#![cfg_attr(docsrs, feature(doc_cfg))]

#![doc = include_str!("../README.md")]

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

#![allow(renamed_and_removed_lints)] // @@REMOVE_WHEN(ci_arti_stable)

#![allow(unknown_lints)] // @@REMOVE_WHEN(ci_arti_nightly)

#![warn(missing_docs)]

#![warn(noop_method_call)]

#![warn(unreachable_pub)]

#![warn(clippy::all)]

#![deny(clippy::await_holding_lock)]

#![deny(clippy::cargo_common_metadata)]

#![deny(clippy::cast_lossless)]

#![deny(clippy::checked_conversions)]

#![warn(clippy::cognitive_complexity)]

#![deny(clippy::debug_assert_with_mut_call)]

#![deny(clippy::exhaustive_enums)]

#![deny(clippy::exhaustive_structs)]

#![deny(clippy::expl_impl_clone_on_copy)]

#![deny(clippy::fallible_impl_from)]

#![deny(clippy::implicit_clone)]

#![deny(clippy::large_stack_arrays)]

#![warn(clippy::manual_ok_or)]

#![deny(clippy::missing_docs_in_private_items)]

#![warn(clippy::needless_borrow)]

#![warn(clippy::needless_pass_by_value)]

#![warn(clippy::option_option)]

#![deny(clippy::print_stderr)]

#![deny(clippy::print_stdout)]

#![warn(clippy::rc_buffer)]

#![deny(clippy::ref_option_ref)]

#![warn(clippy::semicolon_if_nothing_returned)]

#![warn(clippy::trait_duplication_in_bounds)]

#![deny(clippy::unchecked_time_subtraction)]

#![deny(clippy::unnecessary_wraps)]

#![warn(clippy::unseparated_literal_suffix)]

#![deny(clippy::unwrap_used)]

#![deny(clippy::mod_module_files)]

#![allow(clippy::let_unit_value)] // This can reasonably be done for explicitness

#![allow(clippy::uninlined_format_args)]

#![allow(clippy::significant_drop_in_scrutinee)] // arti/-/merge_requests/588/#note_2812945

#![allow(clippy::result_large_err)] // temporary workaround for arti#587

#![allow(clippy::needless_raw_string_hashes)] // complained-about code is fine, often best

#![allow(clippy::needless_lifetimes)] // See arti#1765

#![allow(mismatched_lifetime_syntaxes)] // temporary workaround for arti#2060

#![allow(clippy::collapsible_if)] // See arti#2342

#![deny(clippy::unused_async)]

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

use std::sync::{Arc, Mutex};

use arti_client::{IntoTorAddr, TorClient};

use ureq::{

    http::{Uri, uri::Scheme},

    tls::TlsProvider as UreqTlsProvider,

    unversioned::{

        resolver::{ArrayVec, ResolvedSocketAddrs, Resolver as UreqResolver},

        transport::{Buffers, Connector as UreqConnector, LazyBuffers, NextTimeout, Transport},

    },

};

use educe::Educe;

use thiserror::Error;

use tor_proto::client::stream::{DataReader, DataWriter};

use tor_rtcompat::{Runtime, ToplevelBlockOn};

#[cfg(feature = "rustls")]

use ureq::unversioned::transport::RustlsConnector;

#[cfg(feature = "native-tls")]

use ureq::unversioned::transport::NativeTlsConnector;

use futures::io::{AsyncReadExt, AsyncWriteExt};

/// High-level functionality for accessing the Tor network as a client.

pub use arti_client;

/// Compatibility between different async runtimes for Arti.

pub use tor_rtcompat;

/// Underlying HTTP/S client library.

pub use ureq;

/// **Default usage**: Returns an instance of [`ureq::Agent`] using the default [`Connector`].

///

/// Equivalent to `Connector::new()?.agent()`.

///

/// # Example

///

/// ```rust,no_run

/// arti_ureq::default_agent()

///     .expect("Failed to create default agent.")

