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DOC Update change log to reference updated migration task (#8945)
* DOC Update change log to reference updated migration task * Update docs/en/04_Changelogs/4.4.0.md
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Maxime Rainville
Ingo Schommer
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### Adopting to new `_resources` directory
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The name of the directory where vendor module resources are exposed can now be configured by defining a `extra.resources-dir` key in your `composer.json` file. If the key is not set, it will automatically default to `resources`. New projects will be preset to `_resources`.
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This will avoid potential conflict with SiteTree URL Segments.
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1. Update your `.gitignore` file to ignore the new `_resources` directory. This file is typically located in the root of your project or in the `public` folder.
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2. Add a new `extra.resources-dir` key to your composer file.
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```js
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You may also need to update your server configuration if you have applied special conditions to the `resources` path.
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### Optional migration to hash-less public asset URLs {#hashless-urls}
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SilverStripe 4.x introduced an [asset abstraction](https://docs.silverstripe.org/en/4/developer_guides/files/file_storage/)
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system which required a [file migration](https://docs.silverstripe.org/en/4/developer_guides/files/file_migration/) task.
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It allowed files to be access protected, have a separate draft stage,
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and track changes to file metadata and their contents through the `Versioned` system.
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This change defaulted to adding a content "hash" to file paths,
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unless the migration was performed with `legacy_filenames=true`.
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The hash would be updated when file contents change, and any link generated
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through SilverStripe (e.g. through `HTMLText` or `$Image` template placeholders)
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would automatically adjust. However, any direct links from search engines, bookmarks, etc would break.
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This limitation was pointed out in the [upgrading advice](4.0.0#asset-storage) to developers,
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but the impact wasn’t sufficiently highlighted.
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SilverStripe 4.3.2 introduced a redirect to fix those broken links.
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Dynamic redirects are more resource intensive than serving static files.
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With SilverStripe 4.4.0, we're providing an optional migration script
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to move public files into their "hash-less" locations, removing the need for most redirects.
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The original "hashed" file paths continue to work through redirects.
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In order to opt-in to moving these files, run the following command:
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```
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vendor/bin/sake dev/tasks/MigrateFileTask
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```
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Note that you can run this task without CLI access by installing and configuring
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the [queuedjobs](https://github.com/symbiote/silverstripe-queuedjobs) module.
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Further information is provided in the [Hash-less Public Asset URLs FAQ](#hashless-faq) below.
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### Hash-less Public Asset URLs FAQ {#hashless-faq}
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#### How are files named and renamed?
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Here's an example of how file names changed during an initial 4.x migration, and when upgrading to 4.4:
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* Original file created under SS 3.x: assets/myfile.pdf
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* File migrated under SS 4.x with `legacy_filenames=false`: `assets/[content-hash]/myfile.pdf` (Regression: links to `assets/myfile.pdf` no longer work)
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* File migrated under SS 4.x with `legacy_filenames=true`: `assets/myfile.pdf`
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* File with updated file content under SS 4.x: `assets/[new-content-hash]/myfile.pdf` (Regression: links to `assets/[content-hash]/myfile.pdf` no longer work)
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* File with hotfix applied (SS 4.2.3): `assets/myfile.pdf` and `assets/[old-content-hash]/myfile.pdf` redirects to `assets/[new-content-hash]/myfile.pdf`
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* File with full fix applied (SS 4.3.x) : `assets/myfile.pdf` and `assets/[old-content-hash]/myfile.pdf` redirects to `assets/[new-content-hash]/myfile.pdf`
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* Newly uploaded file with full fix applied (SS 4.4.0): `assets/my-other-file.pdf` (no redirect required)
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More details on how files are stored can be found in the
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["File Storage" guide](/developer_guides/files/file_storage).
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#### How are redirects handled?
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Redirects from (now legacy) hashed public URLs default to `301 Permanent Redirect`.
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By opting into the [file migration to hash-less public URLs](#hashless-urls),
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you can minimise these redirects. SilverStripe will automatically generate hash-less public URLs regardless,
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but external links might still point to legacy hashed public URLs.
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If you have a high traffic site with lots of direct references to asset URLs
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(e.g. search engines indexing popular PDF documents),
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we recommend that you configure HTTP caching for these redirects
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in your webserver (e.g. through `.htaccess`).
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The redirect code can be configured via `FlysystemAssetStore.permanent_redirect_response_code`.
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If you upgrade an older SilverStripe 4 project to SilverStripe 4.4 and choose not to run the file migration task,
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your files will still be stored under an "hash" folder. Browsers who try to access this file via the "hashless" url will
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be redirected to the "hash" URL with a `302 Temporary Redirect`.
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The temporary redirect code can be configured via `FlysystemAssetStore.redirect_response_code`.
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#### Do I need to regenerate HTML with existing links to assets?
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Pages and other views can contain links to asset locations,
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e.g. as HTML content rendered with `<img>` and `<a>` tags.
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These might point to old locations of files (prior to running the optional migration).
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While SilverStripe will automatically fix these references the next time the view is rendered,
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this content is often cached (e.g. in a CDN).
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We have implemented an automatic redirect for URLs pointing to asset
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locations prior to running the optional migration script,
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so there is no need to regenerate any content.
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#### Is there any data loss or data integrity issue?
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There are no known issues around data integrity.
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All files that were available on a SS 3.x site are still available after upgrading to SS 4.x.
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#### Will this change affect my search engine ranking?
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As long as your files are still linked on your website,
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search engines will pick up the new links on any projects which have already been migrated.
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The 4.3.2 bugfix will redirect links, which passes on any SEO rankings to the new link location.
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Since links to files should be permanent after the bugfix has been applied,
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this can lead to improved search engine rankings (since existing files under new links don’t need to be re-ranked by search engines).
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#### Can I migrate away from the legacy_filenames=true option?
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Yes. Simply disable `legacy_filenames` in your YML configuration, then run the `MigrateFileTask`. This will normalise
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the path of all existing assets.
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#### Can I still choose legacy_filenames=true when starting new upgrades?
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Technically yes, but you need to be aware of the tradeoffs. Once the regression has been fixed, we don’t see the need
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for people to choose this option any more.
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SilverStripe 4.4, ignores the `legacy_filenames` in most situation. Enabling `legacy_filenames` on a fresh SilverStripe
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4.4 installation will have no affect.
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#### How do I test that the fix has worked on my site?
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Before applying the upgrade and migration script:
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Find an existing published and draft file. Get the link by clicking on the preview in `admin/assets`.
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It should link to `assets/[hash]/myfile.pdf`.
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After applying the upgrade and migration task, you can test that it applied correctly.
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Please perform these tests on a test or UAT environment, since your local environment might have different routing
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conditions.
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* Check that the file still routes correctly with the hash in place (should redirect)
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* Remove `[hash]/`, and check that it still routes correctly (should not redirect)
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#### Will this patch redirect URLs for previous file versions?
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Yes, it will attempt to find the most recent public "hash-less" URL
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for this file and redirect to it.
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## Changes to internal APIs
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- `PDOQuery::__construct()` now has a 2nd argument. If you have subclassed PDOQuery and overridden __construct()
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