Basic Ruby client to the Automatic1111 WebUI API

webui_client.rb

require 'json'
require 'rest-client'
require 'base64'

url = "http://localhost:7860"
payload = {
  "prompt": "liminal space, unusual lighting, sinister presence",
  "negative_prompt": "",
  "steps": 30,
  "sampler_name": "Euler a",
  "cfg_scale": 5.5,
  "restore_faces": true,
  "seed": 123456,
  "batch_size": 4
}

response = RestClient.post "#{url}/sdapi/v1/txt2img", payload.to_json, {content_type: :json, accept: :json}

r = JSON.parse(response.body)

r["images"].each.with_index do |image, i|
  image_data = Base64.decode64(image)
  File.open("output#{i}.png", 'wb') { |f| f.write(image_data) }
end