FactorInstancesProvider

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
 	"cSpell.words": [
 		"analyser",
+		"Appendable",
 		"Banksy",
 		"bdfs",
 		"Fulfillable",

src/factor_instances_provider/agnostic_paths/derivation_preset.rs

@@ -0,0 +1,93 @@
+use crate::prelude::*;
+
+/// Derivation Presets are Network agnostic and Index agnostic
+/// "templates" for DerivationPaths.
+#[derive(Clone, Copy, Hash, PartialEq, Eq, enum_iterator::Sequence, derive_more::Debug)]
+pub enum DerivationPreset {
+    /// Used to form DerivationPaths used to derive FactorInstances
+    /// for "veci": Virtual Entity Creating (Factor)Instance for accounts.
+    /// `(EntityKind::Account, KeySpace::Unsecurified, KeyKind::TransactionSigning)`
+    #[debug("A-VECI")]
+    AccountVeci,
+
+    /// Used to form DerivationPaths used to derive FactorInstances
+    /// for "mfa" to securify accounts.
+    /// `(EntityKind::Account, KeySpace::Securified, KeyKind::TransactionSigning)`
+    #[debug("A-MFA")]
+    AccountMfa,
+
+    /// Used to form DerivationPaths used to derive FactorInstances
+    /// for "veci": Virtual Entity Creating (Factor)Instance for personas.
+    /// `(EntityKind::Identity, KeySpace::Unsecurified, KeyKind::TransactionSigning)`
+    #[debug("I-VECI")]
+    IdentityVeci,
+
+    /// Used to form DerivationPaths used to derive FactorInstances
+    /// for "mfa" to securify personas.
+    /// `(EntityKind::Identity, KeySpace::Securified, KeyKind::TransactionSigning)`
+    #[debug("I-MFA")]
+    IdentityMfa,
+}
+
+// =============
+// Construction
+// =============
+impl DerivationPreset {
+    /// All DerivationPreset's, used to fill cache.
+    pub fn all() -> IndexSet<Self> {
+        enum_iterator::all::<Self>().collect()
+    }
+
+    /// Selects a `DerivationPreset` for veci based on `CAP26EntityKind`,
+    /// i.e. either `DerivationPreset::AccountVeci` or `DerivationPreset::IdentityVeci`.
+    pub fn veci_entity_kind(entity_kind: CAP26EntityKind) -> Self {
+        match entity_kind {
+            CAP26EntityKind::Account => Self::AccountVeci,
+            CAP26EntityKind::Identity => Self::IdentityVeci,
+        }
+    }
+
+    /// Selects a `DerivationPreset` for MFA based on `CAP26EntityKind`,
+    /// i.e. either `DerivationPreset::AccountMfa` or `DerivationPreset::IdentityMfa`.
+    pub fn mfa_entity_kind(entity_kind: CAP26EntityKind) -> Self {
+        match entity_kind {
+            CAP26EntityKind::Account => Self::AccountMfa,
+            CAP26EntityKind::Identity => Self::IdentityMfa,
+        }
+    }
+}
+
+// =============
+// Instance Methods
+// =============
+impl DerivationPreset {
+    /// Returns the `CAP26EntityKind` of the `DerivationPreset`.
+    pub fn entity_kind(&self) -> CAP26EntityKind {
+        match self {
+            Self::AccountVeci | Self::AccountMfa => CAP26EntityKind::Account,
+            Self::IdentityVeci | Self::IdentityMfa => CAP26EntityKind::Identity,
+        }
+    }
+
+    /// Returns the `CAP26KeyKind` of the `DerivationPreset`.
+    pub fn key_kind(&self) -> CAP26KeyKind {
+        match self {
+            Self::AccountVeci | Self::IdentityVeci | Self::AccountMfa | Self::IdentityMfa => {
+                CAP26KeyKind::TransactionSigning
+            }
+        }
+    }
+
+    /// Returns the `KeySpace` of the `DerivationPreset`.
+    pub fn key_space(&self) -> KeySpace {
+        match self {
+            Self::AccountVeci | Self::IdentityVeci => KeySpace::Unsecurified,
+            Self::AccountMfa | Self::IdentityMfa => KeySpace::Securified,
+        }
+    }
+
+    /// Maps a DerivationPreset to a `IndexAgnosticPath` which is network aware.
+    pub fn index_agnostic_path_on_network(&self, network_id: NetworkID) -> IndexAgnosticPath {
+        IndexAgnosticPath::from((network_id, *self))
+    }
+}

