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GoogleConnection.cs

//
// Mono.Google.GoogleConnection.cs:
//
// Authors:
//    Gonzalo Paniagua Javier (gonzalo@ximian.com)
//    Stephane Delcroix (stephane@delcroix.org)
//
// (C) Copyright 2006 Novell, Inc. (http://www.novell.com)
// (C) Copyright 2007 S. Delcroix
//

// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Check the Google Authentication Page at http://code.google.com/apis/accounts/AuthForInstalledApps.html
//

using System;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
using System.Reflection;

namespace Mono.Google {
      public class GoogleConnection {
            string user;
            GoogleService service;
            string auth;
            string appname;

            public GoogleConnection (GoogleService service)
            {
                  this.service = service;
            }

            public string ApplicationName {
                  get {
                        if (appname == null) {
                              Assembly assembly = Assembly.GetEntryAssembly ();
                              if (assembly == null)
                                    throw new InvalidOperationException ("You need to set GoogleConnection.ApplicationName.");
                              AssemblyName aname = assembly.GetName ();
                              appname = String.Format ("{0}-{1}", aname.Name, aname.Version);
                        }

                        return appname;
                  }

                  set {
                        if (value == null || value == "")
                              throw new ArgumentException ("Cannot be null or empty", "value");

                        appname = value;
                  }
            }

            public void Authenticate (string user, string password)
            {
                  if (user == null)
                        throw new ArgumentNullException ("user");

                  if (this.user != null)
                        throw new InvalidOperationException (String.Format ("Already authenticated for {0}", this.user));

                  this.user = user;
                  this.auth = Authentication.GetAuthorization (this, user, password, service, null, null);
                  if (this.auth == null) {
                        this.user = null;
                        throw new Exception (String.Format ("Authentication failed for user {0}", user));
                  }
            }

            public void Authenticate (string user, string password, string token, string captcha)
            {
                  if (user == null)
                        throw new ArgumentNullException ("user");

                  if (token == null)
                        throw new ArgumentNullException ("token");

                  if (captcha == null)
                        throw new ArgumentNullException ("captcha");

                  if (this.user != null)
                        throw new InvalidOperationException (String.Format ("Already authenticated for {0}", this.user));

                  this.user = user;
                  this.auth = Authentication.GetAuthorization (this, user, password, service, token, captcha);
                  if (this.auth == null) {
                        this.user = null;
                        throw new Exception (String.Format ("Authentication failed for user {0}", user));
                  }
            }

            public HttpWebRequest AuthenticatedRequest (string url)
            {
                  if (url == null)
                        throw new ArgumentNullException ("url");

                  HttpWebRequest req = (HttpWebRequest) WebRequest.Create (url);
                  if (auth != null)
                        req.Headers.Add ("Authorization: GoogleLogin auth=" + auth);
                  return req;
            }

            public string DownloadString (string url)
            {
                  if (url == null)
                        throw new ArgumentNullException ("url");

                  string received = null;
                  HttpWebRequest req = AuthenticatedRequest (url);
                  HttpWebResponse response = (HttpWebResponse) req.GetResponse ();
                  Encoding encoding = Encoding.UTF8;
                  if (response.ContentEncoding != "") {
                        try {
                              encoding = Encoding.GetEncoding (response.ContentEncoding);
                        } catch {}
                  }

                  using (Stream stream = response.GetResponseStream ()) {
                        StreamReader sr = new StreamReader (stream, encoding);
                        received = sr.ReadToEnd ();
                  }
                  response.Close ();
                  return received;
            }

            public byte [] DownloadBytes (string url)
            {
                  if (url == null)
                        throw new ArgumentNullException ("url");

                  HttpWebRequest req = AuthenticatedRequest (url);
                  HttpWebResponse response = (HttpWebResponse) req.GetResponse ();
                  byte [] bytes = null;
                  using (Stream stream = response.GetResponseStream ()) {
                        if (response.ContentLength != -1) {
                              bytes = new byte [response.ContentLength];
                              stream.Read (bytes, 0, bytes.Length);
                        } else {
                              MemoryStream ms = new MemoryStream ();
                              bytes = new byte [4096];
                              int nread;
                              while ((nread = stream.Read (bytes, 0, bytes.Length)) > 0) {
                                    ms.Write (bytes, 0, nread);
                                    if (nread < bytes.Length)
                                          break;
                              }
                              bytes = ms.ToArray ();
                        }
                  }
                  response.Close ();

                  return bytes;
            }

            public void DownloadToStream (string url, Stream output)
            {
                  if (url == null)
                        throw new ArgumentNullException ("url");

                  if (output == null)
                        throw new ArgumentNullException ("output");

                  if (!output.CanWrite)
                        throw new ArgumentException ("The stream is not writeable", "output");

                  HttpWebRequest req = AuthenticatedRequest (url);
                  HttpWebResponse response = (HttpWebResponse) req.GetResponse ();
                  byte [] bytes = null;
                  using (Stream stream = response.GetResponseStream ()) {
                        bytes = new byte [4096];
                        int nread;
                        while ((nread = stream.Read (bytes, 0, bytes.Length)) > 0) {
                              output.Write (bytes, 0, nread);
                        }
                  }
                  response.Close ();
            }

            public string User {
                  get { return user; }
            }

            public GoogleService Service {
                  get { return service; }
            }

            internal string AuthToken {
                  get { return auth; }
            }
      }
}


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