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# frozen_string_literal: true
module Banzai
module Filter
# HTML filter that inserts a placeholder element for each
# reference to an alert dashboard.
class InlineAlertMetricsFilter < ::Banzai::Filter::InlineEmbedsFilter
include ::Gitlab::Routing
# Search params for selecting alert metrics links. A few
# simple checks is enough to boost performance without
# the cost of doing a full regex match.
def xpath_search
"descendant-or-self::a[contains(@href,'metrics_dashboard') and \
contains(@href,'prometheus/alerts') and \
starts-with(@href, '#{gitlab_domain}')]"
end
# Regular expression matching alert dashboard urls
def link_pattern
::Gitlab::Metrics::Dashboard::Url.alert_regex
end
private
# Endpoint FE should hit to collect the appropriate
# chart information
def metrics_dashboard_url(params)
metrics_dashboard_namespace_project_prometheus_alert_url(
params['namespace'],
params['project'],
params['alert'],
embedded: true,
format: :json,
**query_params(params['url'])
)
end
# Parses query params out from full url string into hash.
#
# Ex) 'https://<root>/<project>/metrics_dashboard?title=Title&group=Group'
# --> { title: 'Title', group: 'Group' }
def query_params(url)
::Gitlab::Metrics::Dashboard::Url.parse_query(url)
end
end
end
end
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