//! Parsing implementation for Tor microdescriptors.

//!

//! A "microdescriptor" is an incomplete, infrequently-changing

//! summary of a relay's information that is generated by

//! the directory authorities.

//!

//! Microdescriptors are much smaller than router descriptors, and

//! change less frequently. For this reason, they're currently used

//! for building circuits by all relays and clients.

//!

//! Microdescriptors can't be used on their own: you need to know

//! which relay they are for, which requires a valid consensus

//! directory.

use crate::parse::keyword::Keyword;

use crate::parse::parser::SectionRules;

use crate::parse::tokenize::{ItemResult, NetDocReader};

use crate::types::family::{RelayFamily, RelayFamilyId, RelayFamilyIds};

use crate::types::misc::*;

use crate::types::policy::PortPolicy;

use crate::util;

use crate::util::PeekableIterator;

use crate::util::str::Extent;

use crate::{AllowAnnotations, Error, NetdocErrorKind as EK, Result};

use tor_error::internal;

use tor_llcrypto::d;

use tor_llcrypto::pk::{curve25519, ed25519, rsa};

use derive_deftly::Deftly;

use digest::Digest;

use std::str::FromStr as _;

use std::sync::Arc;

use std::sync::LazyLock;

use std::time;

#[cfg(feature = "build_docs")]

mod build;

#[cfg(feature = "build_docs")]

pub use build::MicrodescBuilder;

/// Length of a router microdescriptor digest

pub const DOC_DIGEST_LEN: usize = 32;

/// Annotations prepended to a microdescriptor that has been stored to

/// disk.

#[allow(dead_code)]

#[derive(Clone, Debug, Default)]

pub struct MicrodescAnnotation {

    /// A time at which this microdescriptor was last listed in some

    /// consensus document.

    last_listed: Option<time::SystemTime>,

}

/// The digest of a microdescriptor as used in microdesc consensuses

pub type MdDigest = [u8; DOC_DIGEST_LEN];

/// A single microdescriptor.

///

/// <https://spec.torproject.org/dir-spec/computing-microdescriptors.html>

#[derive(Clone, Debug, Deftly, PartialEq, Eq)]

#[derive_deftly(NetdocParseable)]

#[non_exhaustive]

pub struct Microdesc {

    /// The legacy onion key, whose object is optional but whose item serves

    /// as the intro line for these kind of descriptors.

    ///

    /// Let's keep this private for now to prevent interfacing applications

    /// from generating microdesc's with an onion-key; they are not necessary

    /// anymore and just waste space.

    onion_key: OnionKeyIntro,

    /// Public key used for the ntor circuit extension protocol.

    #[deftly(netdoc(single_arg))]

    pub ntor_onion_key: Curve25519Public,

    /// Declared family for this relay.

    #[deftly(netdoc(default))]

    pub family: Arc<RelayFamily>,

    /// Family identities for this relay.

    #[deftly(netdoc(default))]

    pub family_ids: RelayFamilyIds,

    /// List of IPv4 ports to which this relay will exit

    #[deftly(netdoc(keyword = "p", default))]

    pub ipv4_policy: Arc<PortPolicy>,

    /// List of IPv6 ports to which this relay will exit

    #[deftly(netdoc(keyword = "p6", default))]

    pub ipv6_policy: Arc<PortPolicy>,

    /// Ed25519 identity for this relay

    // TODO SPEC: Set this to "exactly once".

    #[deftly(netdoc(keyword = "id", with = "Ed25519IdentityLine"))]

    pub ed25519_id: Ed25519IdentityLine,

    // addr is obsolete and doesn't go here any more

    // pr is obsolete and doesn't go here any more.

    /// The SHA256 digest of the text of this microdescriptor.  This

    /// value is used to identify the microdescriptor when downloading

    /// it, and when listing it in a consensus document.

    // TODO: maybe this belongs somewhere else. Once it's used to store

    // correlate the microdesc to a consensus, it's never used again.

    #[deftly(netdoc(skip))]

    pub sha256: MdDigest,

}

impl Microdesc {

    /// Create a new MicrodescBuilder that can be used to construct

    /// microdescriptors.

    ///

    /// This function is only available when the crate is built with the

    /// `build_docs` feature.

    ///

    /// # Limitations

    ///

    /// The generated microdescriptors cannot yet be encoded, and do

    /// not yet have correct sha256 digests. As such they are only

    /// useful for testing.

    #[cfg(feature = "build_docs")]

    /// Return the sha256 digest of this microdesc.

    /// Return the ntor onion key for this microdesc

    /// Return the ipv4 exit policy for this microdesc

    /// Return the ipv6 exit policy for this microdesc

    /// Return the relay family for this microdesc

    /// Return the ed25519 identity for this microdesc, if its

    /// Ed25519 identity is well-formed.

