Get the file type from NsDraggingInfo's draggingPasteboard

check_filetype.swift

    func checkFileType(sender: NSDraggingInfo) -> Bool {
        let pasteboard = sender.draggingPasteboard()

        // Iterate over accepted types of currently selected Workflow in its order of preference
        // Return as soon as a present type of the dropped item matches an accepted type of the Workflow
        for acceptedType in Workflows.activeAccepts {
            
            if String(acceptedType) == "filename" {
                if pasteboard.types?.contains("public.file-url") == true {
                    // File URLs from Finder (files, folders, drives)
                    // XCode (file)
                    // Mail (email)
                    log.debug("Returning: filename")
                    return true
                }

            } else if acceptedType == "url" {
                if pasteboard.types?.contains("public.url-name") == true ||
                    pasteboard.types?.contains("public.url") == true {
                    // Safari (image)
                    // Safari (url icon from adress bar)
                    // Safari (link)
                    // Vox (playlist item)
                    // iTunes (album, song)
                    // Mail (email)
                    // Calendar (item)
                    log.debug("Returning: url")
                    return false
                }

            } else if acceptedType == "image" {
                if pasteboard.types?.contains("public.image") == true ||
                    pasteboard.types?.contains("public.tiff") == true ||
                    pasteboard.types?.contains("public.fax") == true ||
                    pasteboard.types?.contains("public.jpeg") == true ||
                    pasteboard.types?.contains("public.jpeg-2000") == true ||
                    pasteboard.types?.contains("public.camera-raw-image") == true ||
                    pasteboard.types?.contains("public.png") == true ||
                    pasteboard.types?.contains("public.xbitmap-image") == true ||
                    pasteboard.types?.contains("com.apple.macpaint-image") == true ||
                    pasteboard.types?.contains("com.apple.pict") == true ||
                    pasteboard.types?.contains("com.apple.quicktime-image") == true ||
                    pasteboard.types?.contains("com.apple.icns") == true ||
                    pasteboard.types?.contains("com.adobe.photoshop-​image") == true ||
                    pasteboard.types?.contains("com.adobe.illustrator.ai-​image") == true ||
                    pasteboard.types?.contains("com.compuserve.gif") == true ||
                    pasteboard.types?.contains("com.microsoft.bmp") == true ||
                    pasteboard.types?.contains("com.microsoft.ico") == true ||
                    pasteboard.types?.contains("com.truevision.tga-image") == true ||
                    pasteboard.types?.contains("com.sgi.sgi-image") == true ||
                    pasteboard.types?.contains("com.ilm.openexr-image") == true ||
                    pasteboard.types?.contains("com.kodak.flashpix.image") == true {
                    // Safari (image) [tiff, nothing else ever seen]
                    log.debug("Returning: image")
                    return false
                }
                
            } else if acceptedType == "plaintext" {
                if pasteboard.types?.contains("public.plain-text") == true ||
                    pasteboard.types?.contains("public.source-code") == true ||
                    pasteboard.types?.contains("public.xml") == true ||
                    pasteboard.types?.contains("public.utf8-plain-text") == true ||
                    pasteboard.types?.contains("public.utf16-plain-text") == true ||
                    pasteboard.types?.contains("public.utf16-external-plain-text") == true {
                    // Sublime Text
                    // XCode (code)
                    // Safari (image)
                    // Safari (link)
                    // Safari (text)
                    // iTerm (text)
                    // Mail (email)
                    // Mail (content)
                    // Calendar (item)
                    
                    // MacVim, VS Code and Atom don't support dragging from them
                    log.debug("Returning: plaintext")
                    return false
                }
                
            } else if acceptedType == "richtext" {
                if pasteboard.types?.contains("public.rtf") == true ||
                    pasteboard.types?.contains("public.html") == true {
                    // TextEdit
                    // XCode (code)
                    // Safari (text)
                    // Mail (content)
                    log.debug("Returning: richtext")
                    return false
                }
    
            }
        }
        log.debug("Workflow doesn't accept any types of the dropped item, just \(Workflows.activeAccepts).")
        return false

    }