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class Api::UploadsController < ApiController | |
def create | |
@upload = Upload.new(upload_params) | |
ensure | |
clean_tempfile | |
end | |
private | |
def upload_params | |
the_params = params.require(:upload).permit(:file) | |
the_params[:file] = parse_image_data(the_params[:file]) if the_params[:file] | |
the_params | |
end | |
def parse_image_data(base64_image) | |
filename = "upload-image" | |
in_content_type, encoding, string = base64_image.split(/[:;,]/)[1..3] | |
@tempfile = Tempfile.new(filename) | |
@tempfile.binmode | |
@tempfile.write Base64.decode64(string) | |
@tempfile.rewind | |
# for security we want the actual content type, not just what was passed in | |
content_type = `file --mime -b #{@tempfile.path}`.split(";")[0] | |
# we will also add the extension ourselves based on the above | |
# if it's not gif/jpeg/png, it will fail the validation in the upload model | |
extension = content_type.match(/gif|jpeg|png/).to_s | |
filename += ".#{extension}" if extension | |
ActionDispatch::Http::UploadedFile.new({ | |
tempfile: @tempfile, | |
content_type: content_type, | |
filename: filename | |
}) | |
end | |
def clean_tempfile | |
if @tempfile | |
@tempfile.close | |
@tempfile.unlink | |
end | |
end | |
end |
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