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PureBasic Examples

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(PureBasic) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkFileAccess.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkOAuth2.pb"

Procedure ChilkatExample()

    success.i = 1

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

    ;  This example uses a previously obtained access token having permission for the
    ;  Google Drive scope.

    ;  The access token (and refresh token) was previously saved to a JSON file with this format:
    ;  See Get Google Drive OAuth2 Access Token

    ;  {
    ;    "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
    ;    "expires_in": 3600,
    ;    "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
    ;    "scope": "https://www.googleapis.com/auth/drive",
    ;    "token_type": "Bearer"
    ;  }

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

    tokenFilePath.s = "qa_data/tokens/googleDrive.json"
    CkJsonObject::ckLoadFile(json,tokenFilePath)

    oauth2.i = CkOAuth2::ckCreate()
    If oauth2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkOAuth2::setCkAccessToken(oauth2, CkJsonObject::ckStringOf(json,"access_token"))
    CkOAuth2::setCkRefreshToken(oauth2, CkJsonObject::ckStringOf(json,"refresh_token"))

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

    ;  Connect using TLS.
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"www.googleapis.com",443,1,bAutoReconnect)

    ;  Provide the authentication credentials (i.e. the access token)
    CkRest::ckSetAuthOAuth2(rest,oauth2)

    ;  We'll test with a simple request to empty trash.
    ;  If our access token expired, we'll get a 401 response..
    jsonResponse.s = CkRest::ckFullRequestNoBody(rest,"DELETE","/drive/v3/files/trash")
    If CkRest::ckLastMethodSuccess(rest) <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkJsonObject::ckDispose(json)
        CkOAuth2::ckDispose(oauth2)
        CkRest::ckDispose(rest)
        ProcedureReturn
    EndIf

    ;  If the access token expired, we'll get a 401 response status with this response body:
    ;  {
    ;   "error": {
    ;    "errors": [
    ;     {
    ;      "domain": "global",
    ;      "reason": "authError",
    ;      "message": "Invalid Credentials",
    ;      "locationType": "header",
    ;      "location": "Authorization"
    ;     }
    ;    ],
    ;    "code": 401,
    ;    "message": "Invalid Credentials"
    ;   }
    ;  }
    If CkRest::ckResponseStatusCode(rest) = 401

        Debug "Refreshing access token..."

        CkOAuth2::setCkAuthorizationEndpoint(oauth2, "https://accounts.google.com/o/oauth2/v2/auth")
        CkOAuth2::setCkTokenEndpoint(oauth2, "https://www.googleapis.com/oauth2/v4/token")

        ;   Replace these with actual values.
        CkOAuth2::setCkClientId(oauth2, "GOOGLE-CLIENT-ID")
        CkOAuth2::setCkClientSecret(oauth2, "GOOGLE-CLIENT-SECRET")
        CkOAuth2::setCkScope(oauth2, "https://www.googleapis.com/auth/drive")

        ;  Use OAuth2 to refresh the access token.
        success = CkOAuth2::ckRefreshAccessToken(oauth2)
        If success <> 1
            Debug CkOAuth2::ckLastErrorText(oauth2)
            CkJsonObject::ckDispose(json)
            CkOAuth2::ckDispose(oauth2)
            CkRest::ckDispose(rest)
            ProcedureReturn
        EndIf

        ;  Save the new access token and refresh token to our XML file (so we can refresh it again when needed).
        CkJsonObject::ckUpdateString(json,"access_token",CkOAuth2::ckAccessToken(oauth2))
        CkJsonObject::ckUpdateString(json,"refresh_token",CkOAuth2::ckRefreshToken(oauth2))
        fac.i = CkFileAccess::ckCreate()
        If fac.i = 0
            Debug "Failed to create object."
            ProcedureReturn
        EndIf

        CkFileAccess::ckWriteEntireTextFile(fac,tokenFilePath,CkJsonObject::ckEmit(json),"utf-8",0)

        Debug "Access Token Refreshed!"

        ;  Retry the request with the new access token..
        jsonResponse = CkRest::ckFullRequestNoBody(rest,"DELETE","/drive/v3/files/trash")
        If CkRest::ckLastMethodSuccess(rest) <> 1
            Debug CkRest::ckLastErrorText(rest)
            CkJsonObject::ckDispose(json)
            CkOAuth2::ckDispose(oauth2)
            CkRest::ckDispose(rest)
            CkFileAccess::ckDispose(fac)
            ProcedureReturn
        EndIf

    EndIf

    ;  A successful response will have a status code equal to 204 and the response body is empty.
    ;  (If not successful, then there should be a JSON response body with information..)
    If CkRest::ckResponseStatusCode(rest) <> 204
        Debug "response status code = " + Str(CkRest::ckResponseStatusCode(rest))
        Debug "response status text = " + CkRest::ckResponseStatusText(rest)
        Debug "response header: " + CkRest::ckResponseHeader(rest)
        Debug "response JSON: " + jsonResponse
        CkJsonObject::ckDispose(json)
        CkOAuth2::ckDispose(oauth2)
        CkRest::ckDispose(rest)
        CkFileAccess::ckDispose(fac)
        ProcedureReturn
    EndIf

    Debug "Trash Emptied!"


    CkJsonObject::ckDispose(json)
    CkOAuth2::ckDispose(oauth2)
    CkRest::ckDispose(rest)
    CkFileAccess::ckDispose(fac)


    ProcedureReturn
EndProcedure

 

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