Add pantheon_advanced_page_cache module

composer.json

@@ -147,6 +147,7 @@
         "drupal/migrate_plus": "4.0",
         "drupal/migrate_tools": "4.0",
         "drupal/module_filter": "^3.1",
+        "drupal/pantheon_advanced_page_cache": "^1.0",
         "drupal/paragraphs": "1.6",
         "drupal/pathauto": "1.0",
         "drupal/realname": "^1.0@RC",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "47248f33666390611f53aeadf8f0ecef",
+    "content-hash": "110261189e3075f3fce4ac0d870a2085",
     "packages": [
         {
             "name": "alchemy/zippy",
@@ -3753,7 +3753,8 @@
                     }
                 },
                 "patches_applied": {
-                    "2881745": "patches/entity_embed_2881745-22.patch"
+                    "2881745": "patches/entity_embed_2881745-22.patch",
+                    "2511404": "https://www.drupal.org/files/issues/2018-09-17/entity-embed-link-2511404-68.patch"
                 }
             },
             "notification-url": "https://packages.drupal.org/8/downloads",
@@ -5195,7 +5196,8 @@
             "homepage": "https://www.drupal.org/project/migrate_devel",
             "support": {
                 "source": "http://cgit.drupalcode.org/migrate_devel"
-            }
+            },
+            "time": "2017-06-25T23:46:13+00:00"
         },
         {
             "name": "drupal/migrate_plus",
@@ -5381,6 +5383,90 @@
                 "source": "http://cgit.drupalcode.org/module_filter"
             }
         },
+        {
+            "name": "drupal/pantheon_advanced_page_cache",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://git.drupalcode.org/project/pantheon_advanced_page_cache.git",
+                "reference": "8.x-1.0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://ftp.drupal.org/files/projects/pantheon_advanced_page_cache-8.x-1.0.zip",
+                "reference": "8.x-1.0",
+                "shasum": "c398e19dd098d0536bd49f0dfd0037674854a2e6"
+            },
+            "require": {
+                "drupal/core": "~8.0"
+            },
+            "require-dev": {
+                "drupal/coder": "^8.2",
+                "drupal/drupal-extension": "^3.3",
+                "phpunit/phpunit": "^6.3"
+            },
+            "type": "drupal-module",
+            "extra": {
+                "branch-alias": {
+                    "dev-1.x": "1.x-dev"
+                },
+                "drupal": {
+                    "version": "8.x-1.0",
+                    "datestamp": "1529441320",
+                    "security-coverage": {
+                        "status": "covered",
+                        "message": "Covered by Drupal's security advisory policy"
+                    }
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PantheonSystems\\CDNBehatHelpers\\": "tests/behat/helper_classes/"
+                }
+            },
+            "notification-url": "https://packages.drupal.org/8/downloads",
+            "scripts": {
+                "codesniff": [
+                    "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+                    "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+                    "phpcs  tests/behat  --standard=PSR2"
+                ],
+                "phpcbf": [
+                    "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+                    "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+                    "phpcbf  tests/behat  --standard=PSR2"
+                ],
+                "phpunit": [
+                    "phpunit tests --colors=always"
+                ]
+            },
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Ari Gold",
+                    "homepage": "https://www.drupal.org/user/329006"
+                },
+                {
+                    "name": "David Strauss",
+                    "homepage": "https://www.drupal.org/user/93254"
+                },
+                {
+                    "name": "Fabianx",
+                    "homepage": "https://www.drupal.org/user/693738"
+                },
+                {
+                    "name": "stevector",
+                    "homepage": "https://www.drupal.org/user/179805"
+                }
+            ],
+            "description": "Advanced page cache capabilities for Pantheon.",
+            "homepage": "https://www.drupal.org/project/pantheon_advanced_page_cache",
+            "support": {
+                "source": "https://git.drupalcode.org/project/pantheon_advanced_page_cache"
+            }
+        },
         {
             "name": "drupal/paragraphs",
             "version": "1.6.0",

