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diff --git a/swh/model/identifiers.py b/swh/model/identifiers.py
--- a/swh/model/identifiers.py
+++ b/swh/model/identifiers.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2019 The Software Heritage developers
+# Copyright (C) 2015-2020 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
@@ -7,6 +7,7 @@
import datetime
from functools import lru_cache
import hashlib
+import re
from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
import attr
@@ -823,6 +824,9 @@
a named tuple holding the parsing result
"""
+ if re.search(r"[ \t\n\r\f\v]", swhid):
+ raise ValidationError("Invalid SwHID: SWHIDs cannot contain whitespaces")
+
# <swhid>;<contextual-information>
swhid_parts = swhid.split(SWHID_CTXT_SEP)
swhid_data = swhid_parts.pop(0).split(":")
diff --git a/swh/model/tests/test_identifiers.py b/swh/model/tests/test_identifiers.py
--- a/swh/model/tests/test_identifiers.py
+++ b/swh/model/tests/test_identifiers.py
@@ -1069,6 +1069,23 @@
"swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;origin=something;anchor=1;visit=1;pa=/", # noqa
# wrong qualifier: line should be lines
"swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;line=10;origin=something;anchor=1;visit=1;path=/", # noqa
+ # wrong qualifier value: it contains space before of after
+ "swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;origin= https://some-url", # noqa
+ "swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;origin=something;anchor=some-anchor ", # noqa
+ "swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;origin=something;anchor=some-anchor ;visit=1", # noqa
+ # invalid swhid: whitespaces
+ "swh :1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;ori=something;anchor=1;visit=1;path=/", # noqa
+ "swh: 1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;ori=something;anchor=1;visit=1;path=/", # noqa
+ "swh: 1: dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;ori=something;anchor=1;visit=1;path=/", # noqa
+ "swh:1: dir: 0b6959356d30f1a4e9b7f6bca59b9a336464c03d",
+ "swh:1: dir: 0b6959356d30f1a4e9b7f6bca59b9a336464c03d; origin=blah",
+ "swh:1: dir: 0b6959356d30f1a4e9b7f6bca59b9a336464c03d;lines=12",
+ # other whitespaces
+ "swh\t:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;lines=12",
+ "swh:1\n:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;lines=12",
+ "swh:1:\rdir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;lines=12",
+ "swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d\f;lines=12",
+ "swh:1:dir:0b6959356d30f1a4e9b7f6bca59b9a336464c03d;lines=12\v",
],
)
def test_parse_swhid_parsing_error(invalid_swhid):

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