diff --git a/src/common/decorators/roles.decorator.ts b/src/common/decorators/roles.decorator.ts
new file mode 100644
index 0000000..b1efe4b
--- /dev/null
+++ b/src/common/decorators/roles.decorator.ts
@@ -0,0 +1,3 @@
+import { SetMetadata } from "@nestjs/common";
+
+export const Roles = (...roles: string[]) => SetMetadata("roles", roles);
diff --git a/src/common/decorators/user.decorator.ts b/src/common/decorators/user.decorator.ts
new file mode 100644
index 0000000..efbca73
--- /dev/null
+++ b/src/common/decorators/user.decorator.ts
@@ -0,0 +1,7 @@
+import { createParamDecorator, ExecutionContext } from "@nestjs/common";
+
+export const User = createParamDecorator((data: string | undefined, ctx: ExecutionContext) => {
+  const request = ctx.switchToHttp().getRequest();
+  const user = request.user;
+  return data ? user?.[data] : user;
+});
diff --git a/src/common/dto/date_range_query.dto.ts b/src/common/dto/date_range_query.dto.ts
new file mode 100644
index 0000000..973e4aa
--- /dev/null
+++ b/src/common/dto/date_range_query.dto.ts
@@ -0,0 +1,11 @@
+import { IsDateString, IsOptional } from "class-validator";
+
+export class DateRangeQueryDto {
+    @IsOptional()
+    @IsDateString()
+    start?: string;
+
+    @IsOptional()
+    @IsDateString()
+    end?: string;
+}
diff --git a/src/common/dto/id_param.dto.ts b/src/common/dto/id_param.dto.ts
new file mode 100644
index 0000000..f632953
--- /dev/null
+++ b/src/common/dto/id_param.dto.ts
@@ -0,0 +1,6 @@
+import { IsUUID } from "class-validator";
+
+export class IdParamDto {
+    @IsUUID()
+    id: string;
+}
diff --git a/src/common/dto/pagination.query.ts b/src/common/dto/pagination.query.ts
new file mode 100644
index 0000000..371e358
--- /dev/null
+++ b/src/common/dto/pagination.query.ts
@@ -0,0 +1,11 @@
+import { IsOptional, IsPositive } from "class-validator";
+
+export class PaginationQueryDto {
+    @IsOptional()
+    @IsPositive()
+    offset?: number;
+
+    @IsOptional()
+    @IsPositive()
+    limit?: number;
+}
\ No newline at end of file
diff --git a/src/common/dto/search_query.dto.ts b/src/common/dto/search_query.dto.ts
new file mode 100644
index 0000000..b256af1
--- /dev/null
+++ b/src/common/dto/search_query.dto.ts
@@ -0,0 +1,8 @@
+import { IsOptional, IsString, MinLength } from "class-validator";
+
+export class SearchQueryDto {
+    @IsOptional()
+    @IsString()
+    @MinLength(2)
+    q?: string;   
+}
diff --git a/src/common/guards/roles.guard.ts b/src/common/guards/roles.guard.ts
new file mode 100644
index 0000000..6df212e
--- /dev/null
+++ b/src/common/guards/roles.guard.ts
@@ -0,0 +1,21 @@
+import { CanActivate, ExecutionContext, Injectable } from "@nestjs/common";
+import { Reflector } from "@nestjs/core";
+import { Observable } from "rxjs";
+
+@Injectable()
+export class RolesGuard implements CanActivate {
+    constructor(private readonly reflector: Reflector) {}
+    canActivate(context: ExecutionContext): boolean | Promise<boolean> | Observable<boolean> {
+        const requiredRoles = this.reflector.get<string[]>('roles', context.getHandler());
+        if (!requiredRoles || requiredRoles.length === 0) {
+            return true; // Si aucun role est requis -> accès autorise
+        }
+
+        const request = context.switchToHttp().getRequest();
+        const user = request.user;
+        if (!user || !user.role) {
+            return false; // Si l'utilisateur est pas authentifie ou a pas de role -> accès refusé
+        }
+        return requiredRoles.includes(user.role);
+    }
+}
\ No newline at end of file