Allow getting just the integrity value

README.md

@@ -54,6 +54,10 @@ The SRI standard supports 3 algorithms: sha256, sha384 and sha512. By default, S
 
 The default algorithm can be changed by setting `SRI_ALGORITHM` to the required algorithm.
 
+### Just the integrity value
+
+To retrieve just the integrity hash (the contents of the `integrity` attribute), you can use the `{% sri_integrity %}` tag, which supports the same arguments as the other tags.
+
 ### _"Does this work with [whitenoise](https://whitenoise.evans.io/en/stable/) or alike?"_
 
 Yes. `django-sri` outputs the static file URL in the same way the builtin `static` template tag does. This means the correct cachebusted URLs are output.

sri/templatetags/sri.py

@@ -43,3 +43,8 @@ def sri_css(path, algorithm=DEFAULT_ALGORITHM):
 def sri(path, algorithm=DEFAULT_ALGORITHM):
     extension = os.path.splitext(path)[1][1:]
     return EXTENSIONS[extension](path, algorithm)
+
+
+@register.simple_tag
+def sri_integrity(path, algorithm=DEFAULT_ALGORITHM):
+    return calculate_integrity(get_static_path(path), algorithm)

tests/tests.py

@@ -115,3 +115,8 @@ def test_disable_sri(tag):
         assert "integrity" not in tag("index.js")
     finally:
         templatetags.USE_SRI = original_value
+
+
+@pytest.mark.parametrize("algorithm", utils.HASHERS.keys())
+def test_sri_integrity(algorithm):
+    assert templatetags.sri_integrity("index.js", algorithm).startswith(f"{algorithm}-")