Who may do what to a packet, and when. This file is written from the code in `server/packetstation/policy/`. When they disagree, the code is the rule and this file is out of date.
The policy is a Python port of the old `guard.js`. It runs only on the server. Every packet write calls `policy.check()` inside the write transaction, under the packet row lock. Every packet read returns `can`, `blocked` and `holder` from the same rules, so the screens only show what the server will accept.
The package is pure functions with no I/O:
-`actions.py`: the `Action` enum, the `Who` predicates, the `Rule` record and the `RULES` table.
Every role comes from an AD group (see docs/SECURITY.md). The role strings are `admin`, `clerical`, `clerical_supervisor`, `warehouse`, `warehouse_supervisor`, `qc`, `qc_supervisor`, `pm` and `shop:<code>:<worker|lead|supervisor>`. A person's roles are the union of their groups.
`principal_from_roles(user_id, roles, station_limits=(), session_kind="password")` builds the policy's `Principal`:
| Field | Meaning |
|---|---|
| `admin` | In PS-Admins. Admin is not membership. It is the bypass rule below. |
| `support` | The codes among CL, WH and Q.C. the person belongs to, at any level. A supervisor role implies membership. |
| `support_sup` | The codes among CL, WH and Q.C. where the person is Supervisor. |
| `shop` | Shop department code to level: 1 worker, 2 lead, 3 supervisor. The highest level wins. |
| `station_limits` | Station ids a worker is limited to. Empty means any station. |
| `pm` | Project Management. PM can read every packet and change nothing. |
| `session_kind` | `password` or `pin`. |
| `system` | `visual-feed` for the worker. Never set from a session. |
`works_on(principal, state)`: a member of the packet's department. Leads and supervisors always pass. A worker passes when they have no station limits, or the limits hold the packet's station. START and SUBMIT also need the assigned welder for a worker (see the tightenings).
`holder_name(state, dept_name, station_name)` gives the text for messages: "Clerical", "Warehouse", "Q.C.", "Clerical (data book)", "the data book (filed)", else the department name, plus " · <station>" while the packet is at a station.
Statuses in workflow order: draft, warehouse, ready, assigned, in_progress, review, qc, complete, filed. SHOP is ready, assigned, in_progress and review. ACTIVE is assigned and in_progress.
## Who
| Who | Passes when |
|---|---|
| CL, WH, QC | A member of that support department, any level |
| CL_SUP, WH_SUP, QC_SUP | Supervisor of that support department |
| CL_OR_QC | A member of Clerical or Q.C. |
| HOLDER | Holds the packet (custody above) |
| DEPT_LEAD | Lead or supervisor in the packet's department |
| DEPT_SUP | Supervisor in the packet's department |
| WORKS_ON | Lead or above in the department, or a worker in the department who is the assigned welder and whose station limits allow the station |
| CO_VERIFIER | Supervisor of the department named in the request: a shop Supervisor for a shop code, WH or Q.C. Supervisor for WH or QC. Clerical never verifies. |
| ADMIN | In PS-Admins |
| SYSTEM | The worker (`system` is set) |
## Rule table
`from` is the set of statuses the action starts from. "any" means any status, with the filed lock applied separately. `co hold` means an open change order holds the step.
| Action | Who | From | To | Dept | CO hold | Preconditions | Signature | Reason |
Each precondition is a named predicate over the packet state and the request input. They are never bypassed, Admin included. The first one that fails gives the message.
| Name | Passes when | Message |
|---|---|---|
| heat_map_answered | heat_map is yes or no | Say whether this packet needs a heat map. |
| drawing_attached | a drawing is attached | Attach the drawing first. |
| bom_all_pulled_or_short | every line not marked n/a is pulled or has an open short | Pull every material line or mark it short first. |
| heats_recorded | no line needs a heat: every line that is not N/A, not a sub-assembly, is pulled and issued pieces has a heat | Scan or type the heat number of every pulled line first. Use N/A for a part with no traceability. |
| short_open | at least one BOM line has an open short (the old whCanReceive) | No part is short on this packet. |
| welder_set (input) | the request gives station_id and welder_id | Pick a station and a welder. |
| checklist_complete | every key of the department checklist is done | Finish the checklist first. |
| welds_recorded | at least one weld, in a weld department | Record at least one weld first. |
| filler_set | filler metal entered, in a weld department | Enter the filler metal first. |
| qc_book_spool_location (input) | book and spool confirmed and a location given | Confirm the book and the spool, and give the location. |
| qc_missing_empty | the Q.C. record has nothing missing | Q.C. still needs: (the list). |
| reason_given (input) | a reason of at least 8 characters after cleaning | Give a reason of at least 8 characters. |
| vclosed_if_databook | routed to Shipping, or closed in VISUAL | Close the job in VISUAL first. |
| co_staged_if_dwg_change (input) | no drawing change, or the new drawing is staged (phase 3) | Stage the new drawing for the change order first. |
| route_given (input) | routed_to is databook or shipping | Choose Data Book or Shipping. |
| target_dept_given (input) | a shop department different from the packet's; from a draft any shop department | Choose a department. / Choose a different department. |
"(input)" marks a precondition that reads request input, not packet state. `can()` skips those.
