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) ⇒ Auth

Returns a new instance of Auth.



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# File 'lib/passageidentity/auth.rb', line 10

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

  fetch_jwks
end

Instance Method Details

#authenticate_request(request) ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 57

def authenticate_request(request)
  warn "[DEPRECATION] `auth.authenticate_request()` is deprecated.  Please use `auth.validate_jwt()` instead."

  # Get the token based on the strategy
  if @auth_strategy === Passage::COOKIE_STRATEGY
    unless request.cookies.key?("psg_auth_token")
      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.key?("Authorization")
      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 94

def authenticate_token(token)
  begin
    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
    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(message: e.message)
  rescue JWT::ExpiredSignature => e
    raise PassageError.new(message: e.message)
  rescue JWT::IncorrectAlgorithm => e
    raise PassageError.new(message: e.message)
  rescue JWT::DecodeError => e
    raise PassageError.new(message: e.message)
  end
end

#fetch_app ⇒ Object 



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

def fetch_app()
  begin
    client = OpenapiClient::AppsApi.new
    response = client.get_app(@app_id)
    
    return response.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 32

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

#revoke_user_refresh_tokens(user_id) ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 131

def revoke_user_refresh_tokens(user_id)
  begin
    client = OpenapiClient::TokensApi.new
    response = client.revoke_user_refresh_tokens(@app_id, user_id)
    return true
  rescue Faraday::Error => e
    raise PassageError.new(
            message: "failed to revoke user's refresh tokens",
            status_code: e.response[:status],
            body: e.response[:body]
          )
  end
end

#validate_jwt(token) ⇒ Object 



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# File 'lib/passageidentity/auth.rb', line 86

def validate_jwt(token)
  if token
    return authenticate_token(token)
  else
    raise PassageError.new(message: "no authentication token")
  end
end