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denkfabrik-li
933eaa2ba4
Adds "Microsoft 365 (OAuth)" to the Email settings provider dropdown. Selecting it swaps the SMTP form for an app registration (client id, secret, optional tenant) and a "Connect mailbox" flow: the admin signs into the mailbox the installation should send as, and outgoing email goes through Graph sendMail as that mailbox — no password, no app password, no SMTP AUTH, which Microsoft is winding down. Delegated flow on purpose: it needs no admin consent and works for work/school and personal accounts alike. Its one weakness — a grant can die silently behind a password reset or a Conditional Access change — is answered by a daily scheduled refresh that keeps the token alive and, on a dead grant, warns the settings admins once in-app and on the settings page instead of letting mail stop quietly. Tokens and the client secret live encrypted in their own row and are read fresh at send time, never through the boot-config cache. The stored SMTP transport survives a provider switch untouched.
86 lines
3.4 KiB
PHP
86 lines
3.4 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Modules\Platform\Mail;
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use App\Modules\Platform\Settings\MailProvider;
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use Illuminate\Support\Facades\Http;
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use Symfony\Component\Mailer\Exception\TransportException;
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use Symfony\Component\Mailer\SentMessage;
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use Symfony\Component\Mailer\Transport\AbstractTransport;
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/**
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* Sends through Microsoft Graph's sendMail as the connected mailbox.
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*
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* Graph rather than smtp.office365.com because SMTP submission (both
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* password and XOAUTH2) is the endpoint Microsoft is winding down, while
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* Graph is where they invest — this transport is the future-proof half
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* of the Microsoft 365 provider, the connect flow in MicrosoftMailBroker
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* is the other.
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*
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* The message goes up as base64 MIME, not as Graph's JSON message shape:
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* Symfony already rendered the exact bytes (themed HTML, alternatives,
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* attachments), and re-describing them in JSON is a second
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* serializer to get subtly wrong. Exchange reads recipients from the
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* MIME headers and strips Bcc on delivery, so all three recipient kinds
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* behave. The connection row is read fresh on every send — a queue
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* worker holds this transport for its whole life, and tokens rotate
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* underneath it.
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*
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* Sending as the connected mailbox is a property of delegated Graph, not
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* a limitation of this class: the From header must be that mailbox (or
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* one it holds SendAs rights over), which is why MailConfigApplier pins
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* mail.from.address to the connected account while this provider is
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* active.
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*/
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class MicrosoftGraphTransport extends AbstractTransport
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{
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public function __construct(private readonly MicrosoftMailBroker $broker)
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{
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parent::__construct();
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}
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protected function doSend(SentMessage $message): void
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{
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$connection = MailOAuthConnection::for(MailProvider::Microsoft365);
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if (! $connection->usable()) {
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throw new TransportException('Microsoft 365 is selected as the mail provider, but no mailbox is connected.');
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}
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try {
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$token = $this->broker->freshAccessToken($connection);
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} catch (MailOAuthException $e) {
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throw new TransportException('Could not get a Microsoft 365 access token: '.$e->getMessage(), 0, $e);
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}
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$response = Http::withToken($token)
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->withBody(base64_encode($message->toString()), 'text/plain')
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->post('https://graph.microsoft.com/v1.0/me/sendMail');
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// Graph acknowledges an accepted submission with 202 and an empty
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// body; anything else is a refusal worth the admin's attention
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// (SendAsDenied when the From header isn't the connected mailbox,
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// ErrorMessageSubmissionBlocked, throttling).
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if ($response->status() !== 202) {
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$code = $response->json('error.code');
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$detail = $response->json('error.message');
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// The code carries the diagnosis ("ErrorQuotaExceeded",
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// "ErrorSendAsDenied"); Graph's message text is often generic
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// to the point of useless, so both go into the exception.
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throw new TransportException(
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'Microsoft Graph refused the message (HTTP '.$response->status()
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.(is_string($code) && $code !== '' ? ', '.$code : '').')'
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.(is_string($detail) && $detail !== '' ? ': '.$detail : '.'),
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);
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}
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}
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public function __toString(): string
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{
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return 'microsoft-graph';
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}
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}
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