Speed up processing by reusing cached nonce

weespin · Mar 14, 2022 · 21deb72 · 21deb72
1 parent 626a599
commit 21deb72
Showing 1 changed file with 45 additions and 26 deletions.
diff --git a/AcapellaDownloader/Utils.cs b/AcapellaDownloader/Utils.cs
@@ -12,7 +12,10 @@ public static class Utils
    {
 	    private const string _NonceEndpoint = "https://acapelavoices.acapela-group.com/index/getnonce/";
         private const string _SynthesizerEndpoint = "http://www.acapela-group.com:8080/webservices/1-34-01-Mobility/Synthesizer";
-        public static string GetSoundLink(string text, string voiceid)
+        private static string _CachedNonce = "";
+        private static string _CachedEmail = "";
+        private static bool _LastFailed = false;
+        public static bool UpdateNonceToken()
         {
             HttpClient httpClient = new HttpClient();
             Random random = new Random();
@@ -24,48 +27,64 @@ public static string GetSoundLink(string text, string voiceid)
             {
                 fakeEmail.Append((char)(random.Next(1, 26) + 64));
             }
+
             fakeEmail.Append("@gmail.com");
 
             var nonceRequestValues = new Dictionary<string, string>
             {
-                {"json", "{\"googleid\":\"" + fakeEmail.ToString() + "\"}"}
+                { "json", "{\"googleid\":\"" + fakeEmail.ToString() + "\"}" }
 
             };
 
             var nonceRequestContent = new FormUrlEncodedContent(nonceRequestValues);
-            var nonceResponse = httpClient.PostAsync(_NonceEndpoint, nonceRequestContent).Result.Content.ReadAsStringAsync().Result;
+            var nonceResponse = httpClient.PostAsync(_NonceEndpoint, nonceRequestContent).Result.Content
+                .ReadAsStringAsync().Result;
             var nonceRegex = new Regex(@"^\{\""nonce\""\:\""(.+)\""\}$");
             var nonceRegexMatch = nonceRegex.Match(nonceResponse);
-
             if (nonceRegexMatch.Groups.Count > 1)
             {
-                var synthesizerRequest = (HttpWebRequest)WebRequest.Create(_SynthesizerEndpoint);
-                var synthesizerRequestString = $"req_voice={voiceid}&cl_pwd=&cl_vers=1-30&req_echo=ON&cl_login=AcapelaGroup&req_comment=%7B%22nonce%22%3A%22{nonceRegexMatch.Groups[1]}%22%2C%22user%22%3A%22{fakeEmail}%22%7D&req_text={Uri.EscapeDataString(text)}&cl_env=ACAPELA_VOICES&prot_vers=2&cl_app=AcapelaGroup_WebDemo_Android";
-                var data = Encoding.ASCII.GetBytes(synthesizerRequestString);
-                synthesizerRequest.Method = "POST";
-                synthesizerRequest.ContentType = "application/x-www-form-urlencoded";
-                synthesizerRequest.ContentLength = data.Length;
+                _CachedNonce = nonceRegexMatch.Groups[1].Value;
+                _CachedEmail = fakeEmail.ToString();
+                _LastFailed = false;
+                return true;
+            }
 
-                using (var stream = synthesizerRequest.GetRequestStream())
-                {
-                    stream.Write(data, 0, data.Length);
-                }
+            return false;
+        }
 
-                var synthesizerResponseStream = synthesizerRequest.GetResponse().GetResponseStream();
-                if (synthesizerResponseStream == null)
-                {
-	                return "";
-                }
-                var synthesizerResponseString = new StreamReader(synthesizerResponseStream).ReadToEnd();
-                var synthesizerRegex = new Regex("snd_url=(.+)&snd_size");
-                var synthesizerMatch = synthesizerRegex.Match(synthesizerResponseString);
+        public static string GetSoundLink(string text, string voiceid)
+        {
+            if (_CachedEmail == "" || _CachedNonce == "" || _LastFailed)
+            {
+                UpdateNonceToken();
+            }
+            var synthesizerRequest = (HttpWebRequest)WebRequest.Create(_SynthesizerEndpoint);
+            var synthesizerRequestString = $"req_voice={voiceid}&cl_pwd=&cl_vers=1-30&req_echo=ON&cl_login=AcapelaGroup&req_comment=%7B%22nonce%22%3A%22{_CachedNonce}%22%2C%22user%22%3A%22{_CachedEmail}%22%7D&req_text={Uri.EscapeDataString(text)}&cl_env=ACAPELA_VOICES&prot_vers=2&cl_app=AcapelaGroup_WebDemo_Android";
+            var data = Encoding.ASCII.GetBytes(synthesizerRequestString);
+            synthesizerRequest.Method = "POST";
+            synthesizerRequest.ContentType = "application/x-www-form-urlencoded";
+            synthesizerRequest.ContentLength = data.Length;
+
+            using (var stream = synthesizerRequest.GetRequestStream())
+            {
+                stream.Write(data, 0, data.Length);
+            }
 
-                if (synthesizerMatch.Success)
-                {
-                    return synthesizerMatch.Groups[1].Value;
-                }
+            var synthesizerResponseStream = synthesizerRequest.GetResponse().GetResponseStream();
+            if (synthesizerResponseStream == null)
+            { 
+                _LastFailed = true; 
                 return "";
             }
+            var synthesizerResponseString = new StreamReader(synthesizerResponseStream).ReadToEnd();
+            var synthesizerRegex = new Regex("snd_url=(.+)&snd_size");
+            var synthesizerMatch = synthesizerRegex.Match(synthesizerResponseString);
+
+            if (synthesizerMatch.Success)
+            {
+                return synthesizerMatch.Groups[1].Value;
+            }
+            _LastFailed = true;
             return "";
         }
     }