refactor: enhance permission handling and introduce new Permission and Policy classes

- Updated the `Guard` class to improve permission checking by utilizing the new `Permission` class.
- Refactored tests in `authorize.spec.ts` to use `Permission` instances instead of strings for better type safety.
- Introduced a new `permissions.spec.ts` file to test the functionality of the `Permission` and `Policy` classes.
- Enhanced the `recursivelyReplacePlaceholders` utility function to support various object structures and types.
- Updated middleware and controller files to align with the new permission handling structure.

app/__test__/auth/authorize/authorize.spec.ts

@@ -1,7 +1,11 @@
 import { describe, expect, test } from "bun:test";
-import { Guard } from "../../../src/auth/authorize/Guard";
+import { Guard } from "auth/authorize/Guard";
+import { Permission } from "core/security/Permission";
 
 describe("authorize", () => {
+   const read = new Permission("read");
+   const write = new Permission("write");
+
    test("basic", async () => {
       const guard = Guard.create(
          ["read", "write"],
@@ -16,10 +20,10 @@ describe("authorize", () => {
          role: "admin",
       };
 
-      expect(guard.granted("read", user)).toBe(true);
-      expect(guard.granted("write", user)).toBe(true);
+      expect(guard.granted(read, user)).toBe(true);
+      expect(guard.granted(write, user)).toBe(true);
 
-      expect(() => guard.granted("something")).toThrow();
+      expect(() => guard.granted(new Permission("something"))).toThrow();
    });
 
    test("with default", async () => {
@@ -37,22 +41,22 @@ describe("authorize", () => {
          { enabled: true },
       );
 
-      expect(guard.granted("read")).toBe(true);
-      expect(guard.granted("write")).toBe(false);
+      expect(guard.granted(read)).toBe(true);
+      expect(guard.granted(write)).toBe(false);
 
       const user = {
          role: "admin",
       };
 
-      expect(guard.granted("read", user)).toBe(true);
-      expect(guard.granted("write", user)).toBe(true);
+      expect(guard.granted(read, user)).toBe(true);
+      expect(guard.granted(write, user)).toBe(true);
    });
 
    test("guard implicit allow", async () => {
       const guard = Guard.create([], {}, { enabled: false });
 
-      expect(guard.granted("read")).toBe(true);
-      expect(guard.granted("write")).toBe(true);
+      expect(guard.granted(read)).toBe(true);
+      expect(guard.granted(write)).toBe(true);
    });
 
    test("role implicit allow", async () => {
@@ -66,8 +70,8 @@ describe("authorize", () => {
          role: "admin",
       };
 
-      expect(guard.granted("read", user)).toBe(true);
-      expect(guard.granted("write", user)).toBe(true);
+      expect(guard.granted(read, user)).toBe(true);
+      expect(guard.granted(write, user)).toBe(true);
    });
 
    test("guard with guest role implicit allow", async () => {
@@ -79,7 +83,7 @@ describe("authorize", () => {
       });
 
       expect(guard.getUserRole()?.name).toBe("guest");
-      expect(guard.granted("read")).toBe(true);
-      expect(guard.granted("write")).toBe(true);
+      expect(guard.granted(read)).toBe(true);
+      expect(guard.granted(write)).toBe(true);
    });
 });

app/__test__/auth/authorize/permissions.spec.ts

@@ -0,0 +1,93 @@
+import { describe, it, expect } from "bun:test";
+import { s } from "bknd/utils";
+import { Permission, Policy } from "core/security/Permission";
+
+describe("Permission", () => {
+   it("works with minimal schema", () => {
+      expect(() => new Permission("test")).not.toThrow();
+   });
+
+   it("parses context", () => {
+      const p = new Permission(
+         "test3",
+         {
+            filterable: true,
+         },
+         s.object({
+            a: s.string(),
+         }),
+      );
+
+      // @ts-expect-error
+      expect(() => p.parseContext({ a: [] })).toThrow();
+      expect(p.parseContext({ a: "test" })).toEqual({ a: "test" });
+      // @ts-expect-error
+      expect(p.parseContext({ a: 1 })).toEqual({ a: "1" });
+   });
+});
+
+describe("Policy", () => {
+   it("works with minimal schema", () => {
+      expect(() => new Policy().toJSON()).not.toThrow();
+   });
+
+   it("checks condition", () => {
+      const p = new Policy({
+         condition: {
+            a: 1,
+         },
+      });
+
+      expect(p.meetsCondition({ a: 1 })).toBe(true);
+      expect(p.meetsCondition({ a: 2 })).toBe(false);
+      expect(p.meetsCondition({ a: 1, b: 1 })).toBe(true);
+      expect(p.meetsCondition({})).toBe(false);
+
+      const p2 = new Policy({
+         condition: {
+            a: { $gt: 1 },
+            $or: {
+               b: { $lt: 2 },
+            },
+         },
+      });
+
+      expect(p2.meetsCondition({ a: 2 })).toBe(true);
+      expect(p2.meetsCondition({ a: 1 })).toBe(false);
+      expect(p2.meetsCondition({ a: 1, b: 1 })).toBe(true);
+   });
+
+   it("filters", () => {
+      const p = new Policy({
+         filter: {
+            age: { $gt: 18 },
+         },
+      });
+      const subjects = [{ age: 19 }, { age: 17 }, { age: 12 }];
+
+      expect(p.getFiltered(subjects)).toEqual([{ age: 19 }]);
+
+      expect(p.meetsFilter({ age: 19 })).toBe(true);
+      expect(p.meetsFilter({ age: 17 })).toBe(false);
+      expect(p.meetsFilter({ age: 12 })).toBe(false);
+   });
+
+   it("replaces placeholders", () => {
+      const p = new Policy({
+         condition: {
+            a: "@auth.username",
+         },
+         filter: {
+            a: "@auth.username",
+         },
+      });
+      const vars = { auth: { username: "test" } };
+
+      expect(p.meetsCondition({ a: "test" }, vars)).toBe(true);
+      expect(p.meetsCondition({ a: "test2" }, vars)).toBe(false);
+      expect(p.meetsCondition({ a: "test2" })).toBe(false);
+      expect(p.meetsFilter({ a: "test" }, vars)).toBe(true);
+      expect(p.meetsFilter({ a: "test2" }, vars)).toBe(false);
+      expect(p.meetsFilter({ a: "test2" })).toBe(false);
+   });
+});

