1 files changed, 84 insertions, 0 deletions
diff --git a/keystore/grant_store.cpp b/keystore/grant_store.cpp
new file mode 100644
index 00000000..9c2e591e
--- /dev/null
+++ b/keystore/grant_store.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "grant_store.h"
+
+#include <algorithm>
+#include <sstream>
+
+namespace keystore {
+
+static constexpr uint64_t kInvalidGrantNo = std::numeric_limits<uint64_t>::max();
+static const char* kKeystoreGrantInfix = "_KEYSTOREGRANT_";
+static constexpr size_t kKeystoreGrantInfixLength = 15;
+
+Grant::Grant(const std::string& alias, const std::string& key_file, const uint64_t grant_no)
+        : alias_(alias), key_file_(key_file), grant_no_(grant_no) {}
+
+static std::pair<uint64_t, std::string> parseGrantAlias(const std::string& grantAlias) {
+    auto pos = grantAlias.rfind(kKeystoreGrantInfix);
+    if (pos == std::string::npos) return {kInvalidGrantNo, ""};
+    std::stringstream s(grantAlias.substr(pos + kKeystoreGrantInfixLength));
+    std::string wrapped_alias = grantAlias.substr(0, pos);
+    uint64_t grant_no = kInvalidGrantNo;
+    s >> grant_no;
+    if (s.fail() || grant_no == kInvalidGrantNo) return {kInvalidGrantNo, ""};
+    return {grant_no, wrapped_alias};
+}
+
+std::string GrantStore::put(const uid_t uid, const std::string& alias, const std::string& key_file) {
+    std::stringstream s;
+    s << alias << kKeystoreGrantInfix;
+    auto& uid_grant_list = grants_[uid];
+
+    bool success = false;
+    auto iterator = std::find_if(uid_grant_list.begin(), uid_grant_list.end(),
+            [&](auto& entry) {
+                return success = entry.alias_ == alias && entry.key_file_ == key_file;
+            });
+    while (!success) {
+        std::tie(iterator, success) = uid_grant_list.emplace(alias, key_file, std::rand());
+    }
+    s << iterator->grant_no_;
+    return s.str();
+}
+
+const Grant* GrantStore::get(const uid_t uid, const std::string& alias) const {
+    uint64_t grant_no;
+    std::string wrappedAlias;
+    std::tie(grant_no, wrappedAlias) = parseGrantAlias(alias);
+    if (grant_no == kInvalidGrantNo) return nullptr;
+    auto uid_set_iter = grants_.find(uid);
+    if (uid_set_iter == grants_.end()) return nullptr;
+    auto& uid_grant_list = uid_set_iter->second;
+    auto grant = uid_grant_list.find(grant_no);
+    if (grant == uid_grant_list.end()) return nullptr;
+    if (grant->alias_ != wrappedAlias) return nullptr;
+    return &(*grant);
+}
+
+bool GrantStore::removeByFileName(const uid_t uid, const std::string& fileName) {
+    auto& uid_grant_list = grants_.operator[](uid);
+    for (auto i = uid_grant_list.begin(); i != uid_grant_list.end(); ++i) {
+        if (i->key_file_ == fileName) {
+            uid_grant_list.erase(i);
+            return true;
+        }
+    }
+    return false;
+}
+
+}  // namespace keystore