//Creates a file on Google Drive and uses the specified stream to fill it with data.
//This should be used for data that is 5MB or less.
public async Task <GFile> UploadFile(GFile fileMetadata, Stream fileData, IProgress <int> progress)
{
//Create the message to send.
HttpRequestMessage message = new HttpRequestMessage();
message.Method = HttpMethod.Post;
//Use the content upload url.
message.RequestUri = new Uri("https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart"
+ "&fields=" + GFile.FileMetadataFields());
//Create JSON that represents the Google Drive file metadata.
var jsonText = GFile.ToJObject(fileMetadata).ToString();
//JSON file metadata content part.
var metadataContent = new StringContent(jsonText, Encoding.UTF8);
metadataContent.Headers.ContentLength = Encoding.UTF8.GetByteCount(jsonText);
metadataContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json; charset=UTF-8");
//Streaming file bytes content.
var fileContent = new StreamContent(fileData);
fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/zip");
//Create the content for the HTTP request. This content must be multipart content, where the first
//part is the file metadata JSON, split it using the boundary string "content_separator", and then
//the next part is the data in the stream. Note I have no idea what the subtype parameter is supposed
//to do. generic_subtype is just a random value, and it works, so I'll leave it like that.
var mainContent = new MultipartContent("generic_subtype", "content_separator");
//Add the metadata.
mainContent.Add(metadataContent);
//Add the file data.
mainContent.Add(fileContent);
//Specify the content type. Notice the boundary specified in the constructor should also be specified
//here as well.
mainContent.Headers.ContentType =
MediaTypeHeaderValue.Parse("multipart/related; boundary=content_separator");
//Add the multipart content to the actual message.
message.Content = mainContent;
//Attempt to upload the file.
var result = await _client.SendAuthorizedRequestMessage(message, progress);
if (_client.LastError != OAuthClientResult.Success)
{
return(null);
}
try
{
return(GFile.FromJObject(JObject.Parse(result)));
}
catch (Exception)
{
//An exception means parsing failed for some reason. Return null.
return(null);
}
}
//Create an empty file on Google Drive, and returns a GFile representing the file.
//Note that this does not upload any data, only creates an empty file.
public async Task <GFile> CreateFile(GFile fileMetadata)
{
//Create the message to send.
HttpRequestMessage message = new HttpRequestMessage();
//Use the metadata only url.
message.RequestUri = new Uri("https://www.googleapis.com/drive/v3/files?fields="
+ GFile.FileMetadataFields());
message.Method = HttpMethod.Post;
//Create JSON that represents the Google Drive file metadata.
var jsonText = GFile.ToJObject(fileMetadata).ToString();
//Create the content using the file metadata, converted to a JSON object.
StringContent content = new StringContent(jsonText, Encoding.UTF8);
content.Headers.ContentLength = Encoding.UTF8.GetByteCount(jsonText);
content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json; charset=UTF-8");
//Send the create file command.
var result = await _client.SendAuthorizedRequestMessage(message);
if (_client.LastError != OAuthClientResult.Success)
{
return(null);
}
try
{
return(GFile.FromJObject(JObject.Parse(result)));
}
catch (Exception)
{
//Parsing issue.
return(null);
}
}
//Creates a folder on Google Drive, and returns a GFile representing the folder.
//Set parentFolderId to "root" to specify the root folder as the parent.
public async Task <GFile> CreateFolder(string name, string description, string parentFolderId)
{
//Construct a request message to send.
HttpRequestMessage message = new HttpRequestMessage(HttpMethod.Post,
"https://www.googleapis.com/drive/v3/files?fields=" + GFile.FileMetadataFields());
//The parameters for the folder must be provided in the message body as JSON.
JObject folderData = new JObject();
folderData["name"] = name;
folderData["description"] = description;
folderData["mimeType"] = "application/vnd.google-apps.folder";
//The following makes JSON that looks like this. [{"id": "parentFolderId"}]
JArray parentArr = new JArray();
parentArr.Add(new JObject()
{
["id"] = parentFolderId
});
folderData["parents"] = parentArr;
//Convert the JSON to a string.
string json = folderData.ToString();
//Create the content.
StringContent content = new StringContent(json, Encoding.UTF8);
content.Headers.ContentLength = Encoding.UTF8.GetByteCount(json);
content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json; charset=UTF-8");
message.Content = content;
//Send the create folder command.
var result = await _client.SendAuthorizedRequestMessage(message);
if (_client.LastError != OAuthClientResult.Success)
{
return(null);
}
//Try to parse the returned data.
try
{
return(GFile.FromJObject(JObject.Parse(result)));
}
catch (Exception)
{
//Just return null. The error at this point is a parsing issue.
return(null);
}
}
