carbon/components/Editor.js

// Theirs
import url from 'url'
import React from 'react'
import domtoimage from 'dom-to-image'
import dynamic from 'next/dynamic'
import Dropzone from 'dropperx'

// Ours
import ApiContext from './ApiContext'
import Dropdown from './Dropdown'
import Settings from './Settings'
import Toolbar from './Toolbar'
import Overlay from './Overlay'
import Carbon from './Carbon'
import ExportMenu from './ExportMenu'
import Themes from './Themes'
import TweetButton from './TweetButton'
import {
  LANGUAGES,
  LANGUAGE_MIME_HASH,
  LANGUAGE_MODE_HASH,
  LANGUAGE_NAME_HASH,
  DEFAULT_EXPORT_SIZE,
  COLORS,
  EXPORT_SIZES_HASH,
  DEFAULT_CODE,
  DEFAULT_SETTINGS,
  DEFAULT_LANGUAGE,
  DEFAULT_PRESET_ID
} from '../lib/constants'
import { serializeState, getQueryStringState } from '../lib/routing'
import { getSettings, escapeHtml, unescapeHtml, formatCode, omit } from '../lib/util'
import LanguageIcon from './svg/Language'

const languageIcon = <LanguageIcon />

const BackgroundSelect = dynamic(() => import('./BackgroundSelect'), {
  loading: () => null
})

class Editor extends React.Component {
  static contextType = ApiContext
  constructor(props) {
    super(props)
    this.state = {
      ...DEFAULT_SETTINGS,
      preset: DEFAULT_PRESET_ID,
      loading: true
    }

    this.export = this.export.bind(this)
    this.upload = this.upload.bind(this)
    this.updateSetting = this.updateSetting.bind(this)
    this.updateTheme = this.updateTheme.bind(this)
    this.updateLanguage = this.updateLanguage.bind(this)
    this.updateBackground = this.updateBackground.bind(this)
    this.resetDefaultSettings = this.resetDefaultSettings.bind(this)
    this.getCarbonImage = this.getCarbonImage.bind(this)
    this.onDrop = this.onDrop.bind(this)
  }

  async componentDidMount() {
    const { asPath = '' } = this.props.router
    const { query, pathname } = url.parse(asPath, true)
    const path = escapeHtml(pathname.split('/').pop())
    const queryParams = getQueryStringState(query)
    let initialState = Object.keys(queryParams).length ? queryParams : {}
    try {
      // TODO fix this hack
      if (path.length >= 19 && path.indexOf('.') === -1 && this.context.gist) {
        const { code, language, config } = await this.context.gist.get(path)

        if (typeof config === 'object') {
          initialState = config
        }

        if (language) {
          initialState.language = language.toLowerCase()
        }

        initialState.code = code
      }
    } catch (e) {
      // eslint-disable-next-line
      console.log(e)
    }

    const newState = {
      // Load from localStorage
      ...getSettings(localStorage),
      // and then URL params
      ...initialState,
      loading: false
    }

    // Makes sure the slash in 'application/X' is decoded
    if (newState.language) {
      newState.language = unescapeHtml(newState.language)
    }

    this.updateState(newState)

    this.isSafari =
      window.navigator &&
      window.navigator.userAgent.indexOf('Safari') !== -1 &&
      window.navigator.userAgent.indexOf('Chrome') === -1
  }

  carbonNode = React.createRef()

  updateState = updates => this.setState(updates, () => this.props.onUpdate(this.state))

  updateCode = code => this.updateState({ code })
  updateAspectRatio = aspectRatio => this.updateState({ aspectRatio })

  async getCarbonImage(
    {
      format,
      type,
      squared = this.state.squaredImage,
      exportSize = (EXPORT_SIZES_HASH[this.state.exportSize] || DEFAULT_EXPORT_SIZE).value
    } = { format: 'png' }
  ) {
    // if safari, get image from api
    const isPNG = format !== 'svg'
    if (this.context.image && this.isSafari && isPNG) {
      const encodedState = serializeState(this.state)
      return this.context.image(encodedState)
    }

    const node = this.carbonNode.current

    const map = new Map()
    const undoMap = value => {
      map.forEach((value, node) => (node.innerText = value))
      return value
    }

    if (isPNG) {
      node.querySelectorAll('span[role="presentation"]').forEach(node => {
        if (node.innerText && node.innerText.match(/%[A-Za-z0-9]{2}/)) {
          map.set(node, node.innerText)
          node.innerText.match(/%[A-Za-z0-9]{2}/g).forEach(t => {
            node.innerText = node.innerText.replace(t, encodeURIComponent(t))
          })
        }
      })
    }

    const width = node.offsetWidth * exportSize
    const height = squared ? node.offsetWidth * exportSize : node.offsetHeight * exportSize

    const config = {
      style: {
        transform: `scale(${exportSize})`,
        'transform-origin': 'center',
        background: squared ? this.state.backgroundColor : 'none'
      },
      filter: n => {
        if (n.className) {
          return String(n.className).indexOf('eliminateOnRender') < 0
        }
        return true
      },
      width,
      height
    }

    // current font-family used
    const fontFamily = this.state.fontFamily
    try {
      if (type === 'blob') {
        if (format === 'svg') {
          return (
            domtoimage
              .toSvg(node, config)
              .then(dataUrl =>
                dataUrl
                  .replace(/&nbsp;/g, '&#160;')
                  // https://github.com/tsayen/dom-to-image/blob/fae625bce0970b3a039671ea7f338d05ecb3d0e8/src/dom-to-image.js#L551
                  .replace(/%23/g, '#')
                  .replace(/%0A/g, '\n')
                  // remove other fonts which are not used
                  .replace(
                    new RegExp('@font-face\\s+{\\s+font-family: (?!"*' + fontFamily + ').*?}', 'g'),
                    ''
                  )
              )
              // https://stackoverflow.com/questions/7604436/xmlparseentityref-no-name-warnings-while-loading-xml-into-a-php-file
              .then(dataUrl => dataUrl.replace(/&(?!#?[a-z0-9]+;)/g, '&amp;'))
              .then(uri => uri.slice(uri.indexOf(',') + 1))
              .then(data => new Blob([data], { type: 'image/svg+xml' }))
              .then(data => window.URL.createObjectURL(data))
          )
        }

        return await domtoimage.toBlob(node, config).then(blob => window.URL.createObjectURL(blob))
      }

