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using System;
using System.Collections.Generic;
using System.Linq;
using BlogEngine.Core.Providers;
using System.Web;
using System.Web.Hosting;
using System.IO;
using System.Text.RegularExpressions;
using System.Net;
using BlogEngine.Core.Providers.CacheProvider;
namespace BlogEngine.Core
{
/// <summary>
/// Represents a blog instance.
/// </summary>
public class Blog : BusinessBase<Blog, Guid>, IComparable<Blog>
{
/// <summary>
/// Whether the blog is deleted.
/// </summary>
private bool isDeleted;
/// <summary>
/// Blog name
/// </summary>
private string blogName;
/// <summary>
/// Whether the blog is the primary blog instance
/// </summary>
private bool isPrimary;
/// <summary>
/// Whether the blog is active
/// </summary>
private bool isActive;
/// <summary>
/// The hostname of the blog instance.
/// </summary>
private string hostname;
/// <summary>
/// Whether any text before the hostname is accepted.
/// </summary>
private bool isAnyTextBeforeHostnameAccepted;
/// <summary>
/// The storage container name of the blog's data
/// </summary>
private string storageContainerName;
/// <summary>
/// The virtual path to the blog instance
/// </summary>
private string virtualPath;
/// <summary>
/// The relative web root.
/// </summary>
private string relativeWebRoot;
/// <summary>
/// Whether this blog instance is an aggregration of data across all blog instances.
/// </summary>
private bool isSiteAggregation;
/// <summary>
/// The sync root.
/// </summary>
private static readonly object SyncRoot = new object();
/// <summary>
/// The blogs.
/// </summary>
private static List<Blog> blogs;
/// <summary>
/// Gets or sets a value indicating whether or not the blog is deleted.
/// </summary>
public bool IsDeleted
{
get
{
return this.isDeleted;
}
set
{
base.SetValue("IsDeleted", value, ref this.isDeleted);
}
}
/// <summary>
/// Gets whether the blog is the primary blog instance.
/// </summary>
public bool IsPrimary
{
get
{
return this.isPrimary;
}
internal set
{
// SetAsPrimaryInstance() exists as a public method to make
// a blog instance be the primary one -- which makes sure other
// instances are no longer primary.
base.SetValue("IsPrimary", value, ref this.isPrimary);
}
}
/// <summary>
/// Gets whether this blog instance is an aggregration of data across all blog instances.
/// </summary>
public bool IsSiteAggregation
{
get
{
return this.isSiteAggregation;
}
set
{
base.SetValue("IsSiteAggregation", value, ref this.isSiteAggregation);
}
}
/// <summary>
/// Gets whether the blog instance is active.
/// </summary>
public bool IsActive
{
get
{
return this.isActive;
}
set
{
base.SetValue("IsActive", value, ref this.isActive);
}
}
/// <summary>
/// Gets the optional hostname of the blog instance.
/// </summary>
public string Hostname
{
get
{
return this.hostname;
}
set
{
base.SetValue("Hostname", value, ref this.hostname);
}
}
/// <summary>
/// Gets whether any text before the hostname is accepted.
/// </summary>
public bool IsAnyTextBeforeHostnameAccepted
{
get
{
return this.isAnyTextBeforeHostnameAccepted;
}
set
{
base.SetValue("IsAnyTextBeforeHostnameAccepted", value, ref this.isAnyTextBeforeHostnameAccepted);
}
}
/// <summary>
/// Gets or sets the blog name.
/// </summary>
public string Name
{
get
{
return this.blogName;
}
set
{
base.SetValue("Name", value, ref this.blogName);
}
}
/// <summary>
/// Gets or sets the storage container name.
/// </summary>
public string StorageContainerName
{
get
{
return this.storageContainerName;
}
set
{
base.SetValue("StorageContainerName", value, ref this.storageContainerName);
}
}
/// <summary>
/// Gets or sets the virtual path to the blog instance.
/// </summary>
public string VirtualPath
{
get
{
return this.virtualPath;
}
set
{
// RelativeWebRoot is based on VirtualPath. Clear relativeWebRoot
// so RelativeWebRoot is re-generated.
this.relativeWebRoot = null;
base.SetValue("VirtualPath", value, ref this.virtualPath);
}
}
/// <summary>
/// Gets or sets the unique Identification of the blog instance.
