From a68fe177ae41f2e58a64b3f8dcf3f825d004eeca Mon Sep 17 00:00:00 2001
From: Frederick Muriuki Muriithi
Date: Mon, 1 Jul 2024 14:59:32 -0500
Subject: Respond with JSON. Handle error messages on UI.

---
 .../rqtl2/upload-rqtl2-bundle-step-01.html         | 15 +++++++++++++++
 qc_app/upload/rqtl2.py                             | 22 ++++++++++++++++++----
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/qc_app/templates/rqtl2/upload-rqtl2-bundle-step-01.html b/qc_app/templates/rqtl2/upload-rqtl2-bundle-step-01.html
index c6c79e5..07c240f 100644
--- a/qc_app/templates/rqtl2/upload-rqtl2-bundle-step-01.html
+++ b/qc_app/templates/rqtl2/upload-rqtl2-bundle-step-01.html
@@ -240,6 +240,21 @@
               window.location.replace(uri);
           }
       });
+
+      r.on("error", (message, file) => {
+          filename = (file.webkitRelativePath
+                      || file.relativePath
+                      || file.fileName
+                      || file.name);
+          jsonmsg = JSON.parse(message);
+          alert("There was an error while uploading your file '"
+                + filename
+                + "'. The error message was:\n\n\t"
+                + jsonmsg.error
+                + " ("
+                + jsonmsg.statuscode
+                + "): " + jsonmsg.message);
+      })
   } else {
       setup_upload_handlers(
           "frm-upload-rqtl2-bundle", make_data_uploader(
diff --git a/qc_app/upload/rqtl2.py b/qc_app/upload/rqtl2.py
index 31d5a9d..e691636 100644
--- a/qc_app/upload/rqtl2.py
+++ b/qc_app/upload/rqtl2.py
@@ -13,11 +13,11 @@ import MySQLdb as mdb
 from redis import Redis
 from MySQLdb.cursors import DictCursor
 from werkzeug.utils import secure_filename
-from werkzeug.exceptions import NotFound, BadRequest
 from flask import (
     flash,
     escape,
     request,
+    jsonify,
     url_for,
     redirect,
     Response,
@@ -254,13 +254,21 @@ def upload_rqtl2_bundle_chunked_get(# pylint: disable=["unused-argument"]
     filename = request.args.get("resumableFilename", type=str) or ""
     chunk = request.args.get("resumableChunkNumber", type=int) or 0
     if not(fileid or filename or chunk):
-        raise BadRequest("At least one required query parameter is missing.")
+        return jsonify({
+            "message": "At least one required query parameter is missing.",
+            "error": "BadRequest",
+            "statuscode": 400
+        }), 400
 
     if Path(chunks_directory(fileid),
             chunk_name(filename, chunk)).exists():
         return "OK"
 
-    raise NotFound(description=f"Chunk {chunk} was not found.")
+    return jsonify({
+            "message": f"Chunk {chunk} was not found.",
+            "error": "NotFound",
+            "statuscode": 404
+        }), 404
 
 
 def __merge_chunks__(targetfile: Path, chunkpaths: tuple[Path, ...]) -> Path:
@@ -294,7 +302,13 @@ def upload_rqtl2_bundle_chunked_post(species_id: int, population_id: int):
     _targetfile = Path(app.config["UPLOAD_FOLDER"], _fileid)
 
     if _targetfile.exists():
-        raise BadRequest("The file has already been uploaded.")
+        return jsonify({
+            "message": (
+                "A file with a similar unique identifier has previously been "
+                "uploaded and possibly is/has being/been processed."),
+            "error": "BadRequest",
+            "statuscode": 400
+        }), 400
 
     # save chunk data
     chunks_directory(_fileid).mkdir(exist_ok=True)
-- 
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