56dcb4e283
This is to address an issue where HTTP script functions could make calls to localhost and other endpoints inside the simulator's LAN. By default, calls to all private addresses are now blocked as per http://en.wikipedia.org/wiki/Reserved_IP_addresses If you require exceptions to this, configure [Network] OutboundDisallowForUserScriptsExcept in OpenSim.ini
690 lines
24 KiB
C#
690 lines
24 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Mail;
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using System.Net.Security;
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using System.Reflection;
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using System.Text;
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using System.Threading;
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using System.Security.Cryptography.X509Certificates;
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using log4net;
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using Nini.Config;
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using OpenMetaverse;
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using OpenSim.Framework;
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using OpenSim.Framework.Communications;
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using OpenSim.Framework.Servers;
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using OpenSim.Framework.Servers.HttpServer;
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using OpenSim.Region.Framework.Interfaces;
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using OpenSim.Region.Framework.Scenes;
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using Mono.Addins;
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/*****************************************************
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*
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* ScriptsHttpRequests
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*
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* Implements the llHttpRequest and http_response
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* callback.
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*
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* Some stuff was already in LSLLongCmdHandler, and then
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* there was this file with a stub class in it. So,
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* I am moving some of the objects and functions out of
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* LSLLongCmdHandler, such as the HttpRequestClass, the
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* start and stop methods, and setting up pending and
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* completed queues. These are processed in the
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* LSLLongCmdHandler polling loop. Similiar to the
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* XMLRPCModule, since that seems to work.
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*
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* //TODO
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*
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* This probably needs some throttling mechanism but
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* it's wide open right now. This applies to both
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* number of requests and data volume.
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*
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* Linden puts all kinds of header fields in the requests.
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* Not doing any of that:
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* User-Agent
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* X-SecondLife-Shard
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* X-SecondLife-Object-Name
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* X-SecondLife-Object-Key
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* X-SecondLife-Region
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* X-SecondLife-Local-Position
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* X-SecondLife-Local-Velocity
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* X-SecondLife-Local-Rotation
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* X-SecondLife-Owner-Name
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* X-SecondLife-Owner-Key
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*
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* HTTPS support
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*
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* Configurable timeout?
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* Configurable max response size?
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* Configurable
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*
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* **************************************************/
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namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
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{
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[Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "HttpRequestModule")]
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public class HttpRequestModule : ISharedRegionModule, IHttpRequestModule
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{
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// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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private object HttpListLock = new object();
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private int httpTimeout = 30000;
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private string m_name = "HttpScriptRequests";
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private OutboundUrlFilter m_outboundUrlFilter;
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private string m_proxyurl = "";
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private string m_proxyexcepts = "";
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// <request id, HttpRequestClass>
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private Dictionary<UUID, HttpRequestClass> m_pendingRequests;
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private Scene m_scene;
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// private Queue<HttpRequestClass> rpcQueue = new Queue<HttpRequestClass>();
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public HttpRequestModule()
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{
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ServicePointManager.ServerCertificateValidationCallback +=ValidateServerCertificate;
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}
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public static bool ValidateServerCertificate(
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object sender,
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X509Certificate certificate,
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X509Chain chain,
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SslPolicyErrors sslPolicyErrors)
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{
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// If this is a web request we need to check the headers first
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// We may want to ignore SSL
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if (sender is HttpWebRequest)
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{
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HttpWebRequest Request = (HttpWebRequest)sender;
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ServicePoint sp = Request.ServicePoint;
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// We don't case about encryption, get out of here
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if (Request.Headers.Get("NoVerifyCert") != null)
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{
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return true;
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}
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// If there was an upstream cert verification error, bail
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if ((((int)sslPolicyErrors) & ~4) != 0)
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return false;
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// Check for policy and execute it if defined
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if (ServicePointManager.CertificatePolicy != null)
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{
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return ServicePointManager.CertificatePolicy.CheckValidationResult (sp, certificate, Request, 0);
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}
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return true;
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}
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// If it's not HTTP, trust .NET to check it
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if ((((int)sslPolicyErrors) & ~4) != 0)
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return false;
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return true;
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}
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#region IHttpRequestModule Members
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public UUID MakeHttpRequest(string url, string parameters, string body)
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{
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return UUID.Zero;
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}
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public UUID StartHttpRequest(
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uint localID, UUID itemID, string url, List<string> parameters, Dictionary<string, string> headers, string body,
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out HttpInitialRequestStatus status)
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{
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UUID reqID = UUID.Random();
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HttpRequestClass htc = new HttpRequestClass();
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// Partial implementation: support for parameter flags needed
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// see http://wiki.secondlife.com/wiki/LlHTTPRequest
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//
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// Parameters are expected in {key, value, ... , key, value}
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if (parameters != null)
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{
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string[] parms = parameters.ToArray();
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for (int i = 0; i < parms.Length; i += 2)
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{
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switch (Int32.Parse(parms[i]))
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{
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case (int)HttpRequestConstants.HTTP_METHOD:
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htc.HttpMethod = parms[i + 1];
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break;
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case (int)HttpRequestConstants.HTTP_MIMETYPE:
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htc.HttpMIMEType = parms[i + 1];
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break;
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case (int)HttpRequestConstants.HTTP_BODY_MAXLENGTH:
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// TODO implement me
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break;
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case (int)HttpRequestConstants.HTTP_VERIFY_CERT:
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htc.HttpVerifyCert = (int.Parse(parms[i + 1]) != 0);
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break;
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case (int)HttpRequestConstants.HTTP_VERBOSE_THROTTLE:
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// TODO implement me
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break;
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case (int)HttpRequestConstants.HTTP_CUSTOM_HEADER:
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//Parameters are in pairs and custom header takes
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//arguments in pairs so adjust for header marker.
