Add support for severity range (#1179)

Signed-off-by: ziadhany <ziadhany2016@gmail.com>

vulnerabilities/templates/vulnerability_details.html

@@ -81,6 +81,13 @@
                                     <td class="two-col-right wrap-strings">{{ vulnerability.summary }}
                                     </td>
                                 </tr>
+                                {% if severity_score_range %}
+                                <tr>
+                                    <td class="two-col-left">Severity score range</td>
+                                    <td class="two-col-right">{{ severity_score_range }}
+                                    </td>
+                                {% endif %}
+                                </tr>
                             </tbody>
                         </table>
                     </div>

vulnerabilities/utils.py

@@ -502,3 +502,30 @@ def is_vulnerable_nginx_version(version, affected_version_range, fixed_versions)
                 return False
         return True
     return False
+
+
+def get_severity_range(severity_list):
+    """
+    >>> get_severity_range({'LOW','7.5','5'})
+    '0.1 - 7.5'
+    >>> get_severity_range({'LOW','Medium'})
+    '0.1 - 6.9'
+    >>> get_severity_range({'9.5','critical'})
+    '9.0 - 10.0'
+    """
+    if len(severity_list) > 1:
+        score_map = {
+            "low": [0.1, 3],
+            "moderate": [4.0, 6.9],
+            "medium": [4.0, 6.9],
+            "high": [7.0, 8.9],
+            "critical": [9.0, 10.0],
+        }
+
+        score_list = []
+        for score in severity_list:
+            try:
+                score_list.append(float(score))
+            except ValueError:
+                score_list.extend(score_map[score.lower()])
+        return f"{min(score_list)} - {max(score_list)}"

vulnerabilities/views.py

@@ -24,6 +24,7 @@
 from vulnerabilities.forms import PackageSearchForm
 from vulnerabilities.forms import VulnerabilitySearchForm
 from vulnerabilities.models import Weakness
+from vulnerabilities.utils import get_severity_range
 from vulnerablecode.settings import env
 
 PAGE_SIZE = 20
@@ -125,6 +126,9 @@ def get_context_data(self, **kwargs):
                 "vulnerability": self.object,
                 "vulnerability_search_form": VulnerabilitySearchForm(self.request.GET),
                 "severities": list(self.object.severities),
+                "severity_score_range": get_severity_range(
+                    {s.value for s in self.object.severities}
+                ),
                 "references": self.object.references.all(),
                 "aliases": self.object.aliases.all(),
                 "affected_packages": self.object.affected_packages.all(),