gio/auto/

tls_database.rs

// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{
    ffi, AsyncResult, Cancellable, SocketConnectable, TlsCertificate, TlsCertificateFlags,
    TlsDatabaseLookupFlags, TlsDatabaseVerifyFlags, TlsInteraction,
};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, pin::Pin};

glib::wrapper! {
    /// `GTlsDatabase` is used to look up certificates and other information
    /// from a certificate or key store. It is an abstract base class which
    /// TLS library specific subtypes override.
    ///
    /// A `GTlsDatabase` may be accessed from multiple threads by the TLS backend.
    /// All implementations are required to be fully thread-safe.
    ///
    /// Most common client applications will not directly interact with
    /// `GTlsDatabase`. It is used internally by [`TlsConnection`][crate::TlsConnection].
    ///
    /// This is an Abstract Base Class, you cannot instantiate it.
    ///
    /// # Implements
    ///
    /// [`TlsDatabaseExt`][trait@crate::prelude::TlsDatabaseExt], [`trait@glib::ObjectExt`]
    #[doc(alias = "GTlsDatabase")]
    pub struct TlsDatabase(Object<ffi::GTlsDatabase, ffi::GTlsDatabaseClass>);

    match fn {
        type_ => || ffi::g_tls_database_get_type(),
    }
}

impl TlsDatabase {
    pub const NONE: Option<&'static TlsDatabase> = None;
}

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::TlsDatabase>> Sealed for T {}
}

/// Trait containing all [`struct@TlsDatabase`] methods.
///
/// # Implementors
///
/// [`TlsDatabase`][struct@crate::TlsDatabase], [`TlsFileDatabase`][struct@crate::TlsFileDatabase]
pub trait TlsDatabaseExt: IsA<TlsDatabase> + sealed::Sealed + 'static {
    /// Create a handle string for the certificate. The database will only be able
    /// to create a handle for certificates that originate from the database. In
    /// cases where the database cannot create a handle for a certificate, [`None`]
    /// will be returned.
    ///
    /// This handle should be stable across various instances of the application,
    /// and between applications. If a certificate is modified in the database,
    /// then it is not guaranteed that this handle will continue to point to it.
    /// ## `certificate`
    /// certificate for which to create a handle.
    ///
    /// # Returns
    ///
    /// a newly allocated string containing the
    /// handle.
    #[doc(alias = "g_tls_database_create_certificate_handle")]
    fn create_certificate_handle(
        &self,
        certificate: &impl IsA<TlsCertificate>,
    ) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::g_tls_database_create_certificate_handle(
                self.as_ref().to_glib_none().0,
                certificate.as_ref().to_glib_none().0,
            ))
        }
    }

    /// Look up a certificate by its handle.
    ///
    /// The handle should have been created by calling
    /// g_tls_database_create_certificate_handle() on a #GTlsDatabase object of
    /// the same TLS backend. The handle is designed to remain valid across
    /// instantiations of the database.
    ///
    /// If the handle is no longer valid, or does not point to a certificate in
    /// this database, then [`None`] will be returned.
    ///
    /// This function can block, use g_tls_database_lookup_certificate_for_handle_async() to perform
    /// the lookup operation asynchronously.
    /// ## `handle`
    /// a certificate handle
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// Flags which affect the lookup.
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    ///
    /// # Returns
    ///
    /// a newly allocated
    /// #GTlsCertificate, or [`None`]. Use g_object_unref() to release the certificate.
    #[doc(alias = "g_tls_database_lookup_certificate_for_handle")]
    fn lookup_certificate_for_handle(
        &self,
        handle: &str,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<Option<TlsCertificate>, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificate_for_handle(
                self.as_ref().to_glib_none().0,
                handle.to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Asynchronously look up a certificate by its handle in the database. See
    /// g_tls_database_lookup_certificate_for_handle() for more information.
    /// ## `handle`
    /// a certificate handle
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// Flags which affect the lookup.
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    /// ## `callback`
    /// callback to call when the operation completes
    #[doc(alias = "g_tls_database_lookup_certificate_for_handle_async")]
    fn lookup_certificate_for_handle_async<
        P: FnOnce(Result<TlsCertificate, glib::Error>) + 'static,
    >(
        &self,
        handle: &str,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn lookup_certificate_for_handle_async_trampoline<
            P: FnOnce(Result<TlsCertificate, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificate_for_handle_finish(
                _source_object as *mut _,
                res,
                &mut error,
            );
            let result = if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = lookup_certificate_for_handle_async_trampoline::<P>;
        unsafe {
            ffi::g_tls_database_lookup_certificate_for_handle_async(
                self.as_ref().to_glib_none().0,
                handle.to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn lookup_certificate_for_handle_future(
        &self,
        handle: &str,
        interaction: Option<&(impl IsA<TlsInteraction> + Clone + 'static)>,
        flags: TlsDatabaseLookupFlags,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<TlsCertificate, glib::Error>> + 'static>>
    {
        let handle = String::from(handle);
        let interaction = interaction.map(ToOwned::to_owned);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.lookup_certificate_for_handle_async(
                    &handle,
                    interaction.as_ref().map(::std::borrow::Borrow::borrow),
                    flags,
                    Some(cancellable),
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ))
    }

