Question

关于将图像上载和调整大小到firebase函数有很多描述。但是我想相反。

我想通过firebase函数传递图像作为对请求的答复。而且我想使用cors！

我真的很感动，所以能得到任何帮助。

Answer 1

这是使用TypeScript和Puppeteer捕获屏幕截图并设置对屏幕截图的响应的完整Firebase功能代码。

    import * as functions from 'firebase-functions';
    import * as puppeteer from "puppeteer";
    
    const runtimeOpts = {
      timeoutSeconds: 120,
      memory: <const> '1GB'
    };
    
    export const search = functions.runWith(runtimeOpts).https.onRequest(async (request, response) => {
      try {
        const imageBuffer: Buffer = await generateScreenShot();
        response.writeHead(200, {'Content-Type': 'image/png'});
        response.write(imageBuffer.toString('binary'), 'binary');
        response.end()
      } catch (err) {
        console.error(err);
      }
    })
    
    function generateScreenShot(): Promise<Buffer> {
      return new Promise<Buffer>(async (resolve, reject) => {
        try {
          const browser = await puppeteer.launch({args: ['--no-sandbox']});
          const page = await browser.newPage();
          await page.goto('http://example.ee', {
            waitUntil: 'networkidle2'
          });
          await page.waitFor(500);
          const imageBuffer: Buffer = await page.screenshot({fullPage: true});
          await browser.close();
    
          resolve(imageBuffer);
        } catch (err) {
          reject(err);
        }
      });
    }

如何从Firebase函数发送图像文件？

1 个答案: