Import Action Text

10 files changed, 215 insertions, 0 deletions

diff --git a/actiontext/app/helpers/action_text/content_helper.rb b/actiontext/app/helpers/action_text/content_helper.rb
new file mode 100644
index 0000000000..b3335601f9
--- /dev/null
+++ b/actiontext/app/helpers/action_text/content_helper.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module ActionText
+  module ContentHelper
+    SANITIZER          = Rails::Html::Sanitizer.white_list_sanitizer
+    ALLOWED_TAGS       = SANITIZER.allowed_tags + [ ActionText::Attachment::TAG_NAME, "figure", "figcaption" ]
+    ALLOWED_ATTRIBUTES = SANITIZER.allowed_attributes + ActionText::Attachment::ATTRIBUTES
+
+    def render_action_text_content(content)
+      content = content.render_attachments do |attachment|
+        unless attachment.in?(content.gallery_attachments)
+          attachment.node.tap do |node|
+            node.inner_html = render(attachment, in_gallery: false).chomp
+          end
+        end
+      end
+
+      content = content.render_attachment_galleries do |attachment_gallery|
+        render(layout: attachment_gallery, object: attachment_gallery) do
+          attachment_gallery.attachments.map do |attachment|
+            attachment.node.inner_html = render(attachment, in_gallery: true).chomp
+            attachment.to_html
+          end.join("").html_safe
+        end.chomp
+      end
+
+      sanitize content.to_html, tags: ALLOWED_TAGS, attributes: ALLOWED_ATTRIBUTES
+    end
+  end
+end
diff --git a/actiontext/app/helpers/action_text/tag_helper.rb b/actiontext/app/helpers/action_text/tag_helper.rb
new file mode 100644
index 0000000000..837b2264b1
--- /dev/null
+++ b/actiontext/app/helpers/action_text/tag_helper.rb
@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+module ActionText
+  module TagHelper
+    cattr_accessor(:id, instance_accessor: false) { 0 }
+
+    # Returns a `trix-editor` tag that instantiates the Trix JavaScript editor as well as a hidden field
+    # that Trix will write to on changes, so the content will be sent on form submissions.
+    #
+    # ==== Options
+    # * <tt>:class</tt> - Defaults to "trix-content" which ensures default styling is applied.
+    #
+    # ==== Example
+    #
+    #   rich_text_area_tag "content", message.content
+    #   # <input type="hidden" name="content" id="trix_input_post_1">
+    #   # <trix-editor id="content" input="trix_input_post_1" class="trix-content" ...></trix-editor>
+    def rich_text_area_tag(name, value = nil, options = {})
+      options = options.symbolize_keys
+
+      options[:input] ||= "trix_input_#{ActionText::TagHelper.id += 1}"
+      options[:class] ||= "trix-content"
+
+      options[:data] ||= {}
+      options[:data][:direct_upload_url] = main_app.rails_direct_uploads_url
+      options[:data][:blob_url_template] = main_app.rails_service_blob_url(":signed_id", ":filename")
+
+      editor_tag = content_tag("trix-editor", "", options)
+      input_tag = hidden_field_tag(name, value, id: options[:input])
+
+      input_tag + editor_tag
+    end
+  end
+end
+
+module ActionView::Helpers
+  class Tags::ActionText < Tags::Base
+    delegate :dom_id, to: ActionView::RecordIdentifier
+
+    def render
+      options = @options.stringify_keys
+      add_default_name_and_id(options)
+      options["input"] ||= dom_id(object, [options["id"], :trix_input].compact.join("_")) if object
+      @template_object.rich_text_area_tag(options.delete("name"), editable_value, options)
+    end
+
+    def editable_value
+      value&.body.try(:to_trix_html)
+    end
+  end
+
+  module FormHelper
+    # Returns a `trix-editor` tag that instantiates the Trix JavaScript editor as well as a hidden field
+    # that Trix will write to on changes, so the content will be sent on form submissions.
+    #
+    # ==== Options
+    # * <tt>:class</tt> - Defaults to "trix-content" which ensures default styling is applied.
