutConfiguration.getUri(), restTemplate);
+    }
+
+    @Bean
+    public ApiClient apiClient(Serializer serializer, Transport transport) {
+        return new ApiClientImpl(serializer, transport);
+    }
+
+    @Bean
+    public CheckoutApi checkoutApi(ApiClient apiClient, CheckoutConfiguration checkoutConfiguration) {
+        return new CheckoutApiImpl(apiClient, checkoutConfiguration);
+    }
+}

samples/spring/src/main/java/com/checkout/sample/spring/RestTemplateTransport.java

@@ -0,0 +1,72 @@
+package com.checkout.sample.spring;
+
+import com.checkout.ApiCredentials;
+import com.checkout.Transport;
+import com.checkout.common.CheckoutUtils;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.http.RequestEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.StringHttpMessageConverter;
+import org.springframework.web.client.RestTemplate;
+
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+public class RestTemplateTransport implements Transport {
+
+    private static final RestTemplate DEFAULT_REST_TEMPLATE = new RestTemplate();
+
+    static {
+        DEFAULT_REST_TEMPLATE.getMessageConverters().add(0, new StringHttpMessageConverter(StandardCharsets.UTF_8));
+    }
+
+    private final URI baseUri;
+    private final RestTemplate restTemplate;
+
+    public RestTemplateTransport(String baseUri) {
+        this(baseUri, DEFAULT_REST_TEMPLATE);
+    }
+
+    public RestTemplateTransport(String baseUri, RestTemplate restTemplate) {
+        this.baseUri = URI.create(baseUri);
+        this.restTemplate = restTemplate;
+    }
+
+    @Override
+    public CompletableFuture<Response> invoke(String httpMethod, String path, ApiCredentials apiCredentials, String jsonRequest, String idempotencyKey) {
+        RequestEntity.BodyBuilder requestBuilder = RequestEntity
+                .method(HttpMethod.resolve(httpMethod), getRequestUri(path))
+                .contentType(MediaType.APPLICATION_JSON_UTF8)
+                .accept(MediaType.APPLICATION_JSON_UTF8)
+                .acceptCharset(StandardCharsets.UTF_8)
+                .header("user-agent", "checkout-sdk-java/" + CheckoutUtils.getVersionFromManifest())
+                .header("Authorization", apiCredentials.getAuthorizationHeader());
+        if (idempotencyKey != null) {
+            requestBuilder = requestBuilder.header("Ck-Idempotency-Key", idempotencyKey);
+        }
+        RequestEntity<?> request;
+        if (jsonRequest != null) {
+            request = requestBuilder.body(jsonRequest);
+        } else {
+            request = requestBuilder.build();
+        }
+
+        return CompletableFuture.supplyAsync(() -> {
+            ResponseEntity<String> response = restTemplate.exchange(request, String.class);
+            return new Response(response.getStatusCodeValue(), response.getBody(), extractRequestId(response));
+        });
+    }
+
+    private String extractRequestId(ResponseEntity<String> response) {
+        return Optional.ofNullable(response.getHeaders().get("Ck-Request-Id"))
+                .flatMap(list -> list.stream().findFirst())
+                .orElse("NO_REQUEST_ID_SUPPLIED");
+    }
+
+    private URI getRequestUri(String path) {
+        return baseUri.resolve(path);
+    }
+}

settings.gradle

@@ -1 +1,3 @@
-rootProject.name = 'checkout-sdk-java'
+rootProject.name = 'checkout-sdk-java'
+
+include 'samples:spring'