From c1d0fe75d267f33724c38af95efc7b1c050dc160 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Thu, 17 Jun 2021 08:54:00 +0200
Subject: Temporary abort on fail to read file.. if its being modified while
 reading

---
 src/plugins/youtube/Signature.cpp | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

(limited to 'src/plugins/youtube/Signature.cpp')

diff --git a/src/plugins/youtube/Signature.cpp b/src/plugins/youtube/Signature.cpp
index 8c87817..7631182 100644
--- a/src/plugins/youtube/Signature.cpp
+++ b/src/plugins/youtube/Signature.cpp
@@ -4,6 +4,7 @@
 #include "../../../include/DownloadUtils.hpp"
 #include "../../../include/StringUtils.hpp"
 #include "../../../include/Program.hpp"
+#include "../../../include/NetUtils.hpp"
 #include <regex>
 #include <mutex>
 #include <unistd.h>
@@ -18,6 +19,26 @@ namespace QuickMedia {
     static std::mutex update_signature_mutex;
     static const int timeout_default_sec = 60 * 5; // 5 minutes
 
+    static bool is_whitespace(char c) {
+        switch(c) {
+            case ' ':
+            case '\r':
+            case '\n':
+            case '\t':
+                return true;
+        }
+        return false;
+    }
+
+    static std::string remove_whitespaces(const std::string &str) {
+        std::string result;
+        for(char c : str) {
+            if(!is_whitespace(c))
+                result += c;
+        }
+        return result;
+    }
+
     bool YoutubeSignatureDecryptor::js_code_to_operations(const std::string &function_body_str, const std::string &var_body_str, std::vector<DecryptFuncCall> &new_func_calls, std::map<std::string, DecryptFunction> &new_func_decls) {
         std::vector<std::string> function_body;
         string_split(function_body_str, ';', [&function_body](const char *str, size_t size) {
@@ -77,7 +98,7 @@ namespace QuickMedia {
             std::string func_name = func_decl_str.substr(0, func_name_split_index);
             func_name = strip(func_name);
             std::string function_body = func_decl_str.substr(func_start_index + 1);
-            function_body = strip(function_body);
+            function_body = strip(remove_whitespaces(function_body));
             if(!function_body.empty() && function_body.back() == '}')
                 function_body.pop_back();
 
@@ -86,8 +107,12 @@ namespace QuickMedia {
                 decrypt_function = DecryptFunction::REVERSE;
             else if(function_body == "a.splice(0,b)")
                 decrypt_function = DecryptFunction::SPLICE;
-            else
+            else if(function_body.find("a[0]=a[b%a.length]") != std::string::npos)
                 decrypt_function = DecryptFunction::SWAP;
+            else {
+                fprintf(stderr, "Unexpected decryption function body: |%s|\n", function_body.c_str());
+                return false;
+            }
             //fprintf(stderr, "declared function: %s, body: |%s|\n", func_name.c_str(), function_body.c_str());
             new_func_decls[std::move(func_name)] = decrypt_function;
         }
@@ -216,7 +241,7 @@ namespace QuickMedia {
                     break;
                 }
                 case DecryptFunction::SWAP: {
-                    if(sig.empty()) {
+                    if(sig.empty() || func_call.arg < 0) {
                         fprintf(stderr, "YoutubeSignatureDecryptor: sig unexpectedly empty in swap\n");
                     } else {
                         char c = sig[0];
@@ -229,7 +254,7 @@ namespace QuickMedia {
         }
 
         sig_key = sp;
-        sig_value = sig;
+        sig_value = url_param_encode(sig);
         return true;
     }
 
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