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);
}
}
private async Task <IHttpActionResult> SaveAttachmentsWithDistinctTokens(SaveAttachmentRequest request)
{
// Validate request
if (request == null || !request.IsValid())
{
return(BadRequest("One or more parameters is missing."));
}
// Initialize a Graph client
GraphServiceClient graphClient = new GraphServiceClient(
new DelegateAuthenticationProvider(
(requestMessage) => {
// Add the OneDrive access token to each outgoing request
requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", request.oneDriveToken);
return(Task.FromResult(0));
}));
// First get the attachments from the message
// The token we get from the add-in is valid for the Outlook API,
// not the Microsoft Graph API. That means we need to invoke the
// Outlook endpoint directly, and we can't use the Graph library.
// Build the request URI to the message attachments collection
string baseAttachmentsUri = request.outlookRestUrl;
if (!baseAttachmentsUri.EndsWith("/"))
{
baseAttachmentsUri += "/";
}
baseAttachmentsUri += "v2.0/me/messages/" + request.messageId + "/attachments/";
using (var client = new HttpClient())
{
foreach (string attachmentId in request.attachmentIds)
{
var getAttachmentReq = new HttpRequestMessage(HttpMethod.Get, baseAttachmentsUri + attachmentId);
// Headers
getAttachmentReq.Headers.Authorization = new AuthenticationHeaderValue("Bearer", request.outlookToken);
getAttachmentReq.Headers.UserAgent.Add(new ProductInfoHeaderValue("AttachmentsDemoOutlookAddin", "1.0"));
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);
// Is this a file or an Outlook item?
if (attachment.Type.ToLower().Contains("itemattachment"))
{
// Currently REST API doesn't support access to the MIME stream
// So for now, just get the JSON representation of the attached item and save it
// as a JSON file
var getAttachedItemJsonReq = new HttpRequestMessage(HttpMethod.Get, baseAttachmentsUri +
attachmentId + "?$expand=Microsoft.OutlookServices.ItemAttachment/Item");
getAttachedItemJsonReq.Headers.Authorization = new AuthenticationHeaderValue("Bearer", request.outlookToken);
getAttachedItemJsonReq.Headers.UserAgent.Add(new ProductInfoHeaderValue("AttachmentsDemoOutlookAddin", "1.0"));
getAttachedItemJsonReq.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var getAttachedItemResult = await client.SendAsync(getAttachedItemJsonReq);
Stream jsonAttachedItem = await getAttachedItemResult.Content.ReadAsStreamAsync();
bool success = await SaveFileToOneDrive(graphClient, attachment.Name + ".json", jsonAttachedItem);
if (!success)
{
return(BadRequest(string.Format("Could not save {0} to OneDrive", attachment.Name)));
}
}
else
{
// For files, we can build a stream directly from ContentBytes
if (attachment.Size < (4 * 1024 * 1024))
{
MemoryStream fileStream = new MemoryStream(Convert.FromBase64String(attachment.ContentBytes));
bool success = await SaveFileToOneDrive(graphClient, attachment.Name, fileStream);
if (!success)
{
return(BadRequest(string.Format("Could not save {0} to OneDrive", attachment.Name)));
}
}
else
{
// TODO: Add code here to handle larger files. See:
// https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/item_createuploadsession
// and
// https://github.com/microsoftgraph/aspnet-snippets-sample/blob/master/Graph-ASPNET-46-Snippets/Microsoft%20Graph%20ASPNET%20Snippets/Models/FilesService.cs
return(BadRequest("File is too large for simple upload."));
}
}
}
}
return(Ok());
}