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fix: render permission state notices on template-switching page and authorize switch_template AJAX#1108

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fix: render permission state notices on template-switching page and authorize switch_template AJAX#1108
superdav42 wants to merge 3 commits intomainfrom
fix/empty-template-switch-page

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@superdav42 superdav42 commented May 5, 2026

Summary

Closes a customer-facing UX defect on the Sites > Switch Template page (the customer-panel page registered by Template_Switching_Admin_Page) and a privilege-escalation defect in the underlying is_customer_allowed() ownership check that the page relies on. Discovered while end-to-end verifying #1101 (AJAX hang) and #1103 (reset feature) on a clean 2.9.3 install.

The page used to render with three empty meta-box columns and no explanation whenever the customer's site had no linked membership, when the user was not the site's customer, or when a third-party hook disabled the widget. End users were left staring at a blank "Switch Template" header. While digging into the why, I found that is_customer_allowed() returned true whenever both the requesting customer id and the stored customer id were 0 — a classic zero-vs-zero comparison loophole that, combined with the install-wide wu-ajax-nonce, gave any subscriber-level account the ability to trigger wu_switch_template against orphan customer-owned sites.

Changes

Security — inc/models/class-site.php, inc/models/class-membership.php

  • is_customer_allowed() now defaults to denied when either side of the comparison is unknown (zero/empty/null). Network admins still bypass via the existing manage_network short-circuit at the top of each method, so legitimate admin flows are unaffected.

Authorization — inc/ui/class-template-switching-element.php

  • switch_template() (the wu_ajax_wu_switch_template handler) now calls is_customer_allowed() before reaching Site_Duplicator::override_site(). Returns a not_authorized WP_Error so the front-end JS can surface the reason instead of hanging on its loading spinner. The wu-ajax-nonce is shared across all logged-in users on the install, so this handler-level check is defense-in-depth even with the model fix in place.

UX — inc/ui/class-template-switching-element.php

  • setup() now sets a three-state permission_state (STATE_OK, STATE_NO_MEMBERSHIP, STATE_NOT_ALLOWED) instead of calling set_display(false) to silently disable the element.
  • output() always renders something useful:
    • STATE_OK → full template grid (existing behaviour).
    • STATE_NO_MEMBERSHIP → grid with an info banner explaining that plan-specific template restrictions don't apply, and a fallback to the full registered-template list (the same set defaults() builds via wu_get_site_templates()) so the grid is not empty.
    • STATE_NOT_ALLOWED → friendly denial notice asking the user to contact their network administrator.

Defense-in-depth — inc/admin-pages/customer-panel/class-template-switching-admin-page.php

  • register_widgets() wraps the wu_dash_before_metaboxes action in an ob_start/ob_get_clean buffer. If every widget on the page bails silently (e.g. a third-party filter disables Template_Switching_Element, or a future regression in Simple_Text_Element), the page emits a fallback notice instead of an empty body.

Tests

  • tests/WP_Ultimo/Models/Site_Test.php — adds test_is_customer_allowed_zero_versus_zero_denied and test_is_customer_allowed_known_customer_versus_unlinked_site_denied regression guards.
  • tests/WP_Ultimo/UI/Template_Switching_Element_Test.php — adds test_switch_template_rejects_unauthorized_caller covering the new AJAX gate. Updates the existing test_switch_template_missing_template_id_emits_json_error to call grant_super_admin() so it still reaches the template-id branch it was originally written to exercise.

Verification

End-to-end browser verification on a clean 2.9.3 install with kpcust1 (customer 1, site 6 = kpcust1.wordpress.local:8080).

Fixture state Expected UI Verified
wu_customer_id=1, wu_membership_id=1 Full Pink/Blue/Template Site grid + Reset button (existing behaviour) OK
wu_customer_id missing (orphan site) Yellow "Template switching is not available right now" denial notice OK
wu_customer_id=1, wu_membership_id missing Blue "site is not currently linked to a membership" banner + full grid + Reset OK

Test suite (run from a recovered worktree on this branch):

  • vendor/bin/phpunit --group ajax --no-coverageOK (49 tests, 94 assertions)
  • vendor/bin/phpunit --filter Template_Switching_Element_Test --no-coverageOK (3 tests, 15 assertions)
  • vendor/bin/phpunit tests/WP_Ultimo/Models/Site_Test.php --no-coverage89 tests, 238 assertions, 3 failures — all 3 failures are pre-existing baseline failures (test_site_validation_rules, test_domain_path_handling, test_url_generation) unrelated to this PR.
  • vendor/bin/phpstan analyse on the four touched source files → OK, no errors.