vendor/composer/autoload_classmap.php

@@ -2796,6 +2796,9 @@
     'OomphInc\\ComposerInstallersExtender\\Installer' => $vendorDir . '/oomphinc/composer-installers-extender/src/Installer.php',
     'OomphInc\\ComposerInstallersExtender\\InstallerHelper' => $vendorDir . '/oomphinc/composer-installers-extender/src/InstallerHelper.php',
     'OomphInc\\ComposerInstallersExtender\\Plugin' => $vendorDir . '/oomphinc/composer-installers-extender/src/Plugin.php',
+    'PantheonSystems\\CDNBehatHelpers\\AgeTracker' => $baseDir . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/AgeTracker.php',
+    'PantheonSystems\\CDNBehatHelpers\\Contexts\\FeatureContext' => $baseDir . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/Contexts/FeatureContext.php',
+    'PantheonSystems\\CDNBehatHelpers\\tests\\AgeTrackerTest' => $baseDir . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/tests/AgeTrackerTest.php',
     'ParseError' => $vendorDir . '/symfony/polyfill-php70/Resources/stubs/ParseError.php',
     'PhpParser\\Builder' => $vendorDir . '/nikic/php-parser/lib/PhpParser/Builder.php',
     'PhpParser\\BuilderFactory' => $vendorDir . '/nikic/php-parser/lib/PhpParser/BuilderFactory.php',

vendor/composer/autoload_psr4.php

@@ -52,6 +52,7 @@
     'Psr\\Http\\Message\\' => array($vendorDir . '/psr/http-message/src'),
     'Psr\\Container\\' => array($vendorDir . '/psr/container/src'),
     'PhpParser\\' => array($vendorDir . '/nikic/php-parser/lib/PhpParser'),
+    'PantheonSystems\\CDNBehatHelpers\\' => array($baseDir . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes'),
     'OomphInc\\ComposerInstallersExtender\\' => array($vendorDir . '/oomphinc/composer-installers-extender/src'),
     'Masterminds\\' => array($vendorDir . '/masterminds/html5/src'),
     'JaimePerez\\TwigConfigurableI18n\\' => array($vendorDir . '/jaimeperez/twig-configurable-i18n/src'),

vendor/composer/autoload_static.php

@@ -104,6 +104,7 @@ class ComposerStaticInit5c689ffcd54b9e495ed983fdce09b530
             'Psr\\Http\\Message\\' => 17,
             'Psr\\Container\\' => 14,
             'PhpParser\\' => 10,
+            'PantheonSystems\\CDNBehatHelpers\\' => 32,
         ),
         'O' => 
         array (
@@ -345,6 +346,10 @@ class ComposerStaticInit5c689ffcd54b9e495ed983fdce09b530
         array (
             0 => __DIR__ . '/..' . '/nikic/php-parser/lib/PhpParser',
         ),
+        'PantheonSystems\\CDNBehatHelpers\\' => 
+        array (
+            0 => __DIR__ . '/../..' . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes',
+        ),
         'OomphInc\\ComposerInstallersExtender\\' => 
         array (
             0 => __DIR__ . '/..' . '/oomphinc/composer-installers-extender/src',
@@ -3335,6 +3340,9 @@ class ComposerStaticInit5c689ffcd54b9e495ed983fdce09b530
         'OomphInc\\ComposerInstallersExtender\\Installer' => __DIR__ . '/..' . '/oomphinc/composer-installers-extender/src/Installer.php',
         'OomphInc\\ComposerInstallersExtender\\InstallerHelper' => __DIR__ . '/..' . '/oomphinc/composer-installers-extender/src/InstallerHelper.php',
         'OomphInc\\ComposerInstallersExtender\\Plugin' => __DIR__ . '/..' . '/oomphinc/composer-installers-extender/src/Plugin.php',
+        'PantheonSystems\\CDNBehatHelpers\\AgeTracker' => __DIR__ . '/../..' . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/AgeTracker.php',
+        'PantheonSystems\\CDNBehatHelpers\\Contexts\\FeatureContext' => __DIR__ . '/../..' . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/Contexts/FeatureContext.php',
+        'PantheonSystems\\CDNBehatHelpers\\tests\\AgeTrackerTest' => __DIR__ . '/../..' . '/web/modules/pantheon_advanced_page_cache/tests/behat/helper_classes/tests/AgeTrackerTest.php',
         'ParseError' => __DIR__ . '/..' . '/symfony/polyfill-php70/Resources/stubs/ParseError.php',
         'PhpParser\\Builder' => __DIR__ . '/..' . '/nikic/php-parser/lib/PhpParser/Builder.php',
         'PhpParser\\BuilderFactory' => __DIR__ . '/..' . '/nikic/php-parser/lib/PhpParser/BuilderFactory.php',

