Add initial Keybase Chat support (#877)

* initial work on native keybase bridging

* Hopefully make a functional keybase bridge

* add keybase to bridgemap

* send to right channel, try to figure out received msgs

* add account and userid

* i am a Dam Fool

* Fix formatting for messages, handle /me

* update vendors, ran golint and goimports

* move handlers to handlers.go, clean up unused config options

* add sample config, fix inconsistent remote nick handling

* Update readme with keybase links

* Resolve fixmie errors

* Error -> Errorf

* fix linting errors in go.mod and go.sum

* explicitly join channels, ignore messages from non-specified channels

* check that team names match before bridging message

1 files changed, 165 insertions, 137 deletions

diff --git a/README.md b/README.md
index 50c50cad..9386025a 100644
--- a/README.md
+++ b/README.md
@@ -3,32 +3,35 @@
 # matterbridge
 
 ![Matterbridge Logo](img/matterbridge-notext.gif)<br />
-   **A simple chat bridge**<br />
-   Letting people be where they want to be.<br />
-   <sub>Bridges between a growing number of protocols. Click below to demo or join the development chat.</sub>
+**A simple chat bridge**<br />
+Letting people be where they want to be.<br />
+<sub>Bridges between a growing number of protocols. Click below to demo or join the development chat.</sub>
 
    <sup>
 
-   [Gitter][mb-gitter] |
-   [IRC][mb-irc] |
-      [Discord][mb-discord] |
-      [Matrix][mb-matrix] |
-      [Slack][mb-slack] |
-      [Mattermost][mb-mattermost] |
-      [Rocket.Chat][mb-rocketchat] |
-      [XMPP][mb-xmpp] |
-      [Twitch][mb-twitch] |
-      [WhatsApp][mb-whatsapp] |
-      [Zulip][mb-zulip] |
-      [Telegram][mb-telegram] |
-      And more...
-   </sup>
-
-----
+[Gitter][mb-gitter] |
+[IRC][mb-irc] |
+[Discord][mb-discord] |
+[Matrix][mb-matrix] |
+[Slack][mb-slack] |
+[Mattermost][mb-mattermost] |
+[Rocket.Chat][mb-rocketchat] |
+[XMPP][mb-xmpp] |
+[Twitch][mb-twitch] |
+[WhatsApp][mb-whatsapp] |
+[Zulip][mb-zulip] |
+[Telegram][mb-telegram] |
+[Keybase][mb-keybase] |
+And more...
+</sup>
+
+---
+
 [![Download stable](https://img.shields.io/github/release/42wim/matterbridge.svg?label=download%20stable)](https://github.com/42wim/matterbridge/releases/latest)
-   [![Download dev](https://img.shields.io/bintray/v/42wim/nightly/Matterbridge.svg?label=download%20dev&colorB=007ec6)](https://bintray.com/42wim/nightly/Matterbridge/_latestVersion)
-   [![Maintainability](https://api.codeclimate.com/v1/badges/82dff70ef2ba85a6173a/maintainability)](https://codeclimate.com/github/42wim/matterbridge/maintainability)
-   [![Test Coverage](https://api.codeclimate.com/v1/badges/82dff70ef2ba85a6173a/test_coverage)](https://codeclimate.com/github/42wim/matterbridge/test_coverage)<br />
+[![Download dev](https://img.shields.io/bintray/v/42wim/nightly/Matterbridge.svg?label=download%20dev&colorB=007ec6)](https://bintray.com/42wim/nightly/Matterbridge/_latestVersion)
+[![Maintainability](https://api.codeclimate.com/v1/badges/82dff70ef2ba85a6173a/maintainability)](https://codeclimate.com/github/42wim/matterbridge/maintainability)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/82dff70ef2ba85a6173a/test_coverage)](https://codeclimate.com/github/42wim/matterbridge/test_coverage)<br />
+
   <hr />
 </div>
 <div align="right"><sup>
@@ -42,108 +45,118 @@
 </p>
 