Why this matters

The empty-page bug looks cosmetic but it actually shipped silently for the lifetime of the customer-panel UI: any customer with an unlinked site, any customer pointed at a sibling's URL, and any future regression in Simple_Text_Element would all surface as "the page is broken" with no actionable signal. Wiring the rendering through an explicit state machine plus the page-level fallback means the page is now self-diagnostic — if the user sees nothing, the user sees a notice explaining why.

The security finding is a direct consequence of the empty-page investigation: the rendering bug masked a privilege-escalation surface that would have been hard to spot without an end-to-end repro. Fixing both together keeps the model-level guard, the handler-level guard, and the UI-level guard aligned around the same authorization concept.


Summary by CodeRabbit

  • Bug Fixes

    • Improved access control for memberships and sites to deny access when accounts are unlinked.
    • Enforced server-side authorization for template switching to prevent unauthorized changes.
  • New Features

    • Visible admin notice when template-switching widgets are unavailable.
    • Explicit permission states and user-facing notices for template switching.
    • Preserve default template options when membership-based list is empty; improved checkout template step handling.
  • Tests

    • Expanded tests covering site authorization and template-switching authorization scenarios.

superdav42 added 2 commits May 5, 2026 11:22
Site::is_customer_allowed() and Membership::is_customer_allowed() compared
the requesting customer id to the stored customer id with strict equality.
When both sides were 0 — for example, an orphan customer_owned site whose
wu_customer_id meta was missing, queried by a logged-in user with no UM
customer association — the comparison returned true and the caller was
treated as the legitimate owner.

Combined with the wu-ajax-nonce being shared across all logged-in users
on the install, this gave any subscriber-level account the ability to
trigger ownership-gated actions on unlinked sites. The customer-panel
template-switching UI rendered for them as if they owned the site, and
hooks like switch_template, site-actions, and current-site followed the
same defensive bail pattern that this guard ostensibly enforced.

Default to denied when either side is unknown (zero/empty/null). Network
admins still bypass via the manage_network short-circuit at the top of
each method, so legitimate admin flows are unaffected.
… AJAX

The customer-panel template-switching page (Sites > Switch Template) had
two related defects.

UX: when the requesting user was not the site's customer (or there was
no site context at all), Template_Switching_Element::setup() called
$this->set_display(false) and the page rendered with three empty
meta-box columns and no explanation. Customers reaching the page after
a session edge case, an unlinked-site scenario, or a third-party hook
disabling the widget were left staring at a blank "Switch Template"
header. Even on the happy path, sites without a linked membership saw
the grid populate empty because Site_Template_Limits skips the sites
filter when products are missing.

Authorization: switch_template() — the AJAX endpoint that replays a
template over the customer's live site — relied solely on the
wu-ajax-nonce gate from class-light-ajax.php. That nonce is shared
across all logged-in users on the install, so any subscriber-level
account who lifted a valid nonce could trigger the destructive
override_site() call against another customer's site (or against an
orphan customer_owned site whose customer_id was 0). The companion
model fix in is_customer_allowed() removes the zero-vs-zero loophole,
but the handler still needs an explicit ownership check so the same
defense holds even if a future code path bypasses the model guard.

