gitlab-org--gitlab-foss/app/services/system_note_service.rb

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# SystemNoteService
#
# Used for creating system notes (e.g., when a user references a merge request
# from an issue, an issue's assignee changes, an issue is closed, etc.)
class SystemNoteService
# Called when commits are added to a Merge Request
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# new_commits - Array of Commits added since last push
# existing_commits - Array of Commits added in a previous push
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# oldrev - Optional String SHA of a previous Commit
#
# See new_commit_summary and existing_commit_summary.
#
# Returns the created Note object
def self.add_commits(noteable, project, author, new_commits, existing_commits = [], oldrev = nil)
total_count = new_commits.length + existing_commits.length
commits_text = "#{total_count} commit".pluralize(total_count)
body = "Added #{commits_text}:\n\n"
body << existing_commit_summary(noteable, existing_commits, oldrev)
body << new_commit_summary(new_commits).join("\n")
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when the assignee of a Noteable is changed or removed
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# assignee - User being assigned, or nil
#
# Example Note text:
#
# "Assignee removed"
#
# "Reassigned to @rspeicher"
#
# Returns the created Note object
def self.change_assignee(noteable, project, author, assignee)
body = assignee.nil? ? 'Assignee removed' : "Reassigned to @#{assignee.username}"
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when one or more labels on a Noteable are added and/or removed
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# added_labels - Array of Labels added
# removed_labels - Array of Labels removed
#
# Example Note text:
#
# "Added ~1 and removed ~2 ~3 labels"
#
# "Added ~4 label"
#
# "Removed ~5 label"
#
# Returns the created Note object
def self.change_label(noteable, project, author, added_labels, removed_labels)
labels_count = added_labels.count + removed_labels.count
references = ->(label) { "~#{label.id}" }
added_labels = added_labels.map(&references).join(' ')
removed_labels = removed_labels.map(&references).join(' ')
body = ''
if added_labels.present?
body << "added #{added_labels}"
body << ' and ' if removed_labels.present?
end
if removed_labels.present?
body << "removed #{removed_labels}"
end
body << ' ' << 'label'.pluralize(labels_count)
body = "#{body.capitalize}"
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when the milestone of a Noteable is changed
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# milestone - Milestone being assigned, or nil
#
# Example Note text:
#
# "Milestone removed"
#
# "Miletone changed to 7.11"
#
# Returns the created Note object
def self.change_milestone(noteable, project, author, milestone)
body = 'Milestone '
body += milestone.nil? ? 'removed' : "changed to #{milestone.title}"
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when the status of a Noteable is changed
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# status - String status
# source - Mentionable performing the change, or nil
#
# Example Note text:
#
# "Status changed to merged"
#
# "Status changed to closed by bc17db76"
#
# Returns the created Note object
def self.change_status(noteable, project, author, status, source)
body = "Status changed to #{status}"
body += " by #{source.gfm_reference}" if source
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when the title of a Noteable is changed
#
# noteable - Noteable object that responds to `title`
# project - Project owning noteable
# author - User performing the change
# old_title - Previous String title
#
# Example Note text:
#
# "Title changed from **Old** to **New**"
#
# Returns the created Note object
def self.change_title(noteable, project, author, old_title)
return unless noteable.respond_to?(:title)
body = "Title changed from **#{old_title}** to **#{noteable.title}**"
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when a branch in Noteable is changed
#
# noteable - Noteable object
# project - Project owning noteable
# author - User performing the change
# branch_type - 'source' or 'target'
# old_branch - old branch name
# new_branch - new branch nmae
#
# Example Note text:
#
# "Target branch changed from `Old` to `New`"
#
# Returns the created Note object
def self.change_branch(noteable, project, author, branch_type, old_branch, new_branch)
body = "#{branch_type} branch changed from `#{old_branch}` to `#{new_branch}`".capitalize
create_note(noteable: noteable, project: project, author: author, note: body)
end
# Called when a Mentionable references a Noteable
#
# noteable - Noteable object being referenced
# mentioner - Mentionable object
# author - User performing the reference
#
# Example Note text:
#
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# "mentioned in #1"
#
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# "mentioned in !2"
#
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# "mentioned in 54f7727c"
