337 lines
15 KiB
C#
337 lines
15 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using System.Text.RegularExpressions;
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using Umbraco.Core;
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using umbraco.cms.businesslogic.web;
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namespace Umbraco.Web.Routing
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{
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/// <summary>
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/// Provides utilities to handle site domains.
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/// </summary>
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public class SiteDomainHelper : ISiteDomainHelper
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{
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#region Configure
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private static readonly ReaderWriterLockSlim ConfigLock = new ReaderWriterLockSlim();
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private static Dictionary<string, string[]> _sites;
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private static Dictionary<string, List<string>> _bindings;
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private static Dictionary<string, Dictionary<string, string[]>> _qualifiedSites;
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// these are for unit tests *only*
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internal static Dictionary<string, string[]> Sites { get { return _sites; } }
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internal static Dictionary<string, List<string>> Bindings { get { return _bindings; } }
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// these are for validation
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//private const string DomainValidationSource = @"^(\*|((?i:http[s]?://)?([-\w]+(\.[-\w]+)*)(:\d+)?(/[-\w]*)?))$";
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private const string DomainValidationSource = @"^(((?i:http[s]?://)?([-\w]+(\.[-\w]+)*)(:\d+)?(/)?))$";
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private static readonly Regex DomainValidation = new Regex(DomainValidationSource, RegexOptions.IgnoreCase | RegexOptions.Compiled);
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/// <summary>
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/// Returns a disposable object that represents safe write access to config.
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/// </summary>
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/// <remarks>Should be used in a <c>using(SiteDomainHelper.ConfigWriteLock) { ... }</c> mode.</remarks>
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protected static IDisposable ConfigWriteLock
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{
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get { return new WriteLock(ConfigLock); }
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}
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/// <summary>
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/// Returns a disposable object that represents safe read access to config.
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/// </summary>
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/// <remarks>Should be used in a <c>using(SiteDomainHelper.ConfigWriteLock) { ... }</c> mode.</remarks>
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protected static IDisposable ConfigReadLock
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{
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get { return new ReadLock(ConfigLock); }
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}
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/// <summary>
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/// Clears the entire configuration.
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/// </summary>
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public static void Clear()
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{
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using (ConfigWriteLock)
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{
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_sites = null;
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_bindings = null;
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_qualifiedSites = null;
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}
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}
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private static IEnumerable<string> ValidateDomains(IEnumerable<string> domains)
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{
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// must use authority format w/optional scheme and port, but no path
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// any domain should appear only once
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return domains.Select(domain =>
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{
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if (!DomainValidation.IsMatch(domain))
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throw new ArgumentOutOfRangeException("domains", string.Format("Invalid domain: \"{0}\"", domain));
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return domain;
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});
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}
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/// <summary>
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/// Adds a site.
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/// </summary>
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/// <param name="key">A key uniquely identifying the site.</param>
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/// <param name="domains">The site domains.</param>
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/// <remarks>At the moment there is no public way to remove a site. Clear and reconfigure.</remarks>
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public static void AddSite(string key, IEnumerable<string> domains)
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{
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using (ConfigWriteLock)
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{
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_sites = _sites ?? new Dictionary<string, string[]>();
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_sites[key] = ValidateDomains(domains).ToArray();
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_qualifiedSites = null;
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}
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}
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/// <summary>
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/// Adds a site.
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/// </summary>
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/// <param name="key">A key uniquely identifying the site.</param>
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/// <param name="domains">The site domains.</param>
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/// <remarks>At the moment there is no public way to remove a site. Clear and reconfigure.</remarks>
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public static void AddSite(string key, params string[] domains)
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{
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using (ConfigWriteLock)
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{
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_sites = _sites ?? new Dictionary<string, string[]>();
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_sites[key] = ValidateDomains(domains).ToArray();
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_qualifiedSites = null;
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}
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}
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/// <summary>
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/// Removes a site.
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/// </summary>
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/// <param name="key">A key uniquely identifying the site.</param>
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internal static void RemoveSite(string key)
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{
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using (ConfigWriteLock)
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{
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if (_sites != null && _sites.ContainsKey(key))
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{
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_sites.Remove(key);
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if (_sites.Count == 0)
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_sites = null;
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if (_bindings != null && _bindings.ContainsKey(key))
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{
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foreach (var b in _bindings[key])
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{
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_bindings[b].Remove(key);
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if (_bindings[b].Count == 0)
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_bindings.Remove(b);
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}
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_bindings.Remove(key);
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if (_bindings.Count > 0)
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_bindings = null;
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}
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_qualifiedSites = null;
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}
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}
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}
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/// <summary>
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/// Binds some sites.
