Policy Storage

Casbin implements policy storage through adapters.

从.CSV文件加载策略

Loading from a CSV file is the standard approach. This method is straightforward for beginners and convenient when seeking help from the Casbin team.

Here's an example CSV file 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

备注

When CSV fields contain commas, wrap them 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)

When fields contain both commas and double quotes, wrap the field in double quotes and escape embedded 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 "")

适配器API

方法	类型	描述
LoadPolicy()	基础	从存储中加载所有策略规则
SavePolicy()	基础	将所有策略规则保存到存储中
AddPolicy()	可选	向存储中添加策略规则
RemovePolicy()	可选	从存储中移除策略规则
RemoveFilteredPolicy()	可选	从存储中移除与过滤器匹配的策略规则

数据库存储格式

你的策略文件

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

对应的数据库结构（如MySQL）

id	ptype	v0	v1	v2
1	p	data2_admin	data2	read
2	p	data2_admin	data2	write
3	g	alice	admin

每列的含义

id: Database primary key, not part of the Casbin policy. Generation method depends on the adapter implementation.
ptype: Corresponds to p, g, g2, etc.
v0-v5: Generic column names that map to policy CSV values from left to right. The number of columns depends on your policy definition. Most adapters implement 6 columns, though theoretically unlimited columns are possible. Submit an issue to the adapter repository if you need more columns.