/// <summary>
/// Constructor.
/// </summary>
internal ProcessingUrlEventArgs(
DownloadedResourceInformation uriInfo,
int depth)
{
this.uriInfo = uriInfo;
this.depth = depth;
}
/// <summary>
/// Check whether a file was already downloaded.
/// </summary>
/// <param name="uriInfo">The URI info.</param>
/// <returns>
/// <c>true</c> if [has downloaded URI] [the specified URI info];
/// otherwise, <c>false</c>.
/// </returns>
public bool HasDownloadedUri(
DownloadedResourceInformation uriInfo)
{
// Search whether exists in list.
int foundPosition =
_temporaryDownloadedResourceInfos.IndexOf(
uriInfo);
if (foundPosition < 0)
{
return(false);
}
else
{
// Found. Check various attributes.
DownloadedResourceInformation foundInfo =
_temporaryDownloadedResourceInfos[foundPosition];
if (foundInfo.AddedByProcessID ==
Process.GetCurrentProcess().Id)
{
return(true);
}
else if (foundInfo.DateAdded.AddHours(10) > DateTime.Now)
{
return(true);
}
else
{
return(foundInfo.FileExists);
}
}
}
/// <summary>
/// Add information about a downloaded resource.
/// </summary>
/// <param name="info">The info.</param>
public void AddDownloadedResourceInfo(
DownloadedResourceInformation info)
{
if (_temporaryDownloadedResourceInfos.Contains(info))
{
_temporaryDownloadedResourceInfos.Remove(info);
}
_temporaryDownloadedResourceInfos.Add(info);
}
/// <summary>
/// The URLs where to continue parsing when the stack trace gets too deep.
/// </summary>
/// <value>The continue downloaded resource infos.</value>
public void AddContinueDownloadedResourceInfos(
DownloadedResourceInformation resourceInfo)
{
if (_continueDownloadedResourceInfos.Contains(resourceInfo))
{
_continueDownloadedResourceInfos.Remove(resourceInfo);
}
_continueDownloadedResourceInfos.Add(resourceInfo);
Persist();
}
/// <summary>
/// Stores a HTML resource to the local file system.
/// Does no hyperlink replacement.
/// </summary>
/// <returns>Return the info about the stored data.</returns>
public DownloadedResourceInformation StoreHtml(
string textContent,
Encoding encoding,
UriResourceInformation uriInfo)
{
DownloadedResourceInformation result =
new DownloadedResourceInformation(
uriInfo,
_settings.Options.DestinationFolderPath);
try
{
if (result.LocalFilePath.Exists)
{
result.LocalFilePath.Delete();
}
if (!result.LocalFilePath.Directory.Exists)
{
result.LocalFilePath.Directory.Create();
}
Trace.WriteLine(
string.Format(
@"Writing text content to file '{0}'.",
result.LocalFilePath));
using (FileStream s = new FileStream(
result.LocalFilePath.FullName,
FileMode.Create,
FileAccess.Write))
using (StreamWriter w = new StreamWriter(s, encoding))
{
w.Write(textContent);
}
}
catch (IOException x)
{
Trace.WriteLine(
string.Format(
@"Ignoring IO exception while storing HTML file: '{0}'.",
x.Message));
}
catch (UnauthorizedAccessException x)
{
Trace.WriteLine(
string.Format(
@"Ignoring exception while storing HTML file: '{0}'.",
x.Message));
}
return(result);
}
/// <summary>
/// Stores a binary resource to the local file system.
/// </summary>
/// <returns>Return the info about the stored data.</returns>
public DownloadedResourceInformation StoreBinary(
byte[] binaryContent,
UriResourceInformation uriInfo)
{
DownloadedResourceInformation result =
new DownloadedResourceInformation(
uriInfo,
_settings.Options.DestinationFolderPath);
try
{
if (result.LocalFilePath.Exists)
{
result.LocalFilePath.Delete();
}
if (binaryContent != null && binaryContent.Length > 0)
{
Trace.WriteLine(
string.Format(
@"Writing binary content to file '{0}'.",
result.LocalFilePath));
using (FileStream s = result.LocalFilePath.OpenWrite())
{
s.Write(binaryContent, 0, binaryContent.Length);
}
}
}
catch (IOException x)
{
Trace.WriteLine(
string.Format(
@"Ignoring IO exception while storing binary file: '{0}'.",
x.Message));
}
catch (UnauthorizedAccessException x)
{
Trace.WriteLine(
string.Format(
@"Ignoring exception while storing binary file: '{0}'.",
x.Message));
}
return(result);
}
/// <summary>
/// Pops the continue downloaded resource infos.
