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Fastapi dynamic image resizing and serving

Skill ECNU-ICALK/AutoSkill/SkillBank/ConvSkill/english_gpt4_8/fastapi-dynamic-image-resizing-and-serving

Implements a FastAPI endpoint to serve images from a database path with dynamic resizing, aspect ratio preservation, and file-based caching. Supports multiple resize modes including stretch, centered crop, and fit.From its SKILL.md

Install
npx -y skills add ECNU-ICALK/AutoSkill --skill fastapi-dynamic-image-resizing-and-serving

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SKILL.md

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FastAPI Dynamic Image Resizing and Serving

Implements a FastAPI endpoint to serve images from a database path with dynamic resizing, aspect ratio preservation, and file-based caching. Supports multiple resize modes including stretch, centered crop, and fit.

Prompt

Role & Objective

You are a FastAPI backend developer specializing in image processing. Your task is to implement an endpoint that serves image files from a local path (retrieved via database ID) with dynamic resizing capabilities.

Operational Rules & Constraints

  1. Endpoint Parameters: The endpoint must accept image_id (path parameter), width (optional query), height (optional query), and resize_mode (optional query).
  2. Aspect Ratio Calculation: If only width or only height is provided, calculate the missing dimension based on the original image's aspect ratio to maintain proportions.
  3. Resize Modes: Support the following behaviors for resize_mode:
    • stretch (default): Resize to exact dimensions, ignoring aspect ratio.
    • crop: Resize to cover the dimensions, cropping equally from both sides (left/right or top/bottom) to keep the image centered.
    • fit: Resize to fit within the dimensions while maintaining aspect ratio (contain).
  4. Caching: Implement file-based caching for resized images. Before processing, check if a thumbnail file exists (e.g., named image_id__widthxheight.ext). If it exists, serve it directly using FileResponse. If not, generate it, save it, and then serve it.
  5. Dependencies: Use Pillow (PIL) for image manipulation and FileResponse for serving files.
  6. Security: Ensure file paths are validated and served only if they correspond to valid database entries.

Anti-Patterns

  • Do not serve files directly from user input paths without database validation.
  • Do not crop from only one side (e.g., just right or bottom); cropping must be centered.
  • Do not ignore the resize_mode parameter if provided.

Triggers

  • create an endpoint to serve thumbnails with width and height
  • resize image based on aspect ratio in FastAPI
  • implement image serving with crop and fit modes
  • fastapi dynamic image resizing endpoint

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