forgeplus/app/controllers/compare_controller.rb

class CompareController < ApplicationController
  # skip_before_action :require_login
  before_action :load_repository

  def index
  end

  def show
    load_compare_params
    compare
    @merge_status, @merge_message = get_merge_message
    @page_size = page_size <= 0 ? 1 : page_size
    @page_limit = page_limit <=0 ? 15 : page_limit
    @page_offset = (@page_size -1) * @page_limit
    Rails.logger.info("+========#{@page_size}-#{@page_limit}-#{@page_offset}")
  end

  private
  def get_merge_message 
    if @base.blank? || @head.blank?
      return -2, "请选择分支"
    else
      return -2, "目标仓库未开启合并请求（PR）功能" unless @project.has_menu_permission("pulls")
      if @head.include?(":")
        fork_project = @project.forked_projects.joins(:owner).where(users: {login: @head.to_s.split("/")[0]}).take
        return -2, "请选择正确的仓库" unless fork_project.present?
        @exist_pullrequest = @project.pull_requests.where(is_original: true, head: @head.to_s.split(":")[1], base: @base, status: 0, fork_project_id: fork_project.id).take
      else 
        @exist_pullrequest = @project.pull_requests.where(is_original: false, head: @base, base: @head, status: 0).take
      end
      if @exist_pullrequest.present?
        return -2, "在这些分支之间的合并请求已存在：<a href='/#{@owner.login}/#{@project.identifier}/pulls/#{@exist_pullrequest.id}'>#{@exist_pullrequest.try(:title)}</a>"
      else 
        if @compare_result["Commits"].blank? && @compare_result["Diff"].blank?
          return -2, "分支内容相同，无需创建合并请求"
        end
      end
    end
    return 0, "可以合并"
  end

  def compare

    # TODO: 处理fork的项目向源项目发送PR的base、head参数问题
    @compare_result ||=
      @head.include?(":") ? gitea_compare(@base, @head) : gitea_compare(@head, @base)
  end

  def load_compare_params
    # @base = Addressable::URI.unescape(params[:base])
    @base = params[:base].include?(":") ? Addressable::URI.unescape(params[:base].split(":")[0]) + ':' + Base64.decode64(params[:base].split(":")[1]) : Base64.decode64(params[:base])
    @head = params[:head].include?('.json') ? params[:head][0..-6] : params[:head]
    # @head = Addressable::URI.unescape(@head)
    @head = @head.include?(":") ? Addressable::URI.unescape(@head.split(":")[0]) + ':' + Base64.decode64(@head.split(":")[1]) : Base64.decode64(@head)
  end

  def gitea_compare(base, head)
    Gitea::Repository::Commits::CompareService.call(@owner.login, @project.identifier, Addressable::URI.escape(base), Addressable::URI.escape(head), current_user.gitea_token)
  end

  def page_size 
    params.fetch(:page, 1).to_i
  end

  def page_limit
    params.fetch(:limit, 15).to_i
  end
end