From 1894f975032013ef855c438654fbb745512e7982 Mon Sep 17 00:00:00 2001
From: Ava Chow <github@achow101.com>
Date: Mon, 15 Jan 2024 17:09:22 -0500
Subject: [PATCH] descriptors: Add PubkeyProvider::IsBIP32()

---
 src/script/descriptor.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
index 71645c87462..d5e4bc2195f 100644
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -221,6 +221,9 @@ public:
 
     /** Make a deep copy of this PubkeyProvider */
     virtual std::unique_ptr<PubkeyProvider> Clone() const = 0;
+
+    /** Whether this PubkeyProvider is a BIP 32 extended key that can be derived from */
+    virtual bool IsBIP32() const = 0;
 };
 
 class OriginPubkeyProvider final : public PubkeyProvider
@@ -251,6 +254,7 @@ public:
     }
     bool IsRange() const override { return m_provider->IsRange(); }
     size_t GetSize() const override { return m_provider->GetSize(); }
+    bool IsBIP32() const override { return m_provider->IsBIP32(); }
     std::string ToString(StringType type) const override { return "[" + OriginString(type) + "]" + m_provider->ToString(type); }
     bool ToPrivateString(const SigningProvider& arg, std::string& ret) const override
     {
@@ -319,6 +323,7 @@ public:
     }
     bool IsRange() const override { return false; }
     size_t GetSize() const override { return m_pubkey.size(); }
+    bool IsBIP32() const override { return false; }
     std::string ToString(StringType type) const override { return m_xonly ? HexStr(m_pubkey).substr(2) : HexStr(m_pubkey); }
     bool ToPrivateString(const SigningProvider& arg, std::string& ret) const override
     {
@@ -406,6 +411,7 @@ public:
     BIP32PubkeyProvider(uint32_t exp_index, const CExtPubKey& extkey, KeyPath path, DeriveType derive, bool apostrophe) : PubkeyProvider(exp_index), m_root_extkey(extkey), m_path(std::move(path)), m_derive(derive), m_apostrophe(apostrophe) {}
     bool IsRange() const override { return m_derive != DeriveType::NO; }
     size_t GetSize() const override { return 33; }
+    bool IsBIP32() const override { return true; }
     std::optional<CPubKey> GetPubKey(int pos, const SigningProvider& arg, FlatSigningProvider& out, const DescriptorCache* read_cache = nullptr, DescriptorCache* write_cache = nullptr) const override
     {
         KeyOriginInfo info;