Adds user agent header for requests to Green Web Foundation APIs

Author: fershad

.all-contributorsrc

@@ -132,8 +132,17 @@
         "bug",
         "code"
       ]
+    },
+    {
+      "login": "sfishel18",
+      "name": "Simon Fishel",
+      "avatar_url": "https://avatars.githubusercontent.com/u/294695?v=4",
+      "profile": "https://github.com/sfishel18",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,
   "linkToUsage": false
-}
+}

.esbuild.browser.js

@@ -1,4 +1,7 @@
+const esbuildCommon = require("./.esbuild.common");
+
 require('esbuild').buildSync({
+  ...esbuildCommon,
   entryPoints: ['src/index.js'],
   outdir: 'dist/iife',
   globalName: 'co2',

.esbuild.common.js

@@ -0,0 +1,7 @@
+const CO2JS_VERSION = require("./package.json").version;
+
+module.exports = {
+  define: {
+    "process.env.CO2JS_VERSION": JSON.stringify(CO2JS_VERSION),
+  },
+};

.esbuild.esm.js

@@ -3,7 +3,8 @@ const esbuild = require('esbuild')
 // For this build however we need to filter out some extra files
 // that are used for nodejs, but not in browsers, so we use the
 // library directly instead of using `esbuild-plugin-glob` as a plugin
-const glob = require('tiny-glob');
+const glob = require('tiny-glob')
+const esbuildCommon = require('./.esbuild.common')
 
 async function main() {
   const results = await glob('src/**/!(*.test.js|test-constants.js|!(*.js))')
@@ -12,6 +13,7 @@ async function main() {
   const justBrowserCompatibleFiles = results.filter(filepath => !filepath.endsWith('node.js'))
 
   esbuild.build({
+    ...esbuildCommon,
     entryPoints: justBrowserCompatibleFiles,
     bundle: false,
     minify: false,

.esbuild.node.js

@@ -1,7 +1,9 @@
 const { globPlugin } = require('esbuild-plugin-glob');
+const esbuildCommon = require('./.esbuild.common');
 
 function main() {
   require('esbuild').build({
+    ...esbuildCommon,
     entryPoints: ['src/**/!(*.test.js|test-constants.js|!(*.js))'],
     bundle: false,
     minify: false,

__mocks__/https.js

@@ -0,0 +1,28 @@
+import { getApiRequestHeaders } from "../src/helpers/index.js";
+const https = jest.createMockFromModule("https");
+import { Stream } from "stream";
+
+const stream = new Stream();
+
+https.get.mockImplementation((url, options, callback) => {
+  url, { headers: getApiRequestHeaders("TestRunner") }, callback(stream);
+  if (url.includes("greencheckmulti")) {
+    stream.emit(
+      "data",
+      Buffer.from(
+        `{"google.com": {"url":"google.com","hosted_by":"Google Inc.","hosted_by_website":"https://www.google.com","partner":null,"green":true}}`
+      )
+    );
+  } else {
+    stream.emit(
+      "data",
+      Buffer.from(
+        `{"url":"google.com","hosted_by":"Google Inc.","hosted_by_website":"https://www.google.com","partner":null,"green":true}`
+      )
+    );
+  }
+
+  stream.emit("end");
+});
+
+module.exports = https;

package.json

@@ -29,7 +29,8 @@
     "intensity-data:average": "node data/functions/generate_average_co2.js",
     "intensity-data:marginal": "node data/functions/generate_marginal_co2.js",
     "intensity-data": "npm run intensity-data:average && npm run intensity-data:marginal && npm run format-data",
-    "format-data": "cd data && prettier --write '**/*.{js,json}'"
+    "format-data": "cd data && prettier --write '**/*.{js,json}'",
+    "version": "npm run build"
   },
   "keywords": [
     "sustainability",
@@ -75,4 +76,4 @@
     "type": "git",
     "url": "https://github.com/thegreenwebfoundation/co2.js.git"
   }
-}
+}

src/helpers/index.js

@@ -172,4 +172,14 @@ function parseOptions(options) {
   return adjustments;
 }
 
-export { formatNumber, parseOptions };
+/**
+ * Returns an object containing all the HTTP headers to use when making a request to the Green Web Foundation API.
+ * @param {string} comment - Optional. The app, site, or organisation that is making the request.
+ *
+ * @returns {import('http').OutgoingHttpHeaders}
+ */
+function getApiRequestHeaders(comment = "") {
+  return { "User-Agent": `co2js/${process.env.CO2JS_VERSION} ${comment}` };
+}
+
+export { formatNumber, parseOptions, getApiRequestHeaders };

src/hosting-api.js

@@ -1,27 +1,34 @@
 "use strict";
 
+import { getApiRequestHeaders } from "./helpers/index.js";
+
 /**
  * Check if a string or array of domains has been provided
  * @param {string|array} domain - The domain to check, or an array of domains to be checked.
+ * @param {string} userAgentIdentifier - Optional. The app, site, or organisation that is making the request.
  */
 
