Class: Clacky::Media::OpenAICompat

Inherits:
Base
  • Object
show all
Defined in:
lib/clacky/media/openai_compat.rb

Overview

OpenAI-compatible image generation provider.

Talks to POST <base_url>/images/generations with the standard OpenAI request shape. Handles three providers under one class because they all expose the same endpoint: OpenAI, OpenRouter, and the openclacky platform gateway. Provider-specific quirks (model id naming, billing) live in PRESETS, not here.

Constant Summary collapse

ASPECT_TO_SIZE = 
{
  "landscape" => "1536x1024",
  "square"    => "1024x1024",
  "portrait"  => "1024x1536"
}.freeze
DEFAULT_ASPECT = 
"landscape"

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Clacky::Media::Base

Instance Method Details

#generate_image(prompt:, aspect_ratio: DEFAULT_ASPECT, output_dir: nil, n: 1, **_kwargs) ⇒ Object 



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# File 'lib/clacky/media/openai_compat.rb', line 25

def generate_image(prompt:, aspect_ratio: DEFAULT_ASPECT, output_dir: nil, n: 1, **_kwargs)
  provider_id = Clacky::Providers.find_by_base_url(@base_url) || "custom"
  aspect      = ASPECT_TO_SIZE.key?(aspect_ratio) ? aspect_ratio : DEFAULT_ASPECT
  size        = ASPECT_TO_SIZE[aspect]

  if prompt.to_s.strip.empty?
    return error_response(
      error: "Prompt is required and must be a non-empty string",
      error_type: "invalid_argument",
      provider: provider_id,
      aspect_ratio: aspect
    )
  end

  if @api_key.to_s.empty?
    return error_response(
      error: "api_key not configured for image model '#{@model}'",
      error_type: "auth_required",
      provider: provider_id,
      prompt: prompt,
      aspect_ratio: aspect
    )
  end

  payload = { model: @model, n: n }
  if gemini_family?(@model)
    # Gemini image models (routed via openclacky / openrouter gateway)
    # don't accept the OpenAI `size` parameter — they infer aspect from
    # the prompt text. Embedding a hint keeps the user's aspect choice
    # honoured without breaking the gateway request validator.
    payload[:prompt] = "#{prompt}\n\n[aspect: #{aspect}]"
  else
    payload[:prompt] = prompt
    payload[:size]   = size
  end

  begin
    response = connection.post("images/generations") do |req|
      req.headers["Content-Type"]  = "application/json"
      req.headers["Authorization"] = "Bearer #{@api_key}"
      req.body = JSON.generate(payload)
    end
  rescue Faraday::Error => e
    return error_response(
      error: "HTTP request failed: #{e.message}",
      error_type: "network_error",
      provider: provider_id,
      prompt: prompt,
      aspect_ratio: aspect
    )
  end

  unless response.success?
    return error_response(
      error: "Upstream #{response.status}: #{truncate(response.body, 500)}",
      error_type: "api_error",
      provider: provider_id,
      prompt: prompt,
      aspect_ratio: aspect
    )
  end

  body = parse_json(response.body)
  return error_response(
    error: "Invalid JSON response from upstream",
    error_type: "invalid_response",
    provider: provider_id,
    prompt: prompt,
    aspect_ratio: aspect
  ) unless body.is_a?(Hash)

  data = body["data"] || []
  first = data.first
  if first.nil?
    return error_response(
      error: "Upstream returned no image data",
      error_type: "empty_response",
      provider: provider_id,
      prompt: prompt,
      aspect_ratio: aspect
    )
  end

  image_ref =
    if first["b64_json"]
      save_b64_image(first["b64_json"], output_dir: output_dir || Dir.pwd, prefix: "img")
    elsif first["url"]
      first["url"]
    end

  if image_ref.nil?
    return error_response(
      error: "Response contained neither b64_json nor url",
      error_type: "empty_response",
      provider: provider_id,
      prompt: prompt,
      aspect_ratio: aspect
    )
  end

  success_response(
    image: image_ref,
    prompt: prompt,
    aspect_ratio: aspect,
    provider: provider_id,
    extra: {
      "size"     => size,
      "usage"    => body["usage"],
      "cost_usd" => body["cost_usd"]
    }.compact
  )
end