Initial commit

Author: fython

.gitignore

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+node_modules
+.idea
+.vscode
+package-lock.json

README.md

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+Express API
+======
+
+## Examples
+
+Read codes in [index.js](./index.js)
+
+### Init
+
+```javascript
+const ExpressApi = require('./src/api');
+const api = new ExpressApi();
+const api = new ExpressApi({ tokenV2, cookie }); // Optional, you can load tokenV2 and cookie from last state. But we recommend to init new token every launch.
+
+await api.init(); // If tokenV2 and cookie is loaded from last state, you can skip this call.
+```
+
+### Get
+
+```javascript
+const data = await api.get(packageNo, {company: companyCode});
+```
+
+If you don't know which company is carrying this package, you can ignore `company` options.
+
+```javascript
+const data = await api.get(packageNo);
+```
+
+## License
+
+No Licenses. Just use as you like.

index.js

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+const ExpressApi = require('./src/api');
+
+async function main(num) {
+    const api = new ExpressApi();
+    const tokenV2 = await api.init();
+    console.log(`TokenV2: ${tokenV2}`);
+    const result = await api.get(num);
+    console.log(JSON.stringify(result, null, 2));
+}
+
+if (process.argv.length < 3) {
+    console.log('Please specify a package number to query. For example: "node ./index.js 123456789012"');
+    return;
+}
+main(process.argv[2]);

package.json

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+{
+  "name": "du-express-api",
+  "version": "0.0.1",
+  "description": "Example of using Du Express Api",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "author": "fython",
+  "license": "MIT",
+  "dependencies": {
+    "axios": "^0.19.2",
+    "axios-cookiejar-support": "^1.0.0",
+    "tough-cookie": "^4.0.0"
+  }
+}

src/api.js

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+const axios = require('axios');
+const axiosCookieJarSupport = require('axios-cookiejar-support').default;
+const tough = require('tough-cookie');
+
+const GET_TOKEN_URL = 'https://www.baidu.com/baidu?isource=infinity&iname=baidu&itype=web&tn=02003390_42_hao_pg&ie=utf-8&wd=%E5%BF%AB%E9%80%92';
+const TOKEN_PATTERN = /tokenV2=(.*?)"/;
+const GET_EXPRESS_URL = 'https://express.baidu.com/express/api/express';
+const BROWSER_UA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36';
+
+class ExpressApi {
+    constructor({ cookie, tokenV2 } = {}) {
+        this.tokenV2 = tokenV2;
+        this.axios = axios.create({
+            withCredentials: true,
+            headers: {
+                'User-Agent': BROWSER_UA,
+            }
+        });
+        axiosCookieJarSupport(this.axios);
+        this.axios.defaults.jar = new tough.CookieJar();
+        if (cookie) {
+            this.axios.defaults.headers.common['Cookie'] = cookie;
+        }
+    }
+
+    async init() {
+        const res = await this.axios.get(GET_TOKEN_URL);
+        if (res.status !== 200) {
+            throw new Error('Cannot get token by du search pages');
+        }
+        const pageData = res.data;
+        const regRes = TOKEN_PATTERN.exec(pageData);
+        if (regRes.length <= 0) {
+            throw new Error('Cannot find token from response data');
+        }
+        this.tokenV2 = regRes[1];
+        return this.tokenV2;
+    }
+
+    async get(num, { company } = {}) {
+        const opts = {
+            params: {
+                tokenV2: this.tokenV2,
+                appid: 4001,
+                nu: num,
+            },
+        };
+        if (company) {
+            opts.params.com = company;
+        }
+        const res = await this.axios.get(GET_EXPRESS_URL, opts);
+        return res.data;
+    }
+}
+
+module.exports = ExpressApi;