public static async Task <List <ICourseLink> > ExtractCourses()
{
await CoursesClient.LazyRefresh();
var coursesPageText = await CoursesClient.SessionClient.GetStringAsyncHttp(CoursesProfileAllCoursesUrl);
CoursesClient.FindSessKey(coursesPageText);
var doc = new HtmlDocument();
doc.LoadHtml(coursesPageText);
var coursesLinksNodes = doc.DocumentNode.SelectNodes(XPathFilterProfileCoursesLinks);
var coursesLinksTasks = coursesLinksNodes
.Where(l => Regex.IsMatch(l.InnerText, CurrentSemesterCourseLongFormNameRegex))
.Select(async(l, _) =>
{
var longName = ExtractName(l);
var url = ExtractHref(l);
string shortName;
using (var courseHtml = await CoursesClient.SessionClient.GetStreamAsyncHttp(url))
{
shortName = LazyHtmlParser.FindShortNameInHtml(courseHtml);
shortName = CleanName(shortName, true);
}
return(new CourseLink($"{shortName,-8}{longName}", url));
});
var coursesLinks = await Task.WhenAll(coursesLinksTasks);
SharedVars.Courses = coursesLinks.ToList <ICourseLink>();
return(SharedVars.Courses);
}
private async Task ExtractExternalUrlAndTitle()
{
await CoursesClient.LazyRefresh();
using (var html = await CoursesClient.SessionClient.GetStreamAsyncHttp(Url))
{
var title = LazyHtmlParser.FindTitleInHtml(html);
Title = title;
IsTitleExtracted = true;
}
}
private async Task ExtractExternalUrlAndTitle()
{
await CoursesClient.LazyRefresh();
// Go to url as clicked on courses
using (var coursesResponse = await CoursesClient.SessionClient.GetHeadersAsyncHttp(Url))
{
var externalResponse = coursesResponse;
// if redirected to courses, grab url workaround, get title from there
if (coursesResponse.RequestMessage.RequestUri.Host == CoursesClient.SessionClient.BaseAddress.Host)
{
using (var coursesHtml = await coursesResponse.Content.ReadAsStreamAsync())
{
var urlWorkaround = LazyHtmlParser.FindUrlWorkaroundInHtml(coursesHtml);
ExternalUrl = urlWorkaround;
// Go to url as clicked on workaround url
externalResponse = await CoursesClient.SessionClient.GetHeadersAsyncHttp(urlWorkaround);
}
}
// else redirected to external link, just save it
else
{
var url = coursesResponse.RequestMessage.RequestUri.ToString();
ExternalUrl = url;
}
using (externalResponse)
{
using (var externalHtml = await externalResponse.Content.ReadAsStreamAsync())
{
var title = LazyHtmlParser.FindTitleInHtml(externalHtml);
Title = title;
AreExternalUrlAndTitleExtracted = true;
}
}
}
}
