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extern crate semver;
extern crate toml;
use std::io::Write;
/// reads a security advisory of the form
/// https://github.com/RustSec/advisory-db/blob/a24932e220dfa9be8b0b501210fef8a0bc7ef43e/EXAMPLE_ADVISORY.md
/// and a crate version number,
/// and returns 0 if the crate version is patched
/// and returns 1 if the crate version is *not* patched
///
/// If PRINT_ADVISORY is set, the advisory is printed if it matches.
fn main() {
let mut args = std::env::args_os();
let file = args.nth(1).expect("security advisory md file is $1");
let crate_version =
args.nth(0).expect("crate version is $2")
.into_string().expect("crate version string not utf8")
;
let crate_version = semver::Version::parse(&crate_version).expect(&format!("this is not a semver version: {}", &crate_version));
let filename = file.to_string_lossy();
let content = std::fs::read(&file).expect(&format!("could not read {}", filename));
let content =
std::str::from_utf8(&content).expect(&format!("file {} was not encoded as utf-8", filename));
let content = content.trim_start();
let toml_start = content
.strip_prefix("```toml").expect(&format!("file did not start with ```toml: {}", filename));
let toml_end_index = toml_start.find("```").expect(&format!("the toml section did not end, no `` found: {}", filename));
let toml = &toml_start[..toml_end_index];
let toml : toml::Value = toml::de::from_slice(toml.as_bytes()).expect(&format!("could not parse toml: {}", filename));
let versions = toml
.as_table().expect(&format!("the toml is not a table: {}", filename))
.get("versions").expect(&format!("the toml does not contain the versions field: {}", filename))
.as_table().expect(&format!("the toml versions field must be a table: {}", filename));
let unaffected = match versions.get("unaffected") {
Some(u) => u
.as_array().expect(&format!("the toml versions.unaffected field must be a list of semvers: {}", filename))
.iter()
.map(|v| semver::VersionReq::parse(v.as_str().expect(&format!("the version field {} is not a string", v))).expect(&format!("the version field {} is not a valid semver VersionReq", v)))
.collect(),
None => vec![]
};
let mut patched : Vec<semver::VersionReq> = versions.get("patched").expect(&format!("the toml versions.patched field must exist: {}", filename))
.as_array().expect(&format!("the toml versions.patched field must be a list of semvers: {}", filename))
.iter()
.map(|v| semver::VersionReq::parse(v.as_str().expect(&format!("the version field {} is not a string", v))).expect(&format!("the version field {} is not a valid semver VersionReq", v)))
.collect();
patched.extend_from_slice(&unaffected[..]);
let is_patched_or_unaffected = patched.iter().any(|req| req.matches(&crate_version));
if is_patched_or_unaffected {
std::process::exit(0);
} else {
if std::env::var_os("PRINT_ADVISORY").is_some() {
write!(std::io::stderr(), "Advisory {} matched!\n{}\n", filename, content).unwrap();
}
std::process::exit(1);
}
}
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