Function validate_path 

pub fn validate_path(path: &Path, allowed_base: &Path) -> Result<PathBuf>

Validate file path and prevent path traversal attacks

Performs comprehensive path validation:

1. Canonicalizes path (resolves symlinks, relative components)
2. Validates against allowed base directory
3. Checks component lengths
4. Validates file name characters

Security Considerations

• Prevents path traversal (../ attacks)
• Protects against symlink attacks
• Validates path components
• Ensures path stays within allowed directory

Errors

Returns error if:

• Path does not exist (canonicalize fails)
• Path escapes allowed base directory
• Path components exceed length limits
• Path contains invalid characters

Examples

use backup_suite::core::validation::validate_path;
use std::path::PathBuf;
use std::env;

let current_dir = env::current_dir().unwrap();
let safe_path = current_dir.join("backup/data.txt");

// Valid path within current directory
assert!(validate_path(&safe_path, &current_dir).is_ok());

// Invalid: path traversal attempt
let malicious = PathBuf::from("/tmp/../../etc/passwd");
assert!(validate_path(&malicious, &current_dir).is_err());