net/instaweb/rewriter/file_load_policy_test.cc - incubator-pagespeed-mod - Git at Google

 /*
  * Copyright 2011 Google Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 // Author: sligocki@google.com (Shawn Ligocki)

 #include "net/instaweb/rewriter/public/file_load_policy.h"

 #include "pagespeed/kernel/base/gtest.h"
 #include "pagespeed/kernel/base/string.h"
 #include "pagespeed/kernel/base/string_util.h"
 #include "pagespeed/kernel/http/google_url.h"

 namespace net_instaweb {

 class FileLoadPolicyTest : public ::testing::Test {
  protected:
   // Generally use this for URLs you don't expect to be loaded from files.
   // e.g. EXPECT_FALSE(TryLoadFromFile("http://www.example.com/"));
   bool TryLoadFromFile(StringPiece url_string) const {
     return TryLoadFromFile(url_string, &policy_);
   }

   bool TryLoadFromFile(StringPiece url_string,
                        const FileLoadPolicy* policy) const {
     const GoogleUrl url(url_string);
     GoogleString filename;
     return policy->ShouldLoadFromFile(url, &filename);
   }

   // Generally use this for URLs you do expect to be loaded from files.
   // e.g. EXPECT_EQ("filename", LoadFromFile("url"));
   GoogleString LoadFromFile(StringPiece url_string) const {
     return LoadFromFile(url_string, &policy_);
   }

   GoogleString LoadFromFile(StringPiece url_string,
                             const FileLoadPolicy* policy) const {
     const GoogleUrl url(url_string);
     GoogleString filename;
     const bool load = policy->ShouldLoadFromFile(url, &filename);
     if (!load) {
       EXPECT_TRUE(filename.empty()) << url_string;
     }
     return filename;
   }

   FileLoadPolicy policy_;
 };

 TEST_F(FileLoadPolicyTest, EmptyPolicy) {
   GoogleString filename;

   // Empty policy. Don't map anything.
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
   EXPECT_FALSE(TryLoadFromFile(
       "http://www.example.com/static/some/more/dirs/b.css"));
   EXPECT_FALSE(TryLoadFromFile(
       "http://www.example.com/static/foo.png?version=3.1"));
   EXPECT_FALSE(TryLoadFromFile(
       "http://www.example.com/static/foo.png?a?b#/c?foo"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo%20bar.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/images/another.gif"));
   EXPECT_FALSE(TryLoadFromFile(
       "http://www.some-site.com/with/many/dirs/a/b.js"));

   EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
 }

 TEST_F(FileLoadPolicyTest, OnePrefix) {
   policy_.Associate("http://www.example.com/static/", "/example/1/");

   GoogleString filename;

   // Map URLs to files.
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
   EXPECT_EQ("/example/1/some/more/dirs/b.css",
             LoadFromFile("http://www.example.com/static/some/more/dirs/b.css"));
   // Drop query string.
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png?version=3.1"));
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png?a?b#/c?foo"));
   EXPECT_EQ("/example/1/foo bar.png",
             LoadFromFile("http://www.example.com/static/foo%20bar.png"));
   EXPECT_EQ("/example/1/foo%2Fbar.png",
             LoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

   // Don't map other URLs
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/images/another.gif"));
   EXPECT_FALSE(TryLoadFromFile(
       "http://www.some-site.com/with/many/dirs/a/b.js"));

   EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
 }

 TEST_F(FileLoadPolicyTest, ManyPrefixes) {
   policy_.Associate("http://www.example.com/static/", "/example/1/");
   // Note: File prefix doesn't end in '/'.
   policy_.Associate("http://www.example.com/images/", "/example/images/static");
   // Note: URL prefix doesn't end in '/'.
   policy_.Associate("http://www.some-site.com/with/many/dirs",
                     "/var/www/some-site.com/");

   GoogleString filename;

   // Map URLs to files.
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
   EXPECT_EQ("/example/1/some/more/dirs/b.css",
             LoadFromFile("http://www.example.com/static/some/more/dirs/b.css"));
   // Drop query string.
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png?version=3.1"));
   EXPECT_EQ("/example/1/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png?a?b#/c?foo"));
   EXPECT_EQ("/example/1/foo bar.png",
             LoadFromFile("http://www.example.com/static/foo%20bar.png"));
   EXPECT_EQ("/example/1/foo%2Fbar.png",
             LoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

