Store scores to a Google Sheet

demo/src/main/java/com/example/application/data/FeedbackSheet.java

@@ -0,0 +1,127 @@
+package com.example.application.data;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.GeneralSecurityException;
+import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.List;
+
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.http.javanet.NetHttpTransport;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.sheets.v4.Sheets;
+import com.google.api.services.sheets.v4.SheetsScopes;
+import com.google.api.services.sheets.v4.model.ValueRange;
+import com.google.auth.oauth2.ServiceAccountCredentials;
+
+/* Class to store feedack into a Google Sheet. 
+ * 
+ * This needs a Google Service Account to be set up first and give 'editor' 
+ * permissions to that account in the specified sheet.
+ * 
+ * 
+ */
+public class FeedbackSheet {
+
+    private static final String APPLICATION_NAME = "NPS Feedback App";
+
+    private static final List<String> AUTH_SCOPES = List.of(SheetsScopes.SPREADSHEETS);
+
+    private static final String RANGE = "Sheet1";
+
+    private static final GsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();
+
+    private String credentialsFilePath;
+    private ServiceAccountCredentials loadedCredentials;
+    private Sheets loadedService;
+
+    private String sheetId;
+
+    public FeedbackSheet(String sheetId, String credentialsFilePath) {
+        this.sheetId = sheetId;
+        this.credentialsFilePath = credentialsFilePath;
+    }
+
+    /**
+     * Append a user score to the spreadsheet.
+     * 
+     * Adds a new row in the first sheet in a Google Spreadsheet
+     * with timestamp userId and given NPS score.
+     * 
+     * <code>2023-06-26 11:09:44,1687640813,	10</code>
+     * 
+     * @param anonymousUserId Unique but anonymous I
+     * @param score           NPS score
+     */
+    public void append(String anonymousUserId, int score) {
+        try {
+            List<List<Object>> values = Arrays.asList(
+                    Arrays.asList(LocalDateTime.now().toString(), anonymousUserId, score));
+
+            ValueRange newEntry = new ValueRange().setValues(values);
+            Sheets service = getSheetsService();
+            service.spreadsheets().values()
+                    .append(this.sheetId, RANGE, newEntry)
+                    .setValueInputOption("USER_ENTERED")
+                    .setAccessToken(getCredentials().getAccessToken().getTokenValue())
+                    .execute();
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to append Google Sheet", e);
+        }
+    }
+
+    /**
+     * Initialize and get Google Sheets service.
+     *
+     * @return Sheets service to perform operations.
+     * @throws IOException
+     * @throws GeneralSecurityException
+     */
+    public Sheets getSheetsService() throws IOException, GeneralSecurityException {
+        if (this.loadedService == null) {
+            NetHttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
+            this.loadedService = new Sheets.Builder(httpTransport, JSON_FACTORY, request -> {
+            })
+                    .setApplicationName(APPLICATION_NAME)
+                    .build();
+        }
+        return this.loadedService;
+    }
+
+    /**
+     * Load and create new ServiceAccountCredential instance.
+     *
+     * Loads the credentials from json file specified by
+     * <code>gapi.credentials.file.path</code>.
+     * Once successfully loaded, calling this will return the same credential
+     * instance.
+     *
+     * @return An authorized Credential object.
+     * @throws IOException If the credentials.json file cannot be found.
+     */
+    protected ServiceAccountCredentials getCredentials() throws IOException {
+
+        if (this.loadedCredentials != null) {
+            if (this.loadedCredentials.getAccessToken().getExpirationTime().before(new Date())) {
+                this.loadedCredentials.refresh();
+            }
+            return this.loadedCredentials;
+        }
+
+        InputStream in = new FileInputStream(credentialsFilePath);
+        if (in == null) {
+            throw new FileNotFoundException("Credentials not found: " + credentialsFilePath);
+        }
+
+        this.loadedCredentials = (ServiceAccountCredentials) ServiceAccountCredentials
+                .fromStream(new FileInputStream(credentialsFilePath))
+                .createScoped(AUTH_SCOPES);
+        this.loadedCredentials.refresh();
+        return this.loadedCredentials;
+    }
+
+}

demo/src/main/java/com/example/application/views/empty/FeedbackView.java

@@ -32,6 +32,11 @@ public FeedbackView() {
             header.setText("Thank You");
             replace(nps, thankYou);
             add(closeLink);
+
+            // Store the results into a Google Sheet
+            FeedbackSheet feedbackSheet = new FeedbackSheet("1aTfU2_XuZU-HgUhSBu4_oB_gB4hhro-RzNsdN9_8YX8",
+                    "/workspaces/nps/.devcontainer/local/service_account_credentials.json");
+            feedbackSheet.append("" + UI.getCurrent().hashCode(), e.getValue());
         });
 
         // Styling