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README.md

C++ Request Verification

This example demonstrates how to verify webhook, app event, and app action requests from Contentful using HMAC-SHA256 in C++ with the Drogon web framework. The server computes a signature from the request's method, path, headers, and body, then compares it to the signature provided by Contentful.

Requirements

  • C++17 or higher
  • Drogon
  • OpenSSL (for HMAC computation)

Setup

  1. Install Drogon and OpenSSL: Follow the instructions to install Drogon and OpenSSL for your environment.

  2. Set the CONTENTFUL_SIGNING_SECRET environment variable:

export CONTENTFUL_SIGNING_SECRET="your_contentful_signing_secret_here"
  1. Build the application:
mkdir build
cd build
cmake ..
make
  1. Run the application:
./contentful_request_verification

The server will start on http://0.0.0.0:8080.

Code Overview

  • computeSignature: Computes the HMAC-SHA256 signature using the OpenSSL library.
  • verifyRequestHandler: Handles incoming requests, constructs the canonical string, and verifies the signature.
  • CMakeLists.txt: Configures the C++ project, including dependencies on Drogon and OpenSSL.