/// </summary>
public override Guid Id
{
get { return base.Id; }
set
{
base.Id = value;
base.BlogId = value;
}
}
/// <summary>
/// Returns true if the blog resides in a subfolder of the application root directory;
/// false otherwise.
/// </summary>
public bool IsSubfolderOfApplicationWebRoot
{
get
{
return this.RelativeWebRoot.Length > Utils.ApplicationRelativeWebRoot.Length;
}
}
/// <summary>
/// Attempts to delete the current Blog.
/// </summary>
public override void Delete()
{
if (this.IsPrimary)
{
throw new Exception("The primary blog cannot be deleted.");
}
base.Delete();
}
/// <summary>
/// Deletes the Blog from the current BlogProvider.
/// </summary>
protected override void DataDelete()
{
OnSaving(this, SaveAction.Delete);
if (this.Deleted)
{
BlogService.DeleteBlogStorageContainer(this);
BlogService.DeleteBlog(this);
}
Blogs.Remove(this);
SortBlogs();
OnSaved(this, SaveAction.Delete);
this.Dispose();
}
/// <summary>
/// Inserts a new blog to the current BlogProvider.
/// </summary>
protected override void DataInsert()
{
OnSaving(this, SaveAction.Insert);
if (this.New)
{
BlogService.InsertBlog(this);
}
Blogs.Add(this);
SortBlogs();
OnSaved(this, SaveAction.Insert);
}
/// <summary>
/// Updates the object in its data store.
/// </summary>
protected override void DataUpdate()
{
OnSaving(this, SaveAction.Update);
if (this.IsChanged)
{
BlogService.UpdateBlog(this);
SortBlogs();
}
OnSaved(this, SaveAction.Update);
}
/// <summary>
/// Retrieves the object from the data store and populates it.
/// </summary>
/// <param name="id">
/// The unique identifier of the object.
/// </param>
/// <returns>
/// The object that was selected from the data store.
/// </returns>
protected override Blog DataSelect(Guid id)
{
return BlogService.SelectBlog(id);
}
/// <summary>
/// Reinforces the business rules by adding additional rules to the
/// broken rules collection.
/// </summary>
protected override void ValidationRules()
{
this.AddRule("Name", "Name must be set", string.IsNullOrEmpty(this.Name));
}
/// <summary>
/// Gets whether the current user can delete this object.
/// </summary>
public override bool CanUserDelete
{
get
{
return Security.IsAdministrator && !this.IsPrimary;
}
}
/// <summary>
/// Sets the current Blog instance as the primary.
/// </summary>
public void SetAsPrimaryInstance()
{
for (int i = 0; i < Blogs.Count; i++)
{
// Ensure other blogs are not marked as primary.
if (Blogs[i].Id != this.Id && Blogs[i].IsPrimary)
{
Blogs[i].IsPrimary = false;
Blogs[i].Save();
}
else if (Blogs[i].Id == this.Id)
{
Blogs[i].IsPrimary = true;
Blogs[i].Save();
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref = "Blog" /> class.
/// The default contstructor assign default values.
/// </summary>
public Blog()
{
this.Id = Guid.NewGuid();
this.BlogId = this.Id;
this.DateCreated = DateTime.Now;
this.DateModified = DateTime.Now;
}
/// <summary>
/// Gets all blogs.
/// </summary>
public static List<Blog> Blogs
{
get
{
if (blogs == null)
{
lock (SyncRoot)
{
if (blogs == null)
{
blogs = BlogService.FillBlogs().ToList();
if (blogs.Count == 0)
{
// create the primary instance
Blog blog = new Blog();
blog.Name = "Primary";
blog.hostname = string.Empty;
blog.VirtualPath = BlogConfig.VirtualPath;
blog.StorageContainerName = string.Empty;
blog.IsPrimary = true;
blog.IsSiteAggregation = false;
blog.Save();
}
SortBlogs();
}
}
}
return blogs;
}
}
private static void SortBlogs()
{
blogs.Sort();
}
/// <summary>
/// Marked as ThreadStatic so each thread has its own value.
