Metadata inconsistency for links and user mentions

[crokkon]

Expected behavior

steeditor should put URLs and user mentions from the post body in the corresponding json_metadata fields

Actual behavior

• non-markdown links are not included in json_metadata['links']. This is a problem for the utopian templates, since they propose the target repository as non-markdown links, but the utopian-spreadsheet repo parses json_metadata['links'] for that string:
  https://github.com/amosbastian/utopian-spreadsheet/blob/b4953e9af7910ffc3336a1945c3b31ae16aafb72/spreadsheet.py#L50
  The target repository is not necessarily detected correctly in this case.

• user-mentions are found within markdown URLs. This is not necessarily a bug, only inconsistent to other interfaces.

How to reproduce

Two test posts with the same body: utopian template + one image + a markdown link

• from steeditor: steemd

{"app":"steeditor/0.1.0",
"format":"markdown",
"image":["https://steemitimages.com/0x0/https://user-images.githubusercontent.com/33018033/42889616-25f17de6-8aab-11e8-971e-e05abdb331e1.png"],
"tags":["not-utopian","not-analysis"],
"users":["stmdev"],
"links":["https://steemit.com/test/@stmdev/steeditor-test-1532283370486"],
"community":"steeditor"}

• from steemit steemd

{"tags":["not-utopian","not-analysis"],
"image":["https://steemitimages.com/0x0/https://user-images.githubusercontent.com/33018033/42889616-25f17de6-8aab-11e8-971e-e05abdb331e1.png"],
"links":["https://github.com/utopian-io/utopian.io","https://steemit.com/test/@stmdev/steeditor-test-1532283370486"],
"app":"steemit/0.1",
"format":"markdown"}

Differences:

• The steeditor metadata doesn't contain the repository in the links section, so the target repository may be empty or possibly wrong in the utopian review sheet. The steemit metadata contains the repository as the first entry in links
• The steeditor metadata detects a user mention in the markdown link for @stmdev, while steemit treats this as part of the URL and doesn't add a users field.

Environement

steeditor.app as live on 2018-08-29
Chrome 68.0