misc: add |urljoin template filter (#51615)

tests/test_templates.py

@@ -188,6 +188,25 @@ def test_removesuffix_templatetag():
     assert tmpl.render({'foo': 'XYfoo barXYXY'}) == 'XYfoo barXY'
 
 
+def test_urljoin_templatefilter():
+    tmpl = Template('{{ foo|urljoin }}')
+    assert tmpl.render() == ''
+    assert tmpl.render({'foo': None}) == ''
+    assert tmpl.render({'foo': ''}) == ''
+    assert tmpl.render({'foo': 'http://example.com'}) == 'http://example.com'
+    assert tmpl.render({'foo': 'http://example.com/'}) == 'http://example.com/'
+
+    tmpl = Template('{{ foo|urljoin:bar }}')
+    assert tmpl.render({'foo': None, 'bar': None}) == ''
+    assert tmpl.render({'foo': None, 'bar': 'some/url'}) == 'some/url'
+    assert tmpl.render({'foo': 'http://example.com', 'bar': None}) == 'http://example.com'
+    assert tmpl.render({'foo': 'http://example.com', 'bar': 'some/url'}) == 'http://example.com/some/url'
+    assert tmpl.render({'foo': 'http://example.com/', 'bar': 'some/url'}) == 'http://example.com/some/url'
+    assert tmpl.render({'foo': 'http://example.com', 'bar': '/some/url'}) == 'http://example.com/some/url'
+    assert tmpl.render({'foo': 'http://example.com/', 'bar': '/some/url'}) == 'http://example.com/some/url'
+    assert tmpl.render({'foo': 'http://example.com/', 'bar': '/some/url'}) == 'http://example.com/some/url'
+
+
 def test_unaccent_templatetag():
     tmpl = Template('{{ foo|unaccent }}')
     assert tmpl.render() == ''

wcs/qommon/templatetags/qommon.py

@@ -23,6 +23,7 @@ import math
 import string
 import random
 import unicodedata
+import urllib.parse
 
 import pyproj
 from pyproj import Geod
@@ -121,6 +122,11 @@ def removesuffix(string, suffix=None):
     return value
 
 
+@register.filter
+def urljoin(base, path=None):
+    return urllib.parse.urljoin(base or '', path or '')
+
+
 @register.filter
 def unaccent(value):
     if not value: