I am trying to modernize some calls to Moodle REST APIs.
Everything is doing OK as long as I use querystring, but I can't pinpoint why using a PutAsync doesn't work in this case (tested with Postman, it works):
using (var httpClient = _httpClientFactory.CreateClient())
{
var url = "http://127.0.0.1/moodle/webservice/rest/server.php";
var urlFunction = UrlFunction.core_user_create_users.ToString();
var urlFormat = UrlFormat.json.ToString();
var requestModel = new GetCoursesRequestModel()
{
wstoken = [token],
wsfunction = urlFunction,
moodlewsrestformat = urlFormat
};
var jsonRequest = JsonConvert.SerializeObject(requestModel);
var stringContentRequest = new StringContent(jsonRequest, Encoding.UTF8, "application/json");
var response = await httpClient.PutAsync(url, stringContentRequest);
response.EnsureSuccessStatusCode();
var courseDtos = await response.Content.ReadFromJsonAsync<List<MoodleAPIDtosCourseDto>>();
if (courseDtos is null)
throw new InputFormatterException(
$"Pb with response format.");
}
´´´´
The error is generated when I try to read my response at await response.Content.ReadFromJsonAsync()
Related
I was using OpenID and we have to switch to Xamarin.Essentials.WebAuthenticator.
I can get an authorization code from Okta using WebAuthenticator.AuthenticateAsync().
But, everything I try to then translate that code into an access token returns 400 Bad Request.
Okta's API error is "E0000021: HTTP media type not supported exception" and it goes on to say, "Bad request. Accept and/or Content-Type headers likely do not match supported values."
I have tried to follow https://developer.okta.com/blog/2020/07/31/xamarin-essentials-webauthenticator as much as possible, but we are not using the hybrid grant type like he is.
We are using only Authorization Code, which means I have to make a secondary call, and I have spent two days trying to figure out how.
private async Task LoginOktaAsync()
{
try
{
var loginUrl = new Uri(BuildAuthenticationUrl()); // that method is down below
var callbackUrl = new Uri("com.oktapreview.dev-999999:/callback"); // it's not really 999999
var authenticationResult = await Xamarin.Essentials.WebAuthenticator.AuthenticateAsync(loginUrl, callbackUrl);
string authCode;
authenticationResult.Properties.TryGetValue("code",out authCode);
// Everything works fine up to this point. I get the authorization code.
var url = $"https://dev-999999.oktapreview.com/oauth2/default/v1/token"
+"?grant_type=authorization_code"
+$"&code={authCode}&client_id={OktaConfiguration.ClientId}&code_verifier={codeVerifier}";
var request = new HttpRequestMessage(HttpMethod.Post, url);
var client = new HttpClient();
var response = await client.SendAsync(request); // this generates the 400 error.
}
catch(Exception e)
{
Debug.WriteLine($"Error: {e.Message}");
}
}
Here are the methods that produce the login url and a couple of other things:
public string BuildAuthenticationUrl()
{
var state = CreateCryptoGuid();
var nonce = CreateCryptoGuid();
CreateCodeChallenge();
var url = $"https://dev-999999.oktapreview.com/oauth2/default/v1/authorize?response_type=code"
+ "&response_mode=fragment"
+ "&scope=openid%20profile%20email"
+ "&redirect_uri=com.oktapreview.dev-999999:/callback"
+$"&client_id={OktaConfiguration.ClientId}"
+$"&state={state}"
+$"&code_challenge={codeChallenge}"
+ "&code_challenge_method=S256"
+$"&nonce={nonce}";
return url;
}
private string CreateCryptoGuid()
{
using (var generator = RandomNumberGenerator.Create())
{
var bytes = new byte[16];
generator.GetBytes(bytes);
return new Guid(bytes).ToString("N");
}
}
private string CreateCodeChallenge()
{
codeChallenge = GenerateCodeToVerify();
codeVerifier = codeChallenge;
using (var sha256 = SHA256.Create())
{
var codeChallengeBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(codeChallenge));
return Convert.ToBase64String(codeChallengeBytes);
}
}
private string GenerateCodeToVerify()
