(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$http = New-Object 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

$http.Login = "DROPBOX_APP_KEY"
$http.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
$json = New-Object Chilkat.JsonObject
$success = $json.LoadFile("qa_data/tokens/dropbox.json")
if ($success -eq $false) {
    $($json.LastErrorText)
    exit
}

$req = New-Object Chilkat.HttpRequest
$req.AddParam("grant_type","refresh_token")
$req.AddParam("refresh_token",$json.StringOf("refresh_token"))

$resp = $http.PostUrlEncoded("https://api.dropbox.com/oauth2/token",$req)
if ($http.LastMethodSuccess -eq $false) {
    $($http.LastErrorText)
    exit
}

$sbResponseBody = New-Object Chilkat.StringBuilder
$resp.GetBodySb($sbResponseBody)

$jResp = New-Object Chilkat.JsonObject
$jResp.LoadSb($sbResponseBody)
$jResp.EmitCompact = $false

$("Response Body:")
$($jResp.Emit())

$respStatusCode = $resp.StatusCode
$("Response Status Code = " + $respStatusCode)
if ($respStatusCode -ge 400) {
    $("Response Header:")
    $($resp.Header)
    $("Failed.")

    exit
}

# 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
# }

$access_token = $jResp.StringOf("access_token")
$("New Access Token: " + $access_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.)
$json.UpdateString("access_token",$access_token)

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