   // Map other associations.
   EXPECT_EQ("/example/images/static/another.gif",
             LoadFromFile("http://www.example.com/images/another.gif"));
   EXPECT_EQ("/var/www/some-site.com/a/b.js",
             LoadFromFile("http://www.some-site.com/with/many/dirs/a/b.js"));

   // Don't map other URLs
   EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/%2E%2E/foo.png"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/%2e%2e/foo.png"));
 }

 TEST_F(FileLoadPolicyTest, RegexpBackreferences) {
   GoogleString error;
   policy_.AssociateRegexp("^https?://example.com/~([^/]*)/static/",
                           "/var/static/\\1/", &error);
   EXPECT_TRUE(error.empty());
   EXPECT_EQ("/var/static/pat/cat.jpg",
             LoadFromFile("http://example.com/~pat/static/cat.jpg"));
   EXPECT_EQ("/var/static/sam/dog.jpg",
             LoadFromFile("http://example.com/~sam/static/dog.jpg"));
   EXPECT_EQ("/var/static/al/ie.css",
             LoadFromFile("https://example.com/~al/static/ie.css"));
 }

 TEST_F(FileLoadPolicyTest, RegexpNotPrefix) {
   GoogleString error;
   EXPECT_FALSE(policy_.AssociateRegexp("http://example.com/[^/]*/static",
                                        "/var/static/", &error));
   EXPECT_FALSE(error.empty());
 }

 TEST_F(FileLoadPolicyTest, RegexpExcessBackreferences) {
   GoogleString error;
   EXPECT_FALSE(policy_.AssociateRegexp("^http://([^/]*).com/([^/]*)/static",
                                        "/var/\\1/\\2/\\3/static/", &error));
   EXPECT_FALSE(error.empty());
 }

 TEST_F(FileLoadPolicyTest, RegexpInvalid) {
   GoogleString error;
   EXPECT_FALSE(policy_.AssociateRegexp("^http://(.com/static",
                                        "/var/www/static/", &error));
   EXPECT_FALSE(error.empty());
 }

 // Note(sligocki): I'm not sure we should allow overlapping prefixes, but
 // here's what happens if you do that now. And I think it's the most reasonable
 // behavior if we do allow it.
 TEST_F(FileLoadPolicyTest, OverlappingPrefixes) {
   policy_.Associate("http://www.example.com/static/", "/1/");
   policy_.Associate("http://www.example.com/", "/2/");
   policy_.Associate("http://www.example.com/static/sub/dir/", "/3/");

   // Later associations take precedence over earlier ones.
   EXPECT_EQ("/2/foo.png",
             LoadFromFile("http://www.example.com/foo.png"));
   EXPECT_EQ("/2/static/foo.png",
             LoadFromFile("http://www.example.com/static/foo.png"));
   EXPECT_EQ("/3/foo.png",
             LoadFromFile("http://www.example.com/static/sub/dir/foo.png"));
   EXPECT_EQ("/3/plus/foo.png",
             LoadFromFile("http://www.example.com/static/sub/dir/plus/foo.png"));
 }

 TEST_F(FileLoadPolicyTest, Rules) {
   GoogleString error;
   policy_.Associate("http://example.com/", "/www/");
   EXPECT_FALSE(TryLoadFromFile("http://example.com/1"));
   EXPECT_EQ("/www/cgi-bin/guestbook.pl.js",
             LoadFromFile("http://example.com/cgi-bin/guestbook.pl.js"));
   policy_.AddRule("/www/cgi-bin/", false /* literal */, false /* disallow */,
                   &error);
   EXPECT_TRUE(error.empty());
   EXPECT_FALSE(TryLoadFromFile("http://example.com/cgi-bin/guestbook.pl.js"));
   policy_.AddRule("\\.js$", true /* regexp */, true /* allow */, &error);
   EXPECT_TRUE(error.empty());
   EXPECT_EQ("/www/cgi-bin/guestbook.js",
             LoadFromFile("http://example.com/cgi-bin/guestbook.js"));
   policy_.AddRule("\\.ssi.js$",
                   true /* regexp */, false /* disallow */, &error);
   EXPECT_TRUE(error.empty());
   EXPECT_FALSE(
       TryLoadFromFile("http://example.com/cgi-bin/guestbook.ssi.js"));
   policy_.AddRule("/www/cgi-bin/allow", false /* literal */, true /* allow */,
                   &error);
   EXPECT_TRUE(error.empty());
   EXPECT_EQ("/www/cgi-bin/allow.ssi.js",
             LoadFromFile("http://example.com/cgi-bin/allow.ssi.js"));
 }

