1 files changed, 330 insertions, 0 deletions

diff --git a/OpenSim/Framework/WebUtil.cs b/OpenSim/Framework/WebUtil.cs
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+++ b/OpenSim/Framework/WebUtil.cs
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+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.IO;
+using System.Net;
+using System.Net.Security;
+using System.Reflection;
+using System.Text;
+using System.Web;
+using log4net;
+using OpenSim.Framework.Servers.HttpServer;
+using OpenMetaverse.StructuredData;
+
+namespace OpenSim.Framework
+{
+    /// <summary>
+    /// Miscellaneous static methods and extension methods related to the web
+    /// </summary>
+    public static class WebUtil
+    {
+        private static readonly ILog m_log =
+                LogManager.GetLogger(
+                MethodBase.GetCurrentMethod().DeclaringType);
+
+        /// <summary>
+        /// Send LLSD to an HTTP client in application/llsd+json form
+        /// </summary>
+        /// <param name="response">HTTP response to send the data in</param>
+        /// <param name="body">LLSD to send to the client</param>
+        public static void SendJSONResponse(OSHttpResponse response, OSDMap body)
+        {
+            byte[] responseData = Encoding.UTF8.GetBytes(OSDParser.SerializeJsonString(body));
+
+            response.ContentEncoding = Encoding.UTF8;
+            response.ContentLength = responseData.Length;
+            response.ContentType = "application/llsd+json";
+            response.Body.Write(responseData, 0, responseData.Length);
+        }
+
+        /// <summary>
+        /// Send LLSD to an HTTP client in application/llsd+xml form
+        /// </summary>
+        /// <param name="response">HTTP response to send the data in</param>
+        /// <param name="body">LLSD to send to the client</param>
+        public static void SendXMLResponse(OSHttpResponse response, OSDMap body)
+        {
+            byte[] responseData = OSDParser.SerializeLLSDXmlBytes(body);
+
+            response.ContentEncoding = Encoding.UTF8;
+            response.ContentLength = responseData.Length;
+            response.ContentType = "application/llsd+xml";
+            response.Body.Write(responseData, 0, responseData.Length);
+        }
+
+        /// <summary>
+        /// Make a GET or GET-like request to a web service that returns LLSD
+        /// or JSON data
+        /// </summary>
+        public static OSDMap ServiceRequest(string url, string httpVerb)
+        {
+            string errorMessage;
+
+            try
+            {
+                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
+                request.Method = httpVerb;
+
+                using (WebResponse response = request.GetResponse())
+                {
+                    using (Stream responseStream = response.GetResponseStream())
+                    {
+                        try
+                        {
+                            string responseStr = responseStream.GetStreamString();
+                            OSD responseOSD = OSDParser.Deserialize(responseStr);
+                            if (responseOSD.Type == OSDType.Map)
+                                return (OSDMap)responseOSD;
+                            else
+                                errorMessage = "Response format was invalid.";
+                        }
+                        catch
+                        {
+                            errorMessage = "Failed to parse the response.";
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                m_log.Warn("GET from URL " + url + " failed: " + ex.Message);
+                errorMessage = ex.Message;
+            }
+
+            return new OSDMap { { "Message", OSD.FromString("Service request failed. " + errorMessage) } };
+        }
+
+        /// <summary>
+        /// POST URL-encoded form data to a web service that returns LLSD or
+        /// JSON data
+        /// </summary>
+        public static OSDMap PostToService(string url, NameValueCollection data)
+        {
+            string errorMessage;
+
+            try
+            {
+                string queryString = BuildQueryString(data);
+                byte[] requestData = System.Text.Encoding.UTF8.GetBytes(queryString);
+
+                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
+                request.Method = "POST";
+                request.ContentLength = requestData.Length;
+                request.ContentType = "application/x-www-form-urlencoded";
+
+                using (Stream requestStream = request.GetRequestStream())
+                    requestStream.Write(requestData, 0, requestData.Length);
+
+                using (WebResponse response = request.GetResponse())
+                {
+                    using (Stream responseStream = response.GetResponseStream())
+                    {
+                        try
+                        {
+                            string responseStr = responseStream.GetStreamString();
+                            OSD responseOSD = OSDParser.Deserialize(responseStr);
+                            if (responseOSD.Type == OSDType.Map)
+                                return (OSDMap)responseOSD;
+                            else
+                                errorMessage = "Response format was invalid.";
+                        }
+                        catch
+                        {
+                            errorMessage = "Failed to parse the response.";
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                m_log.Warn("POST to URL " + url + " failed: " + ex.Message);
+                errorMessage = ex.Message;
+            }
+
+            return new OSDMap { { "Message", OSD.FromString("Service request failed. " + errorMessage) } };
+        }
+
+        #region Uri
+
+        /// <summary>
+        /// Combines a Uri that can contain both a base Uri and relative path
+        /// with a second relative path fragment
+        /// </summary>
+        /// <param name="uri">Starting (base) Uri</param>
+        /// <param name="fragment">Relative path fragment to append to the end
+        /// of the Uri</param>
+        /// <returns>The combined Uri</returns>
+        /// <remarks>This is similar to the Uri constructor that takes a base
+        /// Uri and the relative path, except this method can append a relative
+        /// path fragment on to an existing relative path</remarks>
+        public static Uri Combine(this Uri uri, string fragment)
+        {
+            string fragment1 = uri.Fragment;
+            string fragment2 = fragment;
+
+            if (!fragment1.EndsWith("/"))
+                fragment1 = fragment1 + '/';
+            if (fragment2.StartsWith("/"))
+                fragment2 = fragment2.Substring(1);
+
+            return new Uri(uri, fragment1 + fragment2);
+        }
+
+        /// <summary>
+        /// Combines a Uri that can contain both a base Uri and relative path
+        /// with a second relative path fragment. If the fragment is absolute,
+        /// it will be returned without modification
+        /// </summary>
+        /// <param name="uri">Starting (base) Uri</param>
+        /// <param name="fragment">Relative path fragment to append to the end
+        /// of the Uri, or an absolute Uri to return unmodified</param>
+        /// <returns>The combined Uri</returns>
+        public static Uri Combine(this Uri uri, Uri fragment)
+        {
+            if (fragment.IsAbsoluteUri)
+                return fragment;
+
+            string fragment1 = uri.Fragment;
+            string fragment2 = fragment.ToString();
+
+            if (!fragment1.EndsWith("/"))
+                fragment1 = fragment1 + '/';
+            if (fragment2.StartsWith("/"))
+                fragment2 = fragment2.Substring(1);
+
+            return new Uri(uri, fragment1 + fragment2);
+        }
+
+        /// <summary>
+        /// Appends a query string to a Uri that may or may not have existing 
+        /// query parameters
+        /// </summary>
+        /// <param name="uri">Uri to append the query to</param>
+        /// <param name="query">Query string to append. Can either start with ?
