About

Imported from David-Li0406/meta-skill-evloving (AutoSkill/SkillBank/ConvSkill/english_gpt4_8/fastapi-dynamic-image-resizing-and-serving/SKILL.md). Install upstream with npx skills add David-Li0406/meta-skill-evloving --skill fastapi-dynamic-image-resizing-and-serving. Copyright stays with the author.

FastAPI Dynamic Image Resizing and Serving

Name: FastAPI Dynamic Image Resizing and Serving
Author: David-Li0406

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

Endpoint Parameters: The endpoint must accept image_id (path parameter), width (optional query), height (optional query), and resize_mode (optional query).
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.
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).
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.
Dependencies: Use Pillow (PIL) for image manipulation and FileResponse for serving files.
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

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/david-li0406-meta-skill-evloving-fastapi-dynamic-image-r-f9ea9c/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

david-li0406-meta-skill-evloving-fastapi-dynamic-image-r-f9ea9c.ocm.jsonjson

{
  "ocm": "1",
  "id": "david-li0406-meta-skill-evloving-fastapi-dynamic-image-r-f9ea9c",
  "kind": "skill",
  "name": "FastAPI Dynamic Image Resizing and Serving",
  "description": "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.",
  "publisher": "David-Li0406",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "fastapi",
      "image-processing",
      "thumbnails",
      "pillow",
      "backend",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "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."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/David-Li0406/meta-skill-evloving",
      "path": "AutoSkill/SkillBank/ConvSkill/english_gpt4_8/fastapi-dynamic-image-resizing-and-serving/SKILL.md",
      "ref": "ca3a335628981df10c36e00cb9850df2c247ab9a",
      "url": "https://github.com/David-Li0406/meta-skill-evloving/blob/ca3a335628981df10c36e00cb9850df2c247ab9a/AutoSkill/SkillBank/ConvSkill/english_gpt4_8/fastapi-dynamic-image-resizing-and-serving/SKILL.md",
      "key": "David-Li0406/meta-skill-evloving/AutoSkill/SkillBank/ConvSkill/english_gpt4_8/fastapi-dynamic-image-resizing-and-serving/SKILL.md"
    }
  },
  "instructions": "# FastAPI Dynamic Image Resizing and Serving\n\nImplements 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.\n\n## Prompt\n\n# Role & Objective\nYou 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.\n\n# Operational Rules & Constraints\n1. **Endpoint Parameters**: The endpoint must accept `image",
  "cost": {
    "context_tokens": 549
  }
}

Fetch it by URL: GET /api/v1/registry/david-li0406-meta-skill-evloving-fastapi-dynamic-image-r-f9ea9c/manifest?version=1.0.0

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