Add initial files

bot.go

@@ -0,0 +1,507 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"fmt"
+	"log"
+	"math"
+	"net/http"
+	"os"
+	"regexp"
+	"strings"
+
+	"github.com/gotd/td/session"
+	"github.com/gotd/td/telegram"
+	"github.com/gotd/td/telegram/auth"
+	"github.com/gotd/td/telegram/updates"
+	"github.com/gotd/td/tg"
+	"golang.org/x/term"
+	"gopkg.in/yaml.v3"
+)
+
+type YAMLScamPattern struct {
+	Name    string  `yaml:"name"`
+	Pattern string  `yaml:"pattern"`
+	Weight  float64 `yaml:"weight"`
+}
+
+type Config struct {
+	APIId         int               `yaml:"api_id"`
+	APIHash       string            `yaml:"api_hash"`
+	MonitoredChat int64             `yaml:"monitored_chat"`
+	AlertChat     int64             `yaml:"alert_chat"`
+	NtfyToken     string            `yaml:"ntfy_token"`
+	NtfyTopic     string            `yaml:"ntfy_topic"`
+	SessionPath   string            `yaml:"session_path"`
+	YAMLPatterns  []YAMLScamPattern `yaml:"scam_patterns"`
+	Patterns      []scamPattern     `yaml:"-"` // Compiled patterns, not from YAML
+}
+
+func loadConfig(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			// Create default config file
+			defaultConfig := `api_id: 0
+api_hash: ""
+monitored_chat: 0
+alert_chat: 0
+ntfy_token: ""
+ntfy_topic: ""
+session_path: "antiscam.session"
+scam_patterns: []
+`
+			if err := os.WriteFile(path, []byte(defaultConfig), 0644); err != nil {
+				return nil, fmt.Errorf("creating default config file: %w", err)
+			}
+			log.Printf("Created default config file at %s. Please fill in the required values.", path)
+			data = []byte(defaultConfig)
+		} else {
+			return nil, fmt.Errorf("reading config file: %w", err)
+		}
+	}
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config: %w", err)
+	}
+
+	// Validate required fields
+	if cfg.APIId == 0 {
+		return nil, fmt.Errorf("api_id is not set in config")
+	}
+	if cfg.APIHash == "" {
+		return nil, fmt.Errorf("api_hash is not set in config")
+	}
+	if cfg.MonitoredChat == 0 {
+		return nil, fmt.Errorf("monitored_chat is not set in config")
+	}
+	if cfg.SessionPath == "" {
+		return nil, fmt.Errorf("session_path is not set in config")
+	}
+
+	// Compile patterns from YAML
+	if len(cfg.YAMLPatterns) > 0 {
+		cfg.Patterns = make([]scamPattern, len(cfg.YAMLPatterns))
+		for i, p := range cfg.YAMLPatterns {
+			re, err := regexp.Compile(p.Pattern)
+			if err != nil {
+				return nil, fmt.Errorf("compiling pattern %q: %w", p.Name, err)
+			}
+			cfg.Patterns[i] = scamPattern{
+				name:   p.Name,
+				re:     re,
+				weight: p.Weight,
+			}
+		}
+		log.Printf("✓ Loaded %d scam patterns from YAML config:", len(cfg.Patterns))
+		for _, p := range cfg.Patterns {
+			log.Printf("  - %s (%s) (weight: %.1f)", p.name, p.re, p.weight)
+		}
+	}
+
+	return &cfg, nil
+}
+
+type scamPattern struct {
+	name   string
+	re     *regexp.Regexp
+	weight float64
+}
+
+type matchResult struct {
+	score           float64
+	matchedKeywords map[string][]string
+}
+
+var scamPatterns = []scamPattern{
+	{
+		name:   "seeking",
+		re:     regexp.MustCompile(`(?i)(?:(?:several\s+people|seeking|looking\s+for)\s+(?:partner|(\d+\s*[-–]\s*\d+|\d+)|two)?)|(new\s+project)`),
+		weight: 0.5,
+	},
+	{
+		name:   "job_opportunity",
