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|
extern crate el_exec;
use std::os::unix::ffi::OsStrExt;
use std::ffi::{CString};
#[derive(Clone, Debug, PartialEq, Eq,)]
struct Parsed<'a> {
protocol: Protocol,
domain: &'a str,
port: &'a str,
path: &'a str,
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
enum Protocol {
Http,
Https,
}
impl Protocol {
fn string(&self) -> &str {
match self {
Protocol::Http => "http",
Protocol::Https => "https"
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
enum Error {
NotHttp,
ColonButNoPort
}
fn mini_parse_http(url: &str) -> Result<Parsed, Error> {
let (protocol, off) = {
if url.starts_with("https://") {
(Protocol::Https, 8)
} else if url.starts_with("http://") {
(Protocol::Http, 7)
} else {
return Err(Error::NotHttp)
}
};
let (_, path) = url.split_at(off);
let (domain_port, path) = match path.find('/') {
Some(boundary) => path.split_at(boundary),
None => (path, "/")
};
let (domain, port) = match domain_port.find(':') {
Some(boundary) => match domain_port.split_at(boundary) {
(d, ":") => return Err(Error::ColonButNoPort),
(d, p) => unsafe { (d, p.get_unchecked(1..)) }
},
None => match protocol {
Protocol::Http => (domain_port, "80"),
Protocol::Https => (domain_port, "443"),
}
};
Ok(Parsed {
protocol,
domain,
port,
path
})
}
fn main() -> std::io::Result<()> {
let args = std::env::args().collect::<Vec<_>>();
let prog_index = 2;
if args.len() < prog_index {
eprintln!("1st arg is http/https url");
std::process::exit(100);
}
let Parsed { domain, port, protocol, path } = mini_parse_http(&args[1]).unwrap_or_else(
|err| {
eprintln!("could not parse url: {:?}", err);
std::process::exit(100);
}
);
let args = std::env::args_os().into_iter()
.map(|arg| CString::new(arg.as_bytes()).unwrap())
.collect::<Vec<_>>();
std::env::set_var("host", domain);
std::env::set_var("port", port);
std::env::set_var("protocol", protocol.string());
std::env::set_var("path", path);
el_exec::xmexec0(&args[prog_index..]);
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_mini_parse() {
assert_eq!(mini_parse_http("https://abc.bar:8080/blabla"),
Ok(Parsed {
protocol: Protocol::Https,
domain: "abc.bar",
port: "8080",
path: "/blabla"
}));
assert_eq!(mini_parse_http("http://abc.bar:8080/blabla"),
Ok(Parsed {
protocol: Protocol::Http,
domain: "abc.bar",
port: "8080",
path: "/blabla"
}));
assert_eq!(mini_parse_http("http://abc.bar/blabla"),
Ok(Parsed {
protocol: Protocol::Http,
domain: "abc.bar",
port: "80",
path: "/blabla"
}));
assert_eq!(mini_parse_http("https://f"),
Ok(Parsed {
protocol: Protocol::Https,
domain: "f",
port: "443",
path: "/"
}));
assert_eq!(mini_parse_http("foo.bar"),
Err(Error::NotHttp));
assert_eq!(mini_parse_http("mirror://abc.bar:8080/blabla"),
Err(Error::NotHttp));
assert_eq!(mini_parse_http("http://abc.bar:"),
Err(Error::ColonButNoPort));
}
}
|
