88 lines
3 KiB
Ruby
88 lines
3 KiB
Ruby
module Banzai
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# Class for rendering multiple objects (e.g. Note instances) in a single pass,
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# using +render_field+ to benefit from caching in the database. Rendering and
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# redaction are both performed.
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#
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# The unredacted HTML is generated according to the usual +render_field+
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# policy, so specify the pipeline and any other context options on the model.
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#
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# The *redacted* (i.e., suitable for use) HTML is placed in an attribute
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# named "redacted_<foo>", where <foo> is the name of the cache field for the
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# chosen attribute.
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#
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# As an example, rendering the attribute `note` would place the unredacted
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# HTML into `note_html` and the redacted HTML into `redacted_note_html`.
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class ObjectRenderer
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attr_reader :project, :user
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# project - A Project to use for redacting Markdown.
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# user - The user viewing the Markdown/HTML documents, if any.
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# context - A Hash containing extra attributes to use during redaction
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def initialize(project, user = nil, redaction_context = {})
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@project = project
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@user = user
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@redaction_context = redaction_context
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end
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# Renders and redacts an Array of objects.
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#
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# objects - The objects to render.
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# attribute - The attribute containing the raw Markdown to render.
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#
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# Returns the same input objects.
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def render(objects, attribute)
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documents = render_documents(objects, attribute)
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documents = post_process_documents(documents, objects, attribute)
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redacted = redact_documents(documents)
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objects.each_with_index do |object, index|
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redacted_data = redacted[index]
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object.__send__("redacted_#{attribute}_html=", redacted_data[:document].to_html.html_safe)
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object.user_visible_reference_count = redacted_data[:visible_reference_count]
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end
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end
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private
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def render_documents(objects, attribute)
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pipeline = HTML::Pipeline.new([])
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objects.map do |object|
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pipeline.to_document(Banzai.render_field(object, attribute))
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end
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end
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def post_process_documents(documents, objects, attribute)
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# Called here to populate cache, refer to IssuableExtractor docs
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IssuableExtractor.new(project, user).extract(documents)
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documents.zip(objects).map do |document, object|
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context = context_for(object, attribute)
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Banzai::Pipeline[:post_process].to_document(document, context)
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end
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end
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# Redacts the list of documents.
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#
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# Returns an Array containing the redacted documents.
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def redact_documents(documents)
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redactor = Redactor.new(project, user)
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redactor.redact(documents)
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end
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# Returns a Banzai context for the given object and attribute.
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def context_for(object, attribute)
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base_context.merge(object.banzai_render_context(attribute))
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end
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def base_context
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@base_context ||= @redaction_context.merge(
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current_user: user,
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project: project,
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skip_redaction: true
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)
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end
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end
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end
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