BAEL-1248 google sheets api example (#3189)

* google sheets api example

* add dependencies

* rename test

* update test

* add comment

* trigger build

* trigger build

* Formatting to standards

* Getting rid of stray tabs

* Applying formatting rules to source files as well

* trigger build

libraries/src/main/java/com/baeldung/google/sheets/GoogleAuthorizeUtil.java

@@ -0,0 +1,42 @@
+package com.baeldung.google.sheets;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.security.GeneralSecurityException;
+import java.util.Arrays;
+import java.util.List;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
+import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
+import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
+import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.client.util.store.MemoryDataStoreFactory;
+import com.google.api.services.sheets.v4.SheetsScopes;
+
+public class GoogleAuthorizeUtil {
+    public static Credential authorize() throws IOException, GeneralSecurityException {
+        InputStream in = GoogleAuthorizeUtil.class.getResourceAsStream("/google-sheets-client-secret.json");
+        GoogleClientSecrets clientSecrets = GoogleClientSecrets
+          .load(JacksonFactory.getDefaultInstance(), new InputStreamReader(in));
+
+        List<String> scopes = Arrays.asList(SheetsScopes.SPREADSHEETS);
+
+        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow
+          .Builder(GoogleNetHttpTransport.newTrustedTransport(), 
+                   JacksonFactory.getDefaultInstance(),
+                   clientSecrets,
+                   scopes)
+          .setDataStoreFactory(new MemoryDataStoreFactory())
+          .setAccessType("offline")
+          .build();
+        Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver())
+          .authorize("user");
+
+        return credential;
+    }
+
+}

libraries/src/main/java/com/baeldung/google/sheets/SheetsServiceUtil.java

@@ -0,0 +1,23 @@
+package com.baeldung.google.sheets;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.services.sheets.v4.Sheets;
+
+public class SheetsServiceUtil {
+
+    private static final String APPLICATION_NAME = "Google Sheets Example";
+
+    public static Sheets getSheetsService() throws IOException, GeneralSecurityException {
+        Credential credential = GoogleAuthorizeUtil.authorize();
+        return new Sheets.Builder(GoogleNetHttpTransport.newTrustedTransport(), 
+                                  JacksonFactory.getDefaultInstance(), credential)
+          .setApplicationName(APPLICATION_NAME)
+          .build();
+    }
+
+}