import { htmlToText as coreHtmlToText } from "../../core/html-to-text.ts";
import type { DeliveryResult, MailAdapter, OwnerRef, ParsedMail } from "../../core/types.ts";
import { postMessage, uploadFile, SlackApiError, type SlackFile } from "./slack-rest.ts";
// Conservative caps, not Slack's actual platform maximums -- chosen the
// same way Discord's and Telegram's adapters picked theirs: a point past
// which a message stops being a quick DM to skim and should be an
// attachment instead.
const INLINE_BODY_CAP = 3500;
const SLACK_FILE_CAP = 50 * 1024 * 1024;
const MAX_HTML_LENGTH = 256 * 1024;
const SPARSE_TEXT_THRESHOLD = 200;
const SUBSTANTIAL_HTML_THRESHOLD = 1500;
function htmlToText(html: string): string {
return coreHtmlToText(html, {
// mrkdwn has its own small set of special characters (*_~`), but
// escaping them would mangle legitimate-looking formatting in
// forwarded mail worse than just leaving it plain -- same tradeoff
// Telegram's plain-text send makes, just for a different syntax.
escape: (text) => text,
formatLink: (url) => `(${url})`,
});
}
function truncateAtLineBoundary(text: string, maxLength: number): string {
const lines = text.split("\n");
let result = "";
for (const line of lines) {
const candidate = result ? `${result}\n${line}` : line;
if (candidate.length > maxLength) {
break;
}
result = candidate;
}
return result || text.slice(0, maxLength);
}
export function createSlackAdapter(botToken: string): MailAdapter {