 ### Table of Contents
- * [Features](https://github.com/42wim/matterbridge/wiki/Features)
-   * [Natively supported](#natively-supported)
-   * [3rd party via matterbridge api](#3rd-party-via-matterbridge-api)
-   * [API](#API)
- * [Chat with us](#chat-with-us)
- * [Screenshots](https://github.com/42wim/matterbridge/wiki/)
- * [Installing/upgrading](#installing--upgrading)
-   * [Binaries](#binaries)
- * [Building](#building)
- * [Configuration](#configuration)
-   * [Howto](https://github.com/42wim/matterbridge/wiki/How-to-create-your-config)
-   * [Settings](#settings)
-   * [Examples](#examples)
- * [Running](#running)
-   * [Docker](#docker)
- * [Changelog](#changelog)
- * [FAQ](#faq)
- * [Related projects](#related-projects)
- * [Articles](#articles)
- * [Thanks](#thanks)
+
+- [Features](https://github.com/42wim/matterbridge/wiki/Features)
+  - [Natively supported](#natively-supported)
+  - [3rd party via matterbridge api](#3rd-party-via-matterbridge-api)
+  - [API](#API)
+- [Chat with us](#chat-with-us)
+- [Screenshots](https://github.com/42wim/matterbridge/wiki/)
+- [Installing/upgrading](#installing--upgrading)
+  - [Binaries](#binaries)
+- [Building](#building)
+- [Configuration](#configuration)
+  - [Howto](https://github.com/42wim/matterbridge/wiki/How-to-create-your-config)
+  - [Settings](#settings)
+  - [Examples](#examples)
+- [Running](#running)
+  - [Docker](#docker)
+- [Changelog](#changelog)
+- [FAQ](#faq)
+- [Related projects](#related-projects)
+- [Articles](#articles)
+- [Thanks](#thanks)
 
 ## Features
-* [Support bridging between any protocols](https://github.com/42wim/matterbridge/wiki/Features#support-bridging-between-any-protocols)
-* [Support multiple gateways(bridges) for your protocols](https://github.com/42wim/matterbridge/wiki/Features#support-multiple-gatewaysbridges-for-your-protocols)
-* [Message edits and deletes](https://github.com/42wim/matterbridge/wiki/Features#message-edits-and-deletes)
-* Preserves threading when possible
-* [Attachment / files handling](https://github.com/42wim/matterbridge/wiki/Features#attachment--files-handling)
-* [Username and avatar spoofing](https://github.com/42wim/matterbridge/wiki/Features#username-and-avatar-spoofing)
-* [Private groups](https://github.com/42wim/matterbridge/wiki/Features#private-groups)
-* [API](https://github.com/42wim/matterbridge/wiki/Features#api)
+
+- [Support bridging between any protocols](https://github.com/42wim/matterbridge/wiki/Features#support-bridging-between-any-protocols)
+- [Support multiple gateways(bridges) for your protocols](https://github.com/42wim/matterbridge/wiki/Features#support-multiple-gatewaysbridges-for-your-protocols)
+- [Message edits and deletes](https://github.com/42wim/matterbridge/wiki/Features#message-edits-and-deletes)
+- Preserves threading when possible
+- [Attachment / files handling](https://github.com/42wim/matterbridge/wiki/Features#attachment--files-handling)
+- [Username and avatar spoofing](https://github.com/42wim/matterbridge/wiki/Features#username-and-avatar-spoofing)
+- [Private groups](https://github.com/42wim/matterbridge/wiki/Features#private-groups)
+- [API](https://github.com/42wim/matterbridge/wiki/Features#api)
 
