Update token signers to use HMAC signature and add tests

[Jonno12345]

Overhaul to all signers to bring them all in line and accurate, using latest signature pattern.

Updated readme and added CI tests.

[Copilot]

Pull request overview

This PR standardizes BunnyCDN token URL signing across multiple language implementations by switching to an HMAC-SHA256-based signature format, adds cross-language deterministic test vectors, and introduces CI to run the new test suites.

Changes:

• Updated signers (C#, Python, Node.js, PHP, Java) to generate HS256- prefixed base64url (no padding) HMAC-SHA256 tokens.
• Added/updated unit tests in each language to validate identical expected signed URLs.
• Added GitHub Actions workflow and language-specific test dependencies/config (pytest, node:test, PHPUnit, Maven/JUnit).

Reviewed changes

Copilot reviewed 22 out of 24 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
README.md	New consolidated documentation for token format, parameters, and quick starts.
python3/token.py	Rewritten Python signer using HMAC-SHA256 with parameter sorting and validation.
python3/test_token.py	Adds pytest coverage with fixed-time expectations for multiple signing scenarios.
python3/requirements-test.txt	Declares pytest as the Python test dependency.
php/url_signing.php	Rewritten PHP signer using HMAC-SHA256 with stricter query parsing/validation.
php/tests/TokenSignerTest.php	Adds PHPUnit test vectors aligned with other languages.
php/phpunit.xml	PHPUnit configuration for running the new PHP tests.
php/composer.json	Adds PHPUnit as a dev dependency and autoloads the signer file.
nodejs/token.js	Rewritten Node signer using HMAC-SHA256 with sorted parameters and validations.
nodejs/token.test.js	Adds node:test-based test vectors aligned with other languages.
nodejs/package.json	Adds a Node test script for CI/local runs.
java/src/main/java/BunnyCDN/TokenSigner.java	New Maven-structured Java signer using HMAC-SHA256 and sorted params.
java/src/test/java/BunnyCDN/TokenSignerTest.java	Adds JUnit test vectors aligned with other languages.
java/src/BunnyCDN/TokenSigner.java	Removes the legacy Java implementation (and external deps) in favor of the new one.
java/pom.xml	Introduces Maven build/test configuration with JUnit Jupiter.
java/EXAMPLES/Example.java	Updates example usage to the new static signing API.
c#/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication/TokenSigner.cs	Replaces old hashing approach with HMAC-SHA256, adds ignore-params and query parsing logic.
c#/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication/TokenConfig.cs	Adds IgnoreParams and defaults UserIp to empty string.
c#/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication.csproj	Removes Flurl dependency; targets net6.0 + netstandard2.0.
c#/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication.Tests/TokenSignerTests.cs	Updates expected tokens and adds additional scenario/validation tests.
c#/BunnyCDN.TokenAuthentication/BunnyCDN.TokenAuthentication.Tests/BunnyCDN.TokenAuthentication.Tests.csproj	Updates test target frameworks and normalizes project formatting.
.github/workflows/tests.yml	Adds CI jobs to run tests across C#, Python, Node.js, PHP, and Java.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.