docs: add join concept #308

docs/onboarding-join-concept.md

@@ -0,0 +1,230 @@
+# Onboarding & Join – High-Level Concept
+
+**Status:** Draft for design decisions and implementation specs  
+**Scope:** Prio 1 = public Join form; Step 2 = Vorstand approval. Invite-Link and OIDC JIT are out of scope and documented only as future entry paths.  
+**Related:** Issue #308, roles-and-permissions-architecture, page-permission-route-coverage.
+
+---
+
+## 1. Focus and Goals
+
+- **Focus:** Onboarding and **initial data capture**, not self-service editing of existing members.
+- **Entry paths (vision):**
+  - **Public Join form** (Prio 1) – unauthenticated submission.
+  - **Invite link** (tokenized) – later.
+  - **OIDC first-login** (Just-in-Time Provisioning) – later.
+- **Admin control:** All entry paths and their behaviour (e.g. which fields, approval required) shall be configurable by admins; MVP can start with sensible defaults.
+- **Approval:** A Vorstand (board) approval step is a direct follow-up (Step 2) after the public Join; the data model and flow must support it.
+
+---
+
+## 2. Prio 1: Public Join Page
+
+### 2.1 Intent
+
+- **Public** page (e.g. `/join`): no login; anyone can open and submit.
+- Result is **not** a User or Member. Result is an **onboarding / join request**: the JoinRequest record is **created in the database on form submit** in status `pending_confirmation`, then **updated to** `submitted` after the user clicks the confirmation link.
+- This keeps:
+  - **Public intake** (abuse-prone) separate from **identity and account creation** (after approval / invite / OIDC).
+  - Existing policies (e.g. User–Member linking, admin-only link) untouched until a defined "promotion" flow (e.g. after approval) creates User/Member.
+- **Elixir/Phoenix/Ash standard:** Data is persisted in the database from the start (one Ash resource, status-driven flow). No ETS or stateless token for pre-confirmation storage; confirm flow only updates the existing record.
+
+### 2.2 User Flow (Prio 1)
+
+1. Unauthenticated user opens `/join`.
+2. Short explanation + form (what happens next: "We will review … you will hear from us").
+3. **Submit** → A **JoinRequest is created** in the database with status `pending_confirmation`; confirmation email is sent; user sees: "We have saved your details. To complete your request, please click the link we sent to your email."
+4. **User clicks confirmation link** → The existing JoinRequest is **updated** to status `submitted` (`submitted_at` set, confirmation token invalidated); user sees: "Thank you, we have received your request."
+
+**Rationale (double opt-in with DB-first):** Email confirmation remains best practice (we only treat the request as "submitted" after the link is clicked). The record exists in the DB from submit time so we use standard Phoenix/Ash persistence, multi-node safety, and a simple status transition (`pending_confirmation` → `submitted`) on confirm. This aligns with patterns like AshAuthentication (resource exists before confirm; confirm updates state).
+
+**Out of scope for Prio 1:** Approval UI, account creation, OIDC, invite links.
+
+### 2.3 Data Flow
+
+- **Input:** Only data explicitly allowed for the public form; field set is admin-configured (see §2.6). No internal or sensitive fields. **Server-side allowlist:** The set of accepted fields must be enforced on the server from the join-form settings (allowlist), not only in the UI, to prevent field injection or extra attributes from being stored.
+- **On form submit:** **Create** a JoinRequest with status `pending_confirmation`, store confirmation token **hash** in the DB (raw token only in the email link), set `confirmation_token_expires_at` (e.g. 24h), store all allowlisted form data (see §2.3.2), then send confirmation email.
+- **On confirmation link click:** **Update** the JoinRequest (find by token hash): set status to `submitted`, set `submitted_at`, clear/invalidate token fields. If the record is already `submitted`, return success without changing it (idempotent).
+- **No creation** of Member or User in Prio 1; promotion to Member/User happens in a later step (e.g. after approval).
+
+#### 2.3.1 Pre-Confirmation Store (Decided)
+
+**Decision:** Store in the **database** only. Use the **same** JoinRequest resource and table from the start.
+
+- On submit: **create** one JoinRequest row with status `pending_confirmation`, confirmation token **hash**, and expiry.
