Network.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using LibGit2Sharp.Core;
using LibGit2Sharp.Core.Handles;
using LibGit2Sharp.Handlers;

namespace LibGit2Sharp
{
    /// <summary>
    /// Provides access to network functionality for a repository.
    /// </summary>
    public class Network
    {
        private readonly Repository repository;
        private readonly Lazy<RemoteCollection> remotes;

        /// <summary>
        /// Needed for mocking purposes.
        /// </summary>
        protected Network()
        { }

        internal Network(Repository repository)
        {
            this.repository = repository;
            remotes = new Lazy<RemoteCollection>(() => new RemoteCollection(repository));
        }

        /// <summary>
        /// Lookup and manage remotes in the repository.
        /// </summary>
        public virtual RemoteCollection Remotes
        {
            get { return remotes.Value; }
        }

        /// <summary>
        /// List references in a <see cref="Remote"/> repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to list from.</param>
        /// <returns>The references in the <see cref="Remote"/> repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(Remote remote)
        {
            Ensure.ArgumentNotNull(remote, "remote");

            return ListReferencesInternal(remote.Url, null, null, new ProxyOptions());
        }

        /// <summary>
        /// List references in a <see cref="Remote"/> repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to list from.</param>
        /// <param name="proxyOptions">Options for connecting through a proxy.</param>
        /// <returns>The references in the <see cref="Remote"/> repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(Remote remote, ProxyOptions proxyOptions)
        {
            Ensure.ArgumentNotNull(remote, "remote");

            return ListReferencesInternal(remote.Url, null, null, proxyOptions);
        }

        /// <summary>
        /// List references in a <see cref="Remote"/> repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to list from.</param>
        /// <param name="credentialsProvider">The <see cref="Func{Credentials}"/> used to connect to remote repository.</param>
        /// <returns>The references in the <see cref="Remote"/> repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(Remote remote, CredentialsHandler credentialsProvider)
        {
            Ensure.ArgumentNotNull(remote, "remote");
            Ensure.ArgumentNotNull(credentialsProvider, "credentialsProvider");

            return ListReferencesInternal(remote.Url, credentialsProvider, null, new ProxyOptions());
        }

        /// <summary>
        /// List references in a <see cref="Remote"/> repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to list from.</param>
        /// <param name="credentialsProvider">The <see cref="Func{Credentials}"/> used to connect to remote repository.</param>
        /// <param name="certificateCheck">This handler will be called to let the user make a decision on whether to allow the connection to proceed based on the certificate presented by the server..</param>
        /// <returns>The references in the <see cref="Remote"/> repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(Remote remote, CredentialsHandler credentialsProvider, CertificateCheckHandler certificateCheck)
        {
            Ensure.ArgumentNotNull(remote, "remote");
            Ensure.ArgumentNotNull(credentialsProvider, "credentialsProvider");
            Ensure.ArgumentNotNull(certificateCheck, "certificateCheck");

            return ListReferencesInternal(remote.Url, credentialsProvider, certificateCheck, new ProxyOptions());
        }

        /// <summary>
        /// List references in a <see cref="Remote"/> repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to list from.</param>
        /// <param name="credentialsProvider">The <see cref="Func{Credentials}"/> used to connect to remote repository.</param>
        /// <param name="proxyOptions">Options for connecting through a proxy.</param>
        /// <returns>The references in the <see cref="Remote"/> repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(Remote remote, CredentialsHandler credentialsProvider, ProxyOptions proxyOptions)
        {
            Ensure.ArgumentNotNull(remote, "remote");
            Ensure.ArgumentNotNull(credentialsProvider, "credentialsProvider");

            return ListReferencesInternal(remote.Url, credentialsProvider, null, proxyOptions);
        }

