# Relicario — Standalone Vault Initialization Wizard Design

A browser-based wizard that guides new users through creating a Relicario vault from scratch. Lives at `extension/setup.html`, uses the same WASM module as the extension, same terminal dark aesthetic. No server, no Rust toolchain required.

## Scope

- Single HTML page with inline JS (bundled by webpack) at `extension/setup.html`
- 4-step wizard: choose host → configure connection → create vault → finish
- Pushes vault files directly to Gitea/GitHub via API
- Downloads reference image to user's machine
- Optionally pushes config to the Chrome extension if installed

## Flow

### Step 1: Choose Git Host

Toggle between Gitea and GitHub. Below the toggle, show inline setup instructions:

**Gitea instructions:**
1. Log in to your Gitea instance
2. Create a new empty repository (no README, no .gitignore)
3. Go to Settings → Applications → Generate New Token
4. Select scope: `repo` (read/write)
5. Copy the token

**GitHub instructions:**
1. Go to github.com → New Repository
2. Create an empty repository (no README, no .gitignore, no license)
3. Go to Settings → Developer Settings → Personal Access Tokens → Fine-grained tokens
4. Generate new token, select only the target repository
5. Permissions: Contents → Read and write
6. Copy the token

Step includes a "Next" button. No validation needed at this step.

### Step 2: Configure Connection

Fields:
- Host URL (e.g. `https://git.adlee.work` or `https://github.com`) — pre-filled based on host type selection
- Repository path (e.g. `alee/relicario-vault`)
- API token (password field)

"Test Connection" button:
- Hits the git API to verify the token works and the repo exists
- Checks that the repo is empty (no files) or contains only a README
- Shows green checkmark on success, red error on failure
- Must pass before "Next" is enabled

Uses the same `GitHost` interface (GiteaHost/GitHubHost) from the extension's service worker code.

### Step 3: Create Vault

Two inputs:
- **Carrier image:** File picker for a JPEG. Shows preview thumbnail after selection. Minimum size guidance ("use a photo from your phone — at least 400x300").
- **Passphrase:** Password field with confirmation. Minimum 8 characters enforced. Shows basic strength indicator (weak/ok/strong based on length + character variety).

"Create Vault" button triggers:

1. Load WASM module
2. Generate random 32-byte `image_secret` via `crypto.getRandomValues()`
3. Embed secret into carrier JPEG via WASM `extract_image_secret` — wait, that's extract. We need `embed`. Check: the WASM crate currently only exposes `extract_image_secret`, not `embed`. **We need to add a `embed_image_secret` function to `relicario-wasm`.**
4. Generate random 32-byte `salt` via `crypto.getRandomValues()`
5. Create `params.json` with default KDF params (`{"argon2_m":65536,"argon2_t":3,"argon2_p":4}`)
6. Derive `master_key` via WASM `derive_master_key(passphrase, image_secret, salt, params_json)`
7. Encrypt empty manifest (`{"entries":{},"version":1}`) via WASM `encrypt_manifest`
8. Push files to repo via git API:
   - `.relicario/salt` (raw 32 bytes)
   - `.relicario/params.json` (JSON string)
   - `.relicario/devices.json` (`[]`)
   - `manifest.enc` (encrypted manifest bytes)
9. Show progress bar during push operations

Spinner/progress during the Argon2id derivation (~1-2 seconds) and API calls.

### Step 4: Finish

Two things happen:

**Download reference image:**
- Browser downloads the steganographic JPEG as `reference.jpg`
- Show warning: "Keep this image safe. You need it alongside your passphrase to unlock the vault. Store it somewhere you won't lose it."

**Push config to extension (if available):**
- Try to detect the Relicario extension via `chrome.runtime.sendMessage` with a `get_setup_state` message
- If extension responds: push `save_setup` message with `{ config: { hostType, hostUrl, repoPath, apiToken }, imageBase64 }`. Show "Extension configured! You can now open the extension and unlock your vault."
- If extension not detected: show the config as a copyable JSON blob with instructions: "Install the Relicario extension, then paste this into the setup wizard." (Or just tell them to run through the extension setup manually with the same host/token/repo.)

## WASM Crate Change

The `relicario-wasm` crate needs one new function:

```rust
#[wasm_bindgen]
pub fn embed_image_secret(carrier_jpeg: &[u8], secret: &[u8]) -> Result<Vec<u8>, JsValue>
```

This wraps `relicario_core::imgsecret::embed`. Currently only `extract_image_secret` is exposed.

## File Structure

```
extension/
├── setup.html              # standalone wizard page
├── src/
│   └── setup/
│       └── setup.ts        # wizard logic (4-step state machine)
├── webpack.config.js        # add 'setup' entry point
```

The setup page reuses:
- `extension/wasm/` — same WASM module
- `extension/src/service-worker/git-host.ts`, `gitea.ts`, `github.ts` — git API layer
- `extension/src/popup/styles.css` — terminal dark theme (imported or linked)
- `extension/src/shared/types.ts` — VaultConfig type

## UI Design

Same terminal dark aesthetic as the popup but in a full-page layout (not 360px constrained). Centered content area, max-width ~600px. Same color scheme (#0d1117 bg, #58a6ff blue, monospace font).

Progress bar at top showing step 1-4. Each step is a full-page view with back/next navigation.

## Extension Detection

```typescript
// Try to send a message to the extension
function detectExtension(): Promise<boolean> {
  return new Promise((resolve) => {
    try {
      chrome.runtime.sendMessage(
        { type: 'get_setup_state' },
        (response) => {
          if (chrome.runtime.lastError || !response) {
            resolve(false);
          } else {
            resolve(true);
          }
        }
      );
    } catch {
      resolve(false);
    }
  });
}
```

Note: this only works if `setup.html` is served from the extension itself (`chrome-extension://<id>/setup.html`) or if we use `externally_connectable` in the manifest. For a local file, extension detection won't work — fall back to manual config copy.

If we add `setup.html` to the extension's web_accessible_resources and the user opens it via `chrome-extension://` URL, messaging works natively.

## manifest.json Changes

Add `setup.html` to the extension so it can be opened as a chrome-extension page:

```json
{
  "web_accessible_resources": [{
    "resources": ["setup.html", "setup.js", "styles.css", "relicario_wasm_bg.wasm", "relicario_wasm.js"],
    "matches": ["<all_urls>"]
  }]
}
```

The setup page can then be opened at `chrome-extension://<extension-id>/setup.html`. The extension popup can link to it, or the user can navigate directly.

## Security

- Passphrase never leaves the browser
- image_secret generated client-side, embedded client-side, never transmitted
- master_key derived and used in-browser only, then discarded
- API token used only for pushing vault files and optionally passed to extension storage
- The reference image download is the only artifact the user needs to keep safe

## Non-Goals

- Creating repos via API (user creates the repo manually — API permissions for repo creation vary widely)
- Git operations beyond file CRUD (no commits history, no branches)
- Password strength estimation beyond basic length/variety checks
- Mobile support (desktop Chrome only for now)