File Uploader (#5)

- Add a file uploader sample (7657e9d4891015119c5ae8b06f73ba8fa25ffab7)
- Add command line arguments such as `--server.enableXsrfProtection false` that are necessary or suitable for HF Spaces (1f5003f862ef166904510feb32676b55c5a5de2b)


Co-authored-by: Yuichiro Tachibana <whitphx@users.noreply.huggingface.co>

Dockerfile

@@ -20,4 +20,8 @@ WORKDIR $HOME/app
 COPY . $HOME/app
 
 EXPOSE 8501
-CMD streamlit run app.py
+CMD streamlit run app.py \
+    --server.headless true \
+    --server.enableCORS false \
+    --server.enableXsrfProtection false \
+    --server.fileWatcherType none

app.py

@@ -34,3 +34,9 @@ filtered_data = data[data[DATE_COLUMN].dt.hour == hour_to_filter]
 
 st.subheader('Map of all pickups at %s:00' % hour_to_filter)
 st.map(filtered_data)
+
+uploaded_file = st.file_uploader("Choose a file")
+if uploaded_file is not None:
+    st.write(uploaded_file.name)
+    bytes_data = uploaded_file.getvalue()
+    st.write(len(bytes_data), "bytes")