`check(principal, state, action, *, extra={}, it_reason=None) -> Decision` runs these in this order and stops at the first failure:
1.**Removed.** A removed packet refuses everything, Admin included. Code `removed`.
2.**Status.** The status must be in the rule's from set. RETURN_TO_CLERICAL also needs wh_skipped. SET_VCLOSED also needs routed_to databook. An unknown status fails here too. Code `wrong_status`.
3.**Change-order hold.** A held action refuses while an approved change order waits for verification, or a pending one is on hold. Admin included. Code `co_hold`, with the hold text.
4.**System.** A system-only action refuses every person (`system_only`). The system principal passes only system-only actions (`forbidden`).
5.**Admin bypass.** An admin who is not allowed by the rule's Who passes who and custody when an IT reason of at least 8 characters is given. Without one the code is `it_reason_required`. SET_DATABOOK_AT needs no reason. The decision is marked `admin_bypass`, and the write marks the log row as an IT edit.
6.**Filed lock.** A filed packet refuses everything except SET_DATABOOK_AT and ADMIN_REOPEN, Admin included. Code `filed`: "This packet is filed and locked. IT can reopen it if a correction is needed."
7.**Who and custody.** Code `forbidden`. For a step: "Your access doesn't allow this step." For an edit: "Your access doesn't allow changing (what) on this packet. It's with (holder) right now." PM fails here for everything.
8.**Preconditions,** in rule order, never bypassed. Code `precondition` with the message, or `reason_required` when the missing piece is the rule's reason, so the screen can ask for one.
`Decision` carries `ok`, `code`, `why`, `admin_bypass`, `signature` (the meaning text when the rule needs one) and, in read mode only, `reasons`.
The packet API answers 403 with the code for most failures, and 400 for `it_reason_required` and `reason_required`.
These actions need a signature: submit, send_to_qc, route_from_review, qc_reject, qc_accept, qc_accept_and_route, file, admin_reopen, edit_document_set (attach only), rev_approve, co_issue, co_approve, co_reject, co_verify, itp_block_sign and itp_sign_off. The rule's signature text is the meaning that is signed.
The request carries `sign: {factor, secret}`. The write pipeline calls the phase 1 helper `packetstation.auth.signatures.sign()` inside the same transaction, after the policy passes. It checks the PIN or domain password against the session's own user. A PIN works in any session. It logs the attempt and applies the five-strike PIN disable and the three-strike session end. It writes an append-only `signatures` row with the user, session, account, display name, session kind, factor, action, meaning, packet, subject and a sha256 over the canonical JSON of what was signed (the action, the packet id, the expected state and the request fields). The `packet_transitions` and `packet_log` rows point at it.
- **Workflow steps** are compare-and-set on `expect: {status, dept}` under the packet row lock (`SELECT ... FOR UPDATE`). When the packet moved on, the answer is 409 `stale_step` "Someone else already took this step." with the current status, department and version. There is no packet version check on a step, so a weld edit never blocks a send. Side effects run in the same transaction.
- **Keyed child rows** (BOM lines, Q.C. inspections, stage fields, welds, heat tags) take `If-Match: <row_version>`. A mismatch is 409 `row_conflict` with the current row.
- **Numbers** for welds, heat tags, pages and change orders come from counters on the packet row under the row lock, so concurrent adds never collide.
- **Header scalars** use field-level compare-and-set: the body sends `set` and `base`. A key whose base differs from the current value is 409 `field_conflict` with the current value. A key with no base is written as is.
- **Work orders** are a draft-only full replace with If-Match on the packet version.
- **Shorts and change-order actions** are state compare-and-set. Checklist keys are written one key at a time. The heat table position is an idempotent upsert. A change-order verification is an insert, so a second one is "already verified".
- **Append-only tables** never conflict: packet_transitions, packet_log, qc_history, short_receipts, project_renumbers, itp_rejects and co_verifications. Triggers refuse UPDATE, DELETE and TRUNCATE, and the app role has no grant for them.