 TEST_F(FileLoadPolicyTest, Merge) {
   FileLoadPolicy policy1;
   FileLoadPolicy policy2;
   GoogleString error;

   policy1.Associate("http://www.example.com/1/", "/1/");
   EXPECT_EQ("/1/foo.png",
             LoadFromFile("http://www.example.com/1/foo.png", &policy1));
   EXPECT_TRUE(
       policy1.AssociateRegexp("^http://www\\.example\\.com/([^/]*)/",
                               "/\\1/a/", &error));
   EXPECT_TRUE(error.empty());
   // The regexp match is added later so takes precendence over the literal one.

   EXPECT_TRUE(policy1.AddRule("/5/", false /* literal */,
                               false /* disallow */, &error));
   EXPECT_TRUE(error.empty());
   EXPECT_TRUE(policy1.AddRule("\\.jpg$", true /* regexp */,
                               false /* disallow */, &error));
   EXPECT_TRUE(error.empty());

   EXPECT_EQ("/1/a/foo.png",
             LoadFromFile("http://www.example.com/1/foo.png", &policy1));
   EXPECT_EQ("/2/a/foo.png",
             LoadFromFile("http://www.example.com/2/foo.png", &policy1));
   EXPECT_EQ("/3/a/foo.png",
             LoadFromFile("http://www.example.com/3/foo.png", &policy1));

   // The next two are blacklisted.
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/3/foo.jpg", &policy1));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/5/foo.png", &policy1));

   policy2.Associate("http://www.example.com/3/", "/3/");
   policy2.Associate("http://www.example.com/4/", "/4/");
   EXPECT_TRUE(policy2.AddRule("exception\\.jpg$", true /* regexp */,
                               true /* allow */, &error));
   EXPECT_TRUE(error.empty());

   EXPECT_EQ("/3/foo.png",
             LoadFromFile("http://www.example.com/3/foo.png", &policy2));
   EXPECT_EQ("/4/foo.png",
             LoadFromFile("http://www.example.com/4/foo.png", &policy2));
   EXPECT_EQ("/4/foo.jpg",
             LoadFromFile("http://www.example.com/4/foo.jpg", &policy2));
   policy1.Merge(policy2);

   EXPECT_EQ("/1/a/foo.png",
             LoadFromFile("http://www.example.com/1/foo.png", &policy1));
   EXPECT_EQ("/2/a/foo.png",
             LoadFromFile("http://www.example.com/2/foo.png", &policy1));

   // Later policies take precendence, so policy2 wins for /3/.
   EXPECT_EQ("/3/foo.png",
             LoadFromFile("http://www.example.com/3/foo.png", &policy1));
   EXPECT_EQ("/4/foo.png",
             LoadFromFile("http://www.example.com/4/foo.png", &policy1));

   // Check rules.
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/5/foo.png", &policy1));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/4/foo.jpg", &policy1));
   EXPECT_FALSE(
       TryLoadFromFile("http://www.example.com/4/foo.notjpg", &policy1));
   EXPECT_EQ("/4/exception.jpg",
             LoadFromFile("http://www.example.com/4/exception.jpg", &policy1));
   EXPECT_EQ("/4/anexception.jpg",
             LoadFromFile("http://www.example.com/4/anexception.jpg", &policy1));
   EXPECT_EQ("/5/a/exception.jpg",
             LoadFromFile("http://www.example.com/5/exception.jpg", &policy1));

   // No changes to policy2.
   EXPECT_EQ("/3/foo.png",
             LoadFromFile("http://www.example.com/3/foo.png", &policy2));
   EXPECT_EQ("/4/foo.png",
             LoadFromFile("http://www.example.com/4/foo.png", &policy2));
 }

 TEST_F(FileLoadPolicyTest, OnlyStatic) {
   policy_.Associate("http://www.example.com/", "/");

   // Verify that only static resources are loaded from file.
   EXPECT_EQ("/a.jpg", LoadFromFile("http://www.example.com/a.jpg"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.unknown"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.png/"));
   EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.png/b"));
 }

