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#[macro_use]
extern crate lazy_static;
extern crate regex;
use regex::Regex;
use serde_json::Value;
use std::fs;
use std::path::Path;
lazy_static! {
static ref UA: Result<regex::Regex, regex::Error> = {
let regex = match Path::new("crawler-user-agents.json").exists() {
true => {
let json =
fs::read_to_string("crawler-user-agents.json").expect("Unable to read crawler-user-agents.json");
let data: Vec<Value> = serde_json::from_str(&json).expect("Error converting json with serde_json");
let mut ret: String = String::from("(");
ret.push_str(
data.iter()
.map(|item| item.get("pattern").unwrap().to_string().replace("\"", ""))
.collect::<Vec<String>>()
.join("|")
.as_str(),
);
ret.push(')');
Some(ret)
}
false => None,
};
match regex {
Some(r) => Regex::new(&r),
None => {
panic!("crawler-user-agents.json does not exist in this directory! Get a copy from: https://github.com/monperrus/crawler-user-agents");
}
}
};
}
pub fn bot(user_agent: &str) -> bool {
match UA.as_ref() {
Ok(r) => r.is_match(user_agent),
Err(e) => {
panic!("Regex error: {}", e);
}
}
}