Class: Passage::Auth

Inherits:
Object
  • Object
show all
Defined in:
lib/passageidentity/auth.rb

Constant Summary collapse

@@app_cache = 
{}

Instance Method Summary collapse

Constructor Details

#initialize(app_id, auth_strategy, connection) ⇒ Auth

Returns a new instance of Auth.



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# File 'lib/passageidentity/auth.rb', line 9

def initialize(app_id, auth_strategy, connection)
  @app_id = app_id
  @auth_strategy = auth_strategy
  @connection = connection

  fetch_jwks
end

Instance Method Details

#authenticate_request(request) ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 54

def authenticate_request(request)
  # Get the token based on the strategy
  if @auth_strategy === Passage::COOKIE_STRATEGY
    unless request.cookies["psg_auth_token"].present?
      raise PassageError.new(
              message:
                `missing authentication token: expected "psg_auth_token" cookie`
            )
    end
    @token = request.cookies["psg_auth_token"]
  else
    headers = request.headers
    unless headers["Authorization"].present?
      raise PassageError.new(message: "no authentication token in header")
    end
    @token = headers["Authorization"].split(" ").last
  end

  # authenticate the token
  if @token
    return authenticate_token(@token)
  else
    raise PassageError.new(message: "no authentication token")
  end
  nil
end

#authenticate_token(token) ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 81

def authenticate_token(token)
  kid = JWT.decode(token, nil, false)[1]["kid"]
  exists = false
  for jwk in @jwks["keys"]
    if jwk["kid"] == kid
      exists = true
      break
    end
  end
  fetch_jwks unless exists
  begin
    claims =
      JWT.decode(
        token,
        nil,
        true,
        {
          aud: @auth_origin,
          verify_aud: true,
          algorithms: ["RS256"],
          jwks: @jwks
        }
      )
    return claims[0]["sub"]
  rescue JWT::InvalidIssuerError => e
    raise PassageError.new(message: e.message)
  rescue JWT::InvalidAudError => e
    raise PassageError.new(e.message)
  rescue JWT::ExpiredSignature => e
    raise PassageError.new(e.message)
  rescue JWT::IncorrectAlgorithm => e
    raise PassageError.new(e.message)
  rescue JWT::DecodeError => e
    raise PassageError.new(e.message)
  end
end

#fetch_app ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 17

def fetch_app()
  begin
    response = @connection.get("/v1/apps/#{@app_id}")
    return response.body["app"]
  rescue Faraday::Error => e
    raise PassageError.new(
            message: "failed to fetch passage app",
            status_code: e.response[:status],
            body: e.response[:body]
          )
  end
end

#fetch_jwks ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 30

def fetch_jwks()
  if @@app_cache[@app_id]
    @jwks, @auth_origin = @@app_cache[@app_id]
  else
    app = fetch_app
    auth_gw_connection =
      Faraday.new(url: "https://auth.passage.id") do |f|
        f.request :json
        f.request :retry
        f.response :raise_error
        f.response :json
        f.adapter :net_http
      end

    # fetch the public key if not in cache
    app = fetch_app
    @auth_origin = app["auth_origin"]
    response =
      auth_gw_connection.get("/v1/apps/#{@app_id}/.well-known/jwks.json")
    @jwks = response.body
    @@app_cache[@app_id] ||= [@jwks, @auth_origin]
  end
end