csv-metadata-quality-web/csv_metadata_quality_web/main.py

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import os
import subprocess
from base64 import b64decode, b64encode
from ansi2html import Ansi2HTMLConverter
from csv_metadata_quality.version import VERSION as cli_version
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from flask import (
Flask,
abort,
redirect,
render_template,
request,
send_from_directory,
url_for,
)
from werkzeug.utils import secure_filename
app = application = Flask(__name__)
app.config["MAX_CONTENT_LENGTH"] = 1024 * 1024
app.config["UPLOAD_EXTENSIONS"] = [".csv"]
# the only place we can write to on Google App Engine is /tmp
# see: https://cloud.google.com/appengine/docs/standard/python3/using-temp-files
app.config["UPLOAD_PATH"] = "/tmp"
@app.route("/")
def index():
return render_template("index.html", cli_version=cli_version)
@app.route("/", methods=["POST"])
def process():
uploaded_file = request.files["file"]
filename = secure_filename(uploaded_file.filename)
if filename != "":
file_ext = os.path.splitext(filename)[1]
if file_ext not in app.config["UPLOAD_EXTENSIONS"]:
abort(400)
uploaded_file.save(os.path.join(app.config["UPLOAD_PATH"], filename))
# generate a base64 representation of the filename to use as a slug
base64name = b64encode(filename.encode("ascii"))
# do we need to use secure_filename again here?
input_file = os.path.join(app.config["UPLOAD_PATH"], filename)
# write output file with the same name as the input file plus "-cleaned"
output_file = os.path.join(
app.config["UPLOAD_PATH"], os.path.splitext(filename)[0] + "-cleaned.csv"
)
args = ["-i", input_file, "-o", output_file]
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if "excludeCheckbox" in request.form:
if "excludeText" in request.form:
args.append("-x")
args.append(request.form["excludeText"])
if "agrovocCheckbox" in request.form:
if "agrovocText" in request.form:
args.append("-a")
args.append(request.form["agrovocText"])
if "unsafe" in request.form:
args.append("-u")
if "experimental" in request.form:
args.append("-e")
# Set cache dir to our upload path so we can tell csv-metadata-quality
# to store its requests-cache database there instead of in the current
# working directory (we can only write to /tmp on Google App Engine).
# Also, make sure to keep our PATH!
env = {
"REQUESTS_CACHE_DIR": app.config["UPLOAD_PATH"],
"PATH": os.environ["PATH"],
}
# run subprocess and capture output as UTF-8 so we get a string instead of
# bytes for ansi2html
results = subprocess.run(
["csv-metadata-quality"] + args,
capture_output=True,
encoding="UTF-8",
env=env,
)
# convert the output to HTML using ansi2html
conv = Ansi2HTMLConverter()
stdout_html = conv.convert(results.stdout)
# render the results to HTML so we can save them for later and allowing
# the user to share the results page without posting the file again. We
# decode base64name before sending it to convert it from bytes to str.
results_html = render_template(
"result.html",
cli_version=cli_version,
filename=filename,
stdout=stdout_html,
base64name=base64name.decode("ascii"),
)
# save results to a file so it's easy to have a saved results page when
# we don't know the options a user used to POST the form.
results_html_file = os.path.join(
app.config["UPLOAD_PATH"], base64name.decode("ascii")
)
with open(results_html_file, "w") as fh:
fh.write(results_html)
return redirect(url_for("results", base64slug=base64name))
return "No file selected"
@app.route("/result/<base64slug>")
def results(base64slug):
results_html_file = os.path.join(app.config["UPLOAD_PATH"], base64slug)
with open(results_html_file, "r") as fh:
results_html = fh.read()
return results_html
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@app.route("/result/<base64slug>/download")
def result_download(base64slug):
filename = b64decode(base64slug).decode("ascii")
filename = secure_filename(os.path.splitext(filename)[0] + "-cleaned.csv")
return send_from_directory(app.config["UPLOAD_PATH"], filename, as_attachment=True)