+		re:     regexp.MustCompile(`(?i)(?:remote|earning|in\s+a)\s+(?:collaboration|growing\s+field|opportunity|work)`),
+		weight: 0.4,
+	},
+	{
+		name:   "money",
+		re:     regexp.MustCompile(`(?i)(?:\d+[\s,]*(?:\$|€|₹|£)|(?:\$|€|₹|£)\s*\d+,?\d+)(\s+per\s+(week|day))?`),
+		weight: 0.6,
+	},
+	{
+		name:   "contact",
+		re:     regexp.MustCompile(`(?i)(?:\bdm\b|(send|write).*(?:private)?\s+.?\+.?|get\s+in\s+touch)|@\w+`),
+		weight: 0.5,
+	},
+	{
+		name:   "links",
+		re:     regexp.MustCompile(`https://t\.me/\+\S+|https://t\.me/[a-z0-9_]+`),
+		weight: 0.5,
+	},
+	{
+		name:   "call_to_action",
+		re:     regexp.MustCompile(`(?i)[⬇👇👆⬆💬🪂🎯⤵⤴📍]+|(?:click|tap|join|link|check)\s+(?:here|now|below|out)`),
+		weight: 0.5,
+	},
+	{
+		name:   "extended_latin",
+		re:     regexp.MustCompile(`(?i)[äöüß]+`),
+		weight: 0.2,
+	},
+}
+
+func keywordMatchScore(input string, patterns []scamPattern) matchResult {
+	matched := make(map[string][]string)
+	totalScore := 0.0
+
+	for _, p := range patterns {
+		var matches []string
+		for _, m := range p.re.FindAllString(input, -1) {
+			m = strings.TrimSpace(m)
+			if m != "" {
+				matches = append(matches, m)
+			}
+		}
+		if len(matches) > 0 {
+			matched[p.name] = matches
+			totalScore += p.weight
+		}
+	}
+
+	score := math.Min(totalScore, 1.0)
+	// Round to 2 decimal places
+	score = math.Round(score*100) / 100
+
+	return matchResult{score: score, matchedKeywords: matched}
+}
+
+func escapeMarkdown(text string) string {
+	escapeChars := `\_*[]()~` + "`" + `>#+-=|{}.!`
+	var result strings.Builder
+	for _, r := range text {
+		if strings.ContainsRune(escapeChars, r) {
+			result.WriteRune('\\')
+		}
+		result.WriteRune(r)
+	}
+	return result.String()
+}
+
+func notify(message, topic, title string, priority int, token string) {
+	url := "https://ntfy.zio.sh/" + topic
+	req, err := http.NewRequest("POST", url, bytes.NewBufferString(message))
+	if err != nil {
+		log.Printf("notify: creating request: %v", err)
+		return
+	}
+	if title != "" {
+		req.Header.Set("Title", title)
+	}
+	req.Header.Set("Priority", fmt.Sprintf("%d", priority))
+	req.Header.Set("Markdown", "yes")
+	if token != "" {
+		// ntfy uses basic auth with empty username and token as password
+		encoded := base64.StdEncoding.EncodeToString([]byte(":" + token))
+		req.Header.Set("Authorization", "Basic "+encoded)
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Printf("notify: sending request: %v", err)
+		return
+	}
+	defer resp.Body.Close()
+}
+
+func resolveAlertPeer(ctx context.Context, api *tg.Client, cfg *Config) (*tg.InputPeerChannel, error) {
+	result, err := api.MessagesGetDialogs(ctx, &tg.MessagesGetDialogsRequest{
+		OffsetPeer: &tg.InputPeerEmpty{},
+		Limit:      100,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	var chats []tg.ChatClass
+
+	switch v := result.(type) {
+	case *tg.MessagesDialogs:
+		chats = v.Chats
+	case *tg.MessagesDialogsSlice:
+		chats = v.Chats
+	case *tg.MessagesDialogsNotModified:
+		return nil, fmt.Errorf("dialogs not modified")
+	default:
+		return nil, fmt.Errorf("unexpected dialogs type: %T", result)
+	}
+
+	for _, chat := range chats {
+		if channel, ok := chat.(*tg.Channel); ok {
+			if channel.ID == cfg.AlertChat {
+				return &tg.InputPeerChannel{
