encoding: add JSON interface for asn1 and x509

lib/encoding/asn1.js

@@ -559,6 +559,32 @@ class Any extends Node {
       node: this.node
     };
   }
+
+  getJSON() {
+    if (this.opt && !this.force)
+      return null;
+
+    return {
+      type: this.node.constructor.name,
+      node: this.node.getJSON()
+    };
+  }
+
+  fromJSON(json) {
+    if (!json)
+      return null;
+
+    if (this.opt)
+      this.force = true;
+
+    const type = types[json.type.toUpperCase()];
+    const Node = typeToClass(type);
+    this.node = new Node();
+    this.node.fromJSON(json.node);
+    this.node.flags = this.flags;
+
+    return this.node;
+  }
 }
 
 /**
@@ -645,6 +671,23 @@ class Choice extends Node {
       node: this.node
     };
   }
+
+  getJSON() {
+    return {
+      type: this.node.constructor.name,
+      node: this.node.getJSON()
+    };
+  }
+
+  fromJSON(json) {
+    const type = types[json.type.toUpperCase()];
+    const Node = typeToClass(type);
+    this.node = new Node();
+    this.node.fromJSON(json.node);
+    this.node.flags = this.flags;
+
+    return this.node;
+  }
 }
 
 /**
@@ -717,6 +760,17 @@ const Str = class String extends Node {
   format() {
     return `<${this.constructor.name}: ${this.value}>`;
   }
+
+  getJSON() {
+    return this.value;
+  }
+
+  fromJSON(json) {
+    assert(typeof json === 'string');
+    this.value = json;
+
+    return this;
+  }
 };
 
 /**
@@ -775,6 +829,17 @@ const Bool = class Boolean extends Node {
   format() {
     return `<${this.constructor.name}: ${this.value}>`;
   }
+
+  getJSON() {
+    return this.value;
+  }
+
+  fromJSON(json) {
+    assert(typeof json === 'boolean');
+    this.value = json;
+
+    return this;
+  }
 };
 
 /**
@@ -978,6 +1043,21 @@ class Integer extends Node {
 
     return `<${name}: ${sign}0x${hex}>`;
   }
+
+  getJSON() {
+    return {
+      value: this.value.toString('hex'),
+      negative: this.negative
+    };
+  }
+
+  fromJSON(json) {
+    assert(typeof json.negative === 'boolean');
+    this.value = Buffer.from(json.value, 'hex');
+    this.negative = json.negative;
+
+    return this;
+  }
 }
 
 /**
@@ -1019,6 +1099,14 @@ class Unsigned extends Integer {
     assert(!this.negative);
     return this;
   }
+
+  getJSON() {
+    return this.toNumber();
+  }
+
+  fromJSON(json) {
+    return this.fromNumber(json);
+  }
 }
 
 /**
@@ -1144,6 +1232,21 @@ class BitString extends Node {
 
     return `<${this.constructor.name}: ${this.bits}:${value.toString('hex')}>`;
   }
+
+  getJSON() {
+    return {
+      bits: this.bits,
+      value: this.value.toString('hex')
+    };
+  }
+
+  fromJSON(json) {
+    assert(typeof json.bits === 'number');
+    this.bits = json.bits;
+    this.value = Buffer.from(json.value, 'hex');
+
+    return this;
+  }
 }
 
 /**
@@ -1198,6 +1301,16 @@ class OctString extends Node {
 
     return `<${this.constructor.name}: ${value.toString('hex')}>`;
   }
+
+  getJSON() {
+    return this.value.toString('hex');
+  }
+
+  fromJSON(json) {
+    this.value = Buffer.from(json, 'hex');
+
+    return this;
+  }
 }
 
 /**
@@ -1236,6 +1349,14 @@ class Null extends Node {
   format() {
     return `<${this.constructor.name}>`;
   }
+
+  getJSON() {
+    return null;
+  }
+
+  fromJSON(json) {
+    return this;
+  }
 }
 
 /**
@@ -1460,6 +1581,22 @@ class OID extends Node {
 
     return `<${this.constructor.name}: ${str}>`;
   }
+
+  getJSON() {
+    const oid = this.toString();
+    const name = objects.attrsByVal[oid]
+              || objects.sigAlgsByVal[oid]
+              || objects.keyAlgsByVal[oid]
+              || objects.hashesByVal[oid]
+              || objects.curvesByVal[oid]
+              || objects.extensionsByVal[oid]
+              || this.toString();
+    return name;
+  }
+
+  fromJSON(json) {
+    return this.fromString(json);
+  }
 }
 
 /**
@@ -1580,6 +1717,14 @@ class RawSequence extends Node {
   format() {
     return this.toArray();
   }
+
+  getJSON() {
+    throw new Error('Not implemented.');
+  }
+
+  fromJSON(json) {
+    throw new Error('Not implemented.');
+  }
 }
 
 /**
@@ -1727,6 +1872,14 @@ class Time extends Node {
 
     return `<${name}: ${value}${off} (${this.toString()})>`;
   }
+
+  getJSON() {
+    return this.toString();
+  }
+
+  fromJSON(json) {
+    return this.fromString(json);
+  }
 }
 
 /**