major revamp of http client functionalit

lib/utils/requestor.js

@@ -0,0 +1,64 @@
+const bent = require('bent');
+const parseUrl = require('parse-url');
+const basicAuth = require('./basic-auth');
+const assert = require('assert');
+
+function isRelativeUrl(u) {
+  return typeof u === 'string' && u.startsWith('/');
+}
+
+function isAbsoluteUrl(u) {
+  return typeof u === 'string' &&
+    u.startsWith('https://') || u.startsWith('http://');
+}
+
+class Requestor {
+  constructor(logger, hook) {
+    this.logger = logger;
+    this.url = hook.url;
+    this.method = hook.method || 'POST';
+    this.authHeader = basicAuth(hook.auth);
+
+    const u = parseUrl(this.url);
+    const myPort = u.port ? `:${u.port}` : '';
+    const baseUrl = `${u.protocol}://${u.resource}${myPort}`;
+
+    this.get = bent(baseUrl, 'GET', 'json', 200);
+    this.post = bent(baseUrl, 'POST', 'json', 200);
+
+    assert(isAbsoluteUrl(this.url));
+    assert(['GET', 'POST'].includes(this.method));
+    assert(!this.auth || typeof auth == 'object');
+  }
+
+  get hasAuth() {
+    return 'Authorization' in this.authHeader;
+  }
+
+  /**
+   * Make an HTTP request.
+   * All requests use json bodies.
+   * All requests expect a 200 statusCode on success
+   * @param {object|string} hook - may be a absolute or relative url, or an object
+   * @param {string} [hook.url] - an absolute or relative url
+   * @param {string} [hook.method] - 'GET' or 'POST'
+   * @param {object} [params] - request parameters
+   */
+  async request(hook, params) {
+    params = params || null;
+    if (isRelativeUrl(hook)) {
+      this.logger.debug({params}, `Requestor:request relative url ${hook}`);
+      return await this.post(hook, params, this.authHeader);
+    }
+    const url = hook.url;
+    const method = hook.method || 'POST';
+    const authHeader = isRelativeUrl(url) ? this.authHeader : basicAuth(hook.auth);
+
+    assert(url);
+    assert(['GET', 'POST'].includes(method));
+    return await this[method.toLowerCase()](url, params, authHeader);
+  }
+
+}
+
+module.exports = Requestor;