VB.NET Requires Chilkat v11.5.0+

Box: Get a Service Account Token with Client Credentials

See more Box Examples

Obtain a Box service-account token using the client credentials grant. Configure and authorize a Server app first. Load credentials from protected application configuration; do not ship a client secret in a public client.

See the Box API guide for setup and the complete workflow.

VB.NET

Dim success As Boolean = False

'  Requires Chilkat 11.5.0 or later and a previously unlocked Chilkat bundle.
'  See Global Unlock Sample.
'  Guide: Box API Guide.

success = False

Dim curl As New Chilkat.HttpCurl
curl.SetVar("client_id","BOX_CLIENT_ID")
curl.SetVar("client_secret","BOX_CLIENT_SECRET")
curl.SetVar("enterprise_id","BOX_ENTERPRISE_ID")
'  enterprise identifies the app's service account. This is not an admin-user token.
curl.ClearTargetOutput("*")
curl.ClearVar("access_token")
curl.AddTargetOutput("access_token","access_token")
success = curl.DoYourThing("curl -X POST ""https://api.box.com/oauth2/token"" --data-urlencode ""grant_type=client_credentials"" --data-urlencode ""client_id={{client_id}}"" --data-urlencode ""client_secret={{client_secret}}"" --data-urlencode ""box_subject_type=enterprise"" --data-urlencode ""box_subject_id={{enterprise_id}}""")
If ((success <> True) Or (curl.StatusCode <> 200)) Then
    Debug.WriteLine("Box request failed. HTTP status: " & curl.StatusCode)
    Debug.WriteLine("Failure reason: " & curl.FailReason)
    Exit Sub
End If

If (curl.VarDefined("!") <> True) Then
    Debug.WriteLine("Expected response fields are missing.")
    Exit Sub
End If

'  Keep this token in protected application memory; reacquire it when it expires.
'  Do not print tokens or the complete token response.
Debug.WriteLine("Service-account access token obtained.")
curl.ClearTargetOutput("*")
Dim authorizedCommand1 As New Chilkat.StringBuilder
authorizedCommand1.SetString("curl -X GET ""https://api.box.com/2.0/users/me?fields=id,name,login"" -H ""Authorization: Bearer {{access_token}}""")
Dim headerReplacement1 As Integer = authorizedCommand1.Replace("{{access_token}}",curl.GetVar("access_token"))
success = curl.DoYourThing(authorizedCommand1.GetAsString())
If ((success <> True) Or (curl.StatusCode <> 200)) Then
    Debug.WriteLine("Box request failed. HTTP status: " & curl.StatusCode)
    Debug.WriteLine("Failure reason: " & curl.FailReason)
    Debug.WriteLine(curl.ResponseBodyStr)
    Exit Sub
End If

Debug.WriteLine(curl.ResponseBodyStr)