Fixed missing Access-Control-Allow-Origin header.

src/main/java/fr/unistra/sil/erp/back/filter/CORSFilter.java

+/*
+ * CONTRAT DE LICENCE DE LOGICIEL LIBRE CECILL-B
+ * https://cecill.info/licences/Licence_CeCILL-B_V1-fr.html
+ */
+package fr.unistra.sil.erp.back.filter;
+
+import java.io.IOException;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+/**
+ * Because Spring sucks.
+ * 
+ * @author BEAUVAIS ANTOINE
+ */
+@Component
+public class CORSFilter extends OncePerRequestFilter {
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest hsr, HttpServletResponse hsr1, FilterChain fc) throws ServletException, IOException {
+        hsr1.addHeader("Access-Control-Allow-Origin", "*");
+        fc.doFilter(hsr, hsr1);
+    }
+    
+}