 ### Natively supported
 
-* [Mattermost](https://github.com/mattermost/mattermost-server/) 4.x, 5.x
-* [IRC](http://www.mirc.com/servers.html)
-* [XMPP](https://xmpp.org)
-* [Gitter](https://gitter.im)
-* [Slack](https://slack.com)
-* [Discord](https://discordapp.com)
-* [Telegram](https://telegram.org)
-* [Rocket.chat](https://rocket.chat)
-* [Matrix](https://matrix.org)
-* [Steam](https://store.steampowered.com/)
-* [Twitch](https://twitch.tv)
-* [Ssh-chat](https://github.com/shazow/ssh-chat)
-* [WhatsApp](https://www.whatsapp.com/)
-* [Zulip](https://zulipchat.com)
+- [Mattermost](https://github.com/mattermost/mattermost-server/) 4.x, 5.x
+- [IRC](http://www.mirc.com/servers.html)
+- [XMPP](https://xmpp.org)
+- [Gitter](https://gitter.im)
+- [Slack](https://slack.com)
+- [Discord](https://discordapp.com)
+- [Telegram](https://telegram.org)
+- [Rocket.chat](https://rocket.chat)
+- [Matrix](https://matrix.org)
+- [Steam](https://store.steampowered.com/)
+- [Twitch](https://twitch.tv)
+- [Ssh-chat](https://github.com/shazow/ssh-chat)
+- [WhatsApp](https://www.whatsapp.com/)
+- [Zulip](https://zulipchat.com)
+- [Keybase](https://keybase.io)
 
 ### 3rd party via matterbridge api
-* [Minecraft](https://github.com/elytra/MatterLink)
-* [Reddit](https://github.com/bonehurtingjuice/mattereddit)
-* [Facebook messenger](https://github.com/VictorNine/fbridge)
-* [Discourse](https://github.com/DeclanHoare/matterbabble)
+
+- [Minecraft](https://github.com/elytra/MatterLink)
+- [Reddit](https://github.com/bonehurtingjuice/mattereddit)
+- [Facebook messenger](https://github.com/VictorNine/fbridge)
+- [Discourse](https://github.com/DeclanHoare/matterbabble)
 
 ### API
+
 The API is basic at the moment.
 More info and examples on the [wiki](https://github.com/42wim/matterbridge/wiki/Api).
 
 Used by the projects below. Feel free to make a PR to add your project to this list.
 
-* [MatterLink](https://github.com/elytra/MatterLink) (Matterbridge link for Minecraft Server chat)
-* [pyCord](https://github.com/NikkyAI/pyCord) (crossplatform chatbot)
-* [Mattereddit](https://github.com/bonehurtingjuice/mattereddit) (Reddit chat support)
-* [fbridge](https://github.com/VictorNine/fbridge) (Facebook messenger support)
-* [matterbabble](https://github.com/DeclanHoare/matterbabble) (Discourse support)
+- [MatterLink](https://github.com/elytra/MatterLink) (Matterbridge link for Minecraft Server chat)
+- [pyCord](https://github.com/NikkyAI/pyCord) (crossplatform chatbot)
+- [Mattereddit](https://github.com/bonehurtingjuice/mattereddit) (Reddit chat support)
+- [fbridge](https://github.com/VictorNine/fbridge) (Facebook messenger support)
+- [matterbabble](https://github.com/DeclanHoare/matterbabble) (Discourse support)
 
 ## Chat with us
 
 Questions or want to test on your favorite platform? Join below:
 
-* [Gitter][mb-gitter]
-* [IRC][mb-irc]
-* [Discord][mb-discord]
-* [Matrix][mb-matrix]
-* [Slack][mb-slack]
-* [Mattermost][mb-mattermost]
-* [Rocket.Chat][mb-rocketchat]
-* [XMPP][mb-xmpp] (matterbridge@conference.jabber.de)
-* [Twitch][mb-twitch]
-* [Zulip][mb-zulip]
-* [Telegram][mb-telegram]
+- [Gitter][mb-gitter]
+- [IRC][mb-irc]
+- [Discord][mb-discord]
+- [Matrix][mb-matrix]
+- [Slack][mb-slack]
+- [Mattermost][mb-mattermost]
+- [Rocket.Chat][mb-rocketchat]
+- [XMPP][mb-xmpp] (matterbridge@conference.jabber.de)
+- [Twitch][mb-twitch]
+- [Zulip][mb-zulip]
+- [Telegram][mb-telegram]
 
