private static async Task<Response<string>> GetResponseAsync(string relativeUriFormat, User user)
{
Response<string> response;
try
{
string dob = user.DateOfBirth.ToString("ddMMyyyy", System.Globalization.CultureInfo.InvariantCulture);
var postContent = new HttpFormUrlEncodedContent(
new KeyValuePair<string, string>[3] {
new KeyValuePair<string, string>("regno", user.RegNo),
new KeyValuePair<string, string>("dob", dob),
new KeyValuePair<string, string>("mobile", user.PhoneNo)
});
string uriString = BASE_URI_STRING + String.Format(relativeUriFormat, user.Campus);
HttpResponseMessage httpResponse = await _httpClient.PostAsync(new Uri(uriString), postContent);
response = await GetRootResponseAsync(httpResponse);
}
catch
{
response = new Response<string>(StatusCode.NoInternet, null);
}
return response.Format();
}
internal static async Task CreateNewCalendarAsync(User requester)
{
await DeleteCalendarAsync();
AppointmentCalendar calendar = await _store.CreateAppointmentCalendarAsync("Academics Calendar");
calendar.OtherAppReadAccess = AppointmentCalendarOtherAppReadAccess.SystemOnly;
calendar.OtherAppWriteAccess = AppointmentCalendarOtherAppWriteAccess.None;
await calendar.SaveAsync();
_calendar = calendar;
CalendarOwner = requester.RegNo;
}
public static async Task<Response<string>> TryGetAdvisorDetailsAsync(User user)
{
return await GetContentAsync(ADVISOR_STRING_FORMAT, user);
}
///<summary>
/// Get the academic history as a Json string along with status code for the specified user by sending a Http request.
/// </summary>
/// <param name="user">
/// The user whose data to request.
/// </param>
/// <remarks>
/// Note: This method attempts a login and a single retry upon receiving a SessionTimedOut error.
/// </remarks>
/// <returns>
/// A response containing status code and content. Returns the Json string as the content on success, otherwise the content is null.
/// </returns>
public static async Task<Response<string>> TryGetGradesAsync(User user)
{
return await GetContentAsync(GRADES_STRING_FORMAT, user);
}
/// <summary>
/// Get the data as a Json string along with status code for the specified user by sending a Http request.
/// </summary>
/// <param name="user">
/// The user whose data to request.
/// </param>
/// <remarks>
/// Note: This method attempts a login and a single retry upon receiving a SessionTimedOut error.
/// </remarks>
/// <returns>
/// A response containing status code and content. Returns the Json string as the content on success, otherwise the content is null.
/// </returns>
public static async Task<Response<string>> TryGetDataAsync(User user)
{
return await GetContentAsync(REFRESH_STRING_FORMAT, user);
}
/// <summary>
/// Attempts to login the passed user and returns the status of the operation.
/// </summary>
/// <remarks>
/// Note: On encountering an internal error, another attempt is made to login before the method returns.
/// </remarks>
/// <param name="user">
/// The user to login.
/// </param>
/// <returns>
/// Status code indicating result of the login attempt.
/// </returns>
public static async Task<StatusCode> TryLoginAsync(User user)
{
StatusCode statusCode = StatusCode.UnknownError;
int i = 1;
while (i++ <= MAX_ATTEMPTS)
{
statusCode = (await GetResponseAsync(LOGIN_STRING_FORMAT, user)).Code;
if (statusCode == StatusCode.TemporaryError // If Error parsing the captcha (or)
|| statusCode == StatusCode.InvalidCredentials) // If the captcha was parsed incorrectly
continue; // Then attempt to login again
else
break;
}
return statusCode;
}
/// <summary>
/// Returns the content and status of the specified network request. Content is null if request fails.
/// </summary>
/// <param name="relUriFormat">
/// The (relative) uri format string into which user parameters will be introduced.
