(Ruby) Refresh Schwab OAuth2 Access Token

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Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

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

# See Get Schwab OAuth2 Access Token 
# for sample code showing how to obtain a Schwab access token for desktop apps.

# This example assumes we previously obtained an OAuth2 access token for Schwab.

jsonToken = Chilkat::CkJsonObject.new()
success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json")
if (success != true)
    print "Failed to load schwab-access-token.json" + "\n";
    exit
end

# The access token JSON looks something like this:

# {
#   "expires_in": 3600,
#   "x_refresh_token_expires_in": 8726400,
#   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
#   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
#   "token_type": "bearer"
# }

oauth2 = Chilkat::CkOAuth2.new()

oauth2.put_TokenEndpoint("https://api.schwabapi.com/v1/oauth/token")

# Replace these with actual values.
oauth2.put_ClientId("APP_KEY")
oauth2.put_ClientSecret("APP_SECRET")
oauth2.put_UseBasicAuth(true)

# Get the "refresh_token"
oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"))

# Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
if (success == false)
    print oauth2.lastErrorText() + "\n";
    exit
end

# The response contains a new access token, but we must keep
# our existing refresh token for when we need to refresh again in the future.
jsonToken.UpdateString("access_token",oauth2.accessToken())

# 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.
sbJson = Chilkat::CkStringBuilder.new()
jsonToken.put_EmitCompact(false)

jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",false)

print "OAuth2 token refreshed!" + "\n";
print "New Access Token = " + oauth2.accessToken() + "\n";