#442 Fix email presence check being case-insensitive

- Add integration tests
- Change DataSource interface to return the number of accounts only, since that's all we require

src/main/java/fr/xephi/authme/datasource/CacheDataSource.java

@@ -160,8 +160,8 @@ public class CacheDataSource implements DataSource {
     }
 
     @Override
-    public synchronized List<String> getAllAuthsByEmail(final String email) {
-        return source.getAllAuthsByEmail(email);
+    public synchronized int countAuthsByEmail(final String email) {
+        return source.countAuthsByEmail(email);
     }
 
     @Override

src/main/java/fr/xephi/authme/datasource/DataSource.java

@@ -101,12 +101,12 @@ public interface DataSource {
     List<String> getAllAuthsByIp(String ip);
 
     /**
-     * Return all usernames associated with the given email address.
+     * Return the number of accounts associated with the given email address.
      *
      * @param email The email address to look up
-     * @return Users using the given email address
+     * @return Number of accounts using the given email address
      */
-    List<String> getAllAuthsByEmail(String email);
+    int countAuthsByEmail(String email);
 
     /**
      * Update the email of the PlayerAuth in the data source.

src/main/java/fr/xephi/authme/datasource/FlatFile.java

@@ -487,25 +487,21 @@ public class FlatFile implements DataSource {
     }
 
     @Override
-    public List<String> getAllAuthsByEmail(String email) {
+    public int countAuthsByEmail(String email) {
         BufferedReader br = null;
-        List<String> countEmail = new ArrayList<>();
+        int countEmail = 0;
         try {
             br = new BufferedReader(new FileReader(source));
             String line;
             while ((line = br.readLine()) != null) {
                 String[] args = line.split(":");
                 if (args.length > 8 && args[8].equals(email)) {
-                    countEmail.add(args[0]);
+                    ++countEmail;
                 }
             }
             return countEmail;
-        } catch (FileNotFoundException ex) {
-            ConsoleLogger.showError(ex.getMessage());
-            return new ArrayList<>();
         } catch (IOException ex) {
             ConsoleLogger.showError(ex.getMessage());
-            return new ArrayList<>();
         } finally {
             if (br != null) {
                 try {
@@ -514,6 +510,7 @@ public class FlatFile implements DataSource {
                 }
             }
         }
+        return 0;
     }
 
     @Override

src/main/java/fr/xephi/authme/datasource/MySQL.java

@@ -706,20 +706,19 @@ public class MySQL implements DataSource {
     }
 
     @Override
-    public synchronized List<String> getAllAuthsByEmail(String email) {
-        List<String> emails = new ArrayList<>();
-        String sql = "SELECT " + col.NAME + " FROM " + tableName + " WHERE " + col.EMAIL + "=?;";
+    public synchronized int countAuthsByEmail(String email) {
+        String sql = "SELECT COUNT(1) FROM " + tableName + " WHERE UPPER(" + col.EMAIL + ") = UPPER(?)";
         try (Connection con = getConnection(); PreparedStatement pst = con.prepareStatement(sql)) {
             pst.setString(1, email);
             try (ResultSet rs = pst.executeQuery()) {
-                while (rs.next()) {
-                    emails.add(rs.getString(col.NAME));
+                if (rs.next()) {
+                    return rs.getInt(1);
                 }
             }
         } catch (SQLException ex) {
             logSqlException(ex);
         }
-        return emails;
+        return 0;
     }
 
     @Override
@@ -907,12 +906,12 @@ public class MySQL implements DataSource {
 
     @Override
     public synchronized boolean isEmailStored(String email) {
-        String sql = "SELECT 1 FROM " + tableName + " WHERE " + col.EMAIL + " = ?";
-        try (Connection con = ds.getConnection()) {
-            PreparedStatement pst = con.prepareStatement(sql);
+        String sql = "SELECT 1 FROM " + tableName + " WHERE UPPER(" + col.EMAIL + ") = UPPER(?)";
+        try (Connection con = ds.getConnection(); PreparedStatement pst = con.prepareStatement(sql)) {
             pst.setString(1, email);
-            ResultSet rs = pst.executeQuery();
-            return rs.next();
+            try (ResultSet rs = pst.executeQuery()) {
+                return rs.next();
+            }
         } catch (SQLException e) {
             logSqlException(e);
         }

