slack: filter zero-width characters

.gitignore

@@ -73,3 +73,4 @@ util/files
 gus.sh
 rathaus.sh
 run.sh
+impact.ttf

connectors/slackapp/slackApp.go

@@ -17,6 +17,8 @@ import (
 	"text/template"
 	"time"
 
+	zerowidth "github.com/trubitsyn/go-zero-width"
+
 	"github.com/rs/zerolog/log"
 
 	"github.com/slack-go/slack"
@@ -419,6 +421,7 @@ func (s *SlackApp) buildMessage(m *slackevents.MessageEvent) msg.Message {
 
 	// Slack likes to put these NBSP in and it screws with matching later
 	text = strings.ReplaceAll(text, "\u00a0", " ")
+	text = zerowidth.RemoveZeroWidthCharacters(text)
 
 	isCmd, text := bot.IsCmd(s.config, text)
 

go.mod

@@ -54,6 +54,7 @@ require (
 	github.com/stretchr/objx v0.2.0 // indirect
 	github.com/stretchr/testify v1.4.0
 	github.com/temoto/robotstxt v1.1.1 // indirect
+	github.com/trubitsyn/go-zero-width v1.0.1 // indirect
 	github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2 // indirect
 	github.com/ttacon/libphonenumber v1.1.0 // indirect
 	github.com/velour/chat v0.0.0-20180713122344-fd1d1606cb89

go.sum

@@ -139,6 +139,8 @@ github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJy
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/temoto/robotstxt v1.1.1 h1:Gh8RCs8ouX3hRSxxK7B1mO5RFByQ4CmJZDwgom++JaA=
 github.com/temoto/robotstxt v1.1.1/go.mod h1:+1AmkuG3IYkh1kv0d2qEB9Le88ehNO0zwOr3ujewlOo=
+github.com/trubitsyn/go-zero-width v1.0.1 h1:AAZhtyGXW79T5BouAF0R9FtDhGcp7IGbLZo2Id3N+m8=
+github.com/trubitsyn/go-zero-width v1.0.1/go.mod h1:gGhBV4CZHjqXBYSgaxTCKZj+dXJndhdm1zAtAChtIUI=
 github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2 h1:5u+EJUQiosu3JFX0XS0qTf5FznsMOzTjGqavBGuCbo0=
 github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2/go.mod h1:4kyMkleCiLkgY6z8gK5BkI01ChBtxR0ro3I1ZDcGM3w=
 github.com/ttacon/libphonenumber v1.1.0 h1:tC6kE4t8UI4OqQVQjW5q8gSWhG2wnY5moEpSEORdYm4=