1 files changed, 439 insertions, 0 deletions
diff --git a/lib/irc/account.ex b/lib/irc/account.ex
new file mode 100644
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--- /dev/null
+++ b/lib/irc/account.ex
@@ -0,0 +1,439 @@
+defmodule IRC.Account do
+  alias IRC.UserTrack.User
+
+  @moduledoc """
+  Account registry....
+
+  Maps a network predicate:
+    * `{net, {:nick, nickname}}`
+    * `{net, {:account, account}}`
+    * `{net, {:mask, user@host}}`
+  to an unique identifier, that can be shared over multiple networks.
+
+  If a predicate cannot be found for an existing account, a new account will be made in the database.
+
+  To link two existing accounts from different network onto a different one, a merge operation is provided.
+
+  """
+
+  # FIXME: Ensure uniqueness of name?
+
+  defstruct [:id, :name, :token]
+  @type t :: %__MODULE__{id: String.t(), name: String.t()}
+
+  defimpl Inspect, for: __MODULE__ do
+    import Inspect.Algebra
+
+    def inspect(%{id: id, name: name}, opts) do
+      concat(["#IRC.Account[", id, " ", name, "]"])
+    end
+  end
+
+  def file(base) do
+    to_charlist(LSG.data_path() <> "/account_#{base}.dets")
+  end
+
+  defp from_struct(%__MODULE__{id: id, name: name, token: token}) do
+    {id, name, token}
+  end
+
+  defp from_tuple({id, name, token}) do
+    %__MODULE__{id: id, name: name, token: token}
+  end
+
+  def start_link() do
+    GenServer.start_link(__MODULE__, [], [name: __MODULE__])
+  end
+
+  def init(_) do
+    {:ok, accounts} = :dets.open_file(file("db"), [])
+    {:ok, meta} = :dets.open_file(file("meta"), [])
+    {:ok, predicates} = :dets.open_file(file("predicates"), [{:type, :set}])
+    {:ok, %{accounts: accounts, meta: meta, predicates: predicates}}
+  end
+
+  def get(id) do
+    case :dets.lookup(file("db"), id) do
+      [account] -> from_tuple(account)
+      _ -> nil
+    end
+  end
+
+  def get_by_name(name) do
+    spec = [{{:_, :"$1", :_}, [{:==, :"$1", {:const, name}}], [:"$_"]}]
+    case :dets.select(file("db"), spec) do
+      [account] -> from_tuple(account)
+      _ -> nil
+    end
+  end
+
+  def get_meta(%__MODULE__{id: id}, key, default \\ nil) do
+    case :dets.lookup(file("meta"), {id, key}) do
+      [{_, value}] -> (value || default)
+      _ -> default
+    end
+  end
+
+  @spec find_meta_accounts(String.t()) :: [{account :: t(), value :: String.t()}, ...]
+  @doc "Find all accounts that have a meta of `key`."
+  def find_meta_accounts(key) do
+    spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$2", {:const, key}}], [{{:"$1", :"$3"}}]}]
+    for {id, val} <- :dets.select(file("meta"), spec), do: {get(id), val}
+  end
+
+  @doc "Find an account given a specific meta `key` and `value`."
