1// Copyright (c) 2019 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
 2//
 3// This Source Code Form is subject to the terms of the Mozilla Public
 4// License, v. 2.0. If a copy of the MPL was not distributed with this
 5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 6
 7use std::convert::TryFrom;
 8use std::io::{self, Read};
 9use std::env;
10use xmpp_parsers::{
11    Element,
12    disco::DiscoInfoResult,
13    caps::{Caps, compute_disco as compute_disco_caps, hash_caps},
14    ecaps2::{ECaps2, compute_disco as compute_disco_ecaps2, hash_ecaps2},
15    hashes::Algo,
16};
17
18fn get_caps(disco: &DiscoInfoResult, node: String) -> Result<Caps, String> {
19    let caps_data = compute_disco_caps(&disco);
20    let caps_hash = hash_caps(&caps_data, Algo::Sha_1)?;
21    Ok(Caps::new(node, caps_hash))
22}
23
24fn get_ecaps2(disco: &DiscoInfoResult) -> Result<ECaps2, String> {
25    let ecaps2_data = compute_disco_ecaps2(&disco).unwrap();
26    let ecaps2_sha256 = hash_ecaps2(&ecaps2_data, Algo::Sha_256)?;
27    let ecaps2_sha3_256 = hash_ecaps2(&ecaps2_data, Algo::Sha3_256)?;
28    Ok(ECaps2::new(vec![ecaps2_sha256, ecaps2_sha3_256]))
29}
30
31fn main() -> Result<(), ()> {
32    let args: Vec<_> = env::args().collect();
33    if args.len() != 2 {
34        println!("Usage: {} <node>", args[0]);
35        return Err(());
36    }
37    let node = args[1].clone();
38
39    eprintln!("Reading a disco#info payload from stdin...");
40
41    // Read from stdin.
42    let stdin = io::stdin();
43    let mut data = String::new();
44    let mut handle = stdin.lock();
45    handle.read_to_string(&mut data).unwrap();
46
47    // Parse the payload into a DiscoInfoResult.
48    let elem: Element = data.parse().unwrap();
49    let disco = DiscoInfoResult::try_from(elem).unwrap();
50
51    // Compute both kinds of caps.
52    let caps = get_caps(&disco, node).unwrap();
53    let ecaps2 = get_ecaps2(&disco).unwrap();
54
55    // Print them.
56    let caps_elem = Element::from(caps);
57    let ecaps2_elem = Element::from(ecaps2);
58    println!("{}", String::from(&caps_elem));
59    println!("{}", String::from(&ecaps2_elem));
60
61    Ok(())
62}