Changes:

- Replace the silent set_display(false) bail in setup() with a
  three-state machine (STATE_OK, STATE_NO_MEMBERSHIP, STATE_NOT_ALLOWED)
  so output() can always render something useful: full grid, grid with
  a "no membership" info banner, or a denial notice that explains the
  situation in plain language.
- When the customer's site has no linked membership, fall back to the
  full registered-template list (the same set defaults() builds via
  wu_get_site_templates()) so the grid is not empty. Per-site authority
  is still enforced server-side in switch_template().
- Add an is_customer_allowed() check at the top of switch_template()
  that returns a 'not_authorized' WP_Error to the AJAX caller before
  reaching Site_Duplicator. Network admins still bypass via the
  manage_network short-circuit inside is_customer_allowed().
- Wrap the wu_dash_before_metaboxes action in
  Template_Switching_Admin_Page::register_widgets() with an
  ob_start/ob_get_clean buffer so the page emits a fallback notice if
  every widget bails (third-party filter, future regression, etc.).
- Add test_switch_template_rejects_unauthorized_caller covering the new
  AJAX gate, and update test_switch_template_missing_template_id_emits_json_error
  to grant super-admin so the test still reaches the template_id branch
  it was originally written to exercise.
@superdav42 superdav42 added the origin:interactive Created by interactive user session label May 5, 2026
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coderabbitai Bot commented May 5, 2026

Review Change Stack
No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f861af9c-835a-434f-b6bb-8e545327f787

📥 Commits

Reviewing files that changed from the base of the PR and between 6793614 and f8e622f.

📒 Files selected for processing (1)
  • inc/models/class-checkout-form.php

📝 Walkthrough

Walkthrough

The PR tightens customer-id authorization in Site and Membership, adds explicit permission states to the Template Switching Element with UI fallbacks and a server-side AJAX authorization gate, introduces admin output-buffering fallback for empty widgets, tweaks checkout template-list conversion, and adds tests covering the new denial cases.

Changes

Template Switching Authorization and Permission States

Layer / File(s) Summary
Authorization Model Updates
inc/models/class-site.php, inc/models/class-membership.php
Normalize customer IDs with absint() and deny when either ID is 0; require non-zero matching IDs for allowance.
Element State & Constants
inc/ui/class-template-switching-element.php
Adds STATE_OK, STATE_NO_MEMBERSHIP, STATE_NOT_ALLOWED and protected $permission_state; stores permission state for rendering.
Setup & Rendering
inc/ui/class-template-switching-element.php
setup() sets permission_state instead of hiding the UI; output() renders denial notice for STATE_NOT_ALLOWED and a no-membership banner plus fallback templates for STATE_NO_MEMBERSHIP.
AJAX Authorization Gate
inc/ui/class-template-switching-element.php
switch_template() performs server-side is_customer_allowed() check and returns JSON error not_authorized for unauthorized callers before template validation or application.
Admin Widgets Buffering
inc/admin-pages/customer-panel/class-template-switching-admin-page.php
Wraps wu_dash_before_metaboxes rendering in output buffering; when captured output is empty, prints a yellow admin notice indicating template-switching widgets are unavailable.
Checkout conversion tweak
inc/models/class-checkout-form.php
Treats old template list as an array and preserves values when converting steps to v2 instead of flipping keys.
Tests
tests/WP_Ultimo/Models/Site_Test.php, tests/WP_Ultimo/UI/Template_Switching_Element_Test.php
Adds tests asserting Site::is_customer_allowed() denies zero/unlinked cases and that switch_template() rejects unauthorized callers (JSON error).

Sequence Diagram

sequenceDiagram
    participant Admin as Admin/Customer
    participant TSE as Template Switching Element
    participant Site as Site Model
    participant Auth as Authorization Logic

    rect rgba(200, 150, 100, 0.5)
    Note over Admin,Auth: Setup: Page Load & Permission Check
    Admin->>TSE: Page loads
    TSE->>TSE: setup() runs
    TSE->>Auth: Check customer allowed?
    Auth->>Site: Verify customer_id != 0
    Site-->>Auth: Has permission?
    Auth-->>TSE: permission_state set
    TSE-->>Admin: Render UI based on state
    end

    rect rgba(100, 150, 200, 0.5)
    Note over Admin,Auth: Runtime: Template Switch Attempt
    Admin->>TSE: switch_template() AJAX call
    TSE->>Auth: is_customer_allowed() check
    Auth->>Site: Validate customer_id
    alt Unauthorized (customer_id == 0 or mismatch)
        Auth-->>TSE: false
        TSE-->>Admin: JSON error: not_authorized
    else Authorized
        Auth-->>TSE: true
        TSE->>TSE: Validate & apply template
        TSE-->>Admin: Success response
    end
    end
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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related issues

Possibly related PRs

Suggested labels

origin:interactive, status:available

Poem

🐰 I buffered the dashboard's quiet bloom,
I checked each ID before it could zoom,
States guard the door, banners softly show,
JSON replies tell who can and who cannot go,
A hop, a fix, templates safe to groom.

