[Project] Add helper library to handle mime strings in a more safe matter

1 files changed, 99 insertions, 0 deletions

diff --git a/src/libmime/mime_string.cxx b/src/libmime/mime_string.cxx
new file mode 100644
index 000000000..1785e9188
--- /dev/null
+++ b/src/libmime/mime_string.cxx
@@ -0,0 +1,99 @@
+/*-
+ * Copyright 2021 Vsevolod Stakhov
+ *
+ * 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.
+ */
+
+#define DOCTEST_CONFIG_IMPLEMENTATION_IN_DLL
+#include "doctest/doctest.h"
+#include "mime_string.hxx"
+#include "unicode/uchar.h"
+
+TEST_SUITE("mime_string") {
+TEST_CASE("mime_string unfiltered ctors")
+{
+	SUBCASE("empty") {
+		rspamd::mime_string st;
+		CHECK(st.size() == 0);
+		CHECK(st == "");
+	}
+	SUBCASE("unfiltered valid") {
+		rspamd::mime_string st{std::string_view("abcd")};
+		CHECK(st == "abcd");
+	}
+	SUBCASE("unfiltered zero character") {
+		rspamd::mime_string st{"abc\0d", 5};
+		CHECK(st.has_zeroes());
+		CHECK(st == "abcd");
+	}
+	SUBCASE("unfiltered invalid character - middle") {
+		rspamd::mime_string st{std::string("abc\234d")};
+		CHECK(st.has_invalid());
+		CHECK(st == "abc\uFFFDd");
+	}
+	SUBCASE("unfiltered invalid character - end") {
+		rspamd::mime_string st{std::string("abc\234")};
+		CHECK(st.has_invalid());
+		CHECK(st == "abc\uFFFD");
+	}
+	SUBCASE("unfiltered invalid character - start") {
+		rspamd::mime_string st{std::string("\234abc")};
+		CHECK(st.has_invalid());
+		CHECK(st == "\uFFFDabc");
+	}
+}
+
+TEST_CASE("mime_string filtered ctors")
+{
+	auto print_filter = [](UChar32 inp) -> UChar32 {
+		if (!u_isprint(inp)) {
+			return 0;
+		}
+
+		return inp;
+	};
+
+	auto tolower_filter = [](UChar32 inp) -> UChar32 {
+		return u_tolower(inp);
+	};
+
+	SUBCASE("empty") {
+		rspamd::mime_string st{std::string_view(""), tolower_filter};
+		CHECK(st.size() == 0);
+		CHECK(st == "");
+	}
+	SUBCASE("filtered valid") {
+		rspamd::mime_string st{std::string("AbCdУ"), tolower_filter};
+		CHECK(st == "abcdу");
+	}
+	SUBCASE("filtered invalid + filtered") {
+		rspamd::mime_string st{std::string("abcd\234\1"), print_filter};
+		CHECK(st == "abcd\uFFFD");
+	}
+}
+TEST_CASE("mime_string assign")
+{
+	SUBCASE("assign from valid") {
+		rspamd::mime_string st;
+
+		CHECK(st.assign_if_valid(std::string("test")));
+		CHECK(st == "test");
+	}
+	SUBCASE("assign from invalid") {
+		rspamd::mime_string st;
+
+		CHECK(!st.assign_if_valid(std::string("test\234t")));
+		CHECK(st == "");
+	}
+}
+}
\ No newline at end of file