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Python3でCGIチャレンジ5　簡易ログイン機能

Posted at 2021-12-08

#作業フォルダ
ps5

#作業
html1つとpy1つ作成

##index.htmlの作成

index.html

<html>
<head><meta http-equiv="content-type" charset="UTF-8"></head>
<body>
  <form action="/cgi-bin/authentication.py" method="POST">
    ID:<input type="text" name="ID">
    PASS:<input type="text" name="PASS">
    <input type="submit" value="ログイン">
  </form>
</body>
</html>

##cgi-binフォルダの作成

##authentication.pyの作成。cgi-bin配下に作成。

authentication.py

import cgi
import cgitb
import csv
cgitb.enable()

print("Content-Type: text/html")
print()   

form = cgi.FieldStorage()
id = form['ID'].value
password = form['PASS'].value

file_name = "password.txt"
fieldnames = ['ID', 'PASS']
try:
  with open(file_name, 'r', encoding='UTF-8', newline="") as f:

    reader = csv.DictReader(f, delimiter=",", quotechar='"')
    for row in reader:
      if row['ID'] == id:
        if row['PASS'] == password:
          print('ログインしました')
          break
        else:
          print('パスワードが間違ってます')
          break
    else:
      d = {'ID': id, 'PASS': password}

      with open(file_name, 'a', encoding='UTF-8', newline="") as f2:
        writer = csv.DictWriter(f2, fieldnames=fieldnames, delimiter=",", quotechar='"')
        writer.writerow(d)
        print('ID登録しました')

except Exception as e:
  print(e)
  with open(file_name, 'w', encoding='UTF-8', newline="") as f:
    writer = csv.DictWriter(f, fieldnames=fieldnames, delimiter=",", quotechar='"')

    # writeheaderでヘッダー出力
    writer.writeheader()

    d = {'ID': id, 'PASS': password}
    writer.writerow(d)
    print('ファイル生成とID登録しました')