init

.gitignore

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+go.mod
+go.sum
+mastodon-group-bot

README.md

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+# Mastodon group bot
+
+This is a bot which implements group functionality in Mastodon.
+
+# Configuration
+
+The bot is configured in a JSON file that looks like this:
+
+```
+{
+    "Server":           "https://example.com",
+    "ClientID":         "0000000000000000000000000000000000000000000",
+    "ClientSecret":     "0000000000000000000000000000000000000000000",
+    "AccessToken":      "0000000000000000000000000000000000000000000",
+    "WelcomeMessage":   "We have a new member in our group. Please love and favor"
+}
+```
+
+# Building
+
+```
+go mod init mastodon-group-bot
+
+go mod tidy
+
+go build
+```
+
+# Usage
+
+```
+Usage of mastodon-group-bot:
+  -config string
+        Path to config (default "config.json")
+```

config.json

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+{
+    "Server":           "https://example.com",
+    "ClientID":         "0000000000000000000000000000000000000000000",
+    "ClientSecret":     "0000000000000000000000000000000000000000000",
+    "AccessToken":      "0000000000000000000000000000000000000000000",
+    "WelcomeMessage":   "We have a new member in our group. Please love and favor"
+}

main.go

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+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/mattn/go-mastodon"
+)
+
+func main() {
+	// Parse args
+	ConfPath := flag.String("config", "config.json", "Path to config")
+	flag.Parse()
+
+	// Reading config
+	type Config struct {
+		Server         string `json:"Server"`
+		ClientID       string `json:"ClientID"`
+		ClientSecret   string `json:"ClientSecret"`
+		AccessToken    string `json:"AccessToken"`
+		WelcomeMessage string `json:"WelcomeMessage"`
+	}
+
+	data, err := os.ReadFile(*ConfPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var Conf Config
+	json.Unmarshal(data, &Conf)
+
+	c := mastodon.NewClient(&mastodon.Config{
+		Server:       Conf.Server,
+		ClientID:     Conf.ClientID,
+		ClientSecret: Conf.ClientSecret,
+		AccessToken:  Conf.AccessToken,
+	})
+
+	ctx := context.Background()
+	events, err := c.StreamingUser(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	my_account, _ := c.GetAccountCurrentUser(ctx)
+	followers, _ := c.GetAccountFollowers(ctx, my_account.ID, &mastodon.Pagination{Limit: 60})
+	signed := false
+
+	// Run bot
+	for {
+		notifEvent, ok := (<-events).(*mastodon.NotificationEvent)
+		if !ok {
+			continue
+		}
+
+		notif := notifEvent.Notification
+
+		// Posting function
+		postToot := func(toot string, vis string) error {
+			conToot := mastodon.Toot{
+				Status:     toot,
+				Visibility: vis,
+			}
+			_, err := c.PostStatus(ctx, &conToot)
+			return err
+		}
+
+		// New subscriber
+		if notif.Type == "follow" {
+			var message = fmt.Sprintf("%s @%s", Conf.WelcomeMessage, notif.Account.Acct)
+			postToot(message, "public")
+		}
+
+		// Reblog toot
+		if notif.Type == "mention" {
+			sender := notif.Status.Account.Acct
+
+			// Subscription check
+			for i := 0; i < len(followers); i++ {
+				if sender == string(followers[i].Acct) {
+					signed = true
+				}
+			}
+
+			if signed {
+				c.Reblog(ctx, notif.Status.ID)
+			} else {
+				var message = fmt.Sprintf("@%s%s", notif.Account.Acct, ", you are not subscribed!")
+				postToot(message, "direct")
+			}
+		}
+	}
+}