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Identities for entities did.bot
agent llm did
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13 kB · 341 lines
Rust
at main
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use std::collections::BTreeSet;use std::fmt;
use percent_encoding::{utf8_percent_encode, AsciiSet, CONTROLS};
use crate::read::read;use crate::{ AccountAction, AccountAttr, Action, ActionSet, IdentityAttr, MimePattern, NsidPattern, ScopeParseError, Transition,};
/// One parsed scope atom.#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]pub enum Scope { /// The base `atproto` scope every grant carries. Atproto, /// A legacy `transition:*` scope. Transition(Transition), /// `repo:<collection>[?action=...]`. Repo { /// The collection this scope covers, exact or wildcard. collection: NsidPattern, /// Which write actions are covered. actions: ActionSet, }, /// `rpc:<lxm>[?aud=...]`. Rpc { /// The XRPC method this scope covers, exact or wildcard. method: NsidPattern, /// The audience this scope is bound to, percent-decoded: a DID, a /// DID and a service fragment, or `*` for every audience. aud: Option<String>, }, /// `blob:<mime>` or `blob?accept=<mime>[&accept=<mime>…]`. Blob { /// The MIME types this scope covers, exact or wildcard. Sorted, /// deduplicated, and never empty — see [`Scope::blob`]. accept: Vec<MimePattern>, }, /// `identity:<attr>`. This server never grants one; see /// `plan/scope-policy.md`. Identity { /// The part of the account's identity this scope names. attr: IdentityAttr, }, /// `account:<attr>[?action=...]`. Never granted either. Account { /// The part of the account's hosting this scope names. attr: AccountAttr, /// How much control over it this scope grants. action: AccountAction, }, /// `include:<nsid>[?aud=...]` — a permission set. As an atom it admits /// only itself; [`crate::Include`] reads what it grants. Include { /// The set's name, percent-decoded. [`crate::Include::new`] says /// whether it names a set at all. nsid: String, /// The audience the set's `inheritAud` permissions take, /// percent-decoded. aud: Option<String>, }, /// An atom this grammar cannot read as any scope above: an unknown kind, /// such as `space:*`, or a value its kind does not define, such as /// `account:status`. Kept as written, it admits only itself. Unknown(String),}
impl Scope { /// Parses an atom that names one scope, such as /// `repo:app.bsky.feed.post?action=create`, whatever its form's warnings. /// /// An atom that lists several collections or methods names a scope for /// each, and [`ScopeSet::parse`](crate::ScopeSet::parse) is what reads /// it. So does an atom this grammar cannot read, which /// [`ScopeSet::parse`](crate::ScopeSet::parse) keeps as /// [`Scope::Unknown`] and this refuses. pub fn parse(atom: &str) -> Result<Self, ScopeParseError> { let mut scopes = read(atom)?.scopes; match scopes.len() { 1 => Ok(scopes.remove(0)), _ => Err(ScopeParseError::SeveralScopes(atom.to_owned())), } }
/// Does `self` admit every request that `other` admits? /// /// Reflexive and used both directions by [`ScopeSet::intersect`](crate::ScopeSet::intersect): a /// ceiling contains a requested scope, or a requested scope is itself a /// (possibly equal) subset of the ceiling's scope. pub fn contains(&self, other: &Scope) -> bool { if self == other { return true; } match (self, other) { (Scope::Transition(t), _) => t.covers(other), ( Scope::Repo { collection: c1, actions: a1, }, Scope::Repo { collection: c2, actions: a2, }, ) => c1.contains(c2) && a1.contains(a2), ( Scope::Rpc { method: m1, aud: aud1, }, Scope::Rpc { method: m2, aud: aud2, }, ) => m1.contains(m2) && aud_contains(aud1, aud2), (Scope::Blob { accept: a1 }, Scope::Blob { accept: a2 }) => a2 .iter() .all(|wanted| a1.iter().any(|held| held.contains(wanted))), (Scope::Identity { attr: a1 }, Scope::Identity { attr: a2 }) => a1.includes(*a2), ( Scope::Account { attr: a1, action: x1, }, Scope::Account { attr: a2, action: x2, }, ) => a1 == a2 && x1.includes(*x2), _ => false, } }
/// The most specific scope both `self` and `other` admit in common, if /// their admitted requests overlap at all. /// /// `None` is a real refusal, not an error: it means the two scopes name /// disjoint capabilities (a `repo:` ceiling for one collection against a /// request for a different one, say), and the caller — `scope-policy`'s /// ceiling check — is expected to report that by name. pub fn intersect(&self, other: &Scope) -> Option<Scope> { if self.contains(other) { return Some(other.clone()); } if other.contains(self) { return Some(self.clone()); } match (self, other) { ( Scope::Repo { collection: c1, actions: a1, }, Scope::Repo { collection: c2, actions: a2, }, ) => Some(Scope::Repo { collection: c1.intersect(c2)?, actions: a1.intersect(a2)?, }), ( Scope::Rpc { method: m1, aud: aud1, }, Scope::Rpc { method: m2, aud: aud2, }, ) => { let aud = intersect_aud(aud1, aud2)?; Some(Scope::Rpc { method: m1.intersect(m2)?, aud, }) } (Scope::Blob { accept: a1 }, Scope::Blob { accept: a2 }) => { let overlap: Vec<MimePattern> = a1 .iter() .flat_map(|held| a2.iter().filter_map(|wanted| held.intersect(wanted))) .collect(); if overlap.is_empty() { return None; } Some(Scope::blob(overlap)) } _ => None, } }
