int FindOrCreatePackageId(SharePointFileLocation packageLocation)
{
SPList packagesList = cacheWeb.Lists["Packages"];
string location = packageLocation.ToString();
SPQuery query = new SPQuery();
query.Query = String.Concat(@"<Where>
<Eq>
<FieldRef Name='Title'/>
<Value Type='Text'>", location, @"</Value>
</Eq>
</Where>");
SPListItemCollection items = packagesList.GetItems(query);
if (items.Count == 0)
{
SPListItem item = packagesList.Items.Add();
item["Location"] = location;
item.Update();
return(item.ID);
}
else
{
return(items[0].ID);
}
}
public SharePointLibraryCache(SPWeb web, SPFile file, SharePointFileLocation packageLocation, SharePointCacheSettings cacheSettings)
{
Uri baseWebUri = new Uri(web.Url);
Uri cacheUri = new Uri(baseWebUri, cacheSettings.CachePath);
cacheSite = new SPSite(cacheUri.ToString());
cacheWeb = cacheSite.OpenWeb();
cacheWeb.AllowUnsafeUpdates = true;
try
{
cacheList = cacheWeb.GetList(cacheSettings.CachePath);
}
catch (ArgumentException)
{
throw new CacheException(string.Format(CultureInfo.CurrentUICulture, Resources.InvalidLibraryCache, cacheSettings.CachePath));
}
int packageId = FindOrCreatePackageId(packageLocation);
CacheFolderUrl = string.Concat(cacheWeb.Url, "/", cacheList.RootFolder.Url, "/", packageId.ToString(CultureInfo.InvariantCulture));
cacheFolder = cacheWeb.GetFolder(CacheFolderUrl);
if (cacheFolder.Exists == false)
{
cacheFolder = CreateCacheFolder(packageId.ToString(CultureInfo.InvariantCulture));
UnzipAndCachePackage(file);
}
}
/// <summary>Creates a package reader for a package without accessing the store.</summary>
/// <param name="file">The package.</param>
/// <param name="location">The package location.</param>
/// <param name="runWithElevatedPrivileges">Whether to run with elevated privileges or not.</param>
public PackageReader CreatePackageReader(SPFile file, SharePointFileLocation location, bool runWithElevatedPrivileges)
{
if (SPContentTypeId.FindCommonParent(file.Item.ContentType.Id, permanentCacheContentType) == permanentCacheContentType)
{
object directoryValue = file.Item[new Guid("a76de874-b256-4fd6-8933-813aa8587163")];
if (directoryValue == null)
{
throw new CacheException(Resources.PermanentCacheNoDirectory);
}
else
{
DirectoryInfo directory;
try
{
directory = new DirectoryInfo(directoryValue.ToString());
}
catch (ArgumentException)
{
throw new CacheException(Resources.PermanentCacheInvalidDirectory);
}
catch (PathTooLongException)
{
throw new CacheException(Resources.PermanentCacheInvalidDirectory);
}
return(new PermanentCacheSharePointPackageReader(directory, location));
}
}
else
{
return(new SharePointPackageReader(CacheSettings, location, file, runWithElevatedPrivileges));
}
}
/// <summary>
/// Creates a package reader to read the specified package from SharePoint. This constructor
/// optionally causes the file to be read from SharePoint using elevated permissions.
/// </summary>
/// <param name="cacheSettings">The settings to use for the caching of this package.
/// A subdirectory will be created in the cacheSettings.CachePath location with a cached version of this package.</param>
/// <param name="packageLocation">The location of the package to be read. Any changes to this SharePointFileLocation
/// object after the SharePointPackageReader is created are not reflected in the behavior of this object.</param>
/// <param name="runWithElevatedPrivileges">If true, files in SharePoint are accessed using elevated privileges.
/// If false, the current user credentials are used to access SharePoint files.</param>
/// <param name="file">The SPFile to read.</param>
/// <remarks>
/// <para>
/// In addition to the exceptions listed below, this method may throw exceptions caused by the
/// identity not having access to the <paramref name="cacheSettings"/> CachePath location.
/// </para>
/// <para>
/// The contents of the package are not read in the constructor. The contents of the package are read
/// only once when they are first needed. If the referenced SharePoint file does not contain a
/// valid e-learning package, accessing other methods and properties on this object will result
/// in an <c>InvalidPackageException</c>.