+  @spec find_meta_account(String.t(), String.t()) :: t() | nil
+  def find_meta_account(key, value) do
+    #spec = [{{{:"$1", :"$2"}, :"$3"}, [:andalso, {:==, :"$2", {:const, key}}, {:==, :"$3", {:const, value}}], [:"$1"]}]
+    spec = [{{{:"$1", :"$2"}, :"$3"}, [{:andalso, {:==, :"$2", {:const, key}}, {:==, {:const, value}, :"$3"}}], [:"$1"]}]
+    case :dets.select(file("meta"), spec) do
+      [id] -> get(id)
+      _ -> nil
+    end
+  end
+
+  def get_all_meta(%__MODULE__{id: id}) do
+    spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$1", {:const, id}}], [{{:"$2", :"$3"}}]}]
+    :dets.select(file("meta"), spec)
+  end
+
+  def put_user_meta(account = %__MODULE__{}, key, value) do
+    put_meta(account, "u:"<>key, value)
+  end
+
+  def put_meta(%__MODULE__{id: id}, key, value) do
+    :dets.insert(file("meta"), {{id, key}, value})
+  end
+
+  def delete_meta(%__MODULE__{id: id}, key) do
+    :dets.delete(file("meta"), {id, key})
+  end
+
+  def all_accounts() do
+    :dets.traverse(file("db"), fn(obj) -> {:continue, from_tuple(obj)} end)
+  end
+
+  def all_predicates() do
+    :dets.traverse(file("predicates"), fn(obj) -> {:continue, obj} end)
+  end
+
+  def all_meta() do
+    :dets.traverse(file("meta"), fn(obj) -> {:continue, obj} end)
+  end
+
+  def merge_account(old_id, new_id) do
+    if old_id != new_id do
+      spec = [{{:"$1", :"$2"}, [{:==, :"$2", {:const, old_id}}], [:"$1"]}]
+      predicates = :dets.select(file("predicates"), spec)
+      for pred <- predicates, do: :ok = :dets.insert(file("predicates"), {pred, new_id})
+      spec = [{{{:"$1", :"$2"}, :"$3"}, [{:==, :"$1", {:const, old_id}}], [{{:"$2", :"$3"}}]}]
+      metas = :dets.select(file("meta"), spec)
+      for {k,v} <- metas do
+        :dets.delete(file("meta"), {{old_id, k}})
+        :ok = :dets.insert(file("meta"), {{new_id, k}, v})
+      end
+      :dets.delete(file("db"), old_id)
+      IRC.Membership.merge_account(old_id, new_id)
+      IRC.UserTrack.merge_account(old_id, new_id)
+      IRC.Connection.dispatch("account", {:account_change, old_id, new_id})
+      IRC.Connection.dispatch("conn", {:account_change, old_id, new_id})
+    end
+    :ok
+  end
+
+  @doc "Find an account by a logged in user"
+  def find_by_nick(network, nick) do
+    do_lookup(%ExIRC.SenderInfo{nick: nick, network: network}, false)
+  end
+
+  @doc "Always find an account by nickname, even if offline. Uses predicates and then account name."
+  def find_always_by_nick(network, chan, nick) do
+    with \
+      nil <- find_by_nick(network, nick),
+         nil <- do_lookup(%User{network: network, nick: nick}, false),
+         nil <- get_by_name(nick)
+    do
+      nil
+    else
+      %__MODULE__{} = account ->
+        memberships = IRC.Membership.of_account(account)
+        if Enum.any?(memberships, fn({net, ch}) -> (net == network) or (chan && chan == ch) end) do
+          account
+        else
+          nil
+        end
+    end
+  end
+
+  def find(something) do
+    do_lookup(something, false)
+  end
+
+  def lookup(something, make_default \\ true) do
+    account = do_lookup(something, make_default)
+    if account && Map.get(something, :nick) do
+      IRC.Connection.dispatch("account", {:account_auth, Map.get(something, :nick), account.id})
+    end
+    account
+  end
+
+  def handle_info(_, state) do
+    {:noreply, state}
+  end
+
+  def handle_cast(_, state) do
+    {:noreply, state}
+  end
+
+  def handle_call(_, _, state) do
+    {:noreply, state}
+  end
+
+  def terminate(_, state) do
+    for {_, dets} <- state do
+      :dets.sync(dets)
+      :dets.close(dets)
+    end
+  end
+
+  defp do_lookup(message = %IRC.Message{account: account_id}, make_default) when is_binary(account_id) do
+    get(account_id)
+  end
+
+  defp do_lookup(sender = %ExIRC.Who{}, make_default) do
+    if user = IRC.UserTrack.find_by_nick(sender) do