+- On confirm: **update** that row to status `submitted` (no second table, no ETS, no stateless token).
+- **Retention and cleanup:** JoinRequests that remain in `pending_confirmation` past the token expiry (e.g. 24 hours) are **hard-deleted** by a scheduled job (e.g. Oban cron). Retention period: **24 hours**; document in DSGVO/retention as needed.
+- **Rationale:** Elixir/Phoenix/Ash standard is persistence in DB, one resource, status machine. Multi-node safe, restart safe, and cleanup is a standard cron task.
+
+#### 2.3.2 JoinRequest: Data Model and Schema
+
+- **Status:** `pending_confirmation` (initial, after form submit) → `submitted` (after link click) → later `approved` / `rejected`. Include **approved_at**, **rejected_at**, **reviewed_by_user_id** for audit.
+- **Confirmation:** Store **confirmation_token_hash** (not the raw token); **confirmation_token_expires_at**; optional **confirmation_sent_at**. Raw token appears only in the email link; on confirm, hash the incoming token and find the record by hash.
+- **Payload vs typed columns (recommendation):**
+  - **Typed columns** for **email** (required, dedicated field for index, search, dedup, audit) and for **first_name** and **last_name** (optional). These align with `Mv.Constants.member_fields()` and with the existing Member resource; they support approval-list display and straightforward promotion to Member without parsing JSON.
+  - **Remaining form data** (other member fields + custom field values) in a **jsonb** attribute (e.g. `form_data`) plus a **schema_version** (e.g. tied to join-form or member_fields evolution) so future changes do not break existing records.
+  - **What it depends on:** (1) Whether the join form field set is fixed or often extended – if fixed, more typed columns are feasible; if very dynamic, keeping the rest in jsonb avoids migrations. (2) Whether the approval UI or reporting needs to filter/sort by other fields (e.g. city) – if yes, consider adding those as typed columns later. For MVP, email + first_name + last_name typed and rest in jsonb is a good balance with the current codebase (Member has typed attributes; export/import use allowlists of field names).
+- **Logger hygiene:** Do not log the full payload/form_data; follow CODE_GUIDELINES on log sanitization.
+- **Idempotency:** Confirm action finds the JoinRequest by token hash; if status is already `submitted`, return success without updating. Optionally enforce **unique_index on confirmation_token_hash** so the same token cannot apply to more than one record.
+- **Abuse metadata:** If stored (e.g. IP hash), classify as **security telemetry** or **personally identifiable** (DSGVO). Prefer hashed/aggregated values only (e.g. /24 prefix hash or keyed-hash), not raw IP; document classification and retention. Out of scope for Prio 1 unless explicitly added.
+
+### 2.4 Security
+
+- **Public paths:** `/join` and the confirmation route must be public (unauthenticated access returns 200).
+  - **Explicit public path for `/join`:** Add **`/join`** (and if needed `/join/*`) to the page-permission plug’s **`public_path?/1`** so that the join page is reachable without login. Do not rely on the confirm path alone.
+  - **Confirmation route:** Use **`/confirm_join/:token`** so that the existing whitelist (e.g. `String.starts_with?(path, "/confirm")`) already covers it; no extra plug change for confirm.
+- **Abuse:** **Honeypot** (MVP) plus **rate limiting** (MVP). Use Phoenix/Elixir standard options (e.g. **Hammer** with **Hammer.Plug**, ETS backend), scoped to the join flow (e.g. by IP). Verify library version and multi-node behaviour before or during implementation.
+- **Data:** Minimal PII; no sensitive data on the public form; consider DSGVO when extending. If abuse signals are stored: only hashed or aggregated values; document classification and retention.
+- **Approval-only:** No automatic User/Member creation from the join form; approval (Step 2) or other trusted path creates identity.
+- **Ash policies and actor:** JoinRequest has **explicit public actions** allowed with `actor: nil` (e.g. `submit` for create, `confirm` for update). Model via **policies** that permit these actions when actor is nil; do **not** use `authorize?: false` unless documented and clearly not a privilege-escalation path.
+- **No system-actor fallback:** Join and confirmation run without an authenticated user. Do **not** use the system actor as a fallback for "missing actor". Use explicit unauthenticated context; see CODE_GUIDELINES §5.0.
