feat(request handler): add initializeRequestInterceptor method

lib/core/requestHandler.js

@@ -1,8 +1,15 @@
+import ExpiredAuthSessionError from './includes/ExpiredAuthSessionError'
+
 export default class RequestHandler {
   constructor (auth) {
     this.$auth = auth
   }
 
+  _getUpdatedRequestConfig (config) {
+    config.headers[this.$auth.strategy.options.token.name] = this.$auth.token.get()
+    return config
+  }
+
   setHeader (token) {
     if (this.$auth.strategy.options.token.global) {
       // Set Authorization token for all axios requests
@@ -16,4 +23,29 @@ export default class RequestHandler {
       this.$auth.ctx.app.$axios.setHeader(this.$auth.strategy.options.token.name, false)
     }
   }
+
+  initializeRequestInterceptor () {
+    this.$auth.ctx.app.$axios.onRequest(async config => {
+      // Sync token
+      const token = this.$auth.token.sync()
+
+      // Get status
+      const tokenStatus = this.$auth.token.status()
+
+      // If no token, bail
+      if (!token) {
+        return config
+      }
+
+      // Token has expired. Force reset.
+      if (tokenStatus.expired()) {
+        await this.$auth.reset()
+
+        throw new ExpiredAuthSessionError()
+      }
+
+      // Token is still valid. Fetch updated token and add to current request
+      return this._getUpdatedRequestConfig(config)
+    })
+  }
 }