OXYGENHUB
◆ v0.9.5 oxygenhub / crates / hub / src / repos / names.rs
4.9 KiB · Rust · last changed Drops: per-user gists, each a small hidden Oxygen repository (#279) 15 days ago source blame history raw
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//! Owner and repository names (hub spec §3.2) and the top-level path
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//! segments no owner may take.
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use std::fmt;
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/// `owner/name`, both validated.
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#[derive(Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub struct RepoName {
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    pub owner: String,
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    pub name: String,
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}
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/// Top-level path segments reserved for the hub itself.
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pub const RESERVED: &[&str] = &[
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    "api",
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    "static",
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    "login",
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    "logout",
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    "register",
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    "settings",
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    "explore",
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    "search",
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    "notifications",
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    "new",
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    "orgs",
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    "admin",
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    "style.css",
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    "favicon.ico",
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    "favicon.svg",
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    "health",
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    "avatar",
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    "help",
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    "projects",
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    "assets",
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    ".well-known",
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    // Live pages, CSP reports and the security pages (oxygenhub#204, #222, #224, #230).
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    "live",
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    "csp-report",
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    "security.txt",
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    "security-contact",
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    // The transparency log, the metrics and Insights (oxygenhub#238, #212, #257).
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    "log",
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    "metrics",
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    "insights",
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    // Drops: `/drops` is the viewer's own (oxygenhub#279).
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    "drops",
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];
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/// The repository name no repository may take: `/{owner}/drops` is the
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/// owner's Drops page, and `/{owner}/drops/{id}` a drop (oxygenhub#279).
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pub const DROPS: &str = "drops";
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/// A drop's id: lowercase hex, 16 to 40 characters (they are made with
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/// 24, 96 random bits, so a secret drop's address cannot be guessed).
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pub fn valid_drop_id(s: &str) -> bool {
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    (16..=40).contains(&s.len()) && s.bytes().all(|b| b.is_ascii_digit() || (b'a'..=b'f').contains(&b))
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}
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/// A repository name: a segment, not `drops`; or a drop's, `drops/ID`,
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/// which no repository name can be, since it holds a slash.
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pub fn valid_repo_name(s: &str) -> bool {
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    match s.split_once('/') {
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        Some((DROPS, id)) => valid_drop_id(id),
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        Some(_) => false,
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        None => valid_segment(s) && !s.eq_ignore_ascii_case(DROPS),
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    }
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}
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/// `[A-Za-z0-9][A-Za-z0-9._-]{0,63}`, not `.`/`..`, not ending in `.git`.
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pub fn valid_segment(s: &str) -> bool {
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    let mut chars = s.chars();
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    let Some(first) = chars.next() else { return false };
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    if !first.is_ascii_alphanumeric() || s.len() > 64 {
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        return false;
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    }
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    if !chars.all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '_' | '-')) {
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        return false;
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    }
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    s != "." && s != ".." && !s.ends_with(".git")
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}
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pub fn valid_owner(s: &str) -> bool {
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    valid_segment(s) && !RESERVED.contains(&s)
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}
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impl RepoName {
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    pub fn new(owner: &str, name: &str) -> Option<RepoName> {
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        if valid_owner(owner) && valid_repo_name(name) {
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            Some(RepoName { owner: owner.into(), name: name.into() })
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        } else {
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            None
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        }
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    }
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    /// `owner/name`.
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    pub fn parse(slug: &str) -> Option<RepoName> {
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        let (owner, name) = slug.split_once('/')?;
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        RepoName::new(owner, name)
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    }
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    pub fn url(&self) -> String {
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        format!("/{}/{}", self.owner, self.name)
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    }
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    /// A drop's repository, `owner/drops/ID`.
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    pub fn drop(owner: &str, id: &str) -> Option<RepoName> {
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        RepoName::new(owner, &format!("{DROPS}/{id}"))
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    }
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    /// The drop's id, when this is a drop's repository.
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    pub fn drop_id(&self) -> Option<&str> {
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        self.name.strip_prefix(DROPS)?.strip_prefix('/')
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    }
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}
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impl fmt::Display for RepoName {
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    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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        write!(f, "{}/{}", self.owner, self.name)
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    }
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}
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#[cfg(test)]
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mod tests {
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    use super::*;
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    #[test]
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    fn names() {
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        assert!(RepoName::parse("andy/oxygen").is_some());
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        assert!(RepoName::parse("andy/oxy.gen-2_x").is_some());
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        assert!(RepoName::parse("api/x").is_none(), "reserved owner");
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        assert!(RepoName::parse("andy/x.git").is_none(), "mirror URL");
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        assert!(RepoName::parse("andy/..").is_none());
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        assert!(RepoName::parse(".andy/x").is_none());
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        assert!(RepoName::parse("andy/a b").is_none());
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        assert!(RepoName::parse("andy").is_none());
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        assert!(RepoName::parse(&format!("andy/{}", "a".repeat(65))).is_none());
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        assert_eq!(RepoName::parse("andy/oxygen").unwrap().url(), "/andy/oxygen");
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        // `drops` is the Drops page; a drop is `drops/ID` (#279).
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        assert!(RepoName::parse("andy/drops").is_none() && RepoName::parse("andy/Drops").is_none());
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        assert!(RepoName::parse("drops/x").is_none(), "reserved owner");
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        let d = RepoName::parse("andy/drops/0123456789abcdef01234567").unwrap();
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        assert_eq!(d.drop_id(), Some("0123456789abcdef01234567"));
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        assert_eq!(d.url(), "/andy/drops/0123456789abcdef01234567");
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        assert_eq!(RepoName::drop("andy", "0123456789abcdef01234567"), Some(d));
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        assert!(RepoName::parse("andy/drops/short").is_none());
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        assert!(RepoName::parse("andy/drops/0123456789ABCDEF01234567").is_none());
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        assert!(RepoName::parse("andy/x/0123456789abcdef01234567").is_none());
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        assert_eq!(RepoName::parse("andy/oxygen").unwrap().drop_id(), None);
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    }
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}