vendor/composer/installed.json

@@ -5553,6 +5553,92 @@
             "source": "http://cgit.drupalcode.org/module_filter"
         }
     },
+    {
+        "name": "drupal/pantheon_advanced_page_cache",
+        "version": "1.0.0",
+        "version_normalized": "1.0.0.0",
+        "source": {
+            "type": "git",
+            "url": "https://git.drupalcode.org/project/pantheon_advanced_page_cache.git",
+            "reference": "8.x-1.0"
+        },
+        "dist": {
+            "type": "zip",
+            "url": "https://ftp.drupal.org/files/projects/pantheon_advanced_page_cache-8.x-1.0.zip",
+            "reference": "8.x-1.0",
+            "shasum": "c398e19dd098d0536bd49f0dfd0037674854a2e6"
+        },
+        "require": {
+            "drupal/core": "~8.0"
+        },
+        "require-dev": {
+            "drupal/coder": "^8.2",
+            "drupal/drupal-extension": "^3.3",
+            "phpunit/phpunit": "^6.3"
+        },
+        "type": "drupal-module",
+        "extra": {
+            "branch-alias": {
+                "dev-1.x": "1.x-dev"
+            },
+            "drupal": {
+                "version": "8.x-1.0",
+                "datestamp": "1529441320",
+                "security-coverage": {
+                    "status": "covered",
+                    "message": "Covered by Drupal's security advisory policy"
+                }
+            }
+        },
+        "installation-source": "dist",
+        "autoload": {
+            "psr-4": {
+                "PantheonSystems\\CDNBehatHelpers\\": "tests/behat/helper_classes/"
+            }
+        },
+        "notification-url": "https://packages.drupal.org/8/downloads",
+        "scripts": {
+            "codesniff": [
+                "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+                "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+                "phpcs  tests/behat  --standard=PSR2"
+            ],
+            "phpcbf": [
+                "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+                "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+                "phpcbf  tests/behat  --standard=PSR2"
+            ],
+            "phpunit": [
+                "phpunit tests --colors=always"
+            ]
+        },
+        "license": [
+            "GPL-2.0-or-later"
+        ],
+        "authors": [
+            {
+                "name": "Ari Gold",
+                "homepage": "https://www.drupal.org/user/329006"
+            },
+            {
+                "name": "David Strauss",
+                "homepage": "https://www.drupal.org/user/93254"
+            },
+            {
+                "name": "Fabianx",
+                "homepage": "https://www.drupal.org/user/693738"
+            },
+            {
+                "name": "stevector",
+                "homepage": "https://www.drupal.org/user/179805"
+            }
+        ],
+        "description": "Advanced page cache capabilities for Pantheon.",
+        "homepage": "https://www.drupal.org/project/pantheon_advanced_page_cache",
+        "support": {
+            "source": "https://git.drupalcode.org/project/pantheon_advanced_page_cache"
+        }
+    },
     {
         "name": "drupal/paragraphs",
         "version": "1.6.0",

