Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Configuration / UriSectionReader.cs / 1305376 / UriSectionReader.cs
using System; using System.Collections.Generic; using System.Text; using System.Net; using System.Security.Permissions; using System.IO; using System.Xml; using System.Security; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; namespace System.Configuration { // This class is used to read thesection from a config file directly, without using System.Configuration internal class UriSectionReader { private const string rootElementName = "configuration"; private string configFilePath; private XmlReader reader; // result data after parsing the configuration section private UriSectionData sectionData; private UriSectionReader(string configFilePath, UriSectionData parentData) { Debug.Assert(configFilePath != null, "'configFilePath' must not be null"); this.configFilePath = configFilePath; this.sectionData = new UriSectionData(); if (parentData != null) { sectionData.IriParsing = parentData.IriParsing; sectionData.IdnScope = parentData.IdnScope; foreach (KeyValuePair schemeSetting in parentData.SchemeSettings) { sectionData.SchemeSettings.Add(schemeSetting.Key, schemeSetting.Value); } } } public static UriSectionData Read(string configFilePath) { return Read(configFilePath, null); } public static UriSectionData Read(string configFilePath, UriSectionData parentData) { UriSectionReader reader = new UriSectionReader(configFilePath, parentData); return reader.GetSectionData(); } [SuppressMessage("Microsoft.Security","CA2106:SecureAsserts", Justification="Must Assert read permission for only this file")] [SuppressMessage("Microsoft.Security","CA2103:ReviewImperativeSecurity", Justification="Must Assert read permission for only this file")] private UriSectionData GetSectionData() { // Assert read permission for only this file. new FileIOPermission(FileIOPermissionAccess.Read, configFilePath).Assert(); try { if (File.Exists(configFilePath)) { using (FileStream configFile = new FileStream(configFilePath, FileMode.Open, FileAccess.Read)) { XmlReaderSettings settings = new XmlReaderSettings(); settings.IgnoreComments = true; settings.IgnoreWhitespace = true; settings.IgnoreProcessingInstructions = true; using (reader = XmlReader.Create(configFile, settings)) { if (ReadConfiguration()) { return sectionData; } } } } } catch (Exception) { // In this case we really want to catch all exceptions: Uri never threw, therefore we can't // start throwing exceptions now when reading the configuration. } finally { FileIOPermission.RevertAssert(); } return null; } private bool ReadConfiguration() { if (!ReadToUriSection()) { return false; } while (reader.Read()) { if (IsEndElement(CommonConfigurationStrings.UriSectionName)) { return true; } if (reader.NodeType != XmlNodeType.Element) { return false; } string currentElementName = reader.Name; if (AreEqual(currentElementName, CommonConfigurationStrings.IriParsing)) { if (ReadIriParsing()) { continue; } } else if (AreEqual(currentElementName, CommonConfigurationStrings.Idn)) { if (ReadIdnScope()) { continue; } } else if (AreEqual(currentElementName, CommonConfigurationStrings.SchemeSettings)) { if (ReadSchemeSettings()) { continue; } } // we found an unknown element in section. return false; } // we reached EOF, but the will end up here. return false; } // reached EOF without hitting return false; } private static bool AreEqual(string value1, string value2) { return string.Compare(value1, value2, StringComparison.OrdinalIgnoreCase) == 0; } private bool ReadAddSchemeSetting() { string schemeValue = reader.GetAttribute(CommonConfigurationStrings.SchemeName); string genericUriParserOptionsValue = reader.GetAttribute( CommonConfigurationStrings.GenericUriParserOptions); if (string.IsNullOrEmpty(schemeValue) || string.IsNullOrEmpty(genericUriParserOptionsValue)) { return false; } try { GenericUriParserOptions genericUriParserOptions = (GenericUriParserOptions)Enum.Parse( typeof(GenericUriParserOptions), genericUriParserOptionsValue); SchemeSettingInternal schemeSetting = new SchemeSettingInternal(schemeValue, genericUriParserOptions); sectionData.SchemeSettings[schemeSetting.Name] = schemeSetting; return true; } catch (ArgumentException) { return false; } } private bool ReadRemoveSchemeSetting() { string scheme = reader.GetAttribute(CommonConfigurationStrings.SchemeName); if (string.IsNullOrEmpty(scheme)) { return false; } // ignore result value. It's ok if the scheme is not in the collection. sectionData.SchemeSettings.Remove(scheme); return true; } private void ClearSchemeSetting() { // no attributes to read, just clear collection sectionData.SchemeSettings.Clear(); } private bool IsEndElement(string elementName) { return (reader.NodeType == XmlNodeType.EndElement) && string.Compare(reader.Name, elementName, StringComparison.OrdinalIgnoreCase) == 0; } private bool ReadToUriSection() { if (!reader.ReadToFollowing(rootElementName)) { return false; } if (reader.Depth != 0) { // 'configuration' must be the root element. If not, this is not a valid config file. return false; } // To be entirely correct, we should not look fornode didn't have a final node return false; } private bool ReadIriParsing() { string attributeValue = reader.GetAttribute(CommonConfigurationStrings.Enabled); bool configIriParsingValue; if (bool.TryParse(attributeValue, out configIriParsingValue)) { sectionData.IriParsing = configIriParsingValue; return true; } else { return false; } } private bool ReadIdnScope() { string attributeValue = reader.GetAttribute(CommonConfigurationStrings.Enabled); try { sectionData.IdnScope = (UriIdnScope)Enum.Parse(typeof(UriIdnScope), attributeValue, true); return true; } catch (ArgumentException) { return false; } } private bool ReadSchemeSettings() { while (reader.Read()) { if (IsEndElement(CommonConfigurationStrings.SchemeSettings)) { return true; } if (reader.NodeType != XmlNodeType.Element) { return false; } string currentElementName = reader.Name; if (AreEqual(currentElementName, SchemeSettingElementCollection.AddItemName)) { if (ReadAddSchemeSetting()) { continue; } } else if (AreEqual(currentElementName, SchemeSettingElementCollection.RemoveItemName)) { if (ReadRemoveSchemeSetting()) { continue; } } else if (AreEqual(currentElementName, SchemeSettingElementCollection.ClearItemsName)) { ClearSchemeSetting(); continue; } // unknown element found, e.g. if is missing, readingsection, but we should look for the name // specified in the / node for type 'System.Configuration.Uri'. // An admin/user can decide to rename the uri section to whatever he wants. However, since // all NCL (and some other) configuration implementations look for the hard-coded string, // we don't change the current behavior. do { // 'uri' must be at depth 1, otherwise it is not our section, but a custom one. if (!reader.ReadToFollowing(CommonConfigurationStrings.UriSectionName)) { return false; } } while (reader.Depth != 1); return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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