(Visual FoxPro) Hotmail Refresh Access Token (also for Live.com, Outlook.com)

See more OAuth2 Examples

An OAuth2 access token is typically valid for 1 hour. Interaction with the Hotmail account owner via a browser is only needed for getting the initial access token. Once you have it, it can be continually refreshed without user interaction for a long time.

See: How Long can an OAuth2 Access Token be Refreshed?

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loJsonToken
LOCAL lnSuccess
LOCAL loOauth2
LOCAL loSbJson

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

* It is assumed we previously obtained an OAuth2 access token.

* Note: Refreshing an access token does not require user-interaction.  
* Only the act of getting the initial access token requires interactive authorization from the Hotmail account owner 
* (i.e. a browser is displayed and the Hotmail account owner authorizes access by the app).

* Once you have the initial access token, it can be refreshed for a long time.
* A typical strategy is to write your application to automatically refresh the access token 
* when authentication fails, and then retry the operation with the new access token.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/hotmail.json")
IF (lnSuccess <> 1) THEN
    ? "Failed to load office365.json"
    RELEASE loJsonToken
    CANCEL
ENDIF

* The access token JSON looks like this:

* {
*   "token_type": "Bearer",
*   "scope": "https://outlook.office.com/SMTP.Send https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/POP.AccessAsUser.All",
*   "expires_in": 3600,
*   "ext_expires_in": 3600,
*   "access_token": "EwBoA+ ... 7pOYcWr5pFwQgI=",
*   "refresh_token": "M.C546_BL2.0.U.-CkW ... g5CKSlDBQ$$",
*   "id_token": "eyJ0e ... 2iiu5iqBK9n7s3A"
* }

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2 = CreateObject('Chilkat.OAuth2')

* See Microsoft OAuth2 Authorization Endpoint
loOauth2.TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token"

* Replace this with your actual App Registration's Application (client) ID.
loOauth2.ClientId = "CLIENT_ID"

* Get the "refresh_token"
loOauth2.RefreshToken = loJsonToken.StringOf("refresh_token")

* Send the HTTP POST to refresh the access token..
lnSuccess = loOauth2.RefreshAccessToken()
IF (lnSuccess <> 1) THEN
    ? loOauth2.LastErrorText
    RELEASE loJsonToken
    RELEASE loOauth2
    CANCEL
ENDIF

? loOauth2.LastErrorText

? "New access token: " + loOauth2.AccessToken
? "New refresh token: " + loOauth2.RefreshToken

* Update the JSON with the new tokens.
loJsonToken.UpdateString("access_token",loOauth2.AccessToken)
loJsonToken.UpdateString("refresh_token",loOauth2.RefreshToken)

* Save the new JSON access token response to a file.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJson = CreateObject('Chilkat.StringBuilder')
loJsonToken.EmitCompact = 0
loJsonToken.EmitSb(loSbJson)
loSbJson.WriteFile("qa_data/tokens/hotmail.json","utf-8",0)

? "OAuth2 authorization granted!"
? "New Access Token = " + loOauth2.AccessToken

RELEASE loJsonToken
RELEASE loOauth2
RELEASE loSbJson