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memogram.go
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memogram.go
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package memogram
import (
"context"
"fmt"
"io"
"log/slog"
"net/http"
"path/filepath"
"strings"
"sync"
"github.com/go-telegram/bot"
"github.com/go-telegram/bot/models"
"github.com/pkg/errors"
v1pb "github.com/usememos/memos/proto/gen/api/v1"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/metadata"
)
// userAccessTokenCache is a cache for user access token.
// Key is the user id from telegram.
// Value is the access token from memos.
// TODO: save it to a persistent storage.
var userAccessTokenCache sync.Map // map[int64]string
type Service struct {
config *Config
client *MemosClient
bot *bot.Bot
}
func NewService() (*Service, error) {
config, err := getConfigFromEnv()
if err != nil {
return nil, errors.Wrap(err, "failed to get config from env")
}
conn, err := grpc.Dial(config.ServerAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
slog.Error("failed to connect to server", slog.Any("err", err))
return nil, errors.Wrap(err, "failed to connect to server")
}
client := NewMemosClient(conn)
s := &Service{
config: config,
client: client,
}
opts := []bot.Option{
bot.WithDefaultHandler(s.handler),
}
b, err := bot.New(config.BotToken, opts...)
if err != nil {
return nil, errors.Wrap(err, "failed to create bot")
}
s.bot = b
return s, nil
}
func (s *Service) Start(ctx context.Context) {
slog.Info("Memogram started")
// Try to get workspace profile.
workspaceProfile, err := s.client.WorkspaceService.GetWorkspaceProfile(ctx, &v1pb.GetWorkspaceProfileRequest{})
if err != nil {
slog.Error("failed to get workspace profile", slog.Any("err", err))
return
}
slog.Info("workspace profile", slog.Any("profile", workspaceProfile))
s.bot.Start(ctx)
}
func (s *Service) handler(ctx context.Context, b *bot.Bot, m *models.Update) {
if strings.HasPrefix(m.Message.Text, "/start ") {
s.startHandler(ctx, b, m)
return
}
userID := m.Message.From.ID
if _, ok := userAccessTokenCache.Load(userID); !ok {
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: "Please start the bot with /start <access_token>",
})
return
}
message := m.Message
// TODO: handle message.Entities to get markdown text.
content := message.Text
if message.Caption != "" {
content = message.Caption
}
// Add "forwarded from: originName" if message was forwarded
if m.Message.ForwardOrigin != nil {
var originName, originUsername string
// Determine the type of origin
switch origin := m.Message.ForwardOrigin; {
case origin.MessageOriginUser != nil: // User
user := origin.MessageOriginUser.SenderUser
if user.LastName != "" {
originName = fmt.Sprintf("%s %s", user.FirstName, user.LastName)
} else {
originName = user.FirstName
}
originUsername = user.Username
case origin.MessageOriginHiddenUser != nil: // Hidden User
hiddenUserName := origin.MessageOriginHiddenUser.SenderUserName
if hiddenUserName != "" {
originName = hiddenUserName
} else {
originName = "Hidden User"
}
case origin.MessageOriginChat != nil: // Chat
chat := origin.MessageOriginChat.SenderChat
originName = chat.Title
originUsername = chat.Username
case origin.MessageOriginChannel != nil: // Channel
channel := origin.MessageOriginChannel.Chat
originName = channel.Title
originUsername = channel.Username
}
if originUsername != "" {
content = fmt.Sprintf("Forwarded from [%s](https://t.me/%s)\n%s", originName, originUsername, content)
} else {
content = fmt.Sprintf("Forwarded from %s\n%s", originName, content)
}
}
hasResource := message.Document != nil || len(message.Photo) > 0 || message.Voice != nil || message.Video != nil
if content == "" && !hasResource {
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: "Please input memo content",
})
return
}
accessToken, _ := userAccessTokenCache.Load(userID)
ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken.(string))))
memo, err := s.client.MemoService.CreateMemo(ctx, &v1pb.CreateMemoRequest{
Content: content,
})
if err != nil {
slog.Error("failed to create memo", slog.Any("err", err))
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: "Failed to create memo",
})
return
}
if message.Document != nil {
s.processFileMessage(ctx, b, m, message.Document.FileID, memo)
}
if message.Voice != nil {
s.processFileMessage(ctx, b, m, message.Voice.FileID, memo)
}
if message.Video != nil {
s.processFileMessage(ctx, b, m, message.Video.FileID, memo)
}
if len(message.Photo) > 0 {
photo := message.Photo[len(message.Photo)-1]
s.processFileMessage(ctx, b, m, photo.FileID, memo)
}
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: fmt.Sprintf("Content saved with [%s](%s/m/%s)", memo.Name, s.config.ServerAddr, memo.Uid),
ParseMode: models.ParseModeMarkdown,
DisableNotification: true,
ReplyParameters: &models.ReplyParameters{
MessageID: message.ID,
},
})
}
func (s *Service) startHandler(ctx context.Context, b *bot.Bot, m *models.Update) {
userID := m.Message.From.ID
accessToken := strings.TrimPrefix(m.Message.Text, "/start ")
ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken)))
user, err := s.client.AuthService.GetAuthStatus(ctx, &v1pb.GetAuthStatusRequest{})
if err != nil {
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: "Invalid access token",
})
return
}
userAccessTokenCache.Store(userID, accessToken)
b.SendMessage(ctx, &bot.SendMessageParams{
ChatID: m.Message.Chat.ID,
Text: fmt.Sprintf("Hello %s!", user.Nickname),
})
}
func (s *Service) saveResourceFromFile(ctx context.Context, file *models.File, memo *v1pb.Memo) (*v1pb.Resource, error) {
fileLink := s.bot.FileDownloadLink(file)
response, err := http.Get(fileLink)
if err != nil {
return nil, errors.Wrap(err, "failed to download file")
}
defer response.Body.Close()
bytes, err := io.ReadAll(response.Body)
if err != nil {
return nil, errors.Wrap(err, "failed to read file")
}
contentType, err := getContentType(fileLink)
if err != nil {
return nil, errors.Wrap(err, "failed to get content type")
}
resource, err := s.client.ResourceService.CreateResource(ctx, &v1pb.CreateResourceRequest{
Resource: &v1pb.Resource{
Filename: filepath.Base(file.FilePath),
Type: contentType,
Size: file.FileSize,
Content: bytes,
Memo: &memo.Name,
},
})
if err != nil {
return nil, errors.Wrap(err, "failed to create resource")
}
return resource, nil
}
func (s *Service) processFileMessage(ctx context.Context, b *bot.Bot, m *models.Update, fileID string, memo *v1pb.Memo) {
file, err := b.GetFile(ctx, &bot.GetFileParams{FileID: fileID})
if err != nil {
s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to get file"))
return
}
_, err = s.saveResourceFromFile(ctx, file, memo)
if err != nil {
s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to save resource"))
return
}
}
func (s *Service) sendError(b *bot.Bot, chatID int64, err error) {
slog.Error("error", slog.Any("err", err))
b.SendMessage(context.Background(), &bot.SendMessageParams{
ChatID: chatID,
Text: fmt.Sprintf("Error: %s", err.Error()),
})
}