RemoteWebConfigurationHostServer.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Configuration / RemoteWebConfigurationHostServer.cs / 4 / RemoteWebConfigurationHostServer.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Configuration { 
    using System.Collections; 
    using System.Configuration;
    using System.Security; 
    using System.IO;
    using System.Globalization;
    using System.Text;
    using System.Runtime.InteropServices; 
    using System.Reflection;
    using System.Web.Util; 
    using System.Collections.Specialized; 
    using System.Xml;
    using System.Security.Cryptography; 
#if !FEATURE_PAL // FEATURE_PAL does not enable access control
    using System.Security.AccessControl;
#endif // !FEATURE_PAL
    using System.Security.Permissions; 

 
#if !FEATURE_PAL // FEATURE_PAL does not enable COM 
    [ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual),
#if WIN64 
    Guid("CE6ED9D0-3BF2-4243-B0AB-919BAC47542B"),  ProgId("System.Web.Configuration.RemoteWebConfigurationHostServer_64")]
#else
    Guid("8DEC0FA2-CC19-494F-8613-1F6221C0C5AB"), ProgId("System.Web.Configuration.RemoteWebConfigurationHostServer_32")]
#endif 

#endif // FEATURE_PAL does not enable COM 
    [SecurityPermission(SecurityAction.Demand, Unrestricted = true)] 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class RemoteWebConfigurationHostServer : IRemoteWebConfigurationHostServer
    {
        internal const char             FilePathsSeparatorChar = '<';
        static internal readonly char[] FilePathsSeparatorParams = new char[] {FilePathsSeparatorChar}; 

        public byte[] GetData(string fileName, bool getReadTimeOnly, out long readTime) 
        { 
            if (!fileName.ToLowerInvariant().EndsWith(".config", StringComparison.Ordinal))
                throw new Exception(SR.GetString(SR.Can_not_access_files_other_than_config)); 

            byte [] buf;
            if (File.Exists(fileName)) {
                if (getReadTimeOnly) { 
                    buf = new byte[0];
                } 
                else { 
                    buf = File.ReadAllBytes(fileName);
                } 
                DateTime lastWrite = File.GetLastWriteTimeUtc(fileName);
                readTime = (DateTime.UtcNow > lastWrite ? DateTime.UtcNow.Ticks : lastWrite.Ticks);
            } else {
                buf = new byte[0]; 
                readTime = DateTime.UtcNow.Ticks;
            } 
            return buf; 
        }
 
        public void WriteData(string fileName, string templateFileName, byte[] data, ref long readTime)
        {
            if (!fileName.ToLowerInvariant().EndsWith(".config", StringComparison.Ordinal))
                throw new Exception(SR.GetString(SR.Can_not_access_files_other_than_config)); 

            bool            fileExists          = File.Exists(fileName); 
            FileInfo        fileInfo            = null; 
            FileAttributes  fileAttributes      = FileAttributes.Normal;
            string          tempFile            = null; 
            Exception       createStreamExcep   = null;
            FileStream      tempFileStream      = null;
            long            lastWriteTicks      = 0;
            long            utcNowTicks         = 0; 

            ///////////////////////////////////////////////////////////////////// 
            // Step 1: If the file exists, then make sure it hasn't been written to since it was read 
            if (fileExists && File.GetLastWriteTimeUtc(fileName).Ticks > readTime) {
                throw new Exception(SR.GetString(SR.File_changed_since_read, fileName)); 
            }

            /////////////////////////////////////////////////////////////////////
            // Step 2: Get the security-descriptor and attributes of the file 
            if (fileExists) {
                try { 
                    fileInfo = new FileInfo(fileName); 
                    fileAttributes = fileInfo.Attributes;
                } catch { } 
                if (((int)(fileAttributes & (FileAttributes.ReadOnly | FileAttributes.Hidden))) != 0)
                    throw new Exception(SR.GetString(SR.File_is_read_only, fileName));
            }
 
            /////////////////////////////////////////////////////////////////////
            // Step 3: Generate a temp file name. Make sure that the temp file doesn't exist 
            tempFile = fileName + "." + GetRandomFileExt() + ".tmp"; 
            for (int iter = 0; File.Exists(tempFile); iter++) { // if it exists, then use a different random name
                if (iter > 100) // don't try more than 100 times 
                    throw new Exception(SR.GetString(SR.Unable_to_create_temp_file));
                else
                    tempFile = fileName + "." + GetRandomFileExt() + ".tmp";
            } 

