File upload and processing

We can upload and process files with UploadHandler in Gramex:

HTML:

<form
  action="upload"
  method="POST"
  enctype="multipart/form-data"
  id="input-form"
>
  <legend>Gramex UploadHandler</legend>
  <div class="form-group">
    <input type="file" name="file" class="form-control" id="upload-files" />
  </div>
  <input type="hidden" name="save" value="your_preferred_name.csv" />
  <input type="hidden" name="_xsrf" value="{{ handler.xsrf_token }}" />
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

gramex.yaml:

project/upload:
  pattern: /$YAMLURL/upload
  handler: UploadHandler
  kwargs:
    path: $YAMLPATH/uploads/ # ... save files here
    methods: get
    redirect:
      query: next
      url: /$YAMLURL/

This will save the file as uploads/your_preferred_name.csv.

If you want to process the file post upload, add transform attribute to the kwargs section:

transform:
  function: app.process_file(content, handler)

then use process_file(content, handler) in app.py.

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