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gAuth2.cls
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gAuth2.cls
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' ================================================================================== '
'
' OAuth 2.0 Google Authenticator
' Developed by Kyle Beachill
' licence: MIT (http://www.opensource.org/licenses/mit-license.php)
'
' Inspired loosely by Tim Halls authentication classes in his Excel-Rest library:
' https://github.com/timhall/Excel-REST
' modified by Dang Dinh Ngoc with inclusion of WinhttpRequest protocol on replacement of InternetExplorer
' Vietnam 2015
'
' Features:
' Simple class to handle Google OAuth 2.0 Authentication
' Follows the Installed Application Flow
' Returns Simply the value for the Authorization header in API requests
'
' Gotchas:
' Tokens are held in plain text in the registry
'
' Required References:
' - Microsoft Internet Controls ' no longer need
' - Microsoft XML
'
' ================================================================================== '
Option Compare Database
Option Explicit
Public Event StatusChanged(ByVal Status As String)
'// Simple enum for current authentication status
Private Enum AuthenticationStatus
NotAuthenticated = 1
TokenExpired = 2
Authenticated = 3
End Enum
Private Enum HtmlElementType
ById = 0
ByName = 1
ByClassName = 2
ByTagName = 3
End Enum
'// Application Client ID and Application Secret
Private strClientId As String
Private strClientSecret As String
'// Authentication codes, tokens and expiry date
Private strTokenKey As String
Private strToken As String
Private strRefreshToken As String
' this is a temporary key for using if missing
Private tmpstrRefreshToken As String
Private dtExpiresWhen As Date
Private strAuthCode As String
'// Url End points for the authentication
Private strAuthUrl As String
Private strTokenUrl As String
Private strRedirectUri As String
'// Internet Explorer variables for initial authentication request
Private oIExplorer As Object
Private strResponseText As String
Private oResponse As Object
'// Save the request object to prevent being created for each token expiry
Private objXMLRequest As Object
Private Const WAIT_TIMEOUT = 300
Private Const ERR_TIMEOUT = 1000
Private Const READYSTATE_COMPLETE = 4
Private Const PAGE_LOADED = 4
Private Xhr As Object
Private LogonCookie As Variant
'// Since we are persisting the credentials to the registry, we need to read these in each time the class
'// is initialized, if they aren't found - these will be default values, "" for strings and 1900/01/01 for te date
Private Sub Class_Initialize()
Dim sDate As String
strToken = GetSetting("GoogleAuth", "Tokens", "Token")
strRefreshToken = GetSetting("GoogleAuth", "Tokens", "RefreshKey")
sDate = GetSetting("GoogleAuth", "Tokens", "TokenExpiry")
If Len(sDate) > 0 Then
dtExpiresWhen = CDate(sDate)
Else
dtExpiresWhen = #1/1/1900#
End If
End Sub
'// Allows the overriding of the default google EndPoints - these are unlikely to change
Public Sub InitEndPoints( _
Optional ByVal AuthUrl As String = "https://accounts.google.com/o/oauth2/auth", _
Optional ByVal TokenUrl As String = "https://accounts.google.com/o/oauth2/token", _
Optional ByVal RedirectUri As String = "urn:ietf:wg:oauth:2.0:oob" _
)
strAuthUrl = AuthUrl
strTokenUrl = TokenUrl
strRedirectUri = RedirectUri
End Sub
'// Application ID and Secret will always need passing, since they are required for refresh calls
'// Though these *could* be persisted in the registry also
Public Sub InitClientCredentials(ByVal ClientId As String, ByVal ClientSecret As String, Optional TmpRefeshKey As String = "")
strClientId = ClientId
strClientSecret = ClientSecret
tmpstrRefreshToken = TmpRefeshKey
' using application temporary key
If strRefreshToken = "" Then strRefreshToken = tmpstrRefreshToken
End Sub
'// Simple function to return the authentication status of the currently held credentials
Private Function getAuthenticationStatus() As AuthenticationStatus
'// If the Refresh Token Length is 0 then the initial authentication hasn't occurred
If Len(strRefreshToken) = 0 Then
getAuthenticationStatus = NotAuthenticated
Exit Function
End If
'// If the refresh date is less than now (with a 10 second buffer) then the token has expired
If dtExpiresWhen < DateAdd("s", 10, Now()) Then
getAuthenticationStatus = TokenExpired
Exit Function
End If
'// Otherwise the token is valid
getAuthenticationStatus = Authenticated
End Function
Function LoginGoogle(gAccountName As String, gPassword As String) As Boolean
Dim oHttp As Object, sHTML As String
Dim google_accounts_url As String, authentication_url As String, gmailUrl As String, i As Long
Dim d As String, google_accounts_logout
google_accounts_logout = "https://accounts.google.com/Logout?service=accountsettings"
google_accounts_url = "http://accounts.google.com"
authentication_url = "https://accounts.google.com/ServiceLoginAuth"
gmailUrl = "https://mail.google.com/mail/"
GetWebConnector True
Set oHttp = Xhr
Dim Cookie As Variant, UserDetails As String
With oHttp
' Log out all first
.Open "POST", google_accounts_logout, False
.Send
RaiseEvent StatusChanged(Msg("MSG_LOG_OUT_ALL_ACCOUNTS"))
If .Status <> 200 Then GoTo Exit_Sub
' now release a get request
.Open "GET", google_accounts_url, False
.Send
RaiseEvent StatusChanged(Msg("MSG_SEND_REQUEST_FOR_LOGGING_IN"))
If .Status <> 200 Then GoTo Exit_Sub
'Debug.Print .getAllResponseHeaders()
'Cookie = Split(.getResponseHeader("Set-Cookie"), ";")
d = "&GALX=" + GetResponseData(.ResponseText, "GALX", , 0)
d = d + "&continue=https://www.google.com/?gws_rd=ssl&hl=en&_utf8=?"
