Xbase++

Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token. Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL oJson
LOCAL oReq
LOCAL oResp
LOCAL oSbResponseBody
LOCAL oJResp
LOCAL nRespStatusCode
LOCAL cAccess_token

nSuccess := 0

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

oHttp := CreateObject("Chilkat.Http")

//  Implements the following CURL command:

//  curl -X GET https://api.dropbox.com/oauth2/token \
//      -d grant_type=refresh_token \
//      -d refresh_token=<YOUR_REFRESH_TOKEN> \
//      -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

//  Use the following online tool to generate HTTP code from a CURL command
//  Convert a cURL Command to HTTP Source Code

oHttp:Login := "DROPBOX_APP_KEY"
oHttp:Password := "DROPBOX_APP_SECRET"

//  Get the refresh token from the JSON we saved when originally getting the access token.
//  (See Get Dropbox OAuth2 Access Token w/ Refresh Token
oJson := CreateObject("Chilkat.JsonObject")
nSuccess := oJson:LoadFile("qa_data/tokens/dropbox.json")
IF (nSuccess == 0)
    ? oJson:LastErrorText
    oHttp:destroy()
    oJson:destroy()
    RETURN
ENDIF

oReq := CreateObject("Chilkat.HttpRequest")
oReq:AddParam("grant_type", "refresh_token")
oReq:AddParam("refresh_token", oJson:StringOf("refresh_token"))

oReq:HttpVerb := "POST"
oReq:ContentType := "application/x-www-form-urlencoded"

oResp := CreateObject("Chilkat.HttpResponse")
nSuccess := oHttp:HttpReq("https://api.dropbox.com/oauth2/token", oReq, oResp)
IF (nSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    oJson:destroy()
    oReq:destroy()
    oResp:destroy()
    RETURN
ENDIF

oSbResponseBody := CreateObject("Chilkat.StringBuilder")
oResp:GetBodySb(oSbResponseBody)

oJResp := CreateObject("Chilkat.JsonObject")
oJResp:LoadSb(oSbResponseBody)
oJResp:EmitCompact := 0

? "Response Body:"
? oJResp:Emit()

nRespStatusCode := oResp:StatusCode
? "Response Status Code = " + Str(nRespStatusCode)
IF (nRespStatusCode >= 400)
    ? "Response Header:"
    ? oResp:Header
    ? "Failed."
    oHttp:destroy()
    oJson:destroy()
    oReq:destroy()
    oResp:destroy()
    oSbResponseBody:destroy()
    oJResp:destroy()
    RETURN
ENDIF

//  Sample JSON response:
//  (Sample code for parsing the JSON response is shown below)

//  {
//    "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
//    "token_type": "bearer",
//    "expires_in": 14400
//  }

cAccess_token := oJResp:StringOf("access_token")
? "New Access Token: " + cAccess_token

//  Perhaps update our Dropbox JSON file with the new access token.
//  (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
oJson:UpdateString("access_token", cAccess_token)

oJson:WriteFile("qa_data/tokens/dropbox.json")

oHttp:destroy()
oJson:destroy()
oReq:destroy()
oResp:destroy()
oSbResponseBody:destroy()
oJResp:destroy()