private static async Task SaveEvent(BoxEvent eventData, string payload)
{
var endpointUrl = ConfigSettings.CosmosDbEndpointUrl;
var primaryKey = ConfigSettings.CosmosDbPrimaryKey;
var databaseId = ConfigSettings.CosmosDbDatabaseId;
var databaseCollection = ConfigSettings.CosmosDbDatabaseCollection;
var client = new DocumentClient(new Uri(endpointUrl), primaryKey);
await client.CreateDatabaseIfNotExistsAsync(new Database { Id = databaseId });
var eventCollection = new DocumentCollection {
Id = databaseCollection
};
eventCollection.PartitionKey.Paths.Add("/userId");
await client.CreateDocumentCollectionIfNotExistsAsync(
UriFactory.CreateDatabaseUri(databaseId),
eventCollection,
new RequestOptions { OfferThroughput = 2500 });
await client.CreateDocumentAsync(
UriFactory.CreateDocumentCollectionUri(databaseId, databaseCollection),
new EventData
{
FileId = eventData.Source.Id,
FileName = eventData.Source.Name,
FileEtag = eventData.Source.Etag,
FileSize = eventData.Source.Size,
UserId = eventData.CreatedBy.Id,
CreatedAt = eventData.Source.CreatedAt,
EventId = eventData.Id,
Data = payload
});
}
private static string ValidateContent(BoxEvent eventData, TraceWriter log)
{
var message = new StringWriter();
message.Write($"Webhook = {eventData.Webhook.Id}");
// The event trigger: FILE.UPLOADED
if (!eventData.Trigger.Equals("FILE.UPLOADED"))
{
return("statusCode: 400, body: 'FILE.UPLOADED event is expected' }");
}
message.Write($"trigger = {eventData.Trigger}");
// The source that triggered the event: a file, folder, etc.
if (eventData.Source == null)
{
return("statusCode: 400, body: 'Source is not present in the webhook event'");
}
message.Write($"source = {eventData.Source.Type}");
message.Write($"id = {eventData.Source.Id}");
message.Write($"name = {eventData.Source.Name ?? "unknown"}");
//log the request content details
log.Info($"Box event: { message} ");
return(null);
}
public async Task <Stream> GetFileAsync(BoxEvent eventData)
{
if (eventData == null)
{
throw new ArgumentNullException(nameof(eventData));
}
return(await userClient.FilesManager.DownloadStreamAsync(eventData.Source.Id));
}
public static async Task <object> Run([HttpTrigger(WebHookType = "genericJson")] HttpRequestMessage req, TraceWriter log)
{
log.Info($"Box Webhook was triggered!");
string jsonContent = await req.Content.ReadAsStringAsync();
BoxEvent eventData = JsonConvert.DeserializeObject <BoxEvent>(jsonContent);
//Validate webhook event payload
var message = ValidateContent(eventData, log);
if (!string.IsNullOrEmpty(message))
{
return(req.CreateErrorResponse(HttpStatusCode.BadRequest, message));
}
//save webhook event and payload in Azure Cosmos DB
await SaveEvent(eventData, jsonContent);
//Configure and create Box object
var box = new Box(eventData.CreatedBy.Id, log);
//Get file from Box and analyze image with Cognitive Vision API to generate metadata
var vision = new Vision(ConfigSettings.AzureComputerVisionApiKey);
var analysisResult = await vision.Analyze(await box.GetFileAsync(eventData));
log.Info($"Image analysis: {JsonConvert.SerializeObject(analysisResult) ?? "results empty"}");
//Add metadats to file in Box
var metadata = analysisResult.Tags.ToDictionary <Tag, string, object>(tag => tag.Name, tag => tag.Confidence.ToString(CultureInfo.InvariantCulture));
var result = await box.AddMetaData(eventData.Source.Id, metadata);
log.Info($"Add metadata results: {JsonConvert.SerializeObject(result)}");
return(req.CreateResponse(HttpStatusCode.OK, $"Successsfully analyzed and added metadata to file { eventData.Source.Name }"));
}
public static string ToJson(this BoxEvent self)
{
return(JsonConvert.SerializeObject(self, Converter.Settings));
}