web/modules/pantheon_advanced_page_cache/.circleci/config.yml

+version: 2
+# https://circleci.com/docs/configuration#machine
+jobs:
+    # @todo, separate build and test phases.
+    build:
+        docker:
+            - image: quay.io/pantheon-public/build-tools-ci:1.x
+        working_directory: ~/pantheon_advanced_page_cache
+        environment:
+            BASH_ENV: ~/.bashrc
+            TZ: "/usr/share/zoneinfo/America/Los_Angeles"
+            TERMINUS_SITE: d8papc
+        steps:
+            - checkout
+            - restore_cache:
+                key: dependency-cache-{{ checksum "composer.lock" }}
+            - run:
+                name: Composer install
+                command: |
+                  composer install
+                  drush help
+            - save_cache:
+                key: dependency-cache-{{ checksum "composer.lock" }}
+                paths:
+                  - ~/.composer/cache
+            - run:
+                name: PHP Code Sniff
+                command: composer codesniff
+            - run:
+                name: Unit Tests for Behat helper
+                command: composer phpunit
+            - run:
+                name: login-pantheon
+                command: |
+                  terminus auth:login -n --machine-token="$TERMINUS_TOKEN"
+                  terminus env:list --field=id $TERMINUS_SITE | grep -v '[a-z]' | grep -Eo '[0-9]{1,9}' | sort --numeric-sort --reverse | sed 1,7d | xargs -n1 -I ENV terminus env:delete --yes $TERMINUS_SITE.ENV
+            - run:
+                name: make-multidev
+                command: |
+                  touch $HOME/.ssh/config
+                  echo "StrictHostKeyChecking no" >> "$HOME/.ssh/config"
+                  terminus env:create $TERMINUS_SITE.dev ${CIRCLE_BUILD_NUM}
+                  terminus connection:set ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} sftp
+                  terminus drush ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- site-install -y
+                  terminus drush ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- cset system.performance cache.page.max_age 600 -y
+            - run:
+                name: Composer require
+                command: |
+                  terminus composer ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- config repositories.papc vcs git@github.com:pantheon-systems/pantheon_advanced_page_cache.git
+                  terminus composer ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- require drupal/pantheon_advanced_page_cache:dev-8.x-1.x#$CIRCLE_SHA1
+                  terminus composer ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- require drush-ops/behat-drush-endpoint
+                  # drush dl is faster than composer require so use it where possible.
+                  terminus drush ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- dl devel-8.x-1.0-rc2 views_custom_cache_tag
+                  terminus drush ${TERMINUS_SITE}.${CIRCLE_BUILD_NUM} -- en -y devel_generate views_custom_cache_tag_demo pantheon_advanced_page_cache
+            - run:
+                name: run behat
+                command: ./tests/behat/run-behat.sh

web/modules/pantheon_advanced_page_cache/.circleci/images/primary/Dockerfile

+FROM drupaldocker/php:7.0-cli
+
+RUN git clone https://github.com/pantheon-systems/terminus.git ~/terminus
+RUN cd ~/terminus && composer install
+RUN ln -s ~/terminus/bin/terminus /usr/local/bin/terminus
+RUN mkdir -p ~/.terminus/plugins
+RUN composer create-project -n -d ~/.terminus/plugins pantheon-systems/terminus-composer-plugin:^1
+
+# Why doesn't the drupaldocker/php image have drush?
+RUN git clone https://github.com/drush-ops/drush.git ~/drush
+RUN cd ~/drush && git checkout 8.x && composer install
+RUN ln -s ~/drush/drush /usr/local/bin/drush

web/modules/pantheon_advanced_page_cache/.gitignore

+/drush/behat-drush-endpoint
+/vendor
+

web/modules/pantheon_advanced_page_cache/LICENSE.txt

+                    GNU GENERAL PUBLIC LICENSE
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+
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+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
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+
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+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+
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+
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+
+This section is intended to make thoroughly clear what is believed to
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+
+  8. If the distribution and/or use of the Program is restricted in
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+original copyright holder who places the Program under this License
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+
+  9. The Free Software Foundation may publish revised and/or new versions
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+
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+
+  10. If you wish to incorporate parts of the Program into other free
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
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+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

