Enable upload of zipfiles

1 files changed, 75 insertions, 21 deletions

diff --git a/qc_app/entry.py b/qc_app/entry.py
index b7b4b6f..25e2eed 100644
--- a/qc_app/entry.py
+++ b/qc_app/entry.py
@@ -1,5 +1,10 @@
 """Entry-point module"""
 import os
+import random
+import string
+import mimetypes
+from typing import Tuple
+from zipfile import ZipFile, is_zipfile
 
 from werkzeug.utils import secure_filename
 from flask import (
@@ -13,38 +18,87 @@ from flask import (
 
 entrybp = Blueprint("entry", __name__)
 
+def errors(request) -> Tuple[str, ...]:
+    """Return a tuple of the errors found in the `request`. If no error is
+    found, then an empty tuple is returned."""
+    def __filetype_error__():
+        return (
+            ("Invalid file type provided.",)
+            if request.form["filetype"] not in ("average", "standard-error")
+            else tuple())
+
+    def __file_missing_error__():
+        return (
+            ("No file was uploaded.",)
+            if ("qc_text_file" not in request.files or
+                request.files["qc_text_file"].filename == "")
+            else tuple())
+
+    def __file_mimetype_error__():
+        text_file = request.files["qc_text_file"]
+        return (
+            (
+                ("Invalid file! Expected a tab-separated-values file, or a zip "
+                 "file of the a tab-separated-values file."),)
+            if text_file.mimetype
+            not in ("text/tab-separated-values", "application/zip")
+            else tuple())
+
+    return (
+        __filetype_error__() +
+        (__file_missing_error__() or __file_mimetype_error__()))
+
+def zip_file_errors(filepath, upload_dir) -> Tuple[str, ...]:
+    """Check the uploaded zip file for errors."""
+    zfile_errors = ("Fail always!!",)
+    if is_zipfile(filepath):
+        zfile = ZipFile(filepath, "r")
+        infolist = zfile.infolist()
+        if len(infolist) != 1:
+            zfile_errors = zfile_errors + (
+                ("Expected exactly one (1) member file within the uploaded zip "
+                 "file. Got {len(infolist)} member files."))
+        if len(infolist) == 1 and infolist[0].is_dir():
+            zfile_errors = zfile_errors + (
+                ("Expected a member text file in the uploaded zip file. Got a "
+                 "directory/folder."))
+
+        if len(infolist) == 1 and not infolist[0].is_dir():
+            zfile.extract(infolist[0], path=upload_dir)
+            mime = mimetypes.guess_type(f"{upload_dir}/{infolist[0].filename}")
+            if mime[0] != "text/tab-separated-values":
+                zfile_errors = zfile_errors + (
+                    ("Expected the member text file in the uploaded zip file to"
+                     " be a tab-separated file."))
+
+    return zfile_errors
+
 @entrybp.route("/", methods=["GET", "POST"])
 def upload_file():
     """Enables uploading the files"""
+    upload_dir = app.config["UPLOAD_FOLDER"]
     if request.method == "GET":
         return render_template("index.html")
 
-    errors = False
-    if request.form["filetype"] not in ("average", "standard-error"):
-        flash("Invalid file type provided.", "alert-error")
-        errors = True
+    request_errors = errors(request)
+    if request_errors:
+        for error in request_errors:
+            flash(error, "alert-error")
+        return render_template("index.html")
 
-    if ("qc_text_file" not in request.files or
-        request.files["qc_text_file"].filename == ""):
-        flash("No file was uploaded.", "alert-error")
-        errors = True
+    filename = secure_filename(request.files["qc_text_file"].filename)
+    if not os.path.exists(upload_dir):
+        os.mkdir(upload_dir)
 
-    text_file = request.files["qc_text_file"]
-    if text_file.mimetype != "text/tab-separated-values":
-        flash("Invalid file! Expected a tab-separated-values file.",
-              "alert-error")
-        errors = True
+    filepath = os.path.join(upload_dir, filename)
+    request.files["qc_text_file"].save(os.path.join(upload_dir, filename))
 
-    if errors:
+    zip_errors = zip_file_errors(filepath, upload_dir)
+    if zip_errors:
+        for error in zip_errors:
+            flash(error, "alert-error")
         return render_template("index.html")
 
-    filename = secure_filename(text_file.filename)
-    if not os.path.exists(app.config["UPLOAD_FOLDER"]):
-        os.mkdir(app.config["UPLOAD_FOLDER"])
-
-    filepath = os.path.join(app.config["UPLOAD_FOLDER"], filename)
-    text_file.save(os.path.join(app.config["UPLOAD_FOLDER"], filename))
-
     return redirect(url_for(
         "parse.parse", filename=filename,
         filetype=request.form["filetype"]))