app/__test__/core/utils.spec.ts

@@ -194,6 +194,116 @@ describe("Core Utils", async () => {
             expect(result).toEqual(expected);
          }
       });
+
+      test("recursivelyReplacePlaceholders", () => {
+         // test basic replacement with simple pattern
+         const obj1 = { a: "Hello, {$name}!", b: { c: "Hello, {$name}!" } };
+         const variables1 = { name: "John" };
+         const result1 = utils.recursivelyReplacePlaceholders(obj1, /\{\$(\w+)\}/g, variables1);
+         expect(result1).toEqual({ a: "Hello, John!", b: { c: "Hello, John!" } });
+
+         // test the specific example from the user request
+         const obj2 = { some: "value", here: "@auth.user" };
+         const variables2 = { auth: { user: "what" } };
+         const result2 = utils.recursivelyReplacePlaceholders(obj2, /^@([a-z\.]+)$/, variables2);
+         expect(result2).toEqual({ some: "value", here: "what" });
+
+         // test with arrays
+         const obj3 = { items: ["@config.name", "static", "@config.version"] };
+         const variables3 = { config: { name: "MyApp", version: "1.0.0" } };
+         const result3 = utils.recursivelyReplacePlaceholders(obj3, /^@([a-z\.]+)$/, variables3);
+         expect(result3).toEqual({ items: ["MyApp", "static", "1.0.0"] });
+
+         // test with nested objects and deep paths
+         const obj4 = {
+            user: "@auth.user.name",
+            settings: {
+               theme: "@ui.theme",
+               nested: {
+                  value: "@deep.nested.value",
+               },
+            },
+         };
+         const variables4 = {
+            auth: { user: { name: "Alice" } },
+            ui: { theme: "dark" },
+            deep: { nested: { value: "found" } },
+         };
+         const result4 = utils.recursivelyReplacePlaceholders(obj4, /^@([a-z\.]+)$/, variables4);
+         expect(result4).toEqual({
+            user: "Alice",
+            settings: {
+               theme: "dark",
+               nested: {
+                  value: "found",
+               },
+            },
+         });
+
+         // test with missing paths (should return original match)
+         const obj5 = { value: "@missing.path" };
+         const variables5 = { existing: "value" };
+         const result5 = utils.recursivelyReplacePlaceholders(obj5, /^@([a-z\.]+)$/, variables5);
+         expect(result5).toEqual({ value: "@missing.path" });
+
+         // test with non-matching strings (should remain unchanged)
+         const obj6 = { value: "normal string", other: "not@matching" };
+         const variables6 = { some: "value" };
+         const result6 = utils.recursivelyReplacePlaceholders(obj6, /^@([a-z\.]+)$/, variables6);
+         expect(result6).toEqual({ value: "normal string", other: "not@matching" });
+
+         // test with primitive values (should handle gracefully)
+         expect(
+            utils.recursivelyReplacePlaceholders("@test.value", /^@([a-z\.]+)$/, {
+               test: { value: "replaced" },
+            }),
+         ).toBe("replaced");
+         expect(utils.recursivelyReplacePlaceholders(123, /^@([a-z\.]+)$/, {})).toBe(123);
+         expect(utils.recursivelyReplacePlaceholders(null, /^@([a-z\.]+)$/, {})).toBe(null);
+
+         // test type preservation for full string matches
+         const variables7 = { test: { value: 123, flag: true, data: null, arr: [1, 2, 3] } };
+         const result7 = utils.recursivelyReplacePlaceholders(
+            {
+               number: "@test.value",
+               boolean: "@test.flag",
+               nullValue: "@test.data",
+               array: "@test.arr",
+            },
+            /^@([a-z\.]+)$/,
+            variables7,
+         );
+         expect(result7).toEqual({
+            number: 123,
+            boolean: true,
+            nullValue: null,
+            array: [1, 2, 3],
+         });
+
+         // test partial string replacement (should convert to string)
+         const result8 = utils.recursivelyReplacePlaceholders(
+            { message: "The value is @test.value!" },
+            /@([a-z\.]+)/g,
+            variables7,
+         );
+         expect(result8).toEqual({ message: "The value is 123!" });
+
+         // test mixed scenarios
+         const result9 = utils.recursivelyReplacePlaceholders(
+            {
+               fullMatch: "@test.value", // should preserve number type
+               partialMatch: "Value: @test.value", // should convert to string
+               noMatch: "static text",
+            },
+            /^@([a-z\.]+)$/,
+            variables7,
+         );
+         expect(result9).toEqual({
+            fullMatch: 123, // number preserved
+            partialMatch: "Value: @test.value", // no replacement (pattern requires full match)
+            noMatch: "static text",
+         });
+      });
    });
 
    describe("file", async () => {