62 lines
2.8 KiB
JavaScript
62 lines
2.8 KiB
JavaScript
'use strict';
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const path = require('path');
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const BEGIN_MARKER = '# BEGIN LINKFIELD MANAGED PROXY';
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const END_MARKER = '# END LINKFIELD MANAGED PROXY';
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function normalizePort(value) {
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const port = Number(value);
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if (!Number.isSafeInteger(port) || port < 1 || port > 65535) throw new Error(`Invalid Apache bridge port: ${value}`);
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return port;
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}
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function renderApacheBridge(portValue) {
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const port = normalizePort(portValue);
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return `${BEGIN_MARKER}\n` +
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`<IfModule mod_rewrite.c>\n` +
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` RewriteEngine On\n` +
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`\n` +
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` # Prefer a native Apache proxy when the host permits it.\n` +
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` <IfModule mod_proxy.c>\n` +
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` <IfModule mod_proxy_wstunnel.c>\n` +
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` RewriteCond %{HTTP:Upgrade} =websocket [NC]\n` +
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` RewriteRule ^api/realtime/?$ ws://127.0.0.1:${port}/api/realtime [P,L]\n` +
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` </IfModule>\n` +
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` RewriteRule ^api/(.*)$ http://127.0.0.1:${port}/api/$1 [P,L]\n` +
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` </IfModule>\n` +
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`\n` +
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` # Shared hosts often disable mod_proxy. Route ordinary API requests\n` +
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` # through the bundled PHP bridge instead.\n` +
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` RewriteCond %{REQUEST_FILENAME} !-f\n` +
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` RewriteRule ^api/(.*)$ api-bridge.php?path=/api/$1 [QSA,L]\n` +
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`</IfModule>\n` +
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`<Files ".linkfield-port">\n` +
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` Require all denied\n` +
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`</Files>\n` +
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`${END_MARKER}\n`;
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}
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function replaceManagedBlock(existingValue, managedBlock) {
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const existing = String(existingValue || '').replace(/\r\n?/g, '\n');
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const pattern = new RegExp(`(?:^|\\n)${BEGIN_MARKER.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}[\\s\\S]*?${END_MARKER.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}(?:\\n|$)`, 'g');
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const preserved = existing.replace(pattern, '\n').replace(/^\n+|\n+$/g, '');
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return preserved ? `${preserved}\n\n${managedBlock}` : managedBlock;
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}
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async function installApacheBridge({fsp, root, port, enabled = true} = {}) {
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if (!enabled) return {enabled:false, written:false, file:null};
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if (!fsp || typeof fsp.readFile !== 'function' || typeof fsp.writeFile !== 'function') throw new Error('A promises-compatible filesystem is required');
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const file = path.join(root, '.htaccess');
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let existing = '';
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try { existing = await fsp.readFile(file, 'utf8'); }
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catch (error) { if (error?.code !== 'ENOENT') throw error; }
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const next = replaceManagedBlock(existing, renderApacheBridge(port));
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if (next === existing.replace(/\r\n?/g, '\n')) return {enabled:true, written:false, file};
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const temporary = `${file}.linkfield-${process.pid}-${Date.now()}.tmp`;
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await fsp.writeFile(temporary, next, {encoding:'utf8', mode:0o644});
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await fsp.rename(temporary, file);
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return {enabled:true, written:true, file};
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}
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module.exports = Object.freeze({BEGIN_MARKER, END_MARKER, renderApacheBridge, replaceManagedBlock, installApacheBridge});
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