Check mute/deafen permissions using the channel

Prevents false missing permission exceptions
at the cost of missing exceptions
if the member or the voice state is absent

src/main/java/net/dv8tion/jda/api/entities/Guild.java

@@ -3985,7 +3985,8 @@ default AuditableRestAction<Void> timeoutFor(@Nonnull UserSnowflake user, @Nonnu
      *         Whether this {@link net.dv8tion.jda.api.entities.Member Member} should be deafened or undeafened.
      *
      * @throws net.dv8tion.jda.api.exceptions.InsufficientPermissionException
-     *         If the logged in account does not have the {@link net.dv8tion.jda.api.Permission#VOICE_DEAF_OTHERS} permission.
+     *         If the logged in account does not have the {@link net.dv8tion.jda.api.Permission#VOICE_DEAF_OTHERS} permission
+     *         in the given channel.
      * @throws IllegalArgumentException
      *         If the provided user is null.
      * @throws java.lang.IllegalStateException
@@ -4024,7 +4025,8 @@ default AuditableRestAction<Void> timeoutFor(@Nonnull UserSnowflake user, @Nonnu
      *         Whether this {@link net.dv8tion.jda.api.entities.Member Member} should be muted or unmuted.
      *
      * @throws net.dv8tion.jda.api.exceptions.InsufficientPermissionException
-     *         If the logged in account does not have the {@link net.dv8tion.jda.api.Permission#VOICE_DEAF_OTHERS} permission.
+     *         If the logged in account does not have the {@link net.dv8tion.jda.api.Permission#VOICE_DEAF_OTHERS} permission
+     *         in the given channel.
      * @throws java.lang.IllegalArgumentException
      *         If the provided user is null.
      * @throws java.lang.IllegalStateException

src/main/java/net/dv8tion/jda/internal/entities/GuildImpl.java

@@ -32,6 +32,7 @@
 import net.dv8tion.jda.api.entities.channel.concrete.*;
 import net.dv8tion.jda.api.entities.channel.middleman.AudioChannel;
 import net.dv8tion.jda.api.entities.channel.middleman.GuildChannel;
+import net.dv8tion.jda.api.entities.channel.unions.AudioChannelUnion;
 import net.dv8tion.jda.api.entities.channel.unions.DefaultGuildChannelUnion;
 import net.dv8tion.jda.api.entities.emoji.CustomEmoji;
 import net.dv8tion.jda.api.entities.emoji.RichCustomEmoji;
@@ -64,6 +65,7 @@
 import net.dv8tion.jda.api.utils.data.DataObject;
 import net.dv8tion.jda.internal.JDAImpl;
 import net.dv8tion.jda.internal.entities.automod.AutoModRuleImpl;
+import net.dv8tion.jda.internal.entities.channel.mixin.middleman.GuildChannelMixin;
 import net.dv8tion.jda.internal.handle.EventCache;
 import net.dv8tion.jda.internal.interactions.CommandDataImpl;
 import net.dv8tion.jda.internal.interactions.command.CommandImpl;
@@ -1641,18 +1643,19 @@ private AuditableRestAction<Void> timeoutUntilById0(@Nonnull String userId, @Nul
     public AuditableRestAction<Void> deafen(@Nonnull UserSnowflake user, boolean deafen)
     {
         Checks.notNull(user, "User");
-        checkPermission(Permission.VOICE_DEAF_OTHERS);
 
         Member member = resolveMember(user);
         if (member != null)
         {
             GuildVoiceState voiceState = member.getVoiceState();
             if (voiceState != null)
             {
-                if (voiceState.getChannel() == null)
+                final AudioChannelUnion channel = voiceState.getChannel();
+                if (channel == null)
                     throw new IllegalStateException("Can only deafen members who are currently in a voice channel");
                 if (voiceState.isGuildDeafened() == deafen)
                     return new CompletedRestAction<>(getJDA(), null);
+                ((GuildChannelMixin<?>) channel).checkPermission(Permission.VOICE_DEAF_OTHERS);
             }
         }
 
@@ -1666,18 +1669,19 @@ public AuditableRestAction<Void> deafen(@Nonnull UserSnowflake user, boolean dea
     public AuditableRestAction<Void> mute(@Nonnull UserSnowflake user, boolean mute)
     {
         Checks.notNull(user, "User");
-        checkPermission(Permission.VOICE_MUTE_OTHERS);
 
         Member member = resolveMember(user);
         if (member != null)
         {
             GuildVoiceState voiceState = member.getVoiceState();
             if (voiceState != null)
             {
-                if (voiceState.getChannel() == null)
+                final AudioChannelUnion channel = voiceState.getChannel();
+                if (channel == null)
                     throw new IllegalStateException("Can only mute members who are currently in a voice channel");
                 if (voiceState.isGuildMuted() == mute && (mute || !voiceState.isSuppressed()))
                     return new CompletedRestAction<>(getJDA(), null);
+                ((GuildChannelMixin<?>) channel).checkPermission(Permission.VOICE_MUTE_OTHERS);
             }
         }