Check 'auth' field when displaying .dockercfg config

[jhadvig]

While working on https://bugzilla.redhat.com/show_bug.cgi?id=1506998 I've noticed that we are not checking for auth field in the old .dockercfg format, which looks like:

{
        "registryaddress": {
                "auth": "auth string",
                "email": "email@domain.com"
        }
}

The registryaddress could also contain username and password fields.

@spadgett PTAL

Will add the dist after review

[spadgett]

If this is specific to dockercfg, we should have that somewhere in the function name.

[jhadvig]

This method is not intended to be specific for dockercfg or config.json. It's purpose is to assemble an object that will contain server address, username, password.

[spadgett]

I would let the caller set the value in the auths object and just let this function return the data. Then the function takes fewer arguments and doesn't need to know anything about the structure of the decodedSecretData object passed to it.

(untested)

var getDockercfgServerParams = function(serverData) {
  var params = _.pick(serverData, ['email', 'username', 'password']);
  if (serverData.auth) {
    try {
      // Decode Base64-encoded username:password string.
      _.spread(window.atob(data.auth).split(":"), function(username, password) {
        params.username = username;
        params.password = password;
      });
    } catch(e) {}
  }

  return params;
};

then below in the decodeDockercfg function

decodedSecretData.auths[serverName] = getDockercfgServerParams(data);

https://lodash.com/docs/4.17.4#pick
https://lodash.com/docs/4.17.4#spread

[spadgett]

We should catch exceptions to avoid a runtime error if it's not properly encoded.

https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/atob

[jhadvig]

@spadgett I've updated the PR based on your comments.
I know that you suggested to rename the method for getting the server params to getDockercfgServerParams but that method should be Docker config format agnostic (should cover both .dockercfg and docker/config.json) so I've named it getServerParams.
Also I've refactored both decodeDockercfg and decodeDockerconfigjson method into single decodeDockerConfig method since both of them have been doing almost the same operations, there have been just slight differences which should be covered with a simple if.
Also added decoding error handling, here is the example with error notification:

Tested the change with single and multi server .dockercfg and docker/config.json and works as expected.

PTAL

[spadgett]

/kind bug

@jhadvig You have a dist mismatch

[spadgett]

/lgtm

[spadgett]

Hm.

pm ERR! phantomjs-prebuilt@2.1.15 install: `node install.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the phantomjs-prebuilt@2.1.15 install script 'node install.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the phantomjs-prebuilt package,
npm ERR! not with npm itself.

/retest

[openshift-merge-robot]

Automatic merge from submit-queue.