d = d + "&bgresponse=js_disabled&pstMsg=1&dnConn=&checkConnection=youtube:206:1"
d = d + "&checkedDomains=youtube"
d = d + "&Email=" + gAccountName + "&Passwd=" + gPassword
d = d + "&PersistentCookie=Yes&signIn=Sign in"
.Open "POST", authentication_url, False
.SetRequestHeader "Content-type", "application/x-www-form-urlencoded"
.SetRequestHeader "User-Agent", VbAgent '"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"
.SetRequestHeader "Host", "accounts.google.com"
.SetRequestHeader "Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
.SetRequestHeader "Accept-Language", "en-US,en;q=0.5"
'For i = 0 To UBound(Cookie)
' .setRequestHeader "Cookie", Cookie(i)
'Next
.SetRequestHeader "Connection", "keep-alive"
.SetRequestHeader "Referer", "https://accounts.google.com/ServiceLoginAuth"
.SetRequestHeader "Content-Length", Len(d)
.Send (Utf8BytesFromString(d))
RaiseEvent StatusChanged(Msg("MSG_SUBMITTED_USER_DATA"))
If .Status <> 200 Then GoTo Exit_Sub
'WriteLog .ResponseText, "C:\Logged_account.html", True
' now check for logiing in
d = GetResponseData(.ResponseText, "gaia_loginform", "action", 0)
If d = "" Then
If GetResponseData(.ResponseText, "title", , 3) = "Google Accounts" Or InStr(.ResponseText, gAccountName) > 0 Then
RaiseEvent StatusChanged(Msg("MSG_LOGGED_IN"))
LoginGoogle = True
GoTo Exit_Sub
End If
Else
' Check for what was the message
d = GetResponseData(.ResponseText, "errormsg_0_Email", , 0, True)
If d <> "" Then GoTo Exit_With_Error
' password or email problem
d = GetResponseData(.ResponseText, "errormsg_0_Passwd", "innerHtml", 0, True)
End If
End With
Exit_With_Error:
RaiseEvent StatusChanged(Msg("MSG_LOG_IN_FAILED") + " [" + d + "]")
Exit_Sub:
End Function
Private Function GetResponseData(ResponseText As String, ItemID As String, _
Optional PropertyType As String = "value", Optional ItemType As HtmlElementType = 0, _
Optional GetFirstChildElement As Boolean = False)
' This function will check whether the surfing was successfully or not?
