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graph LR
    Enforcer_Core["Enforcer Core"]
    Model_Definition["Model Definition"]
    Policy_Management["Policy Management"]
    Policy_Persistence["Policy Persistence"]
    File_Policy_Adapter["File Policy Adapter"]
    Role_Manager["Role Manager"]
    Enforcer_Core -- "Uses" --> Model_Definition
    Enforcer_Core -- "Queries" --> Policy_Management
    Enforcer_Core -- "Consults" --> Role_Manager
    Policy_Management -- "Loads/Saves Via" --> Policy_Persistence
    Policy_Management -- "Builds Links With" --> Role_Manager
    Policy_Persistence -- "Implemented By" --> File_Policy_Adapter
    click Enforcer_Core href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/pycasbin/Enforcer_Core.md" "Details"
    click Model_Definition href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/pycasbin/Model_Definition.md" "Details"
    click Policy_Management href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/pycasbin/Policy_Management.md" "Details"
    click Policy_Persistence href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/pycasbin/Policy_Persistence.md" "Details"
    click Role_Manager href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/pycasbin/Role_Manager.md" "Details"
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Details

The pycasbin library implements a robust Policy-based Access Control (PBAC) system, with its core functionality residing in the Enforcer Core. This central component acts as the decision-making engine, evaluating authorization requests by dynamically referencing the Model Definition for policy structure and the Policy Management component for the actual policy rules. For complex hierarchical access control, the Enforcer Core seamlessly integrates with the Role Manager. Data persistence for policies is abstracted through the Policy Persistence interface, allowing for various storage backends, exemplified by the File Policy Adapter. This architecture promotes a clear separation of concerns, enabling high extensibility and adaptability for diverse authorization requirements, making it ideal for visual representation as a flow graph where data and control flow between distinct, pluggable components.

Enforcer Core [Expand]

The central Policy Enforcement Point (PEP) responsible for evaluating authorization requests against the loaded model and policy. It orchestrates the decision-making process.

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Model Definition [Expand]

Manages the Casbin model definition, which specifies the structure of the access control policy (e.g., request, policy, matcher, and effect configurations).

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Policy Management [Expand]

The in-memory repository for all authorization policy rules. It provides fast access to policy data during enforcement and handles the addition, removal, and querying of policy rules.

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Policy Persistence [Expand]

Defines the standard interface for persisting and loading policy rules from various external storage backends (e.g., files, databases). Concrete adapters implement this interface.

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File Policy Adapter

A concrete implementation of the Policy Persistence Adapter Interface specifically for file-based policy storage. This component handles the actual file I/O operations for policy rules.

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Role Manager [Expand]

Manages role-based access control (RBAC) relationships, including user-role and role-role hierarchies. It provides an interface for querying and manipulating these relationships.

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FAQ