gistfile1.js

DocumentViewer.SUPPORTED_MIMETYPE_MAP = {
    office: [
        'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
        'application/vnd.ms-word.document.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
        'application/vnd.ms-word.template.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        'application/vnd.ms-excel.sheet.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
        'application/vnd.ms-excel.template.macroenabled.12',
        'application/vnd.ms-excel.sheet.binary.macroenabled.12',
        'application/vnd.ms-excel.addin.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.presentationml.presentation',
        'application/vnd.ms-powerpoint.presentation.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
        'application/vnd.ms-powerpoint.slideshow.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.presentationml.template',
        'application/vnd.ms-powerpoint.template.macroenabled.12',
        'application/vnd.ms-powerpoint.addin.macroenabled.12',
        'application/vnd.openxmlformats-officedocument.presentationml.slide',
        'application/vnd.ms-powerpoint.slide.macroenabled.12',
        'application/msonenote',
        'application/vnd.ms-officetheme'
    ],
    pdf: [
        'application/acrobat',
        'application/x-pdf',
        'applications/vnd.pdf',
        'text/pdf',
        'text/x-pdf',
        'application/pdf'
    ]
};

// Traverse our supported mime types and return the mimegroup type as stirng 'office' or 'pdf'
// If not supported mimetype, return undefined
return  _.object(_.flatten(_.map(DocumentViewer.SUPPORTED_MIMETYPE_MAP, function (mimetypes, filetype) {
    return _.map(mimetypes, function(mimetype) {
        return [mimetype, filetype];
    });
}), true))[instance.metadata.mimetype];