open-consul/ui-v2/app/utils/get-environment.js

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export default function(config = {}, win = window, doc = document) {
const dev = function() {
return doc.cookie
.split(';')
.filter(item => item !== '')
.map(item => item.trim().split('='));
};
const user = function(str) {
const item = win.localStorage.getItem(str);
return item === null ? undefined : item;
};
const getCurrentResource = function(scripts) {
const current = scripts[scripts.length - 1];
try {
return win.performance.getEntriesByType('resource').find(item => {
// current is based on the assumption that whereever this script is it's
// likely to be the same as the xmlhttprequests
return item.initiatorType === 'script' && current.src === item.name;
});
} catch (e) {
return {};
}
};
const resource = getCurrentResource(doc.getElementsByTagName('script'));
// TODO: Look to see if we can pull in HTTP headers here
// so we can let things be controlled via HTTP proxies, for example
// turning off blocking queries if its a busy cluster etc
const operator = function(str, env) {
let protocol;
switch (str) {
case 'CONSUL_HTTP_PROTOCOL':
return resource.nextHopProtocol || 'http/1.1';
case 'CONSUL_HTTP_MAX_CONNECTIONS':
protocol = env('CONSUL_HTTP_PROTOCOL');
// http/2, http2+QUIC/39 and SPDY don't have connection limits
switch (true) {
case protocol.indexOf('h2') === 0:
case protocol.indexOf('hq') === 0:
case protocol.indexOf('spdy') === 0:
// TODO: Change this to return -1 so we try to consistently
// return a value from env vars
return;
default:
// generally 6 are available
// reserve 1 for traffic that we can't manage
return 5;
}
}
};
const ui = function(key) {
let $;
switch (config.environment) {
case 'development':
case 'staging':
case 'coverage':
case 'test':
$ = dev().reduce(function(prev, [key, value]) {
switch (key) {
case 'CONSUL_ACLS_ENABLE':
prev['CONSUL_ACLS_ENABLED'] = !!JSON.parse(String(value).toLowerCase());
break;
case 'CONSUL_NSPACES_ENABLE':
prev['CONSUL_NSPACES_ENABLED'] = !!JSON.parse(String(value).toLowerCase());
break;
default:
prev[key] = value;
}
return prev;
}, {});
if (typeof $[key] !== 'undefined') {
return $[key];
}
break;
}
return config[key];
};
return function env(str) {
switch (str) {
// All user providable values should start with CONSUL_UI
// We allow the user to set these ones via localStorage
// user value is preferred.
case 'CONSUL_UI_DISABLE_REALTIME':
case 'CONSUL_UI_DISABLE_ANCHOR_SELECTION':
// these are booleans cast things out
return !!JSON.parse(String(user(str) || 0).toLowerCase()) || ui(str);
case 'CONSUL_UI_REALTIME_RUNNER':
// these are strings
return user(str) || ui(str);
case 'CONSUL_HTTP_PROTOCOL':
case 'CONSUL_HTTP_MAX_CONNECTIONS':
// We allow the operator to set these ones via various methods
// although UI developer config is preferred
return ui(str) || operator(str, env);
default:
return ui(str);
}
};
}