From e9661fdf78161ae9b565619b5b280c31b99f1de6 Mon Sep 17 00:00:00 2001
From: atusa17 <alex.j.tusa@gmail.com>
Date: Sun, 10 Mar 2019 11:48:34 -0600
Subject: [PATCH] PAN-60 created initial RestService

---
 services/build.gradle                         |  6 +-
 .../msudenver/tsp/services/RestService.java   | 99 +++++++++++++++++++
 2 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 services/src/main/java/edu/msudenver/tsp/services/RestService.java

diff --git a/services/build.gradle b/services/build.gradle
index a53319f..05efbeb 100644
--- a/services/build.gradle
+++ b/services/build.gradle
@@ -19,6 +19,10 @@ repositories {
 
 dependencies {
     compile project(':persistence')
-    testCompile group: 'junit', name: 'junit', version: '4.12'
+    compile group: 'org.apache.httpcomponents', name: 'httpcore', version: '4.4.11'
+    compile group: 'org.apache.httpcomponents', name: 'fluent-hc', version: '4.5.7'
+    compile group: 'com.google.code.gson', name: 'gson', version: '2.7'
     compile fileTree(dir: 'lib', include: '**/*.jar')
+    
+    testCompile group: 'junit', name: 'junit', version: '4.12'
 }
diff --git a/services/src/main/java/edu/msudenver/tsp/services/RestService.java b/services/src/main/java/edu/msudenver/tsp/services/RestService.java
new file mode 100644
index 0000000..d9473a2
--- /dev/null
+++ b/services/src/main/java/edu/msudenver/tsp/services/RestService.java
@@ -0,0 +1,99 @@
+package edu.msudenver.tsp.services;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.fluent.Request;
+import org.apache.http.util.EntityUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Slf4j
+@Service
+public class RestService {
+    private static final Gson GSON = new Gson();
+    private final RequestFactory requestFactory;
+
+    @Autowired
+    public RestClient(final RequestFactory requestFactory) {
+        this.requestFactory = requestFactory;
+    }
+
+    public boolean delete(final String uri, final Integer connectionTimeout, final Integer socketTimeout, final HttpStatus httpStatus) {
+        LOG.info("Sending DELETE {}", uri);
+        final Optional<HttpResponse> response = send(requestFactory.delete(uri), null, connectionTimeout, socketTimeout);
+
+        return response.isPresent() && response.get().getStatusLine().getStatusCode() == httpStatus.value();
+    }
+
+    <T> Optional<T> get(final String uri, final TypeToken<T> type, final Integer connectionTimeout, final Integer socketTimeout, final String auth) {
+        LOG.info("Sending GET {}", uri);
+        return send(requestFactory.get(uri), auth, connectionTimeout, socketTimeout, type);
+    }
+
+    <T> Optional<T> post(final String uri, final String requestJson, final TypeToken<T> type, final Integer connectionTimeout, final Integer socketTimeout) {
+        LOG.info("Sending POST {} with body: {}", uri, requestJson);
+        return send(requestFactory.post(uri, requestJson), null, connectionTimeout, socketTimeout, type);
+    }
+
+    Optional<HttpResponse> post(final String uri, final String requestJson, final Integer connectionTimeout, final Integer socketTimeout) {
+        LOG.info("Sending POST {} with body: {}", uri, requestJson);
+        return send(requestFactory.post(uri, requestJson), null, connectionTimeout, socketTimeout);
+    }
+
+    <T> Optional<T> put(final String uri, final String requestJson, final TypeToken<T> type, final Integer connectionTimeout, final Integer socketTimeout, final String auth) {
+        LOG.info("Sending PUT {} with body: {}", uri, requestJson);
+        return send(requestFactory.put(uri, requestJson), auth, connectionTimeout, socketTimeout, type);
+    }
+
+    private <T> Optional<T> send(final Request request, final String auth, final Integer connectionTimeout, final Integer socketTimeout, final TypeToken<T> type) {
+        try {
+            final Optional<HttpResponse> optionalHttpResponse = send(request, auth, connectionTimeout, socketTimeout);
+            if (optionalHttpResponse.isPresent()) {
+                final HttpResponse httpResponse = optionalHttpResponse.get();
+                LOG.info("Received {} response", httpResponse.getStatusLine().getStatusCode());
+
+                final String jsonResponse = httpResponse.getEntity() == null ? null : EntityUtils.toString(httpResponse.getEntity());
+                if (StringUtils.isNotBlank(jsonResponse)) {
+                    final T responses = GSON.fromJson(jsonResponse, type.getType());
+                    if (responses instanceof List) {
+                        LOG.info("Found {} responses.", ((List) responses).size());
+                        if (((List) responses).isEmpty()) {
+                            return Optional.empty();
+                        }
+                    }
+
+                    return Optional.ofNullable(responses);
+                }
+            }
+        } catch (final Exception e) {
+            LOG.error("Could not send request", e);
+        }
+
+        return Optional.empty();
+    }
+
+    private Optional<HttpResponse> send(final Request request, final String auth, final Integer connectionTimeout, final Integer socketTimeout) {
+        if (StringUtils.isNotBlank(auth)) {
+            request.addHeader("Authorization", "Basic " + auth);
+        }
+
+        try {
+            return Optional.ofNullable(request.connectTimeout(connectionTimeout)
+                    .socketTimeout(socketTimeout)
+                    .execute()
+                    .returnResponse());
+        } catch (final Exception e) {
+            LOG.error("Could not send request", e);
+            return Optional.empty();
+        }
+    }
+}
+
+