Completed steps up to downloading forge universal jar for 1.8-1.12.

Next step is processing the version.json and transforming it into a deliverable module.

src/resolver/baseresolver.ts

@@ -1,8 +1,17 @@
 import { Module } from '../model/spec/module'
+import { VersionUtil } from '../util/versionutil'
 import { Resolver } from './resolver'
 
 export abstract class BaseResolver implements Resolver {
 
+    protected static isVersionAcceptable(version: string, acceptable: number[]): boolean {
+        const versionComponents = VersionUtil.getMinecraftVersionComponents(version)
+        if (versionComponents != null && versionComponents.major === 1) {
+            return acceptable.find((element) => versionComponents.minor === element) != null
+        }
+        return false
+    }
+
     constructor(
         protected absoluteRoot: string,
         protected relativeRoot: string
@@ -10,4 +19,6 @@ export abstract class BaseResolver implements Resolver {
 
     public abstract getModule(): Promise<Module>
 
+    public abstract isForVersion(version: string): boolean
+
 }