public static async Task <int> ExtractSemestersCount()
{
await CoursesClient.LazyRefresh();
var profileHtml = await CoursesClient.SessionClient.GetStringAsyncHttp(CoursesProfileAllCoursesUrl);
var doc = new HtmlDocument();
doc.LoadHtml(profileHtml);
var coursesLinks = doc.DocumentNode.SelectNodes(XPathFilterProfileCoursesLinks);
var semestersCount =
SemesterCoursesLongFormNameRegex
.Reverse()
.Select(pair => new
{
Number = pair.Key,
Courses = coursesLinks
.Where(node => Regex.IsMatch(node.InnerText, pair.Value))
})
.First(semester => semester.Courses.Any())
.Number;
return(semestersCount);
}
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);
}
public static async Task Init()
{
Console.OutputEncoding = Encoding.UTF8;
await CoursesClient.LazyRefresh();
SharedVars.CurrentSemesterNumber = await CoursesExtractor.ExtractSemestersCount();
}
private async Task ExtractExternalUrlAndTitle()
{
await CoursesClient.LazyRefresh();
using (var html = await CoursesClient.SessionClient.GetStreamAsyncHttp(Url))
{
var title = LazyHtmlParser.FindTitleInHtml(html);
Title = title;
IsTitleExtracted = true;
}
}
protected override async Task GetAndSaveFile(string filename)
{
await CoursesClient.LazyRefresh();
ReportProgress(0, 1024);
var html = await ExtractMainHtml();
ReportProgress(html.Length / 2.0, html.Length);
var pdf = GeneratePdf(html);
ReportProgress(pdf.Length * 0.9, pdf.Length);
File.WriteAllBytes(filename, pdf);
ReportProgress(pdf.Length, pdf.Length);
}
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;
}
}
}
}
public async Task Download(string[] middlePath)
{
await CoursesClient.LazyRefresh();
await GetNameFromUrlNow();
string filename;
switch (SharedVars.NamingMethod)
{
case NamingMethod.CoursesName:
filename = FileFromCourses.FileNameAndExtensionOnly;
break;
case NamingMethod.UrlName:
filename = FileFromUrl.FileNameAndExtensionOnly;
break;
default:
filename = FileFromUrl.FileNameAndExtensionOnly;
break;
}
var filepath = FileNameHelpers.FullyPrepareFile(filename, middlePath);
FileFromUrl.FullPathAndFileAndExtension = FileFromCourses.FullPathAndFileAndExtension = filepath;
var fileInfo = new FileInfo(filepath);
if (!fileInfo.Directory?.Exists ?? false)
{
fileInfo.Directory.Create();
}
await GetAndSaveFile(filepath);
}
protected override async Task GetAndSaveFile(string filename)
{
await CoursesClient.LazyRefresh();
CoursesClient.AddEvent(DownloadProgressTracker);
// we request headers because otherwise the file is first put into memory so we lose the whole point of streams
// since we are using ReadAsStreamAsync, nothing is loaded into memory
// although we can't use HeadersResponse from previously because that way we can't track progress
using (var file = await CoursesClient.SessionClient.GetHeadersAsyncHttp(DownloadUrl))
{
using (var fileStream = File.Create(filename))
{
using (var content = await file.Content.ReadAsStreamAsync())
{
await content.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
}
}
CoursesClient.RemoveEvent(DownloadProgressTracker);
}
public static async Task <List <ISection> > ExtractSectionsForCourse(ICourseLink courseLink)
{
await CoursesClient.LazyRefresh();
var coursePageText = await CoursesClient.SessionClient.GetStringAsyncHttp(courseLink.Url);
CoursesClient.FindSessKey(coursePageText);
var doc = new HtmlDocument();
doc.LoadHtml(coursePageText);
var headersLinks = doc.DocumentNode.SelectNodes(XPathFilterLinksHeadersFolders);
SharedVars.Sections = new List <ISection>();
var currentSection = new Section();
SharedVars.Sections.Add(currentSection);
foreach (var headerLink in headersLinks)
{
var itemType = TryGetItemType(headerLink);
string innerText = null;
string href = null;
if (itemType != ItemType.Header)
{
innerText = headerLink.Descendants().First(d => d.Name == "#text").InnerText.DecodeHtml();
href = headerLink.Attributes.First(l => l.Name == "href").Value;
}
switch (itemType)
{
case ItemType.Header:
var headerName = headerLink.InnerText.DecodeHtml();
var headerTag = headerLink.OriginalName;
var headerId = FindIdFromAncestors(headerLink);
currentSection = new Section(new Header(headerName, headerTag, headerId), courseLink);
SharedVars.Sections.Add(currentSection);
break;
case ItemType.File:
currentSection.Links.Add(new FileLink(innerText, href, currentSection));
break;
case ItemType.Folder:
currentSection.Links.Add(new FolderLink(innerText, href, currentSection));
break;
case ItemType.Url:
currentSection.Links.Add(new ExternalLink(innerText, href, currentSection));
break;
case ItemType.Page:
currentSection.Links.Add(new PageLink(innerText, href, currentSection));
break;
default:
throw new ArgumentOutOfRangeException();
}
}
SharedVars.Sections = SharedVars.Sections.Where(s => s.Links.Any()).ToList();
return(SharedVars.Sections);
}
