Xbase++ Requires Chilkat v10.1.2+

OAuth2 using an HTTP Proxy (for a Desktop Application)

See more OAuth2 Examples

Shows how to send OAuth2 communications through an HTTP proxy in a desktop application, using Microsoft Graph as an example. This method applies to all OAuth2 applications. Xbase++

LOCAL nSuccess
LOCAL oSocket
LOCAL oOauth2
LOCAL cUrl
LOCAL nNumMsWaited
LOCAL oJson
LOCAL oDtExpire
LOCAL oFac

nSuccess := 0

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  To use an HTTP proxy with OAuth2, create a Chilkat socket object and specify the details.
oSocket := CreateObject("Chilkat.Socket")
//  Use your HTTP proxy server domain or IP address.
oSocket:HttpProxyHostname := "myproxyserver.com"
//  Change this to the listening port of your HTTP proxy server (if necessary)
oSocket:HttpProxyPort := 808
//  Specify login/password if needed.
oSocket:HttpProxyUsername := "myProxyLogin"
oSocket:HttpProxyPassword := "myProxyPassword"
oSocket:HttpProxyForHttp := 1

oOauth2 := CreateObject("Chilkat.OAuth2")

//  We don't need to connect the socket beforehand.
//  Just tell oauth2 to use the socket which has the HTTP proxy properties.
nSuccess := oOauth2:UseConnection(oSocket)

//  This should be the port in the localhost callback URL for your app.  
//  The callback URL would look like "http://localhost:3017/" if the port number is 3017.
oOauth2:ListenPort := 3017

oOauth2:AuthorizationEndpoint := "https://login.microsoftonline.com/common/oauth2/v2.0/authorize"
oOauth2:TokenEndpoint := "https://login.microsoftonline.com/common/oauth2/v2.0/token"

//  Replace these with actual values.
oOauth2:ClientId := "MICROSOFT-GRAPH-CLIENT-ID"
//  This is your app password:
oOauth2:ClientSecret := "MICROSOFT-GRAPH-CLIENT-SECRET"

oOauth2:CodeChallenge := 0
//  Provide a SPACE separated list of scopes.
//  See https://developer.microsoft.com/en-us/graph/docs/authorization/permission_scopes 

//  Important: To get a refresh token in the final response, you have to ask for "offline_access" scope
oOauth2:Scope := "openid profile offline_access user.readwrite mail.readwrite mail.send files.readwrite"

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
cUrl := oOauth2:StartAuth()
IF (oOauth2:LastMethodSuccess != 1)
    ? oOauth2:LastErrorText
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

? "url = " + cUrl

//  Launch the default browser on the system and navigate to the url.
//  The LaunchBrowser method was added in Chilkat v10.1.2.
nSuccess := oOauth2:LaunchBrowser(cUrl)
IF (nSuccess == 0)
    ? oOauth2:LastErrorText
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

//  Wait for the user to approve or deny authorization in the browser.
nNumMsWaited := 0
DO WHILE (nNumMsWaited < 90000) .AND. (oOauth2:AuthFlowState < 3)
    oOauth2:SleepMs(100)
    nNumMsWaited := nNumMsWaited + 100
ENDDO

//  If the browser does not respond within the specified time, AuthFlowState will be:
//  
//  1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
//  2: Waiting for Final Response - The thread is awaiting the final access token response.
//  In either case, cancel the background task initiated by StartAuth.

IF (oOauth2:AuthFlowState < 3)
    oOauth2:Cancel()
    ? "No response from the browser!"
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

//  Check AuthFlowState to determine if authorization was granted, denied, or failed:
//  
//  3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
//  4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
//  5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

IF (oOauth2:AuthFlowState == 5)
    ? "OAuth2 failed to complete."
    ? oOauth2:FailureInfo
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState == 4)
    ? "OAuth2 authorization was denied."
    ? oOauth2:AccessTokenResponse
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState != 3)
    ? "Unexpected AuthFlowState:" + Str(oOauth2:AuthFlowState)
    oSocket:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

? "OAuth2 authorization granted!"
? "Access Token = " + oOauth2:AccessToken

//  Get the full JSON response:
oJson := CreateObject("Chilkat.JsonObject")
oJson:Load(oOauth2:AccessTokenResponse)
oJson:EmitCompact := 0

//  The JSON response looks like this:

//  {
//    "token_type": "Bearer",
//    "scope": "User.Read Mail.ReadWrite Mail.Send",
//    "expires_in": 3600,
//    "ext_expires_in": 0,
//    "access_token": "EwBAA8l6B...",
//    "refresh_token": "MCRMdbe...",
//    "id_token": "eyJ0eXA..."
//  }

//  If an "expires_on" member does not exist, then add the JSON member by
//  getting the current system date/time and adding the "expires_in" seconds.
//  This way we'll know when the token expires.
IF (oJson:HasMember("expires_on") != 1)
    oDtExpire := CreateObject("Chilkat.CkDateTime")
    oDtExpire:SetFromCurrentSystemTime()
    oDtExpire:AddSeconds(oJson:IntOf("expires_in"))
    oJson:AppendString("expires_on", oDtExpire:GetAsUnixTimeStr(0))
ENDIF

? oJson:Emit()

//  Save the JSON to a file for future requests.
oFac := CreateObject("Chilkat.FileAccess")
oFac:WriteEntireTextFile("qa_data/tokens/microsoftGraph.json", oJson:Emit(), "utf-8", 0)

oSocket:destroy()
oOauth2:destroy()
oJson:destroy()
oDtExpire:destroy()
oFac:destroy()