 }  // namespace net_instaweb
	/*
	* Copyright 2011 Google Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	// Author: sligocki@google.com (Shawn Ligocki)

	#include "net/instaweb/rewriter/public/file_load_policy.h"

	#include "pagespeed/kernel/base/gtest.h"
	#include "pagespeed/kernel/base/string.h"
	#include "pagespeed/kernel/base/string_util.h"
	#include "pagespeed/kernel/http/google_url.h"

	namespace net_instaweb {

	class FileLoadPolicyTest : public ::testing::Test {
	protected:
	// Generally use this for URLs you don't expect to be loaded from files.
	// e.g. EXPECT_FALSE(TryLoadFromFile("http://www.example.com/"));
	bool TryLoadFromFile(StringPiece url_string) const {
	return TryLoadFromFile(url_string, &policy_);
	}

	bool TryLoadFromFile(StringPiece url_string,
	const FileLoadPolicy* policy) const {
	const GoogleUrl url(url_string);
	GoogleString filename;
	return policy->ShouldLoadFromFile(url, &filename);
	}

	// Generally use this for URLs you do expect to be loaded from files.
	// e.g. EXPECT_EQ("filename", LoadFromFile("url"));
	GoogleString LoadFromFile(StringPiece url_string) const {
	return LoadFromFile(url_string, &policy_);
	}

	GoogleString LoadFromFile(StringPiece url_string,
	const FileLoadPolicy* policy) const {
	const GoogleUrl url(url_string);
	GoogleString filename;
	const bool load = policy->ShouldLoadFromFile(url, &filename);
	if (!load) {
	EXPECT_TRUE(filename.empty()) << url_string;
	}
	return filename;
	}

	FileLoadPolicy policy_;
	};

	TEST_F(FileLoadPolicyTest, EmptyPolicy) {
	GoogleString filename;

	// Empty policy. Don't map anything.
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
	EXPECT_FALSE(TryLoadFromFile(
	"http://www.example.com/static/some/more/dirs/b.css"));
	EXPECT_FALSE(TryLoadFromFile(
	"http://www.example.com/static/foo.png?version=3.1"));
	EXPECT_FALSE(TryLoadFromFile(
	"http://www.example.com/static/foo.png?a?b#/c?foo"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo%20bar.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/images/another.gif"));
	EXPECT_FALSE(TryLoadFromFile(
	"http://www.some-site.com/with/many/dirs/a/b.js"));

	EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
	}

	TEST_F(FileLoadPolicyTest, OnePrefix) {
	policy_.Associate("http://www.example.com/static/", "/example/1/");

	GoogleString filename;

	// Map URLs to files.
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
	EXPECT_EQ("/example/1/some/more/dirs/b.css",
	LoadFromFile("http://www.example.com/static/some/more/dirs/b.css"));
	// Drop query string.
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png?version=3.1"));
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png?a?b#/c?foo"));
	EXPECT_EQ("/example/1/foo bar.png",
	LoadFromFile("http://www.example.com/static/foo%20bar.png"));
	EXPECT_EQ("/example/1/foo%2Fbar.png",
	LoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

	// Don't map other URLs
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/images/another.gif"));
	EXPECT_FALSE(TryLoadFromFile(
	"http://www.some-site.com/with/many/dirs/a/b.js"));

	EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
	}

	TEST_F(FileLoadPolicyTest, ManyPrefixes) {
	policy_.Associate("http://www.example.com/static/", "/example/1/");
	// Note: File prefix doesn't end in '/'.
	policy_.Associate("http://www.example.com/images/", "/example/images/static");
	// Note: URL prefix doesn't end in '/'.
	policy_.Associate("http://www.some-site.com/with/many/dirs",
	"/var/www/some-site.com/");

	GoogleString filename;

	// Map URLs to files.
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/bar/"));
	EXPECT_EQ("/example/1/some/more/dirs/b.css",
	LoadFromFile("http://www.example.com/static/some/more/dirs/b.css"));
	// Drop query string.
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png?version=3.1"));
	EXPECT_EQ("/example/1/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png?a?b#/c?foo"));
	EXPECT_EQ("/example/1/foo bar.png",
	LoadFromFile("http://www.example.com/static/foo%20bar.png"));
	EXPECT_EQ("/example/1/foo%2Fbar.png",
	LoadFromFile("http://www.example.com/static/foo%2Fbar.png"));

