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FROM python:3.11-slim
# Create non-root user
RUN useradd -m -u 1000 appuser
# Set working directory
WORKDIR /app
# Copy requirements first for better caching
COPY requirements.txt .
# Install dependencies
RUN pip install --no-cache-dir -r requirements.txt
# Copy only necessary files
COPY main.py .
# Create uploads directory
RUN mkdir -p uploads && chown appuser:appuser uploads
# Switch to non-root user
USER appuser
# Expose port
EXPOSE 8000
# Run the application
CMD ["python", "main.py"]

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Apache License
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# Linedump
**CLI-only text pastebin service.**
- Status: Beta - expect minor changes
- Instance: [linedump.com](https://linedump.com/)
- Inspired by:
- [0x0.st](https://git.0x0.st/mia/0x0)
- [transfer.sh](https://github.com/dutchcoders/transfer.sh)
**Note:** content is stored unencrypted on the server - consider it public! - Use client-side encryption example in *Usage* section.
---
## Features
**Available**:
- save and share content via CLI
- up- and download in CLI possible
- rate-limits
**Ideas**:
- integrated retention/purge function
**Not planned**:
- GUI *(work around possible, WIP)*
- media besides text (abuse potential and moderation effort too high - there are other projects for it available)
---
## Usage
---
## Installation
Use with reverse-proxy and HTTPS!
### Environment Variables
| Variable | Description | Default | Required |
|----------|-------------|---------|----------|
| `DOMAIN` | Domain name used in the application responses and examples | `linedump.com` | No |
| `DESCRIPTION` | Application description displayed in the root endpoint | `(open source*) text-only CLI paste and share application.` | No |
| `MAX_FILE_SIZE_MB` | Maximum file size limit in megabytes | `50` | No |
| `RATE_LIMIT` | Rate limit for uploads (format: "requests/timeframe") | `50/hour` | No |
| `URL_PATH_LENGTH` | Length of generated URL paths (number of characters) | `6` | No |
---
## Security
For security concerns or reports, please contact via `hello a t uphillsecurity d o t com` [gpg](https://uphillsecurity.com/gpg).
---
## License
**Apache License**
Version 2.0, January 2004
http://www.apache.org/licenses/
[LICENSE FILE](/LICENSE)
✅ Commercial use
✅ Modification
✅ Distribution
✅ Patent use
✅ Private use
✅ Limitations
❌Trademark use
❌Liability
❌Warranty

