Adds deployment for icons

source/Icons/IconCache.ts

@@ -0,0 +1,52 @@
+import {Routes} from "discord.js";
+import {DiscordClient} from "../Discord/DiscordClient";
+
+export class IconCache {
+  private existingIcons: Map<string, string>|null;
+  
+  constructor(
+    private readonly client: DiscordClient
+  ) {
+    
+  }
+  
+  public get(iconName: string): string | null {
+    if (!this.existingIcons?.has(iconName) ?? false) {
+      return null;
+    }
+    
+    return this.existingIcons?.get(iconName) ?? null;
+  }
+  
+  public async set(iconName: string, pngBuffer: Buffer) {
+    const pngBase64 = pngBuffer.toString("base64");
+    const iconDataUrl = `data:image/png;base64,${pngBase64}`;
+
+    await this.client.RESTClient.post(
+      Routes.applicationEmojis(this.client.ApplicationId),
+      {
+        body: {
+          name: iconName,
+          image: iconDataUrl
+        }
+      }
+    )
+  }
+  
+  public async populate() {
+    if (this.existingIcons != null) {
+      return;
+    }
+    
+    const existingEmojis: DiscordIconRequest = await this.client.RESTClient.get(
+      Routes.applicationEmojis(this.client.ApplicationId)
+    )
+    
+    this.existingIcons = new Map<string, string>(
+      existingEmojis.items.map((item) => {
+        return [ item.name, item.id ]
+      })
+    )
+  }
+
+}