Post image to wordpress and use it in the article.

wordpress.rb

require 'faraday'
require 'base64'
require 'json'

# Generated password using application-passwords plugin
authorization = 'Basic ' + Base64.encode64('username:password')



# post image
wp_api_url = 'https://example.com/wp-json/wp/v2'

connection = Faraday.new(wp_api_url) do |builder|
  builder.request :multipart
  builder.request :url_encoded
  builder.adapter Faraday.default_adapter
end
connection.headers['Authorization'] = authorization
params = { file: Faraday::UploadIO.new('tokyo.png', 'image/png') }

response = JSON.parse(connection.post('media', params).body)

# post article
header = {
  'Content-Type' => 'application/json',
  'Authorization' => authorization
}

tag = format('
<!-- wp:image {"id":%d,"sizeSlug":"large"} -->
<figure class="wp-block-image size-large"><img src="%s" alt="" class="wp-image-%s"/></figure>
<!-- /wp:image -->
', response['id'], response['media_details']['sizes']['full']['source_url'], response['id'])

post_data = {
  title: '日本語',
  content: tag,
  status: 'draft', # publish
  categories: '1',
  slug: 'covidtokyo',
  featured_media: response['id'],
  tags: '1'
}.to_json
response = Faraday.post(wp_api_url + '/posts', post_data, header)
p JSON.parse(response.body)