feat: add openingBlock method to Blockchain

tixl · Feb 6, 2020 · 815562e · 815562e
1 parent aae54b4
commit 815562e
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/src/Blockchain.ts b/src/Blockchain.ts
@@ -1,4 +1,4 @@
-import { Block, fromBlockObject } from './Block';
+import { Block, fromBlockObject, BlockType } from './Block';
 import { SigPublicKey, NTRUPublicKey } from './Keys';
 import { StorageId } from './Storage';
 
@@ -22,6 +22,14 @@ export class Blockchain {
     const prevs = this.blocks.map(block => block.prev).filter(prev => !!prev);
     return this.blocks.find(block => prevs.indexOf(block.signature) === -1);
   }
+
+  openingBlock(): Block | undefined {
+    if (!Array.isArray(this.blocks)) {
+      return;
+    }
+
+    return this.blocks.filter(block => block.type === BlockType.OPENING && !block.prev).pop();
+  }
 }
 
 export function fromBlockchainObject(obj: any) {