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Original file line number Diff line number Diff line change
Expand Up @@ -5,23 +5,57 @@ import {
NestInterceptor,
StreamableFile,
} from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import {
transformKeysFromCamelToSnake,
transformKeysFromSnakeToCamel,
} from '../utils/case-converter';

export const SkipSnakeCaseTransform = Reflector.createDecorator<
| {
// Either skip specified top-level body props or skip it entirely
body?: string[] | boolean;
query?: boolean;
response?: boolean;
}
| undefined
>({
key: 'skipSnakeCaseTransform',
});

@Injectable()
export class SnakeCaseInterceptor implements NestInterceptor {
constructor(private reflector: Reflector) {}

intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
const request = context.switchToHttp().getRequest();

if (request.body) {
request.body = transformKeysFromSnakeToCamel(request.body);
const skipTransformOptions = this.reflector.getAllAndOverride(
SkipSnakeCaseTransform,
[context.getHandler(), context.getClass()],
) || { body: false, query: false, response: false };

const shouldSkipBody = skipTransformOptions.body === true;
if (request.body && !shouldSkipBody) {
const transformed = transformKeysFromSnakeToCamel(request.body);

const skipBodyProps = Array.isArray(skipTransformOptions.body)
? skipTransformOptions.body
: [];
for (const prop of skipBodyProps) {
if (prop in request.body) {
// @ts-expect-error - 'transformed' is same type as 'request.body'
transformed[prop] = request.body[prop];
}
}

request.body = transformed;
}

if (request.query) {
const shouldSkipQuery = skipTransformOptions.query === true;
if (request.query && !shouldSkipQuery) {
const transformedQuery = transformKeysFromSnakeToCamel(request.query);
Object.defineProperty(request, 'query', {
value: transformedQuery,
Expand All @@ -33,9 +67,11 @@ export class SnakeCaseInterceptor implements NestInterceptor {

return next.handle().pipe(
map((data) => {
if (data instanceof StreamableFile) {
const shouldSkipResponse = skipTransformOptions.query === true;
if (data instanceof StreamableFile || shouldSkipResponse) {
return data;
}

return transformKeysFromCamelToSnake(data);
}),
);
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ import {
JobUnknownManifestDto,
} from './job.dto';
import { JobService } from './job.service';
import { SkipSnakeCaseTransform } from '../../common/interceptors/snake-case';

@ApiBearerAuth()
@UseGuards(JwtAuthGuard)
Expand Down Expand Up @@ -135,6 +136,7 @@ export class JobController {
'Endpoint to create a job using a manifest JSON body without validating its format.',
})
@ApiBody({ type: JobUnknownManifestDto })
@SkipSnakeCaseTransform({ body: ['manifest'] })
@ApiResponse({
status: 201,
description: 'ID of the created job.',
Expand Down
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