Support custom short code stickers

Issue #105.

src/plugins/stickers.js

@@ -0,0 +1,66 @@
+const stickerPacks = {};
+stickerPacks.ordering = [];
+const stickerCodeMap = {};
+
+try {
+    const stickerPackInfo = require("!!raw-loader!@/assets/stickers/order.txt").default;
+    const packInfo = stickerPackInfo.split("\n");
+    for (let i = 0; i < packInfo.length; i++) {
+        const pack = packInfo[i];
+        if (pack && pack.length > 0) {
+            stickerPacks[pack] = [];
+            stickerPacks.ordering.push(pack);
+        }
+    }
+} catch (ignorederr) {
+    //
+}
+
+function importAll(r) {
+    return r.keys().map(res => {
+        // Remove"./"
+        const parts = res.split("/");
+        const pack = parts[1];
+        const sticker = parts[2].split(".")[0];
+        const image = r(res);
+        if (stickerPacks[pack] !== undefined) {
+            stickerPacks[pack].push({ image: image, name: sticker });
+            stickerCodeMap[":" + pack + "-" + sticker + ":"] = image;
+        }
+    });
+}
+importAll(require.context('@/assets/stickers/', true, /\.png$/));
+
+class Stickers {
+    constructor() {
+    }
+
+    isStickerShortcode(messageBody) {
+        if (messageBody && messageBody.startsWith(":") && messageBody.startsWith(":") && messageBody.length >= 5) {
+            const image = this.getStickerImage(messageBody);
+            return image != undefined && image != null;
+        }
+        return false;
+    }
+
+    getStickerShortcode(pack, sticker) {
+        return ":" + pack + "-" + sticker.name + ":";
+    }
+
+    getPacks() {
+        return stickerPacks.ordering;
+    }
+
+    getStickerImage(messageBody) {
+        if (!messageBody) return null;
+        if (messageBody.length < 5 || !messageBody.startsWith(":") || !messageBody.endsWith(":")) return null;
+        return stickerCodeMap[messageBody];
+    }
+
+    stickersInPack(pack) {
+        return stickerPacks[pack];
+    }
+}
+
+var gStickers = new Stickers();
+export default gStickers;