Added more fail safety for vulnerability export.

This should affect all exports when a vulnerability disappears.

app/models/vulnerabilityOverviews.scala

@@ -0,0 +1,49 @@
+package models
+
+import com.ysoft.odc.CWE
+import controllers.Vulnerability
+
+/**
+  * Provides some overview about vulnerability. It might be either covered by fully-detailed vulnerability or represent a vulnerability we know little or nothing about.
+  */
+abstract sealed class VulnerabilityOverview {
+  def name: String
+  def descriptionAttempt: String
+  def isSureAboutDescription: Boolean
+  def cvssScore: Option[Double]
+  def cweOption: Option[CWE]
+}
+
+object VulnerabilityOverview{
+  def apply(name: String, v: Option[Vulnerability]): VulnerabilityOverview = v.fold(UnknownVulnerabilityOverview(name))(new StandardVulnerabilityOverview(_))
+}
+
+final class StandardVulnerabilityOverview(vulnerability: Vulnerability) extends VulnerabilityOverview {
+  override def name: String = vulnerability.name
+  override def descriptionAttempt: String = vulnerability.description
+  override def isSureAboutDescription = true
+  override def cvssScore: Option[Double] = vulnerability.cvssScore
+  override def cweOption = vulnerability.cweOption
+}
+
+private final class UnknownVulnerabilityOverview(override val name: String, link: String) extends VulnerabilityOverview {
+  override def descriptionAttempt: String = s"Unknown vulnerability. Try looking at the following address for more details: $link"
+  override def cvssScore: Option[Double] = None
+  override def isSureAboutDescription = false
+  override def cweOption = None
+}
+
+private final class TotallyUnknownVulnerabilityOverview(override val name: String) extends VulnerabilityOverview {
+  override def descriptionAttempt: String = s"Unknown vulnerability. Not even sure where to look for other details. Maybe Googling the identifier will help."
+  override def cvssScore: Option[Double] = None
+  override def isSureAboutDescription = false
+  override def cweOption = None
+}
+
+private object UnknownVulnerabilityOverview {
+  def apply(name: String): VulnerabilityOverview = name match {
+    case cveId if name startsWith "CVE-" => new UnknownVulnerabilityOverview(name, s"https://nvd.nist.gov/vuln/detail/$cveId")
+    case ossIndexId if name startsWith "OSSINDEX-" => new UnknownVulnerabilityOverview(name, s"https://ossindex.net/resource/vulnerability/$ossIndexId")
+    case other => new TotallyUnknownVulnerabilityOverview(other)
+  }
+}