/// <summary>
/// Process the form values that were submitted to construct a file name.
/// Make sure all form items come before the actual file data payload.
/// </summary>
public override string GetLocalFileName(HttpContentHeaders headers)
{
// Construct a JSON object so the Serializer will get our types for us
var jsonBuilder = new StringBuilder("{");
var flowMetaDictionary = new Dictionary<string, string>();
foreach (var item in this.Contents)
{
var param = item.Headers.ContentDisposition.Parameters.FirstOrDefault();
string key = param.Value.Trim('\"');
string value = item.ReadAsStringAsync().Result;
// Possible way to parse value as JSON:
//MyObject myObj = JsonConvert.DeserializeObject<MyObject>(value);
// Instead, we'll try to put everything into a FlowMetadata object
jsonBuilder.AppendFormat("\"{0}\":\"{1}\",",key,value);
flowMetaDictionary[key] = value;
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1); // remove the last ',' character
jsonBuilder.Append("}"); // close the json
// Allow for dynamic properties: Adding a property to the class means you don't have to remember
// to add it to the constructor
var dynamicMetaData = JsonConvert.DeserializeObject<FlowMetaData>(jsonBuilder.ToString());
// Strict properties: you have to specify each property in the constructor and handle it yourself
var strictMetaData = new FlowMetaData(flowMetaDictionary);
// I like the dynamic method much better, much more maintainable
MetaData = dynamicMetaData;
return MetaData.FlowFilename;
// If you wanted to save each chunk individually and stitch it together later (bad performance in my opinion):
//var flowChunkName = String.Format("{0}.{1}", MetaData.flowFilename, MetaData.FlowChunkNumber);
//return flowChunkName;
}
/// <summary>
/// (Thread Safe) Marks a chunk as recieved.
/// </summary>
private static bool RegisterSuccessfulChunk(FlowMetaData chunkMeta)
{
FileMetaData fileMeta;
lock (chunkCacheLock)
{
fileMeta = GetFileMetaData(chunkMeta.FlowIdentifier);
if (fileMeta == null)
{
fileMeta = new FileMetaData(chunkMeta);
uploadChunkCache.Add(chunkMeta.FlowIdentifier, fileMeta, DefaultCacheItemPolicy());
}
fileMeta.RegisterChunkAsReceived(chunkMeta);
if (fileMeta.IsComplete)
{
// Since we are using a cache and memory is automatically disposed,
// we don't need to do this, so we won't so we can keep a record of
// our completed uploads.
//uploadChunkCache.Remove(chunkMeta.FlowIdentifier);
}
}
return fileMeta.IsComplete;
}
public bool HasChunk(FlowMetaData flowMeta)
{
return ChunkArray[ChunkIndex(flowMeta.FlowChunkNumber)];
}
public void RegisterChunkAsReceived(FlowMetaData flowMeta)
{
ChunkArray[ChunkIndex(flowMeta.FlowChunkNumber)] = true;
TotalChunksReceived++;
}
public FileMetaData(FlowMetaData flowMeta)
{
FlowMeta = flowMeta;
ChunkArray = new bool[flowMeta.FlowTotalChunks];
TotalChunksReceived = 0;
}
public static bool HasRecievedChunk(FlowMetaData chunkMeta)
{
var fileMeta = GetFileMetaData(chunkMeta.FlowIdentifier);
bool wasRecieved = fileMeta != null && fileMeta.HasChunk(chunkMeta);
return wasRecieved;
}
