Add [Steam] Service (#2140)

* Add Steam Service

services/steam/steam-base.js

@@ -0,0 +1,48 @@
+'use strict'
+
+const BaseJsonService = require('../base-json')
+
+/**
+ * The steam api is based like /{interface}/{method}/v{version}/
+ * @see https://partner.steamgames.com/doc/webapi_overview#2
+ */
+module.exports = class BaseSteamAPI extends BaseJsonService {
+  /**
+   * Steam API Interface
+   * @see https://partner.steamgames.com/doc/webapi_overview#2
+   */
+  static get interf() {
+    throw new Error(`interf() was not implement for ${this.name}`)
+  }
+
+  /**
+   * Steam API Method
+   * @see https://partner.steamgames.com/doc/webapi_overview#2
+   */
+  static get method() {
+    throw new Error(`method() was not implement for ${this.name}`)
+  }
+
+  /**
+   * Steam API Version
+   * @see https://partner.steamgames.com/doc/webapi_overview#2
+   */
+  static get version() {
+    throw new Error(`version() was not implement for ${this.name}`)
+  }
+
+  async fetch({ schema, options }) {
+    const interf = this.constructor.interf
+    const method = this.constructor.method
+    const version = this.constructor.version
+    const url = `https://api.steampowered.com/${interf}/${method}/v${version}/?format=json`
+    return this._requestJson({
+      url,
+      schema: schema,
+      errorMessages: {
+        400: 'bad request',
+      },
+      options: options,
+    })
+  }
+}