## Reads: can, blocked and holder
Every packet read returns:
-`can`: the actions that pass now. Input-only preconditions are skipped, because they are what the user gives with the step.
-`blocked`: the actions that pass who and custody but fail a state precondition or the change-order hold, with every reason. The screen shows the control disabled with the reason.
-`holder`: `holder_name()` for the packet.
`can(principal, state, assume_it_reason=True) -> (list[Action], dict[Action, list[str]])`. For an admin the IT reason is assumed, so the list shows what the admin may do once they give one. `evaluate(principal, state, action)` returns the read-mode decision with `admin_bypass` set, so the screen knows to ask for the reason. System-only actions are never listed. CO_VERIFY needs a department in the request, so it is not listed; the change order list says which departments the person can verify.
The warehouse stage is `packet_wh`, separate from the packet status. SET_WH_STAGE (WH, status warehouse) moves it, compare-and-set on `expect_stage` (409 `stale_step` when it moved on).
| From | To |
|---|---|
| incoming | pulling, hold |
| pulling | pulled, hold |
| hold | pulling |
| pulled | pulling |
A move to the same stage, or one not in the table, is 409 `wh_transition`. A packet with no `packet_wh` row is at incoming. The first Pulled tick on a line while the stage is incoming or on hold starts pulling by itself (`auto` true).
### Hold reasons
A closed set, checked on the server:
- Waiting on material (not in stock)
- Waiting on purchasing / PO
- Question for engineering or clerical
- Drawing / BOM problem
- Other
Any other text is 400 `invalid_reason` "Pick one of the hold reasons." "Other" needs a note, else 400 `reason_required` "Say what it's waiting on." The note is cleaned and cut to 200 characters.
### Short reasons
A closed set, checked on the server:
- Not in stock
- On order
- Back-ordered
- Damaged / rejected
- Wrong part received
- Needs cutting / prep
- Other
Any other text is 400 `invalid_reason` "Pick one of the short reasons." A short has a quantity from 1 to the line quantity, a reason, an optional PO or requisition, an optional expected date, an optional note, and the optional heat of the pieces that were pulled (never on an N/A line). Opening, editing and clearing a short is edit_bom, so the holder decides. In practice that is the warehouse.
### The release gate
WH_RELEASE checks two preconditions, in this order:
1.`bom_all_pulled_or_short`: every line not N/A is pulled or has an open short.
2.`heats_recorded`: no line needs a heat. A line needs a heat when it is not N/A, not a sub-assembly (`sub` is `Y`; its heat is on its own packet), is pulled, has issued more than 0 and has no heat.
Both are state preconditions, so `blocked.wh_release` lists the failing message and the screen shows Release disabled with it. Heat numbers are checked against the old pattern: letters, numbers, space . / # _ - only, up to 40 characters, starting with a letter or a number. A bad heat is 422 `invalid_heat`.
### Receive by custody
Receiving short parts (`POST .../bom/{item}/short/receipts`) picks its action from the person:
- A member of the warehouse (WH in `support`) receives through WH_RECEIVE_SHORT, in any status but filed, while the line has an open short. The warehouse does not need to hold the packet.
- Anyone else receives through EDIT_BOM, so only the holder may: the lead or supervisor of the department that has the packet, Q.C. at Q.C., Clerical in draft.
- Everyone else is refused by the policy (403 `forbidden`).
The warehouse still cannot change any other field of a packet it no longer holds. EDIT_BOM stays the holder's. A receipt needs a heat unless the line is N/A, and its quantity is 1 to what is still open.
### MTR files
The MTR on a line must be an asset whose type is PDF, PNG or JPEG. Anything else, or an asset that is not there, is 422 `invalid_asset`. Clearing the MTR is allowed.
### Packet log texts
The `action` column of `packet_log` for each warehouse write. `{item}` is the BOM item number.