/// </para>
/// <para>
/// If the <paramref name="cacheSettings"/> CacheInvalidPackageAsFile value is true,
/// e-learning packages that do not contain basic package information are saved as
/// files in the cache. In particular, this may increase performance in processing of zip files that do not contain
/// e-learning content. If false, SharePointPackageReader will not cache zip files that are not e-learning
/// content. In that case, an application that wants to cache this file would need to cache it as a
/// CachedSharePointFile. Regardless of the value of this parameter, the SharePointPackageReader will not allow
/// accessing files from within a package that is not e-learning content.
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException">Thrown if any argument is null.</exception>
/// <exception cref="DirectoryNotFoundException">Thrown if the CachePath property of <paramref name="cacheSettings"/>
/// does not exist prior to calling this constructor.</exception>
/// <exception cref="FileNotFoundException">Thrown if the requested file does not exist.</exception>
/// <exception cref="UnauthorizedAccessException">Thrown if the identity doesn't have access to the CachePath provided in the
/// cache settings.</exception>
public SharePointPackageReader(SharePointCacheSettings cacheSettings, SharePointFileLocation packageLocation, SPFile file, bool runWithElevatedPrivileges) : base(packageLocation)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("cacheSettings", cacheSettings);
RunWithElevatedPrivileges useRequestedPrivileges;
if (runWithElevatedPrivileges)
{
useRequestedPrivileges = SPSecurity.RunWithElevatedPrivileges;
}
else
{
useRequestedPrivileges = RunWithCurrentUserPrivileges;
}
CachedPackage.EnsureCache(cacheSettings);
CheckFileExists(file, packageLocation);
// Store variables.
m_settings = cacheSettings.Clone();
CachedPackage cachedPackage = null;
useRequestedPrivileges(delegate
{
cachedPackage = new CachedPackage(m_settings, Location, true);
});
using (cachedPackage)
{
Initialize(new DirectoryInfo(cachedPackage.CacheDir), m_settings.ImpersonationBehavior);
}
}
/// <summary>
/// Creates a package reader to read the specified package from SharePoint. The package
/// must be valid e-learning content.The package
/// is read using the current user's credentials.
/// </summary>
/// <remarks>
/// <para>
/// In addition to the exceptions listed below, this method may throw exceptions caused by the
/// identity not having access to the cacheSettings CachePath location.
/// </para>
/// <para>
/// The contents of the package are not read in the constructor. The contents of the package are read
/// only once when they are first needed. If the referenced SharePoint file does not contain a
/// valid e-learning package, accessing other methods and properties on this object will result
/// in an <c>InvalidPackageException</c>.
/// </para>
/// </remarks>
/// <param name="cacheDirectory"></param>
/// <param name="packageLocation">The location of the package to be read. Any changes to this SharePointFileLocation
/// object after the PermanentCacheSharePointPackageReader is created are not reflected in the behavior of this object.</param>
public PermanentCacheSharePointPackageReader(DirectoryInfo cacheDirectory, SharePointFileLocation packageLocation) : base(packageLocation)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("cacheDirectory", cacheDirectory);
Utilities.ValidateParameterNonNull("packageLocation", packageLocation);
Initialize(cacheDirectory, ImpersonationBehavior.UseOriginalIdentity);
}
/// <summary>
/// Creates a package reader to read the specified package from SharePoint. This constructor
/// optionally causes the file to be read from SharePoint using elevated permissions.
/// </summary>
/// <param name="cacheSettings">The settings to use for the caching of this package.
/// A subdirectory will be created in the cacheSettings.CachePath location with a cached version of this package.</param>
/// <param name="packageLocation">The location of the package to be read. Any changes to this SharePointFileLocation
/// object after the SharePointLibraryPackageReader is created are not reflected in the behavior of this object.</param>
/// <param name="file">The file to create the reader for.</param>
/// <remarks>
/// <para>
/// In addition to the exceptions listed below, this method may throw exceptions caused by the
/// identity not having access to the <paramref name="cacheSettings"/> CachePath location.
/// </para>
/// <para>
/// The contents of the package are not read in the constructor. The contents of the package are read
/// only once when they are first needed. If the referenced SharePoint file does not contain a
/// valid e-learning package, accessing other methods and properties on this object will result
/// in an <c>InvalidPackageException</c>.
