CN 2023-04-26

<!-- upload_interface.html -->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Upload file to local FS</title>
</head>
<body>
<form action="/upload"
      method="post"
      enctype="multipart/form-data"
>
    <label for="idFile">Pick the file to upload: </label>
    <input type="file"
           name="nameFile"
           id="idFile"
    ><!-- para seleção do ficheiro -->
    <br>
    <input type="submit"
           value="confirm file"
    ><!-- sinalizar ficheiro escolhido, iniciar upload -->
</form>
</body>
</html>

*****
# application.py
import os

from flask import Flask,\
                    request, \
                    render_template

from werkzeug.utils import \
                secure_filename


UPLOAD_ELEMENT = "nameFiles" # plural nesta v2

application = Flask(__name__)
application.config['UPLOAD_FOLDER']="dls"

@application.route("/", methods=['GET', 'POST'])
def root():
    return render_template("upload_interface.html")
# def root

@application.route("/upload", methods=['POST'])
def process_uploads():
    ret = "<ul>"
    upload_results = upload()
    if(
        upload_results!=False \
        and \
        type(upload_results)==dict \
    ):
        for src_fname in upload_results.keys():
            bOK = upload_results[src_fname]!=False
            if(bOK):
                dst:str=upload_results[src_fname]
                fb:str=f"File {src_fname} uploaded OK to {dst}"
            else:
                fb: str = f"Failed to upload file {src_fname}"
            # if-else

            ret+=f"<li>{fb}</li>"
        #for
        ret+="</ul>"
        return ret
    else:
        return upload_results # será um frase, neste caso
    # if-else
# def process_uploads

def upload():
    ret:dict = dict()

    # theFile = request.files[UPLOAD_ELEMENT] # single file
    theFiles = request.files.getlist(UPLOAD_ELEMENT)
    if(theFiles):
        for oFile in theFiles:
            src_fname = oFile.filename
            sec_fname = secure_filename(src_fname)

            prefix: str = os.path.join(
                application.root_path,
                application.config['UPLOAD_FOLDER']
            )
            if(sec_fname):
                dst_name = os.path.join(
                    prefix,
                    sec_fname
                )
                try:
                    oFile.save(
                        dst=dst_name
                    )
                    ret[src_fname]=dst_name
                except Exception as e:
                    ret[src_fname]=False
                # try-except
            # if got secure file name
        # for every uploaded file
    else:
        return f"Files not received."
    # if-else

    return ret
# def upload

if(__name__=='__main__'):
    application.run(
        #host
        #port
        debug=True
    )