#
# See cross_reference_note_content.
#
# Returns the created Note object
def self.cross_reference(noteable, mentioner, author)
return if cross_reference_disallowed?(noteable, mentioner)
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gfm_reference = mentioner.gfm_reference(noteable.project)
note_options = {
project: noteable.project,
author: author,
note: cross_reference_note_content(gfm_reference)
}
if noteable.kind_of?(Commit)
note_options.merge!(noteable_type: 'Commit', commit_id: noteable.id)
else
note_options.merge!(noteable: noteable)
end
create_note(note_options)
end
def self.cross_reference?(note_text)
note_text.start_with?(cross_reference_note_prefix)
end
# Check if a cross-reference is disallowed
#
# This method prevents adding a "mentioned in !1" note on every single commit
# in a merge request. Additionally, it prevents the creation of references to
# external issues (which would fail).
#
# noteable - Noteable object being referenced
# mentioner - Mentionable object
#
# Returns Boolean
def self.cross_reference_disallowed?(noteable, mentioner)
return true if noteable.is_a?(ExternalIssue)
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return false unless mentioner.is_a?(MergeRequest)
return false unless noteable.is_a?(Commit)
mentioner.commits.include?(noteable)
end
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# Check if a cross reference to a noteable from a mentioner already exists
#
# This method is used to prevent multiple notes being created for a mention
# when a issue is updated, for example.
#
# noteable - Noteable object being referenced
# mentioner - Mentionable object
#
# Returns Boolean
def self.cross_reference_exists?(noteable, mentioner)
# Initial scope should be system notes of this noteable type
notes = Note.system.where(noteable_type: noteable.class)
if noteable.is_a?(Commit)
# Commits have non-integer IDs, so they're stored in `commit_id`
notes = notes.where(commit_id: noteable.id)
else
notes = notes.where(noteable_id: noteable.id)
end
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gfm_reference = mentioner.gfm_reference(noteable.project)
notes = notes.where(note: cross_reference_note_content(gfm_reference))
notes.count > 0
end
private
def self.create_note(args = {})
Note.create(args.merge(system: true))
end
def self.cross_reference_note_prefix
'mentioned in '
end
def self.cross_reference_note_content(gfm_reference)
"#{cross_reference_note_prefix}#{gfm_reference}"
end
# Build an Array of lines detailing each commit added in a merge request
#
# new_commits - Array of new Commit objects
#
# Returns an Array of Strings
def self.new_commit_summary(new_commits)
new_commits.collect do |commit|
"* #{commit.short_id} - #{commit.title}"
end
end
# Build a single line summarizing existing commits being added in a merge
# request
#
# noteable - MergeRequest object
# existing_commits - Array of existing Commit objects
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# oldrev - Optional String SHA of a previous Commit
#
# Examples:
#
# "* ea0f8418...2f4426b7 - 24 commits from branch `master`"
#
# "* ea0f8418..4188f0ea - 15 commits from branch `fork:master`"
#
# "* ea0f8418 - 1 commit from branch `feature`"
#
# Returns a newline-terminated String
def self.existing_commit_summary(noteable, existing_commits, oldrev = nil)
return '' if existing_commits.empty?
count = existing_commits.size
commit_ids = if count == 1
existing_commits.first.short_id
else
if oldrev
"#{Commit.truncate_sha(oldrev)}...#{existing_commits.last.short_id}"
else
"#{existing_commits.first.short_id}..#{existing_commits.last.short_id}"
end
end
commits_text = "#{count} commit".pluralize(count)
branch = noteable.target_branch
branch = "#{noteable.target_project_namespace}:#{branch}" if noteable.for_fork?
"* #{commit_ids} - #{commits_text} from branch `#{branch}`\n"
end
end