refactor: generalize API library

src/api/errors.ts

@@ -0,0 +1,28 @@
+enum ErrorType {
+    Unknown = 0,
+    InvalidToken = 401,
+    NotFound = 404,
+    InternalServerError = 500,
+}
+
+interface ApiError {
+    code: number,
+    type: ErrorType,
+    message?: string,
+    data?: any,
+}
+
+export function parse(code: number, data?: string): ApiError {
+    var type = ErrorType[ErrorType[code]] ?? ErrorType.Unknown;
+    if (code >= 500) type = ErrorType.InternalServerError;
+
+    var err: ApiError = { code, type };
+
+    if (data) {
+        var d = JSON.parse(data);
+        err.message = d.message;
+        err.data = d;
+    }
+
+    return err;
+}