///     .get("http://check.torproject.org/api/ip")

///     .call()

///     .expect("Failed to make request.");

/// ```

///

/// Warning: This method creates a default [`arti_client::TorClient`]. Using multiple concurrent

/// instances of `TorClient` is not recommended. Most programs should create a single `TorClient` centrally.

/// **Main entrypoint**: Object for making HTTP/S requests through Tor.

///

/// This type embodies an [`arti_client::TorClient`] and implements [`ureq::unversioned::transport::Connector`],

/// allowing HTTP/HTTPS requests to be made with `ureq` over Tor.

///

/// Also bridges between async I/O (in Arti and Tokio) and sync I/O (in `ureq`).

///

/// ## A `Connector` object can be constructed in different ways.

///

/// ### 1. Use [`Connector::new`] to create a `Connector` with a default `TorClient`.

/// ```rust,no_run

/// let connector = arti_ureq::Connector::new().expect("Failed to create Connector.");

/// ```

///

/// ### 2. Use [`Connector::with_tor_client`] to create a `Connector` with a specific `TorClient`.

/// ```rust,no_run

/// let tor_client = arti_client::TorClient::with_runtime(

///     tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime.")

/// )

/// .create_unbootstrapped()

/// .expect("Error creating Tor Client.");

///

/// let connector = arti_ureq::Connector::with_tor_client(tor_client);

/// ```

///

/// ### 3. Use [`Connector::builder`] to create a `ConnectorBuilder` and configure a `Connector` with it.

/// ```rust,no_run

/// let connector = arti_ureq::Connector::<tor_rtcompat::PreferredRuntime>::builder()

///    .expect("Failed to create ConnectorBuilder.")

///    .build()

///    .expect("Failed to create Connector.");

/// ```

///

///

/// ## Usage of `Connector`.

///

/// A `Connector` can be used to retrieve an [`ureq::Agent`] with [`Connector::agent`] or pass the `Connector`

/// to [`ureq::Agent::with_parts`] along with a custom [`ureq::config::Config`] and a resolver

/// obtained from [`Connector::resolver`] to retrieve a more configurable [`ureq::Agent`].

///

/// ### Retrieve an `ureq::Agent`.

/// ```rust,no_run

/// let connector = arti_ureq::Connector::new().expect("Failed to create Connector.");

/// let ureq_agent = connector.agent();

/// ```

///

/// ### Pass as argument to `ureq::Agent::with_parts`.

///

/// We highly advice only using `Resolver` instead of e.g `ureq`'s [`ureq::unversioned::resolver::DefaultResolver`] to avoid DNS leaks.

///

/// ```rust,no_run

/// let connector = arti_ureq::Connector::new().expect("Failed to create Connector.");

/// let resolver = connector.resolver();

///

/// let ureq_agent = ureq::Agent::with_parts(

///    ureq::config::Config::default(),

///    connector,

///    resolver,

/// );

/// ```

#[derive(Educe)]

#[educe(Debug)]

pub struct Connector<R: Runtime> {

    /// [`arti_client::TorClient`] used to make requests.

    #[educe(Debug(ignore))]

    client: TorClient<R>,

    /// Selected [`ureq::tls::TlsProvider`]. Possible options are `Rustls` or `NativeTls`. The default is `Rustls`.

    tls_provider: UreqTlsProvider,

}

/// Object for constructing a [`Connector`].

///

/// Returned by [`Connector::builder`].

///

/// # Example

///

/// ```rust,no_run

/// // `Connector` using `NativeTls` as Tls provider.

/// let arti_connector = arti_ureq::Connector::<tor_rtcompat::PreferredRuntime>::builder()

///    .expect("Failed to create ConnectorBuilder.")

///     .tls_provider(ureq::tls::TlsProvider::NativeTls)

///     .build()

///     .expect("Failed to create Connector.");

///

/// // Retrieve `ureq::Agent` from the `Connector`.

