Merge pull request #9386 from ritzalam/validate-file-paths

...src/main/java/org/bigbluebutton/api/RecordingService.java

bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java

...bluebutton/presentation/DocumentConversionServiceImp.java

...uebutton/presentation/PresentationUrlDownloadService.java

.../org/bigbluebutton/presentation/UploadedPresentation.java

...luebutton/presentation/imp/PresentationFileProcessor.java

...rs/org/bigbluebutton/web/controllers/ApiController.groovy

...gbluebutton/web/controllers/PresentationController.groovy