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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | 1x 1x 1x 1x 1x | import {
globalInterceptor,
Interceptor,
InvocationContext,
InvocationResult,
Provider,
ValueOrPromise,
} from '@loopback/core';
import { HttpErrors } from '@loopback/rest';
/**
* https://www.postgresql.org/docs/9.1/datatype-numeric.html
*/
export const MIN_ID_VALUE = 0;
export const MAX_ID_VALUE = 2147483647;
/**
* This class will be bound to the application as an `Interceptor` during
* `boot`
*/
@globalInterceptor('', { tags: { name: 'ensureIDValid' } })
export class EnsureIDValidInterceptor implements Provider<Interceptor> {
/*
constructor() {}
*/
/**
* This method is used by LoopBack context to produce an interceptor function
* for the binding.
*
* @returns An interceptor function
*/
value() {
return this.intercept.bind(this);
}
/**
* The logic to intercept an invocation
* @param invocationCtx - Invocation context
* @param next - A function to invoke next interceptor or the target method
*/
async intercept(
invocationCtx: InvocationContext,
next: () => ValueOrPromise<InvocationResult>,
) {
if (invocationCtx.methodName.startsWith('update')) {
const id = invocationCtx.args[0];
if (
typeof id === 'number' &&
(id < MIN_ID_VALUE || id > MAX_ID_VALUE)
) {
throw new HttpErrors.BadRequest(`Invalid id ${id}`);
}
}
// Add pre-invocation logic here
return next();
}
}
|