    /// Look up the issuer of @certificate in the database. The
    /// #GTlsCertificate:issuer property of @certificate is not modified, and
    /// the two certificates are not hooked into a chain.
    ///
    /// This function can block. Use g_tls_database_lookup_certificate_issuer_async()
    /// to perform the lookup operation asynchronously.
    ///
    /// Beware this function cannot be used to build certification paths. The
    /// issuer certificate returned by this function may not be the same as
    /// the certificate that would actually be used to construct a valid
    /// certification path during certificate verification.
    /// [RFC 4158](https://datatracker.ietf.org/doc/html/rfc4158) explains
    /// why an issuer certificate cannot be naively assumed to be part of the
    /// the certification path (though GLib's TLS backends may not follow the
    /// path building strategies outlined in this RFC). Due to the complexity
    /// of certification path building, GLib does not provide any way to know
    /// which certification path will actually be used when verifying a TLS
    /// certificate. Accordingly, this function cannot be used to make
    /// security-related decisions. Only GLib itself should make security
    /// decisions about TLS certificates.
    /// ## `certificate`
    /// a #GTlsCertificate
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// flags which affect the lookup operation
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    ///
    /// # Returns
    ///
    /// a newly allocated issuer #GTlsCertificate,
    /// or [`None`]. Use g_object_unref() to release the certificate.
    #[doc(alias = "g_tls_database_lookup_certificate_issuer")]
    fn lookup_certificate_issuer(
        &self,
        certificate: &impl IsA<TlsCertificate>,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<TlsCertificate, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificate_issuer(
                self.as_ref().to_glib_none().0,
                certificate.as_ref().to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Asynchronously look up the issuer of @certificate in the database. See
    /// g_tls_database_lookup_certificate_issuer() for more information.
    /// ## `certificate`
    /// a #GTlsCertificate
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// flags which affect the lookup operation
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    /// ## `callback`
    /// callback to call when the operation completes
    #[doc(alias = "g_tls_database_lookup_certificate_issuer_async")]
    fn lookup_certificate_issuer_async<P: FnOnce(Result<TlsCertificate, glib::Error>) + 'static>(
        &self,
        certificate: &impl IsA<TlsCertificate>,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn lookup_certificate_issuer_async_trampoline<
            P: FnOnce(Result<TlsCertificate, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificate_issuer_finish(
                _source_object as *mut _,
                res,
                &mut error,
            );
            let result = if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = lookup_certificate_issuer_async_trampoline::<P>;
        unsafe {
            ffi::g_tls_database_lookup_certificate_issuer_async(
                self.as_ref().to_glib_none().0,
                certificate.as_ref().to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn lookup_certificate_issuer_future(
        &self,
        certificate: &(impl IsA<TlsCertificate> + Clone + 'static),
        interaction: Option<&(impl IsA<TlsInteraction> + Clone + 'static)>,
        flags: TlsDatabaseLookupFlags,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<TlsCertificate, glib::Error>> + 'static>>
    {
        let certificate = certificate.clone();
        let interaction = interaction.map(ToOwned::to_owned);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.lookup_certificate_issuer_async(
                    &certificate,
                    interaction.as_ref().map(::std::borrow::Borrow::borrow),
                    flags,
                    Some(cancellable),
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ))
    }

