Reddit setup

Synced from docs/reddit-setup.md @ 2222d0c. Edit there, not here.

Reddit setup (#1492)

Candela reads Reddit through Reddit's official OAuth JSON API, not the .rss feeds. Reddit returns an instant HTTP 429 to Candela's honest User-Agent on .rss (verified 2026-07-02, #1489) — a deliberate policy pushing clients onto the API — and even when a feed loads, its items are truncated stubs. The API returns full post bodies and is sanctioned to ≈100 requests/minute per client id.

Reddit is BYOK (bring-your-own-key): you create your own free Reddit installed app and paste its client id into Candela. An installed app has a client id and no client secret, so Candela ships no secret of any kind — the cleanest possible posture for a distributed app. The token Candela mints is userless and read-only: it can read public subreddits and posts, and can do nothing to your account.

Status (v1): shipped end to end. Enable Reddit in Settings → Library & Sync → Plugin Manager → Reddit, then paste your client id in the Reddit card under Settings → Library & Sync (client-id field + "append top comments" toggle). Until a client id is entered the source is inert (every call returns "sign-in required"). A generic BYOK-config-field seam (so credentialed sources don't each hand-write a settings row) is tracked separately in #1531.

---

1 · Create a Reddit "installed app"

You need a free Reddit account. Then:

1. Go to https://www.reddit.com/prefs/apps (Settings → (you're at the bottom) → Apps, or the direct URL).
2. Click "Create App" / "Create Another App" at the bottom.
3. Fill in:

Field	Value
name	Candela (anything you like — only you see it)
type	installed app — this is the important one. It creates a public client with a client id and no secret. (Not "web app" or "script".)
description	optional
about url	optional
redirect uri	http://localhost — required by the form, but unused: Candela's userless grant never redirects. Any valid URL is fine.

4. Click "Create app".

---

2 · Copy your client id

After creating the app, Reddit shows a card. The client id is the short string directly under the app name (under the words "installed app") — it looks like AbC1dEf2GhI3jK. There is no secret for an installed app, so that's the only value you need.

Paste that client id into Candela: Settings → Library & Sync → Reddit → Client id → Save. That's it — Candela mints a read-only token in the background and Reddit browsing lights up. (Enable the Reddit plugin first in the same section's Plugin Manager if you haven't.)

---

3 · How Candela reads Reddit

• A subreddit is a "book." r/nosleep, r/books, r/WritingPrompts — each becomes a fiction in your library.
• A post is a "chapter." Its full self-text is the chapter body (never a stub). Link/image posts degrade gracefully to a short "this is a link post" note.
• Top comments (optional). Turn on "Append top comments" and the top N comments narrate as an epilogue after each post — great for discussion threads. Default is off.
• Which posts? A subreddit's chapters are its hot posts (this realises the issue's "popular = hot posts" idea). The sort (hot / new / top) is a per-source preference with a sensible hot default; a UI knob to change it is a follow-up.

Discovery

Browse action	What you get
Search	subreddits matching your query (/subreddits/search)
Popular	trending subreddits (/subreddits/popular)
Latest	newest subreddits (/subreddits/new)
Genres	a curated set of reading-friendly subreddits (books, nosleep, WritingPrompts, …)

Discovery lists surface the first ~25 subreddits, and a subreddit's chapter list is capped at its first 100 posts (Reddit paginates by cursor, not page number — deeper paging is a follow-up). Genres shows a curated default set today; deriving it from your subscribed subreddits needs a full user sign-in (the userless grant can't do that) — a follow-up, as is a UI to edit a personal favourites list.

---

⚠️ Security & privacy note

• No secret ships. An installed-app client id is a public identifier, not a credential — there is nothing secret in the APK. (It is still stored encrypted in storyvox.secrets, for parity with other source logins.)
• Read-only, userless. The installed_client grant produces a token scoped to public reads only. Candela cannot post, vote, or see your private data with it.
• Honest User-Agent. Every request carries Candela's descriptive UA (#1204). No browser-UA spoofing — the descriptive UA is the whole reason the API path exists (RSS blocks it; the API welcomes it).
• Your quota is yours. Rate limits attribute to your client id (≈100 QPM). A stable per-install device id keeps that attribution clean.

---

How it works (for the curious)

1. Candela POSTs to https://www.reddit.com/api/v1/access_token with HTTP Basic auth (<client id>: — empty password) and grant_type=https://oauth.reddit.com/grants/installed_client&device_id=<uuid>.
2. Reddit returns a bearer token (~1 hour TTL, read-only). Candela caches it in memory and renews it a minute before expiry.
3. Every read hits https://oauth.reddit.com/... with Authorization: bearer <token> — subreddit search / popular / new, /r/<sub>/{hot,new,top} for a subreddit's posts, and /r/<sub>/comments/<id> for a post's full body + comments.

Only the client id + a generated device id are persisted; the bearer token is never written to disk (it's cheap to re-mint and expires hourly).