web/modules/pantheon_advanced_page_cache/README.md

+# Pantheon Advanced Page Cache
+
+[![CircleCI](https://circleci.com/gh/pantheon-systems/pantheon_advanced_page_cache.svg?style=svg)](https://circleci.com/gh/pantheon-systems/pantheon_advanced_page_cache)
+
+Pantheon Advanced Page Cache module is a bridge between [Drupal cache metadata](https://www.drupal.org/docs/8/api/cache-api/cache-api) and the [Pantheon Global CDN](https://pantheon.io/docs/global-cdn/).
+
+Just by turning on this module your Drupal site will start emitting the HTTP headers necessary to make the Pantheon Global CDN aware of data underlying the response. Then, when the underlying data changes (nodes and taxonomy terms are updated, user permissions changed) this module will clear only the relevant pages from the edge cache.
+
+This module has no configuration settings of its own, just enable it and it will pass along information already present in Drupal 8 to the Global CDN.
+
+If you want to take finer grain control of how Drupal is handling it's cache data (in ways that will interact with both the Global CDN and internal Drupal caches) consider using [Views Custom Cache Tags](https://www.drupal.org/project/views_custom_cache_tag) and [Cache Control Override](https://www.drupal.org/project/cache_control_override).
+
+## Debugging
+
+By default, Pantheon's infrastructure strips out the `Surrogate-Key` response header before responses are served to clients. The contents of this header can be viewed as `Surrogate-Key-Raw` by adding on a debugging header to the request.
+
+A direct way of inspecting headers is with `curl -I`. This command will make a request and show just the response headers. Adding `-H "Pantheon-Debug:1"` will result in `Surrogate-Key-Raw` being included in the response headers. The complete command looks like this:
+
+ `curl -IH "Pantheon-Debug:1" https://dev-cache-tags-demo.pantheonsite.io/`
+
+ Piping to `grep` will filter the output down to just the `Surrogate-Key-Raw` header:
+
+`curl -IH "Pantheon-Debug:1" https://dev-cache-tags-demo.pantheonsite.io/ | grep -i Surrogate-Key-Raw`
+
+## Limit on header size
+
+Pantheon's nginx configuration limits total header size to 32k.
+This module caps the `Surrogate-Key` at 25,000 bytes to minimize the chances that a very long `Surrogate-Key` header combines with other long headers to trigger a 502 error.
+This limit can be reached if your site renders thousands of entities in a single response.
+You will see warning messages in your log directing you to [the issue queue](https://www.drupal.org/project/pantheon_advanced_page_cache/issues/2973861) if this limit is reached.
+## Feedback and collaboration
+
+For real time discussion of the module find Pantheon developers in our [Power Users Slack channel](https://pantheon.io/docs/power-users/). Bug reports and feature requests should be posted in [the drupal.org issue queue.](https://www.drupal.org/project/issues/pantheon_advanced_page_cache?categories=All) For code changes, please submit pull requests against the [GitHub repository](https://github.com/pantheon-systems/pantheon_advanced_page_cache) rather than posting patches to drupal.org.

web/modules/pantheon_advanced_page_cache/composer.json

+{
+    "name": "drupal/pantheon_advanced_page_cache",
+    "type": "drupal-module",
+    "require-dev": {
+        "drupal/coder": "^8.2",
+        "drupal/drupal-extension": "^3.3",
+        "phpunit/phpunit": "^6.3"
+    },
+    "scripts": {
+      "codesniff": [
+          "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+          "phpcs --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+          "phpcs  tests/behat  --standard=PSR2"
+      ],
+      "phpcbf": [
+          "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal src",
+          "phpcbf --report=full --extensions=php,module,inc,theme,info,install --standard=vendor/drupal/coder/coder_sniffer/Drupal tests/modules",
+          "phpcbf  tests/behat  --standard=PSR2"
+      ],
+
+      "phpunit": "phpunit tests --colors=always"
+    },
+    "repositories": {
+        "drupal": {
+            "type": "composer",
+            "url": "https://packages.drupal.org/8"
+        }
+    },
+    "minimum-stability": "stable",
+    "autoload": {
+        "psr-4": { "PantheonSystems\\CDNBehatHelpers\\": "tests/behat/helper_classes/" }
+    }
+}

