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Merge pull request #9 from amezcua/develop
Added cache and http caching client.
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Original file line number | Diff line number | Diff line change |
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defmodule Jwt.Cache do | ||
@callback invalidate() :: {:ok} | {:error, any} | ||
@callback get(uri :: String.t) :: {:ok, struct} | {:error, any} | ||
@callback set(uri :: String.t, data :: struct) :: {:ok, struct} | {:error, any} | ||
end |
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defmodule Jwt.Cache.Ets do | ||
use GenServer | ||
@behaviour Jwt.Cache | ||
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require Logger | ||
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@cache_name EtsCache | ||
@cache_table_name :certstable | ||
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def start(_type, _args) do | ||
link = GenServer.start_link(__MODULE__, [], name: @cache_name) | ||
Logger.debug("Jwt.Cache.Ets Started: #{inspect link}") | ||
link | ||
end | ||
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def invalidate(), do: GenServer.call(@cache_name, :invalidate) | ||
def get(uri), do: GenServer.call(@cache_name, {:get, uri}) | ||
def set(uri, data), do: GenServer.call(@cache_name, {:set, uri, data}) | ||
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def init(_), do: {:ok, _invalidate()} | ||
def handle_call(:invalidate, _from, _), do: {:reply, _invalidate(), []} | ||
def handle_call({:get, uri}, _from, _), do: {:reply, _get(uri), uri} | ||
def handle_call({:set, uri, data}, _from, _), do: {:reply, _set(uri, data), uri} | ||
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defp _invalidate() do | ||
:ets.info(@cache_table_name) | ||
|> create_cache | ||
|> case do | ||
@cache_table_name -> {:ok, @cache_table_name} | ||
_ -> {:error, "Failed to invalidate the cache"} | ||
end | ||
end | ||
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defp create_cache(:undefined) do | ||
cache = :ets.new(@cache_table_name, [:named_table, :public]) | ||
Logger.debug("Jwt.Cache.Ets.create_cache: #{inspect cache}") | ||
cache | ||
end | ||
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defp create_cache(_) do | ||
:ets.delete(@cache_table_name) | ||
create_cache(:undefined) | ||
end | ||
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defp _get(uri) do | ||
value = :ets.lookup(@cache_table_name, uri) | ||
Logger.debug "#{inspect uri} -> #{inspect value}" | ||
case value do | ||
[] -> {:error, uri} | ||
_ -> {:ok, elem(Enum.at(value, 0), 1)} | ||
end | ||
end | ||
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defp _set(uri, data) do | ||
Logger.debug "#{inspect uri} saving to cache." | ||
:ets.insert(@cache_table_name, {uri, data}) | ||
|> case do | ||
true -> {:ok, data} | ||
false -> {:error, uri} | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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defmodule Jwt.HttpCacheClient do | ||
require Logger | ||
@expires_header "Expires" | ||
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def get!(uri, cache \\ Jwt.Cache.Ets, httpclient \\ HTTPoison) do | ||
{_result, value} = get(uri, cache, httpclient) | ||
value | ||
end | ||
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def get(uri, cache \\ Jwt.Cache.Ets, httpclient \\ HTTPoison) do | ||
cache.get(uri) | ||
|> case do | ||
{:ok, cachedvalue} -> | ||
case expired_entry?(cachedvalue) do | ||
true -> request_and_cache(uri, cache, httpclient) | ||
false -> {:ok, cachedvalue} | ||
end | ||
{:error, _} -> request_and_cache(uri, cache, httpclient) | ||
end | ||
end | ||
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defp expired_entry?(cachedvalue) do | ||
case Enum.find cachedvalue.headers, fn(header) -> elem(header, 0) == @expires_header end do | ||
{@expires_header, expiresvalue} -> expired_date?(expiresvalue) | ||
_ -> true | ||
end | ||
end | ||
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defp request_and_cache(uri, cache, httpclient) do | ||
