dadaloop82
099a6cc4e8
The browser (HTTPS) cannot connect to ws:// directly (mixed-content block).
Solution: PHP SSE relay bridges the gap server-side.
- api/scale_relay.php: GET ?url=ws://ip:port
PHP opens WS connection to Android gateway, streams JSON frames as
Server-Sent Events to the browser over existing HTTPS connection.
Includes WS handshake, masked client frames, frame decoder, keep-alive.
- api/scale_ping.php: GET ?url=ws://ip:port
One-shot connectivity test, returns {"ok":true} or {"ok":false,"error"}.
- app.js: WebSocket -> EventSource (SSE)
_scaleWs -> _scaleEs, connects to /api/scale_relay.php
testScaleConnection() -> fetch /api/scale_ping.php (no more direct ws://)
readScaleWeight(): removed get_weight send (scale streams continuously)
68 lines
1.8 KiB
PHP
68 lines
1.8 KiB
PHP
<?php
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/**
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* EverShelf Scale Gateway — Connection ping / test
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*
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* Performs a WebSocket handshake with the gateway and returns
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* {"ok":true} on success, {"ok":false,"error":"..."} on failure.
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*
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* Usage: GET /api/scale_ping.php?url=ws%3A%2F%2F192.168.1.100%3A8765
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*/
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header('Content-Type: application/json');
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header('Cache-Control: no-cache');
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$rawUrl = $_GET['url'] ?? '';
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if (!preg_match('#^ws://[0-9a-zA-Z][\w.\-]*(:\d{1,5})?(/.*)?$#', $rawUrl)) {
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echo json_encode(['ok' => false, 'error' => 'Invalid gateway URL (must start with ws://)']);
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exit;
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}
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$parsed = parse_url($rawUrl);
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$host = $parsed['host'] ?? '';
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$port = (int)($parsed['port'] ?? 8765);
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$path = ($parsed['path'] ?? '') ?: '/';
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if (!$host || $port < 1 || $port > 65535) {
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echo json_encode(['ok' => false, 'error' => 'Invalid host or port']);
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exit;
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}
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// Try to open a TCP connection with a 5-second timeout
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$sock = @stream_socket_client("tcp://{$host}:{$port}", $errno, $errstr, 5);
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if (!$sock) {
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echo json_encode(['ok' => false, 'error' => "Cannot connect to {$host}:{$port} — {$errstr}"]);
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exit;
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}
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stream_set_timeout($sock, 5);
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// Perform WebSocket handshake
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$wsKey = base64_encode(random_bytes(16));
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fwrite($sock,
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"GET {$path} HTTP/1.1\r\n" .
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"Host: {$host}:{$port}\r\n" .
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"Upgrade: websocket\r\n" .
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"Connection: Upgrade\r\n" .
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"Sec-WebSocket-Key: {$wsKey}\r\n" .
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"Sec-WebSocket-Version: 13\r\n" .
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"\r\n"
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);
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// Read HTTP response (looking for 101 Switching Protocols)
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$resp = '';
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while (!feof($sock)) {
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$line = fgets($sock, 1024);
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if ($line === false) break;
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$resp .= $line;
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if ($line === "\r\n") break;
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}
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fclose($sock);
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if (str_contains($resp, '101')) {
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echo json_encode(['ok' => true]);
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} else {
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echo json_encode(['ok' => false, 'error' => 'WebSocket handshake failed — check that the gateway app is running']);
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}
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