/// <summary>
/// Creates a new selection candidate.
/// </summary>
/// <param name="feedUri">The file name or URL of the feed listing the implementation.</param>
/// <param name="feedPreferences">The <see cref="FeedPreferences"/> for <see cref="FeedUri"/>.</param>
/// <param name="implementation">The implementation this selection candidate references.</param>
/// <param name="requirements">A set of requirements/restrictions the <paramref name="implementation"/> needs to fullfill for <see cref="IsSuitable"/> to be <c>true</c>.</param>
/// <param name="offlineUncached">Mark this candidate as unsuitable because it is uncached and <see cref="Config.NetworkUse"/> is set to <see cref="NetworkLevel.Offline"/>.</param>
/// <exception cref="InvalidDataException"><paramref name="implementation"/>'s <see cref="ImplementationBase.ID"/> is empty.</exception>
public SelectionCandidate([NotNull] FeedUri feedUri, [NotNull] FeedPreferences feedPreferences, [NotNull] Implementation implementation, [NotNull] Requirements requirements, bool offlineUncached = false)
{
#region Sanity checks
if (feedUri == null)
{
throw new ArgumentNullException(nameof(feedUri));
}
if (feedPreferences == null)
{
throw new ArgumentNullException(nameof(feedPreferences));
}
if (implementation == null)
{
throw new ArgumentNullException(nameof(implementation));
}
if (requirements == null)
{
throw new ArgumentNullException(nameof(requirements));
}
#endregion
if (string.IsNullOrEmpty(implementation.ID))
{
throw new InvalidDataException(string.Format(Resources.ImplementationMissingID, implementation, feedUri));
}
FeedUri = feedUri;
FeedPreferences = feedPreferences;
Implementation = implementation;
_implementationPreferences = feedPreferences[implementation.ID];
CheckSuitabilty(requirements, offlineUncached);
}
private IEnumerable <SelectionCandidate> GetCandidates(FeedUri feedUri, Feed feed, Requirements requirements)
{
var feedPreferences = FeedPreferences.LoadForSafe(feedUri);
foreach (var element in feed.Elements)
{
var packageImplementation = element as PackageImplementation;
if (packageImplementation != null)
{ // Each <package-implementation> provides 0..n selection candidates
var externalImplementations = _packageManager.Query(packageImplementation, requirements.Distributions.ToArray());
foreach (var externalImplementation in externalImplementations)
{
_externalImplementations[externalImplementation.ID] = externalImplementation;
yield return(new SelectionCandidate(new FeedUri(FeedUri.FromDistributionPrefix + feedUri), feedPreferences, externalImplementation, requirements));
}
}
else if (requirements.Distributions.ContainsOrEmpty(Restriction.DistributionZeroInstall))
{
var implementation = element as Implementation;
if (implementation != null)
{ // Each <implementation> provides 1 selection candidate
yield return(new SelectionCandidate(feedUri, feedPreferences, implementation, requirements,
offlineUncached: (_config.NetworkUse == NetworkLevel.Offline) && !_isCached(implementation)));
}
}
}
}
/// <inheritdoc/>
public void ImportFeed(string path, FeedUri uri, FeedUri mirrorUrl = null)
{
#region Sanity checks
if (uri == null)
{
throw new ArgumentNullException("uri");
}
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
#endregion
if (uri.IsFile)
{
throw new UriFormatException(Resources.FeedUriLocal);
}
Log.Debug("Importing feed " + uri.ToStringRfc() + " from: " + path);
var data = File.ReadAllBytes(path);
var newSignature = _trustManager.CheckTrust(data, uri, mirrorUrl);
DetectAttacks(data, uri, newSignature);
// Add to cache and remember time
_feedCache.Add(uri, data);
var preferences = FeedPreferences.LoadForSafe(uri);
preferences.LastChecked = DateTime.UtcNow;
preferences.Normalize();
preferences.SaveFor(uri);
}
public void TestNormalize()
{
var keep = new ImplementationPreferences {ID = "id1", UserStability = Stability.Testing};
var superflous = new ImplementationPreferences {ID = "id2"};
var preferences = new FeedPreferences {Implementations = {keep, superflous}};
preferences.Normalize();
preferences.Implementations.Should().BeEquivalentTo(keep);
}
