Scoped Branch - Rule Templates:

- Add rule templates for reusable access control rules
- Support template assignment to resources with automatic rule propagation
- Add template management UI
- Implement template rule protection on resource rules page

server/routers/ruleTemplate/unassignTemplateFromResource.ts

@@ -0,0 +1,130 @@
+import { Request, Response, NextFunction } from "express";
+import { z } from "zod";
+import { db } from "@server/db";
+import { resourceTemplates, resources, resourceRules, templateRules } from "@server/db";
+import { eq, and } from "drizzle-orm";
+import response from "@server/lib/response";
+import HttpCode from "@server/types/HttpCode";
+import createHttpError from "http-errors";
+import logger from "@server/logger";
+import { fromError } from "zod-validation-error";
+import { OpenAPITags, registry } from "@server/openApi";
+
+const unassignTemplateFromResourceParamsSchema = z
+    .object({
+        resourceId: z
+            .string()
+            .transform(Number)
+            .pipe(z.number().int().positive()),
+        templateId: z.string().min(1)
+    })
+    .strict();
+
+registry.registerPath({
+    method: "delete",
+    path: "/resource/{resourceId}/templates/{templateId}",
+    description: "Unassign a template from a resource.",
+    tags: [OpenAPITags.Resource, OpenAPITags.RuleTemplate],
+    request: {
+        params: unassignTemplateFromResourceParamsSchema
+    },
+    responses: {}
+});
+
+export async function unassignTemplateFromResource(
+    req: Request,
+    res: Response,
+    next: NextFunction
+): Promise<any> {
+    try {
+        const parsedParams = unassignTemplateFromResourceParamsSchema.safeParse(
+            req.params
+        );
+        if (!parsedParams.success) {
+            return next(
+                createHttpError(
+                    HttpCode.BAD_REQUEST,
+                    fromError(parsedParams.error).toString()
+                )
+            );
+        }
+
+        const { resourceId, templateId } = parsedParams.data;
+
+        // Verify that the referenced resource exists
+        const [resource] = await db
+            .select()
+            .from(resources)
+            .where(eq(resources.resourceId, resourceId))
+            .limit(1);
+
+        if (!resource) {
+            return next(
+                createHttpError(
+                    HttpCode.NOT_FOUND,
+                    `Resource with ID ${resourceId} not found`
+                )
+            );
+        }
+
+        // Check if the template is assigned to this resource
+        const [existingAssignment] = await db
+            .select()
+            .from(resourceTemplates)
+            .where(and(eq(resourceTemplates.resourceId, resourceId), eq(resourceTemplates.templateId, templateId)))
+            .limit(1);
+
+        if (!existingAssignment) {
+            return next(
+                createHttpError(
+                    HttpCode.NOT_FOUND,
+                    `Template ${templateId} is not assigned to resource ${resourceId}`
+                )
+            );
+        }
+
+        // Remove the template assignment
+        await db
+            .delete(resourceTemplates)
+            .where(and(eq(resourceTemplates.resourceId, resourceId), eq(resourceTemplates.templateId, templateId)));
+
+        // Remove all resource rules that were created from this template
+        // We can now use the templateRuleId to precisely identify which rules to remove
+        try {
+            // Get all template rules for this template
+            const templateRulesList = await db
+                .select()
+                .from(templateRules)
+                .where(eq(templateRules.templateId, templateId))
+                .orderBy(templateRules.priority);
+
+            if (templateRulesList.length > 0) {
+                // Remove resource rules that have templateRuleId matching any of the template rules
+                for (const templateRule of templateRulesList) {
+                    await db
+                        .delete(resourceRules)
+                        .where(and(
+                            eq(resourceRules.resourceId, resourceId),
+                            eq(resourceRules.templateRuleId, templateRule.ruleId)
+                        ));
+                }
+            }
+        } catch (error) {
+            logger.error("Error removing template rules during unassignment:", error);
+            // Don't fail the unassignment if rule removal fails, just log it
+        }
+
+        return response(res, {
+            data: { resourceId, templateId },
+            success: true,
+            error: false,
+            message: "Template unassigned from resource successfully",
+            status: HttpCode.OK
+        });
+    } catch (error) {
+        logger.error(error);
+        return next(
+            createHttpError(HttpCode.INTERNAL_SERVER_ERROR, "An error occurred")
+        );
+    }
+}