不重复 url 生成

generate_slug

/**
 * Copyright (c) 2014 Meizu bigertech, All rights reserved.
 * http://www.bigertech.com/
 * @author liuxing
 * @date  15/3/19
 * @description
 *
 */
var unidecode = require('unidecode');

var safeString = function (string) {
  string = string.trim();

  // Remove non ascii characters
  string = unidecode(string)+'';
  // Remove URL reserved chars: `:/?#[]@!$&'()*+,;=` as well as `\%<>|^~£"`
  string = string
    .replace(/[:\/\?#\[\]@!$&'()*+,;=\\%<>\|\^~£"]/g, '')
    // Replace dots and spaces with a dash
    .replace(/(\s|\.)/g, '-')
    // Convert 2 or more dashes into a single dash
    .replace(/-+/g, '-')
    // Make the whole thing lowercase
    .toLowerCase();

  return string;
}

/**
 * 更具模型生成域名，
 * @param Model 模型
 * @param title 标题或者name
 */
var generateSlug = function (Model, title) {
  var slug,
      slugTryCount = 1,
      // Look for a matching slug, append an incrementing number if so
      checkIfSlugExists, longSlug;

  checkIfSlugExists = function (slugToFind) {
    var args = {domain: slugToFind};
    slugToFind;
    return Model.findOne()
      .where(args)
      .then(function (found) {
        var trimSpace;
        if (!found) {
          return slugToFind;
        }

        slugTryCount += 1;

        // If we shortened, go back to the full version and try again
        if (slugTryCount === 2 && longSlug) {
          slugToFind = longSlug;
          longSlug = null;
          slugTryCount = 1;
          return checkIfSlugExists(slugToFind);
        }

        // If this is the first time through, add the hyphen
        if (slugTryCount === 2) {
          slugToFind += '-';
        } else {
          // Otherwise, trim the number off the end
          trimSpace = -(String(slugTryCount - 1).length);
          slugToFind = slugToFind.slice(0, trimSpace);
        }

        slugToFind += slugTryCount;

        return checkIfSlugExists(slugToFind);
      });
  };

  slug = safeString(title);

  // Remove trailing hyphen
  slug = slug.charAt(slug.length - 1) === '-' ? slug.substr(0, slug.length - 1) : slug;

  // Test for duplicate slugs.
  return checkIfSlugExists(slug);
}

module.exports = {
  generateSlug: generateSlug
}

safe_string

    safeString: function (string) {
        string = string.trim();

        // Remove non ascii characters
        string = unidecode(string);

        // Remove URL reserved chars: `:/?#[]@!$&'()*+,;=` as well as `\%<>|^~£"`
        string = string.replace(/[:\/\?#\[\]@!$&'()*+,;=\\%<>\|\^~£"]/g, '')
            // Replace dots and spaces with a dash
            .replace(/(\s|\.)/g, '-')
            // Convert 2 or more dashes into a single dash
            .replace(/-+/g, '-')
            // Make the whole thing lowercase
            .toLowerCase();

        return string;
    },