 ## Screenshots
+
 See https://github.com/42wim/matterbridge/wiki
 
 ## Installing / upgrading
+
 ### Binaries
-* Latest stable release [v1.15.1](https://github.com/42wim/matterbridge/releases/latest)
-* Development releases (follows master) can be downloaded [here](https://dl.bintray.com/42wim/nightly/)
+
+- Latest stable release [v1.15.1](https://github.com/42wim/matterbridge/releases/latest)
+- Development releases (follows master) can be downloaded [here](https://dl.bintray.com/42wim/nightly/)
 
 To install or upgrade just download the latest [binary](https://github.com/42wim/matterbridge/releases/latest) and follow the instructions on the [howto](https://github.com/42wim/matterbridge/wiki/How-to-create-your-config) for a step by step walkthrough for creating your configuration.
 
 ### Packages
-* [Overview](https://repology.org/metapackage/matterbridge/versions)
+
+- [Overview](https://repology.org/metapackage/matterbridge/versions)
 
 ## Building
+
 Most people just want to use binaries, you can find those [here](https://github.com/42wim/matterbridge/releases/latest)
 
 If you really want to build from source, follow these instructions:
 Go 1.9+ is required. Make sure you have [Go](https://golang.org/doc/install) properly installed, including setting up your [GOPATH](https://golang.org/doc/code.html#GOPATH).
 
-After Go is setup, download matterbridge to your $GOPATH directory.
+After Go is setup, download matterbridge to your \$GOPATH directory.
 
 ```
 cd $GOPATH
@@ -158,17 +171,23 @@ matterbridge
 ```
 
 ## Configuration
+
 ### Basic configuration
+
 See [howto](https://github.com/42wim/matterbridge/wiki/How-to-create-your-config) for a step by step walkthrough for creating your configuration.
 
 ### Settings
+
 All possible [settings](https://github.com/42wim/matterbridge/wiki/Settings) for each bridge.
 
 ### Advanced configuration
-* [matterbridge.toml.sample](https://github.com/42wim/matterbridge/blob/master/matterbridge.toml.sample) for documentation and an example.
+
+- [matterbridge.toml.sample](https://github.com/42wim/matterbridge/blob/master/matterbridge.toml.sample) for documentation and an example.
 
 ### Examples
+
 #### Bridge mattermost (off-topic) - irc (#testing)
+
 ```toml
 [irc]
     [irc.freenode]
@@ -197,6 +216,7 @@ enable=true
 ```
 
 #### Bridge slack (#general) - discord (general)
+
 ```toml
 [slack]
 [slack.test]
@@ -241,12 +261,15 @@ Usage of ./matterbridge:
 ```
 
 ### Docker
+
 Create your matterbridge.toml file locally eg in `/tmp/matterbridge.toml`
+
 ```
 docker run -ti -v /tmp/matterbridge.toml:/matterbridge.toml 42wim/matterbridge
 ```
 
 ## Changelog
+
 See [changelog.md](https://github.com/42wim/matterbridge/blob/master/changelog.md)
 
 ## FAQ
@@ -254,28 +277,30 @@ See [changelog.md](https://github.com/42wim/matterbridge/blob/master/changelog.m
 See [FAQ](https://github.com/42wim/matterbridge/wiki/FAQ)
 
