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

vendor/github.com/keybase/go-keybase-chat-bot/kbchat/test_utils.go

@@ -0,0 +1,54 @@
+package kbchat
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func randomString(t *testing.T) string {
+	bytes := make([]byte, 16)
+	_, err := rand.Read(bytes)
+	require.NoError(t, err)
+	return hex.EncodeToString(bytes)
+}
+
+func randomTempDir(t *testing.T) string {
+	return path.Join(os.TempDir(), "keybase_bot_"+randomString(t))
+}
+
+func whichKeybase(t *testing.T) string {
+	cmd := exec.Command("which", "keybase")
+	out, err := cmd.Output()
+	require.NoError(t, err)
+	location := strings.TrimSpace(string(out))
+	return location
+}
+
+func copyFile(t *testing.T, source, dest string) {
+	sourceData, err := ioutil.ReadFile(source)
+	require.NoError(t, err)
+	err = ioutil.WriteFile(dest, sourceData, 0777)
+	require.NoError(t, err)
+}
+
+// Creates the working directory and copies over the keybase binary in PATH.
+// We do this to avoid any version mismatch issues.
+func prepWorkingDir(t *testing.T, workingDir string) string {
+	kbLocation := whichKeybase(t)
+
+	err := os.Mkdir(workingDir, 0777)
+	require.NoError(t, err)
+	kbDestination := path.Join(workingDir, "keybase")
+
+	copyFile(t, kbLocation, kbDestination)
+
+	return kbDestination
+}