public void ProcessRequest(HttpContext context)
{
HttpRequest request = context.Request;
HttpResponse response = context.Response;
//Simple protection from external domain requests.
if (request.UrlReferrer != null && !string.Equals(request.Url.Host, request.UrlReferrer.Host, StringComparison.InvariantCultureIgnoreCase))
{
response.Write("<html>\r\n");
response.Write("<head><title>Access Denied</title></head>\r\n");
response.Write("<body>\r\n");
response.Write("<h1>Access Denied</h1>\r\n");
response.Write("</body>\r\n");
response.Write("</html>");
return;
}
if (request.QueryString["epub"] == null || request.QueryString["epub"].Trim() == string.Empty)
{
throw new FileNotFoundException();
}
Epub epub = new Epub(ConfigurationManager.AppSettings["EpubFilesPath"] + request.QueryString["epub"]);
ExtendedData extendedData = epub.ExtendedData[request.QueryString["filePath"]] as ExtendedData;
if (extendedData == null)
{
return;
}
response.ContentType = extendedData.MimeType;
response.BinaryWrite(extendedData.GetContentAsBinary());
}
private void LoadTableOfContents()
{
ExtendedData extendedData = ExtendedData[_TocFileName] as ExtendedData;
if (extendedData == null)
{
return;
}
XElement xElement = XElement.Parse(extendedData.Content);
XNamespace xNamespace = xElement.Attribute("xmlns") != null
? xElement.Attribute("xmlns").Value
: XNamespace.None;
//Developer: Brian Kenney
//Date: 7/29/2012
//
//some files have the namespace prefix of ncx
//if it does then then xNamespace will evaluate to None
if (xNamespace != XNamespace.None)
{
TOC = GetNavigationChildren(xElement.Element(xNamespace + "navMap").Elements(xNamespace + "navPoint"),
xNamespace);
}
else
{
//Change: Brian Kenney
//Date: 7/29/2012
//Change: duplicate dictionary key
//Details: the file may have an ncx namespace prefix
//romeve the ncx prefix itself
XDocument xDocument = XDocument.Parse(@extendedData.Content);
xDocument.Root.Add(new XAttribute("xmlns", "http://www.daisy.org/z3986/2005/ncx/"));
xDocument.Root.Attributes(XNamespace.Xmlns + "ncx").Remove();
xElement = XElement.Parse(xDocument.ToString());
xNamespace = xElement.Attribute("xmlns") != null?xElement.Attribute("xmlns").Value : XNamespace.None;
if (xNamespace != XNamespace.None)
{
TOC =
GetNavigationChildren(
xElement.Element(xNamespace + "navMap").Elements(xNamespace + "navPoint"), xNamespace);
}
}
}
private void LoadManifestSectionFromOpfFile(XElement contentOpf, XNamespace xNamespace)
{
//NOTE: with the content.opf file
//NOTE: grab the idref from the spine element and
//NOTE: find a match corresponding to the elements listed under the manifest section
HashSet <string> alreadyProcessedFiles = new HashSet <string>(StringComparer.CurrentCultureIgnoreCase);
foreach (var spinElement in contentOpf.Elements(xNamespace + "spine").Elements())
{
var itemElement = contentOpf.Elements(xNamespace + "manifest").Elements().FirstOrDefault(
e =>
e.Attribute("id").Value == spinElement.Attribute("idref").Value);
if (itemElement == null)
{
throw new Exception("Invalid epub file.");
}
else if (itemElement == null)
{
continue;
}
string fileName = Uri.UnescapeDataString(itemElement.Attribute("href").Value);
ZipEntry contentZipEntry = _EpubFile.GetEntry(_ContentOpfPath + fileName);
if (contentZipEntry == null)
{
throw new Exception("Invalid epub file.");
}
else if (contentZipEntry == null)
{
continue;
}
//
//Developer: Brian Kenney
//Date: 7/29/2012
//Change: duplicate dictionary key
//Details: ran into a mis-packaged epub file added key check
//to ensure that we don't crash should someone mispackage
//
//check to see if fileName has already been added to Content dictionary
if (!Content.Values.Any(item => item.FileName == fileName))
{
Content.Add(fileName, new ContentData(fileName, _EpubFile, contentZipEntry));
}
if (!alreadyProcessedFiles.Contains(spinElement.Attribute("idref").Value))
{
alreadyProcessedFiles.Add(spinElement.Attribute("idref").Value);
}
}
//grab the rest of the elements not already processed in the manifest
IEnumerable <XElement> manifestElements =
contentOpf.Elements(xNamespace + "manifest")
.Elements()
.Where(e => !alreadyProcessedFiles.Contains(e.Attribute("id").Value));
foreach (var manifestElement in manifestElements)
{
string fileName = manifestElement.Attribute("href").Value;
ZipEntry extendedZipEntry = _EpubFile.GetEntry(_ContentOpfPath + fileName);
if (extendedZipEntry == null)
{
continue;
}
//check to see if fileName has already been added to Extended dictionary
string trimmedFileName = GetTrimmedFileName(fileName, true);
if (!ExtendedData.Keys.Contains(trimmedFileName))
{
ExtendedData.Add(trimmedFileName,
new ExtendedData(fileName, manifestElement.Attribute("media-type").Value, _EpubFile,
extendedZipEntry));
}
if (string.Equals(manifestElement.Attribute("media-type").Value, "application/x-dtbncx+xml",
StringComparison.CurrentCultureIgnoreCase))
{
_TocFileName = manifestElement.Attribute("href").Value;
}
}
}