/// </summary>
/// <returns>Returns the first entry or NULL if none.</returns>
public DownloadedResourceInformation PopContinueDownloadedResourceInfos()
{
if (_continueDownloadedResourceInfos.Count <= 0)
{
return(null);
}
else
{
DownloadedResourceInformation result =
_continueDownloadedResourceInfos[0];
_continueDownloadedResourceInfos.RemoveAt(0);
Persist();
return(result);
}
}
/// <summary>
/// Persist information about a downloaded resource.
/// </summary>
/// <param name="uriInfo">The URI info.</param>
public void PersistDownloadedResourceInfo(
DownloadedResourceInformation uriInfo)
{
int foundPosition =
_temporaryDownloadedResourceInfos.IndexOf(
uriInfo);
DownloadedResourceInformation foundInfo =
_temporaryDownloadedResourceInfos[foundPosition];
// --
// Move over.
if (_persistentDownloadedResourceInfos.Contains(foundInfo))
{
_persistentDownloadedResourceInfos.Remove(foundInfo);
}
_persistentDownloadedResourceInfos.Add(foundInfo);
// And store.
Persist();
}
/// <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(@"""Resources\{0}""", dlInfo.LocalFileName),
RegexOptions.IgnoreCase | RegexOptions.Multiline);
textContent = Regex.Replace(
textContent,
string.Format(@"'{0}'", link),
string.Format(@"'Resources\{0}'", dlInfo.LocalFileName),
RegexOptions.IgnoreCase | RegexOptions.Multiline);
// For style-"url(...)"-links.
textContent = Regex.Replace(
textContent,
string.Format(@"\(\s*{0}\s*\)", link),
string.Format(@"(Resources\{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))
{
}
else
{
// Remember.
replacedLinks[linkInfo.AbsoluteUri.AbsolutePath] =
linkInfo.AbsoluteUri.AbsolutePath;
}
}
// */
}
}
// --
return(textContent);
}
/// <summary>
/// Performs the complete downloading (synchronously).
/// Does return only when completely finished or when an exception
/// occured.
/// </summary>
public void Process()
{
string baseUrl =
_settings.Options.DownloadUri.OriginalString.TrimEnd('/').
Split('?')[0];
if (_settings.Options.DownloadUri.AbsolutePath.IndexOf('/') >= 0 &&
_settings.Options.DownloadUri.AbsolutePath.Length > 1)
{
baseUrl = baseUrl.Substring(0, baseUrl.LastIndexOf('/'));
}
// --
// The URI that is configured to be the start URI.
Uri baseUri = new Uri(baseUrl, UriKind.Absolute);
// The initial seed.
DownloadedResourceInformation seedInfo =
new DownloadedResourceInformation(
_settings.Options,
@"/",
_settings.Options.DownloadUri,
baseUri,
_settings.Options.DestinationFolderPath,
_settings.Options.DestinationFolderPath,
UriType.Content);
// --
// Add the first one as the seed.
if (!_settings.HasContinueDownloadedResourceInfos)
{
_settings.AddContinueDownloadedResourceInfos(seedInfo);
}
// 2007-07-27, Uwe Keim:
// Doing a multiple looping, to avoid stack overflows.
// Since a download-"tree" (i.e. the hierachy of all downloadable
// pages) can get _very_ deep, process one part at a time only.
// The state is already persisted, so we need to set up again at
// the previous position.
int index = 0;
while (_settings.HasContinueDownloadedResourceInfos)
{
// Fetch one.
