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/**
* Namespace: System.Web.UI.Util
* Class: UrlUtils
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Status: ??%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Collections;
using System.Text;
using System.Web.SessionState;
namespace System.Web.Util
{
internal class UrlUtils
{
/*
* I could not find these functions in the class System.Uri
* Besides, an instance of Uri will not be formed until and unless the address is of
* the form protocol://[user:pass]host[:port]/[fullpath]
* ie, a protocol, and that too without any blanks before,
* is a must which may not be the case here.
* Important: Escaped URL is assumed here. nothing like .aspx?path=/something
* It should be .aspx?path=%2Fsomething
*/
public static string GetProtocol(string url)
{
//Taking code from Java Class java.net.URL
if(url!=null)
{
if(url.Length>0)
{
int i, start = 0, limit;
limit = url.Length;
char c;
bool aRef = false;
while( (limit > 0) && (url[limit-1] <= ' '))
{
limit --;
}
while( (start < limit) && (url[start] <= ' '))
{
start++;
}
if(RegionMatches(true, url, start, "url:", 0, 4))
{
start += 4;
}
if(start < url.Length && url[start]=='#')
{
aRef = true;
}
for(i = start; !aRef && (i < limit) && ((c=url[i]) != '/'); i++)
{
if(c==':')
{
return url.Substring(start, i - start);
}
}
}
}
return String.Empty;
}
public static bool IsRelativeUrl(string url)
{
if (url.IndexOf(':') == -1)
return !IsRooted(url);
return false;
}
public static bool IsRootUrl(string url)
{
if(url!=null)
{
if(url.Length>0)
{
return IsValidProtocol(GetProtocol(url).ToLower());
}
}
return true;
}
public static bool IsRooted(string path)
{
if(path!=null && path.Length > 0)
{
return (path[0]=='/' || path[0]=='\\');
}
return true;
}
public static void FailIfPhysicalPath(string path)
{
if(path!= null && path.Length > 1)
{
if(path[1]==':' || path.StartsWith(@"\\"))
throw new HttpException(HttpRuntime.FormatResourceString("Physical_path_not_allowed", path));
}
}
public static string Combine (string basePath, string relPath)
{
if (relPath == null)
throw new ArgumentNullException ("relPath");
int rlength = relPath.Length;
if (rlength == 0)
return "";
FailIfPhysicalPath (relPath);
relPath = relPath.Replace ("\\", "/");
if (IsRooted (relPath))
return Reduce (relPath);
char first = relPath [0];
if (rlength < 3 || first == '~' || first == '/' || first == '\\') {
if (basePath == null || (basePath.Length == 1 && basePath [0] == '/'))
basePath = String.Empty;
string slash = (first == '/') ? "" : "/";
if (first == '~') {
if (rlength == 1) {
relPath = "";
} else if (rlength > 1 && relPath [1] == '/') {
relPath = relPath.Substring (2);
slash = "/";
}
return Reduce (HttpRuntime.AppDomainAppVirtualPath + slash + relPath);
}
return Reduce (basePath + slash + relPath);
}
if (basePath == null || basePath == "")
basePath = HttpRuntime.AppDomainAppVirtualPath;
if (basePath.Length <= 1)
basePath = String.Empty;
return Reduce (basePath + "/" + relPath);
}
public static bool IsValidProtocol(string protocol)
{
if(protocol.Length < 1)
return false;
char c = protocol[0];
if(!Char.IsLetter(c))
{
return false;
}
for(int i=1; i < protocol.Length; i++)
{
c = protocol[i];
if(!Char.IsLetterOrDigit(c) && c!='.' && c!='+' && c!='-')
{
return false;
}
}
return true;
}
/*
* MakeRelative("http://www.foo.com/bar1/bar2/file","http://www.foo.com/bar1")
* will return "bar2/file"
* while MakeRelative("http://www.foo.com/bar1/...","http://www.anotherfoo.com")
* return 'null' and so does the call
* MakeRelative("http://www.foo.com/bar1/bar2","http://www.foo.com/bar")
*/
public static string MakeRelative(string fullUrl, string relativeTo)
{
if (fullUrl == relativeTo)
return String.Empty;
if (fullUrl.IndexOf (relativeTo) != 0)
return null;
