(Visual FoxPro) 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.

For more information, see https://www.dropbox.com/developers/documentation/http/documentation

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

LOCAL loHttp
LOCAL lnSuccess
LOCAL loJson
LOCAL loReq
LOCAL loResp
LOCAL loSbResponseBody
LOCAL loJResp
LOCAL lnRespStatusCode
LOCAL lcAccess_token

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = 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

loHttp.Login = "DROPBOX_APP_KEY"
loHttp.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
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loJson.LoadFile("qa_data/tokens/dropbox.json")
IF (lnSuccess = 0) THEN
    ? loJson.LastErrorText
    RELEASE loHttp
    RELEASE loJson
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')
loReq.AddParam("grant_type","refresh_token")
loReq.AddParam("refresh_token",loJson.StringOf("refresh_token"))

loResp = loHttp.PostUrlEncoded("https://api.dropbox.com/oauth2/token",loReq)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbResponseBody = CreateObject('Chilkat.StringBuilder')
loResp.GetBodySb(loSbResponseBody)

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJResp = CreateObject('Chilkat.JsonObject')
loJResp.LoadSb(loSbResponseBody)
loJResp.EmitCompact = 0

? "Response Body:"
? loJResp.Emit()

lnRespStatusCode = loResp.StatusCode
? "Response Status Code = " + STR(lnRespStatusCode)
IF (lnRespStatusCode >= 400) THEN
    ? "Response Header:"
    ? loResp.Header
    ? "Failed."
    RELEASE loResp
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    RELEASE loSbResponseBody
    RELEASE loJResp
    CANCEL
ENDIF

RELEASE loResp

* 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
* }

lcAccess_token = loJResp.StringOf("access_token")
? "New Access Token: " + lcAccess_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.)
loJson.UpdateString("access_token",lcAccess_token)

loJson.WriteFile("qa_data/tokens/dropbox.json")

RELEASE loHttp
RELEASE loJson
RELEASE loReq
RELEASE loSbResponseBody
RELEASE loJResp