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#!/usr/bin/env python3
import os
import sys
import random
import string
import json
from datetime import datetime, timezone, timedelta
CWD = os.getcwd()
DATABASE_DIRECTORY = os.path.join(CWD, "database_directory")
ALLOWED_TYPES = ["plain", "password"]
ALLOWED_EXPIRATIONS = [
"never",
"burn_after_read",
"10_minutes",
"1_hour",
"1_day",
"1_week",
"2_weeks",
"1_month",
"6_months",
"1_year",
]
class SubmitConstants:
TYPE: str = "type"
TITLE: str = "title"
EXPIRATION: str = "expiration"
PASTED_TEXT: str = "pasted_text"
DATE_CREATED: str = "date_created"
def convert(obj):
if isinstance(obj, datetime):
return obj.isoformat()
raise TypeError("Type not serializable")
def check_working_dir(allowed_dir):
if allowed_dir is None or allowed_dir != CWD:
print("Content-Type: text/plain")
print("")
print("NOT ALLOWED DIRECTORY")
sys.exit(0)
def status_405():
print("Status: 405 Method Not Allowed")
print("Content-Type: text/plain")
print("")
print("405 Method Not Allowed")
sys.exit(0)
def status_415():
print("Status: 415 Unsupported Media Type")
print("Content-Type: text/plain")
print("")
print("415 Unsupported Media Type.")
sys.exit(0)
def status_404():
print("Status: 404 Not Found")
print("Content-Type: text/plain")
print("")
print("File not found")
sys.exit(0)
def check_method(method):
if method not in ["GET", "POST"]:
status_405()
def get_content_lenght():
temp_len = os.environ.get("CONTENT_LENGTH", None)
if temp_len is not None and temp_len.isdigit():
return int(temp_len)
return 0
def generate_random_string():
return "".join(
random.choices(
string.ascii_uppercase + string.ascii_lowercase + string.digits, k=16
)
)
def validate_payload(payload):
if (
SubmitConstants.TYPE in payload
and payload[SubmitConstants.TYPE] in ALLOWED_TYPES
):
if SubmitConstants.TITLE in payload:
if (
SubmitConstants.EXPIRATION in payload
and payload[SubmitConstants.EXPIRATION] in ALLOWED_EXPIRATIONS
):
if SubmitConstants.PASTED_TEXT in payload:
return
status_415()
def submit(post_data):
if not os.path.exists(DATABASE_DIRECTORY):
os.makedirs(DATABASE_DIRECTORY)
full_path = ""
while True:
random_id = generate_random_string()
full_path = os.path.join(DATABASE_DIRECTORY, f"{random_id}.json")
if not os.path.exists(full_path):
break
data = {
SubmitConstants.TYPE: post_data[SubmitConstants.TYPE],
SubmitConstants.TITLE: post_data[SubmitConstants.TITLE],
SubmitConstants.EXPIRATION: post_data[SubmitConstants.EXPIRATION],
SubmitConstants.PASTED_TEXT: post_data[SubmitConstants.PASTED_TEXT],
SubmitConstants.DATE_CREATED: datetime.now(timezone.utc),
}
with open(full_path, "w") as json_file:
json.dump(data, json_file, indent=4, default=convert)
print("Content-Type: application/json")
print("")
print(json.dumps({"id": random_id}))
def handle_data(data):
expiry = data[SubmitConstants.EXPIRATION]
date = datetime.fromisoformat(data[SubmitConstants.DATE_CREATED])
date_now = datetime.now(timezone.utc)
deleted = False
delete_after_read = False
if expiry == "never":
pass
elif expiry == "burn_after_read":
deleted = False
delete_after_read = True
elif expiry == "10_minutes":
if date + timedelta(minutes=10) <= date_now:
deleted = True
elif expiry == "1_hour":
if date + timedelta(hours=1) <= date_now:
deleted = True
elif expiry == "1_week":
if date + timedelta(weeks=1) <= date_now:
deleted = True
elif expiry == "2_weeks":
if date + timedelta(weeks=2) <= date_now:
deleted = True
elif expiry == "1_month":
if date + timedelta(days=30) <= date_now:
deleted = True
elif expiry == "6_months":
if date + timedelta(days=180) <= date_now:
deleted = True
elif expiry == "1_year":
if date + timedelta(days=365) <= date_now:
deleted = True
return delete_after_read, deleted
def return_paste(query_string):
if query_string is None or not query_string.startswith("id="):
status_415()
id = query_string.split("=")
if len(id) != 2:
status_415()
id = id[1]
full_path = os.path.join(DATABASE_DIRECTORY, f"{id}.json")
directory = os.path.dirname(full_path)
os.chdir(directory)
if os.getcwd() != DATABASE_DIRECTORY:
status_415()
if not os.path.exists(full_path):
status_404()
with open(full_path, "r") as file:
data = json.load(file)
try:
delete_after_read, deleted = handle_data(data)
if deleted:
os.remove(full_path)
status_404()
print("Content-Type: application/json")
print("")
print(json.dumps(data, default=convert))
if delete_after_read:
os.remove(full_path)
sys.exit(0)
except Exception:
status_404()
allowed_dir = os.environ.get("ALLOWED_DIR", None)
check_working_dir(allowed_dir)
method = os.environ.get("REQUEST_METHOD", None)
check_method(method)
script_name = os.environ.get("SCRIPT_NAME", None)
query_string = os.environ.get("QUERY_STRING", None)
content_type = os.environ.get("CONTENT_TYPE", None)
content_length = get_content_lenght()
if method == "GET":
if script_name == "/paste":
return_paste(query_string)
elif method == "POST":
post_data = sys.stdin.read(content_length)
post_data = json.loads(post_data)
if script_name == "/submit":
validate_payload(post_data)
submit(post_data)
sys.exit(0)
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