46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
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const isDocker = (() => {
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let isDocker;
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const hostname = require('os').hostname();
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const pattern = new RegExp(
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'[0-9]+\:[a-z_-]+\:\/docker\/' + hostname + '[0-9a-z]+', 'i'
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);
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try {
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isDocker = require('child_process')
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.execSync(
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'cat /proc/self/cgroup',
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{stdio: ['ignore', 'pipe', 'ignore']}
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)
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.toString().match(pattern) !== null;
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} catch (e) {
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isDocker = false;
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}
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return isDocker;
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})();
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const defaultHost = isDocker ? '0.0.0.0' : 'localhost';
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// when we're runing in Docker, we can expect (generally, in a development
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// scenario) that the user would like to connect to the service in the
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// container via the **host's** loopback address, so this helper can be used to
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// swap 0.0.0.0 for localhost in code/messages that pertain to client-side
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function canonicalHost(host) {
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return isDocker && host === '0.0.0.0' ? 'localhost' : host;
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}
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function dockerHostSwap(host) {
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return (isDocker && (host === 'localhost' || host === '127.0.0.1')) ? defaultHost : host;
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}
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const defaultCorsHost = canonicalHost(defaultHost);
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module.exports = {
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canonicalHost,
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defaultCorsHost,
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defaultHost,
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dockerHostSwap,
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isDocker
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};
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