next-csrf/example/.next/cache/next-babel-loader/77025dfb15c93e4c87bdd8070b903fb4.json

CSRF mitigation library for Next.js

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DOMAttributeNames: Record<string, string> = {\n  acceptCharset: 'accept-charset',\n  className: 'class',\n  htmlFor: 'for',\n  httpEquiv: 'http-equiv',\n}\n\nfunction reactElementToDOM({ type, props }: JSX.Element): HTMLElement {\n  const el = document.createElement(type)\n  for (const p in props) {\n    if (!props.hasOwnProperty(p)) continue\n    if (p === 'children' || p === 'dangerouslySetInnerHTML') continue\n\n    // we don't render undefined props to the DOM\n    if (props[p] === undefined) continue\n\n    const attr = DOMAttributeNames[p] || p.toLowerCase()\n    el.setAttribute(attr, props[p])\n  }\n\n  const { children, dangerouslySetInnerHTML } = props\n  if (dangerouslySetInnerHTML) {\n    el.innerHTML = dangerouslySetInnerHTML.__html || ''\n  } else if (children) {\n    el.textContent = typeof children === 'string' ? children : children.join('')\n  }\n  return el\n}\n\nfunction updateElements(type: string, components: JSX.Element[]) {\n  const headEl = document.getElementsByTagName('head')[0]\n  const headCountEl: HTMLMetaElement = headEl.querySelector(\n    'meta[name=next-head-count]'\n  ) as HTMLMetaElement\n  if (process.env.NODE_ENV !== 'production') {\n    if (!headCountEl) {\n      console.error(\n        'Warning: next-head-count is missing. https://err.sh/next.js/next-head-count-missing'\n      )\n      return\n    }\n  }\n\n  const headCount = Number(headCountEl.content)\n  const oldTags: Element[] = []\n\n  for (\n    let i = 0, j = headCountEl.previousElementSibling;\n    i < headCount;\n    i++, j = j!.previousElementSibling\n  ) {\n    if (j!.tagName.toLowerCase() === type) {\n      oldTags.push(j!)\n    }\n  }\n  const newTags = (components.map(reactElementToDOM) as HTMLElement[]).filter(\n    (newTag) => {\n      for (let k = 0, len = oldTags.length; k < len; k++) {\n        const oldTag = oldTags[k]\n        if (oldTag.isEqualNode(newTag)) {\n          oldTags.splice(k, 1)\n          return false\n        }\n      }\n      return true\n    }\n  )\n\n  oldTags.forEach((t) => t.parentNode!.removeChild(t))\n  newTags.forEach((t) => headEl.insertBefore(t, headCountEl))\n  headCountEl.content = (headCount - oldTags.length + newTags.length).toString()\n}\n\nexport default function initHeadManager() {\n  let updatePromise: Promise<void> | null = null\n\n  return {\n    mountedInstances: new Set(),\n    updateHead: (head: JSX.Element[]) => {\n      const promise = (updatePromise = Promise.resolve().then(() => {\n        if (promise !== updatePromise) return\n\n        updatePromise = null\n        const tags: Record<string, JSX.Element[]> = {}\n\n        head.forEach((h) => {\n          const components = tags[h.type] || []\n          components.push(h)\n          tags[h.type] = components\n        })\n\n        const titleComponent = tags.title ? tags.title[0] : null\n        let title = ''\n        if (titleComponent) {\n          const { children } = titleComponent.props\n          title = typeof children === 'string' ? children : children.join('')\n        }\n        if (title !== document.title) document.title = title\n        ;['meta', 'base', 'link', 'style', 'script'].forEach((type) => {\n          updateElements(type, tags[type] || [])\n        })\n      }))\n    },\n  }\n}\n"]},"metadata":{},"sourceType":"script"}