/// Need to be careful with this since when using ThreadPool.QueueUserWorkItem,
/// after a thread is used, it is returned to the thread pool and
/// any ThreadStatic values (such as this field) are not cleared, they will persist.
///
/// This value is reset in WwwSubdomainModule.BeginRequest.
///
/// </summary>
[ThreadStatic]
private static Guid _InstanceIdOverride;
/// <summary>
/// This is a thread-specific Blog Instance ID to override.
/// If the current blog instance needs to be overridden,
/// this property can be used. A typical use for this is when
/// using BG/async threads where the current blog instance
/// cannot be determined since HttpContext will be null.
/// </summary>
public static Guid InstanceIdOverride
{
get { return _InstanceIdOverride; }
set { _InstanceIdOverride = value; }
}
/// <summary>
/// The current blog instance.
/// </summary>
public static Blog CurrentInstance
{
get
{
if (_InstanceIdOverride != Guid.Empty)
{
Blog overrideBlog = Blogs.FirstOrDefault(b => b.Id == _InstanceIdOverride);
if (overrideBlog != null)
{
return overrideBlog;
}
}
const string CONTEXT_ITEM_KEY = "current-blog-instance";
HttpContext context = HttpContext.Current;
Blog blog = context.Items[CONTEXT_ITEM_KEY] as Blog;
if (blog != null) { return blog; }
List<Blog> blogs = Blogs;
if (blogs.Count == 0) { return null; }
if (blogs.Count == 1)
{
blog = blogs[0];
}
else
{
// Determine which blog.
//
// Web service and Page method calls to the server need to be made to the
// root level, and cannot be virtual URLs that get rewritten to the correct
// physical location. When attempting to rewrite these URLs, the web
// service/page method will throw a "405 Method Not Allowed" error.
// For us to determine which blog these AJAX calls are on behalf of,
// a request header on the AJAX calls will be appended to tell us which
// blog instance they are for.
//
// The built-in ASP.NET Callback system works correctly even when
// the URL is rewritten. For these, CurrentInstance will be determined
// and stored in HttpContext.Items before the rewrite is done -- so even
// after the rewrite, CurrentInstance will reference the correct blog
// instance.
//
string blogIdHeader = context.Request.Headers["x-blog-instance"];
if (!string.IsNullOrWhiteSpace(blogIdHeader) && blogIdHeader.Length == 36)
{
blog = GetBlog(new Guid(blogIdHeader));
if (blog != null && !blog.IsActive)
blog = null;
}
if (blog == null)
{
// Note, this.Blogs is sorted via SortBlogs() so the blogs with longer
// RelativeWebRoots come first. This is important when matching so the
// more specific matches are done first.
// for the purposes here, adding a trailing slash to RawUrl, even if it's not
// a correct URL. if a blog has a relative root of /blog1, RelativeWebRoot
// will be /blog1/ (containing the trailing slash). for equal comparisons,
// make sure rawUrl also has a trailing slash.
string rawUrl = VirtualPathUtility.AppendTrailingSlash(context.Request.RawUrl);
string hostname = context.Request.Url.Host;
for (int i = 0; i < blogs.Count; i++)
{
Blog checkBlog = blogs[i];
if (checkBlog.isActive)
{
// first check the hostname, if a hostname is specified
if (!string.IsNullOrWhiteSpace(checkBlog.hostname))
{
bool isMatch = false;
if (checkBlog.IsAnyTextBeforeHostnameAccepted)
isMatch = hostname.EndsWith(checkBlog.hostname, StringComparison.OrdinalIgnoreCase);
else
isMatch = hostname.Equals(checkBlog.hostname, StringComparison.OrdinalIgnoreCase);
// if isMatch, we still need to check the conditions below, to allow
// multiple path variations for a particular hostname.
if (!isMatch)
{
continue;
}
}
// second check the path.
if (rawUrl.StartsWith(checkBlog.RelativeWebRoot, StringComparison.OrdinalIgnoreCase))
{
blog = checkBlog;
break;
}
}
}
// if all blogs are inactive, or there are no matches for some reason,
// select the primary blog.
if (blog == null)
{
blog = blogs.FirstOrDefault(b => b.IsPrimary);
}
}
}
context.Items[CONTEXT_ITEM_KEY] = blog;
return blog;
}
}
/// <summary>
/// Returns a blog based on the specified id.