        /// <summary>
        /// List references in a remote repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="url">The url to list from.</param>
        /// <returns>The references in the remote repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(string url)
        {
            Ensure.ArgumentNotNull(url, "url");

            return ListReferencesInternal(url, null, null, new ProxyOptions());
        }

        /// <summary>
        /// List references in a remote repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="url">The url to list from.</param>
        /// <param name="proxyOptions">Options for connecting through a proxy.</param>
        /// <returns>The references in the remote repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(string url, ProxyOptions proxyOptions)
        {
            Ensure.ArgumentNotNull(url, "url");

            return ListReferencesInternal(url, null, null, proxyOptions);
        }

        /// <summary>
        /// List references in a remote repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="url">The url to list from.</param>
        /// <param name="credentialsProvider">The <see cref="Func{Credentials}"/> used to connect to remote repository.</param>
        /// <returns>The references in the remote repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(string url, CredentialsHandler credentialsProvider)
        {
            Ensure.ArgumentNotNull(url, "url");
            Ensure.ArgumentNotNull(credentialsProvider, "credentialsProvider");

            return ListReferencesInternal(url, credentialsProvider, null, new ProxyOptions());
        }

        /// <summary>
        /// List references in a remote repository.
        /// <para>
        /// When the remote tips are ahead of the local ones, the retrieved
        /// <see cref="DirectReference"/>s may point to non existing
        /// <see cref="GitObject"/>s in the local repository. In that
        /// case, <see cref="DirectReference.Target"/> will return <c>null</c>.
        /// </para>
        /// </summary>
        /// <param name="url">The url to list from.</param>
        /// <param name="credentialsProvider">The <see cref="Func{Credentials}"/> used to connect to remote repository.</param>
        /// <param name="proxyOptions">Options for connecting through a proxy.</param>
        /// <returns>The references in the remote repository.</returns>
        public virtual IEnumerable<Reference> ListReferences(string url, CredentialsHandler credentialsProvider, ProxyOptions proxyOptions)
        {
            Ensure.ArgumentNotNull(url, "url");
            Ensure.ArgumentNotNull(credentialsProvider, "credentialsProvider");

            return ListReferencesInternal(url, credentialsProvider, null, new ProxyOptions());
        }

        private IEnumerable<Reference> ListReferencesInternal(string url, CredentialsHandler credentialsProvider, CertificateCheckHandler certificateCheck, ProxyOptions proxyOptions)
        {
            proxyOptions ??= new();

            using RemoteHandle remoteHandle = BuildRemoteHandle(repository.Handle, url);
            using var proxyOptionsWrapper = new GitProxyOptionsWrapper(proxyOptions.CreateGitProxyOptions());

            GitRemoteCallbacks gitCallbacks = new GitRemoteCallbacks { version = 1 };

            if (credentialsProvider != null || certificateCheck != null)
            {
                var fetchOptions = new FetchOptions()
                {
                    CredentialsProvider = credentialsProvider,
                    CertificateCheck = certificateCheck
                };
                var callbacks = new RemoteCallbacks(fetchOptions);
                gitCallbacks = callbacks.GenerateCallbacks();
            }

            var gitProxyOptions = proxyOptionsWrapper.Options;

            Proxy.git_remote_connect(remoteHandle, GitDirection.Fetch, ref gitCallbacks, ref gitProxyOptions);
            return Proxy.git_remote_ls(repository, remoteHandle);
        }

        static RemoteHandle BuildRemoteHandle(RepositoryHandle repoHandle, string url)
        {
            Debug.Assert(repoHandle != null && !repoHandle.IsInvalid);
            Debug.Assert(url != null);

            RemoteHandle remoteHandle = Proxy.git_remote_create_anonymous(repoHandle, url);
            Debug.Assert(remoteHandle != null && !remoteHandle.IsInvalid);

            return remoteHandle;
        }

        /// <summary>
        /// Fetch from a url with a set of fetch refspecs
        /// </summary>
        /// <param name="url">The url to fetch from</param>
        /// <param name="refspecs">The list of resfpecs to use</param>
        public virtual void Fetch(string url, IEnumerable<string> refspecs)
        {
            Fetch(url, refspecs, null, null);
        }

        /// <summary>
        /// Fetch from a url with a set of fetch refspecs
        /// </summary>
        /// <param name="url">The url to fetch from</param>
        /// <param name="refspecs">The list of resfpecs to use</param>
        /// <param name="options"><see cref="FetchOptions"/> controlling fetch behavior</param>
        public virtual void Fetch(string url, IEnumerable<string> refspecs, FetchOptions options)
        {
            Fetch(url, refspecs, options, null);
        }

