1 files changed, 113 insertions, 0 deletions
diff --git a/src/libstore/path-info.cc b/src/libstore/path-info.cc
index cb3077c61..2972c0bbe 100644
--- a/src/libstore/path-info.cc
+++ b/src/libstore/path-info.cc
@@ -3,6 +3,117 @@
 
 namespace nix {
 
+std::string ValidPathInfo::fingerprint(const Store & store) const
+{
+    if (narSize == 0)
+        throw Error("cannot calculate fingerprint of path '%s' because its size is not known",
+            store.printStorePath(path));
+    return
+        "1;" + store.printStorePath(path) + ";"
+        + narHash.to_string(Base32, true) + ";"
+        + std::to_string(narSize) + ";"
+        + concatStringsSep(",", store.printStorePathSet(referencesPossiblyToSelf()));
+}
+
+
+void ValidPathInfo::sign(const Store & store, const SecretKey & secretKey)
+{
+    sigs.insert(secretKey.signDetached(fingerprint(store)));
+}
+
+std::optional<StorePathDescriptor> ValidPathInfo::fullStorePathDescriptorOpt() const
+{
+    if (! ca)
+        return std::nullopt;
+
+    return StorePathDescriptor {
+        .name = std::string { path.name() },
+        .info = std::visit(overloaded {
+            [&](const TextHash & th) -> ContentAddressWithReferences {
+                assert(!references.self);
+                return TextInfo {
+                    th,
+                    .references = references.others,
+                };
+            },
+            [&](const FixedOutputHash & foh) -> ContentAddressWithReferences {
+                return FixedOutputInfo {
+                    foh,
+                    .references = references,
+                };
+            },
+        }, *ca),
+    };
+}
+
+bool ValidPathInfo::isContentAddressed(const Store & store) const
+{
+    auto fullCaOpt = fullStorePathDescriptorOpt();
+
+    if (! fullCaOpt)
+        return false;
+
+    auto caPath = store.makeFixedOutputPathFromCA(*fullCaOpt);
+
+    bool res = caPath == path;
+
+    if (!res)
+        printError("warning: path '%s' claims to be content-addressed but isn't", store.printStorePath(path));
+
+    return res;
+}
+
+
+size_t ValidPathInfo::checkSignatures(const Store & store, const PublicKeys & publicKeys) const
+{
+    if (isContentAddressed(store)) return maxSigs;
+
+    size_t good = 0;
+    for (auto & sig : sigs)
+        if (checkSignature(store, publicKeys, sig))
+            good++;
+    return good;
+}
+
+
+bool ValidPathInfo::checkSignature(const Store & store, const PublicKeys & publicKeys, const std::string & sig) const
+{
+    return verifyDetached(fingerprint(store), sig, publicKeys);
+}
+
+
+Strings ValidPathInfo::shortRefs() const
+{
+    Strings refs;
+    for (auto & r : referencesPossiblyToSelf())
+        refs.push_back(std::string(r.to_string()));
+    return refs;
+}
+
+
+ValidPathInfo::ValidPathInfo(
+    const Store & store,
+    StorePathDescriptor && info,
+    Hash narHash)
+      : path(store.makeFixedOutputPathFromCA(info))
+      , narHash(narHash)
+{
+    std::visit(overloaded {
+        [this](TextInfo && ti) {
+            this->references = {
+                .others = std::move(ti.references),
+                .self = false,
+            };
+            this->ca = std::move((TextHash &&) ti);
+        },
+        [this](FixedOutputInfo && foi) {
+            this->references = std::move(foi.references);
+            this->ca = std::move((FixedOutputHash &&) foi);
+        },
+    }, std::move(info.info));
+}
+
+
 StorePathSet ValidPathInfo::referencesPossiblyToSelf() const
 {
     return references.possiblyToSelf(path);
@@ -18,6 +129,7 @@ void ValidPathInfo::setReferencesPossiblyToSelf(StorePathSet && refs)
     return references.setPossiblyToSelf(path, std::move(refs));
 }
 
+
 ValidPathInfo ValidPathInfo::read(Source & source, const Store & store, unsigned int format)
 {
     return read(source, store, format, store.parseStorePath(readString(source)));
@@ -39,6 +151,7 @@ ValidPathInfo ValidPathInfo::read(Source & source, const Store & store, unsigned
     return info;
 }
 
+
 void ValidPathInfo::write(
     Sink & sink,
     const Store & store,