(DataFlex) POP3 Auto-Refresh Office365 Access Token

See more Office365 Examples

Demonstrates how to automatically recover from an expired OAuth2 access token when OAuth2 authentication fails in the POP3 protocol. If the server responds with "-ERR Authentication failure: unknown user name or bad password.", then we refresh the access token and retry.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoMailman
    Handle hoJsonToken
    Boolean iSuccess
    Handle hoOauth2
    Variant vSbJson
    Handle hoSbJson
    Integer iNumEmails
    String sTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    Set ComMailHost Of hoMailman To "outlook.office365.com"
    Set ComMailPort Of hoMailman To 995
    Set ComPopSsl Of hoMailman To True

    // Use your O365 email address here.
    Set ComPopUsername Of hoMailman To "OFFICE365_EMAIL_ADDRESS"

    // When using OAuth2 authentication, leave the password empty.
    Set ComPopPassword Of hoMailman To ""

    // Load our previously obtained OAuth2 access token.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonToken
    If (Not(IsComObjectCreated(hoJsonToken))) Begin
        Send CreateComObject of hoJsonToken
    End
    Get ComLoadFile Of hoJsonToken "qa_data/tokens/office365.json" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJsonToken To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStringOf Of hoJsonToken "access_token" To sTemp1
    Set ComOAuth2AccessToken Of hoMailman To sTemp1

    // Make the TLS connection to the outlook.office365.com POP3 server.
    Get ComPop3Connect Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Authenticate using XOAUTH2
    Get ComPop3Authenticate Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        // If we're still connected to the mail server, then it means the server sent a non-success response,
        // Such as:  -ERR Authentication failure: unknown user name or bad password.
        Get ComIsPop3Connected Of hoMailman To bTemp1
        If (bTemp1 = True) Begin

            // Refresh the OAuth2 access token, and if successful, save the new (refreshed) access token and try authenticating again.
            Get Create (RefClass(cComChilkatOAuth2)) To hoOauth2
            If (Not(IsComObjectCreated(hoOauth2))) Begin
                Send CreateComObject of hoOauth2
            End

            // Use your actual Directory (tenant) ID instead of "112d7ed6-71bf-4eba-a866-738364321bfc"
            Set ComTokenEndpoint Of hoOauth2 To "https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token"

            // Replace these with your Azure App Registration's actual values.
            Set ComClientId Of hoOauth2 To "CLIENT_ID"
            Set ComClientSecret Of hoOauth2 To "CLIENT_SECRET"

            // Get the "refresh_token"
            Get ComStringOf Of hoJsonToken "refresh_token" To sTemp1
            Set ComRefreshToken Of hoOauth2 To sTemp1

            // Send the HTTP POST to refresh the access token..
            Get ComRefreshAccessToken Of hoOauth2 To iSuccess
            If (iSuccess <> True) Begin
                Get ComLastErrorText Of hoOauth2 To sTemp1
                Showln sTemp1
                Procedure_Return
            End

            Get ComAccessToken Of hoOauth2 To sTemp1
            Showln "New access token: " sTemp1
            Get ComRefreshToken Of hoOauth2 To sTemp1
            Showln "New refresh token: " sTemp1

            // Update the JSON with the new tokens.
            Get ComAccessToken Of hoOauth2 To sTemp1
            Get ComUpdateString Of hoJsonToken "access_token" sTemp1 To iSuccess
            Get ComRefreshToken Of hoOauth2 To sTemp1
            Get ComUpdateString Of hoJsonToken "refresh_token" sTemp1 To iSuccess

            // Save the new JSON access token response to a file.
            Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJson
            If (Not(IsComObjectCreated(hoSbJson))) Begin
                Send CreateComObject of hoSbJson
            End
            Set ComEmitCompact Of hoJsonToken To False
            Get pvComObject of hoSbJson to vSbJson
            Get ComEmitSb Of hoJsonToken vSbJson To iSuccess
            Get ComWriteFile Of hoSbJson "qa_data/tokens/office365.json" "utf-8" False To iSuccess

            Get ComAccessToken Of hoOauth2 To sTemp1
            Showln "New Access Token = " sTemp1

            // Update the mailman with the new access token.
            Get ComAccessToken Of hoOauth2 To sTemp1
            Set ComOAuth2AccessToken Of hoMailman To sTemp1

            // Retry the authentication.
            Get ComPop3Authenticate Of hoMailman To iSuccess
            If (iSuccess = False) Begin
                Get ComLastErrorText Of hoMailman To sTemp1
                Showln sTemp1
                Procedure_Return
            End

        End
        Else Begin
            Get ComLastErrorText Of hoMailman To sTemp1
            Showln sTemp1
            Procedure_Return
        End

    End

    // Find out how many emails are on the server..
    Get ComCheckMail Of hoMailman To iNumEmails
    If (iNumEmails < 0) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Examine the POP3 session log:
    Get ComPop3SessionLog Of hoMailman To sTemp1
    Showln sTemp1

    // The POP3 session log will look something like this:

    // **** Connected to outlook.office365.com:995
    // < +OK The Microsoft Exchange POP3 service is ready. [QwBIADIAUABSADEANgBDAEEAMAAwADEAMgAuAG4AYQBtAHAAcgBkADEANgAuAHAAcgBvAGQALgBvAHUAdABsAG8AbwBrAC4AYwBvAG0A]
    // > AUTH XOAUTH2
    // < + 
    // > <base64 string in XOAUTH2 format>
    // < -ERR Authentication failure: unknown user name or bad password.
    // > AUTH XOAUTH2
    // < + 
    // > <base64 string in XOAUTH2 format>
    // < +OK User successfully authenticated.
    // > STAT
    // < +OK 248 46637086

    // End the POP3 session and close the connection to the GMail server.
    Get ComPop3EndSession Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Finished."


End_Procedure