Readme changes for example code and fixed header decoding

2025-05-14 16:58:34 +00:00 · 2017-12-29 16:26:37 +05:30 · 2017-12-29 16:26:37 +05:30 · 6302055db1
commit 6302055db1
parent 1236071a4f
22 changed files with 1077 additions and 6 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -17,3 +17,5 @@ link_directories(${OPENSSL_LIBRARIES})
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--- a/README.md
+++ b/README.md
@ -37,3 +37,52 @@ Few good resources on this material which I found useful are:
  - <a href="https://scotch.io/tutorials/the-anatomy-of-a-json-web-token">Anatomy of JWT</a>
  - <a href="https://auth0.com/learn/json-web-tokens/">Learn JWT</a> 
  - <a href="https://tools.ietf.org/html/rfc7519">RFC 7519</a>
+
+
+## Example
+  Lets dive into see a simple example of encoding and decoding in Python. Taking the example of <strong>pyjwt</strong> module from its docs.
+
+  ```python
+  >>import jwt
+  >>key = 'secret'
+  >>
+  >>encoded = jwt.encode({'some': 'payload'}, key, algorithm='HS256')
+  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzb21lIjoicGF5bG9hZCJ9.4twFt5NiznN84AWoo1d7KO1T_yoc0Z6XOpOVswacPZg'
+  >>
+  >>decoded = jwt.decode(encoded, key, algorithms='HS256')
+  {'some': 'payload'}
+  ```
+
+  Now, lets look at our C++ code doing the same thing.
+  ```cpp
+  #include <iostream>
+  #include "jwt/jwt.hpp"
+
+  int main() {
+    using namespace jwt::params;
+
+    auto key = "secret"; //Secret to use for the algorithm
+    //Create JWT object
+    jwt::jwt_object obj{algorithm("HS256"), payload({{"some", "payload"}}), secret(key)};
+
+    //Get the encoded string/assertion
+    auto enc_str = obj.signature();
+    std::cout << enc_str << std::endl;
+
+    //Decode
+    auto dec_obj = jwt::decode(enc_str, algorithms({"hs256"}), secret(key));
+    std::cout << dec_obj.header() << std::endl;
+    std::cout << dec_obj.payload() << std::endl;
+
+    return 0;
+  }
+  ```
+
+  It outputs:
+  ```
+  eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzb21lIjoicGF5bG9hZCJ9.4twFt5NiznN84AWoo1d7KO1T_yoc0Z6XOpOVswacPZg
+  {"alg":"HS256","typ":"JWT"}
+  {"some":"payload"}
+  ```
+
+  Almost the same API, except for some ugliness here and there. But close enough!
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+
--- a/examples/simple_ex1
+++ b/examples/simple_ex1
--- a/examples/simple_ex1.cc
+++ b/examples/simple_ex1.cc
@ -0,0 +1,21 @@
+#include <iostream>
+#include "jwt/jwt.hpp"
+
+int main() {
+  using namespace jwt::params;
+
+  auto key = "secret"; //Secret to use for the algorithm
+  //Create JWT object
+  jwt::jwt_object obj{algorithm("HS256"), payload({{"some", "payload"}}), secret(key)};
+
+  //Get the encoded string/assertion
+  auto enc_str = obj.signature();
+  std::cout << enc_str << std::endl;
+
+  //Decode
+  auto dec_obj = jwt::decode(enc_str, algorithms({"HS256"}), secret(key));
+  std::cout << dec_obj.header() << std::endl;
+  std::cout << dec_obj.payload() << std::endl;
+
+  return 0;
+}
--- a/include/jwt/impl/jwt.ipp
+++ b/include/jwt/impl/jwt.ipp
@ -67,18 +67,17 @@ void jwt_header::decode(const jwt::string_view enc_str, std::error_code& ec)
 {
  ec.clear();
  std::string json_str = base64_decode(enc_str);
-  json_t obj;

  try {
-    obj = json_t::parse(std::move(json_str));
+    payload_ = json_t::parse(std::move(json_str));
  } catch(const std::exception& e) {
    ec = DecodeErrc::JsonParseError;
    return;
  }

  //Look for the algorithm field
-  auto alg_itr = obj.find("alg");
-  if (alg_itr == obj.end()) {
+  auto alg_itr = payload_.find("alg");
+  if (alg_itr == payload_.end()) {
    ec = DecodeErrc::AlgHeaderMiss;
    return;
  }
@ -87,13 +86,14 @@ void jwt_header::decode(const jwt::string_view enc_str, std::error_code& ec)

  if (alg_ != algorithm::NONE)
  {
-    auto itr = obj.find("typ");
-    if (itr == obj.end()) {
+    auto itr = payload_.find("typ");
+    if (itr == payload_.end()) {
      ec = DecodeErrc::TypHeaderMiss;
      return;
    }

    const auto& typ = itr.value().get<std::string>();
+
    if (strcasecmp(typ.c_str(), "JWT")) {
      ec = DecodeErrc::TypMismatch;
      return;
@ -104,6 +104,15 @@ void jwt_header::decode(const jwt::string_view enc_str, std::error_code& ec)
    //TODO:
  }

+  // Populate header
+  for (auto it = payload_.begin(); it != payload_.end(); ++it) {
+    auto ret = headers_.insert(it.key());
+    if (!ret.second) {
+      ec = DecodeErrc::DuplClaims;
+      break;
+    }
+  }
+
  return;
 }

--- a/tests/test_jwt_encode
+++ b/tests/test_jwt_encode
--- a/tests/test_jwt_encode.cc
+++ b/tests/test_jwt_encode.cc
@ -282,6 +282,14 @@ TEST (EncodeTest, HeaderParamTest)
  EXPECT_TRUE (ret);

  std::cout << obj.header() << std::endl;
+
+  std::error_code ec;
+  auto enc_str = obj.signature();
+
+  auto dec_obj = jwt::decode(enc_str, algorithms({"none"}), ec, verify(false));
+  EXPECT_EQ (ec.value(), static_cast<int>(jwt::AlgorithmErrc::NoneAlgorithmUsed));
+
+  std::cout << dec_obj.header() << std::endl;
 }

 int main(int argc, char **argv)
				`@ -0,0 +1 @@`
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