Refactor contribution serializer and validation

lib/serializers/contribution.js

@@ -1,45 +1,24 @@
+const schemas = require('kosmos-schemas');
+const validator = require('../utils/validator');
+
 /**
- * Handle serialization for JSON-LD object of the contribution, according to
- * https://github.com/67P/kosmos-schemas/blob/master/schemas/contribution.json
+ * Serialization and validation for JSON-LD document of the contribution.
  *
  * @class
  * @public
  */
 class Contribution {
- /**
-  * Deserialize JSON to object
-  *
-  * @method
-  * @public
-  */
-  static deserialize(serialized) {
-    let {
-      date,
-      time,
-      kind,
-      description,
-      details,
-      url,
-    } = JSON.parse(serialized.toString('utf8'));
 
-    return {
-      date,
-      time,
-      kind,
-      description,
-      details,
-      url,
-      ipfsData: serialized,
-    };
+  constructor(attrs) {
+    Object.keys(attrs).forEach(a => this[a] = attrs[a]);
   }
 
- /**
-  * Serialize object to JSON
-  *
-  * @method
-  * @public
-  */
-  static serialize(deserialized) {
+  /**
+   * Serialize object to JSON
+   *
+   * @public
+   */
+  serialize () {
     let {
       contributorIpfsHash,
       date,
@@ -48,7 +27,7 @@ class Contribution {
       description,
       url,
       details
-    } = deserialized;
+    } = this;
 
     let data = {
       "@context": "https://schema.kosmos.org",
@@ -70,6 +49,44 @@ class Contribution {
     // Write it pretty to ipfs
     return JSON.stringify(data, null, 2);
   }
+
+  /**
+   * Validate serialized data against schema
+   *
+   * @public
+   */
+  validate () {
+    const serialized = JSON.parse(this.serialize());
+    const valid = validator.validate(serialized, schemas['contribution']);
+    return valid ? Promise.resolve() : Promise.reject(validator.error);
+  }
+
+  /**
+   * Deserialize JSON to object
+   *
+   * @public
+   */
+  static deserialize (serialized) {
+    let {
+      date,
+      time,
+      kind,
+      description,
+      details,
+      url,
+    } = JSON.parse(serialized.toString('utf8'));
+
+    return {
+      date,
+      time,
+      kind,
+      description,
+      details,
+      url,
+      ipfsData: serialized,
+    };
+  }
+
 }
 
 module.exports = Contribution;