bandcamp-scraper/lib/utils.js

A scraper for https://bandcamp.com

function createQueryString (params) {
  return Object.keys(params).map(function (name) {
    return name + '=' + encodeURIComponent(params[name])
  }).join('&')
}

exports.generateSearchUrl = function (params) {
  if (!params || typeof params !== 'object') {
    throw new Error('Expect params to be an object.')
  }
  // required
  if (!Object.prototype.hasOwnProperty.call(params, 'query') || typeof params.query !== 'string') {
    throw new Error('Expect params to have string property named query.')
  }
  // optional
  if (Object.prototype.hasOwnProperty.call(params, 'page') && typeof params.page !== 'number') {
    throw new Error('Expect params named page to be type number.')
  }
  params = {
    q: params.query,
    page: params.page || 1
  }
  return 'https://bandcamp.com/search?' + createQueryString(params)
}

exports.generateTagUrl = function (params) {
  if (!params || typeof params !== 'object') {
    throw new Error('Expect params to be an object.')
  }
  // required
  if (!Object.prototype.hasOwnProperty.call(params, 'tag') || typeof params.tag !== 'string') {
    throw new Error('Expect params to have string property named tag.')
  }
  // optional
  if (Object.prototype.hasOwnProperty.call(params, 'page') && typeof params.page !== 'number') {
    throw new Error('Expect params named page to be type number.')
  }
  const tag = params.tag
  params = {
    page: params.page || 1
  }
  return 'https://bandcamp.com/tag/' + encodeURIComponent(tag) + '?' + createQueryString(params)
}