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Avoid env var reference loops and support $parent. prefix

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Fixes #2099
This commit is contained in:
Nick O'Leary
2019-03-20 13:37:33 +00:00
parent 962a29110c
commit ee6c6266cc
2 changed files with 44 additions and 10 deletions
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40
packages/node_modules/@node-red/runtime/lib/nodes/flows/Subflow.js vendored
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@@ -263,17 +263,37 @@ class Subflow extends Flow {
* @return {Object} val value of env var
*/
getSetting(name) {
var env = this.env;
if (env && env.hasOwnProperty(name)) {
var val = env[name];
try {
var ret = redUtil.evaluateNodeProperty(val.value, val.type, this.node, null, null);
return ret;
}
catch (e) {
this.error(e);
return undefined;
this.trace("getSetting:"+name);
if (!/^\$parent\./.test(name)) {
var env = this.env;
if (env && env.hasOwnProperty(name)) {
var val = env[name];
// If this is an env type property we need to be careful not
// to get into lookup loops.
// 1. if the value to lookup is the same as this one, go straight to parent
// 2. otherwise, check if it is a compound env var ("foo $(bar)")
// and if so, substitute any instances of `name` with $parent.name
// See https://github.com/node-red/node-red/issues/2099
if (val.type !== 'env' || val.value !== name) {
let value = val.value;
if (val.type === 'env') {
value = value.replace(new RegExp("\\${"+name+"}","g"),"${$parent."+name+"}");
}
try {
var ret = redUtil.evaluateNodeProperty(value, val.type, this.node, null, null);
return ret;
}
catch (e) {
this.error(e);
return undefined;
}
} else {
// This _is_ an env property pointing at itself - go to parent
}
}
} else {
// name starts $parent. ... so delegate to parent automatically
name = name.substring(8);
}
var parent = this.parent;
if (parent) {