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<?php |
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declare(strict_types=1); |
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namespace PhpLightning\Invoice\Domain\LnAddress; |
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use PhpLightning\Http\HttpFacadeInterface; |
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use PhpLightning\Invoice\Domain\BackendInvoice\BackendInvoiceInterface; |
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final class InvoiceGenerator |
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{ |
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public const MESSAGE_PAYMENT_RECEIVED = 'Payment received!'; |
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/** @var int 100 Minimum in msat (sat/1000) */ |
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public const MIN_SENDABLE = 100_000; |
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/** @var int 10 000 000 Max in msat (sat/1000) */ |
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public const MAX_SENDABLE = 10_000_000_000; |
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public function __construct( |
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private BackendInvoiceInterface $backendInvoice, |
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private HttpFacadeInterface $httpFacade, |
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private string $lnAddress, |
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) { |
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} |
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/** |
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* @param string $imageFile The picture you want to display, if you don't want to show a picture, leave an empty string. |
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* Beware that a heavy picture will make the wallet fails to execute lightning address process! 136536 bytes maximum for base64 encoded picture data |
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*/ |
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public function generateInvoice( |
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int $amount, |
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string $imageFile = '', |
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): array { |
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// Modify the description if you want to custom it |
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// This will be the description on the wallet that pays your ln address |
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// TODO: Make this customizable from some external configuration file |
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$description = 'Pay to ' . $this->lnAddress; |
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$imageMetadata = $this->generateImageMetadata($imageFile); |
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$metadata = '[["text/plain","' . $description . '"],["text/identifier","' . $this->lnAddress . '"]' . $imageMetadata . ']'; |
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if (!$this->isValidAmount($amount)) { |
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return [ |
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'status' => 'ERROR', |
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'reason' => 'Amount is not between minimum and maximum sendable amount', |
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]; |
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} |
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$invoice = $this->backendInvoice->requestInvoice($amount / 1000, $metadata); |
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if ($invoice['status'] === 'OK') { |
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return $this->okResponse($invoice); |
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} |
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return $this->errorResponse($invoice); |
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} |
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private function generateImageMetadata(string $imageFile): string |
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{ |
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if ($imageFile === '') { |
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return ''; |
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} |
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$response = $this->httpFacade->get($imageFile); |
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if ($response === null) { |
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return ''; |
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} |
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return ',["image/jpeg;base64","' . base64_encode($response) . '"]'; |
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} |
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private function isValidAmount(int $amount): bool |
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{ |
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return $amount >= self::MIN_SENDABLE |
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&& $amount <= self::MAX_SENDABLE; |
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} |
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private function okResponse(array $invoice): array |
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{ |
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return [ |
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'pr' => $invoice['pr'], |
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'status' => 'OK', |
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'successAction' => [ |
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'tag' => 'message', |
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'message' => self::MESSAGE_PAYMENT_RECEIVED, |
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], |
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'routes' => [], |
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'disposable' => false, |
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]; |
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} |
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private function errorResponse(array $invoice): array |
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{ |
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return [ |
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'status' => $invoice['status'], |
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'reason' => $invoice['reason'], |
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]; |
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} |
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} |
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php-lightning /
lnaddress
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