| Write | action | note |
|---|---|---|
| Heat typed or scanned | `Heat recorded · item {item}` | the heat |
| Short opened | `Short recorded · item {item}` | `{qty} of {need} short · {reason} · {ref} · ETA {eta}`, parts present only |
| Short edited | `Short updated · item {item}` | the same as recorded |
| Not short after all | `Short cleared · item {item}` | |
| Short received | `Short received · item {item}` | `{qty} pc · heat {heat} · {still} still short` or `... · short closed`, then ` · packet {status}` (lower case) and ` in {station}` when at a station |
| Stage incoming to pulling | `Warehouse: Started pulling` | |
| Stage to hold | `Warehouse: Put on hold` | `{reason} · {note}` |
| Stage pulling to pulled | `Warehouse: Marked pulled, ready for production` | |
| Stage hold to pulling | `Warehouse: Pulling resumed` | |
| Stage pulled to pulling | `Warehouse: Back to pulling` | |
| wh_release | `Released to supervisor`, or `Released to supervisor with {n} short` when shorts are open | `{heats} heats recorded`, plus ` · SHORT: item {item} ×{qty_open} ({reason}), ...` when shorts are open |
| wh_send_back | `Sent back to Clerical` | the reason |
When a Pulled tick starts pulling by itself, there is no separate stage row in the log: the line's own row gets ` · started pulling` or ` · pulling resumed` on its note. Every write above also writes its audit row through the write pipeline, with `detail.item`, `wh_from` and `wh_to` as before, and `detail.qty` on short writes.
The worker has no session. It writes through the same policy as a person, as the system principal `Principal(user_id=None, system="visual-feed")`. Each write locks the packet row (`FOR UPDATE SKIP LOCKED`; a row locked by someone else is left for the next run), builds the packet state, runs `policy.check()`, makes its change, bumps `version`, and writes a `packet_log` row (by nobody, by name "VISUAL feed", role `system`), an audit row (`packet.<action>`, role `system`) and a change event. See [FEED.md](FEED.md) for when each write happens.
| Action | From | What the worker does |
|---|---|---|
| vis_update_draft | draft | Updates a draft made by the feed: work orders, BOM (unless uploaded by hand), drawing and rev, dates, flags, drawing pages from M-Files. |
| vis_retire_draft | draft | Soft-removes an untouched draft whose work orders all moved to another packet, reason `moved`. |
| vis_open_co | any but draft and filed | Opens, re-aims or withdraws the packet's one pending feed change order, stages a drawing on it, and records drawing flags on a packet past draft. |
| vis_auto_release | draft to warehouse | Sends a ready draft to the warehouse. Same preconditions as send_to_warehouse (heat map answered, drawing attached). The feed only picks drafts with no flags and the rev confirmed by the drawing job. |
What the feed may write:
- Drafts it made, in place, through vis_update_draft and vis_retire_draft.
- New drafts, projects and units (`created_by` null, audit role `system`).
- The order-derived fields of projects and units, only where the value came from VISUAL. A value Clerical typed is never overwritten.
- On packets past draft: only a change order (vis_open_co), the observed VISUAL state (leg statuses, closed, cancelled, work order gone, ticket hours) and the drawing flags.
- Its own tables: the caches, `drawing_lookups`, the job tables.
What the feed may never write:
- Shop-side tables: stages, welds, heat tags, checklists, the clock, warehouse pulls and shorts, Q.C. records, seals. In-shop packets only get a change order.
- A removed packet. A key whose packets are all removed is never made again.
- A filed packet.
- Any person's action. The system principal passes only the vis_* actions, and people can never take them.
- VISUAL or M-Files. Both libraries are read-only.
### Rev approval
When M-Files has a different released rev from VISUAL, the drawing job stages the M-Files copy. A Clerical Supervisor (PS-Clerical-Supervisor) can approve it on a draft with rev_approve: a reason of at least 8 characters and a signature ("Approve the M-Files revision"). The pages are attached and the approval is kept on the packet (`visual.rev_ok`). With nothing staged the answer is 409 `nothing_staged`.
### Hand uploads on flagged drafts
On a draft made by the feed that is flagged (or already has a hand upload), Clerical can upload a drawing (edit_document_set) or a BOM (edit_bom) by hand. Both need a reason and a signature. A hand drawing sets `drawing_state``hand` and flag `hand_drawing`; a hand BOM sets flag `hand_bom` and the feed stops replacing the BOM. An unflagged draft refuses with 409 `not_flagged`. Auto-release never takes a hand-flagged draft, so a person sends it on. "Use VISUAL's BOM again" removes the hand BOM.
### Change orders from the feed
- A pending feed change order holds nothing, unless Clerical puts it on hold (co_hold_toggle). Then it blocks the held steps until released or decided.
- Approval (co_approve, Clerical, signature) applies the staged change to the packet: work orders, BOM, drawing and rev. When the drawing changed, the new drawing must be staged first (`co_staged_if_dwg_change`, 409 `co_not_staged`). The old drawing pages are voided, not deleted.
- After approval a major change order asks the departments it touches to verify (co_verify), and holds the packet until they have.
- A minor change order (only target hours or the want date changed) needs Clerical approval only. No department is asked to verify, so it holds nothing after approval.
