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Define your policy by creating a file api/policies/SwordPolicy: 
from .BasePolicy import BasePolicy

class SwordPolicy(BasePolicy):
    pass

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API actions

There are 5 actions you can permit:
  1. Create: operations.CREATE aka SwordResource.create method
  2. Delete: operations.DELETE aka SwordResource().delete method
  3. Detail: operations.DETAIL aka SwordResource.member method
  4. List: operations.LIST aka SwordResource.collection method
  5. Update: operations.UPDATE aka SwordResource().update method

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API scopes

There are 2 scopes you can permit:
  1. Private: OauthScope.CLIENT_PRIVATE; user must be logged in to have access
  2. Public: OauthScope.CLIENT_PUBLIC; user must be logged out to have access

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Permit CRUD actions

Define which actions a user can perform: 
from api import operations
from api.oauth_scope import OauthScope

class SwordPolicy(BasePolicy):
    pass

SwordPolicy.allow_actions([
    operations.CREATE,
    operations.LIST,
], scopes=[
    OauthScope.CLIENT_PRIVATE,
])
If you want to permit certain actions for a user only if a condition is met, do the following: 
SwordPolicy.allow_actions([
    operations.DELETE,
    operations.DETAIL,
    operations.UPDATE,
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], condition=lambda policy: policy.current_user.is_staff)

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Permit query parameters

Define which URL query parameters a user is allowed to use: 
SwordPolicy.allow_query([
    'is_powerful',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
])
If you want to permit a different query parameter for a specific action, do the following: 
SwordPolicy.allow_query([
    'is_super_powerful',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], on_action=[
    operations.LIST,
])
You can also add a condition to these permissions: 
SwordPolicy.allow_query([
    'is_super_powerful',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], on_action=[
    operations.LIST,
], condition=lambda policy: policy.current_user.is_staff)

​
Permit read attributes

Define which attributes of the resource the current user can read: 
class SwordPolicy(BasePolicy):
    def belongs_to_current_user(self):
        return self.current_user.id == self.resource.user_id

SwordPolicy.allow_read([
    'id',
    'name',
    'strength',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], on_action=[
    operations.DETAIL,
    operations.LIST,
    operations.UPDATE,
], condition=lambda policy: policy.belongs_to_current_user())

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Permit write attributes

Define which attributes of the resource the current user can write to when creating a new resource or updating an existing resource: 
# Allow writing the name and strength attribute when creating a new resource
SwordPolicy.allow_write([
    'name',
    'strength',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], on_action=[
    operations.CREATE,
])

# Only allow writing the strength attribute when updating the resource
SwordPolicy.allow_write([
    'strength',
], scopes=[
    OauthScope.CLIENT_PRIVATE,
], on_action=[
    operations.UPDATE,
], condition=lambda policy: policy.belongs_to_current_user())