/// let ureq_agent = arti_connector.agent();

/// ```

pub struct ConnectorBuilder<R: Runtime> {

    /// Configured [`arti_client::TorClient`] to be used with [`Connector`].

    client: Option<TorClient<R>>,

    /// Runtime

    ///

    /// If `client` is `None`, is used to create one.

    /// If `client` is `Some`. we discard this in `.build()` in favour of `.client.runtime()`.

    //

    // (We could replace `client` and `runtime` with `Either<TorClient<R>, R>` or some such,

    // but that would probably be more confusing.)

    runtime: R,

    /// Custom selected TlsProvider. Default is `Rustls`. Possible options are `Rustls` or `NativeTls`.

    tls_provider: Option<UreqTlsProvider>,

}

/// Custom [`ureq::unversioned::transport::Transport`] enabling `ureq` to use

/// [`arti_client::TorClient`] for making requests over Tor.

#[derive(Educe)]

#[educe(Debug)]

struct HttpTransport<R: Runtime> {

    /// Reader handle to Arti's read stream.

    // TODO #1859

    r: Arc<Mutex<DataReader>>,

    /// Writer handle to Arti's write stream.

    w: Arc<Mutex<DataWriter>>, // TODO #1859

    /// Buffer to store data.

    #[educe(Debug(ignore))]

    buffer: LazyBuffers,

    /// Runtime used to bridge between sync (`ureq`) and async I/O (`arti`).

    rt: R,

}

/// Resolver implementing trait [`ureq::unversioned::resolver::Resolver`].

///

/// Resolves the host to an IP address using [`arti_client::TorClient::resolve`] avoiding DNS leaks.

///

/// An instance of [`Resolver`] can easily be retrieved using [`Connector::resolver()`].

///

/// This is needed when using `ureq::Agent::with_parts`,

/// to avoid leaking DNS queries to the public local network.

/// Usually, use [`Connector::agent`] instead,

/// in which case you don't need to deal explicitly with a `Resolver`.

///

/// # Example

///

/// ```rust,no_run

/// // Retrieve the resolver directly from your `Connector`.

/// let arti_connector = arti_ureq::Connector::new().expect("Failed to create Connector.");

/// let arti_resolver = arti_connector.resolver();

/// let ureq_agent = ureq::Agent::with_parts(

///     ureq::config::Config::default(),

///     arti_connector,

///     arti_resolver,

/// );

/// ```

#[derive(Educe)]

#[educe(Debug)]

pub struct Resolver<R: Runtime> {

    /// [`arti_client::TorClient`] which contains the method [`arti_client::TorClient::resolve`].

    ///

    /// Use [`Connector::resolver`] or pass the client from your `Connector` to create an instance of `Resolver`.

    #[educe(Debug(ignore))]

    client: TorClient<R>,

}

/// Error making or using http connection.

#[derive(Error, Debug)]

#[non_exhaustive]

pub enum Error {

    /// Unsupported URI scheme.

    #[error("unsupported URI scheme in {uri:?}")]

    UnsupportedUriScheme {

        /// URI.

        uri: Uri,

    },

    /// Missing hostname.

    #[error("Missing hostname in {uri:?}")]

    MissingHostname {

        /// URI.

        uri: Uri,

    },

    /// Tor connection failed.

    #[error("Tor connection failed")]

    Arti(#[from] arti_client::Error),

    /// General I/O error.

    #[error("General I/O error")]

    Io(#[from] std::io::Error),

    /// TLS configuration mismatch.

    #[error("TLS provider in config does not match the one in Connector.")]

    TlsConfigMismatch,

}

// Map our own error kinds to Arti's error classification.

impl tor_error::HasKind for Error {

    #[rustfmt::skip]

        use tor_error::ErrorKind as EK;

        }

}

// Convert our own error type to ureq's error type.

impl std::convert::From<Error> for ureq::Error {

            }

            }

            Error::TlsConfigMismatch => {

            }

        }

}

// Implementation of trait [`ureq::unversioned::transport::Transport`] for [`HttpTransport`].

//

// Due to this implementation [`Connector`] can have a valid transport to be used with `ureq`.