{
var str = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~";
Random rnd = new Random();
for (var i = 0; i < 100; i++)
{
str += possible.Substring(rnd.Next(0,possible.Length-1),1);
}
return str;
}
'''
After much online research, I discovered the issue was with how I was doing my post to get the token. This is how I made it work:
public static Dictionary<string, string> JsonDecode(string encodedString)
{
var inputs = new Dictionary<string, string>();
var json = JValue.Parse(encodedString) as JObject;
foreach (KeyValuePair<string, JToken> kv in json)
{
if (kv.Value is JValue v)
{
if (v.Type != JTokenType.String)
inputs[kv.Key] = v.ToString();
else
inputs[kv.Key] = (string)v;
}
}
return inputs;
}
private async Task<string> ExchangeAuthCodeForToken(string authCode)
{
string accessToken = string.Empty;
List<KeyValuePair<string, string>> kvdata = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("grant_type", "authorization_code"),
new KeyValuePair<string, string>("code", authCode),
new KeyValuePair<string, string>("redirect_uri", OktaConfiguration.Callback),
new KeyValuePair<string, string>("client_id", OktaConfiguration.ClientId),
new KeyValuePair<string, string>("code_verifier", codeVerifier)
};
var content = new FormUrlEncodedContent(kvdata);
var request = new HttpRequestMessage(HttpMethod.Post, OktaConfiguration.TokenUrl)
{Content = content, Method = HttpMethod.Post};
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.SendAsync(request);
string text = await response.Content.ReadAsStringAsync();
Dictionary<string, string> data = JsonDecode(text);
data.TryGetValue("access_token", out accessToken);
return accessToken;
}
Was trying to download an mp3 file in a browser through the API that I created. But instead of receiving an mp3 file. I keep getting JSON format response. I had referred from answer in return-file-in-asp-net-core-web-api, but still, I can't download the mp3 file.
Is there any mistake that I've overlooked, please kindly help?
This is my downloading method from UI
void DownloadRecording(RecordingHistory voicehistory)
{
try
{
using (var client = new WebClient())
{
client.DownloadFile("https://2d489fd863a2.ngrok.io/api/download/" + voicehistory.RecordingId + ".mp3", voicehistory.RecordingId + ".mp3");
}
}
catch { }
}
This is my api function for downloading mp3 from server
[HttpGet("download/{recordingFile}")]
public async Task<IActionResult> DownloadVoiceRecording(string recordingFile)
{
string filePath = Directory.GetCurrentDirectory() + #"\audio\Processed\" + recordingFile;
var memory = new MemoryStream();
using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
var types = GetMimeTypes();
var ext = Path.GetExtension(filePath).ToLowerInvariant();
return File(filePath, types[ext], recordingFile);
}
private Dictionary<string, string> GetMimeTypes()
{
return new Dictionary<string, string>
{
{".mp3", "audio/mpeg"},
{".wav","audio/wav" }
};
}
This is the response I get from browser and Postman
{
"Version": "2.0.0.0",
"StatusCode": 200,
"Message": "Status 200 OK",
"Result":"��#� ... ... /// A lot of random symbol here
}
Because the first parameter of the return value File is a type of Stream, memory needs to be passed in.
[HttpGet("download/{recordingFile}")]
public async Task<IActionResult> DownloadVoiceRecording(string recordingFile)
{
string filePath = Directory.GetCurrentDirectory() + #"\audio\Processed\" + recordingFile;
var memory = new MemoryStream();
using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
var types = GetMimeTypes();
var ext = Path.GetExtension(filePath).ToLowerInvariant();
return File(memory, types[ext], recordingFile);
}
I'm using Blazor for this. It turns out that there was an API response wrapper in Blazor APIReponse middleware. I had to put my API into an exception so it won't turn into JSON when I access it. It works finally.
Below is the APIReponse wrapper in Blazor.
