replaced old 'self.config[releases]' with new 'self.config[distros][distro][archs][arch]'

to get determinate dict with all the required keys due to the latest changes in downloads.toml

replaced md5 with sha256 and http with https

Fixes: #16

uitwww/download.py

 # Source code of the Ubuntu-it website
 # Copyright (C) 2016  Pietro Albini <pietroalbini@ubuntu.com>
+# Copyright (C) 2023  shadMod
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published
@@ -75,6 +76,8 @@ class Downloads:
                     found_mirrors = list(sorted(launchpad.get_cdimage_mirrors(
                         distro, self.config["mirrors"]["country"]
                     )))
+                    if "it1.mirror.vhosting-it.com" in found_mirrors[0]:
+                        found_mirrors = ["https://releases.ubuntu.com/"]
                     if found_mirrors:
                         self._mirrors[distro] = found_mirrors
                 if not self._mirrors:
@@ -85,14 +88,14 @@ class Downloads:
         return self._mirrors
 
     @property
-    def md5sums(self):
-        """Get a list of all the MD5SUMS"""
-        if not hasattr(self, "_md5sums"):
+    def sha256sums(self):
+        """Get a list of all the SHA256SUMS"""
+        if getattr(self, "_sha256sums") is None:
             if self._cache is not None:
-                self._md5sums = self._cache["md5sums"]
+                self._sha256sums = self._cache["sha256sums"]
             else:
-                self._md5sums = self._fetch_md5sums()
-        return self._md5sums
+                self._sha256sums = self._fetch_sha256sums()
+        return self._sha256sums
 
     def _strip_non_lts_releases(self):
         """Process the lts-only distro configuration"""
@@ -104,14 +107,14 @@ class Downloads:
                 if not self.config["releases"][release]["lts"]:
                     config["releases"].remove(release)
 
-    def _fetch_md5sums(self):
-        """Fetch all the needed MD5SUMS"""
+    def _fetch_sha256sums(self):
+        """Fetch all the needed SHA256SUMS"""
         result = {}
         files_content = {}
 
         for distro, config in self.config["distros"].items():
             for release in config["releases"]:
-                if config["lts-only"] and not self.config["releases"][release]["lts"]:
+                if config["lts-only"]:
                     continue
 
                 for arch in config["archs"].keys():
@@ -120,7 +123,7 @@ class Downloads:
 
                     # Fetch the file from the remote if it wasn't done already
                     if path not in files_content:
-                        md5s = {}
+                        sha_hash = {}
 
                         response = requests.get("%s/SHA256SUMS" % path)
                         if response.status_code == 404:
@@ -132,19 +135,19 @@ class Downloads:
                             if line.strip() == "":
                                 continue
 
-                            hash, name = line.split(" ", 1)
+                            _hash, name = line.split(" ", 1)
                             if name.startswith("*"):
                                 name = name[1:]
-                            md5s[name] = hash
-                        files_content[path] = md5s
+                            sha_hash[name] = _hash
+                        files_content[path] = sha_hash
 
-                    # Add the MD5 to the result if it was found
+                    # Add the SHA256 to the result if it was found
                     if file in files_content[path]:
                         key = "%s:%s:%s" % (distro, release, arch)
                         result[key] = files_content[path][file]
                     else:
                         print(files_content[path])
-                        raise RuntimeError("Missing MD5 for {}".format(file))
+                        raise RuntimeError("Missing SHA256SUMS for {}".format(file))
 
         return result
 
@@ -178,7 +181,7 @@ class Downloads:
                     "version": CACHE_FILE_VERSION,
                     "content": {
                         "mirrors": self.mirrors,
-                        "md5sums": self.md5sums,
+                        "sha256sums": self.sha256sums,
                     },
                 }, f, separators=(",", ":"))
 
@@ -188,12 +191,13 @@ class Downloads:
     def url_for(self, distro, release, arch, torrent=False, use_random=True):
         """Get the URL of a download file"""
         # Build the dict of keys to replace
+        data_rel = self.config["distros"][distro]["archs"][arch][release]
         replaces = {
             "distro": distro,
             "release": release,
             "arch": arch,
-            "version": self.config["releases"][release]["version"],
-            "codename": self.config["releases"][release]["codename"],
+            "version": data_rel["version"],
+            "codename": data_rel["codename"],
         }
 
         # Add mirrors to the replaces key
@@ -204,14 +208,14 @@ class Downloads:
                 replaces["mirror:%s" % name] = choices[0]
 
         # Get the right source
-        source_name = self.config["distros"][distro]["archs"][arch]
-        source = self.config["sources"][source_name]
+        host = data_rel["host"]
+        source = self.config["sources"][host]
 
         # Download URLs are different for torrent and HTTP
         if torrent:
             url = source["torrent"]
         else:
-            url = source["http"]
+            url = source["https"]
 
         for key, value in replaces.items():
             url = url.replace("{%s}" % key, value)
@@ -238,11 +242,12 @@ class Downloads:
             if distro not in self.config["distros"]:
                 flask.abort(404)
 
+            data = self.config["distros"][distro]
             return flask.render_template(
                 "download/landing.html",
                 distro_name=distro,
-                distro=self.config["distros"][distro],
-                releases=self.config["releases"],
+                distro=data,
+                releases=data["archs"]["amd64"],
                 archs=self.config["archs"],
             )
 
@@ -266,16 +271,19 @@ class Downloads:
 
             torrent = "torrent" in flask.request.form
 
-            payload = signer.dumps({
+            data_rel = self.config["distros"][distro]["archs"][arch][release]
+            payload = signer.dumps(
+                {
                     "url": self.url_for(distro, release, arch, torrent),
-                "md5": self.md5sums["%s:%s:%s" % (distro, release, arch)],
+                    "sha256": self.sha256sums[f"{distro}:{release}:{arch}"],
                     "name": "%s %s%s" % (
                         self.config["distros"][distro]["name"],
-                    self.config["releases"][release]["version"],
-                    " LTS" if self.config["releases"][release]["lts"] else "",
+                        data_rel["version"],
+                        " LTS" if data_rel["lts"] else "",
                     ),
                     "theme": distro,
-            })
+                }
+            )
             return flask.redirect(flask.url_for(".thanks", payload=payload))
 
         @bp.route("/grazie/<payload>")
@@ -293,10 +301,11 @@ class Downloads:
         """Generate the sub-navbar for /download"""
         result = []
         for name, distro in self.config["distros"].items():
-            result.append({
+            result.append(
+                {
                     "name": distro["name"],
                     "endpoint": "download.landing",
                     "endpoint-args": {"distro": name},
-            })
-
+                }
+            )
         return result