actually validate

server/src/controllers/video-stream.controller.ts

@@ -1,6 +1,7 @@
 import { Controller, Delete, Get, Header, Headers, HttpCode, HttpStatus, Next, Param, Res } from '@nestjs/common';
 import { ApiProduces, ApiTags } from '@nestjs/swagger';
 import { NextFunction, Response } from 'express';
+import { ZodValidationException } from 'nestjs-zod';
 import { HLS_PLAYLIST_CONTENT_TYPE } from 'src/constants';
 import { Endpoint, HistoryBuilder } from 'src/decorators';
 import { AuthDto } from 'src/dtos/auth.dto';
@@ -64,14 +65,19 @@ export class VideoStreamController {
   async getSegment(
     @Auth() auth: AuthDto,
     @Param() { id, sessionId, variantIndex, filename }: HlsSegmentParamDto,
-    @Headers() { [ImmichHeader.HlsTargetSegment]: targetSegment }: HlsSegmentHeaderDto,
+    @Headers() headers: HlsSegmentHeaderDto,
     @Res() res: Response,
     @Next() next: NextFunction,
   ) {
+    try {
+      headers = HlsSegmentHeaderDto.create(headers);
+    } catch (err) {
+      throw new ZodValidationException(err);
+    }
     await sendFile(
       res,
       next,
-      () => this.service.getSegment(auth, id, sessionId, variantIndex, filename, targetSegment),
+      () => this.service.getSegment(auth, id, sessionId, variantIndex, filename, headers[ImmichHeader.HlsInitSegment]),
       this.logger,
     );
   }

server/src/dtos/streaming.dto.ts

@@ -28,7 +28,7 @@ export class HlsSegmentParamDto extends createZodDto(HlsSegmentParamSchema) {}
 
 const HlsSegmentHeaderSchema = z.object({
   // Lets the client hint at which segment will be loaded after init.mp4.
-  [ImmichHeader.HlsTargetSegment]: z.coerce.number().int().min(0).optional(),
+  [ImmichHeader.HlsInitSegment]: z.coerce.number().int().min(0).optional(),
 });
 
 export class HlsSegmentHeaderDto extends createZodDto(HlsSegmentHeaderSchema) {}

server/src/enum.ts

@@ -24,7 +24,7 @@ export enum ImmichHeader {
   SharedLinkSlug = 'x-immich-share-slug',
   Checksum = 'x-immich-checksum',
   CorrelationId = 'X-Correlation-ID',
-  HlsTargetSegment = 'x-immich-hls-msn',
+  HlsInitSegment = 'x-immich-hls-msn',
 }
 
 export enum ImmichQuery {