/// <summary>
/// Replace URIs inside a given HTML document that was previously
/// downloaded with the local URIs.
/// </summary>
/// <returns>Returns the content text with the replaced links.</returns>
public string ReplaceLinks(
string textContent,
UriResourceInformation uriInfo)
{
ResourceParser parser = new ResourceParser(
_settings,
uriInfo,
textContent);
List<UriResourceInformation> linkInfos =
parser.ExtractLinks();
// For remembering duplicates.
Dictionary<string, string> replacedLinks =
new Dictionary<string, string>();
foreach (UriResourceInformation linkInfo in linkInfos)
{
if (linkInfo.WantFollowUri || linkInfo.IsResourceUri)
{
DownloadedResourceInformation dlInfo =
new DownloadedResourceInformation(
linkInfo,
_settings.Options.DestinationFolderPath);
if (!string.IsNullOrEmpty(linkInfo.OriginalUrl))
{
string textContentBefore = textContent;
string link = Regex.Escape(linkInfo.OriginalUrl);
textContent = Regex.Replace(
textContent,
string.Format(@"""{0}""", link),
string.Format(@"""{0}""", dlInfo.LocalFileName),
RegexOptions.IgnoreCase | RegexOptions.Multiline);
textContent = Regex.Replace(
textContent,
string.Format(@"'{0}'", link),
string.Format(@"'{0}'", dlInfo.LocalFileName),
RegexOptions.IgnoreCase | RegexOptions.Multiline);
// For style-"url(...)"-links.
textContent = Regex.Replace(
textContent,
string.Format(@"\(\s*{0}\s*\)", link),
string.Format(@"({0})", dlInfo.LocalFileName),
RegexOptions.IgnoreCase | RegexOptions.Multiline);
// Some checking.
// 2007-07-27, Uwe Keim.
if (linkInfo.OriginalUrl != dlInfo.LocalFileName.Name &&
textContentBefore == textContent &&
!replacedLinks.ContainsKey(linkInfo.AbsoluteUri.AbsolutePath))
{
throw new ApplicationException(
string.Format(
@"Failed to replace URI '{0}' with URI '{1}' in HTML text '{2}'.",
linkInfo.OriginalUrl,
dlInfo.LocalFileName,
textContent));
}
else
{
// Remember.
replacedLinks[linkInfo.AbsoluteUri.AbsolutePath] =
linkInfo.AbsoluteUri.AbsolutePath;
}
}
// */
}
}
// --
return textContent;
}
// ------------------------------------------------------------------
/// <summary>
/// Process one single URI with a document behind (i.e. no
/// resource URI).
/// </summary>
/// <param name="uriInfo">The URI info.</param>
/// <param name="depth">The depth.</param>
private void ProcessUrl(
DownloadedResourceInformation uriInfo,
int depth, List<iCollector> git, List<iFollower> folo)
{
Console.WriteLine(
string.Format(
@"Processing URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
bool blnFollow = true;
//Check to see if the uriInfo is followable by an internal list
if (depth > 0)
blnFollow = ((from f in folo.ToList()
let matches = f.pattern.Matches(uriInfo.AbsoluteUri.AbsoluteUri.ToString())
where matches.Count > 0 && f.depth == depth
select f).Count()) > 0 ? true : false; //return true if follow exists.
if (_settings.Options.MaximumLinkDepth > -1 &&
depth > _settings.Options.MaximumLinkDepth)
{
Console.WriteLine(
string.Format(
@"Depth {1} exceeds maximum configured depth. Ending recursion " +
@"at URI '{0}'.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
}
else if (!blnFollow)
{
Console.WriteLine(
string.Format(
@"Follower {1} exceeds maximum configured depth. Not following " +
@" URI '{0}'.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
//Fake our way into it.
//_settings.AddDownloadedResourceInfo(uriInfo);
}
else if (depth > _maxDepth)
{
Console.WriteLine(
string.Format(
@"Depth {1} exceeds maximum allowed recursion depth. " +
@"Ending recursion at URI '{0}' to possible continue later.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
// Add myself to start there later.
// But only if not yet process, otherwise we would never finish.
if (_settings.HasDownloadedUri(uriInfo))
{
Console.WriteLine(
string.Format(
@"URI '{0}' was already downloaded. NOT continuing later.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
else
{
_settings.AddDownloadedResourceInfo(uriInfo);
// Finished the function.
Console.WriteLine(
string.Format(
@"Added URI '{0}' to continue later.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
else
{
// If we are in asynchron mode, periodically check for stops.
if (processAsyncBackgroundWorker != null)
{
if (processAsyncBackgroundWorker.CancellationPending)
{
throw new StopProcessingException();
}
}
// --
// Notify event sinks about this URL.
if (ProcessingUrl != null)
{
ProcessingUrlEventArgs e = new ProcessingUrlEventArgs(
uriInfo,
depth);
ProcessingUrl(this, e);
}
// --
if (uriInfo.IsProcessableUri)
{
if (_settings.HasDownloadedUri(uriInfo))
{
Console.WriteLine(
string.Format(
@"URI '{0}' was already downloaded. Skipping.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
else
{
Console.WriteLine(
string.Format(
@"URI '{0}' was not already downloaded. Processing.",
uriInfo.AbsoluteUri.AbsoluteUri));
//Switch case variables.
string textContent;
string encodingName;
Encoding encoding;
byte[] binaryContent;
//Local storage.