web/modules/pantheon_advanced_page_cache/pantheon_advanced_page_cache.info.yml

+name: Pantheon Advanced Page Cache
+description: 'Advanced page cache capabilities for Pantheon.'
+package: Performance and scalability
+type: module
+# core: 8.x
+
+# Information added by Drupal.org packaging script on 2018-06-19
+version: '8.x-1.0'
+core: '8.x'
+project: 'pantheon_advanced_page_cache'
+datestamp: 1529441334

web/modules/pantheon_advanced_page_cache/pantheon_advanced_page_cache.services.yml

+services:
+  logger.channel.pantheon_advanced_page_cache:
+    parent: logger.channel_base
+    arguments: ['pantheon_advanced_page_cache']
+  pantheon_advanced_page_cache.cache_tags.invalidator:
+    class: Drupal\pantheon_advanced_page_cache\CacheTagsInvalidator
+    tags:
+      - { name: cache_tags_invalidator }
+  pantheon_advanced_page_cache.cacheable_response_subscriber:
+    class: Drupal\pantheon_advanced_page_cache\EventSubscriber\CacheableResponseSubscriber
+    arguments: ['@logger.channel.pantheon_advanced_page_cache']
+    tags:
+      - { name: event_subscriber }

web/modules/pantheon_advanced_page_cache/src/CacheTagsInvalidator.php

+<?php
+
+namespace Drupal\pantheon_advanced_page_cache;
+
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
+
+/**
+ * Cache tags invalidator implementation that invalidates the Pantheon edge.
+ */
+class CacheTagsInvalidator implements CacheTagsInvalidatorInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function invalidateTags(array $tags) {
+    if (function_exists('pantheon_clear_edge_keys')) {
+      pantheon_clear_edge_keys($tags);
+    }
+  }
+
+}

web/modules/pantheon_advanced_page_cache/src/EventSubscriber/CacheableResponseSubscriber.php

+<?php
+
+namespace Drupal\pantheon_advanced_page_cache\EventSubscriber;
+
+use Drupal\Core\Cache\CacheableResponseInterface;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Psr\Log\LoggerInterface;
+use Drupal\Core\Logger\RfcLogLevel;
+
+/**
+ * Adds Surrogate-Key header to cacheable master responses.
+ */
+class CacheableResponseSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The logger instance.
+   *
+   * @var \Psr\Log\LoggerInterface
+   */
+  protected $logger;
+
+  /**
+   * Constructs a new DefaultExceptionHtmlSubscriber.
+   *
+   * @param \Psr\Log\LoggerInterface $logger
+   *   The logger service.
+   */
+  public function __construct(LoggerInterface $logger) {
+    $this->logger = $logger;
+  }
+
+  /**
+   * Adds Surrogate-Key header to cacheable master responses.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
+   *   The event to process.
+   */
+  public function onRespond(FilterResponseEvent $event) {
+    if (!$event->isMasterRequest()) {
+      return;
+    }
+
+    $response = $event->getResponse();
+
+    if ($response instanceof CacheableResponseInterface) {
+      $tags = $response->getCacheableMetadata()->getCacheTags();
+
+      // Rename all _list cache tags to _emit_list to avoid clearing list cache
+      // tags by default.
+      foreach ($tags as $key => $tag) {
+        $tags[$key] = str_replace('_list', '_emit_list', $tag);
+      }
+
+      $tags_string = implode(' ', $tags);
+      if (25000 < strlen($tags_string)) {
+        $tags_string = substr($tags_string, 0, 25000);
+        // The string might have cut of in the middle of a tag.
+        // So now find the the last occurence of a space and cut to that length.
+        $tags_string = substr($tags_string, 0, strrpos($tags_string, ' '));
+        $this->logger->log(RfcLogLevel::WARNING, 'More cache tags were present than could be passed in the Surrogate-Key HTTP Header due to length constraints. To avoid a 502 error the list of surrogate keys was trimmed to a maximum length of 25,000 bytes. Since keys beyond the 25,000 maximum were removed this page will not be cleared from the cache when any of the removed keys are cleared (usually by entity save operations) as they have been stripped from the surrogate key header. See https://www.drupal.org/project/pantheon_advanced_page_cache/issues/2973861 for more information about how you can filter out redundant or unnecessary cache metadata.');
+      }
+      $response->headers->set('Surrogate-Key', $tags_string);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[KernelEvents::RESPONSE][] = ['onRespond'];
+    return $events;
+  }
+
+}

