proginn-frontend/kaifain_v2/helpers/seoHelper.ts

import { randomRange, log10 } from '../utils/misc'
import murmurhash from 'murmurhash'

export const genDocumentHeadData = (input: {
  ctx: any
  catName?: string
}) => {
  const { ctx, catName } = input || {}
  const canonical: string = process.server ? `https://${ctx.req.headers.host}${ctx.req.url}` : location && location.href
  let title: string
  let keywords: string
  let descrption: string

  if (catName) {
    title = `${catName} 软件、网站、APP、小程序开发及SaaS、PaaS、IaaS、API服务平台-开发屋`
    keywords = `${catName}软件开发,${catName}APP开发,${catName}小程序开发,${catName}SaaS服务商`
    descrption = `开发屋为${catName}中小型企业企业提供各行业软件、APP、小程序开发服务，并整合开发项目所需的各种SaaS、PaaS,LaaS以及API服务商供选择，全程解决开发需求！`
  } else {
    title = '开发屋-提供网站建设、APP软件、小程序开发及SaaS、PasS、IaaS服务'
    keywords = '网站开发, 软件APP开发, SaaS, PaaS'
    descrption = '开发屋为企业提供行业内领先的技术解决方案，包括行业定制化SaaS、PasS、API数据接口服务以及技术组织，保障企业在降低人力开发成本的同时，得到优质的项目开发实力。'
  }

  return {
    title,
    keywords,
    descrption,
    canonical
  }
}

const scoreSubCatItem = ({path, topCatId, subCatId}) => {
  const uni = murmurhash.v3(path)
  const isRoot = path === '/'

  return (item: any, idx: number) => {
    let score = 0

    if (topCatId && item.parent_id === topCatId) {
      score += 100
    }

    if (subCatId && item.cat_id === subCatId) {
      score -= 100
    }

    if (!isRoot && !score) {
      score += log10(Math.abs(uni - murmurhash.v3(item.cat_id)))
    }

    return Object.assign({}, item, {
      _score: score
    })
  }
}

const genFooterLinkItem = (name: string, hashId: string) => {
  return {
    name: `${name}技术开发`,
    url: `/c/${hashId}`
  }
}

export const genDocumentFooterData = (input: {
  ctx: any
  classes: any[]
  topCatId?: string
  subCatId?: string
}) => {
  const { ctx, classes, topCatId, subCatId } = input || {}
  const host = (process.server ? ctx.req.headers.host : location.host) || ''
  const path = process.server ? ctx.req.url : location.pathname || '/'
  const baseLink = host && host.indexOf('local') > -1 ? `http://${host}` : `https://${host}`
  const link = [{
    name: '热门领域技术解决方案',
    data: classes.map(topCat => genFooterLinkItem(topCat.name, topCat.hash_id))
  }, {
    name: '细分领域技术解决方案',
    data: classes
      .flatMap(topCat => topCat.categories || [])
      .map(scoreSubCatItem({path, topCatId, subCatId}))
      .sort((a, b) => b._score - a._score)
      .slice(0, randomRange(20, 30))
      .map(cat => genFooterLinkItem(cat.name, cat.cat_id))
  }]

  return {
    baseLink,
    link
  }
}