(PureBasic) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkFileAccess.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkHttpRequest.pb"

Procedure ChilkatExample()

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

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkJsonObject::ckLoadFile(json,"qa_data/tokens/msGraphCalendar.json")
    If success <> 1
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

    req.i = CkHttpRequest::ckCreate()
    If req.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttpRequest::ckAddParam(req,"grant_type","refresh_token")
    CkHttpRequest::ckAddParam(req,"redirect_uri","http://localhost:3017/")
    CkHttpRequest::ckAddParam(req,"client_id","MICROSOFT-GRAPH-CLIENT-ID")
    CkHttpRequest::ckAddParam(req,"client_secret","MICROSOFT-GRAPH-CLIENT-SECRET")
    CkHttpRequest::ckAddParam(req,"refresh_token",CkJsonObject::ckStringOf(json,"refresh_token"))
    CkHttpRequest::ckAddParam(req,"scope","openid profile offline_access user.readwrite calendars.readwrite files.readwrite")

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    resp.i = CkHttp::ckPostUrlEncoded(http,"https://login.microsoftonline.com/common/oauth2/v2.0/token",req)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkJsonObject::ckDispose(json)
        CkHttpRequest::ckDispose(req)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    ; Load the JSON response.
    CkJsonObject::ckLoad(json,CkHttpResponse::ckBodyStr(resp))
    CkJsonObject::setCkEmitCompact(json, 0)

    ; Show the JSON response.
    Debug CkJsonObject::ckEmit(json)

    Debug "Response status code: " + Str(CkHttpResponse::ckStatusCode(resp))

    ; If the response status code is not 200, then it's an error.
    If CkHttpResponse::ckStatusCode(resp) <> 200
        CkJsonObject::ckDispose(json)
        CkHttpRequest::ckDispose(req)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    CkHttpResponse::ckDispose(resp)

    ; Save the refreshed access token JSON to a file for future requests.
    fac.i = CkFileAccess::ckCreate()
    If fac.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkFileAccess::ckWriteEntireTextFile(fac,"qa_data/tokens/msGraphCalendar.json",CkJsonObject::ckEmit(json),"utf-8",0)

    Debug "Success."


    CkJsonObject::ckDispose(json)
    CkHttpRequest::ckDispose(req)
    CkHttp::ckDispose(http)
    CkFileAccess::ckDispose(fac)


    ProcedureReturn
EndProcedure