    /// Return a list of family ids for this microdesc.

}

/// Intro line for a [`Microdesc`].

///

/// The object (the onion key) is deprecated and optional, but the item itself

/// must be present, because it is used to mark the start of the netdoc.

#[derive(Debug, Clone, Default, Deftly, PartialEq, Eq)]

#[derive_deftly(ItemValueParseable)]

struct OnionKeyIntro(#[deftly(netdoc(object))] Option<rsa::PublicKey>);

/// A microdescriptor annotated with additional data

///

/// TODO: rename this.

#[allow(dead_code)]

#[derive(Clone, Debug)]

pub struct AnnotatedMicrodesc {

    /// The microdescriptor

    md: Microdesc,

    /// The annotations for the microdescriptor

    ann: MicrodescAnnotation,

    /// Where did we find the microdescriptor with the originally parsed

    /// string?

    location: Option<Extent>,

}

impl AnnotatedMicrodesc {

    /// Consume this annotated microdesc and discard its annotations.

    /// Return a reference to the microdescriptor within this annotated

    /// microdescriptor.

    /// If this Microdesc was parsed from `s`, return its original text.

}

decl_keyword! {

    /// Keyword type for recognized objects in microdescriptors.

    MicrodescKwd {

        annotation "@last-listed" => ANN_LAST_LISTED,

        "onion-key" => ONION_KEY,

        "ntor-onion-key" => NTOR_ONION_KEY,

        "family" => FAMILY,

        "family-ids" => FAMILY_IDS,

        "p" => P,

        "p6" => P6,

        "id" => ID,

    }

}

/// Rules about annotations that can appear before a Microdescriptor

    use MicrodescKwd::*;

    // unrecognized annotations are okay; anything else is a bug in this

    // context.

/// Rules about entries that must appear in an Microdesc, and how they must

/// be formed.

    use MicrodescKwd::*;

impl MicrodescAnnotation {

    /// Extract a (possibly empty) microdescriptor annotation from a

    /// reader.

    #[allow(dead_code)]

        use MicrodescKwd::*;

        };

}

impl Microdesc {

    /// Parse a string into a new microdescriptor.

    /// Extract a single microdescriptor from a NetDocReader.

        use MicrodescKwd::*;

        // We'll pause at the next annotation, or at the _second_ onion key.

                    } else {

                    }

            }

        // We have to start with onion-key

            // unwrap here is safe because parsing would have failed

            // had there not been at least one item.

            #[allow(clippy::unwrap_used)]

            // Unwrap is safe here because we are parsing these strings from s

            #[allow(clippy::unwrap_used)]

        };

        // Legacy (tap) onion key.  We parse this to make sure it's well-formed,

        // but then we discard it immediately, since we never want to use it.

        //

        // In microdescriptors, the ONION_KEY field is mandatory, but its

        // associated object is optional.

        {

        }

        // Ntor onion key

        // family

        //

        // (We don't need to add the relay's own ID to this family, as we do in

        // RouterDescs: the authorities already took care of that for us.)

        // Family ids (happy families case).

        // exit policies.

        // ed25519 identity

                None => {

                }

                },

            }

        };

            // unwrap here is safe because parsing would have failed

            // had there not been at least one item.

            #[allow(clippy::unwrap_used)]

        };

}

/// Consume tokens from 'reader' until the next token is the beginning

/// of a microdescriptor: an annotation or an ONION_KEY.  If no such

/// token exists, advance to the end of the reader.

    use MicrodescKwd::*;

    loop {

            }

            None => {

            }

        };

    }

/// An iterator that parses one or more (possibly annotated)

/// microdescriptors from a string.

#[derive(Debug)]

pub struct MicrodescReader<'a> {

    /// True if we accept annotations; false otherwise.

    annotated: bool,

    /// An underlying reader to give us Items for the microdescriptors

    reader: NetDocReader<'a, MicrodescKwd>,

}

impl<'a> MicrodescReader<'a> {

    /// Construct a MicrodescReader to take microdescriptors from a string

    /// 's'.

    /// If we're annotated, parse an annotation from the reader. Otherwise

    /// return a default annotation.

        } else {

        }

    /// Parse a (possibly annotated) microdescriptor from the reader.

    ///

    /// On error, parsing stops after the first failure.

    /// Parse a (possibly annotated) microdescriptor from the reader.

    ///

    /// On error, advance the reader to the start of the next microdescriptor.

}

impl<'a> Iterator for MicrodescReader<'a> {

    type Item = Result<AnnotatedMicrodesc>;

        // If there is no next token, we're at the end.

