// GET: /account/paypal-payment
public ActionResult PaypalPayment(string tx = null)
{
PayPalPaymentResult result = PayPalPaymentResult.Canceled;
var helper = new PayPalHelper();
var txnId = !String.IsNullOrEmpty(tx)
// tx in PDT from Sandbox is upper-case on automatic return and lower-case on manual return. A PDT request returns error 4002 if given a low-case tx.
? tx.ToUpper()
: "PDT " + KeyUtils.GetCurrentTimeKey();
helper.WriteLog(PayPalLogEntity.NotificationKind.PDT, txnId, Request.Url.Query);
if (!String.IsNullOrEmpty(tx))
{
// Query PayPal.
var response = helper.RequestPaymentDetails(txnId);
var logRowKey = helper.WriteLog(PayPalLogEntity.NotificationKind.DetailsRequest, txnId, response);
// Parse the response
var lines = helper.SplitPdtMessage(response);
var payment = helper.ParsePaymentLines(lines);
// Write the payment to the database.
if (helper.PostIncomingPayPalPayment(payment, logRowKey))
{
result = PayPalPaymentResult.Success;
}
}
return(RedirectToAction("Transactions", new { PayPalPaymentResult = result }));
}
public async Task <IHttpActionResult> PostResourceView([FromUri] int id, [FromBody] JObject value)
{
// A suggestion may have resourceId == null(0?) when the resource is made on the client in code and points to Google
// TODO. Idea: Get the unauthenicated user's session cookie and log views for the session in a separate datastore.
var userId = this.GetUserId(); // GetUserId() returns 0 for an unauthenticated user. That's fine. We log every view.
var logEnity = new DynamicTableEntity(KeyUtils.GetCurrentTimeKey(), KeyUtils.IntToKey(userId));
logEnity["Json"] = new EntityProperty(value.ToString());
var logTask = AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.LibraryLog, logEnity);
if (userId != 0 && id != 0)
{
var viewTask = DapperHelper.ExecuteResilientlyAsync("dbo.libPostResourceView",
new
{
UserId = userId,
ResourceId = id,
},
CommandType.StoredProcedure);
// We use KeyUtils.LocalTimeToInvertedKey() to keep the local time and to order last records first for retrieval.
var localTime = (string)value["localTime"];
var rowKey = KeyUtils.LocalTimeToInvertedKey(localTime);
if (String.IsNullOrEmpty(rowKey))
{
throw new ArgumentOutOfRangeException(localTime);
}
var historyEntity = new LibraryHistoryEntity
{
PartitionKey = KeyUtils.IntToKey(userId),
RowKey = rowKey,
ResourceId = id,
};
var historyTask = AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.LibraryHistory, historyEntity);
// Do all the tasks in parallel.
await Task.WhenAll(viewTask, historyTask, logTask);
}
else
{
await logTask;
}
return(StatusCode(HttpStatusCode.NoContent));
}
public async Task <IHttpActionResult> InboundWebhook(InboundWebhookFormModel form)
{
// The form is empty on a HEAD request
if (form != null)
{
var mandrill_events = form.mandrill_events;
var partitionKey = KeyUtils.GetCurrentTimeKey();
var entity = new ExternalSessionLogEntity
{
PartitionKey = partitionKey,
RowKey = "InboundWebhook",
Data = mandrill_events,
};
await AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.ExternalSessions, entity);
await SendSmsMessage("InboundWebhook " + partitionKey, partitionKey);
}
return(StatusCode(HttpStatusCode.NoContent));
}
public string WriteLog(PayPalLogEntity.NotificationKind kind, string txnId, string logData)
{
if (String.IsNullOrEmpty(txnId))
{
throw new ArgumentException();
}
var rowKey = KeyUtils.GetCurrentTimeKey();
var entity = new PayPalLogEntity
{
PartitionKey = txnId,
RowKey = rowKey,
Kind = kind.ToString(),
LogData = logData,
};
AzureStorageUtils.InsertEntity(AzureStorageUtils.TableNames.PaymentLog, entity);
return(rowKey);
}
// Extract text from the HTML page
private string FindText(string html, string startSnippet, string endSnippet)
{
var i1 = html.IndexOf(startSnippet);
var i2 = html.IndexOf(endSnippet, i1 + 1);
if ((i1 == -1) || (i2 == -1))
{
// Write the poison HTML page to the log.
