feat: add discord-bot service

.gitignore

@@ -2,4 +2,5 @@ bazel-bin
 bazel-out
 bazel-roleypoly
 bazel-testlogs
-node_modules
+node_modules
+.env

.vscode/settings.json

@@ -1,6 +1,10 @@
 {
   "go.inferGopath": false,
-  "editor.tabSize": 4,
+  "editor.tabSize": 2,
   "editor.insertSpaces": true,
-  "editor.formatOnSave": true
+  "editor.formatOnSave": true,
+  "bazel.buildifierFixOnFormat": true,
+  "[starlark]": {
+    "editor.tabSize": 4
+  }
 }

README.md

@@ -10,53 +10,23 @@ Tame your Discord roles.
 
 ## Developing
 
-This is a meta-package for all of the sub-repos under Roleypoly. Because this is a distributed system, you might not need to develop on all of these at once to get something done. *Docs in future.*
+Roleypoly is a distributed system built with Go, React, Terraform, and Bazel.
 
 ### Prerequisites
 
-- [Discord OAuth/Bot Application](https://discordapp.com/developers)
-- Go 1.12+ w/ `GO111MODULES=on`
-- Node 12+
-- Yarn
-- [mkcert](https://github.com/FiloSottile/mkcert) for self-signing certs for `roleypoly.local *.roleypoly.local`
-- /etc/hosts entry for the above
+This app is known to work on Mac, Linux, and on WSL. Maintainer is typically using WSL.
 
-Some parts of development can be done online or integrated into the online systems hosted on roleypoly.com or canary.roleypoly.com.
+- **Required Tools**
+  - Bazel
+  - Python (required for Bazel)
+  - Docker
+  - Docker Compose
+  - mkcert
+- **Optional Tools**
+  - _Not having these isn't going to stop you from working on the app. Bazel is magic._
+  - ibazel
+  - Go 1.15+
+  - Node 14+
+  - Yarn
 
-### Repos
-
-- [**Aoi 青い**](https://github.com/roleypoly/aoi)
-  - https://aoi.roleypoly.com
-  - admin & devops dashboard
-  - go, typescript, react
-- [**Auth**](https://github.com/roleypoly/auth) 
-  - authentication, authorization, and session server. 
-  - go
-- [**Discord**](https://github.com/roleypoly/discord) 
-  - discord api client, and bot responder
-  - go
-- [**Design**](https://github.com/roleypoly/design)
-  - https://ui.roleypoly.com
-  - branding, ui kit, storybooks
-  - typescript, react
-- [**DevOps**](https://github.com/roleypoly/devops) 
-  - docker wiring and other tooling
-- [**Gripkit**](https://github.com/roleypoly/gripkit)
-  - gRPC wiring toolkit
-  - go
-- [**Platform**](https://github.com/roleypoly/platform) 
-  - main business logic, data & presentation layer
-  - go
-- [**RPC**](https://github.com/roleypoly/rpc) 
-  - protobuf definitions, grpc-go and grpc-web libraries
-- [**UI**](https://github.com/roleypoly/ui)
-  - https://roleypoly.com, https://canary.roleypoly.com
-  - frontend component
-  - node, express, typescript, react, next.js
-
-### Other Repos
-
-- [Docker Hub](https://hub.docker.com/u/roleypoly)
-- [npm](https://www.npmjs.com/org/roleypoly)
-- [GitHub](https://github.com/roleypoly)
-- [Original Repo](https://github.com/kayteh/roleypoly)
+Setup a `.env` file copied from `.env.example`.

deps.bzl

@@ -376,8 +376,8 @@ def go_repositories():
     go_repository(
         name = "com_github_lampjaw_discordclient",
         importpath = "github.com/lampjaw/discordclient",
-        sum = "h1:jrRFvccla3/+7EMUrQxpdwy0Jy1O3b0IK/k3KqJKoec=",
-        version = "v0.0.0-20200914142129-e3b4f5747970",
+        sum = "h1:Y2o9fEOoAYjCw8IDyxUVaBq44AUbOLyPnYSPpM6Ef3M=",
+        version = "v0.0.0-20200923011548-6558fc9e89df",
     )
     go_repository(
         name = "com_github_lib_pq",