string leftOver = fullUrl.Substring (relativeTo.Length);
if (leftOver.Length > 0 && leftOver [0] == '/')
leftOver = leftOver.Substring (1);
leftOver = Reduce (leftOver);
if (leftOver.Length > 0 && leftOver [0] == '/')
leftOver = leftOver.Substring (1);
return leftOver;
}
/*
* Check JavaDocs for java.lang.String#RegionMatches(bool, int, String, int, int)
* Could not find anything similar in the System.String class
*/
public static bool RegionMatches(bool ignoreCase, string source, int start, string match, int offset, int len)
{
if(source!=null || match!=null)
{
if(source.Length>0 && match.Length>0)
{
char[] ta = source.ToCharArray();
char[] pa = match.ToCharArray();
if((offset < 0) || (start < 0) || (start > (source.Length - len)) || (offset > (match.Length - len)))
{
return false;
}
while(len-- > 0)
{
char c1 = ta[start++];
char c2 = pa[offset++];
if(c1==c2)
continue;
if(ignoreCase)
{
if(Char.ToUpper(c1)==Char.ToUpper(c2))
continue;
// Check for Gregorian Calendar where the above may not hold good
if(Char.ToLower(c1)==Char.ToLower(c2))
continue;
}
return false;
}
return true;
}
}
return false;
}
public static string Reduce (string path)
{
path = path.Replace ('\\','/');
string [] parts = path.Split ('/');
ArrayList result = new ArrayList ();
int end = parts.Length;
for (int i = 0; i < end; i++) {
string current = parts [i];
if (current == "." )
continue;
if (current == "..") {
if (result.Count == 0) {
if (i == 1) // see bug 52599
continue;
throw new HttpException ("Invalid path.");
}
result.RemoveAt (result.Count - 1);
continue;
}
result.Add (current);
}
if (result.Count == 0)
return "/";
return String.Join ("/", (string []) result.ToArray (typeof (string)));
}
public static string GetDirectory(string url)
{
if(url==null)
{
return null;
}
if(url.Length==0)
{
return String.Empty;
}
url = url.Replace('\\','/');
string baseDir = "";
int last = url.LastIndexOf ('/');
if (last > 0)
baseDir = url.Substring(0, url.LastIndexOf('/'));
if(baseDir.Length==0)
{
baseDir = "/";
}
return baseDir;
}
static string GetFile (string url)
{
if (url == null)
return null;
if (url.Length == 0)
return String.Empty;
url = url.Replace ('\\', '/');
int last = url.LastIndexOf ('/') + 1;
if (last != 0) {
url = url.Substring (last);
}
return url;
}
public static string InsertSessionId (string id, string path)
{
string dir = GetDirectory (path);
if (!dir.EndsWith ("/"))
dir += "/";
return Reduce (dir + "(" + id + ")/" + GetFile (path));
}
public static string GetSessionId (string path)
{
int len = path.Length;
if ((len < SessionId.IdLength + 2) || (path [len - 1] != ')') ||
(path [len - SessionId.IdLength - 2] != '('))
return null;
return path.Substring (len - SessionId.IdLength - 1, SessionId.IdLength);
}
public static string RemoveSessionId (string base_path, string file_path)
{
int len = base_path.Length;
string dir = base_path.Substring (0, len - SessionId.IdLength - 2);
if (!dir.EndsWith ("/"))
dir += "/";
return Reduce (dir + GetFile (file_path));
}
public static string ResolveVirtualPathFromAppAbsolute (string path)
{
if (path [0] != '~') return path;
if (path.Length == 1)
return HttpRuntime.AppDomainAppVirtualPath;
if (path [1] == '/' || path [1] == '\\') {
string appPath = HttpRuntime.AppDomainAppVirtualPath;
if (appPath.Length > 1)
return appPath + "/" + path.Substring (2);
return "/" + path.Substring (2);
}
return path;
}
public static string ResolvePhysicalPathFromAppAbsolute (string path)
{
if (path [0] != '~') return path;
if (path.Length == 1)
return HttpRuntime.AppDomainAppPath;
if (path [1] == '/' || path [1] == '\\') {
string appPath = HttpRuntime.AppDomainAppPath;
if (appPath.Length > 1)
return appPath + "/" + path.Substring (2);
return "/" + path.Substring (2);
}
return path;
}
}
}
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