Hide posts tool (#2299)

* Set up hidden posts persisted state

* Wrap moderatePost

* Integrate hidden posts into moderation

* Complete hide-post behaviors

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/lib/moderatePost_wrapped.ts

@@ -0,0 +1,29 @@
+import {moderatePost} from '@atproto/api'
+
+type ModeratePost = typeof moderatePost
+type Options = Parameters<ModeratePost>[1] & {
+  hiddenPosts?: string[]
+}
+
+export function moderatePost_wrapped(
+  subject: Parameters<ModeratePost>[0],
+  opts: Options,
+) {
+  const {hiddenPosts = [], ...options} = opts
+  const moderations = moderatePost(subject, options)
+
+  if (hiddenPosts.includes(subject.uri)) {
+    moderations.content.filter = true
+    moderations.content.blur = true
+    if (!moderations.content.cause) {
+      moderations.content.cause = {
+        // @ts-ignore Temporary extension to the moderation system -prf
+        type: 'post-hidden',
+        source: {type: 'user'},
+        priority: 1,
+      }
+    }
+  }
+
+  return moderations
+}