Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Configuration / HttpCapabilitiesSectionHandler.cs / 2 / HttpCapabilitiesSectionHandler.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Configuration { using System.Collections; using System.Configuration; using System.IO; using System.Security; using System.Security.Permissions; using System.Text.RegularExpressions; using System.Web.Configuration; using System.Web.Util; using System.Xml; using Pair = System.Web.UI.Pair; // // ConfigureCapabilities is used to configure the CapabilitiesEvaluator object // [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class HttpCapabilitiesSectionHandler : IConfigurationSectionHandler { private const int _defaultUserAgentCacheKeyLength = 64; public HttpCapabilitiesSectionHandler() { } class ParseState { internal string SectionName; internal HttpCapabilitiesEvaluator Evaluator; internal ArrayList RuleList = new ArrayList(); internal ArrayList FileList = new ArrayList(); internal bool IsExternalFile = false; internal ParseState() {} } // // As required by IConfigurationSectionHandler // public object Create(object parent, object configurationContext, XmlNode section) { // if called through client config don't even load HttpRuntime if (!HandlerBase.IsServerConfiguration(configurationContext)) { return null; } ParseState parseState = new ParseState(); parseState.SectionName = section.Name; // the rule is going to be the previous rule followed by a list containing the new rules parseState.Evaluator = new HttpCapabilitiesEvaluator((HttpCapabilitiesEvaluator)parent); int userAgentCacheKeyLength = 0; // Get the useragent string cachekey length if (parent != null) { userAgentCacheKeyLength = ((HttpCapabilitiesEvaluator)parent).UserAgentCacheKeyLength; } HandlerBase.GetAndRemovePositiveIntegerAttribute(section, "userAgentCacheKeyLength", ref userAgentCacheKeyLength); if (userAgentCacheKeyLength == 0) { userAgentCacheKeyLength = _defaultUserAgentCacheKeyLength; } parseState.Evaluator.UserAgentCacheKeyLength = userAgentCacheKeyLength; // check for random attributes HandlerBase.CheckForUnrecognizedAttributes(section); // iterate through XML section in order and apply the directives ArrayList sublist; sublist = RuleListFromElement(parseState, section, true); if (sublist.Count > 0) { parseState.RuleList.Add(new CapabilitiesSection(CapabilitiesRule.Filter, null, null, sublist)); } if (parseState.FileList.Count > 0) { parseState.IsExternalFile = true; ResolveFiles(parseState, configurationContext); } // Add the new rules parseState.Evaluator.AddRuleList(parseState.RuleList); return parseState.Evaluator; } // // Create a rule from an element // static CapabilitiesRule RuleFromElement(ParseState parseState, XmlNode element) { int ruletype; DelayedRegex regex; CapabilitiesPattern pat; // grab tag name if (element.Name == "filter") { ruletype = CapabilitiesRule.Filter; } else if (element.Name=="case") { ruletype = CapabilitiesRule.Case; } else if (element.Name == "use") { HandlerBase.CheckForNonCommentChildNodes(element); string var = HandlerBase.RemoveRequiredAttribute(element, "var"); string strAs = HandlerBase.RemoveAttribute(element, "as"); HandlerBase.CheckForUnrecognizedAttributes(element); if (strAs == null) strAs = String.Empty; parseState.Evaluator.AddDependency(var); return new CapabilitiesUse(var, strAs); } else { throw new ConfigurationErrorsException( SR.GetString(SR.Unknown_tag_in_caps_config, element.Name), element); } // grab attributes String matchpat = HandlerBase.RemoveAttribute(element, "match"); String testpat = HandlerBase.RemoveAttribute(element, "with"); HandlerBase.CheckForUnrecognizedAttributes(element); if (matchpat == null) { if (testpat != null) throw new ConfigurationErrorsException(SR.GetString(SR.Cannot_specify_test_without_match), element); regex = null; pat = null; } else { try { regex = new DelayedRegex(matchpat); } catch (Exception e) { throw new ConfigurationErrorsException(e.Message, e, element); } if (testpat == null) pat = CapabilitiesPattern.Default; else pat = new CapabilitiesPattern(testpat); } // grab contents ArrayList subrules = RuleListFromElement(parseState, element, false); return new CapabilitiesSection(ruletype, regex, pat, subrules); } // // Create a rulelist from an element's children // static ArrayList RuleListFromElement(ParseState parseState, XmlNode node, bool top) { ArrayList result = new ArrayList(); foreach (XmlNode child in node.ChildNodes) { switch (child.NodeType) { case XmlNodeType.Text: case XmlNodeType.CDATA: top = false; AppendLines(result, child.Value, node); break; case XmlNodeType.Element: switch (child.Name) { case "result": if (top) { ProcessResult(parseState.Evaluator, child); } else { throw new ConfigurationErrorsException( SR.GetString(SR.Result_must_be_at_the_top_browser_section), child); } break; case "file": if (parseState.IsExternalFile) { throw new ConfigurationErrorsException( SR.GetString(SR.File_element_only_valid_in_config), child); } ProcessFile(parseState.FileList, child); break; default: result.Add(RuleFromElement(parseState, child)); break; } top = false; break; case XmlNodeType.Comment: case XmlNodeType.Whitespace: break; default: HandlerBase.ThrowUnrecognizedElement(child); break; } } return result; } // // Handleelements // static void ProcessFile(ArrayList fileList, XmlNode node) { string