+
+### 2.5 Usability and UX
+
+- **After submit:** Communicate clearly: e.g. "We have saved your details. To complete your request, please click the link we sent to your email." (Exact copy in implementation spec.)
+- Clear heading and short copy (e.g. "Become a member / Submit request" and "What happens next").
+- Form only as simple as needed (conversion vs. data hunger).
+- Success message after confirm: neutral, no promise of an account ("We will get in touch").
+- **Expired confirmation link:** If the user clicks after the token has expired, show a clear message (e.g. "This link has expired") and instruct them to submit the form again. Specify exact copy and behaviour in the implementation spec.
+- **Re-send confirmation link:** Out of scope for Prio 1. If not implemented in Prio 1, **create a separate ticket immediately**. Example UX: "Request new confirmation email" on the "Please confirm your email" or expired-link page.
+- Accessibility and i18n: same standards as rest of the app (labels, errors, Gettext).
+
+### 2.6 Admin Configurability: Join Form Settings
+
+- **Placement:** Own section **"Onboarding / Join"** in global settings, **above** "Custom fields", **below** "Vereinsdaten" (club data).
+- **Join form enabled:** Checkbox (e.g. `join_form_enabled`). When set, the public `/join` page is active and the following config applies.
+- **Field selection:** From **all existing** member fields (from `Mv.Constants.member_fields()`) and **custom fields**, the admin selects which fields appear on the join form. Stored as a list/set of field identifiers (no separate table); display in settings as a simple list, e.g. **badges with X to remove** (similar to the groups overview). Adding fields: e.g. dropdown or modal to pick from remaining fields. Detailed UX for this subsection is to be specified in a **separate subtask**.
+- **Technically required fields:** The only field that must always be required for the join flow is **email**. All other fields can be optional or marked as required per admin choice; implementation should support a "required" flag per selected join-form field.
+- **Other:** Which entry paths are enabled, approval workflow (who can approve) – to be detailed in Step 2 and later specs.
+
+---
+
+## 3. Step 2: Vorstand Approval
+
+- **Goal:** Board (Vorstand) can review join requests (e.g. list status "submitted") and approve or reject.
+- **Outcome of approval (admin-configurable):**
+  - **Default:** Approval creates **Member only**; no User is created. An admin can link a User later if needed.
+  - **Optional (configurable):** If an option is set, approval may also create a **User** (e.g. invite-to-set-password). This is **open for later**; implementation concepts will be detailed when that option is implemented.
+- **Permissions:** Approval uses the existing permission set **normal_user** (e.g. role "Kassenwart"). JoinRequest gets read and update (or dedicated approve/reject actions) for scope :all in normal_user, and the approval page (e.g. `/join_requests` or `/onboarding/join_requests`) is added to normal_user’s allowed pages.
+
+---
+
+## 4. Future Entry Paths (Out of Scope Here)
+
+- **Invite link (tokenized):** Unique link per invitee; submission or account creation tied to token.
+- **OIDC first-login (JIT):** First login via OIDC creates/links User and optionally Member from IdP data.
+- Both must be design-ready so they can attach to the same approval or creation pipeline later.
+
+---
+
+## 5. Evaluation of the Proposed Concept Draft
+
+**Adopted and reflected above:**
+
+- **Naming:** Resource name **JoinRequest** (one resource, status + audit timestamps).
+- **No User/Member from `/join`:** Only a JoinRequest; record is **created on form submit** (status `pending_confirmation`) and **updated to** `submitted` on confirmation. Abuse surface and policy complexity stay low.
+- **Dedicated resource and actions:** New resource `JoinRequest` with public actions: **submit** (create with `pending_confirmation` + send email) and **confirm** (update to `submitted`). Member/User domain unchanged.
+- **Public paths:** `/join` is **explicitly** added to the page-permission plug’s public path list; confirmation route `/confirm_join/:token` is covered by existing `/confirm*` rule.
+- **Minimal data:** Email is technically required; other fields from admin-configured join-form field set, with optional "required" per field.
+- **Security:** Honeypot + rate limiting in MVP; email confirmation before treating request as submitted; token stored as hash; 24h retention and hard-delete for expired pending.