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException">Thrown if any argument is null.</exception>
/// <exception cref="FileNotFoundException">Thrown if the requested file does not exist.</exception>
/// <exception cref="UnauthorizedAccessException">Thrown if the identity doesn't have access to the CachePath provided in the
/// cache settings.</exception>
public SharePointLibraryPackageReader(SharePointCacheSettings cacheSettings, SharePointFileLocation packageLocation, SPFile file) : base(packageLocation)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("cacheSettings", cacheSettings);
SPWeb web = SPContext.Current.Web;
cache = new SharePointLibraryCache(web, file, packageLocation, cacheSettings);
}
/// <summary>
/// Internal copy constructor.
/// </summary>
/// <param name="copyFrom">Package location to copy from.</param>
internal SharePointFileLocation(SharePointFileLocation copyFrom)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("copyFrom", copyFrom);
SiteId = copyFrom.SiteId;
WebId = copyFrom.WebId;
FileId = copyFrom.FileId;
VersionId = copyFrom.VersionId;
Timestamp = copyFrom.Timestamp;
}
/// <summary>
/// Gets the directory that the package (specified by packageLocation)
/// would be cached into.
/// </summary>
/// <param name="cachePath">The folder to use for a cache of all SharePoint files.</param>
/// <param name="impersonationBehavior">The impersonation behaviour to use.</param>
/// <param name="packageLocation">The package loacation in LearningStore format.</param>
/// <returns>The directory path to the cached package.</returns>
internal static string GetCacheDirectory(string cachePath, ImpersonationBehavior impersonationBehavior, string packageLocation)
{
SharePointFileLocation location;
if (!SharePointFileLocation.TryParse(packageLocation, out location))
{
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Resources.SPFormatInvalid, packageLocation));
}
return(SharePointPackageReader.GetCacheDirectory(cachePath, impersonationBehavior, location));
}
void CheckFileExists(SPFile file, SharePointFileLocation packageLocation)
{
if (file.Exists == false)
{
throw new FileNotFoundException(Resources.SPFileNotFoundNoName);
}
string filename = file.Name;
// Now check if the version of the file exists.
if (FileExistsInSharePoint(file, packageLocation.VersionId) == false)
{
throw new FileNotFoundException(String.Format(CultureInfo.CurrentCulture, Resources.SPFileNotFound, filename));
}
}
/// <summary>
/// Constructor. Accesses all SharePoint files with elevated privilege.
/// </summary>
/// <param name="packageStore">The PackageStore that contains information about the package.</param>
/// <param name="packageId">The package id of the package to load.</param>
/// <param name="packageLocation">The location of the package, as defined in
/// LearningStore PackageItem.Location column. This cannot be null.</param>
/// <remarks></remarks>
internal SharePointPackageStoreReader(SharePointPackageStore packageStore, PackageItemIdentifier packageId, string packageLocation)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNotEmpty("packageLocation", packageLocation);
m_store = packageStore;
m_packageId = packageId;
SharePointFileLocation location;
if (!SharePointFileLocation.TryParse(packageLocation, out location))
{
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Resources.SPFormatInvalid, packageLocation));
}
CreatePackageReader(location);
}
void CreatePackageReader(SharePointFileLocation location)
{
SPSecurity.RunWithElevatedPrivileges(delegate
{
// These methods will throw FileNotFoundException if the package does not exist.
// If the site does not exist, this throws FileNotFound
using (SPSite siteElevatedPermissions = new SPSite(location.SiteId))
{
// If the web does not exist, this throws FileNotFound
using (SPWeb webElevatedPermissions = siteElevatedPermissions.OpenWeb(location.WebId))
{
SPFile fileElevatedPermissions = webElevatedPermissions.GetFile(location.FileId);
m_spPackageReader = m_store.CreatePackageReader(fileElevatedPermissions, location, true);
}
}
});
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")] // invalid values return false
public static bool TryParse(string locationValue, out SharePointFileLocation location)
{
Utilities.ValidateParameterNotEmpty("locationValue", locationValue);
location = null;
// if the location was valid, set all out parameter values and return true
try
{
location = new SharePointFileLocation(locationValue);
}
catch
{
// if the location was not valid for any reason, return false
return(false);
}
return(true);
}
/// <summary>
/// Create a representation of a file in SharePoint, running with elevated privileges when
/// accessing the SharePoint file.
/// </summary>
/// <param name="cacheSettings">The settings that determine how the file is cached.</param>
/// <param name="location">The location of the file in SharePoint.</param>
/// <param name="runWithElevatedPrivileges">If true, SharePoint file will be accessed using elevated privileges.</param>
/// <remarks>
/// This method does only verifies that the <c>settings.WindowsIdentity</c> has access to the
/// <c>settings.CachePath</c>. It does not verify that the file exists in SharePoint.
