docs(08-01): complete session bug fix plan

Tasks completed: 1/1
- Replace session_id() with unique form_id pattern

SUMMARY: .planning/phases/08-bugfixes-legacy-parity/08-01-SUMMARY.md
This commit is contained in:
2026-02-06 22:56:37 +09:00
parent 28fcfcca34
commit 94958ae7bb
2 changed files with 121 additions and 11 deletions

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@@ -10,18 +10,18 @@ See: .planning/PROJECT.md (updated 2026-01-16)
## Current Position
Phase: 8 of 9 (Bug Fixes & Legacy Parity)
Plan: Not started
Status: Ready to plan
Last activity: 2026-02-06 — Added gap closure phases from milestone audit
Plan: 1 of 2 complete
Status: In progress
Last activity: 2026-02-06 — Completed 08-01-PLAN.md (session bug fix)
Progress: ███████░░ 78% (7/9 phases)
Progress: ███████░░ 84% (8/9.5 plans)
## Performance Metrics
**Velocity:**
- Total plans completed: 7
- Average duration: ~45 min per phase
- Total execution time: ~5.5 hours
- Total plans completed: 8
- Average duration: ~30 min per plan
- Total execution time: ~4 hours
**By Phase:**
@@ -34,7 +34,7 @@ Progress: ███████░░░ 78% (7/9 phases)
| 5 | 1 | Real-time calculations with German decimal support |
| 6 | 1 | Form handler, email generator, wp_mail() integration |
| 7 | 1 | Captcha verification and inline validation |
| 8 | | Bug fixes & legacy parity (gap closure) |
| 8 | 1/2 | Bug fixes & legacy parity (gap closure) |
| 9 | — | Internationalization (gap closure) |
**Overall Trend:**
@@ -55,6 +55,9 @@ Recent decisions affecting current work:
| 1 | Capability: edit_posts | Allow editors and admins (not just admins) |
| 1 | Menu position 25 | Below Comments, logical grouping |
| Audit | Fix all 4 gaps for v1.0 | Full legacy parity before shipping |
| 8-01 | Use uniqid('', true) with more_entropy | Extra entropy prevents collisions under high traffic |
| 8-01 | Pass form_id via hidden field + GET param | WordPress-native, no sessions needed |
| 8-01 | Delete transient after display | Prevents stale errors on refresh |
### Deferred Issues
@@ -68,7 +71,7 @@ None.
## Session Continuity
Last session: 2026-02-06
Stopped at: Created gap closure phases 8-9
Last session: 2026-02-06T13:55:34Z
Stopped at: Completed 08-01-PLAN.md
Resume file: None
Next up: Plan phase 8 (Bug Fixes & Legacy Parity)
Next up: Plan 08-02 (Additional work sections and Sonstiges integration)

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@@ -0,0 +1,107 @@
---
phase: 08-bugfixes-legacy-parity
plan: 01
subsystem: form-validation
tags: [wordpress, transients, form-handling, error-display]
# Dependency graph
requires:
- phase: 07-captcha-validation
provides: Captcha verification and validation error handling
provides:
- Per-submission unique form IDs preventing error cross-contamination
- Consistent error format for both captcha and validation errors
- WordPress-native transient keys using hidden field pattern
affects: [08-02, any future form validation work]
# Tech tracking
tech-stack:
added: []
patterns:
- "Hidden form ID with uniqid() for per-submission transient keys"
- "Consistent error format: array('messages' => [...], 'fields' => [...])"
- "GET parameter for form_id to retrieve errors after redirect"
key-files:
created: []
modified:
- includes/class-form-renderer.php
- includes/class-form-handler.php
key-decisions:
- "Use uniqid('', true) with more_entropy for collision resistance under load"
- "Pass form_id via hidden field and GET parameter (no sessions, no cookies)"
- "Delete transient immediately after display to prevent stale errors"
patterns-established:
- "Form error handling: Hidden field → POST → Transient → Redirect with GET param → Display → Delete"
- "Validation error wrapping: Always use 'messages' and 'fields' keys for consistency"
# Metrics
duration: 1min
completed: 2026-02-06
---
# Phase 8 Plan 1: Session Bug Fix Summary
**Replaced unreliable session_id() with unique form_id using uniqid() and hidden fields, fixing production-blocking error cross-contamination between users**
## Performance
- **Duration:** 1 min
- **Started:** 2026-02-06T13:54:24Z
- **Completed:** 2026-02-06T13:55:34Z
- **Tasks:** 1
- **Files modified:** 2
## Accomplishments
- Eliminated session_id() bug causing all users to share 'umzugsliste_errors_default' transient key
- Implemented WordPress-native hidden field pattern for per-submission unique IDs
- Fixed validation error format inconsistency (flat array vs array with 'messages' key)
- Both captcha and validation errors now use consistent structure
## Task Commits
Each task was committed atomically:
1. **Task 1: Replace session_id() with hidden form ID in renderer and handler** - `28fcfcc` (fix)
**Plan metadata:** (will be committed separately with STATE.md)
## Files Created/Modified
- `includes/class-form-renderer.php` - Generate unique form_id with uniqid(), retrieve errors via GET parameter, add hidden field
- `includes/class-form-handler.php` - Extract form_id from POST, use for transient keys, redirect with form_id query param, wrap validation errors in proper format
## Decisions Made
- **Use uniqid('', true) with more_entropy parameter:** Extra entropy prevents collisions under high traffic
- **Pass form_id via hidden field and GET parameter:** WordPress-native approach that works on all hosting (no session_start() required)
- **Delete transient immediately after display:** Prevents stale errors from persisting on page refresh
- **Wrap validation errors in array with 'messages' key:** Matches captcha error format expected by render_validation_errors()
## Deviations from Plan
None - plan executed exactly as written.
## Issues Encountered
None - straightforward implementation following research patterns.
## User Setup Required
None - no external service configuration required.
## Next Phase Readiness
Error handling foundation is solid. Ready to:
- Integrate additional work sections (Plan 08-02)
- Add Sonstiges free text field (Plan 08-02)
- No blockers or concerns
Technical notes for future work:
- The form_id pattern can be reused for any per-submission tracking needs
- Transient expiration (300s) is appropriate for form errors but can be adjusted if needed
- The error format ('messages' + 'fields' arrays) supports field-specific error highlighting if implemented later
---
*Phase: 08-bugfixes-legacy-parity*
*Completed: 2026-02-06*