- Rejection (co_reject) needs a reason and a signature. The feed does not reopen a change order Clerical rejected for the same target.
The old policy was looser than the old screens in places. The rebuild follows the screens where they were stricter, and the README where it states the intent. Each row is a change Seth can veto.
| What the old build allowed | What the rebuild does | Why | Can be vetoed |
|---|---|---|---|
| A department lead could write welds, BOM, heat tags, the checklist, stage fields and the clock through the policy whenever the packet was in a shop status. | These edits need the holder of the packet (the holder rule, applied as the old screens did). A lead of another department cannot. | The screens only offered these to the holder. The policy now matches. | Yes |
| Any worker in the department within their station limits could start or submit a packet (`worksOn` ignored who was assigned). | START and SUBMIT need the assigned welder for a worker. Leads and supervisors still can. | The README says only the assigned worker. | Yes |
| A status change could carry any other field in the same save. | A transition carries only its own fields (the step's inputs). Other changes go through their own edit actions and rules. | One rule per write keeps the check honest. | No |
| Clerical "lead" actions (approve an M-Files rev mismatch, move back from VISUAL review) were open to any Clerical member with a lead flag. | REV_APPROVE and moving back from VISUAL review need Clerical Supervisor (PS-Clerical-Supervisor). | There is no Clerical lead AD group. | Yes |
| A packet routed to Shipping had no path to filed. | Complete packets routed to Shipping get the same Clerical close and file path. Only the Data Book route needs the VISUAL close before filing. | Shipping packets were stuck at complete. | Yes |
| Anyone could set the data book date, even on a filed packet. | SET_DATABOOK_AT is Clerical or Q.C. only (open question 17). It stays allowed on a filed packet. | The data book date is a Clerical and Q.C. record. | Yes |
| Change-order verifications were stored in the packet document, with no rule against changing them later. | Verifications are insert-only and cannot be withdrawn (open question 18). | A signed verification is a record. | Yes |
| The old policy did not look at the BOM when the warehouse released a packet. | WH_RELEASE needs every BOM line not marked n/a to be pulled or to have an open short. | A packet should reach the shop with its material, or with the shorts on record. | Yes |
| The old screen asked for a heat number on every pulled line before release, but the policy did not check it. | WH_RELEASE also needs a heat on every pulled line that issued pieces, unless the line is N/A or a sub-assembly (`heats_recorded`), checked on the server. | Traceability is the point of the pull. The screen alone could be skipped. | Yes |
| Hold reasons and short reasons were any text the screen sent. | Both are closed sets checked on the server. "Other" on a hold needs a note. | The board and the shorts table group and report on the reason, so it must be one of the list. | Yes |
| A hand draft could leave Clerical with no drawing (the packet PDF upload stood in for it). | A hand draft needs a drawing attached before any send from Clerical. | There is no packet PDF upload in the rebuild. | Yes |
| Attaching drawing pages by hand needed no signature. | Attaching a drawing by hand needs a signature ("Attach a drawing by hand"). | It replaces what M-Files would supply, so a person stands behind it. | Yes |
| Admin could write anything on a filed packet with an IT reason. | Admin cannot write a filed packet except through ADMIN_REOPEN (with a reason and a signature), and SET_DATABOOK_AT. | A filed packet is sealed. A change breaks the seal on purpose, on record. | No |
| Admin passed every check after the change-order hold, so an admin could make a step from any status. | Admin goes through the same status check. The bypass covers who and custody only. Preconditions still apply. | Admin fixes data, not the workflow order. | Yes |
| A hand drawing or BOM upload on a flagged VISUAL draft took a reason of 3 characters and a PIN sign-off checked in the browser. | Both need a reason of at least 8 characters and a signature verified on the server, kept on the packet with who and when. | A hand upload stands in for VISUAL or M-Files, so a person stands behind it. | Yes |
| Approving a different M-Files rev was open to a Clerical lead. | rev_approve needs Clerical Supervisor, with a reason and a signature. | There is no Clerical lead AD group, and the approval overrides VISUAL. | Yes |
| The Sync on a Clerical PC skipped removed packets ("removed here, not re-made"), but only as the browser saw them. | A removed packet's key is never recreated, whatever VISUAL says. The match runs on the server across live and removed rows, in the feed's transaction. | A removal is a decision. The feed does not undo it. | No |
| The Sync saved through the same packet document that held the shop's work, so nothing but the code kept it off the shop's fields. | The feed never writes shop-side tables. Packets past draft only get a change order, observed VISUAL state and drawing flags. | The shop's record is the shop's. | No |
