[C#]DropBox開發系列 - 使用DropNet進行DropBox的二次登入

筆者在[C#]DropBox開發系列 - 使用DropNet進行DropBox的OAuth認證這篇稍稍介紹了一下怎樣用DropNet去登入DropBox帳號,並授權給應用程式存取DropBox。這樣的登入與授權的動作在應用程式中不會每次都做,通常是第一次做了取得Token後,再次登入時就改成用帶入Token的方式去做認證,只要Token尚未過期基本上都不會再次要求授權。

使用DropNet進行這樣的處理很簡單,DropNetClient類別有兩個建構子,有個建構子允許我們帶入userToken與userSecret。

        public DropNetClient(string apiKey, string appSecret);
public DropNetClient(string apiKey, string appSecret, string userToken, string userSecret);


而我們再做完OAuth認證後取得的AccessToken就內含userToken與userSecret這兩個值,我們只需要在第一次做完認證時將這兩個值儲存起來,在下次認證時一併帶入建構子中建立DropNetClient就可以了。或是後續再透過DropNetClient.UserLogin來設定也可以。

像是下面這樣:


if (!String.IsNullOrEmpty(Properties.Settings.Default.SECRET) && !String.IsNullOrEmpty(Properties.Settings.Default.TOKEN))
{
m_DropNetClient.UserLogin = new UserLogin()
{
Secret = Properties.Settings.Default.SECRET,
Token = Properties.Settings.Default.TOKEN
};

return;
}


if (DoOAuth(callbackUrl, cancelCallbackUrl, size) == DialogResult.OK)
{
var accessToken = m_DropNetClient.GetAccessToken();
Properties.Settings.Default.SECRET = accessToken.Secret;
Properties.Settings.Default.TOKEN = accessToken.Token;
Properties.Settings.Default.Save();
}

這邊的程式筆者是在取得AccessToken後將Secret與Token存入設定檔中,下次認證時若是設定檔中有就直接取用。

最後一樣附上完整的範例程式:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DropNet;
using DropNetDemo.Properties;
using DropNet.Models;

namespace DropNetDemo
{
public partial class Form1 : Form
{
#region Var
private DropNetClient _dropNetClient;
#endregion

#region Private Property
private DropNetClient m_DropNetClient
{
get
{
return _dropNetClient ?? (_dropNetClient = new DropNetClient(tbxAppKey.Text, tbxAppSecret.Text));
}
set
{
_dropNetClient = value;
}
}
#endregion

public Form1()
{
InitializeComponent();
}

private void SetSecretAndToken(string secret, string token)
{
Settings.Default.SECRET = secret;
Settings.Default.TOKEN = token;
}

private void btnLogin_Click(object sender, EventArgs e)
{
if (!String.IsNullOrEmpty(Properties.Settings.Default.SECRET) && !String.IsNullOrEmpty(Properties.Settings.Default.TOKEN))
{
m_DropNetClient.UserLogin = new UserLogin()
{
Secret = Properties.Settings.Default.SECRET,
Token = Properties.Settings.Default.TOKEN
};
return;
}

var callbackUrl = “https://www.dropbox.com/1/oauth/authorize“;
var cancelCallbackUrl = “https://www.dropbox.com/home“;
var size = new Size(1024, 600);

if (DoOAuth(callbackUrl, cancelCallbackUrl, size) == DialogResult.OK)
{
var accessToken = m_DropNetClient.GetAccessToken();
Properties.Settings.Default.SECRET = accessToken.Secret;
Properties.Settings.Default.TOKEN = accessToken.Token;
Properties.Settings.Default.Save();
}
}

private DialogResult DoOAuth(string callbackUrl, string cancelCallbackUrl, System.Drawing.Size size)
{
using (var dialog = new Form())
{
var browesr = new WebBrowser()
{
Dock = DockStyle.Fill
};

var token = m_DropNetClient.GetToken();
var authUrl = m_DropNetClient.BuildAuthorizeUrl();
browesr.Navigated += (s, ex) =>
{
var url = ex.Url.ToString();
if (url.Equals(callbackUrl))
{
dialog.DialogResult = DialogResult.OK;
}
else if (url.Equals(cancelCallbackUrl))
{
dialog.DialogResult = DialogResult.Cancel;
}
};
browesr.Navigate(authUrl);

dialog.Size = size;
dialog.Controls.Add(browesr);

return dialog.ShowDialog();
}
}

private void tbxAppKey_TextChanged(object sender, EventArgs e)
{
m_DropNetClient = null;
}
}
}