I am building an app which allows users to create posts like twitter. Each post can have upto 10 images attached. I need to store all images in its original size in Azure blob storage but also require 2 smaller size (thumbnail) versions to display previews in the app.
My backend is Laravel (PHP) and the app is android. I have some idea on how to do this but I struggling between many pros and cons of each approach. I am asking this here to know any tried and tested implementation.
Some constraints:
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Post should only be created after all images are uploaded and thumbnail URL links are generated.
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User should not have to stay in the app while image uploading/processing is in progress. Idea is to minimize user impact.
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All images are to be stored in Azure blob storage. Backend service can be used temporarily for the purpose but files cannot be stored in these servers for long.
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Only the owner of the post is allowed to create the image blobs. But the images can be read by public. This is anyway a functionality of Azure storage and doesn't require any custom work.
Some additional questions:
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Where is the best places to process images to thumbnails - app or server ?
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How does Whatsapp/Facebook/Twitter achieve this in their design ?
Let me know if you need any additional details for a better design approach. Please feel free to throw any idea or share any source where I can read up on something similar.
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