From 20f76a256e35ee4bcf9c6ed75693680ddfe58a72 Mon Sep 17 00:00:00 2001
From: Thomas De Keulenaer <thomas.dekeulenaer@gmail.com>
Date: Thu, 6 Jul 2017 09:24:01 +0200
Subject: [PATCH] Push resources for indexFiles when surfing to directories

Use httpserver.IndexFile() to determine index files

Test if middleware pushes indexfile when requesting directory

Fix codereview issues

Serve original request first, push later

Revert "Serve original request first, push later"

This reverts commit 2c66f01115747e5665ba7f2d33e2fd551dc31877.
---
 caddyhttp/push/handler.go      |  9 ++++-
 caddyhttp/push/handler_test.go | 60 ++++++++++++++++++++++++++++++++++
 caddyhttp/push/push.go         |  1 +
 caddyhttp/push/setup.go        |  5 +--
 4 files changed, 72 insertions(+), 3 deletions(-)

diff --git a/caddyhttp/push/handler.go b/caddyhttp/push/handler.go
index a651338e..fcc6ab0b 100644
--- a/caddyhttp/push/handler.go
+++ b/caddyhttp/push/handler.go
@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/mholt/caddy/caddyhttp/httpserver"
+	"github.com/mholt/caddy/caddyhttp/staticfiles"
 )
 
 func (h Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
@@ -25,7 +26,13 @@ func (h Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, erro
 	// push first
 outer:
 	for _, rule := range h.Rules {
-		if httpserver.Path(r.URL.Path).Matches(rule.Path) {
+		urlPath := r.URL.Path
+		matches := httpserver.Path(urlPath).Matches(rule.Path)
+		// Also check IndexPages when requesting a directory
+		if !matches {
+			_, matches = httpserver.IndexFile(h.Root, urlPath, staticfiles.IndexPages)
+		}
+		if matches {
 			for _, resource := range rule.Resources {
 				pushErr := pusher.Push(resource.Path, &http.PushOptions{
 					Method: resource.Method,
diff --git a/caddyhttp/push/handler_test.go b/caddyhttp/push/handler_test.go
index 343ab746..40903b6f 100644
--- a/caddyhttp/push/handler_test.go
+++ b/caddyhttp/push/handler_test.go
@@ -2,8 +2,11 @@ package push
 
 import (
 	"errors"
+	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
+	"os"
+	"path/filepath"
 	"reflect"
 	"testing"
 
@@ -307,6 +310,63 @@ func TestMiddlewareShouldInterceptLinkHeaderPusherError(t *testing.T) {
 	comparePushedResources(t, expectedPushedResources, pushingWriter.pushed)
 }
 
+func TestMiddlewareShouldPushIndexFile(t *testing.T) {
+	// given
+	indexFile := "/index.html"
+	request, err := http.NewRequest(http.MethodGet, "/", nil) // Request root directory, not indexfile itself
+	if err != nil {
+		t.Fatalf("Could not create HTTP request: %v", err)
+	}
+
+	root, err := ioutil.TempDir("", "caddy")
+	if err != nil {
+		t.Fatalf("Could not create temporary directory: %v", err)
+	}
+	defer os.Remove(root)
+
+	middleware := Middleware{
+		Next: httpserver.HandlerFunc(func(w http.ResponseWriter, r *http.Request) (int, error) {
+			return 0, nil
+		}),
+		Rules: []Rule{
+			{Path: indexFile, Resources: []Resource{
+				{Path: "/index.css", Method: http.MethodGet},
+			}},
+		},
+		Root: http.Dir(root),
+	}
+
+	indexFilePath := filepath.Join(root, indexFile)
+	_, err = os.Create(indexFilePath)
+	if err != nil {
+		t.Fatalf("Could not create index file: %s: %v", indexFile, err)
+	}
+	defer os.Remove(indexFilePath)
+
+	pushingWriter := &MockedPusher{
+		ResponseWriter: httptest.NewRecorder(),
+		returnedError:  errors.New("Cannot push right now"),
+	}
+
+	// when
+	_, err2 := middleware.ServeHTTP(pushingWriter, request)
+
+	// then
+	if err2 != nil {
+		t.Error("Should not return error")
+	}
+
+	expectedPushedResources := map[string]*http.PushOptions{
+		"/index.css": {
+			Method: http.MethodGet,
+			Header: http.Header{},
+		},
+	}
+
+	comparePushedResources(t, expectedPushedResources, pushingWriter.pushed)
+
+}
+
 func comparePushedResources(t *testing.T, expected, actual map[string]*http.PushOptions) {
 	if len(expected) != len(actual) {
 		t.Errorf("Expected %d pushed resources, actual: %d", len(expected), len(actual))
diff --git a/caddyhttp/push/push.go b/caddyhttp/push/push.go
index b2063bd7..2c5821a5 100644
--- a/caddyhttp/push/push.go
+++ b/caddyhttp/push/push.go
@@ -24,6 +24,7 @@ type (
 	Middleware struct {
 		Next  httpserver.Handler
 		Rules []Rule
+		Root  http.FileSystem
 	}
 
 	ruleOp func([]Resource)
diff --git a/caddyhttp/push/setup.go b/caddyhttp/push/setup.go
index b6c33176..28e8dbc5 100644
--- a/caddyhttp/push/setup.go
+++ b/caddyhttp/push/setup.go
@@ -34,8 +34,9 @@ func setup(c *caddy.Controller) error {
 		return err
 	}
 
-	httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
-		return Middleware{Next: next, Rules: rules}
+	cfg := httpserver.GetConfig(c)
+	cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
+		return Middleware{Next: next, Rules: rules, Root: http.Dir(cfg.Root)}
 	})
 
 	return nil