var partitionKey = KeyUtils.GetCurrentTimeKey();
var entity = new ExternalSessionLogEntity
{
PartitionKey = partitionKey,
RowKey = "Error_FindText",
Data = html,
};
AzureStorageUtils.InsertEntity(AzureStorageUtils.TableNames.ExternalSessions, entity);
throw new FormatException("Parsing the external service data. Snippet not found. " + startSnippet.Length.ToString() + " " + endSnippet.Length.ToString());
}
var shift = startSnippet.Length;
return(html.Substring(i1 + shift, i2 - i1 - shift));
}
public async Task <IHttpActionResult> PostBooking([FromBody] JObject json)
{
TimeUtils.ThrowIfClientTimeIsAmbiguous((string)json["localTime"], (int)json["localTimezoneOffset"]);
var teacherUserId = (int)json["teacherUserId"];
var start = (DateTime)json["start"];
var end = (DateTime)json["end"];
var price = (decimal)json["price"];
var userId = this.GetUserId();
var teacher = SessionHelper.ItalkiTeachers.First(i => i.UserId == teacherUserId);
var periods = await SessionHelper.GetTeacherPeriods(teacherUserId, true);
var available = periods.Any(i => (i.Start <= start) && (i.End >= end));
if (!available)
{
throw new Exception(ItalkiHelper.TimeSlotUnavailableError);
}
/* Compensation is the mechanism by which previously completed work can be undone or compensated when a subsequent failure occurs.
* The Compensation pattern is required in error situations when multiple atomic operations cannot be linked with classic transactions.
*/
// We cannot use a transaction in a heterogeneous storage mediums. An orphaned message on Azure Table is not a problem, we do not compensate it on error. The main message metadata is in the database anyway.
var message = (string)json["message"];
var messageExtId = await SessionHelper.SaveMessageAndGetExtId(message);
var sessionId = (await DapperHelper.QueryResilientlyAsync <int>("dbo.sesBookSession", new
{
UserId = userId, // who requests and pays
Start = start,
End = end,
TeacherUserId = teacherUserId,
Price = price,
MessageExtId = messageExtId,
},
CommandType.StoredProcedure))
.Single();
// We will write to the log.
var partitionKey = KeyUtils.GetCurrentTimeKey();
// Book the session on Italki.
try
{
long?sessionExtId = null;
#if DEBUG
sessionExtId = 0;
#else
var helper = new ItalkiHelper();
sessionExtId = await helper.BookSession(teacher.CourseId, start, teacher.ScheduleUrl, partitionKey);
#endif
if (sessionExtId.HasValue)
{
await DapperHelper.ExecuteResilientlyAsync("dbo.sesUpdateSessionExtId", new
{
SessionId = sessionId,
ExtId = sessionExtId,
},
CommandType.StoredProcedure);
}
}
catch (Exception ex)
{
// Compensation on booking failure.
// Clean up the session.
DapperHelper.ExecuteResiliently("dbo.sesCancelSession", new
{
UserId = userId,
SessionId = sessionId,
ClearUsers = true,
},
CommandType.StoredProcedure);
throw new UserAlertException("Failed to book session", ex);
}
HostingEnvironment.QueueBackgroundWorkItem(async(ct) => await SendSmsMessage("Session request. Teacher " + teacherUserId.ToString(), partitionKey));
return(StatusCode(HttpStatusCode.NoContent));
}
public ActionResult PaypalIpn()
{
var content = Request.BinaryRead(Request.ContentLength);
var message = Encoding.ASCII.GetString(content);
var helper = new PayPalHelper();
var lines = helper.SplitIpnMessage(message);
var payment = helper.ParsePaymentLines(lines);
var txnId = !String.IsNullOrEmpty(payment.TxnId) ? payment.TxnId : "IPN " + KeyUtils.GetCurrentTimeKey();
var logRowKey = helper.WriteLog(PayPalLogEntity.NotificationKind.IPN, txnId, message);
var response = helper.VerifyIPN(message, txnId);
helper.WriteLog(PayPalLogEntity.NotificationKind.IPNResponse, txnId, response);
if (response == "VERIFIED")
{
if (helper.PostIncomingPayPalPayment(payment, logRowKey))
{
//helper.PurchaseOnIncomingPayPalPayment(payment);
}
}
return(new HttpStatusCodeResult(HttpStatusCode.NoContent));
}
public async Task <long?> BookSession(int courseId, DateTime start, string referer, string tablePartitionKey)
{
// Time slot is encoded in a weired way.
var origin = DateTime.UtcNow.Date;
var diff = start - origin;
var day = Convert.ToInt32(Math.Floor(diff.TotalDays)) - 1; // Day number for the next day is 0.
if (day < 0)
{
throw new Exception(ItalkiHelper.TimeSlotUnavailableError);
}
var halfHour = (diff.Hours * 2) + (diff.Minutes == 30 ? 1 : 0); // Convert.ToInt32(1.0 * diff.Minutes / 30); // We expect minutes to be either 00 or 30.
var timeText = String.Format("{0},{1}", day, halfHour);
// We will write to the log.
var partitionKey0 = KeyUtils.GetCurrentTimeKey();
// Pre-booking validation. It might be redundand. We may want to do it just in case.
