Closes #42: Gravatar images in comments

docs-core/src/main/java/com/sismics/docs/core/dao/jpa/CommentDao.java

@@ -90,7 +90,7 @@ public class CommentDao {
      */
     public List<CommentDto> getByDocumentId(String documentId) {
         EntityManager em = ThreadLocalContext.get().getEntityManager();
-        StringBuilder sb = new StringBuilder("select c.COM_ID_C, c.COM_CONTENT_C, c.COM_CREATEDATE_D, u.USE_USERNAME_C from T_COMMENT c, T_USER u");
+        StringBuilder sb = new StringBuilder("select c.COM_ID_C, c.COM_CONTENT_C, c.COM_CREATEDATE_D, u.USE_USERNAME_C, u.USE_EMAIL_C from T_COMMENT c, T_USER u");
         sb.append(" where c.COM_IDDOC_C = :documentId and c.COM_IDUSER_C = u.USE_ID_C and c.COM_DELETEDATE_D is null ");
         sb.append(" order by c.COM_CREATEDATE_D asc ");
         Query q = em.createNativeQuery(sb.toString());
@@ -106,6 +106,7 @@ public class CommentDao {
             commentDto.setContent((String) o[i++]);
             commentDto.setCreateTimestamp(((Timestamp) o[i++]).getTime());
             commentDto.setCreatorName((String) o[i++]);
+            commentDto.setCreatorEmail((String) o[i++]);
             commentDtoList.add(commentDto);
         }
         return commentDtoList;

docs-core/src/main/java/com/sismics/docs/core/dao/jpa/dto/CommentDto.java

@@ -19,6 +19,11 @@ public class CommentDto {
      */
     private String creatorName;
     
+    /**
+     * Creator email.
+     */
+    private String creatorEmail;
+    
     /**
      * Content.
      */
@@ -44,6 +49,14 @@ public class CommentDto {
     public void setCreatorName(String creatorName) {
         this.creatorName = creatorName;
     }
+    
+    public String getCreatorEmail() {
+        return creatorEmail;
+    }
+
+    public void setCreatorEmail(String creatorEmail) {
+        this.creatorEmail = creatorEmail;
+    }
 
     public String getContent() {
         return content;

docs-core/src/main/java/com/sismics/util/ImageUtil.java

@@ -11,6 +11,8 @@ import javax.imageio.ImageWriteParam;
 import javax.imageio.ImageWriter;
 import javax.imageio.stream.ImageOutputStream;
 
+import com.google.common.base.Charsets;
+import com.google.common.hash.Hashing;
 import com.sismics.util.mime.MimeType;
 
 /**
@@ -62,4 +64,21 @@ public class ImageUtil {
     public static boolean isImage(String mimeType) {
         return mimeType.equals(MimeType.IMAGE_GIF) || mimeType.equals(MimeType.IMAGE_PNG) || mimeType.equals(MimeType.IMAGE_JPEG);
     }
+    
+    /**
+     * Compute Gravatar hash.
+     * See https://en.gravatar.com/site/implement/hash/.
+     * 
+     * @param email
+     * @return Gravatar hash
+     */
+    public static String computeGravatar(String email) {
+        if (email == null) {
+            return null;
+        }
+        
+        return Hashing.md5().hashString(
+                email.trim().toLowerCase(), Charsets.UTF_8)
+                .toString();
+    }
 }

docs-core/src/test/java/com/sismics/util/TestImageUtil.java

@@ -0,0 +1,17 @@
+package com.sismics.util;
+
+import junit.framework.Assert;
+import org.junit.Test;
+
+/**
+ * Test of the image utilities.
+ * 
+ * @author bgamard
+ */
+public class TestImageUtil {
+
+    @Test
+    public void computeGravatarTest() throws Exception {
+        Assert.assertEquals("0bc83cb571cd1c50ba6f3e8a78ef1346", ImageUtil.computeGravatar("MyEmailAddress@example.com "));
+    }
+}