How to download shared image in Mirror API using .NET - google-mirror-api

Question

I have subscribed timeline notification in my Glassware app. I got notification when user shared an image with Glassware contest. Now I need to download that image to my Glassware application to do the processing.
Notification notification =
new NewtonsoftJsonSerializer().Deserialize<Notification>(Request.InputStream);
String userId = notification.UserToken;
MirrorService service = new MirrorService(new BaseClientService.Initializer()
{
Authenticator = Utils.GetAuthenticatorFromState(Utils.GetStoredCredentials(userId))
});
if (notification.Collection == "timeline")
{
foreach (UserAction action in notification.UserActions)
{
if (action.Type == "SHARE")
{
TimelineItem item = service.Timeline.Get(notification.ItemId).Fetch();
//i have to download content here.
break;
}
else
{
Console.WriteLine(
"I don't know what to do with this notification: " + action.ToString());
}
}
}

Answer 1

Downloading an attachment is described in the reference guide:
using System;
using Google.Apis.Mirror.v1;
using Google.Apis.Mirror.v1.Data;
using System.Net;
using System.IO;
public class MyClass {
// ...
/// <summary>
/// Print an attachment's metadata.
/// </summary>
/// <param name="service">Authorized Mirror service.</param>
/// <param name="itemId">ID of the timeline item the attachment belongs to.</param>
/// <param name="attachmentId">ID of the attachment to print metadata for.</param>
public static void PrintAttachmentMetadata(
MirrorService service, String itemId, String attachmentId) {
try {
Attachment attachment = service.Timeline.Attachments.Get(itemId, attachmentId).Fetch();
Console.WriteLine("Attachment content type: " + attachment.ContentType);
Console.WriteLine("Attachment content URL: " + attachment.ContentUrl);
} catch (Exception e) {
Console.WriteLine("An error occurred: " + e.Message);
}
}
/// <summary>
/// Download a timeline items's attachment.
/// </summary>
/// <param name="service">Authorized Mirror service.</param>
/// <param name="attachment">Attachment to download content for.</param>
/// <returns>Attachment's content if successful, null otherwise.</returns>
public static System.IO.Stream DownloadAttachment(
MirrorService service, Attachment attachment) {
try {
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
new Uri(attachment.ContentUrl));
service.Authenticator.ApplyAuthenticationToRequest(request);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK) {
return response.GetResponseStream();
} else {
Console.WriteLine(
"An error occurred: " + response.StatusDescription);
return null;
}
} catch (Exception e) {
Console.WriteLine("An error occurred: " + e.Message);
return null;
}
}
// ...
}