        /// <summary>
        /// Fetch from a url with a set of fetch refspecs
        /// </summary>
        /// <param name="url">The url to fetch from</param>
        /// <param name="refspecs">The list of resfpecs to use</param>
        /// <param name="logMessage">Message to use when updating the reflog.</param>
        public virtual void Fetch(string url, IEnumerable<string> refspecs, string logMessage)
        {
            Fetch(url, refspecs, null, logMessage);
        }

        /// <summary>
        /// Fetch from a url with a set of fetch refspecs
        /// </summary>
        /// <param name="url">The url to fetch from</param>
        /// <param name="refspecs">The list of resfpecs to use</param>
        /// <param name="options"><see cref="FetchOptions"/> controlling fetch behavior</param>
        /// <param name="logMessage">Message to use when updating the reflog.</param>
        public virtual void Fetch(
            string url,
            IEnumerable<string> refspecs,
            FetchOptions options,
            string logMessage)
        {
            Ensure.ArgumentNotNull(url, "url");
            Ensure.ArgumentNotNull(refspecs, "refspecs");

            Commands.Fetch(repository, url, refspecs, options, logMessage);
        }

        /// <summary>
        /// Push the specified branch to its tracked branch on the remote.
        /// </summary>
        /// <param name="branch">The branch to push.</param>
        /// <exception cref="LibGit2SharpException">Throws if either the Remote or the UpstreamBranchCanonicalName is not set.</exception>
        public virtual void Push(
            Branch branch)
        {
            Push(new[] { branch });
        }
        /// <summary>
        /// Push the specified branch to its tracked branch on the remote.
        /// </summary>
        /// <param name="branch">The branch to push.</param>
        /// <param name="pushOptions"><see cref="PushOptions"/> controlling push behavior</param>
        /// <exception cref="LibGit2SharpException">Throws if either the Remote or the UpstreamBranchCanonicalName is not set.</exception>
        public virtual void Push(
            Branch branch,
            PushOptions pushOptions)
        {
            Push(new[] { branch }, pushOptions);
        }

        /// <summary>
        /// Push the specified branches to their tracked branches on the remote.
        /// </summary>
        /// <param name="branches">The branches to push.</param>
        /// <exception cref="LibGit2SharpException">Throws if either the Remote or the UpstreamBranchCanonicalName is not set.</exception>
        public virtual void Push(
            IEnumerable<Branch> branches)
        {
            Push(branches, null);
        }

        /// <summary>
        /// Push the specified branches to their tracked branches on the remote.
        /// </summary>
        /// <param name="branches">The branches to push.</param>
        /// <param name="pushOptions"><see cref="PushOptions"/> controlling push behavior</param>
        /// <exception cref="LibGit2SharpException">Throws if either the Remote or the UpstreamBranchCanonicalName is not set.</exception>
        public virtual void Push(
            IEnumerable<Branch> branches,
            PushOptions pushOptions)
        {
            var enumeratedBranches = branches as IList<Branch> ?? branches.ToList();

            foreach (var branch in enumeratedBranches)
            {
                if (string.IsNullOrEmpty(branch.UpstreamBranchCanonicalName))
                {
                    throw new LibGit2SharpException("The branch '{0}' (\"{1}\") that you are trying to push does not track an upstream branch.",
                            branch.FriendlyName, branch.CanonicalName);
                }
            }

            foreach (var branch in enumeratedBranches)
            {
                using (var remote = repository.Network.Remotes.RemoteForName(branch.RemoteName))
                {
                    Push(remote, string.Format(
                        CultureInfo.InvariantCulture,
                        "{0}:{1}", branch.CanonicalName, branch.UpstreamBranchCanonicalName), pushOptions);
                }
            }
        }

        /// <summary>
        /// Push the objectish to the destination reference on the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="objectish">The source objectish to push.</param>
        /// <param name="destinationSpec">The reference to update on the remote.</param>
        public virtual void Push(
            Remote remote,
            string objectish,
            string destinationSpec)
        {
            Ensure.ArgumentNotNull(objectish, "objectish");
            Ensure.ArgumentNotNullOrEmptyString(destinationSpec, "destinationSpec");

            Push(remote,
                 string.Format(CultureInfo.InvariantCulture,
                               "{0}:{1}",
                               objectish,
                               destinationSpec));
        }