Dim htmlDoc As Object, FindElement As Object, tmpObj As String
Set htmlDoc = CreateObject("HtmlFile")
' Load the html object
htmlDoc.Write ResponseText
htmlDoc.Close
With htmlDoc
Select Case ItemType
Case 0: ' by id
Set FindElement = .getElementById(ItemID)
Case 1: ' by name
Case 2: ' by class
Set FindElement = .getElementsByClassName(ItemID)
Case 3: ' by TagName
' jst dont know why every time using by tagname IE show up
GetResponseData = htmlDoc.title
'Set FindElement = .getElementsByTagName(ItemID)
End Select
End With
If FindElement Is Nothing Then
' not existent - succesffully or mightbe not
Else
On Error Resume Next
' first - try to get its property if we can
GetResponseData = FindElement.getAttribute(PropertyType)
If GetFirstChildElement Then
If FindElement.hasChildNodes Then
GetResponseData = FindElement.firstChild.getAttribute(PropertyType)
While FindElement.children.Length >= 1
FindElement.removeChild (FindElement.lastChild)
Wend
If FindElement.getAttribute(PropertyType) <> "" Then GetResponseData = FindElement.getAttribute(PropertyType)
End If
End If
End If
If Err.Number <> 0 Then Err.clear
Set htmlDoc = Nothing
End Function
Sub LogOnGoogle(gAccount As String, gPassword As String)
GetWebConnector
' Log out all first
RaiseEvent StatusChanged(Msg("MSG_LOG_OUT_ALL_ACCOUNTS"))
SurfAndWait oIExplorer, "https://accounts.google.com/Logout?service=accountsettings"
'Browse to service login
SurfAndWait oIExplorer, "https://accounts.google.com/ServiceLogin"
If ElementAvaiable(oIExplorer, "account-chooser-add-account") Then
'Choose add acount
ClickButton oIExplorer, "account-chooser-add-account"
SurfAndWait oIExplorer, , True
End If
'Check for type of loging system
With oIExplorer
'enter email
.Document.all.Email.Value = gAccount
If Not ElementAvaiable(oIExplorer, "Passwd") Then
' two step logging in
ClickButton oIExplorer, "next"
SurfAndWait oIExplorer, , True
.Document.all.Passwd.Value = gPassword
Else
.Document.all.Passwd.Value = gPassword
End If
' submit and wait
Call oIExplorer.Document.all.gaia_loginform.submit
End With
RaiseEvent StatusChanged(Msg("MSG_LOGGED_IN"))
SurfAndWait oIExplorer, , True
End Sub
Private Sub SurfAndWait(ieObject As Object, Optional url As String, _
Optional SkipSurfing As Boolean = False, _
Optional GetTitle As Boolean = False)
If Not SkipSurfing Then Call oIExplorer.Navigate(url)
If Not GetTitle Then Do: DoEvents: Loop Until WaitUntilLoaded Else Do: DoEvents: Loop Until BrowserComplete
End Sub
Private Function WaitUntilLoaded() As Boolean
Dim i, j, ready
' wait for page to connect
i = 0
Do Until oIExplorer.readyState = READYSTATE_COMPLETE
Sleep 100
i = i + 1
If i > WAIT_TIMEOUT Then Err.Raise ERR_TIMEOUT, , "Timeout"
Loop
' wait for document to load
Do Until oIExplorer.Document.readyState = "complete"
Sleep 100
i = i + 1
If i > WAIT_TIMEOUT Then Err.Raise ERR_TIMEOUT, , "Timeout"
Loop
WaitUntilLoaded = True
End Function
Function GetAuthorisationCode(url As String) As String
Dim oDOM As Object, frmAction As Object
Dim ApproveUrl As String, d As String, i As Long, Cookie As Variant
Dim tmpStr As String, xPos1 As Long, xPos2 As Long
With Xhr
' Navigate the consent windows
.Open "GET", url, False
.Send
If .Status <> 200 Then GoTo Exit_Sub
' Get the submited address
ApproveUrl = GetResponseData(.ResponseText, "connect-approve", "action")
d = "&bgresponse=''&_utf8=" + ChrW(9731)
d = d + "&state_wrapper=" + GetResponseData(.ResponseText, "state_wrapper")
d = d + "&submit_access=true"
d = d + "&valuenow=true"
.Open "POST", ApproveUrl, False
.SetRequestHeader "Accept", "text/html, application/xhtml+xml, */*"
'.SetRequestHeader "Accept-Encoding", "gzip, deflate"
.SetRequestHeader "Accept-Language", "en-US"
'.setRequestHeader "Accept-Language", "en-US,en;q=0.5"
.SetRequestHeader "Cache-Control", "no-cache"
.SetRequestHeader "Connection", "Keep-Alive"
.SetRequestHeader "Content-Length", Len(d)
.SetRequestHeader "Content-type", "application/x-www-form-urlencoded"
.SetRequestHeader "Host", "accounts.google.com"
.SetRequestHeader "Referer", url
.SetRequestHeader "User-Agent", VbAgent
.Send (Utf8BytesFromString(d))
If .Status <> 200 Then GoTo Exit_Sub
GetAuthorisationCode = GetResponseData(.ResponseText, "code")
RaiseEvent StatusChanged(Msg("MSG_GOT_THE_CODE"))
End With
Exit_Sub:
Set oDOM = Nothing
End Function
Private Function Escape(ByVal url As String) As String
'URLs cannot contain most special characters.
