fix(proxy) iterator to act on consumer, not on credential (Kong#2424)

Credentials will not always be set, hence the iterator should base
itself on the consumer id set.

fixes Kong#2414

CHANGELOG.md

@@ -61,6 +61,9 @@
 - Prevent an upstream or legitimate internal error in the load balancing code
   from throwing a Lua-land error as well.
   [#2327](https://github.com/Mashape/kong/pull/2327)
+- Ensure consumer based plugins run if the consumer was set without a
+  credential.
+  [#2424](https://github.com/Mashape/kong/pull/2424)
 - Plugins:
   - hmac: Better handling of invalid base64-encoded signatures. Previously Kong
     would return an HTTP 500 error. We now properly return HTTP 403 Forbidden.

kong/core/plugins_iterator.lua

@@ -73,7 +73,7 @@ local function iter_plugins_for_req(loaded_plugins, access_or_cert_ctx)
         local plugin_configuration
 
         -- Search API and Consumer specific, or consumer specific
-        local consumer_id = (ctx.authenticated_credential or empty).consumer_id
+        local consumer_id = (ctx.authenticated_consumer or empty).id        
         if consumer_id and plugin.schema and not plugin.schema.no_consumer then
           plugin_configuration = load_plugin_configuration(ctx.api.id, consumer_id, plugin.name)
           if not plugin_configuration then

spec/02-integration/05-proxy/03-plugins_triggering_spec.lua

@@ -17,6 +17,9 @@ describe("Plugins triggering", function()
       key = "secret2",
       consumer_id = consumer2.id
     })
+    local consumer3 = assert(helpers.dao.consumers:insert {
+      username = "anonymous"
+    })
 
     -- Global configuration
     assert(helpers.dao.apis:insert {
@@ -73,6 +76,28 @@ describe("Plugins triggering", function()
       }
     })
 
+    -- API with anonymous configuration
+    local api3 = assert(helpers.dao.apis:insert {
+      name = "api3",
+      hosts = { "api3.com" },
+      upstream_url = "http://mockbin.com"
+    })
+    assert(helpers.dao.plugins:insert {
+      name = "key-auth",
+      config = {
+        anonymous = consumer3.id,
+      },
+      api_id = api3.id,
+    })
+    assert(helpers.dao.plugins:insert {
+      name = "rate-limiting",
+      consumer_id = consumer3.id,
+      api_id = api3.id,
+      config = {
+        hour = 5,
+      }
+    })
+
     assert(helpers.start_kong())
     client = helpers.proxy_client()
   end)
@@ -126,4 +151,13 @@ describe("Plugins triggering", function()
     assert.res_status(200, res)
     assert.equal("4", res.headers["x-ratelimit-limit-hour"])
   end)
+  it("checks anonymous consumer specific configuration", function()
+    local res = assert(client:send {
+      method = "GET",
+      path = "/status/200",
+      headers = { Host = "api3.com" }
+    })
+    assert.res_status(200, res)
+    assert.equal("5", res.headers["x-ratelimit-limit-hour"])
+  end)
 end)