104 lines
5.4 KiB
Markdown
104 lines
5.4 KiB
Markdown
# Shared storage and Mastodon OAuth
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Personal Workspace runs as a single personal server behind Tailscale Serve. The
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backend binds to loopback. The configured Tailscale identity is an outer access
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check; a separate [owner login](login.md) is required in every deployment mode.
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Browser requests that change state must have the configured Origin. OAuth
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callbacks also pass the owner check; the browser must be able to reach the
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tailnet HTTPS address after Mastodon authorization.
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## Runtime configuration
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| Variable | Value |
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| ---------------------------------- | --------------------------------------------------------- |
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| `TWITTER_LITE_ORIGIN` | Exact Serve HTTPS origin, without a trailing slash |
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| `TWITTER_LITE_ALLOWED_LOGIN` | Owner's Tailscale login |
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| `TWITTER_LITE_DB_PATH` | Absolute path to the SQLite database on local disk |
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| `TWITTER_LITE_MASTODON_ORIGINS` | Comma-separated approved HTTPS instance origins |
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| `TWITTER_LITE_CREDENTIAL_KEY_FILE` | Runtime file containing 32 random bytes encoded as base64 |
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The credential key is required for Mastodon, but not for Twitter-only use.
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Generate it once, keep it outside Git and the Nix store, and retain it when
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updating the application. For example, with an existing private directory:
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```sh
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umask 077
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nix develop -c node --input-type=module -e 'import {randomBytes} from "node:crypto"; import {writeFileSync} from "node:fs"; writeFileSync("/absolute/private/credential-key", randomBytes(32).toString("base64") + "\n", {flag: "wx", mode: 0o600})'
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```
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The command refuses to replace an existing file. Losing the key makes saved
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SNS credentials unreadable. A separate protected backup of the key is needed
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alongside database backups.
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## Database and migrations
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Drizzle ORM 0.45.3, Drizzle Kit 0.31.11 and better-sqlite3 13.0.3 are pinned.
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The driver ships native prebuilds; dependency install scripts remain disabled.
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Both the actual Nix Node runtime and the built Nix package have been exercised
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with SQLite operations and the packaged backup command.
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`drizzle/` contains generated SQL and metadata. `pnpm db:generate` generates
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SQL and bundles it into TypeScript for the server. Commit both artifacts with
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schema changes. The server applies pending migrations under an immediate
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transaction before serving an authorized application request. It enables WAL,
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foreign keys and a five-second busy timeout. Deployment does not depend on a
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particular working directory or a separate migration command.
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Deck definitions, ordered columns, connection metadata, OAuth applications
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and short-lived OAuth attempts live in SQLite. Tokens, client secrets and
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PKCE verifiers are authenticated encrypted envelopes in separate fields.
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Their associated data binds each secret to its record and purpose. Public
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connection responses never select those fields.
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## Backups and restore
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Use the live SQLite backup API instead of copying only the main file while WAL
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is active. The destination must be an absolute path that does not already
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exist; backups are mode 0600 and pass a SQLite integrity check.
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```sh
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TWITTER_LITE_DB_PATH=/absolute/workspace.sqlite \
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nix develop -c pnpm db:backup /absolute/backups/workspace-2026-09-24.sqlite
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```
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The Nix package exposes the same operation as `twitter-lite-backup`:
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```sh
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TWITTER_LITE_DB_PATH=/var/lib/twitter-lite/workspace.sqlite \
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twitter-lite-backup /absolute/backups/workspace-2026-09-24.sqlite
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```
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Run it as an identity that can read the database and write the backup directory.
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On NixOS the application uses `DynamicUser`, `StateDirectory=twitter-lite` and
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mode 0700. The runtime key is passed with systemd `LoadCredential`.
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For restore, stop the service first. Preserve the current state directory as
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a separate recovery copy, then restore the verified backup as
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`workspace.sqlite` in a clean state directory with the service's ownership and
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permissions. Do not leave old `-wal` or `-shm` sidecars beside a restored main
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database. Restore the matching credential key separately, then start the
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service and verify decks and account access. Do not attempt to restore a newer
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schema into an older application version.
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## OAuth and instance support
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Initial support targets Mastodon 4.3+ with PKCE S256. The first configured
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instance, `https://fedi.yutakobayashi.com`, reported 4.5.3 and S256 on 2026-09-24.
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Only configured HTTPS origins with public DNS addresses are accepted; server
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requests pin the resolved address and refuse redirects.
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Each instance/callback/scope combination has an OAuth application. Authorization
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uses `read:accounts read:statuses read:lists read:search`, PKCE, a ten-minute
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one-use state and an HttpOnly browser-binding cookie. Tokens are exchanged and
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account identity is verified on the server. The callback URL never contains an
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access token. Same-instance accounts remain separate; reconnecting preserves
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the connection ID only for the same account.
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An expired token marks its connection unavailable until reconnected. Disconnect
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first revokes the token using the original OAuth application, then removes the
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local credential while retaining the connection reference used by saved decks.
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Search results depend on the instance's backend and indexing. A successful
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empty response does not prove full-text search is enabled: Mastodon 4.5.3 also
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returns empty status results when its search backend is disabled.
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