src/factor_instances_provider/agnostic_paths/index_agnostic_path.rs

@@ -0,0 +1,122 @@
+use crate::prelude::*;
+
+use super::quantities;
+
+/// A DerivationPath which is not indexed. On a specific network.
+#[derive(Clone, Copy, Hash, PartialEq, Eq, derive_more::Debug, derive_more::Display)]
+#[display("{}/{}/{}/?{}", network_id, entity_kind, key_kind, key_space.indicator())]
+#[debug("{:?}/{:?}/{:?}/?{}", network_id, entity_kind, key_kind, key_space.indicator())]
+pub struct IndexAgnosticPath {
+    pub network_id: NetworkID,
+    pub entity_kind: CAP26EntityKind,
+    pub key_kind: CAP26KeyKind,
+    pub key_space: KeySpace,
+}
+
+impl IndexAgnosticPath {
+    pub fn new(
+        network_id: NetworkID,
+        entity_kind: CAP26EntityKind,
+        key_kind: CAP26KeyKind,
+        key_space: KeySpace,
+    ) -> Self {
+        Self {
+            network_id,
+            entity_kind,
+            key_kind,
+            key_space,
+        }
+    }
+}
+
+impl From<(NetworkID, DerivationPreset)> for IndexAgnosticPath {
+    fn from((network_id, agnostic_path): (NetworkID, DerivationPreset)) -> Self {
+        Self::new(
+            network_id,
+            agnostic_path.entity_kind(),
+            agnostic_path.key_kind(),
+            agnostic_path.key_space(),
+        )
+    }
+}
+
+impl TryFrom<IndexAgnosticPath> for DerivationPreset {
+    type Error = CommonError;
+    /// Tries to convert an IndexAgnosticPath to a DerivationPreset,
+    /// is failing if the path is not a standard DerivationPreset
+    fn try_from(value: IndexAgnosticPath) -> Result<DerivationPreset> {
+        match (value.entity_kind, value.key_kind, value.key_space) {
+            (
+                CAP26EntityKind::Account,
+                CAP26KeyKind::TransactionSigning,
+                KeySpace::Unsecurified,
+            ) => Ok(DerivationPreset::AccountVeci),
+            (
+                CAP26EntityKind::Identity,
+                CAP26KeyKind::TransactionSigning,
+                KeySpace::Unsecurified,
+            ) => Ok(DerivationPreset::IdentityVeci),
+            (CAP26EntityKind::Account, CAP26KeyKind::TransactionSigning, KeySpace::Securified) => {
+                Ok(DerivationPreset::AccountMfa)
+            }
+            (CAP26EntityKind::Identity, CAP26KeyKind::TransactionSigning, KeySpace::Securified) => {
+                Ok(DerivationPreset::IdentityMfa)
+            }
+            _ => Err(CommonError::NonStandardDerivationPath),
+        }
+    }
+}
+
+impl From<(IndexAgnosticPath, HDPathComponent)> for DerivationPath {
+    fn from((path, index): (IndexAgnosticPath, HDPathComponent)) -> Self {
+        assert_eq!(index.key_space(), path.key_space);
+        Self::new(path.network_id, path.entity_kind, path.key_kind, index)
+    }
+}
+
+impl DerivationPath {
+    pub fn agnostic(&self) -> IndexAgnosticPath {
+        IndexAgnosticPath {
+            network_id: self.network_id,
+            entity_kind: self.entity_kind,
+            key_kind: self.key_kind,
+            key_space: self.key_space(),
+        }
+    }
+}
+impl HierarchicalDeterministicFactorInstance {
+    pub fn agnostic_path(&self) -> IndexAgnosticPath {
+        self.derivation_path().agnostic()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    type Sut = IndexAgnosticPath;
+
+    #[test]
+    fn try_from_success() {
+        NetworkID::all().into_iter().for_each(|n| {
+            let f = |preset: DerivationPreset| {
+                let sut = preset.index_agnostic_path_on_network(n);
+                let back_again = DerivationPreset::try_from(sut).unwrap();
+                assert_eq!(back_again, preset);
+            };
+
+            DerivationPreset::all().into_iter().for_each(|p| f(p));
+        });
+    }
+
+    #[test]
+    fn try_from_fail() {
+        let path = Sut::new(
+            NetworkID::Stokenet,
+            CAP26EntityKind::Account,
+            CAP26KeyKind::AuthenticationSigning,
+            KeySpace::Unsecurified,
+        );
+        assert!(DerivationPreset::try_from(path).is_err());
+    }
+}

src/factor_instances_provider/agnostic_paths/mod.rs

@@ -0,0 +1,9 @@
+mod derivation_preset;
+mod index_agnostic_path;
+mod quantified_derivation_preset;
+mod quantities;
+
+pub use derivation_preset::*;
+pub use index_agnostic_path::*;
+pub use quantified_derivation_preset::*;
+pub use quantities::*;

src/factor_instances_provider/agnostic_paths/quantified_derivation_preset.rs

@@ -0,0 +1,17 @@
+use crate::prelude::*;
+
+#[derive(Clone, Copy, Hash, PartialEq, Eq, derive_more::Debug)]
+#[debug("🎯: {:?} #{}", self.derivation_preset, self.quantity)]
+pub struct QuantifiedDerivationPreset {
+    pub derivation_preset: DerivationPreset,
+    pub quantity: usize,
+}
+
+impl QuantifiedDerivationPreset {
+    pub fn new(derivation_preset: DerivationPreset, quantity: usize) -> Self {
+        Self {
+            derivation_preset,
+            quantity,
+        }
+    }
+}

