src/DotNetOpenAuth/OpenId/Extensions/ProviderAuthenticationPolicy/PapeUtilities.cs

   1 //-----------------------------------------------------------------------
   2 // <copyright file="PapeUtilities.cs" company="Andrew Arnott">
   3 //     Copyright (c) Andrew Arnott. All rights reserved.
   4 // </copyright>
   5 //-----------------------------------------------------------------------
   6
   7 namespace DotNetOpenAuth.OpenId.Extensions.ProviderAuthenticationPolicy {
   8         using System;
   9         using System.Collections.Generic;
  10         using System.Globalization;
  11         using System.Linq;
  12         using System.Text;
  13         using DotNetOpenAuth.Messaging;
  14
  15         /// <summary>
  16         /// Utility methods for use by the PAPE extension.
  17         /// </summary>
  18         internal static class PapeUtilities {
  19                 /// <summary>
  20                 /// Looks at the incoming fields and figures out what the aliases and name spaces for auth level types are.
  21                 /// </summary>
  22                 /// <param name="fields">The incoming message data in which to discover TypeURIs and aliases.</param>
  23                 /// <returns>The <see cref="AliasManager"/> initialized with the given data.</returns>
  24                 internal static AliasManager FindIncomingAliases(IDictionary<string, string> fields) {
  25                         AliasManager aliasManager = new AliasManager();
  26
  27                         foreach (var pair in fields) {
  28                                 if (!pair.Key.StartsWith(Constants.AuthLevelNamespaceDeclarationPrefix, StringComparison.Ordinal)) {
  29                                         continue;
  30                                 }
  31
  32                                 string alias = pair.Key.Substring(Constants.AuthLevelNamespaceDeclarationPrefix.Length);
  33                                 aliasManager.SetAlias(alias, pair.Value);
  34                         }
  35
  36                         aliasManager.SetPreferredAliasesWhereNotSet(Constants.AssuranceLevels.PreferredTypeUriToAliasMap);
  37
  38                         return aliasManager;
  39                 }
  40
  41                 /// <summary>
  42                 /// Concatenates a sequence of strings using a space as a separator.
  43                 /// </summary>
  44                 /// <param name="values">The elements to concatenate together..</param>
  45                 /// <returns>The concatenated string of elements.</returns>
  46                 /// <exception cref="FormatException">Thrown if any element in the sequence includes a space.</exception>
  47                 internal static string ConcatenateListOfElements(IEnumerable<string> values) {
  48                         ErrorUtilities.VerifyArgumentNotNull(values, "values");
  49
  50                         StringBuilder valuesList = new StringBuilder();
  51                         foreach (string value in values.Distinct()) {
  52                                 if (value.Contains(" ")) {
  53                                         throw new FormatException(string.Format(CultureInfo.CurrentCulture, OpenIdStrings.InvalidUri, value));
  54                                 }
  55                                 valuesList.Append(value);
  56                                 valuesList.Append(" ");
  57                         }
  58                         if (valuesList.Length > 0) {
  59                                 valuesList.Length -= 1; // remove trailing space
  60                         }
  61                         return valuesList.ToString();
  62                 }
  63         }
  64 }