-function check(domain) {
+function check(domain, userAgentIdentifier) {
   // is it a single domain or an array of them?
   if (typeof domain === "string") {
-    return checkAgainstAPI(domain);
+    return checkAgainstAPI(domain, userAgentIdentifier);
   } else {
-    return checkDomainsAgainstAPI(domain);
+    return checkDomainsAgainstAPI(domain, userAgentIdentifier);
   }
 }
 
 /**
  * Check if a domain is hosted by a green web host by querying the Green Web Foundation API.
  * @param {string} domain - The domain to check.
+ * @param {string} userAgentIdentifier - Optional. The app, site, or organisation that is making the request.
  * @returns {boolean} - A boolean indicating whether the domain is hosted by a green web host.
  */
-async function checkAgainstAPI(domain) {
+async function checkAgainstAPI(domain, userAgentIdentifier) {
   const req = await fetch(
-    `https://api.thegreenwebfoundation.org/greencheck/${domain}`
+    `https://api.thegreenwebfoundation.org/greencheck/${domain}`,
+    {
+      headers: getApiRequestHeaders(userAgentIdentifier),
+    }
   );
   const res = await req.json();
   return res.green;
@@ -30,15 +37,18 @@ async function checkAgainstAPI(domain) {
 /**
  * Check if an array of domains is hosted by a green web host by querying the Green Web Foundation API.
  * @param {array} domains - An array of domains to check.
+ * @param {string} userAgentIdentifier - Optional. The app, site, or organisation that is making the request.
  * @returns {array} - An array of domains that are hosted by a green web host.
  */
 
-async function checkDomainsAgainstAPI(domains) {
+async function checkDomainsAgainstAPI(domains, userAgentIdentifier) {
   try {
     const apiPath = "https://api.thegreenwebfoundation.org/v2/greencheckmulti";
     const domainsString = JSON.stringify(domains);
 
-    const req = await fetch(`${apiPath}/${domainsString}`);
+    const req = await fetch(`${apiPath}/${domainsString}`, {
+      headers: getApiRequestHeaders(userAgentIdentifier),
+    });
 
     const allGreenCheckResults = await req.json();
 

src/hosting-api.test.js

@@ -1,36 +1,72 @@
 "use strict";
 
-import hosting from "./hosting-node.js";
-import nock from "nock";
+import hosting from "./hosting-api.js";
 /* eslint-disable jest/no-disabled-tests */
+
+process.env.CO2JS_VERSION = "1.2.34";
+const requestHeaderComment = "TestRunner";
+
+global.fetch = jest.fn(() =>
+  Promise.resolve({
+    json: () => Promise.resolve({ green: true }),
+  })
+);
+
 describe("hostingAPI", () => {
+  beforeEach(() => {
+    fetch.mockClear();
+  });
   describe("checking a single domain with #check", () => {
-    it.skip("using the API", async () => {
-      const scope = nock("https://api.thegreenwebfoundation.org/")
-        .get("/greencheck/google.com")
-        .reply(200, {
-          url: "google.com",
-          green: true,
-        });
+    it("using the API", async () => {
       const res = await hosting.check("google.com");
+      expect(fetch).toHaveBeenCalledTimes(1);
+      expect(fetch).toHaveBeenLastCalledWith(
+        expect.any(String),
+        expect.objectContaining({
+          headers: { "User-Agent": "co2js/1.2.34 " },
+        })
+      );
+      expect(res).toEqual(true);
+    });
+    it("sets the correct user agent header", async () => {
+      const res = await hosting.check("google.com", requestHeaderComment);
+
+      expect(fetch).toHaveBeenCalledTimes(1);
+      expect(fetch).toHaveBeenLastCalledWith(
+        expect.any(String),
+        expect.objectContaining({
+          headers: { "User-Agent": "co2js/1.2.34 TestRunner" },
+        })
+      );
       expect(res).toEqual(true);
     });
   });
   describe("implicitly checking multiple domains with #check", () => {
-    it.skip("using the API", async () => {
-      const scope = nock("https://api.thegreenwebfoundation.org/")
-        .get("/v2/greencheckmulti/[%22google.com%22,%22kochindustries.com%22]")
-        .reply(200, {
-          "google.com": {
-            url: "google.com",
-            green: true,
-          },
-          "kochindustries.com": {
-            url: "kochindustries.com",
-            green: null,
-          },
-        });
+    it("using the API", async () => {
+      fetch.mockImplementation(() =>
+        Promise.resolve({
+          json: () =>
+            Promise.resolve({
+              "google.com": { url: "google.com", green: true },
+            }),
+        })
+      );
       const res = await hosting.check(["google.com", "kochindustries.com"]);
+      expect(fetch).toHaveBeenCalledTimes(1);
+      expect(res).toContain("google.com");
+    });
+    it("sets the correct user agent header", async () => {
+      const res = await hosting.check(
+        ["google.com", "kochindustries.com"],
+        requestHeaderComment
+      );
+      expect(fetch).toHaveBeenCalledTimes(1);
+      expect(fetch).toHaveBeenLastCalledWith(
+        expect.any(String),
+        expect.objectContaining({
+          headers: { "User-Agent": "co2js/1.2.34 TestRunner" },
+        })
+      );
       expect(res).toContain("google.com");
     });
   });