2019-05-06 11:31:26 +00:00
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---
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id: bd7158d8c443edefaeb5bd0f
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2021-02-16 21:01:20 +00:00
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title: 文件元数据微服务
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2019-05-06 11:31:26 +00:00
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challengeType: 4
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2020-09-17 16:11:18 +00:00
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forumTopicId: 301506
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2021-01-13 02:31:00 +00:00
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dashedName: file-metadata-microservice
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2019-05-06 11:31:26 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2019-05-06 11:31:26 +00:00
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2021-02-16 21:01:20 +00:00
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构建一个 JavaScript 的全栈应用,在功能上与这个应用相似:<https://file-metadata-microservice.freecodecamp.rocks/>。 可以采用下面的一种方式完成这个挑战:
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2019-05-06 11:31:26 +00:00
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2021-02-16 21:01:20 +00:00
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- 克隆 [this GitHub repo](https://github.com/freeCodeCamp/boilerplate-project-filemetadata/) 并在本地完成项目。
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2021-05-12 15:55:58 +00:00
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- 使用[我们的 Replit 初始化项目](https://replit.com/github/freeCodeCamp/boilerplate-project-filemetadata)来完成你的项目。
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2021-02-16 21:01:20 +00:00
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- 使用你选择的网站生成器来完成项目, 并确保包含了我们 GitHub 仓库的所有文件。
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2019-05-06 11:31:26 +00:00
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2021-02-16 21:01:20 +00:00
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当完成本项目,请确认有一个正常运行的 demo 可以公开访问。 然后将 URL 提交到 `Solution Link` 中。 此外,还可以将项目的源码提交到 `GitHub Link` 中。
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2021-02-06 04:42:36 +00:00
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# --instructions--
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2021-02-16 21:01:20 +00:00
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** 提示:** 可以使用 `multer` npm 包来处理上传文件
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2019-05-06 11:31:26 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2019-05-06 11:31:26 +00:00
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2021-02-16 21:01:20 +00:00
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提交自己的项目,而不是示例的 URL。
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2019-05-06 11:31:26 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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2021-02-06 04:42:36 +00:00
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(getUserInput) => {
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assert(
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!/.*\/file-metadata-microservice\.freecodecamp\.rocks/.test(
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getUserInput('url')
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)
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);
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};
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```
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2021-02-16 21:01:20 +00:00
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可以提交一个包含上传文件的表单。
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2019-05-06 11:31:26 +00:00
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2021-02-06 04:42:36 +00:00
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```js
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async (getUserInput) => {
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const site = await fetch(getUserInput('url'));
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const data = await site.text();
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const doc = new DOMParser().parseFromString(data, 'text/html');
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assert(doc.querySelector('input[type="file"]'));
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};
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2020-12-16 07:37:30 +00:00
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```
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2019-05-06 11:31:26 +00:00
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2021-02-16 21:01:20 +00:00
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表单的文件上传标签的 `name` 属性设置成 `upfile`。
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2019-05-06 11:31:26 +00:00
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```js
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2021-02-06 04:42:36 +00:00
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async (getUserInput) => {
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const site = await fetch(getUserInput('url'));
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const data = await site.text();
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const doc = new DOMParser().parseFromString(data, 'text/html');
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assert(doc.querySelector('input[name="upfile"]'));
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};
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```
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2020-12-16 07:37:30 +00:00
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2021-02-16 21:01:20 +00:00
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当提交一个文件时,在 JSON 响应中收到文件的 `name`、`type` 和`size`(以 bytes(字节)为单位)。
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2021-02-06 04:42:36 +00:00
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```js
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async (getUserInput) => {
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const formData = new FormData();
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const fileData = await fetch(
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'https://cdn.freecodecamp.org/weather-icons/01d.png'
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);
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const file = await fileData.blob();
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formData.append('upfile', file, 'icon');
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const data = await fetch(getUserInput('url') + '/api/fileanalyse', {
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method: 'POST',
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body: formData
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});
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const parsed = await data.json();
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assert.property(parsed, 'size');
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assert.equal(parsed.name, 'icon');
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assert.equal(parsed.type, 'image/png');
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};
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2019-05-06 11:31:26 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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