var formattedRequest = await FormatRequest(request);
var originalBodyStream = httpContext.Response.Body;
using (var responseBody = new MemoryStream())
{
try
{
string responseBodyContent = null;
var response = httpContext.Response;
if (new string[] { "/api/localization", "/api/data", "/api/externalauth", "/api/download" }.Any(e => request.Path.StartsWithSegments(new PathString(e.ToLower()))))
await _next.Invoke(httpContext);
else
{
response.Body = responseBody;
await _next.Invoke(httpContext);
//wrap response in ApiResponse
if (httpContext.Response.StatusCode == Status200OK)
{
responseBodyContent = await FormatResponse(response);
await HandleSuccessRequestAsync(httpContext, responseBodyContent, Status200OK);
}
else
await HandleNotSuccessRequestAsync(httpContext, httpContext.Response.StatusCode);
}
I need to be able to access the id of a new Post. I will be using this id to populate another field called LocationId like this: "L" + id = LocationId (example L22) where 22 is the id of the new Post. Here is the code for my Post request:
private async void BtnSubmit_Clicked(object sender, EventArgs e)
{
var imageArray = FilesHelper.ReadFully(file.GetStream());
file.Dispose();
var location = new Models.Location()
{
LocationName = EntName.Text,
ImageArray = imageArray,
};
ApiServices apiServices = new ApiServices();
bool response = await apiServices.PostLocation(location);
bool response2 = await apiServices.InputLocationId(id, location);
if (!response || !response2)
{
await DisplayAlert("Alert", "Something wrong", "Cancel");
}
else
{
await DisplayAlert("Hi", "Your record has beed added successfully", "Alright");
}
await Navigation.PushAsync(new SetupPage());
This is on the client side. I have all the APIs created (such as PostLocation and InputLocationId)on Azure SQL Server. This is for a mobile inventory app built using Xamarin.
public async Task<bool> PostLocation(Location location)
{
var json = JsonConvert.SerializeObject(location);
var httpClient = new HttpClient();
var content = new StringContent(json, Encoding.UTF8, "application/json");
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", Settings.AccessToken);
var wimsApiUrl = "http://xxxxxxx.azurewebsites.net/api/Locations";
//Get the Body of the Post
var body = await httpClient.PostAsync(wimsApiUrl, content);
//Convert it to a string
var jString = await body.Content.ReadAsStringAsync();
//Place it in a JSON Object
JObject joResponse = JObject.Parse(jString);
//Parse the JSON Object into an Int from a String
var id = int.Parse(joResponse["Id"].ToString());
//This is used in my other script to Put the LocationId of Lxx
AddNewLocationPage.NewLocationId = id;
return body.IsSuccessStatusCode;
}
My Post Location API:
// POST: api/Locations
[ResponseType(typeof(Location))]
public IHttpActionResult PostLocation([FromBody] Location location)
{
string userId = User.Identity.GetUserId();
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
var stream = new MemoryStream(location.ImageArray);
var guid = Guid.NewGuid().ToString();
var file = String.Format("{0}.jpg", guid);
var folder = "~/Content/Images";
var fullPath = String.Format("{0}/{1}", folder, file);
var response = FilesHelper.UploadPhoto(stream, folder, file);
if (response)
{
location.ImagePath = fullPath;
}
var newLocation = new Location()
{
LocationName = location.LocationName,
User = userId,
ImagePath = location.ImagePath
};
db.Locations.Add(newLocation);
db.SaveChanges();
return Ok(new { newLocation.Id});
}
I will then take the id and put it in this Put Request to create the LocationId:
public async Task<bool> InputLocationId(int id, Location location)
{
var json = JsonConvert.SerializeObject(location);
var httpClient = new HttpClient();
var content = new StringContent(json, Encoding.UTF8, "application/json");
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", Settings.AccessToken);
var wimsApiUrl = "http://xxxxxxx.azurewebsites.net/api/Locations/InputLocationId/";
var completeUrl = String.Format("{0}{1}", wimsApiUrl, id);
var response = await httpClient.PutAsync(completeUrl, content);
return response.IsSuccessStatusCode;
}
The InputLocationId API will automatically create the LocationId. Here is my API:
// PUT: api/Locations/5
[HttpPut]
[ResponseType(typeof(void))]
[Route("api/Locations/InputLocationId/{id}")]
public IHttpActionResult InputLocationId(int id, [FromBody] Location location)
{
//string userId = User.Identity.GetUserId();
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
var result = db.Locations.FirstOrDefault(locationId => locationId.Id == id);
var resultant = String.Format("L{0}", id);
location.LocationName = location.LocationName;
result.LocationId = resultant;
db.SaveChanges();
return Ok("The record has been updated");
}
I am simply stuck on how to access that id!