'VBScript and JavaScript have built-in Escape functions. In VB we have to write our own
Dim i As Integer, BadChars As String
BadChars = "<>%=&!@#£$^()+{[}]|\;:'"",/?"
For i = 1 To Len(BadChars)
url = Replace(url, Mid(BadChars, i, 1), "%" & Hex(Asc(Mid(BadChars, i, 1))))
Next i
url = Replace(url, " ", "+")
Escape = url
End Function
Function GetNewToken() As Boolean
GetWebConnector True
'// Wait for userInteraction
'SurfAndWait oIExplorer, CreateAuthRequest(), , True
strAuthCode = GetAuthorisationCode(CreateAuthRequest())
'// Do we have an Authentication Code?
If Len(strAuthCode) = 0 Then Exit Function
With Xhr
.Open "POST", strTokenUrl, False
.SetRequestHeader "Content-Type", "application/x-www-form-urlencoded"
.Send CreateTokenRequest()
If .Status <> 200 Then Exit Function
'// Get the credentials from the response
strToken = GetProp("access_token", .ResponseText)
strRefreshToken = GetProp("refresh_token")
dtExpiresWhen = DateAdd("s", CLng(GetProp("expires_in")), Now())
End With
RaiseEvent StatusChanged(Msg("MSG_TOKEN_RENEWED"))
'// Persist the Refresh key and expiry - the above should only ever need running once per application
SaveSetting "GoogleAuth", "Tokens", "RefreshKey", strRefreshToken
SaveSetting "GoogleAuth", "Tokens", "Token", strToken
SaveSetting "GoogleAuth", "Tokens", "TokenExpiry", CStr(dtExpiresWhen)
GetNewToken = True
End Function
Function RefreshToken() As Boolean
GetWebConnector True
Dim url As String
url = CreateRefreshRequest()
With Xhr
.Open "POST", strTokenUrl, False
.SetRequestHeader "Content-Type", "application/x-www-form-urlencoded"
.Send url
If .Status <> 200 Then Exit Function
'// Get the credentials from the response
strToken = GetProp("access_token", .ResponseText)
dtExpiresWhen = DateAdd("s", CLng(GetProp("expires_in")), Now())
End With
RaiseEvent StatusChanged(Msg("MSG_TOKEN_REFRESHED"))
RefreshToken = True
'// Persist new token in registry
SaveSetting "GoogleAuth", "Tokens", "RefreshKey", strRefreshToken
SaveSetting "GoogleAuth", "Tokens", "Token", strToken
SaveSetting "GoogleAuth", "Tokens", "TokenExpiry", CStr(dtExpiresWhen)
End Function
'// Simple function that gets a propery from a single depth JSON formatted string
'// Requires the property name
'// Requires te JSON string on the first pass
Private Function GetProp(strPropName As String, Optional strJSObject As String = "") As String
Static oScriptControl As Object
If oScriptControl Is Nothing Then Set oScriptControl = CreateObject("ScriptControl")
With oScriptControl
.Language = "JScript"
.AddCode "function getProp(json, prop) { return json[prop]; }"
If Len(strJSObject) > 0 Then
strResponseText = strJSObject
Set oResponse = .eval("(" & strJSObject & ")")
End If
GetProp = .Run("getProp", oResponse, strPropName)
End With
End Function
'// Public property to return the Authorisation value header for a request
Public Property Get AuthHeader() As String
Dim eAuthStatus As AuthenticationStatus
eAuthStatus = getAuthenticationStatus
If eAuthStatus = NotAuthenticated Then
Call GetNewToken
ElseIf eAuthStatus = TokenExpired Then
RefreshToken
End If
AuthHeader = "Bearer " & strToken
End Property
'//===========================================================================================================
'// String building functions for the requests
'// Step 1: The initial url for authentication - Note the scope attribute, this sets what the application can access
Private Function CreateAuthRequest() As String
' Generate initial Authentication Request
' Using installed application flow: https://developers.google.com/accounts/docs/OAuth2InstalledApp
CreateAuthRequest = strAuthUrl
If InStr(1, CreateAuthRequest, "?") < 1 Then: CreateAuthRequest = CreateAuthRequest & "?"
