/// <summary>
/// Call this during ModifyData. This returns the file collection ID of the existing or just-inserted file collection.
/// This will return an ID even if there are 0 files in the collection (in other words, no file). No file should always be
/// represented by a non-null file collection ID which happens to have 0 files in it. Null file collection IDs are not supported.
/// </summary>
public int ModifyData()
{
if (fileCollectionId == null)
{
fileCollectionId = BlobFileOps.SystemProvider.InsertFileCollection();
}
var rsFile = uploadedFile.GetPostBackValue(AppRequestState.Instance.EwfPageRequestState.PostBackValues);
if (rsFile != null)
{
BlobFileOps.SystemProvider.DeleteFilesLinkedToFileCollection(fileCollectionId.Value);
BlobFileOps.SystemProvider.InsertFile(fileCollectionId.Value, rsFile.FileName, rsFile.Contents, BlobFileOps.GetContentTypeForPostedFile(rsFile));
}
return(fileCollectionId.Value);
}
/// <summary>
/// Uploaded file cannot be null. But if uploadedFile.HasFile is false, this will be a no-op.
/// Pass null for acceptableFileExtensions if there is no restriction on file extension.
/// PerformAdditionalImageValidation cannot be null but may be an empty delegate.
/// </summary>
public static void ValidateUploadedFile(
Validator validator, EwfFileUpload uploadedFile, string[] acceptableFileExtensions, Action <Validator, System.Drawing.Image> performAdditionalImageValidation,
bool mustBeRenderableImage)
{
var file = uploadedFile.GetPostBackValue(AppRequestState.Instance.EwfPageRequestState.PostBackValues);
if (file == null)
{
return;
}
// Perform generic file validation.
if (acceptableFileExtensions != null && !FileExtensions.MatchesAGivenExtension(file.FileName, acceptableFileExtensions))
{
validator.NoteErrorAndAddMessage(Translation.UnacceptableFileExtension + " " + acceptableFileExtensions.GetCommaDelimitedStringFromCollection());
// Don't bother trying to see if it's an image and parse the image. The file extension message be more detailed than the messages those errors produce.
return;
}
// Perform image-specific validation if necessary.
if (mustBeRenderableImage)
{
// Make sure it is an image according to its content type.
if (!ContentTypes.IsImageType(GetContentTypeForPostedFile(file)))
{
validator.NoteErrorAndAddMessage("Please upload a valid image file.");
}
else
{
// Make sure it is an image type that we understand. Also perform optional custom validation.
try {
using (var stream = new MemoryStream(file.Contents)) {
var image = System.Drawing.Image.FromStream(stream);
performAdditionalImageValidation(validator, image);
}
}
catch (ArgumentException) {
// If we end up in this catch block, it means that System.Drawing.Image does not understand our image. Since we already know that our content type
// is image at this point, this usually means that the file is some sort of unsupported image format, like NEF.
validator.NoteErrorAndAddMessage("The uploaded image file is in an unsupported format.");
}
}
}
}
/// <summary>
/// Uploaded file cannot be null. But if uploadedFile.HasFile is false, this will be a no-op.
/// Pass null for acceptableFileExtensions if there is no restriction on file extension.
/// PerformAdditionalImageValidation cannot be null but may be an empty delegate.
/// </summary>
public static void ValidateUploadedFile(
Validator validator, EwfFileUpload uploadedFile, string[] acceptableFileExtensions, Action<Validator, System.Drawing.Image> performAdditionalImageValidation,
bool mustBeRenderableImage)
{
var file = uploadedFile.GetPostBackValue( AppRequestState.Instance.EwfPageRequestState.PostBackValues );
if( file == null )
return;
// Perform generic file validation.
if( acceptableFileExtensions != null && !FileExtensions.MatchesAGivenExtension( file.FileName, acceptableFileExtensions ) ) {
validator.NoteErrorAndAddMessage( Translation.UnacceptableFileExtension + " " + acceptableFileExtensions.GetCommaDelimitedStringFromCollection() );
// Don't bother trying to see if it's an image and parse the image. The file extension message be more detailed than the messages those errors produce.
return;
}
// Perform image-specific validation if necessary.
if( mustBeRenderableImage ) {
// Make sure it is an image according to its content type.
if( !ContentTypes.IsImageType( GetContentTypeForPostedFile( file ) ) )
validator.NoteErrorAndAddMessage( "Please upload a valid image file." );
else {
// Make sure it is an image type that we understand. Also perform optional custom validation.
try {
using( var stream = new MemoryStream( file.Contents ) ) {
var image = System.Drawing.Image.FromStream( stream );
performAdditionalImageValidation( validator, image );
}
}
catch( ArgumentException ) {
// If we end up in this catch block, it means that System.Drawing.Image does not understand our image. Since we already know that our content type
// is image at this point, this usually means that the file is some sort of unsupported image format, like NEF.
validator.NoteErrorAndAddMessage( "The uploaded image file is in an unsupported format." );
}
}
}
}
