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botapi: implement getChat

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Adds the getChat method to the HTTP Bot API gateway. Numeric chat_id only (no
@username). Resolution goes through the shared peer resolvers:

- user: ByID; unknown -> CHAT_NOT_FOUND
- channel/supergroup: ResolveChannel, so a public one resolves even when the bot
  is not a member (projected as a preview); a private one the bot cannot access
  -> CHAT_NOT_FOUND, a banned bot likewise

The Chat projection returns id (bot-api encoded), type ("channel" for a
broadcast, "supergroup" for a megagroup, "private" for a user), title, username,
first/last name, description, is_forum, and the scam/fake/verified flags.
This commit is contained in:
Astra 2026-09-09 16:14:49 +01:00
parent 78267ee0d3
commit d022521d67
5 changed files with 221 additions and 0 deletions
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28
internal/botapi/server.go
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@ -41,6 +41,7 @@ type WebAppService interface {
type GatewayService interface {
BotAPISelf(ctx context.Context, botID int64) (domain.User, error)
BotAPIChat(ctx context.Context, botID, chatID int64) (domain.BotAPIChat, error)
BotAPIUpdates(ctx context.Context, botID int64, offset int64) ([]domain.UpdateEvent, error)
BotAPISendMessage(ctx context.Context, botID, chatID int64, text string, entities []domain.MessageEntity, replyMarkup *domain.MessageReplyMarkup, disableWebPagePreview, silent bool, replyToMessageID int) (domain.Message, error)
BotAPISendRichMessage(ctx context.Context, botID, chatID int64, rich domain.BotAPIRichMessageInput, replyMarkup *domain.MessageReplyMarkup, silent, noForwards bool, replyToMessageID int, effectID int64) (domain.Message, error)
@ -197,6 +198,8 @@ func (h *handler) handle(w http.ResponseWriter, r *http.Request) {
switch strings.ToLower(method) {
case "getme":
h.getMe(w, r, botID)
case "getchat":
h.getChat(w, r, botID)
case "setmycommands":
h.setMyCommands(w, r, botID)
case "deletemycommands":
@ -310,6 +313,30 @@ func (h *handler) getMe(w http.ResponseWriter, r *http.Request, botID int64) {
writeAPIOK(w, apiUser(u))
}
func (h *handler) getChat(w http.ResponseWriter, r *http.Request, botID int64) {
if h.gateway == nil {
writeAPIError(w, http.StatusNotImplemented, "METHOD_NOT_FOUND")
return
}
values, err := requestValues(r)
if err != nil {
writeAPIError(w, http.StatusBadRequest, "BAD_REQUEST")
return
}
// Numeric chat_id only - no @username resolution.
chatID, err := strconv.ParseInt(strings.TrimSpace(values["chat_id"]), 10, 64)
if err != nil || chatID == 0 {
writeAPIError(w, http.StatusBadRequest, "CHAT_ID_INVALID")
return
}
chat, err := h.gateway.BotAPIChat(r.Context(), botID, chatID)
if err != nil {
writeAPIError(w, http.StatusBadRequest, apiErrorDescription(err))
return
}
writeAPIOK(w, apiChatFull(chat))
}
func (h *handler) getUpdates(w http.ResponseWriter, r *http.Request, botID int64) {
if h.gateway == nil {
writeAPIError(w, http.StatusNotImplemented, "METHOD_NOT_FOUND")
@ -1457,6 +1484,7 @@ func apiErrorDescription(err error) string {
"BUTTON_URL_INVALID",
"BOT_INVALID",
"CHAT_ID_INVALID",
"CHAT_NOT_FOUND",
"ENTITY_INVALID",
"ENTITIES_TOO_LONG",
"ENTITY_BOUNDS_INVALID",