new application stuff very hype (#1764)

* application stuff, more to come

* docstrings

* Update Message.js

src/structures/ClientApplication.js

@@ -0,0 +1,190 @@
+const Snowflake = require('../util/Snowflake');
+const Constants = require('../util/Constants');
+
+/**
+ * Represents an OAuth2 Application.
+ */
+class OAuth2Application {
+  constructor(client, data) {
+    /**
+     * The client that instantiated the application
+     * @name OAuth2Application#client
+     * @type {Client}
+     * @readonly
+     */
+    Object.defineProperty(this, 'client', { value: client });
+
+    this.setup(data);
+  }
+
+  setup(data) {
+    /**
+     * The ID of the app
+     * @type {Snowflake}
+     */
+    this.id = data.id;
+
+    /**
+     * The name of the app
+     * @type {string}
+     */
+    this.name = data.name;
+
+    /**
+     * The app's description
+     * @type {string}
+     */
+    this.description = data.description;
+
+    /**
+     * The app's icon hash
+     * @type {string}
+     */
+    this.icon = data.icon;
+
+    /**
+     * The app's RPC origins
+     * @type {?string[]}
+     */
+    this.rpcOrigins = data.rpc_origins;
+
+    /**
+     * The app's redirect URIs
+     * @type {string[]}
+     */
+    this.redirectURIs = data.redirect_uris;
+
+    /**
+     * If this app's bot requires a code grant when using the OAuth2 flow
+     * @type {boolean}
+     */
+    this.botRequireCodeGrant = data.bot_require_code_grant;
+
+    /**
+     * If this app's bot is public
+     * @type {boolean}
+     */
+    this.botPublic = data.bot_public;
+
+    /**
+     * If this app can use rpc
+     * @type {boolean}
+     */
+    this.rpcApplicationState = data.rpc_application_state;
+
+    /**
+     * Object containing basic info about this app's bot
+     * @type {Object}
+     */
+    this.bot = data.bot;
+
+    /**
+     * The flags for the app
+     * @type {number}
+     */
+    this.flags = data.flags;
+
+    /**
+     * OAuth2 secret for the application
+     * @type {string}
+     */
+    this.secret = data.secret;
+
+    if (data.owner) {
+      /**
+       * The owner of this OAuth application
+       * @type {?User}
+       */
+      this.owner = this.client.dataManager.newUser(data.owner);
+    }
+  }
+
+  /**
+   * The timestamp the app was created at
+   * @type {number}
+   * @readonly
+   */
+  get createdTimestamp() {
+    return Snowflake.deconstruct(this.id).timestamp;
+  }
+
+  /**
+   * The time the app was created
+   * @type {Date}
+   * @readonly
+   */
+  get createdAt() {
+    return new Date(this.createdTimestamp);
+  }
+
+  /**
+   * A link to the application's icon
+   * @param {Object} [options={}] Options for the icon url
+   * @param {string} [options.format='webp'] One of `webp`, `png`, `jpg`
+   * @param {number} [options.size=128] One of `128`, '256', `512`, `1024`, `2048`
+   * @returns {?string} URL to the icon
+   */
+  iconURL({ format, size } = {}) {
+    if (!this.icon) return null;
+    return Constants.Endpoints.CDN(this.client.options.http.cdn).AppIcon(this.id, this.icon, { format, size });
+  }
+
+  /**
+   * Get rich presence assets
+   * @returns {Promise<Object>}
+   */
+  fetchAssets() {
+    return this.client.api.applications(this.id).assets.get()
+      .then(assets => assets.map(a => ({
+        id: a.id,
+        name: a.name,
+        type: Object.keys(Constants.ClientApplicationAssetTypes)[a.type - 1],
+      })));
+  }
+
+  /**
+   * Create a rich presence asset
+   * @param {string} name Name of the asset
+   * @param {Base64Resolvable} data Data of the asset
+   * @param {string} type Type of the asset. `big`, or `small`
+   * @returns {Promise}
+   */
+  createAsset(name, data, type) {
+    return this.client.resolveBase64(data).then(b64 =>
+      this.client.api.applications(this.id).assets.post({ data: {
+        name,
+        data: b64,
+        type: Constants.ClientApplicationAssetTypes[type.toUpperCase()],
+      } }));
+  }
+
+  /**
+   * Reset the app's secret.
+   * <warn>This is only available when using a user account.</warn>
+   * @returns {OAuth2Application}
+   */
+  resetSecret() {
+    return this.client.api.oauth2.applications[this.id].reset.post()
+      .then(app => new OAuth2Application(this.client, app));
+  }
+
+  /**
+   * Reset the app's bot token.
+   * <warn>This is only available when using a user account.</warn>
+   * @returns {OAuth2Application}
+   */
+  resetToken() {
+    return this.client.api.oauth2.applications[this.id].bot.reset.post()
+      .then(app => new OAuth2Application(this.client, Object.assign({}, this, { bot: app })));
+  }
+
+  /**
+   * When concatenated with a string, this automatically concatenates the app name rather than the app object.
+   * @returns {string}
+   */
+  toString() {
+    return this.name;
+  }
+}
+
+module.exports = OAuth2Application;