User Data Export and import (#699)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/699
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/services/migrator/abstractMigrationFile.js

@@ -0,0 +1,31 @@
+import AbstractService from '../abstractService'
+
+// This service builds on top of the abstract service and basically just hides away method names.
+// It enables migration services to be created with minimal overhead and even better method names.
+export default class AbstractMigrationFileService extends AbstractService {
+	serviceUrlKey = ''
+
+	constructor(serviceUrlKey) {
+		super({
+			create: '/migration/' + serviceUrlKey + '/migrate',
+		})
+		this.serviceUrlKey = serviceUrlKey
+	}
+
+	getStatus() {
+		return this.getM('/migration/' + this.serviceUrlKey + '/status')
+	}
+	
+	useCreateInterceptor() {
+		return false
+	}
+
+	migrate(file) {
+		console.log(file)
+		return this.uploadFile(
+			this.paths.create,
+			file,
+			'import',
+		)
+	}
+}