filename = null; XmlNode attr = HandlerBase.GetAndRemoveRequiredStringAttribute(node, "src", ref filename); HandlerBase.CheckForUnrecognizedAttributes(node); HandlerBase.CheckForNonCommentChildNodes(node); fileList.Add(new Pair(filename, attr)); } // // Handle the tag // static void ProcessResult(HttpCapabilitiesEvaluator capabilitiesEvaluator, XmlNode node) { bool inherit = true; HandlerBase.GetAndRemoveBooleanAttribute(node, "inherit", ref inherit); if (inherit == false) { capabilitiesEvaluator.ClearParent(); } Type resultType = null; XmlNode attribute = HandlerBase.GetAndRemoveTypeAttribute(node, "type", ref resultType); if (attribute != null) { if (resultType.Equals(capabilitiesEvaluator._resultType) == false) { // be sure the new type is assignable to the parent type HandlerBase.CheckAssignableType(attribute, capabilitiesEvaluator._resultType, resultType); capabilitiesEvaluator._resultType = resultType; } } int cacheTime = 0; attribute = HandlerBase.GetAndRemovePositiveIntegerAttribute(node, "cacheTime", ref cacheTime); //NOTE: we continue to parse the cacheTime for backwards compat // it has never been used. Customer scenarios don't require this support. if (attribute != null) { capabilitiesEvaluator.SetCacheTime(cacheTime); } HandlerBase.CheckForUnrecognizedAttributes(node); HandlerBase.CheckForNonCommentChildNodes(node); } // // ResolveFiles - parse files referenced with // static void ResolveFiles(ParseState parseState, object configurationContext) { // // 1) get the directory of the configuration file currently being parsed // HttpConfigurationContext httpConfigurationContext = (HttpConfigurationContext) configurationContext; string configurationDirectory = null; bool useAssert = false; // // Only assert to read cap files when parsing machine.config // (allow device updates to work in restricted trust levels). // // Machine.config can be securely identified by the context being // an HttpConfigurationContext with null path. // try { if (httpConfigurationContext.VirtualPath == null) { useAssert = true; // we need to assert here to get the file path from ConfigurationException FileIOPermission fiop = new FileIOPermission(PermissionState.None); fiop.AllFiles = FileIOPermissionAccess.PathDiscovery; fiop.Assert(); } Pair pair0 = (Pair)parseState.FileList[0]; XmlNode srcAttribute = (XmlNode)pair0.Second; configurationDirectory = Path.GetDirectoryName(ConfigurationErrorsException.GetFilename(srcAttribute)); } finally { if (useAssert) { CodeAccessPermission.RevertAssert(); } } // // 2) iterate through list of referenced files, builing rule lists for each // foreach (Pair pair in parseState.FileList) { string srcFilename = (string)pair.First; string fullFilename = Path.Combine(configurationDirectory, srcFilename); XmlNode section; try { if (useAssert) { InternalSecurityPermissions.FileReadAccess(fullFilename).Assert(); } Exception fcmException = null; try { HttpConfigurationSystem.AddFileDependency(fullFilename); } catch (Exception e) { fcmException = e; } ConfigXmlDocument configDoc = new ConfigXmlDocument(); try { configDoc.Load(fullFilename); section = configDoc.DocumentElement; } catch (Exception e) { throw new ConfigurationErrorsException(SR.GetString(SR.Error_loading_XML_file, fullFilename, e.Message), e, (XmlNode)pair.Second); } if (fcmException != null) { throw fcmException; } } finally { if (useAssert) { // Cannot apply next FileReadAccess PermissionSet unless // current set is explicitly reverted. Also minimizes // granted permissions. CodeAccessPermission.RevertAssert(); } } if (section.Name != parseState.SectionName) { throw new ConfigurationErrorsException(SR.GetString(SR.Capability_file_root_element, parseState.SectionName), section); } HandlerBase.CheckForUnrecognizedAttributes(section); ArrayList sublist = RuleListFromElement(parseState, section, true); if (sublist.Count > 0) { parseState.RuleList.Add(new CapabilitiesSection(CapabilitiesRule.Filter, null, null, sublist)); } } } // // Regex dealing with a=b lines // static Regex lineRegex = new Regex ( "\\G" + // anchored "(?\\w+)" + // variable name "\\s*=\\s*" + // equals sign "(?:" + "\"(? [^\"\r\n\\\\]*" + // quoted pattern "(?:\\\\.[^\"\r\n\\\\]*)*)\"" + "|(?!\")(? \\S+)" + // unquoted pattern ")" + "\\s*" // trailing whitespace ); static Regex wsRegex = new Regex("\\G\\s*"); static Regex errRegex = new Regex("\\G\\S {0,8}"); static void AppendLines(ArrayList setlist, String text, XmlNode node) { int lineNumber = ConfigurationErrorsException.GetLineNumber(node); int textpos; textpos = 0; for (;;) { Match match; if ((match = wsRegex.Match(text, textpos)).Success) { lineNumber += System.Web.UI.Util.LineCount(text, textpos, match.Index + match.Length); textpos = match.Index + match.Length; } if (textpos == text.Length) break; if ((match = lineRegex.Match(text, textpos)).Success) { setlist.Add(new CapabilitiesAssignment(match.Groups["var"].Value, new CapabilitiesPattern(match.Groups["pat"].Value))); lineNumber += System.Web.UI.Util.LineCount(text, textpos, match.Index + match.Length); textpos = match.Index + match.Length; } else { match = errRegex.Match(text, textpos); throw new ConfigurationErrorsException( SR.GetString(SR.Problem_reading_caps_config, match.ToString()), ConfigurationErrorsException.GetFilename(node), lineNumber); } } } } }
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