(Tcl) Vonage UC Extend Refresh Access Token

Refreshes the access token for Vonage UC Extend apps.

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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 Vonage UC Access Token 
# for sample code showing how to obtain a Vonage access token for desktop apps.

set jsonToken [new_CkJsonObject]

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

set oauth2 [new_CkOAuth2]

CkOAuth2_put_TokenEndpoint $oauth2 "https://api.vonage.com/token"

# Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "CLIENT_ID"
CkOAuth2_put_ClientSecret $oauth2 "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]

# If an "expires_on" member does not exist, then add the JSON member by
# getting the current system date/time and adding the "expires_in" seconds.
# This way we'll know when the token expires.
if {[CkJsonObject_HasMember $jsonToken "expires_on"] == 0} then {
    set dtExpire [new_CkDateTime]

    CkDateTime_SetFromCurrentSystemTime $dtExpire
    CkDateTime_AddSeconds $dtExpire [CkJsonObject_IntOf $jsonToken "expires_in"]
    CkJsonObject_AppendString $jsonToken "expires_on" [CkDateTime_getAsUnixTimeStr $dtExpire 0]
}

# 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/vonage_uc_extend.json" "utf-8" 0

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

delete_CkJsonObject $jsonToken
delete_CkOAuth2 $oauth2
delete_CkDateTime $dtExpire
delete_CkStringBuilder $sbJson