+					ChannelID:  channel.ID,
+					AccessHash: channel.AccessHash,
+				}, nil
+			}
+		}
+	}
+
+	return nil, fmt.Errorf("alert channel %d not found", cfg.AlertChat)
+}
+
+func handleNewMessage(ctx context.Context, api *tg.Client, alertPeer *tg.InputPeerChannel, cfg *Config, entities tg.Entities, update any) error {
+	// Extract message from either UpdateNewMessage or UpdateNewChannelMessage
+	var msg *tg.Message
+	switch u := update.(type) {
+	case *tg.UpdateNewMessage:
+		m, ok := u.Message.(*tg.Message)
+		if !ok {
+			return nil
+		}
+		msg = m
+	case *tg.UpdateNewChannelMessage:
+		m, ok := u.Message.(*tg.Message)
+		if !ok {
+			return nil
+		}
+		msg = m
+	default:
+		log.Printf("DEBUG: unknown update type %T", update)
+		return nil
+	}
+
+	// Only process messages sent by the bot (Out=true)
+	if msg.Out {
+		return nil
+	}
+
+	// Check if from monitored supergroup (channels in gotd terminology)
+	peerChannel, ok := msg.PeerID.(*tg.PeerChannel)
+	if !ok || int64(peerChannel.ChannelID) != cfg.MonitoredChat {
+		return nil
+	}
+	log.Printf("✓ Processing message in chat %v: %s", msg.PeerID, msg.Message)
+	chatID := int64(peerChannel.ChannelID)
+
+	// Use YAML patterns if available, otherwise use defaults
+	patterns := cfg.Patterns
+	if len(patterns) == 0 {
+		patterns = scamPatterns
+		log.Printf("Using hardcoded scam patterns (%d patterns)", len(patterns))
+	} else {
+		log.Printf("Using YAML-loaded scam patterns (%d patterns)", len(patterns))
+	}
+
+	// Score the message
+	result := keywordMatchScore(msg.Message, patterns)
+
+	if extended_latin, ok := result.matchedKeywords["extended_latin"]; ok {
+		for range extended_latin {
+			result.score += 0.1
+			if result.score >= 1.0 {
+				result.score = 1.0
+				break
+			}
+		}
+	}
+
+	if result.score < 1.0 {
+		return nil
+	}
+
+	log.Printf("Matched message with score %.2f", result.score)
+	for key, values := range result.matchedKeywords {
+		for _, value := range values {
+			log.Printf("  %s: %s", key, value)
+		}
+	}
+
+	// Delete the message from supergroup
+	channel, ok := entities.Channels[chatID]
+	if !ok {
+		return fmt.Errorf("channel %d not found in entities", chatID)
+	}
+	_, err := api.ChannelsDeleteMessages(ctx, &tg.ChannelsDeleteMessagesRequest{
+		Channel: &tg.InputChannel{
+			ChannelID:  chatID,
+			AccessHash: channel.AccessHash,
+		},
+		ID: []int{msg.ID},
+	})
+	if err != nil {
+		log.Printf("Failed to delete message: %v", err)
+	}
+
+	// Get sender info
+	var senderID int64
+	if fromID, ok := msg.FromID.(*tg.PeerUser); ok {
+		senderID = int64(fromID.UserID)
+	} else {
+		return fmt.Errorf("could not determine sender")
+	}
+
+	user, ok := entities.Users[senderID]
+	if !ok {
+		return fmt.Errorf("user %d not found in entities", senderID)
+	}
+
+	displayName := user.FirstName
+	if user.LastName != "" {
+		displayName += " " + user.LastName
+	}
+	displayName = strings.TrimSpace(displayName)
+
+	username := "no username"
+	if user.Username != "" {
+		username = "@" + user.Username
+	}
+
+	// Restrict sender in supergroup
+	_, err = api.ChannelsEditBanned(ctx, &tg.ChannelsEditBannedRequest{
+		Channel: &tg.InputChannel{
+			ChannelID:  chatID,
+			AccessHash: channel.AccessHash,
+		},
+		Participant: &tg.InputPeerUser{
