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phoenix
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0.1.0
Productive. Reliable. Fast. A productive web framework that does not compromise speed or maintainability.
Security advisory:
This version has known vulnerabilities.
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Files
lib/phoenix/router/scope.ex
defmodule Phoenix.Router.Scope do
@moduledoc false
@stack :phoenix_router_scopes
@pipes :phoenix_pipeline_scopes
@doc """
Initializes the scope.
"""
def init(module) do
Module.put_attribute(module, @stack, [{nil, nil, nil, []}])
Module.put_attribute(module, @pipes, HashSet.new)
end
@doc """
Builds a route based on the top of the stack.
"""
def route(module, verb, path, controller, action, options) do
as = Keyword.get(options, :as, Phoenix.Naming.resource_name(controller, "Controller"))
{path, alias, as, pipe_through} = join(module, path, controller, as)
Phoenix.Router.Route.build(verb, path, alias, action, as, pipe_through)
end
@doc """
Defines the given pipeline.
"""
def pipeline(module, pipe) when is_atom(pipe) do
update_pipes module, &HashSet.put(&1, pipe)
end
@doc """
Appends the given pipes to the current scope pipe through.
"""
def pipe_through(module, pipes) do
pipes = List.wrap(pipes)
available = get_pipes(module)
Enum.each pipes, fn pipe ->
cond do
pipe == :before ->
raise ArgumentError, "the :before pipeline is always piped through"
pipe in available ->
:ok
true ->
raise ArgumentError, "unknown pipeline #{inspect pipe}"
end
end
update_stack(module, fn [scope|stack] ->
scope = put_elem(scope, 3, elem(scope, 3) ++ pipes)
[scope|stack]
end)
end
@doc """
Pushes a scope into the module stack.
"""
def push(module, path) when is_binary(path) do
push(module, path: path)
end
def push(module, opts) when is_list(opts) do
path = Keyword.get(opts, :path)
if path, do: path = Plug.Router.Utils.split(path)
alias = Keyword.get(opts, :alias)
if alias, do: alias = Atom.to_string(alias)
as = Keyword.get(opts, :as)
scope = {path, alias, as, []}
update_stack(module, fn stack -> [scope|stack] end)
end
@doc """
Pops a scope from the module stack.
"""
def pop(module) do
update_stack(module, fn [_|stack] -> stack end)
end
defp join(module, path, alias, as) do
stack = get_stack(module)
{join_path(stack, path), join_alias(stack, alias),
join_as(stack, as), join_pipe_through(stack)}
end
defp join_path(stack, path) do
"/" <>
([Plug.Router.Utils.split(path)|extract(stack, 0)]
|> Enum.reverse()
|> Enum.concat()
|> Enum.join("/"))
end
defp join_alias(stack, alias) when is_atom(alias) do
[alias|extract(stack, 1)]
|> Enum.reverse()
|> Module.concat()
end
defp join_as(_stack, nil), do: nil
defp join_as(stack, as) when is_atom(as) or is_binary(as) do
[as|extract(stack, 2)]
|> Enum.reverse()
|> Enum.join("_")
end
defp join_pipe_through(stack) do
for tuple <- Enum.reverse(stack),
item <- elem(tuple, 3),
do: item
end
defp extract(stack, pos) do
for tuple <- stack,
item = elem(tuple, pos),
do: item
end
defp get_stack(module) do
get_attribute(module, @stack)
end
defp update_stack(module, fun) do
update_attribute(module, @stack, fun)
end
defp get_pipes(module) do
get_attribute(module, @pipes)
end
defp update_pipes(module, fun) do
update_attribute(module, @pipes, fun)
end
defp get_attribute(module, attr) do
Module.get_attribute(module, attr) ||
raise "Phoenix router scope was not initialized"
end
defp update_attribute(module, attr, fun) do
Module.put_attribute(module, attr, fun.(get_attribute(module, attr)))
end
end