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/* GContact.cs
 
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 *
 
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 * GNOME Do is the legal property of its developers. Please refer to the
 
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 * COPYRIGHT file distributed with this
 
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 * source distribution.
 
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 *
 
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 * This program is free software: you can redistribute it and/or modify
 
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 * it under the terms of the GNU General Public License as published by
 
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 * the Free Software Foundation, either version 3 of the License, or
 
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 * (at your option) any later version.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License
 
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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 */
 
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using System;
 
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using System.Xml;
 
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using System.Net;
 
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using System.Web;
 
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using System.IO;
 
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using System.Threading;
 
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using System.Collections;
 
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using System.Collections.Generic;
 
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using Do.Addins;
 
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using Do.Universe;
 
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using Gnome.Keyring;
 
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using Google.GData.Client;
 
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namespace GContacts
 
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{       
 
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        public static class GContact
 
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        {
 
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                private static string auth_token, username, password;
 
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                private static List<IItem> items;
 
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                private static Timer ClearContactsTimer;
 
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                const int CacheSeconds  = 350; //cache contacts
 
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                static GContact () {
 
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                        items = new List<IItem> ();
 
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                        SetCredentials ();
 
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                        ClearContactsTimer = new Timer (ClearContacts);
 
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                }
 
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                public static List<IItem> Contacts {
 
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                        get { return items; }
 
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                }
 
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                public static string Auth_Token {
 
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                        get { return auth_token; }
 
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                        set { auth_token = value; }
 
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                }
 
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                public static string Username {
 
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                        get { return username; }
 
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                        set { username = value; }
 
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                }
 
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                public static string Password {
 
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                        get { return password; }
 
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                        set { password = value; }
 
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                }
 
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                public static void UpdateContacts ()
 
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                {
 
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                        if (Auth_Token == null) return;
 
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                        try {
 
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                                if (!Monitor.TryEnter (items)) return;
 
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                                ClearContactsTimer.Change (CacheSeconds*1000, Timeout.Infinite);
 
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                                if (items.Count > 0) {
 
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                                        Monitor.Exit (items);
 
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                                        return;
 
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                                }
 
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                                XmlDocument contacts = new XmlDocument ();
 
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                                contacts.Load (MakeRequest ().GetResponseStream ());
 
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                                ContactItem buddy;
 
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                                string key, email, phone, address, name;
 
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                                key = email = phone = address = name = "";
 
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                                int i = 0;
 
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                                Dictionary<string, string> emails = new Dictionary<string,string> ();
 
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                                foreach (XmlNode contact in contacts.GetElementsByTagName ("entry")) {
 
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                                        i = 0;
 
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                                        foreach (XmlNode cont in contact.ChildNodes) {
 
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                                                switch (cont.Name) {
 
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                                                case ("title"): name = cont.InnerText; break;
 
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                                                case ("gd:email"):
 
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                                                        i++;
 
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                                                        email = cont.Attributes.GetNamedItem ("address").Value;
 
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                                                        key = "email." + i;
 
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                                                        try {
 
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                                                                if (cont.Attributes.GetNamedItem ("primary").Value == "true" )
 
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                                                                        key = "email";
 
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                                                        } catch {
 
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                                                        }
 
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                                                        if(!emails.ContainsKey (key))
 
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                                                                emails.Add (key, email);
 
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                                                        break;
 
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                                                case ("gd:phoneNumber") : phone = cont.InnerText; break;
 
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                                                case ("gd:postalAddress"): address = cont.InnerText; break;
 
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                                                }
 
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                                        }
 
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                                        if (!name.Equals ("") && !email.Equals ("")) {
 
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                                                buddy = ContactItem.Create (name);
 
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                                                foreach (KeyValuePair<string, string> kvp in emails) 
 
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                                                        buddy[kvp.Key] = kvp.Value;
 
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                                                buddy["phone"] = phone;
 
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                                                buddy["address"] = address;
 
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                                                //For some reason this is not working automatically, so
 
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                                                //let's force it to do what we want.
 
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                                                buddy["description"] = buddy["email"];
 
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                                                items.Add (buddy);
 
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                                                //Console.Error.WriteLine(name + ":" + buddy["email"]);
 
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                                                emails.Clear ();
 
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                                        }
 
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                                }
 
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                                Monitor.Exit (items);
 
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                        } catch (Exception e) {
 
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                                Console.Error.WriteLine (e.Message);
 
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                                return;
 
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                        }
 
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                }
 
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                private static HttpWebResponse MakeRequest ()
 
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                {
 
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                        if (auth_token == null) return null;
 
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                        string encoded_username = HttpUtility.UrlEncode (username);
 
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                        string url = string.Format ("http://www.google.com/m8/feeds/contacts/{0}/base?max-results=5000",
 
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                                                    encoded_username);
 
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                        HttpWebRequest req = (HttpWebRequest) WebRequest.Create (url);
 
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                        WebHeaderCollection auth_header = new WebHeaderCollection ();
 
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                        auth_header.Add ("Authorization: GoogleLogin auth="+auth_token);
 
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                        req.Headers = auth_header;
 
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                        req.Method = "GET";
 
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                        return (HttpWebResponse) req.GetResponse ();
 
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                }
 
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                private static void ClearContacts (object state)
 
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                {
 
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                        lock (items) {
 
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                                items.Clear ();
 
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                        }               
 
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                }
 
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                private static void SetCredentials ()
 
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                {
 
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                        string keyring_item_name = "Google Account";
 
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                        Hashtable request_attributes = new Hashtable();
 
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                        request_attributes["name"] = keyring_item_name;
 
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                        try {
 
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                                foreach(ItemData result in Ring.Find(ItemType.GenericSecret, request_attributes)) {
 
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                                        if(!result.Attributes.ContainsKey("name") || !result.Attributes.ContainsKey("username") ||
 
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                                                (result.Attributes["name"] as string) != keyring_item_name) 
 
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                                                continue;
 
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                                        username = (string)result.Attributes["username"];
 
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                                        password = result.Secret;
 
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                                        if (username == null || username == String.Empty || password == null || password == String.Empty)
 
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                                                throw new ApplicationException ("Invalid username/password in keyring");
 
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                                }
 
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                        } catch (Exception e) {
 
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                                Console.Error.WriteLine (e.Message);
 
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                                string account_info = Environment.GetEnvironmentVariable ("HOME")
 
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                                        + "/.config/gnome-do/google-name";
 
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                                try {
 
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                                        StreamReader reader = File.OpenText(account_info);
 
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                                        username = reader.ReadLine ();
 
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                                        password = reader.ReadLine ();
 
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                                        WriteAccount ();
 
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                                } catch { 
 
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                                        Console.Error.WriteLine ("[ERROR] " + account_info + " cannot be read!");
 
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                                } 
 
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                        }
 
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                }
 
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                private static void WriteAccount ()
 
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                {
 
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                        string keyring_item_name = "Google Account";
 
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                        string keyring;
 
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                        try {
 
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                                keyring = Ring.GetDefaultKeyring();
 
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                        } catch {
 
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                                username = null;
 
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                                password = null;
 
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                                return;
 
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                        }
 
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                        Hashtable update_request_attributes = new Hashtable();
 
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                        update_request_attributes["name"] = keyring_item_name;
 
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                        update_request_attributes["username"] = username;
 
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                        try {
 
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                                Ring.CreateItem(keyring, ItemType.GenericSecret, keyring_item_name,
 
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                                                update_request_attributes, password, true);
 
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                        } catch (Exception e) {
 
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                                Console.WriteLine(e.Message);
 
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                        }
 
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                }                       
 
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        }
 
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}