//

// In this implementation we map the `ureq` buffer to the `arti` stream. And map the

// methods to receive and transmit data between `ureq` and `arti`.

//

// Here we also bridge between the sync context `ureq` is usually called from and Arti's async I/O

// by blocking the provided runtime. Preferably a runtime only used for `arti` should be provided.

impl<R: Runtime + ToplevelBlockOn> Transport for HttpTransport<R> {

    // Obtain buffers used by ureq.

    // Write received data from ureq request to arti stream.

    // Read data from arti stream to ureq buffer.

    // Check if the connection is open.

        // We use `TorClient::connect` without `StreamPrefs::optimistic`,

        // so `.is_connected()` tells us whether the stream has *ceased to be* open;

        // i.e., we don't risk returning `false` because the stream isn't open *yet*.

}

impl ConnectorBuilder<tor_rtcompat::PreferredRuntime> {

    /// Returns instance of [`ConnectorBuilder`] with default values.

        Ok(ConnectorBuilder {

        })

}

impl<R: Runtime> ConnectorBuilder<R> {

    /// Creates instance of [`Connector`] from the builder.

        };

    /// Creates new [`Connector`] with an explicitly specified [`tor_rtcompat::Runtime`].

    ///

    /// The value `runtime` is only used if no [`arti_client::TorClient`] is configured using [`ConnectorBuilder::tor_client`].

    /// Configure a custom Tor client to be used with [`Connector`].

    ///

    /// Will also cause `client`'s `Runtime` to be used (obtained via [`TorClient::runtime()`]).

    ///

    /// If the client isn't `TorClient<PreferredRuntime>`, use [`ConnectorBuilder::with_runtime()`]

    /// to create a suitable `ConnectorBuilder`.

    /// Configure the TLS provider to be used with [`Connector`].

}

// Implementation of trait [`ureq::unversioned::resolver::Resolver`] for [`Resolver`].

//

// `Resolver` can be used in [`ureq::Agent::with_parts`] to resolve the host to an IP address.

//

// Uses [`arti_client::TorClient::resolve`].

//

// We highly advice only using `Resolver` instead of e.g `ureq`'s [`ureq::unversioned::resolver::DefaultResolver`] to avoid DNS leaks.

impl<R: Runtime + ToplevelBlockOn> UreqResolver for Resolver<R> {

    /// Method to resolve the host to an IP address using `arti_client::TorClient::resolve`.

        // We just retrieve the IP addresses using `arti_client::TorClient::resolve` and output

        // it in a format that ureq can use.

}

impl<R: Runtime + ToplevelBlockOn> Connector<R> {

    /// Creates new instance with the provided [`arti_client::TorClient`].

}

impl<R: Runtime + ToplevelBlockOn> UreqConnector<()> for Connector<R> {

    type Out = Box<dyn Transport>;

    /// Makes a connection using the Tor client.

    ///

    /// Returns a `HttpTransport` which implements trait [`ureq::unversioned::transport::Transport`].

        // Retrieve host and port from the ConnectionDetails.

        // Convert to an address we can use to connect over the Tor network.

        // Retrieve stream from Tor connection.

        // Return a HttpTransport with a reader and writer to the stream.

}

impl Connector<tor_rtcompat::PreferredRuntime> {

    /// Returns new `Connector` with default values.

    ///

    /// To configure a non-default `Connector`,

    /// use [`ConnectorBuilder`].

    ///

    /// Warning: This method creates a default [`arti_client::TorClient`]. Using multiple concurrent

    /// instances of `TorClient` is not recommended. Most programs should create a single `TorClient` centrally.

}

impl<R: Runtime + ToplevelBlockOn> Connector<R> {

    /// Returns instance of [`Resolver`] implementing trait [`ureq::unversioned::resolver::Resolver`].

    /// Returns instance of [`ureq::Agent`].

    ///

    /// Equivalent to using [`ureq::Agent::with_parts`] with the default [`ureq::config::Config`]

    /// and this `Connector` and the resolver obtained from [`Connector::resolver()`].