/// </summary>
/// <param name="id">
/// The blog id.
/// </param>
/// <returns>
/// The selected blog.
/// </returns>
public static Blog GetBlog(Guid id)
{
return Blogs.Find(b => b.Id == id);
}
/// <summary>
/// Returns the site aggregation blog instance, if one exists.
/// </summary>
/// <returns>
/// The site aggregation blog instance, if one exists.
/// </returns>
public static Blog SiteAggregationBlog
{
get
{
return Blogs.Find(b => b.IsSiteAggregation);
}
}
/// <summary>
/// Gets whether the hostname differs from the Site Aggreation blog.
/// </summary>
public bool DoesHostnameDifferFromSiteAggregationBlog
{
get
{
if (this.IsSiteAggregation)
return false;
Blog siteAggregationBlog = SiteAggregationBlog;
if (siteAggregationBlog == null)
return false;
return siteAggregationBlog.Hostname != this.Hostname;
}
}
/// <summary>
/// Gets a mappable virtual path to the blog instance's storage folder.
/// </summary>
public string StorageLocation
{
get
{
// only the Primary blog instance should have an empty StorageContainerName
if (string.IsNullOrWhiteSpace(this.StorageContainerName))
{
return BlogConfig.StorageLocation;
}
return $"{BlogConfig.StorageLocation}{BlogConfig.BlogInstancesFolderName}/{StorageContainerName}/";
}
}
/// <summary>
/// the root file storage directory for the blog. All File system management should start from the Root file store
/// </summary>
public FileSystem.Directory RootFileStore
{
get
{
return BlogService.GetDirectory(string.Concat(this.StorageLocation, Utils.FilesFolder));
}
}
/// <summary>
/// Gets the relative root of the blog instance.
/// </summary>
/// <value>A string that ends with a '/'.</value>
public string RelativeWebRoot
{
get
{
return relativeWebRoot ??
(relativeWebRoot =
VirtualPathUtility.ToAbsolute(VirtualPathUtility.AppendTrailingSlash(this.VirtualPath ?? BlogConfig.VirtualPath)));
}
}
/// <summary>
/// Gets the "authority" portion of the absolute web root.
/// </summary>
public string AbsoluteWebRootAuthority
{
get
{
return AbsoluteWebRoot.GetLeftPart(UriPartial.Authority);
}
}
/// <summary>
/// Gets the absolute root of the blog instance.
/// </summary>
public Uri AbsoluteWebRoot
{
get
{
string contextItemKey = $"{Id}-absolutewebroot";
var context = HttpContext.Current;
if (context == null)
{
throw new WebException("The current HttpContext is null");
}
Uri absoluteWebRoot = context.Items[contextItemKey] as Uri;
if (absoluteWebRoot != null) { return absoluteWebRoot; }
UriBuilder uri = new UriBuilder();
if (!string.IsNullOrWhiteSpace(this.Hostname))
uri.Host = this.Hostname;
else
{
uri.Host = context.Request.Url.Host;
if (!context.Request.Url.IsDefaultPort)
{
uri.Port = context.Request.Url.Port;
}
}
uri.Path = RelativeWebRoot;
uri.Scheme = context.Request.Url.Scheme; // added for https support
absoluteWebRoot = uri.Uri;
context.Items[contextItemKey] = absoluteWebRoot;
return absoluteWebRoot;
}
}
/// <summary>
/// Creates a new blog.
