Google Account wechseln und YT-Kanal abonnieren

insert 	POST /subscriptions 	Adds a subscription for the authenticated user's channel.

<#
    ######################################
    ###### Google-Youtube-API         #######
    ######################################
    -> benötigt wird mind. PS Version 3.0
#>

if ($PSVersionTable.PSVersion.Major -lt 3){write-host "ERROR: Minimum Powershell Version 3.0 is required!" -F Yellow; return}  

# ANPASSUNGEN HIER VORNEHMEN ===========================================================

# Client API Zugangsdaten hier eintragen
$client_id = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'  
$client_secret = 'XXXXXXXXXXXXXXXXXXXXXXXXXXX'  
# Array der Bereiche die autorisiert werden sollen (In diesem Beispiel erhält die Anwendung Vollzugriff auf alle Google-Drive Funktionen)
$global:scopes = @('https://www.googleapis.com/auth/youtube')  
# Pfad in dem das Refresh-Token gespeichert wird mit dem man ein neues Access Token anfordert (Standardmäßig der Ordner in dem das Skript liegt)
$global:token_path = "$(Split-Path $PSCommandPath -Parent)\refresh.token"  
# E-Mail-Adresse des Google-Kontos
$global:gmail_email = 'XXXXXX@gmail.com'  

# ENDE EINRICHTUNG =====================================================================

Add-Type -AssemblyName System.Windows.Forms
<# 
    -------------------------------------------------------------------------------------------
    Funktion: Haupt-Authentifizierungsfunktion (OAuth 2.0) für Zugriffe auf die Google-Dienste
    -------------------------------------------------------------------------------------------
#>
function Auth-Google(){
    # wenn kein Refresh-Token vorhanden ist, initiale Authorization starten ...
    if ((Test-Path $global:token_path)){
        $content = gc $global:token_path -TotalCount 1
        if ($content.length -gt 0){$global:refresh_token = $content}
    }
    if(!$global:refresh_token){
        $url = "https://accounts.google.com/o/oauth2/auth?scope=$($global:scopes -join " ")&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code&client_id=$client_id"  
        # Manuelle Authorization mit Userinteraktion
        write-host "Starting Authorization Request in Browser ... (Please Login into your Google-Account, and accept the authorization request, copy the returned code and close the Browser-Window !" -ForegroundColor Green  
        Start-Process "iexplore.exe" -ArgumentList $url -Wait  
        $authcode = [System.Windows.Forms.Clipboard]::GetText()
        
        # Get Auth-Code via IE Automation, fully automated.
        #$authcode = Get-AuthCode $url

        $requestbody = @{
        "code"=$authcode  
        "client_id"=$client_id  
        "client_secret"=$client_secret  
        "redirect_uri"='urn:ietf:wg:oauth:2.0:oob'  
        "grant_type"="authorization_code"  
        }
    
        $result = Invoke-RestMethod 'https://www.googleapis.com/oauth2/v3/token' -Method Post -Body $requestbody  
        $global:refresh_token = $result.refresh_token
        set-content $global:token_path -Value $global:refresh_token
        $global:access_token = $result.access_token
        $global:token_expires = $result.expires_in
        $global:token_created = get-date
        return $true
    }else{
        # kein access_token vorhanden => neues access_token via refresh holen
        if (!$global:access_token){
            write-host "Refreshing access_token ..."  
            $requestbody = @{
            "refresh_token"=$global:refresh_token  
            "client_id"=$client_id  
            "client_secret"=$client_secret  
            "grant_type"="refresh_token"  
            }
            Try{
                $tokenrequest = Invoke-RestMethod 'https://www.googleapis.com/oauth2/v3/token' -Method Post -Body $requestbody -EA Stop  
                $global:access_token = $tokenrequest.access_token
                $global:token_created = get-date
                $global:token_expires = $tokenrequest.expires_in
                return $true
            }catch{
                write-host $_.Exception.Message
                return $false
            }
        }else{
            # access_token vorhanden, überprüfe ob es abgelaufen ist
            if((((get-date) - $global:token_created).TotalSeconds) -ge $global:token_expires){
                # access_token ist abgelaufen => fordere ein neues an
                write-host "Access Token has expired ..."  
                $global:access_token = ""  
                Auth-Google
            }else{
                # gültiges access_token vorhanden
                return $true
            }
        }
    }
}

<#
   #####  Funktion zum abonnieren eines Channels #####
#>

function Subscribe-Channel(){
param(
    [parameter(mandatory=$true)][string]$channelid
)
        # Autorisierung
        if(!(Auth-Google)){
            return $false 
        }

        try{
            $uri = "https://www.googleapis.com/youtube/v3/subscriptions?part=snippet&access_token=$($global:access_token)"  
            $props = @{
                'snippet' = @{  
                    'resourceId' = @{  
                        'kind' = 'youtube#subscription'  
                        'channelId' = $channelid  
                    }
                }
            } | ConvertTo-Json
            $result = Invoke-RestMethod -uri $uri -body $props -Method Post -ContentType "application/json"  
            return $result
        }catch{
            throw $_.Exception.InnerException
        }
}

# Channel testweise abonnieren (https://www.youtube.com/channel/UC_I32g5fMXlLtp9_DG9j9SA) "Ruthe Cartoons" ;-) 
Subscribe-Channel -channelid 'UC_I32g5fMXlLtp9_DG9j9SA'