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216 lines
10 KiB
C#
216 lines
10 KiB
C#
/* Copyright (c) Citrix Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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using XenAdmin.Core;
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using XenAdmin.XenSearch;
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using XenAPI;
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namespace XenAdmin.Plugins
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{
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/// <summary>
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/// A plugin can specify various URLs, file paths, or command arguments, any of which
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/// may contain placeholders such as {$session_id} or {$ip_address}. These are
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/// replaced at time of use with the appropriate value.
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///
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/// Most values come from the parameters on the (first) selected object, but
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/// {$session_id} is handled specially, and is replaced with the OpaqueRef of a
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/// logged-in session.
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/// </summary>
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internal class Placeholders
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{
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private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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private static Regex PlaceholderRegex = new Regex(@"{\$([\w:]+)}");
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private const string PlaceholderFormat = @"{{${0}}}";
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private const string NULL_PLACEHOLDER_KEY = "null";
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private const string MULTI_TARGET_PLACEHOLDER_KEY = "multi_target";
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/// <summary>
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/// Gets the replacement for the specified placeholder for the specified object.
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/// </summary>
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/// <param name="placeholder">The placeholder to be replaced.</param>
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/// <param name="objs">The objects that the placeholder replacements are for.</param>
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/// <param name="match">A predicate indicating whether the specified placeholder should be replaced.</param>
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/// <returns>The replacement for the specified placeholder.</returns>
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private static string GetPlaceholderReplacement(string placeholder, IList<IXenObject> objs, Predicate<string> match)
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{
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if (match(placeholder))
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{
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if (objs == null || objs.Count == 0)
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return NULL_PLACEHOLDER_KEY;
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if (objs.Count > 1)
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return MULTI_TARGET_PLACEHOLDER_KEY;
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if (placeholder == "session_id")
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{
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if (objs[0].Connection == null || objs[0].Connection.Session == null)
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{
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return NULL_PLACEHOLDER_KEY;
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}
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return objs[0].Connection.Session.uuid;
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}
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else
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{
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// otherwise update url with the latest info
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PropertyNames property = (PropertyNames)Enum.Parse(typeof(PropertyNames), placeholder);
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object val = PropertyAccessors.Get(property)(objs[0]);
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return val != null ? val.ToString() : NULL_PLACEHOLDER_KEY;
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}
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}
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return null;
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}
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/// <summary>
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/// Replaces all placeholders (e.g. {$ip_address}, {$session_id} in the specified text for the specified object array.
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/// Note that if there is more than one object in the array current behaviour is to sub in MULTI_TARGET_PLACEHOLDER_KEY for all situations
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/// </summary>
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/// <param name="text">The text that contains the placeholders to be replaced.</param>
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/// <param name="objs">The objects that the placeholder replacements are for. Can be null.</param>
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/// <param name="match">A predicate indicating whether the specified placeholder should be replaced.</param>
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/// <returns>The processed text.</returns>
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private static string Substitute(string text, IList<IXenObject> objs, Predicate<string> match)
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{
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return PlaceholderRegex.Replace(text, m =>
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{
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try
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{
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return GetPlaceholderReplacement(m.Groups[1].Value, objs, match) ?? m.Value;
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}
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catch (Exception e)
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{
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// Leave the placeholder in; nothing we can do.
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log.Warn(string.Format("Bad placeholder '{0}' in '{1}'", m.Value, text), e);
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return m.Value;
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}
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});
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}
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/// <summary>
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/// Replaces all placeholders (e.g. {$ip_address}, {$session_id} in the specified text for the specified obj.
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/// </summary>
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/// <param name="text">The text that contains the placeholders to be replaced.</param>
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/// <param name="obj">The object that the placeholder replacements are for. Can be null.</param>
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/// <param name="match">A predicate indicating whether the specified placeholder should be replaced.</param>
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/// <returns>The processed text.</returns>
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private static string Substitute(string text, IXenObject obj, Predicate<string> match)
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{
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return Substitute(
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text,
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obj == null ? null : new List<IXenObject>(new IXenObject[] { obj }),
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match);
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}
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/// <summary>
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/// Replaces all placeholders (e.g. {$ip_address}, {$session_id} in the specified text for the specified object array.
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/// Note that if there is more than one object in the array current behaviour is to sub in MULTI_TARGET_PLACEHOLDER_KEY for all situations
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/// </summary>
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/// <param name="text">The text that contains the placeholders to be replaced.</param>
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/// <param name="objs">The objects that the placeholder replacements are for. Can be null.</param>
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/// <returns>The processed text.</returns>
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public static string Substitute(string text, IList<IXenObject> objs)
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{
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Util.ThrowIfParameterNull(text, "text");
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return Substitute(text, objs, s => true);
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}
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/// <summary>
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/// Replaces all placeholders (e.g. {$ip_address}, {$session_id} in the specified text for the specified obj.
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/// </summary>
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/// <param name="text">The text that contains the placeholders to be replaced.</param>
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/// <param name="obj">The object that the placeholder replacements are for. Can be null.</param>
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/// <returns>The processed text.</returns>
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public static string Substitute(string text, IXenObject obj)
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{
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return Substitute(
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text,
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obj == null ? null : new List<IXenObject>(new IXenObject[] { obj }),
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s => true);
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}
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/// <summary>
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/// Replaces all placeholders (e.g. {$ip_address}, {$session_id} in the specified text for the specified obj.
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/// Since ip_address can take several values over different Networks, this method returns a list of Uri for
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/// each of the different IP addresses.
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/// </summary>
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/// <param name="text">The text that contains the placeholders to be replaced.</param>
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/// <param name="obj">The object that the placeholder replacements are for.</param>
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/// <returns>A List of Uris.</returns>
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public static List<Uri> SubstituteUri(string uri, IXenObject obj)
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{
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Util.ThrowIfParameterNull(uri, "uri");
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string ipAddressName = Enum.GetName(typeof(PropertyNames), PropertyNames.ip_address);
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try
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{
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if (!uri.Contains(string.Format(PlaceholderFormat, ipAddressName)))
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{
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return new List<Uri> { new Uri(Substitute(uri, obj)) };
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}
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string u = Substitute(uri, obj, s => s != ipAddressName);
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var ips = (List<ComparableAddress>)PropertyAccessors.Get(PropertyNames.ip_address)(obj);
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if (ips == null || ips.Count == 0)
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{
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return new List<Uri> { new Uri(u) };
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}
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return ips.ConvertAll(ip => new Uri(u.Replace(string.Format(PlaceholderFormat, ipAddressName), ip.ToString())));
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}
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catch (UriFormatException)
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{
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log.Warn(string.Format("Failed to parse url {0}", uri));
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return new List<Uri> { new Uri("about:blank") };
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}
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}
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/// <summary>
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/// Returns a value indicating whether the specified object can supply values for all placeholders
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/// in the specified uri.
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/// </summary>
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/// <param name="uri">The uri string with placeholders to be read.</param>
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/// <param name="obj">The IXenObject to be used for the placeholder substitution.</param>
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/// <returns>A value indicating whether all place-holders could be replaced for this uri.</returns>
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public static bool UriValid(string uri, IXenObject obj)
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{
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return SubstituteUri(uri, obj).TrueForAll(u => u.AbsoluteUri != "about:blank");
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}
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}
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}
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