+- **Tests:** Unauthenticated GET `/join` → 200; submit creates one JoinRequest (`pending_confirmation`); confirm updates it to `submitted`; idempotent confirm; honeypot and rate limiting covered; public-path tests updated.
+
+**Refinements in this document:**
+
+- Approval as Step 2; User creation after approval left open for later.
+- Admin configurability: join form settings as own section; detailed UX in a subtask.
+- Three entry paths (public, invite, OIDC) and their place in the roadmap made explicit.
+- Pre-confirmation store: DB only, one resource, 24h retention, hard-delete.
+- Payload: typed email (required), first_name, last_name; rest in jsonb with schema_version; rationale and what it depends on documented.
+
+---
+
+## 6. Decisions and Open Points
+
+**Decided:**
+
+- **Email confirmation (double opt-in):** JoinRequest is **created on form submit** with status `pending_confirmation` and **updated to** `submitted` when the user clicks the confirmation link. Double opt-in is preserved (we only treat as "submitted" after the link is clicked). Existing confirmation pattern (AshAuthentication) is reused for token + email sender + route.
+- **Naming:** **JoinRequest**.
+- **Pre-confirmation store:** **DB only.** Same JoinRequest resource; no ETS, no stateless token. Confirmation token stored as **hash** in DB; raw token only in email link. **24h** retention for `pending_confirmation`; **hard-delete** of expired records via scheduled job (e.g. Oban cron).
+- **Confirmation route:** **`/confirm_join/:token`** so existing `starts_with?(path, "/confirm")` covers it.
+- **Public path for `/join`:** **Add `/join` explicitly** to the page-permission plug’s `public_path?/1` (e.g. in `CheckPagePermission`) so unauthenticated users can reach the join page.
+- **JoinRequest schema:** Status `pending_confirmation` | `submitted` | `approved` | `rejected`. Typed: **email** (required), **first_name**, **last_name** (optional). **form_data** (jsonb) + **schema_version** for remaining form fields. **confirmation_token_hash**, **confirmation_token_expires_at**; **submitted_at**, **approved_at**, **rejected_at**, **reviewed_by_user_id** for audit. Idempotent confirm (unique constraint on token hash or update only when status is `pending_confirmation`).
+- **Approval outcome:** Admin-configurable. Default: approval creates Member only (no User). Optional "create User on approval" is **left for later**.
+- **Rate limiting:** Honeypot + rate limiting from the start (e.g. Hammer.Plug).
+- **Settings:** Own section "Onboarding / Join" in global settings; `join_form_enabled` plus field selection; display as list/badges; detailed UX in a **separate subtask**.
+- **Approval permission:** normal_user; JoinRequest read/update and approval page added to normal_user; no new permission set.
+- **Resend confirmation:** If not in Prio 1, create a separate ticket immediately.
+
+**Open for later:**
+
+- Abuse metadata (IP hash etc.): classification and whether to store in Prio 1.
+- "Create User on approval" option: to be specified when implemented.
+- Invite link and OIDC JIT entry paths.
+
+---
+
+## 7. Definition of Done (Prio 1)
+
+- Public `/join` page and confirmation route reachable without login; **`/join` explicitly** in public paths (plug and tests).
+- Flow: form submit → **JoinRequest created** in status `pending_confirmation` → confirmation email sent → user clicks link → **JoinRequest updated** to status `submitted`; no User or Member created by this flow.
+- Anti-abuse: honeypot and rate limiting implemented and tested.
+- Cleanup: scheduled job hard-deletes JoinRequests in `pending_confirmation` older than 24h (or configured retention).
+- Page-permission and routing tests updated (including public-path coverage for `/join` and `/confirm_join/:token`).
+- Concept and decisions (§6) documented for use in implementation specs.
+
+---
+
+## 8. Implementation Plan (Subtasks)
+
+**Resend confirmation** remains a separate ticket (see §2.5, §6).
+
+### Prio 1 – Public Join (4 subtasks)
+
+#### 1. JoinRequest resource and public policies
+
+- **Scope:** Ash resource `JoinRequest` per §2.3.2: status (`pending_confirmation`, `submitted`, `approved`, `rejected`), email (required), first_name, last_name (optional), form_data (jsonb), schema_version; confirmation_token_hash, confirmation_token_expires_at; submitted_at, approved_at, rejected_at, reviewed_by_user_id, source. Migration; unique_index on confirmation_token_hash (or equivalent for idempotency).