+			UserID:     senderID,
+			AccessHash: user.AccessHash,
+		},
+		BannedRights: tg.ChatBannedRights{
+			SendMessages: true,
+			SendMedia:    true,
+			SendStickers: true,
+			SendGifs:     true,
+			UntilDate:    0,
+		},
+	})
+	if err != nil {
+		log.Printf("Failed to restrict user %d: %v", senderID, err)
+	}
+
+	// Get supergroup name
+	chatName := channel.Title
+
+	// Build and send alert message
+	matchMessage := fmt.Sprintf("🚨 Matched\n**Score**: %.2f\n**Chat**: %s (ID: %d)\n**User**: %s (%s) (ID: %d)\n",
+		result.score, escapeMarkdown(chatName), chatID, escapeMarkdown(displayName+" ("+username+")"), username, senderID)
+
+	// Send ntfy notification if config set
+	if cfg.NtfyToken != "" || cfg.NtfyTopic != "" {
+		notify(matchMessage, cfg.NtfyTopic, fmt.Sprintf("Scam Alert: %s", chatName), 5, cfg.NtfyToken)
+	}
+
+	// Send alert message to alert chat
+	_, err = api.MessagesSendMessage(ctx, &tg.MessagesSendMessageRequest{
+		Peer:    alertPeer,
+		Message: matchMessage,
+	})
+	if err != nil {
+		log.Printf("Failed to send alert message: %v", err)
+	}
+
+	return nil
+}
+
+func main() {
+	ctx := context.Background()
+
+	// Load configuration
+	configPath := "config.yaml"
+	if len(os.Args) > 1 {
+		configPath = os.Args[1]
+	}
+
+	cfg, err := loadConfig(configPath)
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
+
+	dispatcher := tg.NewUpdateDispatcher()
+	gapManager := updates.New(updates.Config{Handler: dispatcher})
+
+	client := telegram.NewClient(cfg.APIId, cfg.APIHash, telegram.Options{
+		UpdateHandler:  gapManager,
+		SessionStorage: &session.FileStorage{Path: cfg.SessionPath},
+	})
+
+	err = client.Run(ctx, func(ctx context.Context) error {
+		// Check if session exists; if not, authenticate
+		_, err := os.Stat(cfg.SessionPath)
+		if err != nil {
+			// Session doesn't exist, prompt for credentials
+			fmt.Print("Enter phone number: ")
+			var phone string
+			fmt.Scanln(&phone)
+
+			fmt.Print("Enter 2FA password: ")
+			pwBytes, err := term.ReadPassword(0)
+			if err != nil {
+				return fmt.Errorf("reading password: %w", err)
+			}
+			fmt.Println()
+			password := string(pwBytes)
+
+			flow := auth.NewFlow(
+				auth.Constant(
+					phone,
+					password,
+					auth.CodeAuthenticatorFunc(func(ctx context.Context, sentCode *tg.AuthSentCode) (string, error) {
+						fmt.Print("Enter code: ")
+						var code string
+						fmt.Scanln(&code)
+						return code, nil
+					}),
+				),
+				auth.SendCodeOptions{},
+			)
+
+			if err := client.Auth().IfNecessary(ctx, flow); err != nil {
+				return err
+			}
+		}
+
+		api := client.API()
+
+		// Resolve alert channel peer at startup
+		alertPeer, err := resolveAlertPeer(ctx, api, cfg)
+		if err != nil {
+			return fmt.Errorf("resolving alert peer: %w", err)
+		}
+
+		// Register message handler for private/group messages
+		dispatcher.OnNewMessage(func(ctx context.Context, entities tg.Entities, update *tg.UpdateNewMessage) error {
+			return handleNewMessage(ctx, api, alertPeer, cfg, entities, update)
+		})
+
+		// Register handler for channel messages (supergroups)
+		dispatcher.OnNewChannelMessage(func(ctx context.Context, entities tg.Entities, update *tg.UpdateNewChannelMessage) error {
