UA Inspector

User agent parser library.

Setup

Dependency

To use UA Inspector with your projects, edit your mix.exs file and add the required dependencies:

defp deps do
  [ { :ua_inspector, "~> 0.11" },
    { :yamerl,       github: "yakaz/yamerl" } ]
end

You should also update your applications to include all necessary projects:

def application do
  [ applications: [ :ua_inspector ]]
end

Parser Databases

Using mix ua_inspector.download.databases you can store local copies of the supported parser databases in the configured path. The databases are taken from the piwik/device-detector project.

In addition to the parser databases you need to fetch the short code maps using mix ua_inspector.download.short_code_maps. After conversion to yaml files they are stored in the configured database directory.

The local path of the downloaded files will be shown to you upon command invocation.

Configuration

Add the path to the user agent database you want to use to your project configuration:

use Mix.Config

# static configuration
config :ua_inspector,
  database_path: Path.join(Mix.Utils.mix_home, "ua_inspector")

# system environment configuration
config :ua_inspector,
  database_path: { :system, "SOME_SYSTEM_ENV_VARIABLE" }

The shown path is the default download path used by the mix task.

Usage

iex(1)> UAInspector.parse("Mozilla/5.0 (iPad; CPU OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53")
%UAInspector.Result{
  user_agent: "Mozilla/5.0 (iPad; CPU OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53"
  client: %UAInspector.Result.Client{
    engine:  "WebKit",
    name:    "Mobile Safari",
    type:    "browser",
    version: "7.0"
  },
  device: %UAInspector.Result.Device{
    brand: "Apple",
    model: "iPad",
    type:  "tablet"
  },
  os: %UAInspector.Result.OS{
    name:     "iOS",
    platform: :unknown,
    version:  "7.0.4"
  },
}

iex(2)> UAInspector.parse("Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36")
%UAInspector.Result.Bot{
  user_agent: "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36",
  category:   "Search bot",
  name:       "Googlebot",
  producer: %UAInspector.Result.BotProducer{
    name: "Google Inc.",
    url:  "http://www.google.com"
  },
  url: "http://www.google.com/bot.html"
}

iex(3)> UAInspector.parse("generic crawler agent")
%UAInspector.Result.Bot{
  user_agent: "generic crawler agent",
  name:       "Generic Bot"
}

iex(4)> UAInspector.parse("--- undetectable ---")
%UAInspector.Result{
  user_agent: "--- undetectable ---",
  client:     :unknown,
  device:     %UAInspector.Result.Device{ type: "desktop" },
  os:         :unknown
}

The map key user_agent will hold the unmodified passed user agent.

If the device type cannot be determined a "desktop" :type will be assumed (and returned). Both :brand and :model are set to :unknown.

When a bot agent is detected the result with be a UAInspector.Result.Bot struct instead of UAInspector.Result.

Convenience Methods

To perform only a quick check if a user agents belongs to a bot:

iex(1)> UAInspector.bot? "generic crawler agent"
true

iex(2)> UAInspector.bot? "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"
false

To parse the client information for a user without checking for bots:

iex(1)> UAInspector.bot? "generic crawler agent"
%UAInspector.Result{
  user_agent: "generic crawler agent"
  client:     :unknown,
  device:     %UAInspector.Result.Device{},
  os:         :unknown
}

Testing

Some (mix task) tests may download files from the internet. These tests are all tagged :download to allow skipping them.

Resources

License

Apache License, Version 2.0

The parser databases are taken from the piwik/device-detector project. See there for detailed license information about the data contained.

pollingj / ua_inspector