/// The contents of the package are read only once when they are first needed.
/// </remarks>
/// <exception cref="UnauthorizedAccessException">Thrown if the <c>settings.WindowsIdentity</c>
/// does not have appropriate permissions to the <c>settings.CachePath</c> folder.</exception>
public CachedSharePointFile(SharePointCacheSettings cacheSettings, SharePointFileLocation location, bool runWithElevatedPrivileges)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("cacheSettings", cacheSettings);
Utilities.ValidateParameterNonNull("location", location);
m_settings = cacheSettings.Clone();
m_location = location;
if (runWithElevatedPrivileges)
{
m_useRequestedPrivileges = SPSecurity.RunWithElevatedPrivileges;
}
else
{
m_useRequestedPrivileges = RunWithCurrentUserPrivileges;
}
CachedPackage.EnsureCache(cacheSettings);
}
private bool m_disposed; // indicates this object has been disposed
#region constructors
/// <summary>
/// Creates a package reader which reads the package from a file system cache.
/// </summary>
/// <param name="packageLocation">The location of the package to be read. Any changes to this SharePointFileLocation
/// object after the FileSystemBasedSharePointPackageReader is created are not reflected in the behavior of this object.</param>
/// <remarks>
/// <para>
/// In addition to the exceptions listed below, this method may throw exceptions caused by the
/// identity not having access to the CachePath location.
/// </para>
/// <para>
/// The contents of the package are not read in the constructor. The contents of the package are read
/// only once when they are first needed. If the referenced SharePoint file does not contain a
/// valid e-learning package, accessing other methods and properties on this object will result
/// in an <c>InvalidPackageException</c>.
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException">Thrown if any argument is null.</exception>
/// <exception cref="DirectoryNotFoundException">Thrown if the CachePath property
/// does not exist prior to calling this constructor.</exception>
/// <exception cref="FileNotFoundException">Thrown if the requested file does not exist.</exception>
/// <exception cref="UnauthorizedAccessException">Thrown if the identity doesn't have access to the CachePath provided in the
/// cache settings.</exception>
public FileSystemBasedSharePointPackageReader(SharePointFileLocation packageLocation) : base(packageLocation)
{
}
/// <summary>
/// Gets the directory that the package (specified by site, web, file, etc)
/// would be cached into.
/// </summary>
/// <param name="cachePath">The folder to use for a cache of all SharePoint files.</param>
/// <param name="impersonationBehavior">The impersonation behaviour to use.</param>
/// <param name="packageLocation">The location of the package in SharePoint.</param>
/// <returns>The directory path to the cached package.</returns>
internal static string GetCacheDirectory(string cachePath, ImpersonationBehavior impersonationBehavior, SharePointFileLocation packageLocation)
{
return(CachedPackage.GetCacheDirectory(cachePath, packageLocation, impersonationBehavior));
}
/// <summary>Creates a package reader for a package without accessing the store.</summary>
/// <param name="file">The package.</param>
/// <param name="location">The package location.</param>
/// <param name="runWithElevatedPrivileges">Whether to run with elevated privileges or not.</param>
/// <returns></returns>
public PackageReader CreatePackageReader(SPFile file, SharePointFileLocation location, bool runWithElevatedPrivileges)
{
return(new SharePointLibraryPackageReader(CacheSettings, location, file));
}
/// <summary>Initializes a new instance of <see cref="SharePointLocationPackageReader"/>.</summary>
/// <param name="packageLocation">The location of the package.</param>
public SharePointLocationPackageReader(SharePointFileLocation packageLocation)
{
Resources.Culture = Thread.CurrentThread.CurrentCulture;
Utilities.ValidateParameterNonNull("packageLocation", packageLocation);
Location = new SharePointFileLocation(packageLocation);
}
private bool m_disposed; // indicates this object has been disposed
/// <summary>
/// Create a cached copy of a file in SharePoint.
/// </summary>
/// <param name="cacheSettings">The settings that determine how the file is cached.</param>
/// <param name="location">The location of the file in SharePoint.</param>
/// <remarks>
/// This method does only verifies that the <c>settings.WindowsIdentity</c> has access to the
/// <c>settings.CachePath</c>. It does not verify that the file exists in SharePoint.
/// The contents of the package are read only once when they are first needed.
/// </remarks>
public CachedSharePointFile(SharePointCacheSettings cacheSettings, SharePointFileLocation location)
: this(cacheSettings, location, false)
{
}