feat: add pycasbin adopter and test. (#164)

* fix: fix FileAdapter::SavePolicy

Signed-off-by: stonex <[email protected]>

* feat: add pycasbin::Adopter and test

Signed-off-by: stonex <[email protected]>

Author: sheny1xuan

bindings/python/CMakeLists.txt

@@ -22,6 +22,7 @@ set(SOURCES
     py_model.cpp
     py_config.cpp
     py_synced_enforcer.cpp
+    py_adapter.cpp
 )
 
 set(HEADERS

bindings/python/main.cpp

@@ -40,6 +40,7 @@ PYBIND11_MODULE(pycasbin, m) {
     bindPyModel(m);
     bindPyConfig(m);
     bindPySyncedEnforcer(m);
+    bindPyAdapter(m);
 
     m.attr("__version__") = PY_CASBIN_VERSION;
 }

bindings/python/py_adapter.cpp

@@ -0,0 +1,70 @@
+/*
+* Copyright 2021 The casbin Authors. All Rights Reserved.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h>
+#include <casbin/casbin.h>
+
+#include "py_casbin.h"
+
+namespace py = pybind11;
+
+void bindPyBaseAdapter(py::module& m) {
+    // Base Adapter use shared_ptr to manage
+    // must expose this interface for enforcer build
+    py::class_<casbin::Adapter, std::shared_ptr<casbin::Adapter>>(m, "Adapter")
+        .def("LoadPolicy", &casbin::Adapter::LoadPolicy, "LoadPolicy loads all policy rules from the storage.")
+        .def("SavePolicy", &casbin::Adapter::SavePolicy, "SavePolicy saves all policy rules to the storage.")
+        .def("AddPolicy", &casbin::Adapter::AddPolicy, "AddPolicy adds a policy rule to the storage.")
+        .def("RemovePolicy", &casbin::Adapter::RemovePolicy, "RemovePolicy removes a policy rule from the storage.")
+        .def("RemoveFilteredPolicy", &casbin::Adapter::RemoveFilteredPolicy, "RemoveFilteredPolicy removes policy rules that match the filter from the storage.")
+        .def("IsFiltered", &casbin::Adapter::IsFiltered, "IsFiltered returns true if the loaded policy has been filtered.");
+}
+
+void bindPyBatchAdapter(py::module &m) {
+    py::class_<casbin::BatchAdapter, casbin::Adapter, std::shared_ptr<casbin::BatchAdapter>>(m, "BatchAdapter")
+        .def("AddPolicies", &casbin::BatchAdapter::AddPolicies, "")
+        .def("RemovePolicies", &casbin::BatchAdapter::RemovePolicies, "");
+}
+
+void bindPyFileAdapter(py::module &m) {
+    // File adapter inhert base adapter and use shared_ptr to manage
+    py::class_<casbin::FileAdapter, casbin::Adapter, std::shared_ptr<casbin::FileAdapter>>(m, "FileAdapter")
+        .def(py::init<std::string>(), "")
+        .def_static("NewFileAdapter", &casbin::FileAdapter::NewFileAdapter, "")
+        .def("LoadPolicy", &casbin::FileAdapter::LoadPolicy, "LoadPolicy loads all policy rules from the storage.")
+        .def("SavePolicy", &casbin::FileAdapter::SavePolicy, "SavePolicy saves all policy rules to the storage.")
+        .def("AddPolicy", &casbin::FileAdapter::AddPolicy, "AddPolicy adds a policy rule to the storage.")
+        .def("RemovePolicy", &casbin::FileAdapter::RemovePolicy, "RemovePolicy removes a policy rule from the storage.")
+        .def("RemoveFilteredPolicy", &casbin::FileAdapter::RemoveFilteredPolicy, "RemoveFilteredPolicy removes policy rules that match the filter from the storage.")
+        .def("IsFiltered", &casbin::FileAdapter::IsFiltered, "IsFiltered returns true if the loaded policy has been filtered.");
+}
+
+void bindPyBatchFileAdapter(py::module &m) {
+    // Batch Adapter is virtual interface, maybe don't expose its' interface is ok.
+    py::class_<casbin::BatchFileAdapter, casbin::BatchAdapter, casbin::FileAdapter, std::shared_ptr<casbin::BatchFileAdapter>>(m, "BatchFileAdapter")
+        .def(py::init<std::string>(), "")
+        .def_static("NewBatchFileAdapter", &casbin::BatchFileAdapter::NewBatchFileAdapter, "")
+        .def("AddPolicies", &casbin::BatchFileAdapter::AddPolicies, "")
+        .def("RemovePolicies", &casbin::BatchFileAdapter::RemovePolicies, "");
+}
+
+void bindPyAdapter(py::module& m) {
+    bindPyBaseAdapter(m);
+    bindPyBatchAdapter(m);
+    bindPyFileAdapter(m);
+    bindPyBatchFileAdapter(m);
+}

bindings/python/py_casbin.h

@@ -24,3 +24,4 @@ void bindABACData(py::module &m);
 void bindPyModel(py::module &m);
 void bindPyConfig(py::module &m);
 void bindPySyncedEnforcer(py::module& m);
+void bindPyAdapter(py::module& m);

casbin/persist/file_adapter/batch_file_adapter.cpp

@@ -13,6 +13,10 @@ namespace casbin {
 BatchFileAdapter :: BatchFileAdapter(std::string file_path): FileAdapter(file_path) {
 }
 
