#These will need to be updated for prod
$api_server_url = "https://platform.devtest.ringcentral.com"
$media_server_url = "https://media.devtest.ringcentral.com:443"
$username = '<user_name>'
$password = '<password>'
$extension = '<test extension>'

#Base64 encoded strings as : Appkey:Appsecurity_key   use this site: https://www.base64encode.org/ or build your own. it never changes so meh
$app_key = "<APP KEY>"


#
# No config changes needed beyond this point needed
#

#Global default header.
#Used for auth_initiate and auth_refresh
$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Authorization", "Basic $app_key")
$headers.Add("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8")

#Global authorization hashtable. This will be handed through functions/etc to maintain authorization
    $auth_obj = [PSCustomObject] @{
    Isset = $false
    }


#Called from get-authstatus this creates the initial authorization tokens and populates the global $auth_obj with that data
#It also returns the object for parsing, or False for a failure and logs the error.
function auth_initiate() {

    #Authentication post data
    $auth_post = @{
    grant_type = 'password'
    username = $username
    password = $password
    extension = $extension
    }

    try {
    $url = $api_server_url + "/restapi/oauth/token"
    $auth_token = invoke-restmethod -Method Post -Uri $url -Body $auth_post -headers $headers -ContentType "application/x-www-form-urlencoded"
    $authorization = $auth_token.token_type + " " +$auth_token.Access_token
    } catch {
    echo "Error refresh token: $_" >> $log_path
    return $False
    }

    $Global:auth_obj = [PSCustomObject] @{
    Isset = $true
    authorization = $authorization
    refresh_token = $auth_token.refresh_token
    expires_in = (Get-date).Addseconds($auth_token.expires_in)
    refresh_token_expires_in = (Get-date).Addseconds($auth_token.refresh_token_expires_in)
    scope = $auth_token.scope
    owner_id = $auth_token.owner_id
    endpoint_id = $auth_token.endpoint_id
    }
return $auth_obj
}

#Called from get-authstatus this refreshes authorization tokens and populates the global $auth_obj with that data
#It also returns the object for parsing, or False for a failure and logs the error.
function auth_refresh() {
    $refresh_post  = @{
    grant_type = 'refresh_token'
    refresh_token = $refresh_token
    }

    $url = $api_server_url + "/restapi/oauth/token"

    try {
    $auth_token = invoke-restmethod -Method Post -Uri $url -Body $refresh_post -headers $headers -ContentType "application/x-www-form-urlencoded"
    $authorization = $auth_token.token_type + " " +$auth_token.Access_token
    } catch {
    echo "Error refresh token: $_" >> $log_path
    return $false
    }

    $Global:auth_obj = [PSCustomObject] @{
    Isset = $true
    authorization = $authorization
    refresh_token = $auth_token.refresh_token
    expires_in = (Get-date).Addseconds($auth_token.expires_in)
    refresh_token_expires_in = (Get-date).Addseconds($auth_token.refresh_token_expires_in)
    scope = $auth_token.scope
    owner_id = $auth_token.owner_id
    endpoint_id = $auth_token.endpoint_id
    }

return $auth_obj
}


function get-authstatus() {
    if(($auth_obj.expires_in -gt (get-date)) -and ($auth_obj.isset -eq $true)) {
    return $true
    }elseif(($auth_obj.expires_in -gt (get-date)) -and ($auth_obj.isset -eq $true)) {
        if(auth_refresh) {
        echo "Token expired and refreshed successfully" >> $log_path
        return $true
        } else {
        echo "Failed Token refresh" >> $log_path
        return $false
        }
    } else {
        if(auth_initiate) {
        echo "Initializing Auth token">> $log_path
        return $true
        }
    }
}


#
# Example of making a call to the api
#
Function get-calllog() {
if(get-authstatus) {
    $auth_token = $auth_obj.authorization
    } else {
    return $false
    }
try {
$call = invoke-restmethod -uri "$api_server_url/restapi/v1.0/account/~/call-log"  -Headers @{"Authorization" = "$auth_token"}
} catch {
return $false
}
return $call
}