            ///////////////////////////////////////////////////////////////////// 
            // Step 4: Write the buffer to the temp file, and move it to the actual file 
            try {
                tempFileStream = new FileStream(tempFile, FileMode.CreateNew, FileAccess.Write, FileShare.ReadWrite, data.Length, FileOptions.WriteThrough); 
                tempFileStream.Write(data, 0, data.Length);
            } catch (Exception e) {
                createStreamExcep = e;
            } finally { 
                if (tempFileStream != null)
                    tempFileStream.Close(); 
            } 
            if (createStreamExcep != null) {
                try { 
                    File.Delete(tempFile);
                } catch { }
                throw createStreamExcep;
            } 
            if (fileExists) {
                try { 
                    DuplicateFileAttributes(fileName, tempFile); 
                } catch { }
            } 
            else if ( templateFileName != null ) {
                try {
                    DuplicateTemplateAttributes(fileName, templateFileName);
                } catch { } 
            }
 
            ///////////////////////////////////////////////////////////////////// 
            // Step 4: Move the temp filt to the actual file
            if (!UnsafeNativeMethods.MoveFileEx(tempFile, fileName, MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH)) { 
                try {
                    File.Delete(tempFile);
                } catch { }
                Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); 
            }
 
            ///////////////////////////////////////////////////////////////////// 
            // Step 5: Set the attributes of the file
            if (fileExists) { 
                fileInfo = new FileInfo(fileName);
                fileInfo.Attributes = fileAttributes;
            }
 
            /////////////////////////////////////////////////////////////////////
            // Step 6: Record the current time as the read-time 
            lastWriteTicks = File.GetLastWriteTimeUtc(fileName).Ticks; 
            utcNowTicks = DateTime.UtcNow.Ticks;
            readTime = (utcNowTicks > lastWriteTicks ? utcNowTicks : lastWriteTicks); 
        }

        public string GetFilePaths(int webLevelAsInt, string path, string site, string locationSubPath)
        { 
            WebLevel webLevel = (WebLevel) webLevelAsInt;
 
            IConfigMapPath configMapPath = IISMapPath.GetInstance(); 

            // Get the configuration paths and application information 
            string appSiteName, appSiteID;
            VirtualPath appPath;
            string configPath, locationConfigPath;
            WebConfigurationHost.GetConfigPaths(configMapPath, webLevel, VirtualPath.CreateNonRelativeAllowNull(path), site, locationSubPath, 
                    out appPath, out appSiteName, out appSiteID, out configPath, out locationConfigPath);
 
            // 
            // Format of filePaths:
            //      appPath < appSiteName < appSiteID < configPath < locationConfigPath [< configPath < fileName]+ 
            //
            ArrayList filePaths = new ArrayList();
            filePaths.Add(VirtualPath.GetVirtualPathString(appPath));
            filePaths.Add(appSiteName); 
            filePaths.Add(appSiteID);
            filePaths.Add(configPath); 
            filePaths.Add(locationConfigPath); 

            string dummySiteID; 
            VirtualPath virtualPath;
            WebConfigurationHost.GetSiteIDAndVPathFromConfigPath(configPath, out dummySiteID, out virtualPath);

            // pathmap for machine.config 
            filePaths.Add(WebConfigurationHost.MachineConfigPath);
            filePaths.Add(HttpConfigurationSystem.MachineConfigurationFilePath); 
 
            // pathmap for root web.config
            if (webLevel != WebLevel.Machine) { 
                filePaths.Add(WebConfigurationHost.RootWebConfigPath);
                filePaths.Add(HttpConfigurationSystem.RootWebConfigurationFilePath);

                // pathmap for other paths 
                for (VirtualPath currentVirtualPath = virtualPath; currentVirtualPath != null; currentVirtualPath = currentVirtualPath.Parent)
                { 
                    string currentConfigPath = WebConfigurationHost.GetConfigPathFromSiteIDAndVPath(appSiteID, currentVirtualPath); 
                    string currentFilePath = configMapPath.MapPath(appSiteID, currentVirtualPath.VirtualPathString);
                    currentFilePath = System.IO.Path.Combine(currentFilePath, HttpConfigurationSystem.WebConfigFileName); 

                    filePaths.Add(currentConfigPath);
                    filePaths.Add(currentFilePath);
                } 
            }
 
            // join into a single string 
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < filePaths.Count; i++) { 
                if (i > 0) {
                    sb.Append(FilePathsSeparatorChar);
                }
 
                string part = (string) filePaths[i];
                sb.Append(part); 
            } 

            return sb.ToString(); 
        }

        public string DoEncryptOrDecrypt(bool doEncrypt, string xmlString, string protectionProviderName, string protectionProviderType, string[] paramKeys, string[] paramValues)
        { 
            Type t = Type.GetType(protectionProviderType, true);
            if (!typeof(ProtectedConfigurationProvider).IsAssignableFrom(t)) { 
                throw new Exception(SR.GetString(SR.WrongType_of_Protected_provider)); 
            }
 
            ProtectedConfigurationProvider  provider        = (ProtectedConfigurationProvider)Activator.CreateInstance(t);
            NameValueCollection             cloneParams     = new NameValueCollection(paramKeys.Length);
            XmlNode                         node;
 
            for(int iter=0; iter
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RemoteWebConfigurationHostServer.cs source code in C# .NET

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