private string GetExamPage(CoursesTakenType coursesType, bool shouldRecurse = true)
{
// AWFUL CODE, BLAME SUSI
// Send a post request with predefined values of the hidden fields
string data = string.Format(HiddenFieldValues.FormattedExamFormData, HttpUtility.UrlEncode(this.vstate));
switch (coursesType)
{
case CoursesTakenType.NotTaken:
data += HiddenFieldValues.NotTakenCoursesFlag;
break;
case CoursesTakenType.Taken:
data += HiddenFieldValues.TakenCoursesFlag;
break;
default:
data += HiddenFieldValues.TakenCoursesFlag + HiddenFieldValues.NotTakenCoursesFlag;
break;
}
WebResponse response = this.SendRequest(SusiPages.ReportExams, data);
// Since SUSI sucks, in order to get the courses page we first need the value of a special hidden field - _VSTATE.
// Unfortunately, _VSTATE has different value on other pages, so first need to get its value from the current response,
// Then send another request with the updated value (which is what the recursion is for)
if (shouldRecurse)
{
ExtractVstate(response);
return(this.GetExamPage(coursesType, false));
}
// If everything else is ok return the whole page
return(ReadResponseToEnd(response));
}
/// <summary>
/// Gets a collection of <see cref="CourseInfo"/> that shows all courses that the student has passed successfully.
/// </summary>
public IEnumerable <CourseInfo> GetCourses(CoursesTakenType coursesType)
{
if (this.Cookies.Count == 0)
{
throw new InvalidOperationException("You must login prior to getting info from SUSI");
}
#if !DEBUG
try
{
#endif
// Get the exam page and parse it
string examPage = this.GetExamPage(coursesType);
HtmlDocument document = new HtmlDocument();
document.LoadHtml(examPage);
// Use a magical xpath to get all rows of the courses table, there may be header rows though
string xpath = @"/html/body/form/table/tr/td/table[@width=""100%""]/tr/td/table/tr[not(@class)]";
var nodes = document.DocumentNode.SelectNodes(xpath);
// Set the culture to BG, else parsing doubles will fail
CultureInfo culture = Thread.CurrentThread.CurrentCulture;
Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("bg-BG");
List <CourseInfo> courseInfos = new List <CourseInfo>();
foreach (HtmlNode node in nodes)
{
// Each tr has 6 tds inside in the following order:
// Subject Teacher Type(elective or not) Taken Grade Credits
HtmlNodeCollection children = node.SelectNodes("td");
// If the first cell contains the following magic word, the row is a header, ignore it
if (children[0].InnerText.Contains("Предмет"))
{
continue;
}
CourseInfo courseInfo = ExtractCourseInfo(children);
courseInfos.Add(courseInfo);
}
// Set the culture back to whatever it was
Thread.CurrentThread.CurrentCulture = culture;
return(courseInfos);
#if !DEBUG
}
catch (Exception e)
{
// In case something failed, throw a new exception
throw new WebException("Can't load data from SUSI", e);
}
#endif
}
public void LogCoursesRequest(string ip, CoursesTakenType type)
{
writer.WriteLine("[{0}] COURSES: Request about [{1}] courses served to address [{2}].", DateTime.UtcNow, type, ip);
}
/// <summary>
/// Gets a collection of <see cref="CourseInfo"/> that shows all courses that the student has passed successfully.
/// </summary>
public IEnumerable<CourseInfo> GetCourses(CoursesTakenType coursesType)
{
if (this.Cookies.Count == 0)
{
throw new InvalidOperationException("You must login prior to getting info from SUSI");
}
#if !DEBUG
try
{
#endif
// Get the exam page and parse it
string examPage = this.GetExamPage(coursesType);
HtmlDocument document = new HtmlDocument();
document.LoadHtml(examPage);
// Use a magical xpath to get all rows of the courses table, there may be header rows though
string xpath = @"/html/body/form/table/tr/td/table[@width=""100%""]/tr/td/table/tr[not(@class)]";
var nodes = document.DocumentNode.SelectNodes(xpath);
// Set the culture to BG, else parsing doubles will fail
CultureInfo culture = Thread.CurrentThread.CurrentCulture;
Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("bg-BG");
List<CourseInfo> courseInfos = new List<CourseInfo>();
foreach (HtmlNode node in nodes)
{
// Each tr has 6 tds inside in the following order:
// Subject Teacher Type(elective or not) Taken Grade Credits
HtmlNodeCollection children = node.SelectNodes("td");
// If the first cell contains the following magic word, the row is a header, ignore it
if (children[0].InnerText.Contains("Предмет"))
continue;
CourseInfo courseInfo = ExtractCourseInfo(children);
courseInfos.Add(courseInfo);
}
// Set the culture back to whatever it was
Thread.CurrentThread.CurrentCulture = culture;
return courseInfos;
#if !DEBUG
}
catch (Exception e)
{
// In case something failed, throw a new exception
throw new WebException("Can't load data from SUSI", e);
}
#endif
}
private string GetExamPage(CoursesTakenType coursesType, bool shouldRecurse = true)
{
// AWFUL CODE, BLAME SUSI
// Send a post request with predefined values of the hidden fields
string data = string.Format(HiddenFieldValues.FormattedExamFormData, HttpUtility.UrlEncode(this.vstate));
switch (coursesType)
{
case CoursesTakenType.NotTaken:
data += HiddenFieldValues.NotTakenCoursesFlag;
break;
case CoursesTakenType.Taken:
data += HiddenFieldValues.TakenCoursesFlag;
break;
default:
data += HiddenFieldValues.TakenCoursesFlag + HiddenFieldValues.NotTakenCoursesFlag;
break;
}
WebResponse response = this.SendRequest(SusiPages.ReportExams, data);
// Since SUSI sucks, in order to get the courses page we first need the value of a special hidden field - _VSTATE.
// Unfortunately, _VSTATE has different value on other pages, so first need to get its value from the current response,
// Then send another request with the updated value (which is what the recursion is for)
if (shouldRecurse)
{
ExtractVstate(response);
return this.GetExamPage(coursesType, false);
}
// If everything else is ok return the whole page
return ReadResponseToEnd(response);
}
public void LogCoursesRequest(string ip, CoursesTakenType type)
{
writer.WriteLine("[{0}] COURSES: Request about [{1}] courses served to address [{2}].", DateTime.UtcNow, type, ip);
}