Logger.debug "Requesting URL: #{inspect uri}..." | ||
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httpclient.get(uri) | ||
|> case do | ||
{:ok, response} -> cache_if_expires_header_present(uri, response, cache) | ||
{:error, _} -> {:error, uri} | ||
end | ||
end | ||
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defp cache_if_expires_header_present(uri, response, cache) do | ||
case Enum.any?(response.headers, fn header -> elem(header, 0) == @expires_header end) do | ||
true -> cache.set(uri, response) | ||
false -> {:ok, response} | ||
end | ||
end | ||
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defp expired_date?(date) do | ||
shifted_time = Timex.shift(Timex.parse!(date, "{RFC1123}"), minutes: -20) | ||
Timex.before? shifted_time, Timex.now | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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defmodule CachingHttpClientTest do | ||
use ExUnit.Case, async: true | ||
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require Logger | ||
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@validtesturl "https://accounts.google.com/.well-known/openid-configuration" | ||
@invalidtesturl "https://www.google.com" | ||
@testcache Jwt.Cache.Ets | ||
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setup do | ||
@testcache.invalidate() | ||
:ok | ||
end | ||
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test "Response not in cache is cached" do | ||
Application.put_env(:jwt, :httpclient, HTTPoison) | ||
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Jwt.HttpCacheClient.get(@validtesturl, @testcache) | ||
{result, value} = @testcache.get(@validtesturl) | ||
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assert result == :ok | ||
assert value != nil | ||
end | ||
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test "Invalid url is not cached" do | ||
invaliduri = "invalid" | ||
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Jwt.HttpCacheClient.get(invaliduri, @testcache) | ||
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assert {:error, invaliduri} == @testcache.get(invaliduri) | ||
end | ||
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test "Cached values are returned instead of hitting the network" do | ||
cachedresponse = cacheableresponse(Timex.shift(Timex.now, hours: 1)) | ||
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Logger.debug("Cached response is: #{inspect cachedresponse}") | ||
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@testcache.set(@validtesturl, cachedresponse) | ||
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{client_result, client_value} = Jwt.HttpCacheClient.get(@validtesturl, @testcache) | ||
{cached_result, cached_value} = @testcache.get(@validtesturl) | ||
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assert client_result == :ok | ||
assert client_value == cachedresponse | ||
assert cached_result == :ok | ||
assert cached_value == cachedresponse | ||
end | ||
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test "Do not cache responses that do not include the Expires header" do | ||
testurl = "http://fakeurl" | ||
testresponse = noncacheableresponse() | ||
Application.put_env(:jwt, :fake_response, {:ok, testresponse}) | ||
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{client_result, client_value} = Jwt.HttpCacheClient.get(testurl, @testcache, CachingHttpClientTest.FakeHttpClient) | ||
{cached_result, cached_value} = @testcache.get(testurl) | ||
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assert client_result == :ok | ||
assert client_value == testresponse | ||
assert cached_result == :error | ||
assert cached_value == testurl | ||
end | ||
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test "Cache response if expires header present" do | ||
testurl = "http://fakeurl" | ||
response = cacheableresponse() | ||
Application.put_env(:jwt, :fake_response, {:ok, response}) | ||
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Jwt.HttpCacheClient.get(testurl, @testcache, CachingHttpClientTest.FakeHttpClient) | ||
