add_stored() for config_passphrase_for_new_keys()

passphrase_cache.cc

@@ -46,6 +46,12 @@ namespace pEp {
         return "";
     }
 
+    const char *PassphraseCache::add_stored(const std::string& passphrase)
+    {
+        _stored = passphrase;
+        return _stored.c_str();
+    }
+
     bool PassphraseCache::for_each_passphrase(const passphrase_callee& callee)
     {
         std::lock_guard<std::mutex> lock(_mtx);
@@ -54,6 +60,9 @@ namespace pEp {
         if (callee(""))
             return true;
 
+        if (callee(_stored))
+            return true;
+
         for (auto entry=_cache.begin(); entry!=_cache.end(); ++entry) {
             if (callee(entry->passphrase)) {
                 refresh(entry);

passphrase_cache.hh

@@ -23,7 +23,8 @@ namespace pEp {
         };
         using cache = std::list<cache_entry>;
 
-        cache _cache;   
+        cache _cache;
+        std::string _stored;
         std::mutex _mtx;
         size_t _max_size;
         duration _timeout;
@@ -47,6 +48,9 @@ namespace pEp {
         // returns a ptr to the passsword entry in the cache. Don't free() it!
         const char *add(const std::string& passphrase);
 
+        // adds the stored passphrase to the cache, which will not timeout
+        const char *add_stored(const std::string& passphrase);
+
         // get all passphrases in cache from latest to oldest one by each call
         // this function is throwing PassphraseCache::Empty when cache is empty
         // and PassphraseCache::Exhausted when no passphrases are left, then