/// </summary>
public static Blog CreateNewBlog(
string copyFromExistingBlogId,
string blogName,
string hostname,
bool isAnyTextBeforeHostnameAccepted,
string storageContainerName,
string virtualPath,
bool isActive,
bool isSiteAggregation,
out string message)
{
message = null;
if (!ValidateProperties(true, null, blogName, hostname, isAnyTextBeforeHostnameAccepted, storageContainerName, virtualPath, isSiteAggregation, out message))
{
if (string.IsNullOrWhiteSpace(message))
{
message = "Validation for new blog failed.";
}
return null;
}
if (string.IsNullOrWhiteSpace(copyFromExistingBlogId) || copyFromExistingBlogId.Length != 36)
{
message = "An existing blog instance ID must be specified to create the new blog from.";
return null;
}
Blog existingBlog = Blog.GetBlog(new Guid(copyFromExistingBlogId));
if (existingBlog == null)
{
message = "The existing blog instance to create the new blog from could not be found.";
return null;
}
Blog newBlog = new Blog()
{
Name = blogName,
StorageContainerName = storageContainerName,
Hostname = hostname,
IsAnyTextBeforeHostnameAccepted = isAnyTextBeforeHostnameAccepted,
VirtualPath = virtualPath,
IsActive = isActive,
IsSiteAggregation = isSiteAggregation
};
bool setupResult = false;
try
{
setupResult = newBlog.SetupFromExistingBlog(existingBlog);
}
catch (Exception ex)
{
Utils.Log("Blog.CreateNewBlog", ex);
message = "Failed to create new blog. Error: " + ex.Message;
return null;
}
if (!setupResult)
{
message = "Failed during process of setting up the blog from the existing blog instance.";
return null;
}
// save the blog for the first time.
newBlog.Save();
return newBlog;
}
/// <summary>
/// Validates the blog properties.
/// </summary>
public static bool ValidateProperties(
bool isNew,
Blog updateBlog,
string blogName,
string hostname,
bool isAnyTextBeforeHostnameAccepted,
string storageContainerName,
string virtualPath,
bool isSiteAggregation,
out string message)
{
message = null;
if (string.IsNullOrWhiteSpace(blogName))
{
message = "Blog Name is Required.";
return false;
}
if (!string.IsNullOrWhiteSpace(hostname))
{
if (!Utils.IsHostnameValid(hostname) &&
!Utils.IsIpV4AddressValid(hostname) &&
!Utils.IsIpV6AddressValid(hostname))
{
message = "Invalid Hostname. Hostname must be an IP address or domain name.";
return false;
}
}
Regex validChars = new Regex("^[a-z0-9-_]+$", RegexOptions.IgnoreCase);
// if primary is being edited, allow an empty storage container name (bypass check).
if (updateBlog == null || !updateBlog.IsPrimary)
{
if (string.IsNullOrWhiteSpace(storageContainerName))
{
message = "Storage Container Name is Required.";
return false;
}
}
if (!string.IsNullOrWhiteSpace(storageContainerName) && !validChars.IsMatch(storageContainerName))
{
message = "Storage Container Name contains invalid characters.";
return false;
}
if (string.IsNullOrWhiteSpace(virtualPath))
{
message = "Virtual Path is Required.";
return false;
}
else
{
if (!virtualPath.StartsWith("~/"))
{
message = "Virtual Path must begin with ~/";
return false;
}
// note: a virtual path of ~/ without anything after it is allowed. this would
// typically be for the primary blog, but can also be for blogs that are using
// subdomains, where each instance might be ~/
string vPath = virtualPath.Substring(2);
if (vPath.Length > 0)
{
if (!validChars.IsMatch(vPath))
{
message = "The Virtual Path contains invalid characters after the ~/";
return false;
}
}
}
if (isSiteAggregation)
{
Blog siteAggregationBlog = Blog.SiteAggregationBlog;
if ((updateBlog == null && siteAggregationBlog != null) || (updateBlog != null && siteAggregationBlog != null && updateBlog.Id != siteAggregationBlog.Id))
{
message = "Another blog is already marked as being the Site Aggregation blog. Only one blog instance can be the Site Aggregration instance.";
return false;
}
}
if (Blog.Blogs.FirstOrDefault(b => (updateBlog == null || updateBlog.Id != b.Id) && (b.VirtualPath ?? string.Empty).Equals((virtualPath ?? string.Empty), StringComparison.OrdinalIgnoreCase) && (b.Hostname ?? string.Empty).Equals(hostname ?? string.Empty, StringComparison.OrdinalIgnoreCase)) != null)
{
message = "Another blog has the same combination of Hostname and Virtual Path.";
return false;
}
return true;
}
/// <summary>
/// Sets up the blog instance using the files and settings from an existing blog instance.