    /// Look up certificates issued by this issuer in the database.
    ///
    /// This function can block, use g_tls_database_lookup_certificates_issued_by_async() to perform
    /// the lookup operation asynchronously.
    /// ## `issuer_raw_dn`
    /// a #GByteArray which holds the DER encoded issuer DN.
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// Flags which affect the lookup operation.
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    ///
    /// # Returns
    ///
    /// a newly allocated list of #GTlsCertificate
    /// objects. Use g_object_unref() on each certificate, and g_list_free() on the release the list.
    #[doc(alias = "g_tls_database_lookup_certificates_issued_by")]
    fn lookup_certificates_issued_by(
        &self,
        issuer_raw_dn: &glib::ByteArray,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<Vec<TlsCertificate>, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificates_issued_by(
                self.as_ref().to_glib_none().0,
                issuer_raw_dn.to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(FromGlibPtrContainer::from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Asynchronously look up certificates issued by this issuer in the database. See
    /// g_tls_database_lookup_certificates_issued_by() for more information.
    ///
    /// The database may choose to hold a reference to the issuer byte array for the duration
    /// of this asynchronous operation. The byte array should not be modified during
    /// this time.
    /// ## `issuer_raw_dn`
    /// a #GByteArray which holds the DER encoded issuer DN.
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// Flags which affect the lookup operation.
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    /// ## `callback`
    /// callback to call when the operation completes
    #[doc(alias = "g_tls_database_lookup_certificates_issued_by_async")]
    fn lookup_certificates_issued_by_async<
        P: FnOnce(Result<Vec<TlsCertificate>, glib::Error>) + 'static,
    >(
        &self,
        issuer_raw_dn: &glib::ByteArray,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseLookupFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn lookup_certificates_issued_by_async_trampoline<
            P: FnOnce(Result<Vec<TlsCertificate>, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_lookup_certificates_issued_by_finish(
                _source_object as *mut _,
                res,
                &mut error,
            );
            let result = if error.is_null() {
                Ok(FromGlibPtrContainer::from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = lookup_certificates_issued_by_async_trampoline::<P>;
        unsafe {
            ffi::g_tls_database_lookup_certificates_issued_by_async(
                self.as_ref().to_glib_none().0,
                issuer_raw_dn.to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn lookup_certificates_issued_by_future(
        &self,
        issuer_raw_dn: &glib::ByteArray,
        interaction: Option<&(impl IsA<TlsInteraction> + Clone + 'static)>,
        flags: TlsDatabaseLookupFlags,
    ) -> Pin<
        Box_<dyn std::future::Future<Output = Result<Vec<TlsCertificate>, glib::Error>> + 'static>,
    > {
        let issuer_raw_dn = issuer_raw_dn.clone();
        let interaction = interaction.map(ToOwned::to_owned);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.lookup_certificates_issued_by_async(
                    &issuer_raw_dn,
                    interaction.as_ref().map(::std::borrow::Borrow::borrow),
                    flags,
                    Some(cancellable),
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ))
    }

