Policy Storage

Policy storage in Casbin is handled by adapters. The enforcer loads and (optionally) saves policy through the adapter API.

Loading policy from a CSV file

Using a CSV file is the simplest option and works well for development and examples.

Example: examples/rbac_policy.csv

p, alice, data1, read
p, bob, data2, write
p, data2_admin, data2, read
p, data2_admin, data2, write
g, alice, data2_admin

notiz

If a field contains commas, wrap it in double quotes:

p, alice, "data1,data2", read    --correct
p, alice, data1,data2, read        --incorrect (the whole phrase "data1,data2" should be wrapped in double quotes)

If a field contains both commas and double quotes, wrap it in double quotes and escape internal quotes by doubling them:

p, alice, data, "r.act in (""get"", ""post"")"        --correct
p, alice, data, "r.act in ("get", "post")"            --incorrect (you should use "" to escape "")

See casbin#886.

Adapter API

Methode	Typ	Beschreibung
LoadPolicy()	Grundlegend	Laden Sie alle Richtlinienregeln aus dem Speicher
SavePolicy()	Grundlegend	Speichern Sie alle Richtlinienregeln im Speicher
AddPolicy()	optional	Fügen Sie eine Richtlinienregel zum Speicher hinzu
RemovePolicy()	optional	Entfernen Sie eine Richtlinienregel aus dem Speicher
RemoveFilteredPolicy()	optional	Entfernen Sie Richtlinienregeln, die dem Filter entsprechen, aus dem Speicher

Datenbankspeicherformat

Example policy (CSV)

p, data2_admin, data2, read
p, data2_admin, data2, write
g, alice, admin

Typical database layout (e.g. MySQL)

id	ptype	v0	v1	v2	v3	v4	v5
1	p	data2_admin	data2	lesen
2	p	data2_admin	data2	schreiben
3	g	alice	admin

Columns

• id — Primary key (adapter-specific; not part of Casbin policy).
• ptype — Policy type: p, g, g2, etc.
• v0–v5 — Policy fields in order (left to right in CSV). Most adapters use 6 columns; some support more. Check the adapter docs if you need extra fields.

For full adapter API and design details, see Adapters.