baidu_ocr_nodejs.js

const Koa = require('koa');
const Router = require('koa-router');
const static = require('koa-static')
const nunjucks = require('koa-nunjucks-2');
const multer = require('koa-multer');
const path = require('path');
const fs = require('fs');
const app = new Koa();
const router = new Router();
const AipOcrClient = require("baidu-aip-sdk").ocr;

const APP_ID = "";
const API_KEY = "";
const SECRET_KEY = "";
const client = new AipOcrClient(APP_ID, API_KEY, SECRET_KEY);

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, './uploads')
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname)
  }
})

const upload = multer({ storage: storage });

router
  .get('/', async (ctx, next) => {
    await ctx.render('page/index');
  })

  // fieldname: 'avatar',
  // originalname: 'main_icon.png',
  // encoding: '7bit',
  // mimetype: 'image/png',
  // destination: 'uploads/',
  // filename: '6d8b3f078e4ca33d4be77b9e92ddce05',
  // path: 'uploads/6d8b3f078e4ca33d4be77b9e92ddce05',
  // size: 41208 
  .post('/upload', upload.single('file'), async (ctx, next) => {
    let file = ctx.req.file;
    ctx.body = {
      code: 200,
      data: {
        url: file.originalname
      }
    };
  })
  .get('/ocr/:path', async ctx => {
    const options = {};
    options["language_type"] = "CHN_ENG";
    options["probability"] = "true";
    let path = ctx.params.path;
    const image = fs.readFileSync('./uploads/' + path).toString("base64");
    let result = await client.accurateBasic(image, options)
    await ctx.render('page/ocr', { words: result.words_result})
  });


app.use(static(
  path.join( __dirname,  '/uploads')
));

app.use(nunjucks({
  ext: 'html',
  path: path.join(__dirname, 'view'),
  nunjucksConfig: {
    trimBlocks: true
  }
}));

app
  .use(router.routes())
  .use(router.allowedMethods());

app.listen(7002, () => {
  console.log('server run at http://127.0.0.1:7002');
});