public void TestNormalize()
{
var keep = new ImplementationPreferences {ID = "id1", UserStability = Stability.Testing};
var superflous = new ImplementationPreferences {ID = "id2"};
var preferences = new FeedPreferences {Implementations = {keep, superflous}};
preferences.Normalize();
CollectionAssert.AreEquivalent(new[] {keep}, preferences.Implementations);
}
private void AddToCache(byte[] data, FeedUri feedUri)
{
_feedCache.Add(feedUri, data);
var preferences = FeedPreferences.LoadForSafe(feedUri);
preferences.LastChecked = DateTime.UtcNow;
preferences.Normalize();
preferences.SaveFor(feedUri);
}
public void TestGetImplementationPreferences()
{
var preferences = new FeedPreferences();
var prefs1 = preferences["id1"];
Assert.AreSame(prefs1, preferences["id1"], "Second call with same ID should return same reference");
var prefs2 = new ImplementationPreferences {ID = "id2"};
preferences.Implementations.Add(prefs2);
Assert.AreSame(prefs2, preferences["id2"], "Call with pre-existing ID should return existing reference");
CollectionAssert.AreEquivalent(new[] {prefs1, prefs2}, preferences.Implementations);
}
/// <inheritdoc/>
public bool IsStale(FeedUri feedUri)
{
#region Sanity checks
if (feedUri == null)
{
throw new ArgumentNullException(nameof(feedUri));
}
#endregion
var preferences = FeedPreferences.LoadForSafe(feedUri);
TimeSpan lastChecked = DateTime.UtcNow - preferences.LastChecked;
TimeSpan lastCheckAttempt = DateTime.UtcNow - GetLastCheckAttempt(feedUri);
return(lastChecked > _config.Freshness && lastCheckAttempt > _failedCheckDelay);
}
private IEnumerable <SelectionCandidate> GenerateDummyCandidates(FeedUri feedUri)
{
if (feedUri.IsFromDistribution)
{
return(Enumerable.Empty <SelectionCandidate>());
}
try
{
var feed = _feedManager[feedUri];
var feedPreferences = FeedPreferences.LoadForSafe(feedUri);
return(feed.Implementations.Select(implementation => GenerateDummyCandidate(feedUri, feedPreferences, implementation)));
}
#region Error handling
catch (KeyNotFoundException)
{
return(Enumerable.Empty <SelectionCandidate>());
}
#endregion
}
private static void ApplyVersionRestrictions(Requirements requirements, Selections selections)
{
if (requirements.ExtraRestrictions.Count == 0)
{
return;
}
// TODO
Log.Warn($"You have applied a version restriction to this app. Zero Install will continue to apply this restriction to any future updates. You will need to run '0install select --customize {requirements.InterfaceUri}' to undo this.");
foreach (var restriction in requirements.ExtraRestrictions)
{
var selection = selections.GetImplementation(restriction.Key);
if (selection != null)
{
var pref = FeedPreferences.LoadForSafe(restriction.Key);
pref.Implementations.Clear();
pref[selection.ID].UserStability = Stability.Preferred;
pref.SaveFor(restriction.Key);
}
}
}
private SelectionCandidate GenerateDummyCandidate(FeedUri feedUri, FeedPreferences feedPreferences, Implementation implementation)
{
return new SelectionCandidate(feedUri, feedPreferences, implementation,
new Requirements(_interfaceUri, Command.NameRun, new Architecture(Architecture.CurrentSystem.OS, Cpu.All)));
}
private SelectionCandidate GenerateDummyCandidate(FeedUri feedUri, FeedPreferences feedPreferences, Implementation implementation)
=> new SelectionCandidate(feedUri, feedPreferences, implementation,
new Requirements(_interfaceUri, "", new Architecture(Architecture.CurrentSystem.OS, Cpu.All)));
public void TestGetImplementationPreferences()
{
var preferences = new FeedPreferences();
var prefs1 = preferences["id1"];
preferences["id1"].Should().BeSameAs(prefs1, because: "Second call with same ID should return same reference");
var prefs2 = new ImplementationPreferences {ID = "id2"};
preferences.Implementations.Add(prefs2);
preferences["id2"].Should().BeSameAs(prefs2, because: "Call with pre-existing ID should return existing reference");
preferences.Implementations.Should().BeEquivalentTo(prefs1, prefs2);
}
private SelectionCandidate GenerateDummyCandidate(FeedUri feedUri, FeedPreferences feedPreferences, Implementation implementation) => new(feedUri, feedPreferences, implementation,
