Ignore unknown properties when parsing JSON files.

Avoids parse issues with previously deprecated and later removed
fields like "as_number" in details documents.

CHANGELOG.md

+# Changes in version 7.0-1.18.1 - 2018-09-11
+
+ * Medium changes
+   - Ignore unknown properties when parsing JSON files, which includes
+     previously deprecated and later removed fields like "as_number"
+     in details documents.
+
+
 # Changes in version 7.0-1.18.0 - 2018-09-10
 
  * Medium changes

src/main/java/org/torproject/onionoo/docs/Document.java

@@ -4,6 +4,7 @@
 package org.torproject.onionoo.docs;
 
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy;
 import com.fasterxml.jackson.databind.annotation.JsonNaming;
@@ -18,6 +19,9 @@ import com.fasterxml.jackson.databind.annotation.JsonNaming;
     getterVisibility = JsonAutoDetect.Visibility.NONE,
     isGetterVisibility = JsonAutoDetect.Visibility.NONE,
     setterVisibility = JsonAutoDetect.Visibility.NONE)
+/* Ignore unknown properties including previously deprecated and later removed
+ * fields. */
+@JsonIgnoreProperties(ignoreUnknown = true)
 public abstract class Document {
 
   private transient String documentString;

src/main/java/org/torproject/onionoo/docs/GraphHistory.java

@@ -4,6 +4,7 @@
 package org.torproject.onionoo.docs;
 
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.databind.PropertyNamingStrategy;
 import com.fasterxml.jackson.databind.annotation.JsonNaming;
@@ -20,6 +21,9 @@ import java.util.List;
     getterVisibility = JsonAutoDetect.Visibility.NONE,
     isGetterVisibility = JsonAutoDetect.Visibility.NONE,
     setterVisibility = JsonAutoDetect.Visibility.NONE)
+/* Ignore unknown properties including previously deprecated and later removed
+ * fields. */
+@JsonIgnoreProperties(ignoreUnknown = true)
 public class GraphHistory {
 
   private String first;