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# frozen_string_literal: true
module Gitlab
module Pagination
class OffsetHeaderBuilder
attr_reader :request_context, :per_page, :page, :next_page, :prev_page, :total, :total_pages
delegate :params, :header, :request, to: :request_context
def initialize(request_context:, per_page:, page:, next_page:, prev_page: nil, total:, total_pages:)
@request_context = request_context
@per_page = per_page
@page = page
@next_page = next_page
@prev_page = prev_page
@total = total
@total_pages = total_pages
end
def execute(exclude_total_headers: false, data_without_counts: false)
header 'X-Per-Page', per_page.to_s
header 'X-Page', page.to_s
header 'X-Next-Page', next_page.to_s
header 'X-Prev-Page', prev_page.to_s
header 'Link', pagination_links(data_without_counts)
return if exclude_total_headers || data_without_counts
header 'X-Total', total.to_s
header 'X-Total-Pages', total_pages.to_s
end
private
def pagination_links(data_without_counts)
[].tap do |links|
links << %(<#{page_href(page: prev_page)}>; rel="prev") if prev_page
links << %(<#{page_href(page: next_page)}>; rel="next") if next_page
links << %(<#{page_href(page: 1)}>; rel="first")
links << %(<#{page_href(page: total_pages)}>; rel="last") unless data_without_counts
end.join(', ')
end
def base_request_uri
@base_request_uri ||= URI.parse(request.url).tap do |uri|
uri.host = Gitlab.config.gitlab.host
uri.port = Gitlab.config.gitlab.port
end
end
def build_page_url(query_params:)
base_request_uri.tap do |uri|
uri.query = query_params
end.to_s
end
def page_href(next_page_params = {})
query_params = params.merge(**next_page_params, per_page: params[:per_page]).to_query
build_page_url(query_params: query_params)
end
end
end
end
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