Require URL scheme for the WrapDB server address

Extend source address to accept other protocols. urllib can work with
http(s), file, ftp protocols, so this sould work, but type annotations
are not correct for the latter two. And due to enforcement of the https for
secure connections protocol selection options are still limited.

mesonbuild/wrap/wrap.py

@@ -50,48 +50,58 @@
 
 REQ_TIMEOUT = 30.0
 WRAPDB_UPSTREAM_HOSTNAME = 'wrapdb.mesonbuild.com'
+WRAPDB_UPSTREAM_ADDRESS = f'https://{WRAPDB_UPSTREAM_HOSTNAME}'
 
 ALL_TYPES = ['file', 'git', 'hg', 'svn', 'redirect']
 
 PATCH = shutil.which('patch')
 
 @lru_cache(maxsize=None)
-def wrapdb_netloc() -> str:
+def wrapdb_source() -> str:
     try:
-        with Path('subprojects/wrapdb-mirrors.json').open('r', encoding='utf-8') as f:
-            mirrorlist = json.load(f)
-            version = mirrorlist['version']
+        with Path('subprojects/wrapdb-sources.json').open('r', encoding='utf-8') as f:
+            config = json.load(f)
+            version = config['version']
             if version > 1:
-                m = f'WrapDB mirrors file (v{version}) was created with the newer version of meson'
+                m = f'WrapDB sources file (v{version}) was created with a newer version of meson.'
                 raise WrapException(m)
-            return str(mirrorlist['mirrors'][0])
+            source = str(config['sources'][0])
+            url = urllib.parse.urlparse()
+            if not url.scheme:
+                m = f'WrapDB source address requires a protocol scheme, like `{WRAPDB_UPSTREAM_ADDRESS}`.'
+                raise WrapException(m)
+            return source
     except FileNotFoundError:
-        return WRAPDB_UPSTREAM_HOSTNAME
+        return WRAPDB_UPSTREAM_ADDRESS
 
 def is_trusted_subdomain(hostname: str) -> bool:
     trusted_subdomains = {
         WRAPDB_UPSTREAM_HOSTNAME,
-        urllib.parse.urlparse(f'//{wrapdb_netloc()}').hostname,
+        urllib.parse.urlparse(wrapdb_source()).hostname,
     }
     for entry in trusted_subdomains:
         if hostname.endswith(entry):
             return True
 
     return False
 
-def expand_wrapdburl(urlstr: str) -> urllib.parse.ParseResult:
-    """ raises WrapException if not whitelisted subdomain """
+def expand_wrapdburl(urlstr: str, allow_insecure: bool = False) -> urllib.parse.ParseResult:
     url = urllib.parse.urlparse(urlstr)
     if url.scheme == 'wrapdb':
         if url.netloc:
             raise WrapException(f'{urlstr} with wrapdb: scheme should not have a netloc')
-        url = url._replace(scheme='https', netloc=wrapdb_netloc())
+        # append wrapdb path on top of the source address
+        rel_path = url.path.lstrip('/')
+        url = urllib.parse.urlparse(urllib.parse.urljoin(wrapdb_source(), rel_path))
+
     if not url.hostname:
-        raise WrapException(f'{urlstr} is not a valid URL')
-    if not is_trusted_subdomain(url.hostname):
-        raise WrapException(f'{urlstr} is not a whitelisted WrapDB URL')
-    if has_ssl and not url.scheme == 'https':
-        raise WrapException(f'WrapDB did not have expected SSL https url, instead got {urlstr}')
+        if url.scheme not in {'file'}:
+            raise WrapException(f'{urlstr} is not a valid URL')
+    else:
+        if not is_trusted_subdomain(url.hostname):
+            raise WrapException(f'{urlstr} is not a whitelisted WrapDB URL')
+        if has_ssl and not allow_insecure and not url.scheme == 'https':
+            raise WrapException(f'WrapDB did not have expected SSL https url, instead got {urlstr}')
     return url
 
 def open_wrapdburl(urlstring: str, allow_insecure: bool = False, have_opt: bool = False) -> 'http.client.HTTPResponse':
@@ -100,7 +110,7 @@ def open_wrapdburl(urlstring: str, allow_insecure: bool = False, have_opt: bool
     else:
         insecure_msg = ''
 
-    url = expand_wrapdburl(urlstring)
+    url = expand_wrapdburl(urlstring, allow_insecure)
     if has_ssl:
         urlstring_ = urllib.parse.urlunparse(url)
         try:
@@ -121,10 +131,16 @@ def open_wrapdburl(urlstring: str, allow_insecure: bool = False, have_opt: bool
         mlog.warning(f'SSL module not available in {sys.executable}: WrapDB traffic not authenticated.', once=True)
 
     # If we got this far, allow_insecure was manually passed
-    nossl_url = url._replace(scheme='http')
-    urlstring_ = urllib.parse.urlunparse(nossl_url)
+    if has_ssl:
+        ctx = ssl.create_default_context()
+        ctx.check_hostname = False
+        ctx.verify_mode = ssl.CERT_NONE
+    else:
+        ctx = None
+        # e.g. https:// -> http://
+        urlstring_ = urlstring_.replace('s://', '://', 1)
     try:
-        return T.cast('http.client.HTTPResponse', urllib.request.urlopen(urlstring_, timeout=REQ_TIMEOUT))
+        return T.cast('http.client.HTTPResponse', urllib.request.urlopen(urlstring_, timeout=REQ_TIMEOUT, context=ctx))
     except OSError as excp:
         raise WrapException(f'WrapDB connection failed to {urlstring_} with error {excp}')