Plugin architecture (#4861)

* wip

* Refactor, tasks, processors, routes loading

* Move Slack settings config to plugin

* Fix translations in plugins

* Move Slack auth to plugin

* test

* Move other slack-related files into plugin

* Forgot to save

* refactor

plugins/slack/server/presenters/messageAttachment.ts

@@ -0,0 +1,38 @@
+import { traceFunction } from "@server/logging/tracing";
+import { Document, Collection, Team } from "@server/models";
+
+type Action = {
+  type: string;
+  text: string;
+  name: string;
+  value: string;
+};
+
+function presentMessageAttachment(
+  document: Document,
+  team: Team,
+  collection?: Collection | null,
+  context?: string,
+  actions?: Action[]
+) {
+  // the context contains <b> tags around search terms, we convert them here
+  // to the markdown format that slack expects to receive.
+  const text = context
+    ? context.replace(/<\/?b>/g, "*").replace(/\n/g, "")
+    : document.getSummary();
+
+  return {
+    color: collection?.color,
+    title: document.title,
+    title_link: `${team.url}${document.url}`,
+    footer: collection?.name,
+    callback_id: document.id,
+    text,
+    ts: document.getTimestamp(),
+    actions,
+  };
+}
+
+export default traceFunction({
+  spanName: "presenters",
+})(presentMessageAttachment);