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{ Meteor } from \"meteor/meteor\";\nimport \"./server-register.js\";\n\nconst startupPromise = new Promise(Meteor.startup);\nconst pageLoadCallbacks = new Set;\n\nexport function onPageLoad(callback) {\n  if (typeof callback === \"function\") {\n    pageLoadCallbacks.add(callback);\n  }\n\n  // Return the callback so that it can be more easily removed later.\n  return callback;\n}\n\nonPageLoad.remove = function (callback) {\n  pageLoadCallbacks.delete(callback);\n};\n\nonPageLoad.clear = function () {\n  pageLoadCallbacks.clear();\n};\n\nonPageLoad.chain = function (handler) {\n  return startupPromise.then(() => {\n    let promise = Promise.resolve();\n    pageLoadCallbacks.forEach(callback => {\n      promise = promise.then(() => handler(callback));\n    });\n    return promise;\n  });\n};\n","import { WebAppInternals } from \"meteor/webapp\";\nimport MagicString from \"magic-string\";\nimport { SAXParser } from \"parse5\";\nimport { create as createStream } from \"combined-stream2\";\nimport { ServerSink } from \"./server-sink.js\";\nimport { onPageLoad } from \"./server.js\";\n\nWebAppInternals.registerBoilerplateDataCallback(\n  \"meteor/server-render\",\n  (request, data, arch) => {\n    const sink = new ServerSink(request, arch);\n\n    return onPageLoad.chain(\n      callback => callback(sink, request)\n    ).then(() => {\n      if (! sink.maybeMadeChanges) {\n        return false;\n      }\n\n      let reallyMadeChanges = false;\n\n      function rewrite(property) {\n        const html = data[property];\n        if (typeof html !== \"string\") {\n          return;\n        }\n\n        const magic = new MagicString(html);\n        const parser = new SAXParser({\n          locationInfo: true\n        });\n\n        data[property] = parser;\n\n        if (Object.keys(sink.htmlById).length) {\n          const stream = createStream();\n\n          let lastStart = magic.start;\n          parser.on(\"startTag\", (name, attrs, selfClosing, loc) => {\n            attrs.some(attr => {\n              if (attr.name === \"id\") {\n                let html = sink.htmlById[attr.value];\n                if (html) {\n                  reallyMadeChanges = true;\n                  const start = magic.slice(lastStart, loc.endOffset);\n                  stream.append(Buffer.from(start, \"utf8\"));\n                  stream.append(\n                    typeof html === \"string\"\n                      ? Buffer.from(html, \"utf8\")\n                      : html\n                  );\n                  lastStart = loc.endOffset;\n                }\n                return true;\n              }\n            });\n          });\n\n          parser.on(\"endTag\", (name, location) => {\n            if (location.endOffset === html.length) {\n              // reached the end of the template\n              const end = magic.slice(lastStart);\n              stream.append(Buffer.from(end, \"utf8\"));\n            }\n          });\n\n          data[property] = stream;\n        }\n\n        parser.write(html, parser.end.bind(parser));\n      }\n\n      if (sink.head) {\n        data.dynamicHead = (data.dynamicHead || \"\") + sink.head;\n        reallyMadeChanges = true;\n      }\n\n      if (Object.keys(sink.htmlById).length > 0) {\n        // We don't currently allow injecting HTML into the <head> except\n        // by calling sink.appendHead(html).\n        rewrite(\"body\");\n        rewrite(\"dynamicBody\");\n      }\n\n      if (sink.body) {\n        data.dynamicBody = (data.dynamicBody || \"\") + sink.body;\n        reallyMadeChanges = true;\n      }\n\n      if (sink.statusCode) {\n        data.statusCode = sink.statusCode;\n        reallyMadeChanges = true;\n      }\n\n      if (Object.keys(sink.responseHeaders)){\n        data.headers = sink.responseHeaders;\n        reallyMadeChanges = true;\n      }\n\n      return reallyMadeChanges;\n    });\n  }\n);\n","export class ServerSink {\n  constructor(request, arch) {\n    this.request = request;\n    this.arch = arch;\n    this.head = \"\";\n    this.body = \"\";\n    this.htmlById = Object.create(null);\n    this.maybeMadeChanges = false;\n    this.statusCode = null;\n    this.responseHeaders = {};\n  }\n\n  appendToHead(html) {\n    if (appendContent(this, \"head\", html)) {\n      this.maybeMadeChanges = true;\n    }\n  }\n\n  appendToBody(html) {\n    if (appendContent(this, \"body\", html)) {\n      this.maybeMadeChanges = true;\n    }\n  }\n\n  appendToElementById(id, html) {\n    if (appendContent(this.htmlById, id, html)) {\n      this.maybeMadeChanges = true;\n    }\n  }\n\n  renderIntoElementById(id, html) {\n    this.htmlById[id] = \"\";\n    this.appendToElementById(id, html);\n  }\n\n  redirect(location, code = 301) {\n    this.maybeMadeChanges = true;\n    this.statusCode = code;\n    this.responseHeaders.Location = location;\n  }\n\n  // server only methods\n  setStatusCode(code) {\n    this.maybeMadeChanges = true;\n    this.statusCode = code;\n  }\n\n  setHeader(key, value) {\n    this.maybeMadeChanges = true;\n    this.responseHeaders[key] = value;\n  }\n\n  getHeaders() {\n    return this.request.headers;\n  }\n\n  getCookies() {\n    return this.request.cookies;\n  }\n}\n\nexport function isReadable(stream) {\n  return (\n    stream !== null &&\n    typeof stream === 'object' &&\n    typeof stream.pipe === 'function' &&\n    stream.readable !== false &&\n    typeof stream._read === 'function' &&\n    typeof stream._readableState === 'object'\n  );\n}\n\nfunction appendContent(object, property, content) {\n  let madeChanges = false;\n\n  if (Array.isArray(content)) {\n    content.forEach(elem => {\n      if (appendContent(object, property, elem)) {\n        madeChanges = true;\n      }\n    });\n  } else if (isReadable(content)) {\n    object[property] = content;\n    madeChanges = true;\n  } else if ((content = content && content.toString(\"utf8\"))) {\n    object[property] = (object[property] || \"\") + content;\n    madeChanges = true;\n  } \n  return madeChanges;\n}\n"]}