public async Task <string> SaveAttachmentOneDrive([FromBody] SaveAttachmentRequest request)
{
if (request == null || !request.IsValid() || request.attachmentIds.Length == 0)
{
return(null);
}
string attachmentsUrl = null;
using (var client = new HttpClient())
{
// Get content bytes
string baseAttachmentUri = request.outlookRestUrl;
if (!baseAttachmentUri.EndsWith("/"))
{
baseAttachmentUri += "/";
}
baseAttachmentUri += "v2.0/me/messages/" + request.messageId + "/attachments/";
var i = 0;
foreach (string attachmentId in request.attachmentIds)
{
var getAttachmentReq = new HttpRequestMessage(HttpMethod.Get, baseAttachmentUri + attachmentId);
// Headers
getAttachmentReq.Headers.Authorization = new AuthenticationHeaderValue("Bearer", request.outlookToken);
getAttachmentReq.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var result = await client.SendAsync(getAttachmentReq);
string json = await result.Content.ReadAsStringAsync();
OutlookAttachment attachment = JsonConvert.DeserializeObject <OutlookAttachment>(json);
// For files, build a stream directly from ContentBytes
if (attachment.Size < (4 * 1024 * 1024))
{
MemoryStream fileStream = new MemoryStream(Convert.FromBase64String(attachment.ContentBytes));
// Get access token from SQL database
var token = Data.GetUserSessionToken(Settings.GetUserAuthStateId(ControllerContext.HttpContext), Settings.AzureADAuthority);
// TODO: Check if the file already exists
attachmentsUrl = await GraphApiHelper.saveAttachmentOneDrive(token.AccessToken, Format.MakeFileNameValid(request.filenames[i]), fileStream, Format.MakeFileNameValid(request.subject));
// Format
string delete = "/" + request.filenames[i];
attachmentsUrl = attachmentsUrl.Replace(delete, "");
i++;
}
else
{
// Functionality to support > 4 MB files
// See https://docs.microsoft.com/en-us/graph/api/driveitem-createuploadsession?view=graph-rest-1.0
var token = Data.GetUserSessionToken(Settings.GetUserAuthStateId(ControllerContext.HttpContext), Settings.AzureADAuthority);
DriveItem folder = await GraphApiHelper.searchFileOneDrive(token.AccessToken, "Outlook Attachments");
var url = "https://graph.microsoft.com/v1.0" + $"/me/drive/items/{folder.Id}:/{attachment.Name}:/createUploadSession";
var uploadReq = new HttpRequestMessage(HttpMethod.Post, url);
// Headers
uploadReq.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.AccessToken);
// Send request
var sessionResponse = client.SendAsync(uploadReq).Result.Content.ReadAsStringAsync().Result;
var uploadSession = JsonConvert.DeserializeObject <UploadSessionResponse>(sessionResponse);
Upload upload = new Upload();
HttpResponseMessage response = upload.UploadFileBySession(uploadSession.uploadUrl, Convert.FromBase64String(attachment.ContentBytes));
return(folder.WebUrl);
}
}
return(attachmentsUrl);
}
}