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/// </summary>
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/// <param name="keys">The keys uniquely identifying the sites to bind.</param>
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/// <remarks>
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/// <para>At the moment there is no public way to unbind sites. Clear and reconfigure.</para>
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/// <para>If site1 is bound to site2 and site2 is bound to site3 then site1 is bound to site3.</para>
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/// </remarks>
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public static void BindSites(params string[] keys)
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{
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using (ConfigWriteLock)
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{
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foreach (var key in keys.Where(key => !_sites.ContainsKey(key)))
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throw new ArgumentException(string.Format("Not an existing site key: {0}", key), "keys");
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_bindings = _bindings ?? new Dictionary<string, List<string>>();
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var allkeys = _bindings
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.Where(kvp => keys.Contains(kvp.Key))
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.SelectMany(kvp => kvp.Value)
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.Union(keys)
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.ToArray();
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foreach (var key in allkeys)
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{
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if (!_bindings.ContainsKey(key))
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_bindings[key] = new List<string>();
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var xkey = key;
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var addKeys = allkeys.Where(k => k != xkey).Except(_bindings[key]);
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_bindings[key].AddRange(addKeys);
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}
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}
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}
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#endregion
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#region Map domains
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/// <summary>
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/// Filters a list of <c>DomainAndUri</c> to pick one that best matches the current request.
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/// </summary>
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/// <param name="current">The Uri of the current request.</param>
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/// <param name="domainAndUris">The list of <c>DomainAndUri</c> to filter.</param>
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/// <returns>The selected <c>DomainAndUri</c>.</returns>
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/// <remarks>
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/// <para>If the filter is invoked then <paramref name="domainAndUris"/> is _not_ empty and
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/// <paramref name="current"/> is _not_ null, and <paramref name="current"/> could not be
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/// matched with anything in <paramref name="domainAndUris"/>.</para>
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/// <para>The filter _must_ return something else an exception will be thrown.</para>
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/// </remarks>
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public virtual DomainAndUri MapDomain(Uri current, DomainAndUri[] domainAndUris)
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{
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var currentAuthority = current.GetLeftPart(UriPartial.Authority);
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var qualifiedSites = GetQualifiedSites(current);
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return MapDomain(domainAndUris, qualifiedSites, currentAuthority);
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}
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/// <summary>
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/// Filters a list of <c>DomainAndUri</c> to pick those that best matches the current request.
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/// </summary>
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/// <param name="current">The Uri of the current request.</param>
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/// <param name="domainAndUris">The list of <c>DomainAndUri</c> to filter.</param>
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/// <param name="excludeDefault">A value indicating whether to exclude the current/default domain.</param>
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/// <returns>The selected <c>DomainAndUri</c> items.</returns>
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/// <remarks>The filter must return something, even empty, else an exception will be thrown.</remarks>
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public virtual IEnumerable<DomainAndUri> MapDomains(Uri current, DomainAndUri[] domainAndUris, bool excludeDefault)
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{
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var currentAuthority = current.GetLeftPart(UriPartial.Authority);
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KeyValuePair<string, string[]>[] candidateSites = null;
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IEnumerable<DomainAndUri> ret = domainAndUris;
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using (ConfigReadLock) // so nothing changes between GetQualifiedSites and access to bindings
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{
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var qualifiedSites = GetQualifiedSitesInsideLock(current);
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if (excludeDefault)
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{
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// exclude the current one (avoid producing the absolute equivalent of what GetUrl returns)
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var hintWithSlash = current.EndPathWithSlash();
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var hinted = domainAndUris.FirstOrDefault(d => d.Uri.EndPathWithSlash().IsBaseOf(hintWithSlash));
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if (hinted != null)
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ret = ret.Where(d => d != hinted);
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// exclude the default one (avoid producing a possible duplicate of what GetUrl returns)
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// only if the default one cannot be the current one ie if hinted is not null
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if (hinted == null && domainAndUris.Any())
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{
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// it is illegal to call MapDomain if domainAndUris is empty
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// also, domainAndUris should NOT contain current, hence the test on hinted
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var mainDomain = MapDomain(domainAndUris, qualifiedSites, currentAuthority); // what GetUrl would get
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ret = ret.Where(d => d != mainDomain);
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}
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}
