Content-Type validation when no file is uploaded
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Key: WW-1911
URL: https://issues.apache.org/struts/browse/WW-1911
Project: Struts 2
Issue Type: Bug
Components: Dispatch, Interceptors
Affects Versions: 2.0.7, 2.0.6, 2.1.0, 2.1.x
Environment: FireFox 2.0; Tomcat 5.0; commons-fileupload 1.2
Reporter: Lukasz Racon
If you set allowed types on the file upload interceptor:
<param name="fileUpload.allowedTypes">image/png,image/gif,image/jpeg</param>
it will validate content type even though there is no file uploaded.
This shows up in two cases:
1) If field is required you will get 2 messages:
Content-Type not allowed: image "upload_1120a017_1125f7d74fc__8000_00000013.tmp" application/octet-stream
Image is required.
2) If field is not required you will get invalid content type validation error anyway (which
prohibits from executing the action):
Content-Type not allowed: image "upload_1120a017_1125f7d74fc__8000_00000013.tmp" application/octet-stream
Basically it violates the idea of single purpose validator (since it also acts as required
field validator).
There are at least 3 ways to fix it:
1) fix org.apache.struts2.interceptor.FileUploadInterceptor.acceptFile method so it does not
check content type (allowedTypesSet) if file is empty.
2) fix the ServletFileUpload.parseRequest so it does not show empty downloads (i.e. when file
name is null).
3) (one that is in patch) fix org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.parse
so it ignores files that have blank file name.
Attached patch fixes JakartaMultiPartRequest if file name is blank it means no file has been
uploaded.
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