/**
* Subscribe a given commenter to future comments posted to the given entry.
*
* @param entry the entry to subscribe the commenter to
* @param commenter the commenter to be subscribed
* @return the result returned by AWS
*/
public SubscribeResult subscribe(Entry entry, Commenter commenter) {
if (StringUtils.isEmpty(entry.getSnsArn())) {
// If ARN isn't set then entry didn't have an SNS topic created with it so we ignore
logger.log(Level.WARNING, "Entry did not have an SNS topic associated with it");
return null;
}
SubscribeRequest request =
new SubscribeRequest(entry.getSnsArn(), EMAIL_PROTOCOL, commenter.getEmail());
SubscribeResult result = snsClient.subscribe(request);
return result;
}
/**
* Publishes a comment to the specified entry. The method takes the comment and builds an SNS
* PublishRequest object. Then the comment is published to the topic associated with the incoming
* entry.
*
* @param entry the entry to publish to
* @param comment the comment to publish
* @return the result returned from AWS
*/
public PublishResult publish(Entry entry, Comment comment) {
PublishRequest request = new PublishRequest();
request.setTopicArn(entry.getSnsArn());
StringBuilder subject = new StringBuilder("Comment Posted to Entry '");
subject.append(entry.getTitle()).append("'");
request.setSubject(subject.toString());
StringBuilder body = new StringBuilder();
body.append("The following comment was posted to the post '")
.append(entry.getTitle())
.append("'\n");
body.append("Posted by: ").append(comment.getCommenter().getName()).append("\n\n");
body.append(comment.getBody());
request.setMessage(body.toString());
return snsClient.publish(request);
}
/**
* Deletes a previously created topic associated with the entry.
*
* @param entry the entry to be deleted
*/
public void deleteTopic(Entry entry) {
DeleteTopicRequest request = new DeleteTopicRequest(entry.getSnsArn());
snsClient.deleteTopic(request);
}
/**
* Creates the SNS topic associated with an entry. When the topic is created, we will get an ARN
* (Amazon Resource Name) which uniquely identifies the SNS topic. We write that ARN to the entry
* entity so that we can refer to it later when subscribing commenters, etc.
*
* @param entry the new entry that's associated with the topic
* @return the result returned from AWS
*/
public CreateTopicResult createTopic(Entry entry) {
CreateTopicRequest request = new CreateTopicRequest(getTopicName(entry));
CreateTopicResult result = snsClient.createTopic(request);
entry.setSnsArn(result.getTopicArn());
return result;
}
/**
* This method returns a unique topic name by using the entry id.
*
* @param entry the entry to get a topic name for
* @return returns the topic name
*/
private String getTopicName(Entry entry) {
return "entry" + StageUtils.getResourceSuffixForCurrentStage() + "-" + entry.getId();
}