Twitter Integration: Build a Simple Plugin to render twitter URLs posted in channels

[aaronrothschild]

(NOTE: I have broken this ticket down into multiple tickets in this repo)

Create a Twitter Plugin that renders previews of Twitter URL links posted into Mattermost (***)

Problem:

• Twitter no longer provides Opengraph data on it’s pages, so rendering a preview of a tweet when someone posts a twitter URL into a channel - is no longer possible.
• Twitter requires vendors to use their APi to get the tweet data, then render it in the Channel.

Create a twitter plugin that will:

• Authenticate with a Twitter account using Oauth. (Not just a twitter API key, the user should be able to login)
• Render a URL preview whenever a tweet URL is posted in any channel
• Provide a tooltip hover that shows a simple rendering of a tweet when the mouse is hovered over any tweet URL in Mattermost
• Allow a user to monitor the associated twitter account and post any new tweets FROM/TO that account into a channel of the user’s choice.
• Allow the user to specify which tweets will get posted to the channel from a checkbox of options.
  • Options: (Only post messages sent TO the account, Only Messages sent FROM the account, or Both sent/received messages)
    - Option to Include @mentions of the account (checkbox)
    - Include in the incoming message the name of the twitter account it is posting.
• Ideally render the post so that it works on both desktop and mobile clients

You can use an older plugin by @bwesterb for inspiration https://github.com/bwesterb/twittermost and we have the starter plugin template located here: https://github.com/mattermost/mattermost-plugin-starter-template. Create a new Repo from this starter template and we'll work on the project there.

Jira Ticket: https://mattermost.atlassian.net/browse/MM-25940

cc @hanzei