web/modules/pantheon_advanced_page_cache/tests/behat/behat-pantheon.yml

+#
+# behat.yml file for testing with a Drupal site on Pantheon.
+#
+default:
+  suites:
+    default:
+      paths:
+        - %paths.base%/features
+      contexts:
+        - Drupal\DrupalExtension\Context\DrushContext
+        - Drupal\DrupalExtension\Context\DrupalContext
+        - Drupal\DrupalExtension\Context\MinkContext
+        - PantheonSystems\CDNBehatHelpers\Contexts\FeatureContext
+  extensions:
+    Behat\MinkExtension:
+      goutte: ~
+# Supplied by env variable.
+#     base_url: http://dev-d8cdn.pantheonsite.io/
+    Drupal\DrupalExtension:
+      blackbox: ~
+      api_driver: 'drush'
+      drush:
+# Supplied by env variable.
+#     alias: '@pantheon.d8cdn.dev'

web/modules/pantheon_advanced_page_cache/tests/behat/features/huge_header_warning.feature

+Feature: Huge Header Warning
+In order to understand the caching behavior of my site
+As an administrator
+I need a notification when my header is truncated.
+
+  @api
+  Scenario: Warning message.
+    Given I run drush "pm-uninstall -y pantheon_advanced_page_cache_test"
+    Given I run drush "en -y pantheon_advanced_page_cache"
+    And I am logged in as a user with the "administrator" role
+
+    And there are 10 article nodes with a huge number of taxonomy terms each
+    When I visit "/node"
+    And I visit "admin/reports/dblog"
+    And I click "More cache tags were present than could be passed in…" in the "pantheon_advanced_page_cache" row
+    Then I should see "More cache tags were present than could be passed in the Surrogate-Key HTTP Header due to length constraints"
+
+    @api
+  Scenario: No warning message after enabling test module.
+    Given I run drush "en -y pantheon_advanced_page_cache_test"
+    And I am logged in as a user with the "administrator" role
+    And I visit "admin/reports/dblog/confirm"
+    And I press "Confirm"
+    And there are 10 article nodes with a huge number of taxonomy terms each
+    When I visit "/node"
+    And I visit "admin/reports/dblog"
+    Then I should not see "pantheon_advanced_page_cache"

web/modules/pantheon_advanced_page_cache/tests/behat/features/views_custom_cache_tag.feature

+Feature: Views custom cache tags
+In order to keep as many pages cached as possible when content is updated
+As an administrator
+I want to use granular cache tags for Views that reflect the type of content displayed by the View.
+
+  Background:
+
+    When I run drush "en -y views_custom_cache_tag_demo pantheon_advanced_page_cache"
+    And drush output should contain "views_custom_cache_tag_demo is already enabled."
+    And drush output should contain "pantheon_advanced_page_cache is already enabled."
+
+  @api
+  Scenario: Node type-based expiration
+    Given there are some "page" nodes
+    And "custom-cache-tags/page" is caching
+    And there are some "article" nodes
+    And "custom-cache-tags/article" is caching
+
+    # When I make a new page node
+    When a generate a "page" node
+    # Then the page listing is cleared the article is not
+    Then "custom-cache-tags/page" has been purged
+    And "custom-cache-tags/page" is caching
+    And "custom-cache-tags/article" has not been purged
+
+    # @todo, add scenario for demo module being turned off
+    # @todo, check actual surrogate key header.
\ No newline at end of file