(Tcl) Okta: Refresh Access Token with the Auth Code Flow

Demonstrates how to refresh a token that was obtained using the authorization code flow.

For more information, see https://developer.okta.com/docs/guides/implement-auth-code-pkce/use-flow/

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load ./chilkat.dll

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

# See Get Okta Access Token using Authorization Code Flow with PKCE 
# for sample code showing how to obtain an Okta access token using the authorization code flow for native apps (with PKCE).

set jsonToken [new_CkJsonObject]

set success [CkJsonObject_LoadFile $jsonToken "qa_data/tokens/okta.json"]
if {$success != 1} then {
    puts "Failed to load myob.json"
    delete_CkJsonObject $jsonToken
    exit
}

set oauth2 [new_CkOAuth2]

CkOAuth2_put_TokenEndpoint $oauth2 "https://{yourOktaDomain}/oauth2/default/v1/token"

# Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "OKTA_CLIENT_ID"
CkOAuth2_put_ClientSecret $oauth2 "OKTA_CLIENT_SECRET"

# Get the "refresh_token"
CkOAuth2_put_RefreshToken $oauth2 [CkJsonObject_stringOf $jsonToken "refresh_token"]

# Send the HTTP POST to refresh the access token..
CkOAuth2_put_VerboseLogging $oauth2 1
set success [CkOAuth2_RefreshAccessToken $oauth2]
if {$success != 1} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkJsonObject $jsonToken
    delete_CkOAuth2 $oauth2
    exit
}

# Load the access token response into the json object 
CkJsonObject_Load $jsonToken [CkOAuth2_accessTokenResponse $oauth2]

# Save the new JSON access token response to a file.
# The access + refresh tokens contained in this JSON will be needed for the next refresh.
set sbJson [new_CkStringBuilder]

CkJsonObject_put_EmitCompact $jsonToken 0
CkJsonObject_EmitSb $jsonToken $sbJson
CkStringBuilder_WriteFile $sbJson "qa_data/tokens/okta.json" "utf-8" 0

puts "OAuth2 authorization granted!"
puts "New Access Token = [CkOAuth2_accessToken $oauth2]"

delete_CkJsonObject $jsonToken
delete_CkOAuth2 $oauth2
delete_CkStringBuilder $sbJson