Plugins: Modify interface for plugin validations to allow taking PDC into account (#96089)

* Request interceptor: Do not block PDC

* Apply change after feedback received

* Add test

* Check if secure socks proxy configured for the instance

* Apply suggestions from code review

* Add dedicated service for datasource request URL validation (#99179)

---------

Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>

pkg/services/datasources/models_test.go

@@ -102,3 +102,58 @@ func TestTeamHTTPHeaders(t *testing.T) {
 		})
 	}
 }
+
+func TestIsSecureSocksDSProxyEnabled(t *testing.T) {
+	testCases := []struct {
+		desc string
+		ds   *DataSource
+		want bool
+	}{
+		{
+			desc: "Empty json",
+			ds: &DataSource{
+				JsonData: simplejson.New(),
+			},
+			want: false,
+		},
+		{
+			desc: "Json with enableSecureSocksProxy",
+			ds: &DataSource{
+				JsonData: simplejson.NewFromAny(map[string]interface{}{
+					"enableSecureSocksProxy": true,
+				}),
+			},
+			want: true,
+		},
+		{
+			desc: "Json with string enableSecureSocksProxy",
+			ds: &DataSource{
+				JsonData: simplejson.NewFromAny(map[string]interface{}{
+					"enableSecureSocksProxy": "true",
+				}),
+			},
+			want: false,
+		},
+		{
+			desc: "Json with enableSecureSocksProxy false",
+			ds: &DataSource{
+				JsonData: simplejson.NewFromAny(map[string]interface{}{
+					"enableSecureSocksProxy": false,
+				}),
+			},
+			want: false,
+		},
+		{
+			desc: "Json with no json data",
+			ds:   &DataSource{},
+			want: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			actual := tc.ds.IsSecureSocksDSProxyEnabled()
+			assert.Equal(t, tc.want, actual)
+		})
+	}
+}