// get the response body
var body = await httpClient.PostAsync(wimsApiUrl, content);
// load it into a JSON object using Newtonsoft
JObject data = JObject.Parse(body);
// get the id
var id = int.Parse(data["id"]);
The returns need to be converted into a string from the HttpResponseMessage.
var body = await httpClient.PostAsync(wimsApiUrl, content);
var jString = await body.Content.ReadAsStringAsync();
Then we can place it into a JSON Object:
JObject joResponse = JObject.Parse(jString);
Now this JSON Object can be parsed into an Int. Note it needs to be converted to a string.
var id = int.Parse(joResponse["Id"].ToString());
not sure if I am doing this right , passing a Token value and then get some info from a webservice.
I edited this question , it is passing authentication. I will leave it for future searches.
private async void Data(string AUTH)
{
using (HttpClient client = new HttpClient())
{
var Tokens = Storage.access.AUTH;
var json = JsonConvert.SerializeObject(AUTH);
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", AUTH);
client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json");
var response = client.GetAsync("https://any adrees.com").Result;
string content = response.Content.ReadAsStringAsync().Result;
if (response.IsSuccessStatusCode)
{
var content2 = await response.Content.ReadAsStringAsync();
var Items = JsonConvert.DeserializeObject<Mensajes>(content2);
}
Debug.WriteLine(content);
}
}
Not sure what type of token you are refer to, my answer will be based on OAuth access token.
You will need to create a AuthenticationHeaderValue and set it into HttpClient's headers.
var authHeader = new AuthenticationHeaderValue("bearer", Storage.accessToken.Token);
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization = authHeader;
I'm trying to clear all azure storage queue message via Queue Service REST API. I've verified that the code is correct, but it still returns a 403 forbidden error. The "StorageSharedKey" and "StorageAccountName" are correct since I'm able to connect to the azure queue using those values in the connection string for the azure queue client. The storage version I'm using is "2015-12-11".
Here is the code:
internal void ClearStorageQueueMessages(string queueName)
{
const string requestMethod = "DELETE";
string urlPath = $"{queueName}/messages";
var dateInRfc1123Format = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
var canonicalizedHeaders = $"x-ms-date:{dateInRfc1123Format}\nx-ms-version:{StorageVersion}";
var canonicalizedResource = $"/{StorageAccountName}/{urlPath}";
var uri = new Uri($"https://{StorageAccountName}.queue.core.windows.net/{urlPath}");
var response = MakeDeleteRestCall(uri, requestMethod, dateInRfc1123Format, canonicalizedHeaders, canonicalizedResource);
}
internal RestResponse MakeDeleteRestCall(Uri uri, string requestMethod, string dateInRfc1123Format, string canonicalizedHeaders,
string canonicalizedResource)
{
var restResponse = new RestResponse();
var stringToSign = $"{requestMethod}\n\n\n\n\n\n\n\n\n\n\n\n{canonicalizedHeaders}\n{canonicalizedResource}";
var authorizationHeader = CreateAuthorizationHeader(stringToSign);
var request = (HttpWebRequest) WebRequest.Create(uri);
request.Method = requestMethod;
request.Headers.Add("x-ms-date", dateInRfc1123Format);
request.Headers.Add("x-ms-version", StorageVersion);
request.Headers.Add("Authorization", authorizationHeader);
//request.Accept = "application/atom+xml,application/xml";
request.Accept = "application/json";
//request.ContentType = "application/json";
using (var response = (HttpWebResponse) request.GetResponse())
{
restResponse.StatusCode = response.StatusCode;
var responseStream = response.GetResponseStream();
if (responseStream == null)
return restResponse;
using (var reader = new StreamReader(responseStream))
{
restResponse.ReturnedContent = reader.ReadToEnd();
}
}
return restResponse;
}
internal static string CreateAuthorizationHeader(string canonicalizedString)
{
string signature;
using (var hmacSha256 = new HMACSHA256(Convert.FromBase64String(StorageSharedKey)))
{
var dataToHmac = Encoding.UTF8.GetBytes(canonicalizedString);
signature = Convert.ToBase64String(hmacSha256.ComputeHash(dataToHmac));
}
var authorizationHeader = string.Format(CultureInfo.InvariantCulture, "{0} {1}:{2}", StorageSharedKey,
StorageAccountName, signature);
return authorizationHeader;
}
The problem seems to be with the header Authorization. Please check the format according to the documentation:
Authorization="[SharedKey|SharedKeyLite] :"
https://msdn.microsoft.com/en-us/library/azure/dd179428.aspx
Your function adds the shared key in plain text instead of the authorization scheme "SharedKey" or "SharedKeyLite".