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++i;
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//Maximum of 8 headers are allowed based on the
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//Second Life documentation for llHTTPRequest.
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for (int count = 1; count <= 8; ++count)
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{
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//Not enough parameters remaining for a header?
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if (parms.Length - i < 2)
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break;
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//Have we reached the end of the list of headers?
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//End is marked by a string with a single digit.
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//We already know we have at least one parameter
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//so it is safe to do this check at top of loop.
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if (Char.IsDigit(parms[i][0]))
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break;
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if (htc.HttpCustomHeaders == null)
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htc.HttpCustomHeaders = new List<string>();
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htc.HttpCustomHeaders.Add(parms[i]);
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htc.HttpCustomHeaders.Add(parms[i+1]);
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i += 2;
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}
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break;
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case (int)HttpRequestConstants.HTTP_PRAGMA_NO_CACHE:
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htc.HttpPragmaNoCache = (int.Parse(parms[i + 1]) != 0);
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break;
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}
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}
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}
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htc.RequestModule = this;
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htc.LocalID = localID;
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htc.ItemID = itemID;
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htc.Url = url;
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htc.ReqID = reqID;
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htc.HttpTimeout = httpTimeout;
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htc.OutboundBody = body;
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htc.ResponseHeaders = headers;
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htc.proxyurl = m_proxyurl;
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htc.proxyexcepts = m_proxyexcepts;
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// Same number as default HttpWebRequest.MaximumAutomaticRedirections
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htc.MaxRedirects = 50;
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if (StartHttpRequest(htc))
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{
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status = HttpInitialRequestStatus.OK;
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return htc.ReqID;
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}
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else
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{
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status = HttpInitialRequestStatus.DISALLOWED_BY_FILTER;
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return UUID.Zero;
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}
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}
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/// <summary>
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/// Would a caller to this module be allowed to make a request to the given URL?
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/// </summary>
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/// <returns></returns>
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public bool CheckAllowed(Uri url)
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{
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return m_outboundUrlFilter.CheckAllowed(url);
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}
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public bool StartHttpRequest(HttpRequestClass req)
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{
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if (!CheckAllowed(new Uri(req.Url)))
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return false;
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lock (HttpListLock)
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{
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m_pendingRequests.Add(req.ReqID, req);
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}
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req.Process();
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return true;
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}
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public void StopHttpRequestsForScript(UUID id)
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{
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if (m_pendingRequests != null)
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{
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List<UUID> keysToRemove = null;
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lock (HttpListLock)
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{
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foreach (HttpRequestClass req in m_pendingRequests.Values)
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{
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if (req.ItemID == id)
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{
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req.Stop();
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if (keysToRemove == null)
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keysToRemove = new List<UUID>();
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keysToRemove.Add(req.ReqID);
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}
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}
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if (keysToRemove != null)
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keysToRemove.ForEach(keyToRemove => m_pendingRequests.Remove(keyToRemove));
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}
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}
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}
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/*
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* TODO
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* Not sure how important ordering is is here - the next first
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* one completed in the list is returned, based soley on its list
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* position, not the order in which the request was started or
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* finished. I thought about setting up a queue for this, but
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* it will need some refactoring and this works 'enough' right now
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*/
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public IServiceRequest GetNextCompletedRequest()
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{
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lock (HttpListLock)
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{
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foreach (HttpRequestClass req in m_pendingRequests.Values)
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{
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if (req.Finished)
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return req;
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}
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}
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return null;
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}
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public void RemoveCompletedRequest(UUID id)
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{
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lock (HttpListLock)
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{
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HttpRequestClass tmpReq;
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if (m_pendingRequests.TryGetValue(id, out tmpReq))
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{
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tmpReq.Stop();
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tmpReq = null;
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m_pendingRequests.Remove(id);
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}
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}
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}
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#endregion
