Скачать или смотреть Solving Laravel's Disk Retrieval in Macros: Access a Specified Disk for CDN URLs

Learn how to create a Laravel macro to retrieve CDN URLs for specified disks using the `FilesystemAdapter`. Discover the steps to effectively implement this in your application.
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This video is based on the question https://stackoverflow.com/q/75987634/ asked by the user 'birbhouse' ( https://stackoverflow.com/u/12520705/ ) and on the answer https://stackoverflow.com/a/75988766/ provided by the user 'Khang Tran' ( https://stackoverflow.com/u/11085413/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Access a Specified Disk for CDN URLs in Laravel: A Guide to FilesystemAdapter Macros

When working with Laravel's powerful filesystem, you might find yourself wanting to create a macro that retrieves CDN (Content Delivery Network) URLs for files stored in various disks. However, passing the specified disk correctly into your macro can be a bit tricky. This guide will guide you through how to achieve this effectively with clear, step-by-step instructions.

The Challenge: Retrieving the Disk Name

The problem lies in accessing the disk name dynamically within a macro defined for the FilesystemAdapter. As an example, let's say you created a macro cdnUrl that returns the CDN URL for a specified file. However, you may encounter difficulties in directly accessing the name of the disk you are currently using, because it appears as a League\Flysystem\Filesystem object instead of the name string you need.

Your Starting Code

Here's the code where you attempt to create that macro in your StorageMacroServiceProvider:

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You call the macro using:

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While you successfully retrieve the disk name based on the driver used, you might find that this approach leads you nowhere because the $diskName isn't in the format you need.

The Solution: Simplifying Your Macro

Understanding Storage::disk()

The key to simplifying your macro lies in understanding how Storage::disk() works. The argument passed to Storage::disk() determines the adapter instance returned. For instance, when you call Storage::disk('local'), it provides you with an instance of FilesystemAdapter that corresponds to the local disk.

Streamlined Macro Code

Instead of trying to get the disk name inside your macro, you can directly utilize the capabilities of the FilesystemAdapter. You can modify your macro as follows:

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Explanation

What Changed: Instead of referencing the disk name, you utilize the $this keyword within the macro. This refers to the FilesystemAdapter instance corresponding to the disk you've selected.

Direct URL Retrieval: The url($filename) method is readily available on that instance, which allows you to generate the proper URL for the file without needing the disk name.

Putting It All Together: Usage Example

Now, when you call the cdnUrl macro like this:

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It will effectively generate the CDN URL using the local disk setup, without any complications regarding accessing the disk name.

Conclusion

Creating macros in Laravel can boost your application's functionality by providing reusable methods across your filesystem operations. By understanding how to access the FilesystemAdapter directly, as demonstrated above, you can easily create a macro that meets your needs without unnecessary complexity.

By following these steps, you'll ensure that your application can retrieve CDN URLs efficiently for any specified disk. Happy coding!