+        /// or just containg key/value pairs</param>
+        /// <returns>String representation of the Uri with the query string
+        /// appended</returns>
+        public static string AppendQuery(this Uri uri, string query)
+        {
+            if (String.IsNullOrEmpty(query))
+                return uri.ToString();
+
+            if (query[0] == '?' || query[0] == '&')
+                query = query.Substring(1);
+
+            string uriStr = uri.ToString();
+
+            if (uriStr.Contains("?"))
+                return uriStr + '&' + query;
+            else
+                return uriStr + '?' + query;
+        }
+
+        #endregion Uri
+
+        #region NameValueCollection
+
+        /// <summary>
+        /// Convert a NameValueCollection into a query string. This is the
+        /// inverse of HttpUtility.ParseQueryString()
+        /// </summary>
+        /// <param name="parameters">Collection of key/value pairs to convert</param>
+        /// <returns>A query string with URL-escaped values</returns>
+        public static string BuildQueryString(NameValueCollection parameters)
+        {
+            List<string> items = new List<string>(parameters.Count);
+
+            foreach (string key in parameters.Keys)
+            {
+                foreach (string value in parameters.GetValues(key))
+                    items.Add(String.Concat(key, "=", HttpUtility.UrlEncode(value ?? String.Empty)));
+            }
+
+            return String.Join("&", items.ToArray());
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="collection"></param>
+        /// <param name="key"></param>
+        /// <returns></returns>
+        public static string GetOne(this NameValueCollection collection, string key)
+        {
+            string[] values = collection.GetValues(key);
+            if (values != null && values.Length > 0)
+                return values[0];
+
+            return null;
+        }
+
+        #endregion NameValueCollection
+
+        #region Stream
+
+        /// <summary>
+        /// Copies the contents of one stream to another, starting at the 
+        /// current position of each stream
+        /// </summary>
+        /// <param name="copyFrom">The stream to copy from, at the position 
+        /// where copying should begin</param>
+        /// <param name="copyTo">The stream to copy to, at the position where 
+        /// bytes should be written</param>
+        /// <param name="maximumBytesToCopy">The maximum bytes to copy</param>
+        /// <returns>The total number of bytes copied</returns>
+        /// <remarks>
+        /// Copying begins at the streams' current positions. The positions are
+        /// NOT reset after copying is complete.
+        /// </remarks>
+        public static int CopyTo(this Stream copyFrom, Stream copyTo, int maximumBytesToCopy)
+        {
+            byte[] buffer = new byte[4096];
+            int readBytes;
+            int totalCopiedBytes = 0;
+
+            while ((readBytes = copyFrom.Read(buffer, 0, Math.Min(4096, maximumBytesToCopy))) > 0)
+            {
+                int writeBytes = Math.Min(maximumBytesToCopy, readBytes);
+                copyTo.Write(buffer, 0, writeBytes);
+                totalCopiedBytes += writeBytes;
+                maximumBytesToCopy -= writeBytes;
+            }
+
+            return totalCopiedBytes;
+        }
+
+        /// <summary>
+        /// Converts an entire stream to a string, regardless of current stream
+        /// position
+        /// </summary>
+        /// <param name="stream">The stream to convert to a string</param>
+        /// <returns></returns>
+        /// <remarks>When this method is done, the stream position will be 
+        /// reset to its previous position before this method was called</remarks>
+        public static string GetStreamString(this Stream stream)
+        {
+            string value = null;
+
+            if (stream != null && stream.CanRead)
+            {
+                long rewindPos = -1;
+
+                if (stream.CanSeek)
+                {
+                    rewindPos = stream.Position;
+                    stream.Seek(0, SeekOrigin.Begin);
+                }
+
+                StreamReader reader = new StreamReader(stream);
+                value = reader.ReadToEnd();
+
+                if (rewindPos >= 0)
+                    stream.Seek(rewindPos, SeekOrigin.Begin);
+            }
+
+            return value;
+        }
+
+        #endregion Stream
+    }
+}