	// Map other associations.
	EXPECT_EQ("/example/images/static/another.gif",
	LoadFromFile("http://www.example.com/images/another.gif"));
	EXPECT_EQ("/var/www/some-site.com/a/b.js",
	LoadFromFile("http://www.some-site.com/with/many/dirs/a/b.js"));

	// Don't map other URLs
	EXPECT_FALSE(TryLoadFromFile("http://www.other-site.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/../foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/%2E%2E/foo.png"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/static/%2e%2e/foo.png"));
	}

	TEST_F(FileLoadPolicyTest, RegexpBackreferences) {
	GoogleString error;
	policy_.AssociateRegexp("^https?://example.com/~([^/]*)/static/",
	"/var/static/\\1/", &error);
	EXPECT_TRUE(error.empty());
	EXPECT_EQ("/var/static/pat/cat.jpg",
	LoadFromFile("http://example.com/~pat/static/cat.jpg"));
	EXPECT_EQ("/var/static/sam/dog.jpg",
	LoadFromFile("http://example.com/~sam/static/dog.jpg"));
	EXPECT_EQ("/var/static/al/ie.css",
	LoadFromFile("https://example.com/~al/static/ie.css"));
	}

	TEST_F(FileLoadPolicyTest, RegexpNotPrefix) {
	GoogleString error;
	EXPECT_FALSE(policy_.AssociateRegexp("http://example.com/[^/]*/static",
	"/var/static/", &error));
	EXPECT_FALSE(error.empty());
	}

	TEST_F(FileLoadPolicyTest, RegexpExcessBackreferences) {
	GoogleString error;
	EXPECT_FALSE(policy_.AssociateRegexp("^http://([^/]).com/([^/])/static",
	"/var/\\1/\\2/\\3/static/", &error));
	EXPECT_FALSE(error.empty());
	}

	TEST_F(FileLoadPolicyTest, RegexpInvalid) {
	GoogleString error;
	EXPECT_FALSE(policy_.AssociateRegexp("^http://(.com/static",
	"/var/www/static/", &error));
	EXPECT_FALSE(error.empty());
	}

	// Note(sligocki): I'm not sure we should allow overlapping prefixes, but
	// here's what happens if you do that now. And I think it's the most reasonable
	// behavior if we do allow it.
	TEST_F(FileLoadPolicyTest, OverlappingPrefixes) {
	policy_.Associate("http://www.example.com/static/", "/1/");
	policy_.Associate("http://www.example.com/", "/2/");
	policy_.Associate("http://www.example.com/static/sub/dir/", "/3/");

	// Later associations take precedence over earlier ones.
	EXPECT_EQ("/2/foo.png",
	LoadFromFile("http://www.example.com/foo.png"));
	EXPECT_EQ("/2/static/foo.png",
	LoadFromFile("http://www.example.com/static/foo.png"));
	EXPECT_EQ("/3/foo.png",
	LoadFromFile("http://www.example.com/static/sub/dir/foo.png"));
	EXPECT_EQ("/3/plus/foo.png",
	LoadFromFile("http://www.example.com/static/sub/dir/plus/foo.png"));
	}

	TEST_F(FileLoadPolicyTest, Rules) {
	GoogleString error;
	policy_.Associate("http://example.com/", "/www/");
	EXPECT_FALSE(TryLoadFromFile("http://example.com/1"));
	EXPECT_EQ("/www/cgi-bin/guestbook.pl.js",
	LoadFromFile("http://example.com/cgi-bin/guestbook.pl.js"));
	policy_.AddRule("/www/cgi-bin/", false /* literal /, false / disallow */,
	&error);
	EXPECT_TRUE(error.empty());
	EXPECT_FALSE(TryLoadFromFile("http://example.com/cgi-bin/guestbook.pl.js"));
	policy_.AddRule("\\.js$", true /* regexp /, true / allow */, &error);
	EXPECT_TRUE(error.empty());
	EXPECT_EQ("/www/cgi-bin/guestbook.js",
	LoadFromFile("http://example.com/cgi-bin/guestbook.js"));
	policy_.AddRule("\\.ssi.js$",
	true /* regexp /, false / disallow */, &error);
	EXPECT_TRUE(error.empty());
	EXPECT_FALSE(
	TryLoadFromFile("http://example.com/cgi-bin/guestbook.ssi.js"));
	policy_.AddRule("/www/cgi-bin/allow", false /* literal /, true / allow */,
	&error);
	EXPECT_TRUE(error.empty());
	EXPECT_EQ("/www/cgi-bin/allow.ssi.js",
	LoadFromFile("http://example.com/cgi-bin/allow.ssi.js"));
	}

