Remove file immediately, if extension is not "PDF"

Question

HI All, 
 
 I am using a!fileUploadField for uploads file, which has validated to allow only "PDF" file, 
 Our ask is, if uploaded file extension is not PDF, shall remove immediately, how i can do that? 
 
 Note:- file upload feature i have given on a grid column and it's single select.

Harshit Bumb (Appyzie) · Accepted Answer

Use the below code then. 
 a!fileUploadField(
 label: "File Upload",
 labelPosition: "ABOVE",
 value: ri!document_doc,
 saveInto: {
 ri!document_doc,
 a!save(
 ri!document_doc,
 if(
 rule!TA_checkFileExtension(document_doc: ri!document_doc)="PDF",
 null,
 ri!document_doc
 )
 )
 },
 target: cons!DA_DESIGNER_DOCUMENTS,
 ) 
 TA_checkFileExtension - 
 tostring(
 a!fileUploadField(value: ri!document_doc).contents.value.extension
)

Mike Schmitt · Answer

I would urge you figure out a way to disable moving between tabs/pages when the validation has an error, implementing a form-level validation component for visibility. You could use the functionality Harshit and I suggest below to store into a local variable a flag that becomes "true" if any uploaded files have an invalid extension per your business rules. 
 I strongly suggest AGAINST simply clearing out the "value" of the File Upload Field if the uploaded document's extension is wrong, because the user experience will be exceptionally poor (they will simply see their uploaded file vanish with no explanation).

Mike Schmitt · Answer

This can be done by using the "content details" plug-in which can also access object properties by ID for freshly-uploaded files (though annoyingly the output is only plaintext so we must scrape the result). I've switched to that method for the times when it's truly necessary. 
 /* Parent Rule = UTIL_getNewUploadDocName */
a!localVariables(
 local!rawDetails: if(
 a!isNullOrEmpty(ri!doc),
 "",
 getcontentobjectdetailsbyid(ri!doc)
 ),
 local!wholeName: index(extract(
 local!rawDetails,
 "[Name: ",
 ", UUID:"
 ), 1, null()),

 rule!UTIL_processDocumentName(
 docName: local!wholeName
 )
) 
 /* Child Rule = UTIL_processDocumentName (uses RegEx plug-in) */
a!localVariables(
 local!hasNoExtension: search(".", ri!docName) = 0,
 
 local!namePart: if(
 local!hasNoExtension,
 ri!docName,
 regexsearch(
 pattern: ".*(?=\.)",
 searchString: ri!docName,
 regexFlags: "i"
 )[1].match
 ),
 
 local!extension: if(
 local!hasNoExtension,
 "",
 regexsearch(
 pattern: "[^\.]*$",
 searchString: ri!docName,
 regexFlags: "i"
 )[1].match
 ),
 
 a!map(
 name: local!namePart,
 extension: local!extension
 )
) 
 Result: 
 cc: please consider adopting this method instead of the unsupported component-hacking that was formerly required for this functionality, at least in terms of what we recommend to people around here

Remove file immediately, if extension is not "PDF"

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