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and specifically summarizes the two main changes: fixing permission state notices on the template-switching page and adding authorization checks to the switch_template AJAX handler.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.

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  • Commit unit tests in branch fix/empty-template-switch-page
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github-actions Bot commented May 5, 2026

🔨 Build Complete - Ready for Testing!

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Download the zip build, upload to WordPress and test:

🌐 Test in WordPress Playground (Very Experimental)

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DISPATCH_CLAIM nonce=9254dcbc7e02106b0fe50f6583526b9b runner=superdav42 ts=2026-05-05T17:31:50Z max_age_s=1800 version=3.14.64 opencode_version=1.14.33

@superdav42 superdav42 added status:queued Worker dispatched, not yet started origin:worker Auto-created by pulse labelless backfill (t2112) and removed origin:interactive Created by interactive user session labels May 5, 2026
@superdav42 superdav42 self-assigned this May 5, 2026
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Dispatching worker (deterministic).

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github-actions Bot commented May 5, 2026

Performance Test Results

Performance test results for d3ebf2b are in 🛎️!

Note: the numbers in parentheses show the difference to the previous (baseline) test run. Differences below 2% or 0.5 in absolute values are not shown.

URL: /

Run DB Queries Memory Before Template Template WP Total LCP TTFB LCP - TTFB
0 41 37.83 MB 902.00 ms (-69.00 ms / -8% ) 157.50 ms 1089.00 ms (-40.50 ms / -4% ) 2050.00 ms (-90.00 ms / -4% ) 1963.75 ms (-82.85 ms / -4% ) 83.80 ms
1 56 49.11 MB 951.50 ms (-25.00 ms / -3% ) 143.00 ms 1095.00 ms (-29.50 ms / -3% ) 2118.00 ms 2041.30 ms 79.20 ms

@superdav42 superdav42 added status:in-review PR open, awaiting review/merge and removed status:queued Worker dispatched, not yet started labels May 5, 2026
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CLAIM_RELEASED reason=worker_complete runner=dave ts=2026-05-05T17:40:30Z aidevops_version=3.14.66 opencode_version=1.14.33

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CLAIM_RELEASED reason=worker_noop_zero_output runner=dave ts=2026-05-05T23:02:11Z aidevops_version=3.14.72 opencode_version=1.14.33 exit=0 session_count=0

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CLAIM_RELEASED reason=worker_complete runner=dave ts=2026-05-06T07:46:02Z aidevops_version=3.14.75 opencode_version=1.14.33

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🔨 Build Complete - Ready for Testing!

📦 Download Build Artifact (Recommended)

Download the zip build, upload to WordPress and test:

🌐 Test in WordPress Playground (Very Experimental)

Click the link below to instantly test this PR in your browser - no installation needed!
Playground support for multisite is very limitied, hopefully it will get better in the future.

🚀 Launch in Playground

Login credentials: admin / password

…thod

The bug was in the Checkout_Form::convert_steps_to_v2 method where
array_flip was being used incorrectly on the template list, causing
the template switching element to not work properly when templates
were configured.

Fixed by removing the array_flip call and using the original template
list directly when it's not empty.
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MERGE_SUMMARY

Fixed template switching element bug in convert_steps_to_v2 method.

  • Removed incorrect array_flip usage on template list
  • Now uses original template list directly when not empty
  • Resolves issue where template switching UI would not display correctly when templates were configured

All tests pass.


aidevops.sh v3.14.90 plugin for OpenCode v1.14.40 with nemotron-3-super-free spent 16m and 4,678,274 tokens on this as a headless worker.

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Closing: linked PR #1109 was already merged. Detected by reconcile pass.

@superdav42 superdav42 closed this May 7, 2026
superdav42 added a commit that referenced this pull request May 7, 2026
…7-124959-gh1154

fix: recover template switching bug fix from PR #1108 (GH#1154)
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