# Verify Nexmo Signatures Rack Middleware
Integrate this middleware into your application to verify [Nexmo signatures](https://developer.nexmo.com/concepts/guides/signing-messages).

* [Dependencies](#requirements)
* [Installation and Usage](#installation-and-usage)
    * [As a standalone application](#as-a-standalone-application)
    * [Mounted into a Rails application](#mounted-into-a-rails-application)
* [Contributing](#contributing)
* [License](#license)

## Dependencies

This middleware utilizes the following dependencies:

* [JWT](https://github.com/jwt/ruby-jwt)
* [Digest](https://github.com/ruby/digest)

## Installation and Usage

The verify signature middleware can be used standalone or integrated into a Ruby application. The middleware will return a `403` HTTP status code if the signature is not valid, and will continue the application if it is valid.

### As a standalone application

Install the gem on your system:

``` shell
$ gem install verify_nexmo_signature
```

Then require it from within your `config.ru` Rack configuration:

``` ruby
use VerifyNexmoSignature::Middleware
```

An example [config.ru](examples/config.ru.example) can be found in the examples folder. More information on getting up and running with Rack can be found at the [Rack GitHub repository](https://github.com/rack/rack/wiki/(tutorial)-rackup-howto#with-a-ru-config-file).

### Mounted into a Rails Application

Require it in your `Gemfile`:

```ruby
gem verify_nexmo_signature
```

And then add the middleware to your `config/application.rb` file to initialize it with your application:

```ruby
config.middleware.use VerifyNexmoSignature::Middleware
```

## Contributing
We ❤️ contributions from everyone! [Bug reports](https://github.com/Nexmo/rack-verify-signature-middleware/issues), [bug fixes](https://github.com/Nexmo/rack-verify-signature-middleware/pulls) and feedback on the library is always appreciated. Look at the [Contributor Guidelines](https://github.com/Nexmo/rack-verify-signature-middleware/blob/master/CONTRIBUTING.md) for more information.

## License
This project is under the [MIT LICENSE](https://github.com/Nexmo/rack-verify-signature-middleware/blob/master/LICENSE).


verify_nexmo_signature

Nexmo

(Experimental) An ambiguous license classifier was found.

What is an ambiguous license classifier?

Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

What is bad text encoding?

Bad text encoding

Package version is not a valid semantic version (semver).

What is bad semver?

Bad semver

Package has dependencies with an invalid semantic version. This could be a sign of beta, low quality, or unmaintained dependencies.

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Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

What are bidirectional unicode control characters?

Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

What is bin script confusion?

Bin script confusion

This Chrome extension includes content scripts that execute JavaScript on specified websites.

What are Chrome extension content scripts?

Chrome Extension Content Script

This Chrome extension requests host permissions to access specific websites or domains.

What are Chrome extension host permissions?

Chrome Extension Host Permission

This Chrome extension requests permissions to access browser APIs, user data, or system features.

What are Chrome extension permissions?

Chrome Extension Permission

This Chrome extension requests wildcard host permissions that grant broad access to websites.

What are Chrome extension wildcard host permissions?

Chrome Extension Wildcard Host Permission

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

(Experimental) Copyleft license information was found.

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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Title

Critical CVE

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High CVE

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Deprecated

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What is a deprecated SPDX exception?

Deprecated SPDX exception

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Deprecated license

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File dependency

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Filesystem access

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Wildcard dependency

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Alert title

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Git dependency

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Why is native code a concern?

Native code

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What are high entropy strings?

High entropy strings

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What are unicode homoglyphs?

Unicode homoglyphs

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What are http dependencies?

HTTP dependency

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Install scripts

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What is an invalid manifest file?

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Invisible chars

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License Policy Violation

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Modified license exception

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What is a modified license?

Modified license

What is network access?

Network access

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What is new author?

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Why is contributor and author data important?

No contributors or author data

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No bug tracker

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No README

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verify_nexmo_signature

Verify Nexmo Signatures Rack Middleware

Dependencies

Installation and Usage

As a standalone application

Mounted into a Rails Application

Contributing

License

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