 ## Related projects
-* [FOSSRIT/infrastructure - roles/matterbridge](https://github.com/FOSSRIT/infrastructure/tree/master/roles/matterbridge) (Ansible role used to automate deployments of Matterbridge)
-* [matterbridge autoconfig](https://github.com/patcon/matterbridge-autoconfig)
-* [matterbridge config viewer](https://github.com/patcon/matterbridge-heroku-viewer)
-* [matterbridge-heroku](https://github.com/cadecairos/matterbridge-heroku)
-* [mattereddit](https://github.com/bonehurtingjuice/mattereddit)
-* [matterlink](https://github.com/elytra/MatterLink)
-* [mattermost-plugin](https://github.com/matterbridge/mattermost-plugin) - Run matterbridge as a plugin in mattermost
-* [pyCord](https://github.com/NikkyAI/pyCord) (crossplatform chatbot)
-* [fbridge](https://github.com/VictorNine/fbridge) (Facebook messenger support)
-* [isla](https://github.com/alphachung/isla) (Bot for Discord-Telegram groups used alongside matterbridge)
-* [matterbabble](https://github.com/DeclanHoare/matterbabble) (Connect Discourse threads to Matterbridge)
+
+- [FOSSRIT/infrastructure - roles/matterbridge](https://github.com/FOSSRIT/infrastructure/tree/master/roles/matterbridge) (Ansible role used to automate deployments of Matterbridge)
+- [matterbridge autoconfig](https://github.com/patcon/matterbridge-autoconfig)
+- [matterbridge config viewer](https://github.com/patcon/matterbridge-heroku-viewer)
+- [matterbridge-heroku](https://github.com/cadecairos/matterbridge-heroku)
+- [mattereddit](https://github.com/bonehurtingjuice/mattereddit)
+- [matterlink](https://github.com/elytra/MatterLink)
+- [mattermost-plugin](https://github.com/matterbridge/mattermost-plugin) - Run matterbridge as a plugin in mattermost
+- [pyCord](https://github.com/NikkyAI/pyCord) (crossplatform chatbot)
+- [fbridge](https://github.com/VictorNine/fbridge) (Facebook messenger support)
+- [isla](https://github.com/alphachung/isla) (Bot for Discord-Telegram groups used alongside matterbridge)
+- [matterbabble](https://github.com/DeclanHoare/matterbabble) (Connect Discourse threads to Matterbridge)
 
 ## Articles
-* [matterbridge on kubernetes](https://medium.freecodecamp.org/using-kubernetes-to-deploy-a-chat-gateway-or-when-technology-works-like-its-supposed-to-a169a8cd69a3)
-* https://mattermost.com/blog/connect-irc-to-mattermost/
-* https://blog.valvin.fr/2016/09/17/mattermost-et-un-channel-irc-cest-possible/
-* https://blog.brightscout.com/top-10-mattermost-integrations/
-* http://bencey.co.nz/2018/09/17/bridge/
-* https://www.algoo.fr/blog/2018/01/19/recouvrez-votre-liberte-en-quittant-slack-pour-un-mattermost-auto-heberge/
-* https://kopano.com/blog/matterbridge-bridging-mattermost-chat/
-* https://www.stitcher.com/s/?eid=52382713
-* https://daniele.tech/2019/02/how-to-use-matterbridge-to-connect-2-different-slack-workspaces/
+
+- [matterbridge on kubernetes](https://medium.freecodecamp.org/using-kubernetes-to-deploy-a-chat-gateway-or-when-technology-works-like-its-supposed-to-a169a8cd69a3)
+- https://mattermost.com/blog/connect-irc-to-mattermost/
+- https://blog.valvin.fr/2016/09/17/mattermost-et-un-channel-irc-cest-possible/
+- https://blog.brightscout.com/top-10-mattermost-integrations/
+- http://bencey.co.nz/2018/09/17/bridge/
+- https://www.algoo.fr/blog/2018/01/19/recouvrez-votre-liberte-en-quittant-slack-pour-un-mattermost-auto-heberge/
+- https://kopano.com/blog/matterbridge-bridging-mattermost-chat/
+- https://www.stitcher.com/s/?eid=52382713
+- https://daniele.tech/2019/02/how-to-use-matterbridge-to-connect-2-different-slack-workspaces/
 
 ## Thanks
 
@@ -287,34 +312,37 @@ See [FAQ](https://github.com/42wim/matterbridge/wiki/FAQ)
 </p>
 