        Some(

        )

}

#[cfg(test)]

mod test {

    // @@ begin test lint list maintained by maint/add_warning @@

    #![allow(clippy::bool_assert_comparison)]

    #![allow(clippy::clone_on_copy)]

    #![allow(clippy::dbg_macro)]

    #![allow(clippy::mixed_attributes_style)]

    #![allow(clippy::print_stderr)]

    #![allow(clippy::print_stdout)]

    #![allow(clippy::single_char_pattern)]

    #![allow(clippy::unwrap_used)]

    #![allow(clippy::unchecked_time_subtraction)]

    #![allow(clippy::useless_vec)]

    #![allow(clippy::needless_pass_by_value)]

    //! <!-- @@ end test lint list maintained by maint/add_warning @@ -->

    use super::*;

    use hex_literal::hex;

    const TESTDATA: &str = include_str!("../../testdata/microdesc1.txt");

    const TESTDATA2: &str = include_str!("../../testdata/microdesc2.txt");

    const TESTDATA3: &str = include_str!("../../testdata/microdesc3.txt");

    const TESTDATA4: &str = include_str!("../../testdata/microdesc4.txt");

    fn read_bad(fname: &str) -> String {

        use std::fs;

        use std::path::PathBuf;

        let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));

        path.push("testdata");

        path.push("bad-mds");

        path.push(fname);

        fs::read_to_string(path).unwrap()

    }

    #[test]

    fn parse_single() -> Result<()> {

        let _md = Microdesc::parse(TESTDATA)?;

        Ok(())

    }

    #[test]

    fn parse_no_tap_key() -> Result<()> {

        let _md = Microdesc::parse(TESTDATA3)?;

        Ok(())

    }

    #[test]

    fn parse_multi() -> Result<()> {

        use humantime::parse_rfc3339;

        let mds: Result<Vec<_>> =

            MicrodescReader::new(TESTDATA2, &AllowAnnotations::AnnotationsAllowed)?.collect();

        let mds = mds?;

        assert_eq!(mds.len(), 4);

        assert_eq!(

            mds[0].ann.last_listed.unwrap(),

            parse_rfc3339("2020-01-27T18:52:09Z").unwrap()

        );

        assert_eq!(

            mds[0].md().digest(),

            &hex!("38c71329a87098cb341c46c9c62bd646622b4445f7eb985a0e6adb23a22ccf4f")

        );

        assert_eq!(

            mds[0].md().ntor_key().as_bytes(),

            &hex!("5e895d65304a3a1894616660143f7af5757fe08bc18045c7855ee8debb9e6c47")

        );

        assert!(mds[0].md().ipv4_policy().allows_port(993));

        assert!(mds[0].md().ipv6_policy().allows_port(993));

        assert!(!mds[0].md().ipv4_policy().allows_port(25));

        assert!(!mds[0].md().ipv6_policy().allows_port(25));

        assert_eq!(

            mds[0].md().ed25519_id().as_bytes(),

            &hex!("2d85fdc88e6c1bcfb46897fca1dba6d1354f93261d68a79e0b5bc170dd923084")

        );

        Ok(())

    }

    #[test]

    fn parse_family_ids() -> Result<()> {

        let mds: Vec<AnnotatedMicrodesc> =

            MicrodescReader::new(TESTDATA4, &AllowAnnotations::AnnotationsNotAllowed)?

                .collect::<Result<_>>()?;

        assert_eq!(mds.len(), 2);

        let md0 = mds[0].md();

        let md1 = mds[1].md();

        assert!(md0.family_ids().is_empty());

        assert_eq!(

            md1.family_ids(),

            &[

                "ed25519:dXMgdGhlIHRyaXVtcGguICAgIC1UaG9tYXMgUGFpbmU"

                    .parse()

                    .unwrap(),

                "other:Example".parse().unwrap()

            ]

        );

        assert!(matches!(md1.family_ids()[0], RelayFamilyId::Ed25519(_)));

        Ok(())

    }

    #[test]

    fn test_bad() {

        use crate::Pos;

        use crate::types::policy::PolicyError;

        fn check(fname: &str, e: &Error) {

            let content = read_bad(fname);

            let res = Microdesc::parse(&content);

            assert!(res.is_err());

            assert_eq!(&res.err().unwrap(), e);

        }

        check(

            "wrong-start",

            &EK::WrongStartingToken

                .with_msg("family")

                .at_pos(Pos::from_line(1, 1)),

        );

        check(

            "bogus-policy",

            &EK::BadPolicy

                .at_pos(Pos::from_line(9, 1))

                .with_source(PolicyError::InvalidPort),

        );

        check("wrong-id", &EK::MissingToken.with_msg("id ed25519"));

    }

    #[test]

    fn test_recover() -> Result<()> {

        let mut data = read_bad("wrong-start");

        data += TESTDATA;

        data += &read_bad("wrong-id");

        let res: Vec<Result<_>> =

            MicrodescReader::new(&data, &AllowAnnotations::AnnotationsAllowed)?.collect();

        assert_eq!(res.len(), 3);

        assert!(res[0].is_err());

        assert!(res[1].is_ok());

        assert!(res[2].is_err());

        Ok(())

    }

    /// Checks whether parse2 works on [`Microdesc`].

