1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207

208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252

using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;

using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Web;
using System.Threading;
using System.Text.RegularExpressions;

namespace Exyus.Web
{
    public class HTTPClient
    {
        // public properties
        public WebHeaderCollection RequestHeaders = new WebHeaderCollection();
        public WebHeaderCollection ResponseHeaders = new WebHeaderCollection();
        public CookieContainer CookieCollection = new CookieContainer();
        public HttpStatusCode ResponseStatusCode = HttpStatusCode.OK;
        public string ResponseDescription = string.Empty;
        public DateTime ResponseLastModified = System.DateTime.MaxValue;
        public NetworkCredential Credentials = new NetworkCredential();
        public long ResponseLength = 0;
        public string UserAgent = string.Empty;
        public bool PreAuthenticate = true;
        public string Accept = "*/*";
        public bool FollowRedirects = true;
        public string HTTPVersion = "1.1";

        public HTTPClient() { }
        public HTTPClient(NetworkCredential credentials)
        {
            this.Credentials = credentials;
        }
        public HTTPClient(string user, string password)
        {
            this.Credentials = new NetworkCredential(user, password);
        }
        // method that makes the call
        public string Execute(string url)
        {
            return Execute(url, Constants.HttpGet, Constants.cType_Xml, string.Empty);
        }
        public string Execute(string url, string method)
        {
            return Execute(url, method, Constants.cType_Xml, string.Empty);
        }
        public string Execute(string url, string method, string contentType)
        {
            return Execute(url, method, contentType, string.Empty);
        }
        public string Execute(string url, string method, string contentType, string body)
        {
            HttpWebRequest req = null;
            HttpWebResponse resp= null;
            string rtnBody = string.Empty;

            try
            {
                // build request object
                req = (HttpWebRequest)WebRequest.Create(url);
                req.UserAgent = (this.UserAgent.Length!=0?this.UserAgent:Constants.msc_exyus_agent);
                req.Method = method.ToUpper();
                req.ContentType = contentType;
                req.Accept = this.Accept;
                req.ContentLength = body.Length;
                req.PreAuthenticate = this.PreAuthenticate;
                if (this.Credentials.UserName != string.Empty)
                    req.Credentials = this.Credentials;

                // set headers
                if (this.RequestHeaders != null)
                {
                    for (int i = 0; i < this.RequestHeaders.Count; i++)
                    {
                        // some headers must be set as properties only
                        string key = this.RequestHeaders.GetKey(i);
                        string value = this.RequestHeaders[i];
                        switch (key.ToLower())
                        {
                            case "user-agent":
                                req.UserAgent = value;
                                break;
                            case "if-modified-since":
                                req.IfModifiedSince = DateTime.Parse(value);
                                break;
                            case "accept":
                                req.Accept = value;
                                break;
                            default:
                                req.Headers.Set(key, value);
                                break;
                        }
                    }
                }

                // set cookies
                if (this.CookieCollection != null)
                {
                  req.CookieContainer = this.CookieCollection;
                }
                if (HttpContext.Current != null &&
                    HttpContext.Current.Request != null &&
                    HttpContext.Current.Request.Headers != null &&
                    HttpContext.Current.Request.Headers[Constants.hdr_cookie] != null
                    )
                {
                  req.CookieContainer.SetCookies(new Uri(url), HttpContext.Current.Request.Headers[Constants.hdr_cookie]);
                }

                // set the version
                if (this.HTTPVersion != string.Empty)
                {
                  req.ProtocolVersion = new Version(this.HTTPVersion);
                }

                // set flag for redirects
                req.AllowAutoRedirect = this.FollowRedirects;


                // set body
                if (body != null && body.Trim() != string.Empty)
                {
                    using (StreamWriter sw = new StreamWriter(req.GetRequestStream()))
                    {
                        sw.Write(body);
                        sw.Close();
                    }
                }

                // now use request obj to populate response obj
                resp = (HttpWebResponse)req.GetResponse();

                // get properties
                this.ResponseLength = resp.ContentLength;
                this.ResponseStatusCode = resp.StatusCode;
                this.ResponseDescription = resp.StatusDescription;
                this.ResponseLastModified = resp.LastModified;

                // get headers
                this.ResponseHeaders = resp.Headers;

                // get cookies
                this.CookieCollection = new CookieContainer();
                foreach (Cookie ck in resp.Cookies)
                    this.CookieCollection.Add(ck);

                // get body (if one was passed
                if (this.FollowRedirects == false && (int)this.ResponseStatusCode > 299)
                {
                  rtnBody = "";
                }
                else
                {
                  if (resp.ContentLength != 0)
                  {
                    using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
                    {
                      rtnBody = sr.ReadToEnd();
                      sr.Close();
                    }
                  }
                }
                //if (resp.ContentLength != 0)
                //{
                //    using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
                //    {
                //        rtnBody = sr.ReadToEnd();
                //        sr.Close();
                //    }
                //}

                // clean up
                if (resp != null)
                    resp.Close();

                resp = null;
                req = null;

                // return the results (if any)
                return rtnBody;
            }
            catch (HttpException hex)
            {
                throw new HttpException(hex.GetHttpCode(), hex.Message);
            }
            catch (WebException wex)
            {
                // typical http error
                if (wex.Status == WebExceptionStatus.ProtocolError)
                {
                    HttpWebResponse wrsp = (HttpWebResponse)wex.Response;
                    throw new HttpException((int)wrsp.StatusCode, wrsp.StatusDescription);
                }
                else
                {
                    throw new HttpException(500, wex.Message);
                }
            }
            catch (Exception ex)
            {
                throw new HttpException(500, ex.Message);
            }
        }
    }

    // used to invalidate a collection of URIs
    public class CollectionRequestor
    {
        public string[] Uri;
        public CookieContainer CookieCollection = new CookieContainer();
        public string defaultType;
        public Hashtable UriTypeMap;
        public bool NoCache = true;

        public void Execute()
        {
            Utility util = new Utility();
            HTTPClient cl = new HTTPClient();
            cl.UserAgent = Constants.msc_exyus_cachebot;

            if (this.NoCache == true)
            {
                cl.RequestHeaders.Set(Constants.hdr_cache_control, "no-cache");
            }
            cl.Credentials = util.GetSystemCredentials();
            cl.CookieCollection = this.CookieCollection;

            for (int i = 0; i < Uri.Length; i++)
            {
                string[] media = util.GetResourceMediaTypes(Uri[i], this.defaultType, this.UriTypeMap);
                if (media != null && media.Length != 0)
                {
                    for (int j = 0; j < media.Length; j++)
                    {
                        cl.RequestHeaders.Set("Accept", media[j]);
                        try {cl.Execute(this.Uri[i], "head", media[j]);}
                        catch (Exception ex) { }
                    }
                }
                else
                {
                    try {cl.Execute(this.Uri[i], "head");}
                    catch (Exception ex) { }
                }
            }
        }
    }

}