Intruduced a new folder structure for action models

ref #76

src/models/actions/update/UpdatePermission.ts

@@ -0,0 +1,68 @@
+import { IsInt, IsNotEmpty, IsObject } from 'class-validator';
+import { getConnectionManager } from 'typeorm';
+import { PermissionNeedsPrincipalError } from '../../errors/PermissionErrors';
+import { PrincipalNotFoundError, PrincipalWrongTypeError } from '../../errors/PrincipalErrors';
+import { Permission } from '../entities/Permission';
+import { Principal } from '../entities/Principal';
+import { PermissionAction } from '../enums/PermissionAction';
+import { PermissionTarget } from '../enums/PermissionTargets';
+
+/**
+ * This class is used to update a Permission entity (via put request).
+ */
+export class UpdatePermission {
+
+    /**
+     * The updated permission's id.
+     * This shouldn't have changed but it is here in case anyone ever wants to enable id changes (whyever they would want to).
+     */
+    @IsInt()
+    id: number;
+
+    /**
+     * The updated permissions's principal.
+     * Just has to contain the principal's id -everything else won't be checked or changed.
+     */
+    @IsObject()
+    @IsNotEmpty()
+    principal: Principal;
+
+    /**
+     * The permissions's target.
+     */
+    @IsNotEmpty()
+    target: PermissionTarget;
+
+    /**
+     * The permissions's action.
+     */
+    @IsNotEmpty()
+    action: PermissionAction;
+
+    /**
+     * Updates a provided Permission entity based on this.
+     */
+    public async updatePermission(permission: Permission): Promise<Permission> {
+        permission.principal = await this.getPrincipal();
+        permission.target = this.target;
+        permission.action = this.action;
+
+        return permission;
+    }
+
+    /**
+     * Loads the updated permission's principal based on it's id.
+     */
+    public async getPrincipal(): Promise<Principal> {
+        if (this.principal === undefined || this.principal === null) {
+            throw new PermissionNeedsPrincipalError();
+        }
+        if (!isNaN(this.principal.id)) {
+            let principal = await getConnectionManager().get().getRepository(Principal).findOne({ id: this.principal.id });
+            if (!principal) { throw new PrincipalNotFoundError(); }
+            return principal;
+        }
+
+        throw new PrincipalWrongTypeError();
+    }
+}