nixpkgs/nixos/modules/services/web-apps/pict-rs.md

Pict-rs

pict-rs is a a simple image hosting service.

Quickstart

the minimum to start pict-rs is

{
  services.pict-rs.enable = true;
}

this will start the http server on port 8080 by default.

Usage

pict-rs offers the following endpoints:

• POST /image for uploading an image. Uploaded content must be valid multipart/form-data with an image array located within the images[] key

  This endpoint returns the following JSON structure on success with a 201 Created status

  {
      "files": [
          {
              "delete_token": "JFvFhqJA98",
              "file": "lkWZDRvugm.jpg"
          },
          {
              "delete_token": "kAYy9nk2WK",
              "file": "8qFS0QooAn.jpg"
          },
          {
              "delete_token": "OxRpM3sf0Y",
              "file": "1hJaYfGE01.jpg"
          }
      ],
      "msg": "ok"
  }
  

• GET /image/download?url=... Download an image from a remote server, returning the same JSON payload as the POST endpoint

• GET /image/original/{file} for getting a full-resolution image. file here is the file key from the /image endpoint's JSON

• GET /image/details/original/{file} for getting the details of a full-resolution image. The returned JSON is structured like so:

  {
      "width": 800,
      "height": 537,
      "content_type": "image/webp",
      "created_at": [
          2020,
          345,
          67376,
          394363487
      ]
  }
  

• GET /image/process.{ext}?src={file}&... get a file with transformations applied. existing transformations include

  • identity=true: apply no changes
  • blur={float}: apply a gaussian blur to the file
  • thumbnail={int}: produce a thumbnail of the image fitting inside an {int} by {int} square using raw pixel sampling
  • resize={int}: produce a thumbnail of the image fitting inside an {int} by {int} square using a Lanczos2 filter. This is slower than sampling but looks a bit better in some cases
  • crop={int-w}x{int-h}: produce a cropped version of the image with an {int-w} by {int-h} aspect ratio. The resulting crop will be centered on the image. Either the width or height of the image will remain full-size, depending on the image's aspect ratio and the requested aspect ratio. For example, a 1600x900 image cropped with a 1x1 aspect ratio will become 900x900. A 1600x1100 image cropped with a 16x9 aspect ratio will become 1600x900.

  Supported ext file extensions include png, jpg, and webp

  An example of usage could be

  GET /image/process.jpg?src=asdf.png&thumbnail=256&blur=3.0
  

  which would create a 256x256px JPEG thumbnail and blur it

• GET /image/details/process.{ext}?src={file}&... for getting the details of a processed image. The returned JSON is the same format as listed for the full-resolution details endpoint.

• DELETE /image/delete/{delete_token}/{file} or GET /image/delete/{delete_token}/{file} to delete a file, where delete_token and file are from the /image endpoint's JSON

Missing

• Configuring the secure-api-key is not included yet. The envisioned basic use case is consumption on localhost by other services without exposing the service to the internet.