    ///

    /// # Example

    ///

    /// ```rust,no_run

    /// let ureq_agent = arti_ureq::Connector::new()

    ///     .expect("Failed to create Connector")

    ///     .agent();

    ///

    /// // Use the agent to make a request.

    /// ureq_agent

    ///     .get("https://check.torproject.org/api/ip")

    ///     .call()

    ///     .expect("Failed to make request.");

    /// ```

            )

    /// Returns instance of [`ureq::Agent`] using the provided [`ureq::config::Config`].

    ///

    /// Equivalent to [`Connector::agent`] but allows the user to provide a custom [`ureq::config::Config`].

    /// Returns connector chain depending on features flag.

        #[cfg(feature = "rustls")]

        #[cfg(feature = "native-tls")]

}

/// Returns the default [`ureq::tls::TlsProvider`] based on the features flag.

    } else {

    }

/// Implementation to make [`ConnectorBuilder`] accessible from [`Connector`].

///

/// # Example

///

/// ```rust,no_run

/// let rt = tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime.");

/// let tls_provider = arti_ureq::get_default_tls_provider();

///

/// let client = arti_client::TorClient::with_runtime(rt.clone())

///     .create_unbootstrapped()

///     .expect("Error creating Tor Client.");

///

/// let builder = arti_ureq::ConnectorBuilder::<tor_rtcompat::PreferredRuntime>::new()

///     .expect("Failed to create ConnectorBuilder.")

///     .tor_client(client)

///     .tls_provider(tls_provider);

///

/// let arti_connector = builder.build();

/// ```

impl Connector<tor_rtcompat::PreferredRuntime> {

    /// Returns new [`ConnectorBuilder`] with default values.

}

/// Parse the URI.

///

/// Obtain the host and port.

#[cfg(test)]

mod arti_ureq_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 arti_client::config::TorClientConfigBuilder;

    use std::str::FromStr;

    use test_temp_dir::test_temp_dir;

    const ARTI_TEST_LIVE_NETWORK: &str = "ARTI_TEST_LIVE_NETWORK";

    const ARTI_TESTING_ON_LOCAL: &str = "ARTI_TESTING_ON_LOCAL";

    // Helper function to check if two types are equal. The types in this library are to

    // complex to use the `==` operator or (Partial)Eq. So we compare the types of the individual properties instead.

    // Helper function to check if the environment variable ARTI_TEST_LIVE_NETWORK is set to 1.

    // We only want to run tests using the live network when the user explicitly wants to.

    // Helper function to check if the environment variable ARTI_TESTING_ON_LOCAL is set to 1.

    // Some tests, especially those that create default `Connector` instances, or test the `ConnectorBuilder`,

    // are not reliable when run on CI.  We don't know why that is.  It's probably a bug.  TODO fix the tests!

    // Helper method to allow tests to be ran in a closure.

    // Helper function to make a request to check.torproject.org/api/ip and check if

    // it was done over Tor.

            ))

    // Quick internal test to check if our helper function `equal_types` works as expected.

    // Otherwise our other tests might not be reliable.

    #[test]

    // `Connector::new` should return the default `Connector`.

    // This test is only ran when ARTI_TESTING_ON_LOCAL is set to 1.

    #[test]

    #[cfg(all(feature = "rustls", not(feature = "native-tls")))]

    fn articonnector_new_returns_default() {

        if !testing_on_local() {

            return;

        }

        let actual_connector = Connector::new().expect("Failed to create Connector.");

        let expected_connector = Connector {

            client: TorClient::with_runtime(

                tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime."),

            )

            .create_unbootstrapped()

            .expect("Error creating Tor Client."),

            tls_provider: UreqTlsProvider::Rustls,

        };

        assert_equal_types(&expected_connector, &actual_connector);

        assert_equal_types(

            &actual_connector.client.runtime().clone(),

            &tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime."),

        );

        assert_eq!(

            &actual_connector.tls_provider,

            &ureq::tls::TlsProvider::Rustls,

        );

    }

    // `Connector::with_tor_client` should return a `Connector` with specified Tor client set.

