[text] add 'build_query()'

gallery_dl/text.py

@@ -289,12 +289,19 @@ def parse_query_list(qs, as_list=()):
                     else:
                         result[name] = [value]
                 elif name not in result:
-                    result[name] = unquote(value.replace("+", " "))
+                    result[name] = value
     except Exception:
         pass
     return result
 
 
+def build_query(params):
+    return "&".join([
+        f"{quote(name)}={quote(value)}"
+        for name, value in params.items()
+    ])
+
+
 if sys.hexversion < 0x30c0000:
     # Python <= 3.11
     def parse_timestamp(ts, default=None):

test/test_text.py

@@ -456,6 +456,8 @@ class TestText(unittest.TestCase):
         self.assertEqual(f(""), {})
         self.assertEqual(f("foo=1"), {"foo": "1"})
         self.assertEqual(f("foo=1&bar=2"), {"foo": "1", "bar": "2"})
+        self.assertEqual(f("%C3%A4%26=%E3%81%82%E3%81%A8&%23=%3F"),
+                         {"ä&": "あと", "#": "?"})
 
         # missing value
         self.assertEqual(f("bar"), {})
@@ -473,6 +475,21 @@ class TestText(unittest.TestCase):
         for value in INVALID:
             self.assertEqual(f(value), {})
 
+    def test_build_query(self, f=text.build_query):
+        # standard usage
+        self.assertEqual(f({}), "")
+        self.assertEqual(f({"foo": "1"}), "foo=1")
+        self.assertEqual(f({"foo": "1", "bar": "2"}), "foo=1&bar=2")
+
+        # missing value
+        self.assertEqual(f({"bar": ""}), "bar=")
+        self.assertEqual(f({"foo": "1", "bar": ""}), "foo=1&bar=")
+        self.assertEqual(f({"foo": "1", "bar": "", "baz": "3"}),
+                         "foo=1&bar=&baz=3")
+
+        self.assertEqual(f({"ä&": "あと", "#": "?"}),
+                         "%C3%A4%26=%E3%81%82%E3%81%A8&%23=%3F")
+
     def test_parse_timestamp(self, f=text.parse_timestamp):
         null = util.datetime_utcfromtimestamp(0)
         value = util.datetime_utcfromtimestamp(1555816235)