    ///

    /// Certain values such as public keys are hardcoded and can be simply

    /// replaced by a copy and paste in the case one replaces the testdata2

    /// vector's in the future.

    #[test]

    fn parse2() {

        use tor_llcrypto::pk::ed25519::Ed25519Identity;

        use crate::parse2;

        let md = include_str!("../../testdata2/cached-microdescs.new");

        let mds = parse2::parse_netdoc_multiple::<Microdesc>(&parse2::ParseInput::new(

            md,

            "../../testdata2/cached-microdescs.new",

        ))

        .unwrap();

        assert_eq!(mds.len(), 7);

        assert_eq!(

            mds[0],

            Microdesc {

                onion_key: OnionKeyIntro(rsa::PublicKey::from_der(

                    pem::parse(

                        "

-----BEGIN RSA PUBLIC KEY-----

MIGJAoGBANF8Zgxp8amY1esYdPj2Ada1ORiVB/A4sgKLQ5ij/wsasO3yjjLcvHRB

UJ0mAQWql/nauvjnKUeZFcGm3t7q0v3F9uUsOGTAZ/IKh31UQAm5OS/TJyf8IHky

Yl0wCKpUZFHs5CHsajLSfXZKHkwfqRXFEJu9aMtmQdQFfqE9JOJHAgMBAAE=

-----END RSA PUBLIC KEY-----

                        "

                    )

                    .unwrap()

                    .contents()

                )),

                sha256: [0; 32],

                ntor_onion_key: curve25519::PublicKey::from(<[u8; 32]>::from(

                    FixedB64::<32>::from_str("I1S8JfcqPPHWVTxfjq/eGmGiu/OtR+fF0Z86Ge1mq3s")

                        .unwrap()

                ))

                .into(),

                family: Default::default(),

                ipv4_policy: Default::default(),

                ipv6_policy: Default::default(),

                ed25519_id: Ed25519Identity::from(<[u8; 32]>::from(

                    FixedB64::<32>::from_str("yhO6nETO5AUdvJbLgPnw4mFjozGXWMCqOp30nY6nM8E")

                        .unwrap()

                ))

                .into(),

                family_ids: Default::default(),

            }

        );

    }

    /// Manual test for happy families.

    // TODO: This should be included in testdata2/ but that would require the

    // chutney/shadow integration test to actually do families at all.

    #[test]

    fn parse2_happy_family() {

        use tor_llcrypto::pk::ed25519::Ed25519Identity;

        use crate::parse2::{self, ParseInput};

        use std::iter;

        // A microdescriptor taken from the wild containing happy families.

        const MICRODESC: &str = "\

onion-key

-----BEGIN RSA PUBLIC KEY-----

MIGJAoGBAMk57F7qGHVadBJ6m4028w13I1Qk67Ee0JU88w7NObKBph3DQYjgYs4e

eUdiW4Gdsx8w/xOuK0foCo0O8Iqq5MXtVcpUP/N+5uB7SVvGdJFsKw21KdIc6v8g

ACZAijw5ZPOdhLbyLQyFHNV8zXUov1dlx/Fb9M3lPMVevnDbuKM5AgMBAAE=

-----END RSA PUBLIC KEY-----

ntor-onion-key fhhP23UKD4L2jehA5gopAo5b6NSoB+kZN5Q4ULv3Zww

family $4CFFD403DAB89A689F3FDB80B5366E46D879E736 $4D6C1486939A42D7FFE69BCD9F3FDAA86C743433 $73955E6A69BA5E0827F48206CAD78C045BBE8873 $8DBA9ADCA5B3A3AB6D2B4F88AC2F96614D33DAB3 $B29E3E30443F897F48B86765F1BC1DB917F5DF46 $CD642E7E722979580B6D631697772C0B72BCF25C $D9E7B6A73C8278274081B77D373ECCE4552E75FB $F2515315FE0DB7456194CABC503B526B49951415

family-ids ed25519:b54cKgML0ykRyhdIRcq1xtW19iEVsMYnGNbdY+vvcas

id ed25519 /MU/FVKRGcZAy8XFnzLS6Dgcg6s1VpYeFjkwb6+CVhw

";

        let md = parse2::parse_netdoc::<Microdesc>(&ParseInput::new(MICRODESC, "")).unwrap();

        assert_eq!(

            md.family_ids,

            RelayFamilyIds::from_iter(iter::once(RelayFamilyId::Ed25519(

                Ed25519Identity::from_base64("b54cKgML0ykRyhdIRcq1xtW19iEVsMYnGNbdY+vvcas")

                    .unwrap()

            )))

        );

    }

}