steam auth 3

src/main/java/app/controllers/auth/AuthSteamController.java

@@ -4,6 +4,7 @@ import app.annotations.enums.AuthMethod;
 import app.annotations.exceptions.InvalidCookie;
 import app.annotations.exceptions.NeedCookie;
 import app.annotations.interfaces.CheckWebAccess;
+import app.entities.other.SteamID;
 import app.services.db.DiscordAuthService;
 import app.services.steam.SteamSignIn;
 import app.services.steam.SteamWebApi;
@@ -108,4 +109,23 @@ public class AuthSteamController {
         if (discord_id != null) return new ResponseEntity(discord_id, HttpStatus.OK);
         else return new ResponseEntity<>(HttpStatus.NOT_FOUND);
     }
+
+    @DeleteMapping("steam/discord")
+    public ResponseEntity unregisterDiscordUser(@CookieValue(value = "steam64", defaultValue = "") String steam64,
+                                                @CookieValue(value = "steam64_secured", defaultValue = "") String steam64_secured){
+        if (steam64.isEmpty() || steam64_secured.isEmpty()) {
+            throw new NeedCookie();
+        }
+
+        if (!saltedCookie.Validate(steam64, steam64_secured)) {
+            throw new InvalidCookie();
+        }
+        SteamID steamID = SteamIDConverter.getSteamID(steam64);
+
+        String discord_id = discordAuthService.getDiscordIDofSteamID(steamID);
+        if (discord_id == null) return new ResponseEntity(HttpStatus.NOT_FOUND);
+
+        boolean result = discordAuthService.removeSteamIDofDiscordID(steamID);
+        return new ResponseEntity(result, HttpStatus.OK);
+    }
 }