Adding notification emails when questions and answers are posted to the feed.20170903

6 files changed, 142 insertions, 8 deletions

diff --git a/src/main/java/com/p4square/grow/backend/GrowBackend.java b/src/main/java/com/p4square/grow/backend/GrowBackend.java
index 4091138..c7b9f42 100644
--- a/src/main/java/com/p4square/grow/backend/GrowBackend.java
+++ b/src/main/java/com/p4square/grow/backend/GrowBackend.java
@@ -8,6 +8,7 @@ import java.io.IOException;
 
 import com.codahale.metrics.MetricRegistry;
 
+import com.p4square.grow.provider.*;
 import org.apache.log4j.Logger;
 
 import org.restlet.Application;
@@ -27,12 +28,6 @@ import com.p4square.grow.model.Question;
 import com.p4square.grow.model.TrainingRecord;
 import com.p4square.grow.model.UserRecord;
 
-import com.p4square.grow.provider.CollectionProvider;
-import com.p4square.grow.provider.Provider;
-import com.p4square.grow.provider.ProvidesQuestions;
-import com.p4square.grow.provider.ProvidesTrainingRecords;
-import com.p4square.grow.provider.ProvidesUserRecords;
-
 import com.p4square.grow.backend.resources.AccountResource;
 import com.p4square.grow.backend.resources.BannerResource;
 import com.p4square.grow.backend.resources.SurveyResource;
@@ -51,7 +46,7 @@ import com.p4square.restlet.metrics.MetricRouter;
  *
  * @author Jesse Morgan <jesse@jesterpm.net>
  */
-public class GrowBackend extends Application implements GrowData {
+public class GrowBackend extends Application implements GrowData, ProvidesNotificationService {
 
     private final static Logger LOG = Logger.getLogger(GrowBackend.class);
 
@@ -59,6 +54,7 @@ public class GrowBackend extends Application implements GrowData {
 
     private final Config mConfig;
     private final GrowData mGrowData;
+    private final NotificationService mNotificationService;
 
     public GrowBackend() {
         this(new Config(), new MetricRegistry());
@@ -70,6 +66,8 @@ public class GrowBackend extends Application implements GrowData {
         mMetricRegistry = metricRegistry;
 
         mGrowData = new DynamoGrowData(config);
+
+        mNotificationService = new SESNotificationService(config);
     }
 
     public MetricRegistry getMetrics() {
@@ -179,6 +177,9 @@ public class GrowBackend extends Application implements GrowData {
         return mGrowData.getAnswerProvider();
     }
 
+    @Override
+    public NotificationService getNotificationService() { return mNotificationService; }
+
     /**
      * Stand-alone main for testing.
      */
diff --git a/src/main/java/com/p4square/grow/backend/NotificationService.java b/src/main/java/com/p4square/grow/backend/NotificationService.java
new file mode 100644
index 0000000..1d87a70
--- /dev/null
+++ b/src/main/java/com/p4square/grow/backend/NotificationService.java
@@ -0,0 +1,15 @@
+package com.p4square.grow.backend;
+
+/**
+ * An implementation of NotificationService sends notifications.
+ */
+public interface NotificationService {
+
+    /**
+     * Send a notification from the GROW website to the notification address.
+     *
+     * @param message The notification to deliever.
+     */
+    void sendNotification(final String message);
+
+}
diff --git a/src/main/java/com/p4square/grow/backend/SESNotificationService.java b/src/main/java/com/p4square/grow/backend/SESNotificationService.java
new file mode 100644
index 0000000..58b732d
--- /dev/null
+++ b/src/main/java/com/p4square/grow/backend/SESNotificationService.java
@@ -0,0 +1,86 @@
+package com.p4square.grow.backend;
+
+import com.amazonaws.auth.AWSCredentials;
+import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
+import com.amazonaws.regions.Region;
+import com.amazonaws.regions.Regions;
+import com.amazonaws.services.simpleemail.AmazonSimpleEmailService;
+import com.amazonaws.services.simpleemail.AmazonSimpleEmailServiceClient;
+import com.amazonaws.services.simpleemail.model.*;
+import com.p4square.grow.config.Config;
+import org.apache.log4j.Logger;
+
+/**
+ * Send Notifications via SimpleEmailService.
+ */
+public class SESNotificationService implements NotificationService {
+
+    private final static Logger LOG = Logger.getLogger(SESNotificationService.class);
+
+    private final AmazonSimpleEmailService mClient;
+    private final String mSourceAddress;
+    private final Destination mDestination;
+
+    public SESNotificationService(final Config config) {
+        AWSCredentials creds;
+
+        String awsAccessKey = config.getString("awsAccessKey");
+        if (awsAccessKey != null) {
+            creds = new AWSCredentials() {
+                @Override
+                public String getAWSAccessKeyId() {
+                    return config.getString("awsAccessKey");
+                }
+                @Override
+                public String getAWSSecretKey() {
+                    return config.getString("awsSecretKey");
+                }
+            };
+        } else {
+            creds = new DefaultAWSCredentialsProviderChain().getCredentials();
+        }
+
+        mClient = new AmazonSimpleEmailServiceClient(creds);
+
+        String region = config.getString("awsRegion");
+        if (region != null) {
+            mClient.setRegion(Region.getRegion(Regions.fromName(region)));
+        }
+
+        mSourceAddress = config.getString("notificationSourceEmail");
+
+        final String dest = config.getString("notificationEmail");
+        if (dest != null) {
+            mDestination = new Destination().withToAddresses(dest);
+        } else {
+            // Notifications are not configured.
+            mDestination = null;
+        }
+    }
+
+    @Override
+    public void sendNotification(final String message) {
+        try {
+            if (mSourceAddress == null || mDestination == null) {
+                // Disable notifications if there is no source address configured.
+                LOG.debug("Notifications are disabled because source or destination emails are not configured.");
+                return;
+            }
+
+            Message msg = new Message()
+                    .withSubject(new Content().withCharset("UTF-8").withData("Grow Notification"))
+                    .withBody(new Body()
+                            .withText(new Content().withCharset("UTF-8").withData(message)));
+
+            SendEmailRequest request = new SendEmailRequest()
+                    .withDestination(mDestination)
+                    .withSource(mSourceAddress)
+                    .withMessage(msg);
+
+            mClient.sendEmail(request);
+
+        } catch (Exception e) {
+            LOG.warn("Failed to send notification email", e);
+        }
+    }
+}
diff --git a/src/main/java/com/p4square/grow/backend/feed/ThreadResource.java b/src/main/java/com/p4square/grow/backend/feed/ThreadResource.java
index e8f46c2..12ec899 100644
--- a/src/main/java/com/p4square/grow/backend/feed/ThreadResource.java
+++ b/src/main/java/com/p4square/grow/backend/feed/ThreadResource.java
@@ -9,6 +9,8 @@ import java.io.IOException;
 import java.util.Date;
 import java.util.Map;
 
