public async Task<Session> Login (LoginOptions options, string [] scope, CancellationToken token)
{
List<AccountProvider> providers = GetProviderChain (options, scope).ToList ();
options.TryReportProgress (LoginProgress.Authorizing);
var providerExceptions = new List<Exception> ();
// Try each provider in turn
foreach (var pi in providers.Select ((p, i) => new { Provider = p, Index = i })) {
bool isLast = (pi.Index == providers.Count - 1);
AccountProvider provider = pi.Provider;
token.ThrowIfCancellationRequested ();
try {
return await GetSession (provider, isLast, options, token);
} catch (TaskCanceledException) {
throw;
} catch (Exception ex) {
providerExceptions.Add (ex);
}
}
// Neither provider worked
throw new AggregateException ("Could not obtain session via either provider.", providerExceptions);
}
public async Task <Session> Login(LoginOptions options, string [] scope, CancellationToken token)
{
List <AccountProvider> providers = GetProviderChain(options, scope).ToList();
options.TryReportProgress(LoginProgress.Authorizing);
var providerExceptions = new List <Exception> ();
// Try each provider in turn
foreach (var pi in providers.Select((p, i) => new { Provider = p, Index = i }))
{
bool isLast = (pi.Index == providers.Count - 1);
AccountProvider provider = pi.Provider;
token.ThrowIfCancellationRequested();
try {
return(await GetSession(provider, isLast, options, token));
} catch (TaskCanceledException) {
throw;
} catch (Exception ex) {
providerExceptions.Add(ex);
}
}
// Neither provider worked
throw new AggregateException("Could not obtain session via either provider.", providerExceptions);
}
async Task <Account> GetAccount(AccountProvider provider, bool allowFallback, LoginOptions options)
{
List <Account> accounts;
options.TryReportProgress(provider.ProgressWhileAuthenticating);
try {
// Now, let's get accounts for current provider.
// For different services and login methods, this may launch Safari, show iOS 6 prompt or just query ACAccounts.
accounts = (await provider.GetAccounts()).ToList();
} finally {
options.TryReportProgress(LoginProgress.Authorizing);
}
if (accounts.Count == 0)
{
throw new InvalidOperationException("No accounts found for this service.");
}
if (accounts.Count == 1)
{
return(accounts [0]);
}
// If there is more than a single account, present an interface to choose one.
// If fallback is available, add it to the list of options with null value.
var choiceUI = options.AccountChoiceProvider;
if (choiceUI == null)
{
throw new InvalidOperationException("There is more than one account, but no accountChoiceProvider was specified.");
}
// Add "Other" option that falls back to next provider
if (allowFallback)
{
accounts.Add(null);
}
// Show chooser interface
options.TryReportProgress(LoginProgress.PresentingAccountChoice);
try {
return(await choiceUI.ChooseAsync(accounts, a => (a != null)?a.Username : "******"));
} finally {
options.TryReportProgress(LoginProgress.Authorizing);
}
}
async Task<Account> GetAccount (AccountProvider provider, bool allowFallback, LoginOptions options)
{
List<Account> accounts;
options.TryReportProgress (provider.ProgressWhileAuthenticating);
try {
// Now, let's get accounts for current provider.
// For different services and login methods, this may launch Safari, show iOS 6 prompt or just query ACAccounts.
accounts = (await provider.GetAccounts ()).ToList ();
} finally {
options.TryReportProgress (LoginProgress.Authorizing);
}
if (accounts.Count == 0)
throw new InvalidOperationException ("No accounts found for this service.");
if (accounts.Count == 1)
return accounts [0];
// If there is more than a single account, present an interface to choose one.
// If fallback is available, add it to the list of options with null value.
var choiceUI = options.AccountChoiceProvider;
if (choiceUI == null)
throw new InvalidOperationException ("There is more than one account, but no accountChoiceProvider was specified.");
// Add "Other" option that falls back to next provider
if (allowFallback)
accounts.Add (null);
// Show chooser interface
options.TryReportProgress (LoginProgress.PresentingAccountChoice);
try {
return await choiceUI.ChooseAsync (accounts, a => (a != null) ? a.Username : "******");
} finally {
options.TryReportProgress (LoginProgress.Authorizing);
}
}