+- **Policies:** Public actions **submit** (create) and **confirm** (update) allowed with `actor: nil`; no system-actor fallback, no undocumented `authorize?: false`.
+- **Boundary:** No UI, no emails – only resource, persistence, and actions callable with nil actor.
+- **Done:** Resource and migration in place; tests for create/update with `actor: nil` and for idempotent confirm (same token twice → no second update).
+
+#### 2. Submit and confirm flow
+
+- **Scope:** Form submit → **create** JoinRequest (status `pending_confirmation`, token hash + expiry, form data) → send confirmation email (reuse AshAuthentication sender pattern). Route **`/confirm_join/:token`** → verify token (hash and lookup) → **update** JoinRequest to status `submitted`, set submitted_at, invalidate token (idempotent if already submitted). Optional: Oban (or similar) job to **hard-delete** JoinRequests in `pending_confirmation` with confirmation_token_expires_at older than 24h.
+- **Boundary:** No join-form UI, no admin settings – only backend create/update and email/route.
+- **Done:** Submit creates one JoinRequest; confirm updates it to submitted; double-click idempotent; expired token shows clear message; cleanup job implemented and documented. Tests for these cases.
+
+#### 3. Admin: Join form settings
+
+- **Scope:** Section "Onboarding / Join" in global settings (§2.6): `join_form_enabled`, selection of join-form fields (from member_fields + custom fields), "required" per field. Persist (e.g. Setting or existing config). UI e.g. badges with remove + dropdown/modal to add (details in sub-subtask if needed).
+- **Boundary:** No public form – only save/load of config and **server-side allowlist** for use in subtask 4.
+- **Done:** Settings save/load; allowlist available in backend for join form; tests.
+
+#### 4. Public join page and anti-abuse
+
+- **Scope:** Route **`/join`** (public). **Add `/join` to the page-permission plug’s public path list** so unauthenticated access is allowed. LiveView (or controller + form). Form fields from allowlist (subtask 3); copy per §2.5. **Honeypot** and **rate limiting** (e.g. Hammer.Plug) on join/submit. After submit: show "We have saved your details … click the link …". Expired-link page: clear message + "submit form again". Public-path tests updated to include `/join`.
+- **Boundary:** No approval UI, no User/Member creation – only public page, form, anti-abuse, and wiring to submit/confirm flow (subtask 2).
+- **Done:** Unauthenticated GET `/join` → 200; submit creates JoinRequest (pending_confirmation) and sends email; confirm updates to submitted; honeypot and rate limit tested; public-path tests updated.
+
+### Order and dependencies
+
+- **1 → 2:** Submit/confirm flow uses JoinRequest resource.
+- **3 before or in parallel with 4:** Form reads allowlist from settings; for MVP, subtask 4 can use a default allowlist and 3 can follow shortly after.
+- **Recommended order:** **1** → **2** → **3** → **4** (or 3 in parallel with 2 if two people work on it).
+
+### Step 2 – Approval (1 subtask, later)
+
+#### 5. Approval UI (Vorstand)
+
+- **Scope:** List JoinRequests (status "submitted"), approve/reject actions; on approve create Member (no User in MVP). Permission: normal_user; add page to PermissionSets. Populate audit fields (approved_at, rejected_at, reviewed_by_user_id).
+- **Boundary:** Separate ticket; builds on JoinRequest and existing Member creation.
+
+---
+
+## 9. References
+
+- `docs/roles-and-permissions-architecture.md` – Permission sets, roles, page permissions.
+- `docs/page-permission-route-coverage.md` – Public paths, plug behaviour, tests.
+- `lib/mv_web/plugs/check_page_permission.ex` – Public path list; **add `/join`** in `public_path?/1`.
+- `lib/mv/accounts/user/senders/send_new_user_confirmation_email.ex` – Existing confirmation-email pattern (token, link, Mailer).
+- Hammer / Hammer.Plug (e.g. hexdocs.pm/hammer) – Rate limiting for Phoenix/Plug.
+- Issue #308 – Original feature/planning context.

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