    /// Determines the validity of a certificate chain, outside the context
    /// of a TLS session.
    ///
    /// @chain is a chain of #GTlsCertificate objects each pointing to the next
    /// certificate in the chain by its #GTlsCertificate:issuer property.
    ///
    /// @purpose describes the purpose (or usage) for which the certificate
    /// is being used. Typically @purpose will be set to [`TLS_DATABASE_PURPOSE_AUTHENTICATE_SERVER`][crate::TLS_DATABASE_PURPOSE_AUTHENTICATE_SERVER]
    /// which means that the certificate is being used to authenticate a server
    /// (and we are acting as the client).
    ///
    /// The @identity is used to ensure the server certificate is valid for
    /// the expected peer identity. If the identity does not match the
    /// certificate, [`TlsCertificateFlags::BAD_IDENTITY`][crate::TlsCertificateFlags::BAD_IDENTITY] will be set in the
    /// return value. If @identity is [`None`], that bit will never be set in
    /// the return value. The peer identity may also be used to check for
    /// pinned certificates (trust exceptions) in the database. These may
    /// override the normal verification process on a host-by-host basis.
    ///
    /// Currently there are no @flags, and [`TlsDatabaseVerifyFlags::NONE`][crate::TlsDatabaseVerifyFlags::NONE] should be
    /// used.
    ///
    /// If @chain is found to be valid, then the return value will be 0. If
    /// @chain is found to be invalid, then the return value will indicate at
    /// least one problem found. If the function is unable to determine
    /// whether @chain is valid (for example, because @cancellable is
    /// triggered before it completes) then the return value will be
    /// [`TlsCertificateFlags::GENERIC_ERROR`][crate::TlsCertificateFlags::GENERIC_ERROR] and @error will be set accordingly.
    /// @error is not set when @chain is successfully analyzed but found to
    /// be invalid.
    ///
    /// GLib guarantees that if certificate verification fails, at least one
    /// error will be set in the return value, but it does not guarantee
    /// that all possible errors will be set. Accordingly, you may not safely
    /// decide to ignore any particular type of error. For example, it would
    /// be incorrect to mask [`TlsCertificateFlags::EXPIRED`][crate::TlsCertificateFlags::EXPIRED] if you want to allow
    /// expired certificates, because this could potentially be the only
    /// error flag set even if other problems exist with the certificate.
    ///
    /// Prior to GLib 2.48, GLib's default TLS backend modified @chain to
    /// represent the certification path built by #GTlsDatabase during
    /// certificate verification by adjusting the #GTlsCertificate:issuer
    /// property of each certificate in @chain. Since GLib 2.48, this no
    /// longer occurs, so you cannot rely on #GTlsCertificate:issuer to
    /// represent the actual certification path used during certificate
    /// verification.
    ///
    /// Because TLS session context is not used, #GTlsDatabase may not
    /// perform as many checks on the certificates as #GTlsConnection would.
    /// For example, certificate constraints may not be honored, and
    /// revocation checks may not be performed. The best way to verify TLS
    /// certificates used by a TLS connection is to let #GTlsConnection
    /// handle the verification.
    ///
    /// The TLS backend may attempt to look up and add missing certificates
    /// to the chain. This may involve HTTP requests to download missing
    /// certificates.
    ///
    /// This function can block. Use g_tls_database_verify_chain_async() to
    /// perform the verification operation asynchronously.
    /// ## `chain`
    /// a #GTlsCertificate chain
    /// ## `purpose`
    /// the purpose that this certificate chain will be used for.
    /// ## `identity`
    /// the expected peer identity
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// additional verify flags
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    ///
    /// # Returns
    ///
    /// the appropriate #GTlsCertificateFlags which represents the
    /// result of verification.
    #[doc(alias = "g_tls_database_verify_chain")]
    fn verify_chain(
        &self,
        chain: &impl IsA<TlsCertificate>,
        purpose: &str,
        identity: Option<&impl IsA<SocketConnectable>>,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseVerifyFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<TlsCertificateFlags, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_tls_database_verify_chain(
                self.as_ref().to_glib_none().0,
                chain.as_ref().to_glib_none().0,
                purpose.to_glib_none().0,
                identity.map(|p| p.as_ref()).to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(from_glib(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Asynchronously determines the validity of a certificate chain after
    /// looking up and adding any missing certificates to the chain. See
    /// g_tls_database_verify_chain() for more information.
    /// ## `chain`
    /// a #GTlsCertificate chain
    /// ## `purpose`
    /// the purpose that this certificate chain will be used for.
    /// ## `identity`
    /// the expected peer identity
    /// ## `interaction`
    /// used to interact with the user if necessary
    /// ## `flags`
    /// additional verify flags
    /// ## `cancellable`
    /// a #GCancellable, or [`None`]
    /// ## `callback`
    /// callback to call when the operation completes
    #[doc(alias = "g_tls_database_verify_chain_async")]
    fn verify_chain_async<P: FnOnce(Result<TlsCertificateFlags, glib::Error>) + 'static>(
        &self,
        chain: &impl IsA<TlsCertificate>,
        purpose: &str,
        identity: Option<&impl IsA<SocketConnectable>>,
        interaction: Option<&impl IsA<TlsInteraction>>,
        flags: TlsDatabaseVerifyFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn verify_chain_async_trampoline<
            P: FnOnce(Result<TlsCertificateFlags, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret =
                ffi::g_tls_database_verify_chain_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(from_glib(ret))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = verify_chain_async_trampoline::<P>;
        unsafe {
            ffi::g_tls_database_verify_chain_async(
                self.as_ref().to_glib_none().0,
                chain.as_ref().to_glib_none().0,
                purpose.to_glib_none().0,
                identity.map(|p| p.as_ref()).to_glib_none().0,
                interaction.map(|p| p.as_ref()).to_glib_none().0,
                flags.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn verify_chain_future(
        &self,
        chain: &(impl IsA<TlsCertificate> + Clone + 'static),
        purpose: &str,
        identity: Option<&(impl IsA<SocketConnectable> + Clone + 'static)>,
        interaction: Option<&(impl IsA<TlsInteraction> + Clone + 'static)>,
        flags: TlsDatabaseVerifyFlags,
    ) -> Pin<
        Box_<dyn std::future::Future<Output = Result<TlsCertificateFlags, glib::Error>> + 'static>,
    > {
        let chain = chain.clone();
        let purpose = String::from(purpose);
        let identity = identity.map(ToOwned::to_owned);
        let interaction = interaction.map(ToOwned::to_owned);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.verify_chain_async(
                    &chain,
                    &purpose,
                    identity.as_ref().map(::std::borrow::Borrow::borrow),
                    interaction.as_ref().map(::std::borrow::Borrow::borrow),
                    flags,
                    Some(cancellable),
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ))
    }
}

impl<O: IsA<TlsDatabase>> TlsDatabaseExt for O {}