    // This test is only ran when ARTI_TESTING_ON_LOCAL is set to 1.

    #[test]

    #[cfg(all(feature = "rustls", not(feature = "native-tls")))]

    fn articonnector_with_tor_client() {

        if !testing_on_local() {

            return;

        }

        let tor_client = TorClient::with_runtime(

            tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime."),

        )

        .create_unbootstrapped()

        .expect("Error creating Tor Client.");

        let actual_connector = Connector::with_tor_client(tor_client);

        let expected_connector = Connector {

            client: TorClient::with_runtime(

                tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime."),

            )

            .create_unbootstrapped()

            .expect("Error creating Tor Client."),

            tls_provider: UreqTlsProvider::Rustls,

        };

        assert_equal_types(&expected_connector, &actual_connector);

        assert_equal_types(

            &actual_connector.client.runtime().clone(),

            &tor_rtcompat::PreferredRuntime::create().expect("Failed to create runtime."),

        );

        assert_eq!(

            &actual_connector.tls_provider,

            &ureq::tls::TlsProvider::Rustls,

        );

    }

    // The default instance returned by `Connector::builder` should equal to the default `Connector`.

    // This test is only ran when ARTI_TESTING_ON_LOCAL is set to 1.

    #[test]

    // `ConnectorBuilder::with_runtime` should return a `ConnectorBuilder` with the specified runtime set.

    // This test is only ran when ARTI_TESTING_ON_LOCAL is set to 1.

    #[cfg(all(feature = "tokio", feature = "rustls"))]

    #[test]

        )

        );

        )

        );

    // `ConnectorBuilder::tor_client` should return a `Connector` with the specified `TorClient` set.

    #[cfg(all(feature = "tokio", feature = "rustls"))]

    #[test]

            );

    // Test if the method `uri_to_host_port` returns the correct parameters.

    #[test]

    // Test if `arti-ureq` default agent uses Tor to make the request.

    // This test is only ran when ARTI_TEST_LIVE_NETWORK is set to 1.

    #[test]

            true,

        );

    // Test if `arti-ureq` default agent uses Tor to make the request.

    // This test also checks if the Tor API returns false when the request is made with an

    // `ureq` agent that is not configured to use Tor to ensure the test is reliable.

    // This test is only ran when ARTI_TEST_LIVE_NETWORK is set to 1.

    #[test]

    #[cfg(all(feature = "rustls", not(feature = "native-tls")))]

    fn request_goes_over_tor_with_unsafe_check() {

        if !test_live_network() {

            return;

        }

        let is_tor = request_is_tor(ureq::Agent::new_with_defaults(), true);

        assert_eq!(is_tor, false);

        let is_tor = request_is_tor(

            default_agent().expect("Failed to retrieve default agent."),

            true,

        );

        assert_eq!(is_tor, true);

    }

    // Test if the `ureq` client configured with `Connector` uses Tor tor make the request using bare HTTP.

    // This test is only ran when ARTI_TEST_LIVE_NETWORK is set to 1.

    #[test]

    // Test if `get_default_tls_provider` correctly derives the TLS provider from the feature flags.

    #[test]

        #[cfg(feature = "native-tls")]

        #[cfg(not(feature = "native-tls"))]

        assert_eq!(get_default_tls_provider(), UreqTlsProvider::Rustls);

    // Test if configuring the `Connector` using `get_default_tls_provider` correctly sets the TLS provider

    // based on the feature flags.

    // This test is only ran when ARTI_TESTING_ON_LOCAL is set to 1.

    #[test]

        #[cfg(feature = "native-tls")]

            &ureq::tls::TlsProvider::NativeTls,

        );

        #[cfg(not(feature = "native-tls"))]

        assert_eq!(

            &arti_connector.tls_provider,

            &ureq::tls::TlsProvider::Rustls,

        );

}