CreateAuthRequest = CreateAuthRequest & "client_id=" & strClientId
CreateAuthRequest = CreateAuthRequest & "&redirect_uri=" & strRedirectUri
CreateAuthRequest = CreateAuthRequest & "&response_type=code"
CreateAuthRequest = CreateAuthRequest & "&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fdrive&state=state"
End Function
'// Step 2: The initial POST body to get the initial Token and refresh token
Private Function CreateTokenRequest() As String
CreateTokenRequest = "code=" & strAuthCode
CreateTokenRequest = CreateTokenRequest & "&client_id=" & strClientId
CreateTokenRequest = CreateTokenRequest & "&client_secret=" & strClientSecret
CreateTokenRequest = CreateTokenRequest & "&redirect_uri=" & strRedirectUri
CreateTokenRequest = CreateTokenRequest & "&grant_type=authorization_code"
End Function
'// Step 3: The POST body to refresh a token after it has expired
Private Function CreateRefreshRequest() As String
CreateRefreshRequest = "client_id=" & strClientId
CreateRefreshRequest = CreateRefreshRequest & "&client_secret=" & strClientSecret
CreateRefreshRequest = CreateRefreshRequest & "&refresh_token=" & strRefreshToken
CreateRefreshRequest = CreateRefreshRequest & "&grant_type=refresh_token"
End Function
Private Function CreateLoginRequest()
'https. //accounts.google.com/o/oauth2/auth?client_id=XXXXXXXXXXXXXXXXXXXXXXXXXXXX&response_type=code&scope=openid%20profile%20email&redirect_uri=urn. ietf. wg. oauth. 2.0. oob&login_hint=myemail@gmail.
CreateLoginRequest = "https://accounts.google.com/ServiceLogin?"
CreateLoginRequest = CreateLoginRequest & "client_id=" & strClientId
CreateLoginRequest = CreateLoginRequest & "&refresh_token=" & strRefreshToken
CreateLoginRequest = CreateLoginRequest & "&grant_type=refresh_token"
End Function
'//===========================================================================================================
'// Event handling for Internet Explorer Object
'// OAuth 2.0 Process flow requires a user to provide access through the browser for initial Authentication
'//Check the title Window, if Success or Denied Found End the IE interaction
Property Get BrowserComplete() As Boolean
' Try to wait until ie is completed processing
BrowserComplete = WaitUntilLoaded()
Dim theText As String
theText = oIExplorer.Document.title
If InStr(1, theText, "Success") > 0 Then
strAuthCode = oIExplorer.Document.getElementById("code").Value
RaiseEvent StatusChanged(Msg("MSG_QUIT_IEXPLORER"))
oIExplorer.Quit
ElseIf InStr(1, theText, "Denied") > 0 Then
oIExplorer.Quit
Else
'// Click a button then
ClickButton oIExplorer, "submit_approve_access"
BrowserComplete = False
RaiseEvent StatusChanged(Msg("MSG_GOT_THE_CODE"))
End If
End Property
'//Only return the AuthCode and then move on the next process..
Public Property Get AuthCode() As String
GetWebConnector
'// Wait for userInteraction
SurfAndWait oIExplorer, CreateAuthRequest()
'// Do we have an Authentication Code?
If Len(strAuthCode) = 0 Then Err.Raise vbObjectError + 2, Description:="User cancelled Authentication"
AuthCode = strAuthCode
End Property
Private Function ElementAvaiable(ieObject As Object, BtnId As String) As Boolean
' check for an element is exist or not
On Error GoTo ErrHandler
Dim goBtn As Object
Set goBtn = ieObject.Document.getElementById(BtnId)
If goBtn Is Nothing Then GoTo ErrHandler
ElementAvaiable = True
Set goBtn = Nothing
ErrHandler:
End Function
Private Sub ClickButton(ieObject As Object, BtnId As String)
' for clicking a button when required
Dim goBtn As Object
Set goBtn = ieObject.Document.getElementById(BtnId)
goBtn.Click
End Sub
Private Sub Class_Terminate()
On Error Resume Next
If Not oIExplorer Is Nothing Then
' only kill what we created
oIExplorer.Quit
Set oIExplorer = Nothing
End If
Set Xhr = Nothing
End Sub
Private Sub GetWebConnector(Optional ActiveXmlObjectOnly = False)
'If Xhr Is Nothing Then Set Xhr = CreateObject("MSXML2.ServerXMLHTTP")
If Xhr Is Nothing Then Set Xhr = CreateObject("WinHttp.WinHttpRequest.5.1")
If ActiveXmlObjectOnly Then Exit Sub
Dim str As String
On Error GoTo ErrHandler
str = oIExplorer.Document.title
Exit Sub
ErrHandler:
Set oIExplorer = CreateObject("InternetExplorer.Application")
' just sleep 1 second for stuff to be done
Sleep 1000
With oIExplorer
.AddressBar = False
.MenuBar = False
.Resizable = False
.Visible = False
End With
End Sub