fix: mangled scrape infohashes (webtorrent#486)

Author: ThaUnknown

lib/client/http-tracker.js

@@ -4,7 +4,7 @@ import clone from 'clone'
 import Debug from 'debug'
 import get from 'simple-get'
 import Socks from 'socks'
-import { bin2hex, hex2bin, arr2text } from 'uint8-util'
+import { bin2hex, hex2bin, arr2text, text2arr, arr2hex } from 'uint8-util'
 
 import common from '../common.js'
 import Tracker from './tracker.js'
@@ -244,12 +244,14 @@ class HTTPTracker extends Tracker {
       return
     }
 
-    keys.forEach(infoHash => {
+    keys.forEach(_infoHash => {
       // TODO: optionally handle data.flags.min_request_interval
       // (separate from announce interval)
-      const response = Object.assign(data[infoHash], {
+      const infoHash = _infoHash.length !== 20 ? arr2hex(text2arr(_infoHash)) : bin2hex(_infoHash)
+
+      const response = Object.assign(data[_infoHash], {
         announce: this.announceUrl,
-        infoHash: bin2hex(infoHash)
+        infoHash
       })
       this.client.emit('scrape', response)
     })