ResourceStorer storer = new ResourceStorer(_settings);
ResourceParser parser = null;
List<UriResourceInformation> linkInfos = null;
List<iCollector> req = null;
switch (uriInfo.LinkType)
{
case UriType.Content:
Console.WriteLine(string.Format(@"Processing content URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri, depth));
//Grab the page content.
ResourceDownloader.DownloadHtml(
uriInfo.AbsoluteUri,
out textContent,
out encodingName,
out encoding,
out binaryContent,
_settings.Options);
//Fire-up resource parser (A, FORMS, IMG) parser.
parser = new ResourceParser(
_settings,
uriInfo,
textContent);
//Grab all the Git collector requests, that match the Uri.
req = (from g in _settings.Options.GitCollectionRequest
where g.pageType == UriType.Content
&& uriInfo.AbsoluteUri.AbsoluteUri.ToString().Contains(g.pageName)
&& !(from o in _settings.Parsings
where o.pageType == g.pageType
select o.source.AbsoluteUri.AbsoluteUri)
.Contains(uriInfo.AbsoluteUri.AbsoluteUri)
select g.Clone()).ToList();
//Have valid requests?
if (req.Count() > 0)
{
//Persist the collector results.
_settings.PersistCollectorResultInfo(parser.ExtractCollectorRequest(req));
}
//Process link extraction.
linkInfos = parser.ExtractLinks();
// Add before parsing childs.
_settings.AddDownloadedResourceInfo(uriInfo);
foreach (UriResourceInformation linkInfo in linkInfos)
{
DownloadedResourceInformation dlInfo =
new DownloadedResourceInformation(
linkInfo,
uriInfo.LocalFolderPath,
uriInfo.LocalBaseFolderPath,
linkInfo.Parent,
depth + 1);
// Recurse.
ProcessUrl(dlInfo, depth + 1, git, folo);
// Do not return or break immediately if too deep,
// because this would omit certain pages at this
// recursion level.
}
// Persist after completely parsed childs.
_settings.PersistDownloadedResourceInfo(uriInfo);
break;
case UriType.Resource:
//Console.WriteLine(
//string.Format(
// @"Processing resource URI '{0}', with depth {1}.",
// uriInfo.AbsoluteUri.AbsoluteUri,
// depth));
//Scrape Resource (IMG, JS)
//ResourceDownloader.DownloadBinary(
// uriInfo.AbsoluteUri,
// out binaryContent,
// _settings.Options);
//storer = new ResourceStorer(_settings);
//Save the resource (IMG, JS)
//storer.StoreBinary(
// binaryContent,
// uriInfo);
//Act like we did it.
_settings.AddDownloadedResourceInfo(uriInfo);
_settings.PersistDownloadedResourceInfo(uriInfo);
break;
case UriType.Form:
Console.WriteLine(
string.Format(
@"Processing Form POST to URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
//Grab the Form response content.
ResourceDownloader.DownloadForm(
uriInfo.AbsoluteUri,
out textContent,
out encodingName,
out encoding,
out binaryContent,
_settings.Options);
//Fire-up resource parser (A, FORMS, IMG) parser.
parser = new ResourceParser(
_settings,
uriInfo,
textContent);
var w = _settings.Parsings;
//Grab all the Git collector requests, that match the Uri.
req = (from g in _settings.Options.GitCollectionRequest
where g.pageType == UriType.Form
&& uriInfo.AbsoluteUri.AbsoluteUri.ToString().Contains(g.pageName)
&& !(from o in _settings.Parsings
where o.pageType == g.pageType
select o.source.AbsoluteUri.AbsoluteUri)
.Contains(uriInfo.AbsoluteUri.AbsoluteUri)
select g.Clone()).ToList();
//Have requests?
if (req.Count() > 0)
{
//Persist the collector results.
_settings.PersistCollectorResultInfo(parser.ExtractCollectorRequest(req));
}
//Process link extraction.
linkInfos = parser.ExtractLinks();
// Add before parsing childs.
_settings.AddDownloadedResourceInfo(uriInfo);
foreach (UriResourceInformation linkInfo in linkInfos)
{
DownloadedResourceInformation dlInfo =
new DownloadedResourceInformation(
linkInfo,
uriInfo.LocalFolderPath,
uriInfo.LocalBaseFolderPath,
linkInfo.Parent,
depth + 1);
// Recurse.
ProcessUrl(dlInfo, depth + 1, git, folo);
// Do not return or break immediately if too deep,
// because this would omit certain pages at this
// recursion level.
}
// Persist after completely parsed childs.
_settings.PersistDownloadedResourceInfo(uriInfo);
break;
default:
break;
}
Console.WriteLine(
string.Format(
@"Finished processing URI '{0}'.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
else
{
Console.WriteLine(
string.Format(
@"URI '{0}' is not processable. Skipping.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
}
