[kbn-es] Support for passing regex value to ES (#42651)

We test each value to determine if it's a file, in which case we move it to the
config directory. This is required to support things like SSL certificates which
are required to be within the ES directory. path.isAbsolute evalues to true for
a regular expression. In order to resolve this, we also verify that the file
exists.

Signed-off-by: Tyler Smalley <[email protected]>

packages/kbn-es/src/utils/extract_config_files.js

@@ -55,7 +55,7 @@ exports.extractConfigFiles = function extractConfigFiles(config, dest, options =
 };
 
 function isFile(dest = '') {
-  return path.isAbsolute(dest) && path.extname(dest).length > 0;
+  return path.isAbsolute(dest) && path.extname(dest).length > 0 && fs.existsSync(dest);
 }
 
 function copyFileSync(src, dest) {

packages/kbn-es/src/utils/extract_config_files.test.js

@@ -47,13 +47,29 @@ test('copies file', () => {
   expect(fs.writeFileSync.mock.calls[0][0]).toEqual('/es/config/foo.yml');
 });
 
+test('ignores file which does not exist', () => {
+  fs.existsSync = () => false;
+  extractConfigFiles(['path=/data/foo.yml'], '/es');
+
+  expect(fs.readFileSync).not.toHaveBeenCalled();
+  expect(fs.writeFileSync).not.toHaveBeenCalled();
+});
+
 test('ignores non-paths', () => {
   const config = extractConfigFiles(['foo=bar', 'foo.bar=baz'], '/es');
 
   expect(config).toEqual(['foo=bar', 'foo.bar=baz']);
 });
 
+test('keeps regular expressions intact', () => {
+  fs.existsSync = () => false;
+  const config = extractConfigFiles(['foo=bar', 'foo.bar=/https?://127.0.0.1(:[0-9]+)?/'], '/es');
+
+  expect(config).toEqual(['foo=bar', 'foo.bar=/https?://127.0.0.1(:[0-9]+)?/']);
+});
+
 test('ignores directories', () => {
+  fs.existsSync = () => true;
   const config = extractConfigFiles(['path=/data/foo.yml', 'foo.bar=/data/bar'], '/es');
 
   expect(config).toEqual(['path=foo.yml', 'foo.bar=/data/bar']);