      // Twitter needs regular dataurls
      return await domtoimage.toPng(node, config)
    } finally {
      undoMap()
    }
  }

  updateSetting(key, value) {
    this.updateState({ [key]: value })
    if (Object.prototype.hasOwnProperty.call(DEFAULT_SETTINGS, key)) {
      this.updateState({ preset: null })
    }
  }

  export(format = 'png') {
    const link = document.createElement('a')

    const prefix = this.state.filename || 'carbon'

    return this.getCarbonImage({ format, type: 'blob' }).then(url => {
      if (format !== 'open') {
        link.download = `${prefix}.${format}`
      }
      link.href = url
      document.body.appendChild(link)
      link.click()
      link.remove()
    })
  }

  resetDefaultSettings() {
    this.updateState({ ...DEFAULT_SETTINGS, preset: DEFAULT_PRESET_ID })
    this.props.onReset()
  }

  upload() {
    this.getCarbonImage({ format: 'png' }).then(
      this.context.tweet.bind(null, this.state.code || DEFAULT_CODE)
    )
  }

  onDrop([file]) {
    if (isImage(file)) {
      this.updateState({
        backgroundImage: file.content,
        backgroundImageSelection: null,
        backgroundMode: 'image',
        preset: null
      })
    } else {
      this.updateState({ code: file.content, language: 'auto' })
    }
  }

  updateTheme(theme) {
    this.updateSetting('theme', theme)
  }

  updateLanguage(language) {
    this.updateSetting('language', language.mime || language.mode)
  }

  updateBackground({ photographer, ...changes } = {}) {
    if (this.isSafari) {
      this.disablePNG = !verifyPayloadSize(changes.backgroundImage)
    }

    if (photographer) {
      this.updateState(({ code = DEFAULT_CODE }) => ({
        ...changes,
        code: code + `\n\n// Photo by ${photographer.name} on Unsplash`,
        preset: null
      }))
    } else {
      this.updateState({ ...changes, preset: null })
    }
  }

  format = () =>
    formatCode(this.state.code)
      .then(this.updateCode)
      .catch(() => {
        // create toast here in the future
      })

  applyPreset = ({ id: preset, ...settings }) => this.updateState({ preset, ...settings })

  render() {
    const {
      theme,
      language,
      backgroundColor,
      backgroundImage,
      backgroundMode,
      aspectRatio,
      code,
      exportSize
    } = this.state

    const config = omit(this.state, ['code', 'aspectRatio'])

    return (
      <div className="editor">
        <Toolbar>
          <Themes key={theme} updateTheme={this.updateTheme} theme={theme} />
          <Dropdown
            icon={languageIcon}
            selected={
              LANGUAGE_NAME_HASH[language] ||
              LANGUAGE_MIME_HASH[language] ||
              LANGUAGE_MODE_HASH[language] ||
              LANGUAGE_MODE_HASH[DEFAULT_LANGUAGE]
            }
            list={LANGUAGES}
            onChange={this.updateLanguage}
          />
          <BackgroundSelect
            onChange={this.updateBackground}
            mode={backgroundMode}
            color={backgroundColor}
            image={backgroundImage}
            aspectRatio={aspectRatio}
          />
          <Settings
            {...config}
            onChange={this.updateSetting}
            resetDefaultSettings={this.resetDefaultSettings}
            format={this.format}
            applyPreset={this.applyPreset}
            getCarbonImage={this.getCarbonImage}
          />
          <div className="buttons">
            <TweetButton onClick={this.upload} />
            <ExportMenu
              onChange={this.updateSetting}
              export={this.export}
              exportSize={exportSize}
              disablePNG={this.disablePNG}
            />
          </div>
        </Toolbar>

        <Dropzone accept="image/*, text/*, application/*" onDrop={this.onDrop}>
          {({ canDrop }) => (
            <Overlay
              isOver={canDrop}
              title={`Drop your file here to import ${canDrop ? '✋' : '✊'}`}
            >
              {/*key ensures Carbon's internal language state is updated when it's changed by Dropdown*/}
              <Carbon
                key={language}
                ref={this.carbonNode}
                config={this.state}
                onChange={this.updateCode}
                onAspectRatioChange={this.updateAspectRatio}
                loading={this.state.loading}
              >
                {code != null ? code : DEFAULT_CODE}
              </Carbon>
            </Overlay>
          )}
        </Dropzone>
        <style jsx>
          {`
            .editor {
              background: ${COLORS.BLACK};
              border: 3px solid ${COLORS.SECONDARY};
              border-radius: 8px;
              padding: 16px;
            }

            .buttons {
              display: flex;
              margin-left: auto;
            }
          `}
        </style>
      </div>
    )
  }
}

const MAX_PAYLOAD_SIZE = 5e6 // bytes
function verifyPayloadSize(str) {
  if (typeof str !== 'string') return true

  return new Blob([str]).size < MAX_PAYLOAD_SIZE
}

function isImage(file) {
  return file.type.split('/')[0] === 'image'
}

Editor.defaultProps = {
  onUpdate: () => {},
  onReset: () => {}
}

export default Editor