 Matterbridge wouldn't exist without these libraries:
-* discord - https://github.com/bwmarrin/discordgo
-* echo - https://github.com/labstack/echo
-* gitter - https://github.com/sromku/go-gitter
-* gops - https://github.com/google/gops
-* gozulipbot - https://github.com/ifo/gozulipbot
-* irc - https://github.com/lrstanley/girc
-* mattermost - https://github.com/mattermost/mattermost-server
-* matrix - https://github.com/matrix-org/gomatrix
-* sshchat - https://github.com/shazow/ssh-chat
-* slack - https://github.com/nlopes/slack
-* steam - https://github.com/Philipp15b/go-steam
-* telegram - https://github.com/go-telegram-bot-api/telegram-bot-api
-* xmpp - https://github.com/mattn/go-xmpp
-* whatsapp - https://github.com/Rhymen/go-whatsapp/
-* zulip - https://github.com/ifo/gozulipbot
-* tengo - https://github.com/d5/tengo
+
+- discord - https://github.com/bwmarrin/discordgo
+- echo - https://github.com/labstack/echo
+- gitter - https://github.com/sromku/go-gitter
+- gops - https://github.com/google/gops
+- gozulipbot - https://github.com/ifo/gozulipbot
+- irc - https://github.com/lrstanley/girc
+- mattermost - https://github.com/mattermost/mattermost-server
+- matrix - https://github.com/matrix-org/gomatrix
+- sshchat - https://github.com/shazow/ssh-chat
+- slack - https://github.com/nlopes/slack
+- steam - https://github.com/Philipp15b/go-steam
+- telegram - https://github.com/go-telegram-bot-api/telegram-bot-api
+- xmpp - https://github.com/mattn/go-xmpp
+- whatsapp - https://github.com/Rhymen/go-whatsapp/
+- zulip - https://github.com/ifo/gozulipbot
+- tengo - https://github.com/d5/tengo
+- keybase - https://github.com/keybase/go-keybase-chat-bot
 
 <!-- Links -->
 
-   [mb-gitter]: https://gitter.im/42wim/matterbridge
-   [mb-irc]: https://webchat.freenode.net/?channels=matterbridgechat
-   [mb-discord]: https://discord.gg/AkKPtrQ
-   [mb-matrix]: https://riot.im/app/#/room/#matterbridge:matrix.org
-   [mb-slack]: https://join.slack.com/matterbridgechat/shared_invite/MjEwODMxNjU1NDMwLTE0OTk2MTU3NTMtMzZkZmRiNDZhOA
-   [mb-mattermost]: https://framateam.org/signup_user_complete/?id=tfqm33ggop8x3qgu4boeieta6e
-   [mb-rocketchat]: https://open.rocket.chat/channel/matterbridge
-   [mb-xmpp]: https://inverse.chat/
-   [mb-twitch]: https://www.twitch.tv/matterbridge
-   [mb-whatsapp]: https://www.whatsapp.com/
-   [mb-zulip]: https://matterbridge.zulipchat.com/register/
-   [mb-telegram]: https://t.me/Matterbridge
+[mb-gitter]: https://gitter.im/42wim/matterbridge
+[mb-irc]: https://webchat.freenode.net/?channels=matterbridgechat
+[mb-discord]: https://discord.gg/AkKPtrQ
+[mb-matrix]: https://riot.im/app/#/room/#matterbridge:matrix.org
+[mb-slack]: https://join.slack.com/matterbridgechat/shared_invite/MjEwODMxNjU1NDMwLTE0OTk2MTU3NTMtMzZkZmRiNDZhOA
+[mb-mattermost]: https://framateam.org/signup_user_complete/?id=tfqm33ggop8x3qgu4boeieta6e
+[mb-rocketchat]: https://open.rocket.chat/channel/matterbridge
+[mb-xmpp]: https://inverse.chat/
+[mb-twitch]: https://www.twitch.tv/matterbridge
+[mb-whatsapp]: https://www.whatsapp.com/
+[mb-keybase]: https://keybase.io
+[mb-zulip]: https://matterbridge.zulipchat.com/register/
+[mb-telegram]: https://t.me/Matterbridge