# WebDAV Copyparty Troubleshooting Guide

This document captures the issues encountered and solutions found while setting up WebDAV with copyparty behind an nginx reverse proxy.

## Initial Problem

WebDAV clients (X-plore File Manager) could browse folders but could not upload files, receiving HTTP 301 redirects instead of successful uploads.

## Root Causes Identified

### 1. Nginx Automatic Redirects
**Problem**: Nginx was automatically adding trailing slashes and performing internal redirects that broke WebDAV PUT requests.

**Symptoms**:
- PROPFIND (directory listing) worked: `HTTP/1.1 207 Multi-Status`
- PUT (file upload) failed: `HTTP/1.1 301 Moved Permanently`
- Web interface worked normally
- Direct curl uploads worked through nginx

**Solution**: Disable nginx automatic redirects:
```nginx
server {
    # Critical: Disable automatic redirects for WebDAV
    merge_slashes off;

    location ~ ^/files(/.*)?$ {
        # Critical: Disable nginx response modifications
        proxy_redirect off;
    }
}
```

### 2. Copyparty Permissions
**Problem**: Copyparty required explicit delete permissions for WebDAV DELETE operations.

**Symptoms**:
- File uploads worked after nginx fix
- File deletions failed: `'delete' not allowed for user hoborg`
- Error: `HTTP/1.1 403 Forbidden`

**Solution**: Add `d` (delete) permission to user accounts:

### 3. URL Encoding Issues
**Problem**: Files/folders with spaces or special characters in names caused HTTP 400 errors.

**Symptoms**:
- Files without spaces upload successfully
- Files with spaces in path fail: `HTTP/1.1 400 Bad Request`
- Logs show "bad headers" errors from copyparty
- URLs like `/files/folder/file%20name.txt` fail

**Solution**: Pass original request URI to preserve URL encoding:
```nginx
location ~ ^/files(/.*)?$ {
    # Pass original request URI to preserve URL encoding
    proxy_pass http://127.0.0.1:8082;
    # ... other proxy settings
}
```

Instead of `proxy_pass http://127.0.0.1:8082/files$1;` which manipulates the path.

```ini
[/shared]
  /home/hoborg/shared
  accs:
    rw: guest
    rwmd: hoborg  # Changed from 'rwm' to 'rwmd'
```

**Copyparty Permission Flags**:
- `r` (read): List folders, download files
- `w` (write): Upload files
- `m` (move): Move/rename files and folders
- `d` (delete): Permanently delete files and folders
- `a` (admin): See uploader IPs, config reload

## Debugging Process

### Step 1: Isolate the Problem
Test direct copyparty connection vs nginx proxy:

```bash
# Test direct copyparty (bypassing nginx)
curl -X PUT "http://127.0.0.1:8082/files/shared/test.txt" \
  -u "hoborg:password" -d "test content" -v

# Test through nginx proxy
curl -X PUT "https://ak-homelab.duckdns.org/files/shared/test.txt" \
  -u "hoborg:password" -d "test content" -v
```

**Result**: Direct copyparty worked, nginx proxy returned 301 → nginx issue

### Step 2: Monitor Logs
Check what HTTP methods are actually reaching copyparty:

```bash
# Monitor copyparty logs in real-time
sudo journalctl -u copyparty -f

# Monitor nginx access logs
sudo tail -f /var/log/nginx/access.log
```

**Finding**: X-plore PUT requests never reached copyparty logs → nginx blocking

### Step 3: Test WebDAV Methods
```bash
# Test PROPFIND (directory listing)
curl -X PROPFIND "https://ak-homelab.duckdns.org/files/shared/" \
  -u "hoborg:password" -H "Depth: 1" -v

# Test PUT (file upload)
curl -X PUT "https://ak-homelab.duckdns.org/files/shared/test.txt" \
  -u "hoborg:password" -d "test content" -v

# Test DELETE (file deletion)
curl -X DELETE "https://ak-homelab.duckdns.org/files/shared/test.txt" \
  -u "hoborg:password" -v
```

## Final Working Configuration

### Nginx Configuration (`/etc/nginx/sites-available/homelab`)
```nginx
server {
    listen 443 ssl;
    server_name ak-homelab.duckdns.org;

    # Critical: Disable automatic redirects for WebDAV
    merge_slashes off;

    # Copyparty file server - WORKING WebDAV config
    location ~ ^/files(/.*)?$ {
        # Explicitly allow WebDAV methods
        limit_except GET POST PUT DELETE PROPFIND PROPPATCH MKCOL COPY MOVE LOCK UNLOCK { deny all; }

        # Pass original request URI to preserve URL encoding
        proxy_pass http://127.0.0.1:8082;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # WebDAV specific headers
        proxy_set_header Depth $http_depth;
        proxy_set_header Destination $http_destination;
        proxy_set_header Overwrite $http_overwrite;
        proxy_set_header If $http_if;
        proxy_set_header Lock-Token $http_lock_token;

        # Large file upload support
        client_max_body_size 10G;
        client_body_buffer_size 128k;

        # Upload timeout settings
        proxy_connect_timeout 300s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;

        # Critical: Streaming uploads for WebDAV
        proxy_buffering off;
        proxy_request_buffering off;
        
        # Critical: Use HTTP/1.1 and fix connection headers
        proxy_http_version 1.1;
        proxy_set_header Connection "";

        # Critical: Disable nginx response modifications
        proxy_redirect off;
    }
}
```

### Copyparty Configuration (`~/.config/copyparty/copyparty.conf`)
```ini
[global]
  i: 127.0.0.1
  p: 8082
  rp-loc: /files
  rproxy: -1
  usernames
  chpw

[accounts]
  hoborg: password

[/shared]
  /home/hoborg/shared
  accs:
    rwmd: hoborg  # r=read, w=write, m=move, d=delete
```

## X-plore Client Settings
- **Server**: `ak-homelab.duckdns.org`
- **Path**: `/files/shared/` (or other folder paths)
- **Protocol**: HTTPS (port 443)
- **Username**: `hoborg`
- **Password**: [user password]

## Key Lessons Learned

1. **Nginx proxy_redirect off is critical** - Prevents nginx from modifying WebDAV responses
2. **merge_slashes off prevents automatic redirects** - Stops nginx from "fixing" WebDAV paths
3. **Copyparty needs explicit 'd' permission** - Delete operations require separate permission flag
4. **Test direct vs proxied connections** - Isolates nginx vs backend issues
5. **Monitor logs during troubleshooting** - Shows exactly what requests reach the backend

## Commands for Future Troubleshooting

```bash
# Test WebDAV connectivity
curl -X PROPFIND "https://ak-homelab.duckdns.org/files/shared/" \
  -u "username:password" -H "Depth: 1" -v

# Monitor copyparty service
sudo journalctl -u copyparty -f

# Check nginx configuration
sudo nginx -t
sudo systemctl reload nginx

# Test file operations
curl -X PUT "https://ak-homelab.duckdns.org/files/shared/test.txt" \
  -u "username:password" -d "test" -v
curl -X DELETE "https://ak-homelab.duckdns.org/files/shared/test.txt" \
  -u "username:password" -v
```