src/factor_instances_provider/agnostic_paths/quantities.rs

@@ -0,0 +1,4 @@
+use crate::prelude::*;
+
+/// The quantity of DerivationPreset's to fill cache with.
+pub const CACHE_FILLING_QUANTITY: usize = 30;

src/factor_instances_provider/mod.rs

@@ -0,0 +1,7 @@
+mod agnostic_paths;
+mod next_index_assigner;
+mod provider;
+
+pub use agnostic_paths::*;
+pub use next_index_assigner::*;
+pub use provider::*;

src/factor_instances_provider/next_index_assigner/mod.rs

@@ -0,0 +1,11 @@
+mod next_derivation_entity_index_assigner;
+mod next_derivation_entity_index_cache_analyzing_assigner;
+mod next_derivation_entity_index_profile_analyzing_assigner;
+mod next_derivation_entity_index_with_ephemeral_offsets;
+mod next_derivation_entity_index_with_ephemeral_offsets_for_factor_source;
+
+pub use next_derivation_entity_index_assigner::*;
+pub use next_derivation_entity_index_cache_analyzing_assigner::*;
+pub use next_derivation_entity_index_profile_analyzing_assigner::*;
+pub use next_derivation_entity_index_with_ephemeral_offsets::*;
+pub use next_derivation_entity_index_with_ephemeral_offsets_for_factor_source::*;

src/factor_instances_provider/next_index_assigner/next_derivation_entity_index_assigner.rs

@@ -0,0 +1,84 @@
+use crate::prelude::*;
+
+/// An assigner of derivation entity indices, used by the FactorInstancesProvider
+/// to map `IndexAgnosticPath` -> `DerivationPath` for some FactorSource on
+/// some NetworkID.
+///
+/// This assigner works with the:
+/// * cache
+/// * profile
+/// * local offsets
+///
+/// More specifically the assigner's `next` method performs approximately this
+/// operation:
+///
+/// ```ignore
+/// pub fn next(
+///    &mut self,
+///    fs_id: FactorSourceIDFromHash,
+///    path: IndexAgnosticPath,
+/// ) -> Result<HDPathComponent> {
+///     let next_from_cache = self.cache_analyzing.next(fs_id, path).unwrap_or(0);
+///     let next_from_profile = self.profile_analyzing.next(fs_id, path).unwrap_or(0);
+///     
+///     let max_index = std::cmp::max(next_from_profile, next_from_cache);
+///     let ephemeral_offset = self.ephemeral_offsets.reserve()
+///
+///     max_index + ephemeral_offset
+/// ```
+pub struct NextDerivationEntityIndexAssigner {
+    profile_analyzing: NextDerivationEntityIndexProfileAnalyzingAssigner,
+    cache_analyzing: NextDerivationEntityIndexCacheAnalyzingAssigner,
+    ephemeral_offsets: NextDerivationEntityIndexWithEphemeralOffsets,
+}
+
+impl NextDerivationEntityIndexAssigner {
+    pub fn new(
+        network_id: NetworkID,
+        profile: impl Into<Option<Profile>>,
+        cache: FactorInstancesCache,
+    ) -> Self {
+        let profile_analyzing =
+            NextDerivationEntityIndexProfileAnalyzingAssigner::new(network_id, profile);
+        let cache_analyzing = NextDerivationEntityIndexCacheAnalyzingAssigner::new(cache);
+        let ephemeral_offsets = NextDerivationEntityIndexWithEphemeralOffsets::default();
+        Self {
+            profile_analyzing,
+            cache_analyzing,
+            ephemeral_offsets,
+        }
+    }
+
+    /// Returns the next index for the given `FactorSourceIDFromHash` and
+    /// `IndexAgnosticPath`, by analyzing the cache, the profile and adding
+    /// local ephemeral offsets.
+    pub fn next(
+        &self,
+        factor_source_id: FactorSourceIDFromHash,
+        index_agnostic_path: IndexAgnosticPath,
+    ) -> Result<HDPathComponent> {
+        let default_index = HDPathComponent::new_with_key_space_and_base_index(
+            index_agnostic_path.key_space,
+            U30::new(0).unwrap(),
+        );
+
+        let maybe_next_from_cache = self
+            .cache_analyzing
+            .next(factor_source_id, index_agnostic_path)?;
+
+        let next_from_cache = maybe_next_from_cache.unwrap_or(default_index);
+        let ephemeral = self
+            .ephemeral_offsets
+            .reserve(factor_source_id, index_agnostic_path);
+
+        let maybe_next_from_profile = self
+            .profile_analyzing
+            .next(factor_source_id, index_agnostic_path)?;
+
+        let next_from_profile = maybe_next_from_profile.unwrap_or(default_index);
+
+        let max_index = std::cmp::max(next_from_profile, next_from_cache);
+
+        max_index.add_n(ephemeral)
+    }
+}