        /// <summary>
        /// Push the objectish to the destination reference on the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="objectish">The source objectish to push.</param>
        /// <param name="destinationSpec">The reference to update on the remote.</param>
        /// <param name="pushOptions"><see cref="PushOptions"/> controlling push behavior</param>
        public virtual void Push(
            Remote remote,
            string objectish,
            string destinationSpec,
            PushOptions pushOptions)
        {
            Ensure.ArgumentNotNull(objectish, "objectish");
            Ensure.ArgumentNotNullOrEmptyString(destinationSpec, "destinationSpec");

            Push(remote,
                 string.Format(CultureInfo.InvariantCulture,
                               "{0}:{1}",
                               objectish,
                               destinationSpec),
                 pushOptions);
        }

        /// <summary>
        /// Push specified reference to the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="pushRefSpec">The pushRefSpec to push.</param>
        public virtual void Push(Remote remote, string pushRefSpec)
        {
            Ensure.ArgumentNotNullOrEmptyString(pushRefSpec, "pushRefSpec");

            Push(remote, new[] { pushRefSpec });
        }
        /// <summary>
        /// Push specified reference to the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="pushRefSpec">The pushRefSpec to push.</param>
        /// <param name="pushOptions"><see cref="PushOptions"/> controlling push behavior</param>
        public virtual void Push(
            Remote remote,
            string pushRefSpec,
            PushOptions pushOptions)
        {
            Ensure.ArgumentNotNullOrEmptyString(pushRefSpec, "pushRefSpec");

            Push(remote, new[] { pushRefSpec }, pushOptions);
        }

        /// <summary>
        /// Push specified references to the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="pushRefSpecs">The pushRefSpecs to push.</param>
        public virtual void Push(Remote remote, IEnumerable<string> pushRefSpecs)
        {
            Push(remote, pushRefSpecs, null);
        }

        /// <summary>
        /// Push specified references to the <see cref="Remote"/>.
        /// </summary>
        /// <param name="remote">The <see cref="Remote"/> to push to.</param>
        /// <param name="pushRefSpecs">The pushRefSpecs to push.</param>
        /// <param name="pushOptions"><see cref="PushOptions"/> controlling push behavior</param>
        public virtual void Push(Remote remote, IEnumerable<string> pushRefSpecs, PushOptions pushOptions)
        {
            Ensure.ArgumentNotNull(remote, "remote");
            Ensure.ArgumentNotNull(pushRefSpecs, "pushRefSpecs");

            // Return early if there is nothing to push.
            if (!pushRefSpecs.Any())
            {
                return;
            }

            if (pushOptions == null)
            {
                pushOptions = new PushOptions();
            }

            // Load the remote.
            using (RemoteHandle remoteHandle = Proxy.git_remote_lookup(repository.Handle, remote.Name, true))

            // Create a git options wrapper so managed strings are disposed.
            using (var pushOptionsWrapper = new GitPushOptionsWrapper())
            {
                var callbacks = new RemoteCallbacks(pushOptions);
                GitRemoteCallbacks gitCallbacks = callbacks.GenerateCallbacks();

                var gitPushOptions = pushOptionsWrapper.Options;
                gitPushOptions.PackbuilderDegreeOfParallelism = pushOptions.PackbuilderDegreeOfParallelism;
                gitPushOptions.RemoteCallbacks = gitCallbacks;
                gitPushOptions.ProxyOptions = pushOptions.ProxyOptions.CreateGitProxyOptions();

                // If there are custom headers, create a managed string array.
                if (pushOptions.CustomHeaders != null && pushOptions.CustomHeaders.Length > 0)
                {
                    gitPushOptions.CustomHeaders = GitStrArrayManaged.BuildFrom(pushOptions.CustomHeaders);
                }

                Proxy.git_remote_push(remoteHandle,
                                      pushRefSpecs,
                                      gitPushOptions);
            }
        }

        /// <summary>
        /// The heads that have been updated during the last fetch.
        /// </summary>
        internal virtual IEnumerable<FetchHead> FetchHeads
        {
            get
            {
                int i = 0;

                Func<string, string, GitOid, bool, FetchHead> resultSelector =
                    (name, url, oid, isMerge) => new FetchHead(repository, name, url, oid, isMerge, i++);

                return Proxy.git_repository_fetchhead_foreach(repository.Handle, resultSelector);
            }
        }
    }
}