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//
// FilterExternal.cs
//
// Copyright (C) 2006 Novell, Inc.
//
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// The purpose of this filter is to allow users to easily extract text
// content from structured files using an external program. See
// external-filters.txt for more information.
using System;
using System.Collections;
using System.IO;
using System.Diagnostics;
using System.Xml;
using System.Xml.Serialization;
using Beagle.Daemon;
using Beagle.Util;
namespace Beagle.Filters {
public class ExternalFilterInfo {
[XmlElement ("mimetype")]
public string [] MimeTypes;
[XmlElement ("extension")]
public string [] Extensions;
[XmlElement ("command")]
public string Command;
[XmlElement ("arguments")]
public string Arguments;
}
[XmlRoot ("external-filters")]
public class ExternalFilterInfoContainer {
[XmlElement ("filter")]
public ExternalFilterInfo [] Items;
}
public class FilterExternal : Beagle.Daemon.Filter {
private ExternalFilterInfo [] filters = null;
public FilterExternal ()
{
string path = Path.Combine (Path.Combine (ExternalStringsHack.SysConfDir, "beagle"), "external-filters.xml");
try {
FileStream fs = File.Open (path, FileMode.Open, FileAccess.Read, FileShare.Read);
XmlSerializer serializer = new XmlSerializer (typeof (ExternalFilterInfoContainer));
ExternalFilterInfoContainer container = (ExternalFilterInfoContainer) serializer.Deserialize (fs);
fs.Close ();
this.filters = container.Items;
} catch (FileNotFoundException) {
// Probably not an error if the file isn't there.
} catch (DirectoryNotFoundException) {
// The directory isn't there either, not an error.
} catch (InvalidOperationException ex) {
// Something wrong with the XML
Logger.Log.Error (ex, "Unable to parse {0}", path);
} catch (XmlException ex) {
// Something else wrong with the XML
Logger.Log.Error (ex, "Unable to parse {0}", path);
}
if (this.filters == null)
return;
foreach (ExternalFilterInfo efi in this.filters) {
if (efi.MimeTypes != null) {
foreach (string s in efi.MimeTypes) {
FilterFlavor flavor = FilterFlavor.NewFromMimeType (s);
// External filters have higher priority than default ones
// This allows users to override default filters by something they want
flavor.Priority = 1;
AddSupportedFlavor (flavor);
}
}
if (efi.Extensions != null) {
foreach (string s in efi.Extensions) {
FilterFlavor flavor = FilterFlavor.NewFromExtension (s);
flavor.Priority = 1;
AddSupportedFlavor (flavor);
}
}
}
}
private ExternalFilterInfo GetFilterInfo (string extension, string mime_type)
{
if (this.filters == null || this.filters.Length == 0)
return null;
if (extension != null) {
foreach (ExternalFilterInfo efi in this.filters) {
if (efi.Extensions == null)
continue;
if (ArrayFu.IndexOfString (efi.Extensions, extension) != -1)
return efi;
}
}
if (mime_type != null) {
foreach (ExternalFilterInfo efi in this.filters) {
if (efi.MimeTypes == null)
continue;
if (ArrayFu.IndexOfString (efi.MimeTypes, mime_type) != -1)
return efi;
}
}
return null;
}
protected override void DoPull ()
{
ExternalFilterInfo efi = GetFilterInfo (this.Extension, this.MimeType);
if (efi == null) {
Logger.Log.Warn ("Unable to find a match for extension {0}, mime type {1} when one should have matched", this.Extension, this.MimeType);
Error ();
}
// FIXME: Need to deal with quotation marks in the XML file, probably.
string[] tmp_argv = efi.Arguments.Split (' ');
string[] argv = new string [tmp_argv.Length + 1];
argv [0] = efi.Command;
int j = 1;
for (int i = 0; i < tmp_argv.Length; i++) {
if (tmp_argv [i] == String.Empty)
continue;
if (tmp_argv [i] == "%s")
argv [j] = FileInfo.FullName;
else
argv [j] = tmp_argv [i];
j++;
}
SafeProcess pc = new SafeProcess ();
pc.Arguments = argv;
pc.RedirectStandardOutput = true;
try {
pc.Start ();
} catch (SafeProcessException e) {
Log.Warn (e.Message);
Error ();
return;
}
StreamReader pout = new StreamReader (pc.StandardOutput);
string str;
while ((str = pout.ReadLine ()) != null) {
AppendText (str);
AppendStructuralBreak ();
}
pout.Close ();
pc.Close ();
Finished ();
}
}
}
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