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/golang/protobuf v1.4.2 // indirect
 	github.com/improbable-eng/grpc-web v0.13.0
 	github.com/joho/godotenv v1.3.0
-	github.com/lampjaw/discordclient v0.0.0-20200914142129-e3b4f5747970
+	github.com/lampjaw/discordclient v0.0.0-20200923011548-6558fc9e89df
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/rs/cors v1.7.0 // indirect

go.sum

@@ -92,6 +92,8 @@ github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqx
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/kayteh/discordclient v0.0.0-20200923010449-4b45cd745b2b h1:P/u6dpl89r9O7pDVkd4pCo57Bg/wfZD0VReSJh+JhqM=
+github.com/kayteh/discordclient v0.0.0-20200923010449-4b45cd745b2b/go.mod h1:lOfqvGl1HcXws86Sczusw1DyV5d0KHPtTTtdjneekto=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@@ -103,6 +105,8 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lampjaw/discordclient v0.0.0-20200914142129-e3b4f5747970 h1:jrRFvccla3/+7EMUrQxpdwy0Jy1O3b0IK/k3KqJKoec=
 github.com/lampjaw/discordclient v0.0.0-20200914142129-e3b4f5747970/go.mod h1:lOfqvGl1HcXws86Sczusw1DyV5d0KHPtTTtdjneekto=
+github.com/lampjaw/discordclient v0.0.0-20200923011548-6558fc9e89df h1:Y2o9fEOoAYjCw8IDyxUVaBq44AUbOLyPnYSPpM6Ef3M=
+github.com/lampjaw/discordclient v0.0.0-20200923011548-6558fc9e89df/go.mod h1:lOfqvGl1HcXws86Sczusw1DyV5d0KHPtTTtdjneekto=
 github.com/lib/pq v1.8.0 h1:9xohqzkUwzR4Ga4ivdTcawVS89YSDVxXMa3xJX3cGzg=
 github.com/lib/pq v1.8.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=

src/discord-bot/BUILD.bazel

@@ -3,11 +3,15 @@ load("@io_bazel_rules_docker//go:image.bzl", "go_image")
 
 go_library(
     name = "discord-bot_lib",
-    srcs = ["discordbot.go"],
+    srcs = [
+        "discordbot.go",
+        "listener.go",
+    ],
     importpath = "github.com/roleypoly/roleypoly/src/discord-bot",
     visibility = ["//visibility:private"],
     deps = [
         "//src/common/version",
+        "//src/discord-bot/internal/strings",
         "@com_github_bwmarrin_discordgo//:discordgo",
         "@com_github_joho_godotenv//autoload",
         "@com_github_lampjaw_discordclient//:discordclient",
@@ -16,13 +20,13 @@ go_library(
 )
 
 go_binary(
-    name = "discord-bot_bin",
+    name = "discord-bot",
     embed = [":discord-bot_lib"],
     visibility = ["//visibility:private"],
 )
 
 go_image(
-    name = "discord-bot",
+    name = "image",
     embed = [":discord-bot_lib"],
-    visibility = ["//visibility:public"],
+    visibility = ["//visibility:private"],
 )

src/discord-bot/discordbot.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"os/signal"
+	"regexp"
 	"strings"
 	"syscall"
 
@@ -13,15 +14,21 @@ import (
 	"k8s.io/klog"
 )
 
+var (
+	botToken    = os.Getenv("DISCORD_BOT_TOKEN")
+	botClientID = os.Getenv("DISCORD_CLIENT_ID")
+	rootUsers   = strings.Split(os.Getenv("ROOT_USERS"), ",")
+	allowedBots = strings.Split(os.Getenv("ALLOWED_BOTS"), ",")
+	appURL      = os.Getenv("PUBLIC_URL")
+
+	selfMention = regexp.MustCompile("<@!?" + botClientID + ">")
+)
+
 func main() {
 	klog.Info(version.StartupInfo("discord-bot"))
 
-	botToken := os.Getenv("DISCORD_BOT_TOKEN")
-	botClientID := os.Getenv("DISCORD_CLIENT_ID")
-	rootUsers := strings.Split(os.Getenv("ROOT_USERS"), ",")
-
 	discordClient := discordclient.NewDiscordClient(botToken, rootUsers[0], botClientID)
-	discordClient.GatewayIntents = discordgo.IntentsNone
+	discordClient.GatewayIntents = discordgo.IntentsGuildMessages
 
 	messageChannel, err := discordClient.Listen(-1)
 	if err != nil {
@@ -30,14 +37,21 @@ func main() {
 
 	defer awaitExit()
 
