Enable port to be overridden (#1527)

Enable port to be overriden

server/src/integrations/environment/decorators/__tests__/cast-to-positive-number.decorator.spec.ts

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+import { plainToClass } from 'class-transformer';
+
+import { CastToPositiveNumber } from 'src/integrations/environment/decorators/cast-to-positive-number.decorator';
+
+class TestClass {
+  @CastToPositiveNumber()
+  numberProperty?: any;
+}
+
+describe('CastToPositiveNumber Decorator', () => {
+  it('should cast number to number', () => {
+    const transformedClass = plainToClass(TestClass, { numberProperty: 123 });
+    expect(transformedClass.numberProperty).toBe(123);
+  });
+
+  it('should cast string to number', () => {
+    const transformedClass = plainToClass(TestClass, { numberProperty: '123' });
+    expect(transformedClass.numberProperty).toBe(123);
+  });
+
+  it('should cast null to undefined', () => {
+    const transformedClass = plainToClass(TestClass, { numberProperty: null });
+    expect(transformedClass.numberProperty).toBe(undefined);
+  });
+
+  it('should cast negative number to undefined', () => {
+    const transformedClass = plainToClass(TestClass, { numberProperty: -12 });
+    expect(transformedClass.numberProperty).toBe(undefined);
+  });
+
+  it('should cast undefined to undefined', () => {
+    const transformedClass = plainToClass(TestClass, {
+      numberProperty: undefined,
+    });
+    expect(transformedClass.numberProperty).toBe(undefined);
+  });
+
+  it('should cast NaN string to undefined', () => {
+    const transformedClass = plainToClass(TestClass, {
+      numberProperty: 'toto',
+    });
+    expect(transformedClass.numberProperty).toBe(undefined);
+  });
+
+  it('should cast a negative string to undefined', () => {
+    const transformedClass = plainToClass(TestClass, {
+      numberProperty: '-123',
+    });
+    expect(transformedClass.numberProperty).toBe(undefined);
+  });
+});

server/src/integrations/environment/decorators/cast-to-positive-number.decorator.ts

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+import { Transform } from 'class-transformer';
+
+export function CastToPositiveNumber() {
+  return Transform(({ value }: { value: string }) => toNumber(value));
+}
+
+const toNumber = (value: any) => {
+  if (typeof value === 'number') {
+    return value >= 0 ? value : undefined;
+  }
+  if (typeof value === 'string') {
+    return isNaN(+value) ? undefined : toNumber(+value);
+  }
+  return undefined;
+};