public async Task <string> FetchAttachmentWithToken(string url, string attachmentsPath, string filenamePrefix, TokenHolder token)
{
var httpClient = new System.Net.Http.HttpClient();
try
{
var fileMetadataStr = await GetHttpContentWithToken(url, token);
Metadata obj = null;
if (fileMetadataStr != null)
{
obj = JsonConvert.DeserializeObject <Metadata>(fileMetadataStr);
}
int backOffMultiplier = 1;
begin:
var request = new System.Net.Http.HttpRequestMessage(System.Net.Http.HttpMethod.Get, url + "/$value");
//Add the token in Authorization header
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token.getToken());
var response = httpClient.SendAsync(request);
if (response.Result.IsSuccessStatusCode)
{
var content = response.Result.Content.ReadAsByteArrayAsync().Result;
string filenameSuffix = GetFilenameSuffix(response.Result.Content.Headers.ContentType.MediaType, obj);
System.IO.File.WriteAllBytes(Path.Combine(attachmentsPath, $"{filenamePrefix}{filenameSuffix}"), content);
return($"{filenamePrefix}{filenameSuffix}");
}
else
{
if (response.Result.StatusCode.Equals(System.Net.HttpStatusCode.NotFound))
{
return(null);
}
if (fileMetadataStr.Contains("ErrorInsufficientPermissionsInAccessToken"))
{
LogText.Text = "ClientId lacks permission to fetch: " + url;
return(null);
}
if (response.Result.StatusCode.Equals(System.Net.HttpStatusCode.Unauthorized))
{
token.refreshToken();
goto begin;
}
LogText.Text = $"Error statuscode: {response.Result.StatusCode} content: {response.Result.Content}" + Environment.NewLine
+ $"sleeping for {30*backOffMultiplier}sec..";
Thread.Sleep(backOffMultiplier * 30 * 1000);
backOffMultiplier *= 2;
goto begin;
}
return(null); // no picture found
}
catch (Exception ex)
{
LogText.Text = ex.ToString();
return(null); // probably no profile picture was found
}
}
/// <summary>
/// Perform an HTTP GET request to a URL using an HTTP Authorization header
/// </summary>
/// <param name="url">The URL</param>
/// <param name="token">The token</param>
/// <returns>String containing the results of the GET operation</returns>
public async Task <string> GetHttpContentWithToken(string url, TokenHolder token)
{
var httpClient = new System.Net.Http.HttpClient();
System.Net.Http.HttpResponseMessage response;
try
{
int backOffMultiplier = 1;
begin:
var request = new System.Net.Http.HttpRequestMessage(System.Net.Http.HttpMethod.Get, url);
//Add the token in Authorization header
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token.getToken());
response = await httpClient.SendAsync(request);
var content = await response.Content.ReadAsStringAsync();
if (response.IsSuccessStatusCode)
{
return(content);
}
else
{
if (response.StatusCode.Equals(System.Net.HttpStatusCode.NotFound))
{
// resource probably belongs to another tenant
return(content);
}
if (response.StatusCode.Equals(System.Net.HttpStatusCode.Forbidden))
{
// client id lacks permissions
LogText.Text = "ClientId lacks permission to fetch: " + url;
return(content);
}
if (response.StatusCode.Equals(System.Net.HttpStatusCode.Unauthorized))
{
LogText.Text = "Token expired?? Not authorized to fetch: " + url;
token.refreshToken();
goto begin;
}
else
{
LogText.Text = $"Error statuscode: {response.StatusCode} content: {response.Content}" + Environment.NewLine
+ $"sleeping for {30*backOffMultiplier}sec..";
Thread.Sleep(backOffMultiplier * 30 * 1000);
LogText.Text = "Continuing...";
backOffMultiplier *= 2;
goto begin;
}
}
}
catch (Exception ex)
{
LogText.Text = ex.ToString();
return(ex.ToString());
}
}