+import com.p4square.grow.backend.NotificationService;
+import com.p4square.grow.provider.ProvidesNotificationService;
 import org.restlet.data.Status;
 import org.restlet.resource.ServerResource;
 import org.restlet.representation.Representation;
@@ -31,6 +33,8 @@ public class ThreadResource extends ServerResource {
     private String mTopic;
     private String mThreadId;
 
+    private NotificationService mNotifier;
+
     @Override
     public void doInit() {
         super.doInit();
@@ -38,6 +42,8 @@ public class ThreadResource extends ServerResource {
         mBackend = (FeedDataProvider) getApplication();
         mTopic = getAttribute("topic");
         mThreadId = getAttribute("thread");
+
+        mNotifier = ((ProvidesNotificationService) getApplication()).getNotificationService();
     }
 
     /**
@@ -94,6 +100,10 @@ public class ThreadResource extends ServerResource {
             String collectionKey = mTopic + "/" + mThreadId;
             mBackend.getMessageProvider().put(collectionKey, message.getId(), message);
 
+            // Send a notification email
+            mNotifier.sendNotification(
+                    String.format("A new response was posted on the %s topic:\n\n%s", mTopic, message.getMessage()));
+
             setLocationRef(mThreadId + "/" + message.getId());
             return new JacksonRepresentation(message);
 
diff --git a/src/main/java/com/p4square/grow/backend/feed/TopicResource.java b/src/main/java/com/p4square/grow/backend/feed/TopicResource.java
index 24b6a92..914e52c 100644
--- a/src/main/java/com/p4square/grow/backend/feed/TopicResource.java
+++ b/src/main/java/com/p4square/grow/backend/feed/TopicResource.java
@@ -9,6 +9,8 @@ import java.io.IOException;
 import java.util.Date;
 import java.util.Map;
 
+import com.p4square.grow.backend.NotificationService;
+import com.p4square.grow.provider.ProvidesNotificationService;
 import org.restlet.data.Status;
 import org.restlet.resource.ServerResource;
 import org.restlet.representation.Representation;
@@ -31,12 +33,16 @@ public class TopicResource extends ServerResource {
     private FeedDataProvider mBackend;
     private String mTopic;
 
+    private NotificationService mNotifier;
+
     @Override
     public void doInit() {
         super.doInit();
 
         mBackend = (FeedDataProvider) getApplication();
         mTopic = getAttribute("topic");
+
+        mNotifier = ((ProvidesNotificationService) getApplication()).getNotificationService();
     }
 
     /**
@@ -86,7 +92,7 @@ public class TopicResource extends ServerResource {
         try {
             // Deserialize the incoming message.
             JacksonRepresentation<MessageThread> jsonRep =
-                new JacksonRepresentation<MessageThread>(entity, MessageThread.class);
+                new JacksonRepresentation<>(entity, MessageThread.class);
 
             // Get the message from the request.
             // Throw away the wrapping MessageThread because we'll create our own later.
@@ -105,6 +111,11 @@ public class TopicResource extends ServerResource {
 
             mBackend.getThreadProvider().put(mTopic, newThread.getId(), newThread);
 
+            // Send a notification email
+            mNotifier.sendNotification(
+                    String.format("A new question was posted on the %s topic:\n\n%s", mTopic, message.getMessage()));
+
+
             setLocationRef(mTopic + "/" + newThread.getId());
             return new JacksonRepresentation(newThread);
 
diff --git a/src/main/java/com/p4square/grow/provider/ProvidesNotificationService.java b/src/main/java/com/p4square/grow/provider/ProvidesNotificationService.java
new file mode 100644
index 0000000..c6166ae
--- /dev/null
+++ b/src/main/java/com/p4square/grow/provider/ProvidesNotificationService.java
@@ -0,0 +1,11 @@
+package com.p4square.grow.provider;
+
+import com.p4square.grow.backend.NotificationService;
+
+/**
+ * Indicates that the class can provide a NotificationService instance.
+ */
+public interface ProvidesNotificationService {
+
+    NotificationService getNotificationService();
+}