+std::shared_ptr<BatchFileAdapter> BatchFileAdapter :: NewBatchFileAdapter(std::string file_path) {
+    return std::make_shared<BatchFileAdapter>(file_path);
+}
+
 void BatchFileAdapter :: AddPolicies(std::string sec, std::string p_type, std::vector<std::vector<std::string>> rules) {
     throw UnsupportedOperationException("not implemented hello");
 }

casbin/persist/file_adapter/batch_file_adapter.h

@@ -12,6 +12,8 @@ class BatchFileAdapter: public BatchAdapter, public FileAdapter {
         // NewAdapter is the constructor for Adapter.
         BatchFileAdapter(std::string file_path);
 
+        static std::shared_ptr<BatchFileAdapter> NewBatchFileAdapter(std::string file_path);
+
         void AddPolicies(std::string sec, std::string p_type, std::vector<std::vector<std::string>> rules);
 
         void RemovePolicies(std::string sec, std::string p_type, std::vector<std::vector<std::string>> rules);

casbin/persist/file_adapter/file_adapter.cpp

@@ -20,6 +20,10 @@ FileAdapter :: FileAdapter(std::string file_path) {
     this->filtered = false;
 }
 
+std::shared_ptr<casbin::FileAdapter> FileAdapter::NewFileAdapter(std::string file_path) {
+    return std::make_shared<FileAdapter>(file_path);
+}
+
 // LoadPolicy loads all policy rules from the storage.
 void FileAdapter :: LoadPolicy(const std::shared_ptr<Model>& model) {
     if (this->file_path == "")
@@ -36,15 +40,15 @@ void FileAdapter :: SavePolicy(const std::shared_ptr<Model>& model) {
 
     std::string tmp;
 
-    for (std::unordered_map<std::string, std::shared_ptr<Assertion>> :: iterator it = model->m["p"].assertion_map.begin() ; it != model->m["p"].assertion_map.begin() ; it++){
+    for (std::unordered_map<std::string, std::shared_ptr<Assertion>> :: iterator it = model->m["p"].assertion_map.begin() ; it != model->m["p"].assertion_map.end() ; it++){
         for (int i = 0 ; i < it->second->policy.size() ; i++){
             tmp += it->first + ", ";
             tmp += ArrayToString(it->second->policy[i]);
             tmp += "\n";
         }
     }
 
-    for (std::unordered_map <std::string, std::shared_ptr<Assertion>> :: iterator it = model->m["g"].assertion_map.begin() ; it != model->m["g"].assertion_map.begin() ; it++){
+    for (std::unordered_map <std::string, std::shared_ptr<Assertion>> :: iterator it = model->m["g"].assertion_map.begin() ; it != model->m["g"].assertion_map.end() ; it++){
         for (int i = 0 ; i < it->second->policy.size() ; i++){
             tmp += it->first + ", ";
             tmp += ArrayToString(it->second->policy[i]);
@@ -74,14 +78,18 @@ void FileAdapter :: LoadPolicyFile(const std::shared_ptr<Model>& model, std::fun
 
 void FileAdapter :: SavePolicyFile(std::string text) {
     std::ofstream out_file;
-    out_file.open(this->file_path, std::ios::out);
+
     try {
         out_file.open(this->file_path, std::ios::out);
     } catch (const std::ifstream::failure e) {
         throw IOException("Cannot open file.");
     }
 
-    out_file<<text;
+    if (out_file.is_open() == false) {
+        throw IOException("Don't exit adapter file");
+    }
+
+    out_file << text;
 
     out_file.close();
 }

casbin/persist/file_adapter/file_adapter.h

@@ -13,6 +13,8 @@ class FileAdapter : virtual public Adapter {
         // NewAdapter is the constructor for Adapter.
         FileAdapter(std::string file_path);
 
+        static std::shared_ptr<FileAdapter> NewFileAdapter(std::string file_path);
+
         // LoadPolicy loads all policy rules from the storage.
         void LoadPolicy(const std::shared_ptr<Model>& model);
 

casbin/util/array_to_string.cpp

@@ -25,10 +25,10 @@
 namespace casbin {
 
 std::string ArrayToString(const std::vector<std::string>& arr){
-    std::string res = arr[0];
+    std::string res = "";
     for (const std::string& it : arr)
         res += ", " + it;
-    return res;
+    return res.substr(2);
 }
 
 } // namespace casbin

include/casbin/casbin_helpers.h

@@ -434,6 +434,8 @@ namespace casbin {
         // NewAdapter is the constructor for Adapter.
         FileAdapter(std::string file_path);
 
+        static std::shared_ptr<FileAdapter> NewFileAdapter(std::string file_path);
+
         // LoadPolicy loads all policy rules from the storage.
         void LoadPolicy(const std::shared_ptr<Model>& model);
 
@@ -463,6 +465,8 @@ namespace casbin {
         // NewAdapter is the constructor for Adapter.
         BatchFileAdapter(std::string file_path);
 
+        static std::shared_ptr<BatchFileAdapter> NewBatchFileAdapter(std::string file_path);
+
         void AddPolicies(std::string sec, std::string p_type, std::vector<std::vector<std::string>> rules);
 
         void RemovePolicies(std::string sec, std::string p_type, std::vector<std::vector<std::string>> rules);