blockstack/src/profiles/services/hackerNews.ts

The Blockstack Javascript library for authentication, identity, and storage.

import { Service, CheerioModuleType } from './service'
import { AccountProofInfo } from '../profileProofs'

class HackerNews extends Service {
  getBaseUrls() {
    const baseUrls = [
      'https://news.ycombinator.com/user?id=',
      'http://news.ycombinator.com/user?id=',
      'news.ycombinator.com/user?id='
    ]
    return baseUrls
  }

  getProofUrl(proof: AccountProofInfo) {
    const baseUrls = this.getBaseUrls()

    const proofUrl = super.prefixScheme(proof.proof_url)

    for (let i = 0; i < baseUrls.length; i++) {
      if (proofUrl === `${baseUrls[i]}${proof.identifier}`) {
        return proofUrl
      }
    }
    throw new Error(`Proof url ${proof.proof_url} is not valid for service ${proof.service}`)
  }

  normalizeUrl(_proof: AccountProofInfo) {
    return ''
  }

  getProofStatement(searchText: string, cheerio: CheerioModuleType) {
    const $ = cheerio.load(searchText)
    const tables = $('#hnmain').children().find('table')
    let statement = ''

    if (tables.length > 0) {
      tables.each((tableIndex, table) => {
        const rows = $(table).find('tr')

        if (rows.length > 0) {
          rows.each((idx, row) => {
            const heading = $(row).find('td')
              .first()
              .text()
              .trim()

            if (heading === 'about:') {
              statement = $(row).find('td')
                .last()
                .text()
                .trim()
            }
          })
        }
      })
    }

    return statement
  }
}

export { HackerNews }