fix(wx): remove bogus Origin from API requests

For some reason `js-ipfs-api` sends requests with "Origin: null"
under Chrom which produces '403 - Forbidden' error.
This workaround removes bogus header from API requests

Part of #218 effort

add-on/src/lib/common.js

@@ -48,6 +48,7 @@ function updatePeerCountState (count) {
 }
 
 function registerListeners () {
+  browser.webRequest.onBeforeSendHeaders.addListener(onBeforeSendHeaders, {urls: ['<all_urls>']}, ['blocking', 'requestHeaders'])
   browser.webRequest.onBeforeRequest.addListener(onBeforeRequest, {urls: ['<all_urls>']}, ['blocking'])
   browser.storage.onChanged.addListener(onStorageChange)
   browser.tabs.onUpdated.addListener(onUpdatedTab)
@@ -94,6 +95,27 @@ function redirectToNormalizedPath (request) {
   return { redirectUrl: url.toString() }
 }
 
+// HTTP Request Hooks
+// ===================================================================
+
+function onBeforeSendHeaders (request) {
+  if (request.url.startsWith(state.apiURLString)) {
+    // For some reason js-ipfs-api sent requests with "Origin: null" under Chrome
+    // which produced '403 - Forbidden' error.
+    // This workaround removes bogus header from API requests
+    for (var i = 0; i < request.requestHeaders.length; i++) {
+      let header = request.requestHeaders[i]
+      if (header.name === 'Origin' && (header.value == null || header.value === 'null')) {
+        request.requestHeaders.splice(i, 1)
+        break
+      }
+    }
+  }
+  return {
+    requestHeaders: request.requestHeaders
+  }
+}
+
 function onBeforeRequest (request) {
   if (request.url.startsWith('https://ipfs.io/web%2B')) {
     // fix path passed via custom protocol

test/unit/00-init.test.js

@@ -117,5 +117,4 @@ describe('init.js', function () {
         .catch(error => { done(error) })
     })
   })
-
 })