src/main/java/fr/xephi/authme/datasource/SQLite.java

@@ -410,25 +410,19 @@ public class SQLite implements DataSource {
     }
 
     @Override
-    public List<String> getAllAuthsByEmail(String email) {
-        PreparedStatement pst = null;
-        ResultSet rs = null;
-        List<String> countEmail = new ArrayList<>();
-        try {
-            pst = con.prepareStatement("SELECT * FROM " + tableName + " WHERE " + col.EMAIL + "=?;");
+    public int countAuthsByEmail(String email) {
+        String sql = "SELECT COUNT(1) FROM " + tableName + " WHERE " + col.EMAIL + " = ? COLLATE NOCASE;";
+        try (PreparedStatement pst = con.prepareStatement(sql)) {
             pst.setString(1, email);
-            rs = pst.executeQuery();
-            while (rs.next()) {
-                countEmail.add(rs.getString(col.NAME));
+            try (ResultSet rs = pst.executeQuery()) {
+                if (rs.next()) {
+                    return rs.getInt(1);
+                }
             }
-            return countEmail;
         } catch (SQLException ex) {
             logSqlException(ex);
-        }  finally {
-            close(rs);
-            close(pst);
         }
-        return new ArrayList<>();
+        return 0;
     }
 
     @Override

src/main/java/fr/xephi/authme/process/register/AsyncRegister.java

@@ -98,7 +98,7 @@ public class AsyncRegister {
     private void emailRegister() {
         if (Settings.getmaxRegPerEmail > 0
             && !plugin.getPermissionsManager().hasPermission(player, PlayerStatePermission.ALLOW_MULTIPLE_ACCOUNTS)
-            && database.getAllAuthsByEmail(email).size() >= Settings.getmaxRegPerEmail) {
+            && database.countAuthsByEmail(email) >= Settings.getmaxRegPerEmail) {
             m.send(player, MessageKey.MAX_REGISTER_EXCEEDED);
             return;
         }

src/test/java/fr/xephi/authme/datasource/SQLiteIntegrationTest.java

@@ -138,6 +138,39 @@ public class SQLiteIntegrationTest {
         assertThat(userAuth.getPassword(), equalToHash("b28c32f624a4eb161d6adc9acb5bfc5b", "f750ba32"));
     }
 
+    @Test
+    public void shouldFindIfEmailExists() {
+        // given
+        DataSource dataSource = new SQLite(settings, con, false);
+
+        // when
+        boolean isUserMailPresent = dataSource.isEmailStored("user@example.org");
+        boolean isUserMailPresentCaseInsensitive = dataSource.isEmailStored("user@example.ORG");
+        boolean isInvalidMailPresent = dataSource.isEmailStored("not-in-database@example.com");
+
+        // then
+        assertThat(isUserMailPresent, equalTo(true));
+        assertThat(isUserMailPresentCaseInsensitive, equalTo(true));
+        assertThat(isInvalidMailPresent, equalTo(false));
+    }
+
+    @Test
+    public void shouldCountAuthsByEmail() {
+        // given
+        DataSource dataSource = new SQLite(settings, con, false);
+
+        // when
+        int userMailCount = dataSource.countAuthsByEmail("user@example.ORG");
+        int invalidMailCount = dataSource.countAuthsByEmail("not.in.db@example.com");
+        dataSource.saveAuth(PlayerAuth.builder().name("Test").email("user@EXAMPLE.org").build());
+        int newUserCount = dataSource.countAuthsByEmail("user@Example.org");
+
+        // then
+        assertThat(userMailCount, equalTo(1));
+        assertThat(invalidMailCount, equalTo(0));
+        assertThat(newUserCount, equalTo(2));
+    }
+
     private static <T> void set(Property<T> property, T value) {
         when(settings.getProperty(property)).thenReturn(value);
     }