72 lines
1.7 KiB
Rust
72 lines
1.7 KiB
Rust
extern crate dip;
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extern crate hmac;
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extern crate secstr;
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extern crate serde_json;
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extern crate sha1;
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#[macro_use]
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extern crate serde_derive;
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extern crate failure;
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extern crate generic_array;
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#[macro_use]
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extern crate structopt;
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use std::collections::HashMap;
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use std::io::{self, Read};
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use std::iter::FromIterator;
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use failure::{err_msg, Error};
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use generic_array::GenericArray;
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use hmac::{Hmac, Mac};
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use secstr::*;
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use sha1::Sha1;
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use structopt::StructOpt;
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#[derive(StructOpt)]
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struct Opt {
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/// JSON input
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#[structopt(short = "c", long = "config")]
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pub config: String,
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}
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#[derive(Serialize, Deserialize)]
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struct Config {
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secret: String,
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}
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#[derive(Serialize, Deserialize)]
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struct Payload {
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body: String,
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headers: HashMap<String, String>,
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}
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fn main() -> Result<(), Error> {
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let args = Opt::from_args();
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let config: Config = serde_json::from_str(&args.config)?;
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let mut payload = String::new();
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io::stdin().read_to_string(&mut payload)?;
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let payload: Payload = serde_json::from_str(&payload)?;
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let secret = GenericArray::from_iter(config.secret.bytes());
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let mut mac = Hmac::<Sha1>::new(&secret);
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mac.input(payload.body.as_bytes());
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let signature = mac
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.result()
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.code()
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.into_iter()
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.map(|b| format!("{:02x}", b))
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.collect::<Vec<_>>()
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.join("");
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let auth = payload
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.headers
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.get("X-Hub-Signature")
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.ok_or(err_msg("Missing auth header"))?;
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let left = SecStr::from(format!("sha1={}", signature));
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let right = SecStr::from(auth.bytes().collect::<Vec<_>>());
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assert!(left == right, "HMAC signature didn't match");
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println!("{}", payload.body);
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Ok(())
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}
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