// Note that the validation call does not send the courseId. That means the server uses a session(???) or a cookie or the Referer header. It may cause problems in a multi-teacher scenario, until we use a separate HttpClient for each teacher.
//var content1 = new FormUrlEncodedContent(new[]
//{
// new KeyValuePair<string, string>("MethodName", "ValidSessionTime"),
// new KeyValuePair<string, string>("time", timeText),
//});
//var request1 = new HttpRequestMessage
//{
// RequestUri = new Uri(ItalkiWebServicesUrl),
// Method = HttpMethod.Post,
// Content = content1,
//};
//request1.Headers.Add("Referer", referer);
//var response1 = await httpClient.SendAsync(request1);
//var statusCode1 = (int)response1.StatusCode;
//string responseContent1 = null;
//if (response1.IsSuccessStatusCode)
//{
// responseContent1 = await response1.Content.ReadAsStringAsync();
//}
//var entity1 = new ExternalSessionLogEntity
//{
// PartitionKey = partitionKey,
// RowKey = "ValidationResponse",
// Data = responseContent1,
// HttpStatus = statusCode1,
//};
//await AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.ExternalSessions, entity1);
//response1.EnsureSuccessStatusCode();
// Send the booking request
#if DEBUG
var password = "******";
#else
var password = ConfigurationManager.AppSettings["Italki.Password1"];
#endif
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair <string, string>("MethodName", "RequestSession"),
new KeyValuePair <string, string>("time", timeText), // It will be Url-encoded by the form oject.
new KeyValuePair <string, string>("tool", "1"),
new KeyValuePair <string, string>("sim", "andrey.fomin3"),
new KeyValuePair <string, string>("msg", ":)"), // ":-) :) :D :o) :] :3 :c) :> =] 8) =) :} :^)"
new KeyValuePair <string, string>("pwd", password),
new KeyValuePair <string, string>("cid", courseId.ToString()),
});
var request = new HttpRequestMessage
{
RequestUri = new Uri(ItalkiWebServicesUrl),
Method = HttpMethod.Post,
Content = content,
};
request.Headers.Add("Referer", referer);
// Write to the log
var entity = new ExternalSessionLogEntity
{
PartitionKey = tablePartitionKey,
RowKey = "ItalkiRequest",
Data = JsonUtils.SerializeAsJson(new
{
CourseId = courseId,
Start = start,
Time = timeText,
}),
};
await AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.ExternalSessions, entity);
// Book the session with Italki
var response = await httpClient.SendAsync(request);
var statusCode = (int)response.StatusCode;
string responseContent = null;
if (response.IsSuccessStatusCode)
{
responseContent = await response.Content.ReadAsStringAsync();
}
// Write the response to the log
entity = new ExternalSessionLogEntity
{
PartitionKey = tablePartitionKey,
RowKey = "ItalkiResponse",
Data = responseContent,
HttpStatus = statusCode,
};
await AzureStorageUtils.InsertEntityAsync(AzureStorageUtils.TableNames.ExternalSessions, entity);
response.EnsureSuccessStatusCode();
long?extSessionId = null;
try
{
var items = JArray.Parse(responseContent);
/* +https://secure.italki.com/sessions/schedule_20131106.js?v=150302 , Line 853
* if(result[0]=="-2") $get("MsgPrompt").innerHTML=TS312;
* if(result[0]=="-1") $get("MsgPrompt").innerHTML=TS313;
* if(result[0]=="1") $get("MsgPrompt").innerHTML=TS314;
* if(result[0]=="-3") $get("MsgPrompt").innerHTML=TS315;
* In HTML
* var TS312="The time you\'re scheduling was taken by other students. Please try other time.";
* var TS313="Your payment account balance is not enough to pay for the session(s) you are scheduling.";
* var TS314="Trial session is not available.";
* var TS315="Incorrect password";
*/
var result = (string)items.FirstOrDefault();
if ((result == "Y") || (result == "Y1"))
{
var idArr = items[3];
if (idArr is JArray)
{
extSessionId = (long)idArr.First();
}
}
}
// We may get an HTML instead of JSON in response.
catch (JsonReaderException)
{
}
return(extSessionId);
}