/// The `repo:` scope one record write needs: `action` on exactly /// `collection`. pub fn repo_write(collection: &str, action: Action) -> Scope { Scope::Repo { collection: NsidPattern::Exact(collection.to_owned()), actions: ActionSet::Only(BTreeSet::from([action])), } }
/// A `blob:` scope over `accept`, canonical: sorted, deduplicated, and /// with any pattern another one already covers dropped, so /// `blob?accept=image/*&accept=image/png` is `blob:image/*`. /// /// # Panics /// /// If `accept` is empty. Every caller builds it from something. #[must_use] pub fn blob(mut accept: Vec<MimePattern>) -> Scope { assert!(!accept.is_empty(), "a blob scope accepts something"); accept.sort(); accept.dedup(); let covered = |mime: &MimePattern| { accept .iter() .any(|other| other != mime && other.contains(mime)) }; let keep: Vec<MimePattern> = accept.iter().filter(|m| !covered(m)).cloned().collect(); Scope::Blob { accept: keep } }
/// The `blob:` scope one upload needs: the type it declared. /// /// The type is taken up to any `;` — `image/png; charset=binary` is an /// upload of `image/png` — and one that is not `type/subtype` at all is /// taken as `application/octet-stream`, which is what an unreadable /// content type means anyway. #[must_use] pub fn blob_upload(mime_type: &str) -> Scope { let named = mime_type.split(';').next().unwrap_or_default().trim(); let mime = MimePattern::parse(named) .unwrap_or_else(|_| MimePattern::parse("application/octet-stream").expect("a literal")); Scope::blob(vec![mime]) }
/// The variant this atom is, for [`ScopeSet::narrow`](crate::ScopeSet::narrow)'s same-kind rule. /// /// Not `PartialEq` on the whole scope and not a public type: the only /// question asked of it is whether two atoms are the same *kind* of /// capability, and giving that a name is cheaper than matching on eight /// variants at the one call site. pub(crate) fn kind(&self) -> u8 { match self { Scope::Atproto => 0, Scope::Transition(_) => 1, Scope::Repo { .. } => 2, Scope::Rpc { .. } => 3, Scope::Blob { .. } => 4, Scope::Identity { .. } => 5, Scope::Account { .. } => 6, Scope::Include { .. } => 7, Scope::Unknown(_) => 8, } }}
/// The `aud` that names every audience, as the permission spec writes it.pub(crate) const ANY_AUD: &str = "*";
/// What a printed positional part percent-encodes: what a scope token may/// not hold, `?`, which would begin the parameters, and `%` itself, so a/// value's own escapes survive.const POSITIONAL: &AsciiSet = &CONTROLS.add(b' ').add(b'"').add(b'%').add(b'?').add(b'\\');
/// What a printed parameter value percent-encodes: the same, and the/// characters the parameter syntax reserves. `+` is among them because a/// form decoder reads it as a space.const VALUE: &AsciiSet = &POSITIONAL.add(b'#').add(b'&').add(b'+');
fn aud_contains(a: &Option<String>, b: &Option<String>) -> bool { match (a, b) { (None, _) => true, (Some(_), None) => false, (Some(a), Some(b)) => a == ANY_AUD || a == b, }}
fn intersect_aud(a: &Option<String>, b: &Option<String>) -> Option<Option<String>> { match (a, b) { (None, x) | (x, None) => Some(x.clone()), (Some(a), Some(b)) if a == b => Some(Some(a.clone())), (Some(any), Some(x)) | (Some(x), Some(any)) if any == ANY_AUD => Some(Some(x.clone())), _ => None, }}
impl fmt::Display for Scope { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { Scope::Atproto => write!(f, "atproto"), Scope::Transition(t) => write!(f, "{t}"), Scope::Repo { collection, actions, } => write!(f, "repo:{collection}{actions}"), Scope::Rpc { method, aud } => { write!(f, "rpc:{method}")?; if let Some(aud) = aud { write!(f, "?aud={}", utf8_percent_encode(aud, VALUE))?; } Ok(()) } Scope::Blob { accept } => match accept.as_slice() { [only] => write!( f, "blob:{}", utf8_percent_encode(&only.to_string(), POSITIONAL) ), many => { write!(f, "blob")?; let mut sep = '?'; for mime in many { let mime = mime.to_string(); write!(f, "{sep}accept={}", utf8_percent_encode(&mime, VALUE))?; sep = '&'; } Ok(()) } }, Scope::Identity { attr } => write!(f, "identity:{attr}"), Scope::Account { attr, action } => { write!(f, "account:{attr}")?; if *action == AccountAction::Manage { write!(f, "?action=manage")?; } Ok(()) } Scope::Include { nsid, aud } => { write!(f, "include:{}", utf8_percent_encode(nsid, POSITIONAL))?; if let Some(aud) = aud { write!(f, "?aud={}", utf8_percent_encode(aud, VALUE))?; } Ok(()) } Scope::Unknown(atom) => f.write_str(atom), } }}