我把Google的robotstxt解析库port到rust了，并且用ffi的方式跑通了C++的测试用例。

地址：https://github.com/Folyd/robotstxt

robotstxt

A native Rust port of Google's robots.txt parser and matcher C++ library.

• Native Rust port, no third-part crate dependency
• Preserves all behavior of original library
• Consistent API with original library
• 100% google original test passed

Installation

[dependencies]
robotstxt = "0.2.0"

Quick start

use robotstxt::DefaultMatcher;

let mut matcher = DefaultMatcher::default();
let robots_body = "user-agent: FooBot\n\
                   disallow: /\n";
assert_eq!(false, matcher.one_agent_allowed_by_robots(robots_body, "FooBot", "https://foo.com/"));