DownloadedResourceInformation processInfo =
_settings.PopContinueDownloadedResourceInfos();
Trace.WriteLine(
string.Format(
@"{0}. loop: Starting processing URLs from '{1}'.",
index + 1,
processInfo.AbsoluteUri.AbsoluteUri));
// Process the URI, add any continue URIs to start
// again, later.
ProcessUrl(processInfo, 0);
index++;
}
Trace.WriteLine(
string.Format(
@"{0}. loop: Finished processing URLs from seed '{1}'.",
index + 1,
_settings.Options.DownloadUri));
}
// ------------------------------------------------------------------
#endregion
#region Private methods.
// ------------------------------------------------------------------
/// <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)
{
Trace.WriteLine(
string.Format(
@"Processing URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
string ext = DownloadedResourceInformation.CorrectFileExtension(DownloadedResourceInformation.TryExtractFileExtension(uriInfo.AbsoluteUri));
if (ext == ".html" && _settings.Options.MaximumLinkDepth >= 0 &&
depth > _settings.Options.MaximumLinkDepth)
{
Trace.WriteLine(
string.Format(
@"Depth {1} exceeds maximum configured depth. Ending recursion " +
@"at URI '{0}'.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
}
else if (depth > _maxDepth)
{
Trace.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))
{
Trace.WriteLine(
string.Format(
@"URI '{0}' was already downloaded. NOT continuing later.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
else
{
_settings.AddDownloadedResourceInfo(uriInfo);
// Finished the function.
Trace.WriteLine(
string.Format(
@"Added URI '{0}' to continue later.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
else
{
// If we are in asynchron mode, periodically check for stopps.
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))
{
Trace.WriteLine(
string.Format(
@"URI '{0}' was already downloaded. Skipping.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
else
{
Trace.WriteLine(
string.Format(
@"URI '{0}' was not already downloaded. Processing.",
uriInfo.AbsoluteUri.AbsoluteUri));
if (uriInfo.LinkType == UriType.Resource)
{
Trace.WriteLine(
string.Format(
@"Processing resource URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
byte[] binaryContent;
ResourceDownloader.DownloadBinary(
uriInfo.AbsoluteUri,
out binaryContent,
_settings.Options);
ResourceStorer storer =
new ResourceStorer(_settings);
storer.StoreBinary(
binaryContent,
uriInfo);
_settings.AddDownloadedResourceInfo(uriInfo);
_settings.PersistDownloadedResourceInfo(uriInfo);
}
else
{
Trace.WriteLine(
string.Format(
@"Processing content URI '{0}', with depth {1}.",
uriInfo.AbsoluteUri.AbsoluteUri,
depth));
string textContent;
string encodingName;
Encoding encoding;
byte[] binaryContent;
ResourceDownloader.DownloadHtml(
uriInfo.AbsoluteUri,
out textContent,
out encodingName,
out encoding,
out binaryContent,
_settings.Options);
ResourceParser parser = new ResourceParser(
_settings,
uriInfo,
textContent);
List <UriResourceInformation> linkInfos =
parser.ExtractLinks();
ResourceRewriter rewriter =
new ResourceRewriter(_settings);
textContent = rewriter.ReplaceLinks(
textContent,
uriInfo);
ResourceStorer storer =
new ResourceStorer(_settings);
storer.StoreHtml(
textContent,
encoding,
uriInfo);
// Add before parsing childs.
_settings.AddDownloadedResourceInfo(uriInfo);
foreach (UriResourceInformation linkInfo in linkInfos)
{
DownloadedResourceInformation dlInfo =
new DownloadedResourceInformation(
linkInfo,
uriInfo.LocalFolderPath,
uriInfo.LocalBaseFolderPath);
// Recurse.
ProcessUrl(dlInfo, depth + 1);
// 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);
}
Trace.WriteLine(
string.Format(
@"Finished processing URI '{0}'.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
else
{
Trace.WriteLine(
string.Format(
@"URI '{0}' is not processable. Skipping.",
uriInfo.AbsoluteUri.AbsoluteUri));
}
}
}