+      lookup(user, make_default)
+    else
+      #FIXME this will never work with continued lookup by other methods as Who isn't compatible
+      lookup_by_nick(sender, :dets.lookup(file("predicates"), {sender.network,{:nick, sender.nick}}), make_default)
+    end
+  end
+
+  defp do_lookup(sender = %ExIRC.SenderInfo{}, make_default) do
+    lookup(IRC.UserTrack.find_by_nick(sender), make_default)
+  end
+
+  defp do_lookup(user = %User{account: id}, make_default) when is_binary(id) do
+    get(id)
+  end
+
+  defp do_lookup(user = %User{network: server, nick: nick}, make_default) do
+    lookup_by_nick(user, :dets.lookup(file("predicates"), {server,{:nick, nick}}), make_default)
+  end
+
+  defp do_lookup(nil, _) do
+    nil
+  end
+
+  defp lookup_by_nick(_, [{_, id}], _make_default) do
+    get(id)
+  end
+
+  defp lookup_by_nick(user, _, make_default) do
+    #authenticate_by_host(user)
+    if make_default, do: new_account(user), else: nil
+  end
+
+  defp new_account(%{nick: nick, network: server}) do
+    id = EntropyString.large_id()
+    :dets.insert(file("db"), {id, nick, EntropyString.token()})
+    :dets.insert(file("predicates"), {{server, {:nick, nick}}, id})
+    get(id)
+  end
+
+  def update_account_name(account = %__MODULE__{id: id}, name) do
+    account = %__MODULE__{account | name: name}
+    :dets.insert(file("db"), from_struct(account))
+    get(id)
+  end
+
+  def get_predicates(%__MODULE__{} = account) do
+    spec = [{{:"$1", :"$2"}, [{:==, :"$2", {:const, account.id}}], [:"$1"]}]
+    :dets.select(file("predicates"), spec)
+  end
+
+  defmodule AccountPlugin do
+    @moduledoc """
+    # Account
+
+    * **account** Get current account id and token
+    * **auth `<account-id>` `<token>`** Authenticate and link the current nickname to an account
+    * **auth** list authentications methods
+    * **whoami** list currently authenticated users
+    * **enable-sms** Link a SMS number
+    * **enable-telegram** Link a Telegram account
+    """
+
+    def irc_doc, do: @moduledoc
+    def start_link(), do: GenServer.start_link(__MODULE__, [], name: __MODULE__)
+    def init(_) do
+      {:ok, _} = Registry.register(IRC.PubSub, "message:private", [])
+      {:ok, nil}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{account: account, text: "help"}}, state) do
+      text = [
+        "account: show current account and auth token",
+        "auth: show authentications methods",
+        "whoami: list authenticated users",
+        "set-name <name>: set account name",
+        "web: login to web",
+        "enable-sms | disable-sms: enable/change or disable sms",
+        "enable-telegram: link/change telegram",
+        "enable-untappd: link untappd account",
+        "getmeta: show meta datas",
+        "setusermeta: set user meta",
+      ]
+      m.replyfun.(text)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{account: account, text: "auth"}}, state) do
+      spec = [{{:"$1", :"$2"}, [{:==, :"$2", {:const, account.id}}], [:"$1"]}]
+      predicates = :dets.select(IRC.Account.file("predicates"), spec)
+      text = for {net, {key, value}} <- predicates, do: "#{net}: #{to_string(key)}: #{value}"
+      m.replyfun.(text)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{account: account, text: "whoami"}}, state) do
+      users = for user <- IRC.UserTrack.find_by_account(m.account) do
+        chans = Enum.map(user.privileges, fn({chan, _}) -> chan end)
+                |> Enum.join(" ")
+        "#{user.network} - #{user.nick}!#{user.username}@#{user.host} - #{chans}"
+      end
+      m.replyfun.(users)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{account: account, text: "account"}}, state) do
+      account = IRC.Account.lookup(m.sender)
+      text = ["Account Id: #{account.id}",
+        "Authenticate to this account from another network: \"auth #{account.id} #{account.token}\" to the other bot!"]
