83 lines
2.5 KiB
Rego
83 lines
2.5 KiB
Rego
# METADATA
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# title: Transformation policy for per-diem compute
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# description: |
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# Only agent-per-diem-calculator may run expense.compute_per_diem.
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# Output must consist exclusively of items whose type is PER_DIEM_*,
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# each with a computed_from.transform_attestation_ref back-reference
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# and a positive amount. Enforces separation between LLM agents (free-form)
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# and deterministic compute agents (strict shape, no free-form fields).
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# authors:
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# - CTO Agent <cto@basicstack.de>
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# related_resources:
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# - ref: docs/architecture/v1.1.md#user-content-62-deterministische-regelwerke-am-beispiel-spesensätze-verpflegungsmehraufwand
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# - ref: schemas/expense/canonical/v1.2.0.json
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package proofedmesh.transformations.per_diem
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import rego.v1
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default allow := false
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allow if {
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input.agent_id == "agent-per-diem-calculator"
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input.operation == "expense.compute_per_diem"
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input.output_schema.name == "expense.canonical"
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input.output_schema.version == "1.2.0"
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all_items_are_per_diem
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all_items_have_computed_from
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all_amounts_positive
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}
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per_diem_types := {"PER_DIEM_FULL", "PER_DIEM_PARTIAL", "PER_DIEM_ARRIVAL", "PER_DIEM_DEPARTURE"}
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all_items_are_per_diem if {
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every item in input.output_payload.expense_items {
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item.type in per_diem_types
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}
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}
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all_items_have_computed_from if {
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every item in input.output_payload.expense_items {
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item.computed_from.transform_attestation_ref != ""
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}
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}
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to_cents(s) := n if {
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n := round(to_number(s) * 100)
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}
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all_amounts_positive if {
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every item in input.output_payload.expense_items {
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to_cents(item.amount) > 0
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}
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}
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deny_reason contains msg if {
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input.agent_id != "agent-per-diem-calculator"
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msg := sprintf("agent %s not allowed to compute per_diem", [input.agent_id])
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}
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deny_reason contains msg if {
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input.operation != "expense.compute_per_diem"
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msg := sprintf("operation %s not allowed", [input.operation])
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}
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deny_reason contains msg if {
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input.agent_id == "agent-per-diem-calculator"
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input.operation == "expense.compute_per_diem"
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not all_items_are_per_diem
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msg := "compute output must contain only PER_DIEM_* typed items"
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}
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deny_reason contains msg if {
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input.agent_id == "agent-per-diem-calculator"
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input.operation == "expense.compute_per_diem"
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not all_items_have_computed_from
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msg := "every computed item must carry computed_from.transform_attestation_ref"
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}
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deny_reason contains msg if {
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input.agent_id == "agent-per-diem-calculator"
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input.operation == "expense.compute_per_diem"
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not all_amounts_positive
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msg := "all computed per-diem amounts must be strictly positive"
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}
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