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#region ISharedRegionModule Members
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public void Initialise(IConfigSource config)
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{
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m_proxyurl = config.Configs["Startup"].GetString("HttpProxy");
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m_proxyexcepts = config.Configs["Startup"].GetString("HttpProxyExceptions");
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m_outboundUrlFilter = new OutboundUrlFilter("Script HTTP request module", config);
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m_pendingRequests = new Dictionary<UUID, HttpRequestClass>();
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}
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public void AddRegion(Scene scene)
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{
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m_scene = scene;
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m_scene.RegisterModuleInterface<IHttpRequestModule>(this);
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}
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public void RemoveRegion(Scene scene)
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{
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scene.UnregisterModuleInterface<IHttpRequestModule>(this);
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if (scene == m_scene)
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m_scene = null;
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}
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public void PostInitialise()
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{
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}
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public void RegionLoaded(Scene scene)
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{
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}
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public void Close()
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{
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}
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public string Name
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{
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get { return m_name; }
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}
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public Type ReplaceableInterface
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{
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get { return null; }
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}
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#endregion
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}
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public class HttpRequestClass : IServiceRequest
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{
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// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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// Constants for parameters
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// public const int HTTP_BODY_MAXLENGTH = 2;
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// public const int HTTP_METHOD = 0;
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// public const int HTTP_MIMETYPE = 1;
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// public const int HTTP_VERIFY_CERT = 3;
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// public const int HTTP_VERBOSE_THROTTLE = 4;
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// public const int HTTP_CUSTOM_HEADER = 5;
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// public const int HTTP_PRAGMA_NO_CACHE = 6;
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/// <summary>
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/// Module that made this request.
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/// </summary>
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public HttpRequestModule RequestModule { get; set; }
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private bool _finished;
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public bool Finished
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{
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get { return _finished; }
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}
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// public int HttpBodyMaxLen = 2048; // not implemented
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// Parameter members and default values
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public string HttpMethod = "GET";
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public string HttpMIMEType = "text/plain;charset=utf-8";
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public int HttpTimeout;
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public bool HttpVerifyCert = true;
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//public bool HttpVerboseThrottle = true; // not implemented
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public List<string> HttpCustomHeaders = null;
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public bool HttpPragmaNoCache = true;
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// Request info
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private UUID _itemID;
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public UUID ItemID
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{
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get { return _itemID; }
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set { _itemID = value; }
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}
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private uint _localID;
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public uint LocalID
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{
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get { return _localID; }
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set { _localID = value; }
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}
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public DateTime Next;
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public string proxyurl;
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public string proxyexcepts;
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/// <summary>
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/// Number of HTTP redirects that this request has been through.
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/// </summary>
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public int Redirects { get; private set; }
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/// <summary>
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/// Maximum number of HTTP redirects allowed for this request.
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/// </summary>
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public int MaxRedirects { get; set; }
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public string OutboundBody;
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private UUID _reqID;
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public UUID ReqID
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{
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get { return _reqID; }
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set { _reqID = value; }
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}
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public HttpWebRequest Request;
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public string ResponseBody;
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public List<string> ResponseMetadata;
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public Dictionary<string, string> ResponseHeaders;
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public int Status;
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public string Url;
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public void Process()
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{
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SendRequest();
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}
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public void SendRequest()
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{
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try
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{
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Request = (HttpWebRequest)WebRequest.Create(Url);
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Request.AllowAutoRedirect = false;
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Request.Method = HttpMethod;
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Request.ContentType = HttpMIMEType;
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if (!HttpVerifyCert)
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{
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// We could hijack Connection Group Name to identify
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// a desired security exception. But at the moment we'll use a dummy header instead.