+			return handleNewMessage(ctx, api, alertPeer, cfg, entities, update)
+		})
+
+		// Get self ID for updates manager
+		status, err := client.Auth().Status(ctx)
+		if err != nil {
+			return err
+		}
+
+		user := status.User
+		username := ""
+		if user.Username != "" {
+			username = " (@" + user.Username + ")"
+		}
+		displayName := user.FirstName
+		if user.LastName != "" {
+			displayName += " " + user.LastName
+		}
+		log.Printf("✓ Logged in as: %s%s (ID: %d)", displayName, username, user.ID)
+		log.Printf("✓ Bot running, monitoring chat %d", cfg.MonitoredChat)
+		return gapManager.Run(ctx, api, status.User.ID, updates.AuthOptions{})
+	})
+
+	if err != nil {
+		log.Fatal(err)
+	}
+}

go.mod

@@ -0,0 +1,47 @@
+module git.zio.sh/astra/telegram-antiscam
+
+go 1.25.3
+
+require (
+	github.com/gotd/td v0.139.0
+	golang.org/x/term v0.40.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/coder/websocket v1.8.14 // indirect
+	github.com/dlclark/regexp2 v1.11.5 // indirect
+	github.com/fatih/color v1.18.0 // indirect
+	github.com/ghodss/yaml v1.0.0 // indirect
+	github.com/go-faster/errors v0.7.1 // indirect
+	github.com/go-faster/jx v1.2.0 // indirect
+	github.com/go-faster/xor v1.0.0 // indirect
+	github.com/go-faster/yaml v0.4.6 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/gotd/ige v0.2.2 // indirect
+	github.com/gotd/neo v0.1.5 // indirect
+	github.com/klauspost/compress v1.18.3 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/ogen-go/ogen v1.16.0 // indirect
+	github.com/segmentio/asm v1.2.1 // indirect
+	github.com/shopspring/decimal v1.4.0 // indirect
+	go.opentelemetry.io/otel v1.40.0 // indirect
+	go.opentelemetry.io/otel/metric v1.40.0 // indirect
+	go.opentelemetry.io/otel/trace v1.40.0 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.1 // indirect
+	golang.org/x/crypto v0.47.0 // indirect
+	golang.org/x/exp v0.0.0-20230725093048-515e97ebf090 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	rsc.io/qr v0.2.0 // indirect
+)

go.sum

@@ -0,0 +1,104 @@
+github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
+github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/coder/websocket v1.8.14 h1:9L0p0iKiNOibykf283eHkKUHHrpG7f65OE3BhhO7v9g=
+github.com/coder/websocket v1.8.14/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dlclark/regexp2 v1.11.5 h1:Q/sSnsKerHeCkc/jSTNq1oCm7KiVgUMZRDUoRu0JQZQ=
+github.com/dlclark/regexp2 v1.11.5/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
+github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
+github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
+github.com/ghodss/yaml v1.0.0 h1:wQHKEahhL6wmXdzwWG11gIVCkOv05bNOh+Rxn0yngAk=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-faster/errors v0.7.1 h1:MkJTnDoEdi9pDabt1dpWf7AA8/BaSYZqibYyhZ20AYg=
+github.com/go-faster/errors v0.7.1/go.mod h1:5ySTjWFiphBs07IKuiL69nxdfd5+fzh1u7FPGZP2quo=
+github.com/go-faster/jx v1.2.0 h1:T2YHJPrFaYu21fJtUxC9GzmluKu8rVIFDwwGBKTDseI=
+github.com/go-faster/jx v1.2.0/go.mod h1:UWLOVDmMG597a5tBFPLIWJdUxz5/2emOpfsj9Neg0PE=
+github.com/go-faster/xor v0.3.0/go.mod h1:x5CaDY9UKErKzqfRfFZdfu+OSTfoZny3w5Ak7UxcipQ=
+github.com/go-faster/xor v1.0.0 h1:2o8vTOgErSGHP3/7XwA5ib1FTtUsNtwCoLLBjl31X38=
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