-	go processMessages(messageChannel)
+	l := listener{
+		client: discordClient,
+	}
+
+	go l.processMessages(messageChannel)
 }
 
-func processMessages(messageChannel <-chan discordclient.Message) {
-	for {
-		message := <-messageChannel
-		klog.Infoln("message: ", message.Message())
+func isBotAllowlisted(userID string) bool {
+	for _, id := range allowedBots {
+		if id == userID {
+			return true
+		}
 	}
+
+	return false
 }
 
 func awaitExit() {

src/discord-bot/internal/strings/BUILD.bazel

@@ -0,0 +1,11 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "strings",
+    srcs = [
+        "renderer.go",
+        "strings.go",
+    ],
+    importpath = "github.com/roleypoly/roleypoly/src/discord-bot/internal/strings",
+    visibility = ["//src/discord-bot:__subpackages__"],
+)

src/discord-bot/internal/strings/renderer.go

@@ -0,0 +1,13 @@
+package strings
+
+import (
+	"bytes"
+	"text/template"
+)
+
+// Render a template to string
+func Render(tmpl *template.Template, data interface{}) string {
+	buffer := &bytes.Buffer{}
+	tmpl.Execute(buffer, data)
+	return buffer.String()
+}

src/discord-bot/internal/strings/strings.go

@@ -0,0 +1,44 @@
+package strings
+
+import (
+	"text/template"
+)
+
+var (
+	// MentionResponse is a template that requires strings AppURL and GuildID.
+	MentionResponse = template.Must(
+		template.New("MentionResponse").Parse(
+			`:beginner: Assign your roles here! {{ .AppURL }}/s/{{ .GuildID }}`,
+		),
+	)
+
+	RootStats = template.Must(
+		template.New("RootStats").Parse(`🐈
+**People Stats**
+<:blank:676216695375003650>🙎‍♀️ **Total Users:** {{ .Users }}
+<:blank:676216695375003650>👨‍👩‍👦‍👦 **Total Guilds:** {{ .Guilds }}
+<:blank:676216695375003650>🦺 **Total Roles:** {{ .Roles }}
+
+**Bot Stats**
+<:blank:676216695375003650>🔩 **Total Shards:** {{ .Shards }}
+<:blank:676216695375003650>⚙️ **Revision:** {{ .GitCommit }} ({{ .GitBranch }})
+<:blank:676216695375003650>⏰ **Built at** {{ .BuildDate }}
+`,
+		),
+	)
+)
+
+type MentionResponseData struct {
+	AppURL  string
+	GuildID string
+}
+
+type RootStatsData struct {
+	Users     int
+	Guilds    int
+	Roles     int
+	Shards    int
+	GitCommit string
+	GitBranch string
+	BuildDate string
+}

src/discord-bot/listener.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"github.com/lampjaw/discordclient"
+	"k8s.io/klog"
+
+	"github.com/roleypoly/roleypoly/src/discord-bot/internal/strings"
+)
+
+type listener struct {
+	client *discordclient.DiscordClient
+}
+
+func (l *listener) processMessages(messageChannel <-chan discordclient.Message) {
+	for {
+		go l.handle(<-messageChannel)
+	}
+}
+
+func (l *listener) handle(message discordclient.Message) {
+	// Only if it's a message create
+	if message.Type() != discordclient.MessageTypeCreate {
+		return
+	}
+
+	// Only if it's an allowed bot
+	if message.IsBot() && !isBotAllowlisted(message.UserID()) {
+		return
+	}
+
+	// Only if it has the right mention
+	if !selfMention.MatchString(message.RawMessage()) {
+		return
+	}
+
+	l.defaultResponse(message)
+}
+
+func (l *listener) defaultResponse(message discordclient.Message) {
+	channel := message.Channel()
+	guild, err := message.ResolveGuildID()
+	if err != nil {
+		klog.Warning("failed to fetch guild, ", err)
+	}
+
+	l.client.SendMessage(
+		channel,
+		strings.Render(
+			strings.MentionResponse,
+			strings.MentionResponseData{GuildID: guild, AppURL: appURL},
+		),
+	)
+}

src/gripkit/gripkit.go

@@ -1,5 +1,5 @@
 // Package gripkit provides wrappers and helpers for
-package gripkit // import "github.com/roleypoly/gripkit"
+package gripkit
 
 import (
 	"net/http"