feat: add tag deletion from images

src/api/routes/files/tagDelPOST.js

@@ -0,0 +1,38 @@
+const Route = require('../../structures/Route');
+
+class tagDelPost extends Route {
+	constructor() {
+		super('/file/tag/del', 'post');
+	}
+
+	async run(req, res, db, user) {
+		if (!req.body) return res.status(400).json({ message: 'No body provided' });
+
+		const { fileId, tagName } = req.body;
+		if (!fileId || !tagName.length) return res.status(400).json({ message: 'No tag provided' });
+
+		// Make sure the file belongs to the user
+		const file = await db.table('files').where({ id: fileId, userId: user.id }).first();
+		if (!file) return res.status(400).json({ message: 'File doesn\'t exist.' });
+
+		// Make sure user has a tag like that
+		const tag = await db.table('tags').where({ name: tagName, userId: user.id }).first();
+		if (!tag) return res.status(400).json({ message: 'Tag doesn\'t exist. ' });
+
+		try {
+			await db.table('fileTags')
+				.where({ fileId, tagId: tag.id })
+				.delete();
+		} catch (error) {
+			return super.error(res, error);
+		}
+
+		return res.json({
+			message: 'Successfully removed tag from file',
+			data: { fileId, tag },
+		});
+		// eslint-disable-next-line consistent-return
+	}
+}
+
+module.exports = tagDelPost;