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module Gitlab
# Extract possible GFM references from an arbitrary String for further processing.
class ReferenceExtractor
attr_accessor :project, :current_user, :references
def initialize(project, current_user = nil)
@project = project
@current_user = current_user
end
def can?(user, action, subject)
Ability.abilities.allowed?(user, action, subject)
end
def analyze(text)
text = text.dup
# Remove preformatted/code blocks so that references are not included
text.gsub!(/^```.*?^```/m, '')
text.gsub!(/[^`]`[^`]*?`[^`]/, '')
@references = Hash.new { |hash, type| hash[type] = [] }
parse_references(text)
end
# Given a valid project, resolve the extracted identifiers of the requested type to
# model objects.
def users
references[:user].uniq.map do |project, identifier|
if identifier == "all"
project.team.members.flatten
elsif namespace = Namespace.find_by(path: identifier)
if namespace.is_a?(Group)
namespace.users if can?(current_user, :read_group, namespace)
else
namespace.owner
end
end
end.flatten.compact.uniq
end
def labels
references[:label].uniq.map do |project, identifier|
project.labels.where(id: identifier).first
end.compact.uniq
end
def issues
references[:issue].uniq.map do |project, identifier|
if project.default_issues_tracker?
project.issues.where(iid: identifier).first
end
end.compact.uniq
end
def merge_requests
references[:merge_request].uniq.map do |project, identifier|
project.merge_requests.where(iid: identifier).first
end.compact.uniq
end
def snippets
references[:snippet].uniq.map do |project, identifier|
project.snippets.where(id: identifier).first
end.compact.uniq
end
def commits
references[:commit].uniq.map do |project, identifier|
repo = project.repository
repo.commit(identifier) if repo
end.compact.uniq
end
def commit_ranges
references[:commit_range].uniq.map do |project, identifier|
repo = project.repository
if repo
from_id, to_id = identifier.split(/\.{2,3}/, 2)
[repo.commit(from_id), repo.commit(to_id)]
end
end.compact.uniq
end
private
NAME_STR = Gitlab::Regex::NAMESPACE_REGEX_STR
PROJ_STR = "(?<project>#{NAME_STR}/#{NAME_STR})"
REFERENCE_PATTERN = %r{
(?<prefix>\W)? # Prefix
( # Reference
@(?<user>#{NAME_STR}) # User name
|~(?<label>\d+) # Label ID
|(?<issue>([A-Z\-]+-)\d+) # JIRA Issue ID
|#{PROJ_STR}?\#(?<issue>([a-zA-Z\-]+-)?\d+) # Issue ID
|#{PROJ_STR}?!(?<merge_request>\d+) # MR ID
|\$(?<snippet>\d+) # Snippet ID
|(#{PROJ_STR}@)?(?<commit_range>[\h]{6,40}\.{2,3}[\h]{6,40}) # Commit range
|(#{PROJ_STR}@)?(?<commit>[\h]{6,40}) # Commit ID
)
(?<suffix>\W)? # Suffix
}x.freeze
TYPES = %i(user issue label merge_request snippet commit commit_range).freeze
def parse_references(text, project = @project)
# parse reference links
text.gsub!(REFERENCE_PATTERN) do |match|
type = TYPES.detect { |t| $~[t].present? }
actual_project = project
project_prefix = nil
project_path = $LAST_MATCH_INFO[:project]
if project_path
actual_project = ::Project.find_with_namespace(project_path)
actual_project = nil unless can?(current_user, :read_project, actual_project)
project_prefix = project_path
end
parse_result($LAST_MATCH_INFO, type,
actual_project, project_prefix) || match
end
end
# Called from #parse_references. Attempts to build a gitlab reference
# link. Returns nil if +type+ is nil, if the match string is an HTML
# entity, if the reference is invalid, or if the matched text includes an
# invalid project path.
def parse_result(match_info, type, project, project_prefix)
prefix = match_info[:prefix]
suffix = match_info[:suffix]
return nil if html_entity?(prefix, suffix) || type.nil?
return nil if project.nil? && !project_prefix.nil?
identifier = match_info[type]
ref_link = reference_link(type, identifier, project, project_prefix)
if ref_link
"#{prefix}#{ref_link}#{suffix}"
else
nil
end
end
# Return true if the +prefix+ and +suffix+ indicate that the matched string
# is an HTML entity like &
def html_entity?(prefix, suffix)
prefix && suffix && prefix[0] == '&' && suffix[-1] == ';'
end
def reference_link(type, identifier, project, _)
references[type] << [project, identifier]
end
end
end
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