Quality of life changes (#968)

* + Added function to get a user's default avatar
+ Added HOST constant to Constants
+ Added assets endpoint
+ Added quality of life function to get a user's avatar or default avatar
+ Added quality of life function to get member's nickname or username

* * Fixed invocation of a getter.

* Fixed lint issue

* Made the API constant use the HOST constant for DRY-ness
Changed DOC comment to be more descriptive

* Update GuildMember.js

src/structures/GuildMember.js

@@ -182,6 +182,15 @@ class GuildMember {
     return this.user.id;
   }
 
+  /**
+   * The nickname of the member, or their username if they don't have one
+   * @type {string}
+   * @readonly
+   */
+  get displayName() {
+    return this.nickname || this.user.username;
+  }
+
   /**
    * The overall set of permissions for the guild member, taking only roles into account
    * @type {EvaluatedPermissions}

src/structures/User.js

@@ -104,6 +104,26 @@ class User {
     return Constants.Endpoints.avatar(this.id, this.avatar);
   }
 
+  /**
+   * A link to the user's default avatar
+   * @type {string}
+   * @readonly
+   */
+  get defaultAvatarURL() {
+    let defaultAvatars = Object.values(Constants.DefaultAvatars);
+    let defaultAvatar = this.discriminator % defaultAvatars.length;
+    return Constants.endpoints.assets(`${defaultAvatars[defaultAvatar]}.png`);
+  }
+
+  /**
+   * A link to the user's avatar if they have one. Otherwise a link to their default avatar will be returned
+   * @type {string}
+   * @readonly
+   */
+  get displayAvatarURL() {
+    return this.avatarURL || this.defaultAvatarURL;
+  }
+
   /**
    * The note that is set for the user
    * <warn>This is only available when using a user account.</warn>

src/util/Constants.js

@@ -71,7 +71,8 @@ exports.Errors = {
 };
 
 const PROTOCOL_VERSION = exports.PROTOCOL_VERSION = 6;
-const API = exports.API = `https://discordapp.com/api/v${PROTOCOL_VERSION}`;
+const HOST = exports.HOST = `https://discordapp.com`;
+const API = exports.API = `${HOST}/api/v${PROTOCOL_VERSION}`;
 const Endpoints = exports.Endpoints = {
   // general
   login: `${API}/auth/login`,
@@ -80,6 +81,7 @@ const Endpoints = exports.Endpoints = {
   botGateway: `${API}/gateway/bot`,
   invite: (id) => `${API}/invite/${id}`,
   inviteLink: (id) => `https://discord.gg/${id}`,
+  assets: (asset) => `${HOST}/assets/${asset}`,
   CDN: 'https://cdn.discordapp.com',
 
   // users
@@ -311,6 +313,14 @@ exports.MessageTypes = {
   6: 'PINS_ADD',
 };
 
+exports.DefaultAvatars = {
+  BLURPLE: '6debd47ed13483642cf09e832ed0bc1b',
+  GREY: '322c936a8c8be1b803cd94861bdfa868',
+  GREEN: 'dd4dbc0016779df1378e7812eabaa04d',
+  ORANGE: '0e291f67c9274a1abdddeb3fd919cbaa',
+  RED: '1cbd08c76f8af6dddce02c5138971129',
+};
+
 const PermissionFlags = exports.PermissionFlags = {
   CREATE_INSTANT_INVITE: 1 << 0,
   KICK_MEMBERS: 1 << 1,