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from fastapi import FastAPI, HTTPException, Request, Depends
from fastapi.responses import PlainTextResponse
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded
import bleach
import secrets
import string
import os
from pathlib import Path
import hashlib
from typing import Optional
from collections import defaultdict
import threading
DOMAIN = os.getenv('DOMAIN', 'linedump.com')
DESCRIPTION = os.getenv('DESCRIPTION', '(open source*) text-only CLI paste and share application.')
MAX_FILE_SIZE_MB = int(os.getenv('MAX_FILE_SIZE_MB', '50'))
RATE_LIMIT = os.getenv('RATE_LIMIT', '50/hour')
URL_PATH_LENGTH = int(os.getenv('URL_PATH_LENGTH', '6'))
limiter = Limiter(key_func=get_remote_address)
app = FastAPI(title="linedump", version="1.0.0")
app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
UPLOAD_DIR = Path("uploads")
UPLOAD_DIR.mkdir(exist_ok=True)
MAX_FILE_SIZE = MAX_FILE_SIZE_MB * 1024 * 1024 # Convert MB to bytes
MAX_FILES_PER_IP = 100
file_counter = defaultdict(int)
lock = threading.Lock()
def generate_random_path(length: int = None) -> str:
if length is None:
length = URL_PATH_LENGTH
alphabet = string.ascii_letters + string.digits
return ''.join(secrets.choice(alphabet) for _ in range(length))
def get_client_ip(request: Request) -> str:
x_real_ip = request.headers.get("X-Real-IP")
if x_real_ip:
return x_real_ip.strip()
return request.client.host
def check_file_limit(request: Request) -> bool:
client_ip = get_client_ip(request)
with lock:
return file_counter[client_ip] < MAX_FILES_PER_IP
def validate_content(content: str) -> bool:
"""Basic validation for content size and encoding"""
if len(content) > MAX_FILE_SIZE:
return False
# Check for null bytes (file system attacks)
if '\x00' in content:
return False
try:
# Ensure it's valid UTF-8
content.encode('utf-8')
return True
except UnicodeEncodeError:
return False
@app.post("/", response_class=PlainTextResponse)
@limiter.limit(RATE_LIMIT)
async def upload_text(request: Request):
if not check_file_limit(request):
raise HTTPException(status_code=429, detail="File limit exceeded")
body = await request.body()
content = body.decode('utf-8', errors='ignore')
if not validate_content(content):
raise HTTPException(status_code=400, detail="Invalid content")
if not content.strip():
raise HTTPException(status_code=400, detail="Empty content")
random_path = generate_random_path()
while (UPLOAD_DIR / random_path).exists():
random_path = generate_random_path()
file_path = UPLOAD_DIR / random_path
try:
with open(file_path, 'w', encoding='utf-8') as f:
f.write(content)
client_ip = get_client_ip(request)
with lock:
file_counter[client_ip] += 1
base_url = f"https://{request.headers.get('host', request.url.netloc)}"
return f"{base_url}/{random_path}\n"
except Exception as e:
raise HTTPException(status_code=500, detail="Failed to save file")
@app.get("/{file_path}", response_class=PlainTextResponse)
async def get_file(file_path: str):
if not file_path.isalnum():
raise HTTPException(status_code=404, detail="File not found")
file_location = UPLOAD_DIR / file_path
if not file_location.exists() or not file_location.is_file():
raise HTTPException(status_code=404, detail="File not found")
try:
with open(file_location, 'r', encoding='utf-8') as f:
content = f.read()
return content
except Exception:
raise HTTPException(status_code=500, detail="Failed to read file")
@app.get("/", response_class=PlainTextResponse)
async def root():
return f"""C|_| {DOMAIN}
████ General ████
{DESCRIPTION}
- File limit: {MAX_FILE_SIZE_MB} MB
- Rate limit: {RATE_LIMIT}
- text-only
- no server-side encryption, consider content public or use client-side encryption
████ Usage ████
█ Upload curl:
curl -X POST -d "Cheers" https://{DOMAIN}/ # string
curl -X POST https://{DOMAIN} --data-binary @- < file.txt # file
ip -br a | curl -X POST https://{DOMAIN} --data-binary @- # command output
█ Upload wget:
echo "Cheers" | wget --post-data=@- -O- https://{DOMAIN}/ # string
wget --post-file=file.txt -O- https://{DOMAIN}/ # file
ip -br a | wget --post-data=@- -O- https://{DOMAIN}/ # command output
█ Upload Powershell:
Invoke-RestMethod -Uri "https://{DOMAIN}/" -Method Post -Body "Cheers" # string
Invoke-RestMethod -Uri "https://{DOMAIN}/" -Method Post -InFile "file.txt" # file
ipconfig | Invoke-RestMethod -Uri "https://{DOMAIN}/" -Method Post -Body {{ $_ }} # command output
█ Download:
curl https://{DOMAIN}/{{path}}
wget -O- https://{DOMAIN}/{{path}}
Invoke-RestMethod -Uri "https://{DOMAIN}/{{path}}"
██ Encryption Examples with curl ██
█ Upload text:
echo 'Cheers' \
| openssl enc -aes-256-cbc -pbkdf2 -base64 -pass pass:yourkey \
| curl -X POST -d @- https://{DOMAIN}/
█ Upload file:
openssl enc -aes-256-cbc -pbkdf2 -salt -pass pass:yourkey -base64 < YOURFILE.txt \
| curl -sS -X POST https://{DOMAIN} --data-binary @-
█ Upload command output:
ip -br a \
| openssl enc -aes-256-cbc -pbkdf2 -salt -pass pass:yourkey -base64 \
| curl -sS -X POST https://{DOMAIN} --data-binary @-
█ Download:
curl -s https://{DOMAIN}/PASTE_THE_ID \
| base64 -d \
| openssl enc -d -aes-256-cbc -pbkdf2 -pass pass:yourkey
██ Adv Examples ██
█ Multiple Commands
{{ cmd() {{ printf "\\n# %s\\n" "$*"; "$@"; }}; \\
cmd hostname; \\
cmd ip -br a; \\
}} 2>&1 | curl -X POST https://{DOMAIN} --data-binary @-
████ Further Information ████
More information will follow. Work in Progress.
"""
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="0.0.0.0", port=8000)

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fastapi==0.104.1
uvicorn[standard]==0.24.0
slowapi==0.1.9
bleach==6.1.0