/// </summary>
/// <param name="existing">The existing blog instance to use files and settings from.</param>
/// <returns></returns>
public bool SetupFromExistingBlog(Blog existing)
{
if (existing == null)
throw new ArgumentException("existing");
if (string.IsNullOrWhiteSpace(this.StorageContainerName))
throw new ArgumentException("this.StorageContainerName");
// allow the blog provider to setup the necessary blog files, etc.
bool providerResult = BlogService.SetupBlogFromExistingBlog(existing, this);
if (!providerResult)
return false;
//if (Membership.Provider.Name.Equals("DbMembershipProvider", StringComparison.OrdinalIgnoreCase))
//{
//}
//if (Roles.Provider.Name.Equals("DbRoleProvider", StringComparison.OrdinalIgnoreCase))
//{
//}
return true;
}
internal bool DeleteBlogFolder()
{
// This method is called by the blog providers when a blog's storage container
// is being deleted. Even the DbBlogProvider will call this method.
// However, a different type of blog provider (e.g. Azure, etc) may not
// need to call this method.
try
{
string storagePath = HostingEnvironment.MapPath(this.StorageLocation);
if (Directory.Exists(storagePath))
{
Directory.Delete(storagePath, true);
}
}
catch (Exception ex)
{
Utils.Log("Blog.DeleteBlogFolder", ex);
return false;
}
return true;
}
internal bool CopyExistingBlogFolderToNewBlogFolder(Blog existingBlog)
{
// This method is called by the blog providers when a new blog is being setup.
// Even the DbBlogProvider will call this method. However, a different type of
// blog provider (e.g. Azure, etc) may not need to call this method.
if (string.IsNullOrWhiteSpace(this.StorageContainerName))
throw new ArgumentException("this.StorageContainerName");
string existingBlogStoragePath = null;
try
{
// Ensure the existing blog storage path exists.
existingBlogStoragePath = HostingEnvironment.MapPath(existingBlog.StorageLocation);
if (!Directory.Exists(existingBlogStoragePath))
{
throw new Exception($"Storage folder for existing blog instance to copy from does not exist. Directory not found is: {existingBlogStoragePath}");
}
}
catch (Exception ex)
{
Utils.Log("Blog.CreateNewBlogFromExisting", ex);
throw; // re-throw error so error message bubbles up.
}
// Ensure "BlogInstancesFolderName" exists.
string blogInstancesFolder = HostingEnvironment.MapPath($"{BlogConfig.StorageLocation}{BlogConfig.BlogInstancesFolderName}");
if (!Utils.CreateDirectoryIfNotExists(blogInstancesFolder))
return false;
// If newBlogStoragePath already exists, throw an exception as this may be a mistake
// and we don't want to overwrite any existing data.
string newBlogStoragePath = HostingEnvironment.MapPath(this.StorageLocation);
try
{
if (Directory.Exists(newBlogStoragePath))
{
throw new Exception($"Blog destination folder already exists. {newBlogStoragePath}");
}
}
catch (Exception ex)
{
Utils.Log("Blog.CopyExistingBlogFolderToNewBlogFolder", ex);
throw; // re-throw error so error message bubbles up.
}
if (!Utils.CreateDirectoryIfNotExists(newBlogStoragePath))
return false;
// Copy the entire directory contents.
DirectoryInfo source = new DirectoryInfo(existingBlogStoragePath);
DirectoryInfo target = new DirectoryInfo(newBlogStoragePath);
try
{
// if the primary blog directly in App_Data is the 'source', when all the directories/files are
// being copied to the new location, we don't want to copy the entire BlogInstancesFolderName
// (by default ~/App_Data/blogs) to the new location. Everything except for that can be copied.
// If the 'source' is a blog instance under ~/App_Data/blogs (e.g. ~/App_Data/blogs/template),
// then this is not a concern.