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// we do our best, but can't do the impossible
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if (qualifiedSites == null)
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return ret;
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// find a site that contains the current authority
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var currentSite = qualifiedSites.FirstOrDefault(site => site.Value.Contains(currentAuthority));
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// if current belongs to a site, pick every element from domainAndUris that also belong
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// to that site -- or to any site bound to that site
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if (!currentSite.Equals(default(KeyValuePair<string, string[]>)))
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{
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candidateSites = new[] { currentSite };
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if (_bindings != null && _bindings.ContainsKey(currentSite.Key))
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{
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var boundSites = qualifiedSites.Where(site => _bindings[currentSite.Key].Contains(site.Key));
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candidateSites = candidateSites.Union(boundSites).ToArray();
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// .ToArray ensures it is evaluated before the configuration lock is exited
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}
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}
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}
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// if we are able to filter, then filter, else return the whole lot
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return candidateSites == null ? ret : ret.Where(d =>
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{
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var authority = d.Uri.GetLeftPart(UriPartial.Authority);
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return candidateSites.Any(site => site.Value.Contains(authority));
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});
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}
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private static Dictionary<string, string[]> GetQualifiedSites(Uri current)
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{
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using (ConfigReadLock)
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{
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return GetQualifiedSitesInsideLock(current);
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}
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}
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private static Dictionary<string, string[]> GetQualifiedSitesInsideLock(Uri current)
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{
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// we do our best, but can't do the impossible
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if (_sites == null)
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return null;
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// cached?
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if (_qualifiedSites != null && _qualifiedSites.ContainsKey(current.Scheme))
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return _qualifiedSites[current.Scheme];
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_qualifiedSites = _qualifiedSites ?? new Dictionary<string, Dictionary<string, string[]>>();
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// convert sites into authority sites based upon current scheme
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// because some domains in the sites might not have a scheme -- and cache
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return _qualifiedSites[current.Scheme] = _sites
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.ToDictionary(
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kvp => kvp.Key,
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kvp => kvp.Value.Select(d => new Uri(UriUtility.StartWithScheme(d, current.Scheme)).GetLeftPart(UriPartial.Authority)).ToArray()
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);
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// .ToDictionary will evaluate and create the dictionary immediately
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// the new value is .ToArray so it will also be evaluated immediately
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// therefore it is safe to return and exit the configuration lock
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}
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private static DomainAndUri MapDomain(DomainAndUri[] domainAndUris, Dictionary<string, string[]> qualifiedSites, string currentAuthority)
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{
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if (domainAndUris == null)
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throw new ArgumentNullException("domainAndUris");
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if (!domainAndUris.Any())
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throw new ArgumentException("Cannot be empty.", "domainAndUris");
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// we do our best, but can't do the impossible
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if (qualifiedSites == null)
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return domainAndUris.First();
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// find a site that contains the current authority
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var currentSite = qualifiedSites.FirstOrDefault(site => site.Value.Contains(currentAuthority));
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// if current belongs to a site - try to pick the first element
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// from domainAndUris that also belongs to that site
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var ret = currentSite.Equals(default(KeyValuePair<string, string[]>))
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? null
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: domainAndUris.FirstOrDefault(d => currentSite.Value.Contains(d.Uri.GetLeftPart(UriPartial.Authority)));
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// no match means that either current does not belong to a site, or the site it belongs to
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// does not contain any of domainAndUris. Yet we have to return something. here, it becomes
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// a bit arbitrary.
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// look through sites in order and pick the first domainAndUri that belongs to a site
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ret = ret ?? qualifiedSites
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.Where(site => site.Key != currentSite.Key)
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.Select(site => domainAndUris.FirstOrDefault(domainAndUri => site.Value.Contains(domainAndUri.Uri.GetLeftPart(UriPartial.Authority))))
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.FirstOrDefault(domainAndUri => domainAndUri != null);
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// random, really
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ret = ret ?? domainAndUris.First();
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return ret;
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}
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#endregion
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}
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}
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