PreviewMessage: Add attachments (& misc changes) (#1715)

src/plugins/previewMessage/README.md

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+# PreviewMessage
+
+Lets you preview your message before sending it.
+
+![Example](https://i.imgur.com/etqbkzu.png)

src/plugins/previewMessage/index.tsx

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+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2023 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { generateId, sendBotMessage } from "@api/Commands";
+import ErrorBoundary from "@components/ErrorBoundary";
+import { Devs } from "@utils/constants";
+import definePlugin from "@utils/types";
+import { findByPropsLazy } from "@webpack";
+import { Button, ButtonLooks, ButtonWrapperClasses, DraftStore, DraftType, SelectedChannelStore, Tooltip, UserStore, useStateFromStores } from "@webpack/common";
+import { MessageAttachment } from "discord-types/general";
+
+interface Props {
+    type: {
+        analyticsName: string;
+        isEmpty: boolean;
+        attachments: boolean;
+    };
+}
+
+const UploadStore = findByPropsLazy("getUploads");
+
+const getDraft = (channelId: string) => DraftStore.getDraft(channelId, DraftType.ChannelMessage);
+
+
+const getImageBox = (url: string): Promise<{ width: number, height: number; } | null> =>
+    new Promise(res => {
+        const img = new Image();
+        img.onload = () =>
+            res({ width: img.width, height: img.height });
+
+        img.onerror = () =>
+            res(null);
+
+        img.src = url;
+    });
+
+
+const getAttachments = async (channelId: string) =>
+    await Promise.all(
+        UploadStore.getUploads(channelId, DraftType.ChannelMessage)
+            .map(async (upload: any) => {
+                const { isImage, filename, spoiler, item: { file } } = upload;
+                const url = URL.createObjectURL(file);
+                const attachment: MessageAttachment = {
+                    id: generateId(),
+                    filename: spoiler ? "SPOILER_" + filename : filename,
+                    // weird eh? if i give it the normal content type the preview doenst work
+                    content_type: undefined,
+                    size: await upload.getSize(),
+                    spoiler,
+                    // discord adds query params to the url, so we need to add a hash to prevent that
+                    url: url + "#",
+                    proxy_url: url + "#",
+                };
+
+                if (isImage) {
+                    const box = await getImageBox(url);
+                    if (!box) return attachment;
+
+                    attachment.width = box.width;
+                    attachment.height = box.height;
+                }
+
+                return attachment;
+            })
+    );
+
+
+export function PreviewButton(chatBoxProps: Props) {
+    const { isEmpty, attachments } = chatBoxProps.type;
+
+    const channelId = SelectedChannelStore.getChannelId();
+    const draft = useStateFromStores([DraftStore], () => getDraft(channelId));
+
+    if (chatBoxProps.type.analyticsName !== "normal") return null;
+
+    const hasAttachments = attachments && UploadStore.getUploads(channelId, DraftType.ChannelMessage).length > 0;
+    const hasContent = !isEmpty && draft?.length > 0;
+
+    if (!hasContent && !hasAttachments) return null;
+
+    return (
+        <Tooltip text="Preview Message">
+            {tooltipProps => (
+                <Button
+                    {...tooltipProps}
+                    onClick={async () =>
+                        sendBotMessage(
+                            channelId,
+                            {
+                                content: getDraft(channelId),
+                                author: UserStore.getCurrentUser(),
+                                attachments: hasAttachments ? await getAttachments(channelId) : undefined,
+                            }
+                        )}
+                    size=""
+                    look={ButtonLooks.BLANK}
+                    innerClassName={ButtonWrapperClasses.button}
+                    style={{ padding: "0 2px", height: "100%" }}
+                >
+                    <div className={ButtonWrapperClasses.buttonWrapper}>
+                        <img width={24} height={24} src="https://discord.com/assets/4c5a77a89716352686f590a6f014770c.svg" />
+                    </div>
+                </Button>
+            )}
+        </Tooltip>
+    );
+
+}
+
+export default definePlugin({
+    name: "PreviewMessage",
+    description: "Lets you preview your message before sending it.",
+    authors: [Devs.Aria],
+    patches: [
+        {
+            find: ".activeCommandOption",
+            replacement: {
+                match: /(.)\.push.{1,30}disabled:(\i),.{1,20}\},"gift"\)\)/,
+                replace: "$&;try{$2||$1.unshift($self.previewIcon(arguments[0]))}catch{}",
+            }
+        },
+    ],
+
+    previewIcon: ErrorBoundary.wrap(PreviewButton, { noop: true }),
+});