Default constructor for jwks object (#346)

* correct invalid link to traits.md

* default constructor for jwks

* Update comment of default constructor

* apply automatically generated patch from CI. Damn, that's cool

* test JWKs default c'tor using deduced jwt::jwk from available traits

* rm unused type_traits from test

* apply auto format to jwkstest

---------

Co-authored-by: Chris Mc <prince.chrismc@gmail.com>

docs/install.md

@@ -31,7 +31,7 @@ The minimum is `jwt.h` but you will need to add the defines:
 - [`JWT_DISABLE_BASE64`](https://github.com/Thalhammer/jwt-cpp/blob/c9a511f436eaa13857336ebeb44dbc5b7860fe01/include/jwt-cpp/jwt.h#L11)
 - [`JWT_DISABLE_PICOJSON`](https://github.com/Thalhammer/jwt-cpp/blob/c9a511f436eaa13857336ebeb44dbc5b7860fe01/include/jwt-cpp/jwt.h#L4)
 
-In addition to providing your own JSON traits implementation, see [traits.md](traits.ms) for more information.
+In addition to providing your own JSON traits implementation, see [traits.md](traits.md) for more information.
 
 ### CMake
 

include/jwt-cpp/jwt.h

@@ -3798,6 +3798,11 @@ namespace jwt {
 		using iterator = typename jwks_vector_t::iterator;
 		using const_iterator = typename jwks_vector_t::const_iterator;
 
+		/**
+		 * Default constructor producing an empty object without any keys
+		 */
+		jwks() = default;
+
 		/**
 		 * Parses a string buffer to extract the JWKS.
 		 * \param str buffer containing JSON object representing a JWKS

tests/JwksTest.cpp

@@ -117,6 +117,15 @@ TEST(JwksTest, Missingx5c) {
 	ASSERT_EQ(jwk3.get_x5c_key_value(), "1");
 }
 
+TEST(JwksTest, DefaultConstructor) {
+	using Jwks = decltype(jwt::parse_jwks(std::declval<std::string>()));
+
+	Jwks keys{};
+	ASSERT_EQ(keys.begin(), keys.end());
+	ASSERT_FALSE(keys.has_jwk(""));
+	ASSERT_FALSE(keys.has_jwk("random-jwt"));
+}
+
 TEST(JwksTest, CachingBasedOnKid) {
 	std::string public_key = R"({
 	"keys": [{
@@ -149,4 +158,4 @@ TEST(JwksTest, CachingBasedOnKid) {
 	}
 
 	ASSERT_EQ(xs.size(), 2);
-}
+}