+      m.replyfun.(text)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{sender: sender, text: "auth"<>_}}, state) do
+      #account = IRC.Account.lookup(m.sender)
+      case String.split(m.text, " ") do
+        ["auth", id, token] ->
+          join_account(m, id, token)
+        _ ->
+          m.replyfun.("Invalid parameters")
+      end
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{account: account, text: "set-name "<>name}}, state) do
+      IRC.Account.update_account_name(account, name)
+      m.replyfun.("Name changed: #{name}")
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "disable-sms"}}, state) do
+      if IRC.Account.get_meta(m.account, "sms-number") do
+        IRC.Account.delete_meta(m.account, "sms-number")
+        m.replfyun.("SMS disabled.")
+      else
+        m.replyfun.("SMS already disabled.")
+      end
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "web"}}, state) do
+      auth_url = Untappd.auth_url()
+      login_url = LSG.AuthToken.new_url(m.account.id, nil)
+      m.replyfun.("-> " <> login_url)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "enable-sms"}}, state) do
+      code = String.downcase(EntropyString.small_id())
+      IRC.Account.put_meta(m.account, "sms-validation-code", code)
+      IRC.Account.put_meta(m.account, "sms-validation-target", m.network)
+      number = LSG.IRC.SmsPlugin.my_number()
+      text = "To enable or change your number for SMS messaging, please send:"
+             <> " \"enable #{code}\" to #{number}"
+      m.replyfun.(text)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "enable-telegram"}}, state) do
+      code = String.downcase(EntropyString.small_id())
+      IRC.Account.delete_meta(m.account, "telegram-id")
+      IRC.Account.put_meta(m.account, "telegram-validation-code", code)
+      IRC.Account.put_meta(m.account, "telegram-validation-target", m.network)
+      text = "To enable or change your number for telegram messaging, please open #{LSG.Telegram.my_path()} and send:"
+             <> " \"/enable #{code}\""
+      m.replyfun.(text)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "enable-untappd"}}, state) do
+      auth_url = Untappd.auth_url()
+      login_url = LSG.AuthToken.new_url(m.account.id, {:external_redirect, auth_url})
+      m.replyfun.(["To link your Untappd account, open this URL:", login_url])
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "getmeta"<>_}}, state) do
+      result = case String.split(m.text, " ") do
+        ["getmeta"] ->
+          for {k, v} <- IRC.Account.get_all_meta(m.account) do
+            case k do
+              "u:"<>key -> "(user) #{key}: #{v}"
+              key -> "#{key}: #{v}"
+            end
+          end
+        ["getmeta", key] ->
+          value = IRC.Account.get_meta(m.account, key)
+          text = if value do
+            "#{key}: #{value}"
+          else
+            "#{key} is not defined"
+          end
+        _ ->
+          "usage: getmeta [key]"
+      end
+      m.replyfun.(result)
+      {:noreply, state}
+    end
+
+    def handle_info({:irc, :text, m = %IRC.Message{text: "setusermet"<>_}}, state) do
+      result = case String.split(m.text, " ") do
+        ["setusermeta", key, value] ->
+          IRC.Account.put_user_meta(m.account, key, value)
+          "ok"
+        _ ->
+          "usage: setusermeta <key> <value>"
+      end
+      m.replyfun.(result)
+      {:noreply, state}
+    end
+
+    def handle_info(_, state) do
+      {:noreply, state}
+    end
+
+    defp join_account(m, id, token) do
+      old_account = IRC.Account.lookup(m.sender)
+      new_account = IRC.Account.get(id)
+      if new_account && token == new_account.token do
+        case IRC.Account.merge_account(old_account.id, new_account.id) do
+          :ok ->
+            if old_account.id == new_account.id do
+              m.replyfun.("Already authenticated, but hello")
+            else
+              m.replyfun.("Accounts merged!")
+            end
+          _ -> m.replyfun.("Something failed :(")
+        end
+      else
+        m.replyfun.("Invalid token")
+      end
+    end
+
+  end
+
+end