Add support for username rewrite (Fix #103)

src/main/java/io/kamax/mxisd/config/AuthenticationConfig.java

@@ -0,0 +1,110 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sarl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+import javax.annotation.PostConstruct;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+@Configuration
+@ConfigurationProperties(prefix = "auth")
+public class AuthenticationConfig {
+
+    public static class Rule {
+
+        private String regex;
+        private transient Pattern pattern;
+        private String medium;
+
+        public String getRegex() {
+            return regex;
+        }
+
+        public void setRegex(String regex) {
+            this.regex = regex;
+        }
+
+        public Pattern getPattern() {
+            return pattern;
+        }
+
+        public void setPattern(Pattern pattern) {
+            this.pattern = pattern;
+        }
+
+        public String getMedium() {
+            return medium;
+        }
+
+        public void setMedium(String medium) {
+            this.medium = medium;
+        }
+
+    }
+
+    public static class User {
+
+        private List<Rule> rules = new ArrayList<>();
+
+        public List<Rule> getRules() {
+            return rules;
+        }
+
+        public void setRules(List<Rule> mappings) {
+            this.rules = mappings;
+        }
+
+    }
+
+    public static class Rewrite {
+
+        private User user = new User();
+
+        public User getUser() {
+            return user;
+        }
+
+        public void setUser(User user) {
+            this.user = user;
+        }
+
+    }
+
+    private Rewrite rewrite = new Rewrite();
+
+    public Rewrite getRewrite() {
+        return rewrite;
+    }
+
+    public void setRewrite(Rewrite rewrite) {
+        this.rewrite = rewrite;
+    }
+
+    @PostConstruct
+    public void build() {
+        getRewrite().getUser().getRules().forEach(mapping -> mapping.setPattern(Pattern.compile(mapping.getRegex())));
+    }
+
+}