	TEST_F(FileLoadPolicyTest, Merge) {
	FileLoadPolicy policy1;
	FileLoadPolicy policy2;
	GoogleString error;

	policy1.Associate("http://www.example.com/1/", "/1/");
	EXPECT_EQ("/1/foo.png",
	LoadFromFile("http://www.example.com/1/foo.png", &policy1));
	EXPECT_TRUE(
	policy1.AssociateRegexp("^http://www\\.example\\.com/([^/]*)/",
	"/\\1/a/", &error));
	EXPECT_TRUE(error.empty());
	// The regexp match is added later so takes precendence over the literal one.

	EXPECT_TRUE(policy1.AddRule("/5/", false /* literal */,
	false /* disallow */, &error));
	EXPECT_TRUE(error.empty());
	EXPECT_TRUE(policy1.AddRule("\\.jpg$", true /* regexp */,
	false /* disallow */, &error));
	EXPECT_TRUE(error.empty());

	EXPECT_EQ("/1/a/foo.png",
	LoadFromFile("http://www.example.com/1/foo.png", &policy1));
	EXPECT_EQ("/2/a/foo.png",
	LoadFromFile("http://www.example.com/2/foo.png", &policy1));
	EXPECT_EQ("/3/a/foo.png",
	LoadFromFile("http://www.example.com/3/foo.png", &policy1));

	// The next two are blacklisted.
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/3/foo.jpg", &policy1));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/5/foo.png", &policy1));

	policy2.Associate("http://www.example.com/3/", "/3/");
	policy2.Associate("http://www.example.com/4/", "/4/");
	EXPECT_TRUE(policy2.AddRule("exception\\.jpg$", true /* regexp */,
	true /* allow */, &error));
	EXPECT_TRUE(error.empty());

	EXPECT_EQ("/3/foo.png",
	LoadFromFile("http://www.example.com/3/foo.png", &policy2));
	EXPECT_EQ("/4/foo.png",
	LoadFromFile("http://www.example.com/4/foo.png", &policy2));
	EXPECT_EQ("/4/foo.jpg",
	LoadFromFile("http://www.example.com/4/foo.jpg", &policy2));
	policy1.Merge(policy2);

	EXPECT_EQ("/1/a/foo.png",
	LoadFromFile("http://www.example.com/1/foo.png", &policy1));
	EXPECT_EQ("/2/a/foo.png",
	LoadFromFile("http://www.example.com/2/foo.png", &policy1));

	// Later policies take precendence, so policy2 wins for /3/.
	EXPECT_EQ("/3/foo.png",
	LoadFromFile("http://www.example.com/3/foo.png", &policy1));
	EXPECT_EQ("/4/foo.png",
	LoadFromFile("http://www.example.com/4/foo.png", &policy1));

	// Check rules.
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/5/foo.png", &policy1));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/4/foo.jpg", &policy1));
	EXPECT_FALSE(
	TryLoadFromFile("http://www.example.com/4/foo.notjpg", &policy1));
	EXPECT_EQ("/4/exception.jpg",
	LoadFromFile("http://www.example.com/4/exception.jpg", &policy1));
	EXPECT_EQ("/4/anexception.jpg",
	LoadFromFile("http://www.example.com/4/anexception.jpg", &policy1));
	EXPECT_EQ("/5/a/exception.jpg",
	LoadFromFile("http://www.example.com/5/exception.jpg", &policy1));

	// No changes to policy2.
	EXPECT_EQ("/3/foo.png",
	LoadFromFile("http://www.example.com/3/foo.png", &policy2));
	EXPECT_EQ("/4/foo.png",
	LoadFromFile("http://www.example.com/4/foo.png", &policy2));
	}

	TEST_F(FileLoadPolicyTest, OnlyStatic) {
	policy_.Associate("http://www.example.com/", "/");

	// Verify that only static resources are loaded from file.
	EXPECT_EQ("/a.jpg", LoadFromFile("http://www.example.com/a.jpg"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.unknown"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.png/"));
	EXPECT_FALSE(TryLoadFromFile("http://www.example.com/a.png/b"));
	}

	} // namespace net_instaweb