{result, value} = @testcache.get(testurl) | ||
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assert result == :ok | ||
assert value == response | ||
end | ||
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test "Expired responses are discarded and downloaded and cached" do | ||
testurl = "http://fakeurl" | ||
expiredresponse = cacheableresponse(Timex.shift(Timex.now, hours: -1)) | ||
currentresponse = cacheableresponse(Timex.now) | ||
Application.put_env(:jwt, :fake_response, {:ok, currentresponse}) | ||
@testcache.set(testurl, expiredresponse) | ||
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{client_result, client_value} = Jwt.HttpCacheClient.get(testurl, @testcache, CachingHttpClientTest.FakeHttpClient) | ||
{cache_result, cache_value} = @testcache.get(testurl) | ||
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assert client_result == :ok | ||
assert client_value == currentresponse | ||
assert cache_result == :ok | ||
assert cache_value == currentresponse | ||
end | ||
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defp noncacheableresponse() do | ||
%{body: "{\n \"issuer\": \"https://accounts.google.com\",\n \"authorization_endpoint\": \"https://accounts.google.com/o/oauth2/v2/auth\",\n \"token_endpoint\": \"https://www.googleapis.com/oauth2/v4/token\",\n \"userinfo_endpoint\": \"https://www.googleapis.com/oauth2/v3/userinfo\",\n \"revocation_endpoint\": \"https://accounts.google.com/o/oauth2/revoke\",\n \"jwks_uri\": \"https://www.googleapis.com/oauth2/v3/certs\",\n \"response_types_supported\": [\n \"code\",\n \"token\",\n \"id_token\",\n \"code token\",\n \"code id_token\",\n \"token id_token\",\n \"code token id_token\",\n \"none\"\n ],\n \"subject_types_supported\": [\n \"public\"\n ],\n \"id_token_signing_alg_values_supported\": [\n \"RS256\"\n ],\n \"scopes_supported\": [\n \"openid\",\n \"email\",\n \"profile\"\n ],\n \"token_endpoint_auth_methods_supported\": [\n \"client_secret_post\",\n \"client_secret_basic\"\n ],\n \"claims_supported\": [\n \"aud\",\n \"email\",\n \"email_verified\",\n \"exp\",\n \"family_name\",\n \"given_name\",\n \"iat\",\n \"iss\",\n \"locale\",\n \"name\",\n \"picture\",\n \"sub\"\n ],\n \"code_challenge_methods_supported\": [\n \"plain\",\n \"S256\"\n ]\n}\n", | ||
headers: [ | ||
{"Vary", "Accept-Encoding"}, | ||
{"Content-Type", "application/json"}], | ||
status_code: 200} | ||
end | ||
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defp cacheableresponse(expires_date \\ Timex.now) do | ||
%{body: "{\n \"issuer\": \"https://accounts.google.com\",\n \"authorization_endpoint\": \"https://accounts.google.com/o/oauth2/v2/auth\",\n \"token_endpoint\": \"https://www.googleapis.com/oauth2/v4/token\",\n \"userinfo_endpoint\": \"https://www.googleapis.com/oauth2/v3/userinfo\",\n \"revocation_endpoint\": \"https://accounts.google.com/o/oauth2/revoke\",\n \"jwks_uri\": \"https://www.googleapis.com/oauth2/v3/certs\",\n \"response_types_supported\": [\n \"code\",\n \"token\",\n \"id_token\",\n \"code token\",\n \"code id_token\",\n \"token id_token\",\n \"code token id_token\",\n \"none\"\n ],\n \"subject_types_supported\": [\n \"public\"\n ],\n \"id_token_signing_alg_values_supported\": [\n \"RS256\"\n ],\n \"scopes_supported\": [\n \"openid\",\n \"email\",\n \"profile\"\n ],\n \"token_endpoint_auth_methods_supported\": [\n \"client_secret_post\",\n \"client_secret_basic\"\n ],\n \"claims_supported\": [\n \"aud\",\n \"email\",\n \"email_verified\",\n \"exp\",\n \"family_name\",\n \"given_name\",\n \"iat\",\n \"iss\",\n \"locale\",\n \"name\",\n \"picture\",\n \"sub\"\n ],\n \"code_challenge_methods_supported\": [\n \"plain\",\n \"S256\"\n ]\n}\n", | ||
headers: [ | ||
{"Vary", "Accept-Encoding"}, | ||
{"Content-Type", "application/json"}, | ||
{"Expires", Timex.format!(expires_date, "{RFC1123}")}], | ||
status_code: 200} | ||
end | ||
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defmodule FakeHttpClient do | ||
def get(_uri), do: Application.get_env(:jwt, :fake_response) | ||
end | ||
end |