(PureBasic) Refresh Schwab OAuth2 Access Token

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Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkOAuth2.pb"

Procedure ChilkatExample()

    success.i = 0

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

    ; See Get Schwab OAuth2 Access Token 
    ; for sample code showing how to obtain a Schwab access token for desktop apps.

    ; This example assumes we previously obtained an OAuth2 access token for Schwab.

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

    success = CkJsonObject::ckLoadFile(jsonToken,"qa_data/tokens/schwab-access-token.json")
    If success <> 1
        Debug "Failed to load schwab-access-token.json"
        CkJsonObject::ckDispose(jsonToken)
        ProcedureReturn
    EndIf

    ; The access token JSON looks something like this:

    ; {
    ;   "expires_in": 3600,
    ;   "x_refresh_token_expires_in": 8726400,
    ;   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    ;   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    ;   "token_type": "bearer"
    ; }

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

    CkOAuth2::setCkTokenEndpoint(oauth2, "https://api.schwabapi.com/v1/oauth/token")

    ; Replace these with actual values.
    CkOAuth2::setCkClientId(oauth2, "APP_KEY")
    CkOAuth2::setCkClientSecret(oauth2, "APP_SECRET")
    CkOAuth2::setCkUseBasicAuth(oauth2, 1)

    ; Get the "refresh_token"
    CkOAuth2::setCkRefreshToken(oauth2, CkJsonObject::ckStringOf(jsonToken,"refresh_token"))

    ; Send the HTTP POST to refresh the access token..
    success = CkOAuth2::ckRefreshAccessToken(oauth2)
    If success = 0
        Debug CkOAuth2::ckLastErrorText(oauth2)
        CkJsonObject::ckDispose(jsonToken)
        CkOAuth2::ckDispose(oauth2)
        ProcedureReturn
    EndIf

    ; The response contains a new access token, but we must keep
    ; our existing refresh token for when we need to refresh again in the future.
    CkJsonObject::ckUpdateString(jsonToken,"access_token",CkOAuth2::ckAccessToken(oauth2))

    ; Save the new JSON access token response to a file.
    ; The access + refresh tokens contained in this JSON will be needed for the next refresh.
    sbJson.i = CkStringBuilder::ckCreate()
    If sbJson.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(jsonToken, 0)

    CkJsonObject::ckEmitSb(jsonToken,sbJson)
    CkStringBuilder::ckWriteFile(sbJson,"qa_data/tokens/schwab-access-token.json","utf-8",0)

    Debug "OAuth2 token refreshed!"
    Debug "New Access Token = " + CkOAuth2::ckAccessToken(oauth2)


    CkJsonObject::ckDispose(jsonToken)
    CkOAuth2::ckDispose(oauth2)
    CkStringBuilder::ckDispose(sbJson)


    ProcedureReturn
EndProcedure