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// Request.ConnectionGroupName = "NoVerify";
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Request.Headers.Add("NoVerifyCert", "true");
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}
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// else
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// {
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// Request.ConnectionGroupName="Verify";
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// }
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if (!HttpPragmaNoCache)
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{
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Request.Headers.Add("Pragma", "no-cache");
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}
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if (HttpCustomHeaders != null)
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{
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for (int i = 0; i < HttpCustomHeaders.Count; i += 2)
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Request.Headers.Add(HttpCustomHeaders[i],
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HttpCustomHeaders[i+1]);
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}
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if (!string.IsNullOrEmpty(proxyurl))
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{
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if (!string.IsNullOrEmpty(proxyexcepts))
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{
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string[] elist = proxyexcepts.Split(';');
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Request.Proxy = new WebProxy(proxyurl, true, elist);
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}
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else
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{
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Request.Proxy = new WebProxy(proxyurl, true);
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}
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}
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if (ResponseHeaders != null)
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{
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foreach (KeyValuePair<string, string> entry in ResponseHeaders)
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if (entry.Key.ToLower().Equals("user-agent") && Request is HttpWebRequest)
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((HttpWebRequest)Request).UserAgent = entry.Value;
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else
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Request.Headers[entry.Key] = entry.Value;
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}
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// Encode outbound data
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if (!string.IsNullOrEmpty(OutboundBody))
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{
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byte[] data = Util.UTF8.GetBytes(OutboundBody);
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Request.ContentLength = data.Length;
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using (Stream bstream = Request.GetRequestStream())
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bstream.Write(data, 0, data.Length);
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}
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try
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{
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IAsyncResult result = (IAsyncResult)Request.BeginGetResponse(ResponseCallback, null);
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ThreadPool.RegisterWaitForSingleObject(
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result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), null, HttpTimeout, true);
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}
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catch (WebException e)
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{
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if (e.Status != WebExceptionStatus.ProtocolError)
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{
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throw;
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}
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HttpWebResponse response = (HttpWebResponse)e.Response;
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Status = (int)response.StatusCode;
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ResponseBody = response.StatusDescription;
|
|
_finished = true;
|
|
}
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
// m_log.Debug(
|
|
// string.Format("[SCRIPTS HTTP REQUESTS]: Exception on request to {0} for {1} ", Url, ItemID), e);
|
|
|
|
Status = (int)OSHttpStatusCode.ClientErrorJoker;
|
|
ResponseBody = e.Message;
|
|
_finished = true;
|
|
}
|
|
}
|
|
|
|
private void ResponseCallback(IAsyncResult ar)
|
|
{
|
|
HttpWebResponse response = null;
|
|
|
|
try
|
|
{
|
|
try
|
|
{
|
|
response = (HttpWebResponse)Request.EndGetResponse(ar);
|
|
}
|
|
catch (WebException e)
|
|
{
|
|
if (e.Status != WebExceptionStatus.ProtocolError)
|
|
{
|
|
throw;
|
|
}
|
|
|
|
response = (HttpWebResponse)e.Response;
|
|
}
|
|
|
|
Status = (int)response.StatusCode;
|
|
|
|
using (Stream stream = response.GetResponseStream())
|
|
{
|
|
StreamReader reader = new StreamReader(stream, Encoding.UTF8);
|
|
ResponseBody = reader.ReadToEnd();
|
|
}
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
Status = (int)OSHttpStatusCode.ClientErrorJoker;
|
|
ResponseBody = e.Message;
|
|
|
|
// m_log.Debug(
|
|
// string.Format("[SCRIPTS HTTP REQUESTS]: Exception on response to {0} for {1} ", Url, ItemID), e);
|
|
}
|
|
finally
|
|
{
|
|
if (response != null)
|
|
response.Close();
|
|
|
|
// We need to resubmit
|
|
if (
|
|
(Status == (int)HttpStatusCode.MovedPermanently
|
|
|| Status == (int)HttpStatusCode.Found
|
|
|| Status == (int)HttpStatusCode.SeeOther
|
|
|| Status == (int)HttpStatusCode.TemporaryRedirect))
|
|
{
|
|
if (Redirects >= MaxRedirects)
|
|
{
|
|
Status = (int)OSHttpStatusCode.ClientErrorJoker;
|
|
ResponseBody = "Number of redirects exceeded max redirects";
|
|
_finished = true;
|
|
}
|
|
else
|
|
{
|
|
string location = response.Headers["Location"];
|
|
|
|
if (location == null)
|
|
{
|
|
Status = (int)OSHttpStatusCode.ClientErrorJoker;
|
|
ResponseBody = "HTTP redirect code but no location header";
|
|
_finished = true;
|
|
}
|
|
else if (!RequestModule.CheckAllowed(new Uri(location)))
|
|
{
|
|
Status = (int)OSHttpStatusCode.ClientErrorJoker;
|
|
ResponseBody = "URL from HTTP redirect blocked: " + location;
|
|
_finished = true;
|
|
}
|
|
else
|
|
{
|
|
Status = 0;
|
|
Url = response.Headers["Location"];
|
|
Redirects++;
|
|
ResponseBody = null;
|
|
|
|
// m_log.DebugFormat("Redirecting to [{0}]", Url);
|
|
|
|
Process();
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_finished = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
private void TimeoutCallback(object state, bool timedOut)
|
|
{
|
|
if (timedOut)
|
|
Request.Abort();
|
|
}
|
|
|
|
public void Stop()
|
|
{
|
|
// m_log.DebugFormat("[SCRIPTS HTTP REQUESTS]: Stopping request to {0} for {1} ", Url, ItemID);
|
|
|
|
if (Request != null)
|
|
Request.Abort();
|
|
}
|
|
}
|
|
} |