+    #
+    # ==== Example
+    #   form_with(model: @message) do |form|
+    #     form.rich_text_area :content
+    #   end
+    #   # <input type="hidden" name="message[content]" id="message_content_trix_input_message_1">
+    #   # <trix-editor id="content" input="message_content_trix_input_message_1" class="trix-content" ...></trix-editor>
+    def rich_text_area(object_name, method, options = {})
+      Tags::ActionText.new(object_name, method, self, options).render
+    end
+  end
+
+  class FormBuilder
+    def rich_text_area(method, options = {})
+      @template.rich_text_area(@object_name, method, objectify_options(options))
+    end
+  end
+end
diff --git a/actiontext/app/javascript/actiontext/attachment_upload.js b/actiontext/app/javascript/actiontext/attachment_upload.js
new file mode 100644
index 0000000000..a716f1f589
--- /dev/null
+++ b/actiontext/app/javascript/actiontext/attachment_upload.js
@@ -0,0 +1,45 @@
+import { DirectUpload } from "activestorage"
+
+export class AttachmentUpload {
+  constructor(attachment, element) {
+    this.attachment = attachment
+    this.element = element
+    this.directUpload = new DirectUpload(attachment.file, this.directUploadUrl, this)
+  }
+
+  start() {
+    this.directUpload.create(this.directUploadDidComplete.bind(this))
+  }
+
+  directUploadWillStoreFileWithXHR(xhr) {
+    xhr.upload.addEventListener("progress", event => {
+      const progress = event.loaded / event.total * 100
+      this.attachment.setUploadProgress(progress)
+    })
+  }
+
+  directUploadDidComplete(error, attributes) {
+    if (error) {
+      throw new Error(`Direct upload failed: ${error}`)
+    }
+
+    this.attachment.setAttributes({
+      sgid: attributes.attachable_sgid,
+      url: this.createBlobUrl(attributes.signed_id, attributes.filename)
+    })
+  }
+
+  createBlobUrl(signedId, filename) {
+    return this.blobUrlTemplate
+      .replace(":signed_id", signedId)
+      .replace(":filename", encodeURIComponent(filename))
+  }
+
+  get directUploadUrl() {
+    return this.element.dataset.directUploadUrl
+  }
+
+  get blobUrlTemplate() {
+    return this.element.dataset.blobUrlTemplate
+  }
+}
diff --git a/actiontext/app/javascript/actiontext/index.js b/actiontext/app/javascript/actiontext/index.js
new file mode 100644
index 0000000000..c149eda952
--- /dev/null
+++ b/actiontext/app/javascript/actiontext/index.js
@@ -0,0 +1,11 @@
+import * as Trix from "trix"
+import { AttachmentUpload } from "./attachment_upload"
+
+addEventListener("trix-attachment-add", event => {
+  const { attachment, target } = event
+
+  if (attachment.file) {
+    const upload = new AttachmentUpload(attachment, target)
+    upload.start()
+  }
+})
diff --git a/actiontext/app/models/action_text/rich_text.rb b/actiontext/app/models/action_text/rich_text.rb
new file mode 100644
index 0000000000..717e93599f
--- /dev/null
+++ b/actiontext/app/models/action_text/rich_text.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# The RichText record holds the content produced by the Trix editor in a serialized `body` attribute.
+# It also holds all the references to the embedded files, which are stored using Active Storage.
+# This record is then associated with the Active Record model the application desires to have
+# rich text content using the `has_rich_text` class method.
+class ActionText::RichText < ActiveRecord::Base
+  self.table_name = "action_text_rich_texts"
+
+  serialize :body, ActionText::Content
+  delegate :to_s, :nil?, to: :body
+
+  belongs_to :record, polymorphic: true, touch: true
+  has_many_attached :embeds
+
+  before_save do
+    self.embeds = body.attachments.map(&:attachable) if body.present?
+  end
+
+  def to_plain_text
+    body&.to_plain_text.to_s
+  end
+
+  delegate :blank?, :empty?, :present?, to: :to_plain_text
+end
diff --git a/actiontext/app/views/action_text/attachables/_missing_attachable.html.erb b/actiontext/app/views/action_text/attachables/_missing_attachable.html.erb
new file mode 100644
index 0000000000..5ffd93b89e
--- /dev/null
+++ b/actiontext/app/views/action_text/attachables/_missing_attachable.html.erb
@@ -0,0 +1 @@
+<%= "☒" -%>
diff --git a/actiontext/app/views/action_text/attachables/_remote_image.html.erb b/actiontext/app/views/action_text/attachables/_remote_image.html.erb
new file mode 100644
index 0000000000..3372f8d940
--- /dev/null
+++ b/actiontext/app/views/action_text/attachables/_remote_image.html.erb
@@ -0,0 +1,8 @@
+<figure class="attachment attachment--preview">
+  <%= image_tag(remote_image.url, width: remote_image.width, height: remote_image.height) %>
+  <% if caption = remote_image.try(:caption) %>
+    <figcaption class="attachment__caption">
+      <%= caption %>
+    </figcaption>
+  <% end %>
+</figure>
diff --git a/actiontext/app/views/action_text/attachment_galleries/_attachment_gallery.html.erb b/actiontext/app/views/action_text/attachment_galleries/_attachment_gallery.html.erb
new file mode 100644
index 0000000000..6bc8674dc5
--- /dev/null
+++ b/actiontext/app/views/action_text/attachment_galleries/_attachment_gallery.html.erb
@@ -0,0 +1,3 @@
+<div class="attachment-gallery attachment-gallery--<%= attachment_gallery.size %>">
+  <%= yield %>
+</div>
diff --git a/actiontext/app/views/action_text/content/_layout.html.erb b/actiontext/app/views/action_text/content/_layout.html.erb
new file mode 100644
index 0000000000..55cb708ac4
--- /dev/null
+++ b/actiontext/app/views/action_text/content/_layout.html.erb
@@ -0,0 +1,3 @@
+<div class="trix-content">
+  <%= render_action_text_content(content) %>
+</div>
diff --git a/actiontext/app/views/active_storage/blobs/_blob.html.erb b/actiontext/app/views/active_storage/blobs/_blob.html.erb
new file mode 100644
index 0000000000..049f57e804
--- /dev/null
+++ b/actiontext/app/views/active_storage/blobs/_blob.html.erb
@@ -0,0 +1,14 @@
+<figure class="attachment attachment--<%= blob.representable? ? "preview" : "file" %> attachment--<%= blob.filename.extension %>">
+  <% if blob.representable? %>
+    <%= image_tag blob.representation(resize_to_fit: local_assigns[:in_gallery] ? [ 800, 600 ] : [ 1024, 768 ]) %>
+  <% end %>
+
+  <figcaption class="attachment__caption">
+    <% if caption = blob.try(:caption) %>
+      <%= caption %>
+    <% else %>
+      <span class="attachment__name"><%= blob.filename %></span>
+      <span class="attachment__size"><%= number_to_human_size blob.byte_size %></span>
+    <% end %>
+  </figcaption>
+</figure>