B4X

Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example. B4X

Dim success As Boolean = False

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

'  It is assumed we previously obtained an OAuth2 access token.
'  This example loads the JSON access token file 
'  saved by this example: Get Docusign OAuth2 Access Token

Dim jsonToken As ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/docusign.json")
If success <> True Then
    Log("Failed to load docusign.json")
    Return
End If


'  The access token JSON looks like this:

'  {
'    "access_token": "eyJ0eXA....YQyig",
'    "token_type": "Bearer",
'    "refresh_token": "eyJ0eXA....auE3eHKg",
'    "expires_in": 28800
'  }

Dim oauth2 As ChilkatOAuth2
oauth2.Initialize("oauth2")

'  For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
'  For the production platform, the token endpoint is https://account.docusign.com/oauth/token
oauth2.TokenEndpoint = "https://account-d.docusign.com/oauth/token"

'  Replace these with actual values.
'  The client ID is also known as the "integration key" in Docusign.
oauth2.ClientId = "MY_DOCUSIGN_CLIENT_ID"
'  This is your secret key for the authorization code grant.
oauth2.ClientSecret = "MY_DOCUSIGN_CLIENT_SECRET"

'  Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

'  Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken
If success <> True Then
    Log(oauth2.LastErrorText)
    Return
End If


Log("New access token: " & oauth2.AccessToken)
Log("New refresh token: " & oauth2.RefreshToken)

'  Update the JSON with the new tokens.
jsonToken.UpdateString("access_token", oauth2.AccessToken)
jsonToken.UpdateString("refresh_token", oauth2.RefreshToken)

'  Save the new JSON access token response to a file.
Dim sbJson As ChilkatStringBuilder
sbJson.Initialize
jsonToken.EmitCompact = False
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/docusign.json", "utf-8", False)

Log("OAuth2 authorization granted!")
Log("New Access Token = " & oauth2.AccessToken)