/// </param>
/// <param name="user"></param>
/// <returns></returns>
private static async Task<Response<string>> GetContentAsync(string relUriFormat, User user)
{
Response<string> response = await GetResponseAsync(relUriFormat, user);
if (response.Code == StatusCode.SessionTimeout)
{
StatusCode loginStatus = await TryLoginAsync(user);
if (loginStatus == StatusCode.Success)
response = await GetResponseAsync(relUriFormat, user);
else
response = new Response<string>(loginStatus, null);
}
return response;
}
/// <summary>
/// Resets calendar, clears cache and resets the new semester flag, to enable a direct refresh to new data. Other settings and credentials are retained.
/// </summary>
/// <returns>
/// A status code if reset was successful, otherwise an error code.
/// </returns>
public static async Task<StatusCode> RunMaintentanceForUpgradeAsync()
{
return await MonitoredTask(async () =>
{
if (CurrentUser == null)
return StatusCode.InvalidRequest;
PropertyChanged = null;
CurrentUser = new User(CurrentUser.RegNo, CurrentUser.DateOfBirth, CurrentUser.Campus, CurrentUser.PhoneNo);
try
{
#if WINDOWS_PHONE_APP
await CalendarManager.CreateNewCalendarAsync(CurrentUser);
#endif
StorageFile dataFile = await _roamingFolder.GetFileAsync(DATA_JSON_FILE_NAME);
await dataFile.DeleteAsync();
}
catch (FileNotFoundException)
{ ; }
catch (Exception)
{
return StatusCode.UnknownError;
}
AppSettings.IsSemesterUpgradeAvailable = false;
return StatusCode.Success;
});
}
/// <summary>
/// Assigns the current user (and logs in) and saves the credentials to the Locker, if a login with the passed parameters was successful.
/// </summary>
/// <remarks>
/// Note: Any existing credentials in the Locker are overwritten on success.
/// </remarks>
/// <returns>
/// Returns a specific status code as per the login attempt result.
/// </returns>
public static async Task<StatusCode> CreateNewUserAsync(string regNo, DateTimeOffset dateOfBirth, string campus, string phoneNo)
{
return await MonitoredTask(async () =>
{
User user = new User(regNo, dateOfBirth, campus, phoneNo);
StatusCode status = await NetworkService.TryLoginAsync(user);
if (status == StatusCode.Success)
{
try
{
if(CurrentUser != null)
{
#if WINDOWS_PHONE_APP
await DeleteSavedUserAsync();
#else
DeleteSavedUser();
#endif
}
PasswordCredential credential = GetStoredCredential();
if (credential != null)
new PasswordVault().Remove(credential);
// Store Credentials in the following format: "VITacademics" - "{regNo}" : "{ddMMyyyy}_{campus}_{phoneNo}"
new PasswordVault().Add(
new PasswordCredential(RESOURCE_NAME, regNo,
string.Format("{0}_{1}_{2}", dateOfBirth.ToString("ddMMyyyy", CultureInfo.InvariantCulture), campus, phoneNo)));
CurrentUser = user;
#if WINDOWS_PHONE_APP
await CalendarManager.CreateNewCalendarAsync(CurrentUser);
#endif
}
catch
{
status = StatusCode.UnknownError;
}
}
return status;
}
);
}
/// <summary>
/// Checks the Credential Locker and assigns current user if available.
/// </summary>
static UserManager()
{
PasswordCredential credential = GetStoredCredential();
if (credential != null)
{
try
{
credential = new PasswordVault().Retrieve(RESOURCE_NAME, credential.UserName);
// Parse "password" to retrieve DOB, campus and phoneNo
string[] values = credential.Password.Split('_');
DateTimeOffset dob = DateTimeOffset.ParseExact(values[0], "ddMMyyyy", CultureInfo.InvariantCulture);
string campus = values[1];
string phoneNo = values[2];
CurrentUser = new User(credential.UserName, dob, campus, phoneNo);
}
catch
{
// Corrupt data
#if WINDOWS_PHONE_APP
DeleteSavedUserAsync();
#else
DeleteSavedUser();
#endif
}
}
else
CurrentUser = null;
}
