Create wallet RPCs for PSBT

walletprocesspsbt takes a PSBT format transaction, updates the
PSBT with any inputs related to this wallet, signs, and finalizes
the transaction. There is also an option to not sign and just
update.

walletcreatefundedpsbt creates a PSBT from user provided data
in the same form as createrawtransaction. It also funds the transaction
and takes an options argument in the same form as fundrawtransaction.
The resulting PSBT is blank with no input or output data filled
in.

2 files changed, 21 insertions, 0 deletions

diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index f9907f5e00..f1ac1f411a 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -614,3 +614,13 @@ void PSBTOutput::Merge(const PSBTOutput& output)
     if (redeem_script.empty() && !output.redeem_script.empty()) redeem_script = output.redeem_script;
     if (witness_script.empty() && !output.witness_script.empty()) witness_script = output.witness_script;
 }
+
+bool PublicOnlySigningProvider::GetCScript(const CScriptID &scriptid, CScript& script) const
+{
+    return m_provider->GetCScript(scriptid, script);
+}
+
+bool PublicOnlySigningProvider::GetPubKey(const CKeyID &address, CPubKey& pubkey) const
+{
+    return m_provider->GetPubKey(address, pubkey);
+}
diff --git a/src/script/sign.h b/src/script/sign.h
index 9f0382e257..e3a6196b28 100644
--- a/src/script/sign.h
+++ b/src/script/sign.h
@@ -32,6 +32,17 @@ public:
 
 extern const SigningProvider& DUMMY_SIGNING_PROVIDER;
 
+class PublicOnlySigningProvider : public SigningProvider
+{
+private:
+    const SigningProvider* m_provider;
+
+public:
+    PublicOnlySigningProvider(const SigningProvider* provider) : m_provider(provider) {}
+    bool GetCScript(const CScriptID &scriptid, CScript& script) const;
+    bool GetPubKey(const CKeyID &address, CPubKey& pubkey) const;
+};
+
 /** Interface for signature creators. */
 class BaseSignatureCreator {
 public: