(Lianja) 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 Lianja Extension Download Chilkat Lianja Extension

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

loHttp = createobject("CkHttp")

// 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
loJson = createobject("CkJsonObject")
llSuccess = loJson.LoadFile("qa_data/tokens/dropbox.json")
if (llSuccess = .F.) then
    ? loJson.LastErrorText
    release loHttp
    release loJson
    return
endif

loReq = createobject("CkHttpRequest")
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 = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loJson
    release loReq
    return
endif

loSbResponseBody = createobject("CkStringBuilder")
loResp.GetBodySb(loSbResponseBody)

loJResp = createobject("CkJsonObject")
loJResp.LoadSb(loSbResponseBody)
loJResp.EmitCompact = .F.

? "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
    return
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