// <snippet508>
public async Task<LogOnResult> LogOnAsync(string userId, string password)
{
using (var handler = new HttpClientHandler { CookieContainer = new CookieContainer() })
{
using (var client = new HttpClient(handler))
{
client.AddCurrentCultureHeader();
// Ask the server for a password challenge string
var requestId = GenerateRequestId();
var response1 = await client.GetAsync(_clientBaseUrl + "GetPasswordChallenge?requestId=" + requestId);
response1.EnsureSuccessStatusCode();
var challengeEncoded = await response1.Content.ReadAsAsync<string>();
var challengeBuffer = CryptographicBuffer.DecodeFromHexString(challengeEncoded);
// Use HMAC_SHA512 hash to encode the challenge string using the password being authenticated as the key.
var provider = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha512);
var passwordBuffer = CryptographicBuffer.ConvertStringToBinary(password, BinaryStringEncoding.Utf8);
var hmacKey = provider.CreateKey(passwordBuffer);
var buffHmac = CryptographicEngine.Sign(hmacKey, challengeBuffer);
var hmacString = CryptographicBuffer.EncodeToHexString(buffHmac);
// Send the encoded challenge to the server for authentication (to avoid sending the password itself)
var response = await client.GetAsync(_clientBaseUrl + userId + "?requestID=" + requestId +"&passwordHash=" + hmacString);
// Raise exception if sign in failed
response.EnsureSuccessStatusCode();
// On success, return sign in results from the server response packet
var result = await response.Content.ReadAsAsync<UserInfo>();
var serverUri = new Uri(Constants.ServerAddress);
return new LogOnResult { ServerCookieHeader = handler.CookieContainer.GetCookieHeader(serverUri), UserInfo = result };
}
}
}
public async Task DeleteShoppingCartAsync(string shoppingCartId)
{
using (var shoppingCartClient = new HttpClient())
{
shoppingCartClient.AddCurrentCultureHeader();
var response = await shoppingCartClient.DeleteAsync(_shoppingCartBaseUrl + shoppingCartId);
response.EnsureSuccessStatusCode();
}
}
public async Task MergeShoppingCartsAsync(string oldShoppingCartId, string newShoppingCartId)
{
using (var shoppingCartClient = new HttpClient())
{
shoppingCartClient.AddCurrentCultureHeader();
string requestUrl = _shoppingCartBaseUrl + newShoppingCartId + "?oldShoppingCartId=" + oldShoppingCartId;
var response = await shoppingCartClient.PostAsync(requestUrl, null);
response.EnsureSuccessStatusCode();
}
}
public async Task RemoveShoppingCartItemAsync(string shoppingCartId, string itemIdToRemove)
{
using (var shoppingCartClient = new HttpClient())
{
shoppingCartClient.AddCurrentCultureHeader();
string requestUrl = _shoppingCartBaseUrl + shoppingCartId + "?itemIdToRemove=" + itemIdToRemove;
var response = await shoppingCartClient.PutAsync(requestUrl, null);
response.EnsureSuccessStatusCode();
}
}
public async Task RemoveProductFromShoppingCartAsync(string shoppingCartId, string productIdToDecrement)
{
using (var shoppingCartClient = new HttpClient())
{
shoppingCartClient.AddCurrentCultureHeader();
string requestUrl = _shoppingCartBaseUrl + shoppingCartId + "?productIdToDecrement=" + productIdToDecrement;
var response = await shoppingCartClient.PostAsync(requestUrl, null);
response.EnsureSuccessStatusCode();
}
}
public async Task<IReadOnlyCollection<string>> GetStatesAsync()
{
using (var client = new HttpClient())
{
client.AddCurrentCultureHeader();
var response = await client.GetAsync(_clientBaseUrl);
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<ReadOnlyCollection<string>>();
return result;
}
}
public async Task<ShoppingCart> GetShoppingCartAsync(string shoppingCartId)
{
using (var shoppingCartClient = new HttpClient())
{
shoppingCartClient.AddCurrentCultureHeader();
var response = await shoppingCartClient.GetAsync(_shoppingCartBaseUrl + shoppingCartId);
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<ShoppingCart>();
return result;
}
}
public async Task<Category> GetCategoryAsync(int categoryId)
{
using (var httpClient = new HttpClient())
{
httpClient.AddCurrentCultureHeader();
var response = await httpClient.GetAsync(_categoriesBaseUrl + categoryId.ToString());
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<Category>();
return result;
}
}
// </snippet513>
public async Task<ReadOnlyCollection<Category>> GetFilteredProductsAsync(string productsQueryString)
{
using (var httpClient = new HttpClient())
{
httpClient.AddCurrentCultureHeader();
var response = await httpClient.GetAsync(string.Format("{0}?productsQueryString={1}", _categoriesBaseUrl, productsQueryString));
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<ReadOnlyCollection<Category>>();
return result;
}
}
// <snippet513>
public async Task<ReadOnlyCollection<Category>> GetCategoriesAsync(int maxAmountOfProducts)
{
using (var httpClient = new HttpClient())
{
httpClient.AddCurrentCultureHeader();
var response = await httpClient.GetAsync(string.Format("{0}?maxAmountOfProducts={1}", _categoriesBaseUrl, maxAmountOfProducts));
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<ReadOnlyCollection<Category>>();
return result;
}
}
public async Task<ReadOnlyCollection<Product>> GetProductsAsync(int categoryId)
{
using (var httpClient = new HttpClient())
{
httpClient.AddCurrentCultureHeader();
var response =
await httpClient.GetAsync(string.Format("{0}?categoryId={1}", _productsBaseUrl, categoryId));
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<ReadOnlyCollection<Product>>();
return result;
}
}
// </snippet508>
public async Task<bool> VerifyActiveSessionAsync(string userId, string serverCookieHeader)
{
using (var handler = new HttpClientHandler { CookieContainer = new CookieContainer() })
{
using (var client = new HttpClient(handler))
{
client.AddCurrentCultureHeader();
var serverUri = new Uri(Constants.ServerAddress);
handler.CookieContainer.SetCookies(serverUri, serverCookieHeader);
var response = await client.GetAsync(_clientBaseUrl + "GetIsValidSession");
if (response.StatusCode == HttpStatusCode.Unauthorized)
throw new SecurityException();
response.EnsureSuccessStatusCode();
return await response.Content.ReadAsAsync<bool>();
}
}
}
public async Task ProcessOrderAsync(Order order, string serverCookieHeader)
{
using (HttpClientHandler handler = new HttpClientHandler { CookieContainer = new CookieContainer() })
{
using (var orderClient = new HttpClient(handler))
{
orderClient.AddCurrentCultureHeader();
Uri serverUri = new Uri(Constants.ServerAddress);
handler.CookieContainer.SetCookies(serverUri, serverCookieHeader);
orderClient.DefaultRequestHeaders.Add("Accept", "application/json");
string requestUrl = _clientBaseUrl + order.Id;
var response = await orderClient.PutAsJsonAsync<Order>(requestUrl, order);
await response.EnsureSuccessWithValidationSupportAsync();
}
}
}
public async Task<Product> GetProductAsync(string productNumber)
{
using (var httpClient = new HttpClient())
{
httpClient.AddCurrentCultureHeader();
var response = await httpClient.GetAsync(_productsBaseUrl + productNumber);
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsAsync<Product>();
return result;
}
}
