\n");
+ }
+ if (prefix_len > 0)
+ retval.append(String.format("%s" + BOX_TL + BOX_TOP + BOX_TOP + "[%4s%s]",
+ prefix, key_type, size_txt));
+ else
+ retval.append(String.format("" + BOX_TL + BOX_TOP + BOX_TOP + "[%4s%s]", key_type,
+ size_txt));
+
+ /* output upper border */
+ for (int i = 0; i < FLDSIZE_X - Math.max(key_type.length(), 4) - 9; i++)
+ retval.append(BOX_TOP);
+ retval.append(BOX_TR);
+ retval.append(NL);
+
+ if (prefix_len > 0) {
+ retval.append(prefix);
+ }
+
+ /* output content */
+ for (y = 0; y < FLDSIZE_Y; y++) {
+ retval.append(BOX_LEFT);
+ for (x = 0; x < FLDSIZE_X; x++) {
+ int idx = Math.min(field[x][y], len);
+ if (html && idx != 0)
+ retval.append("");
+ retval.append(augmentation_string.charAt(idx));
+ if (html && idx != 0)
+ retval.append("");
+ }
+ retval.append(BOX_RIGHT);
+ retval.append(NL);
+
+ if (prefix_len > 0) {
+ retval.append(prefix);
+ }
+ }
+
+ /* output lower border */
+ retval.append(BOX_BL);
+ for (int i = 0; i < FLDSIZE_X; i++)
+ retval.append(BOX_BOTTOM);
+ retval.append(BOX_BR);
+ retval.append(NL);
+ if (html)
+ retval.append("\n");
+
+ return retval.toString();
+ }
+
+ private static String getColor(long base, int mod) {
+ if (mod != 0) {
+ //base += mod * 16;
+ //base += mod * 16 * 256;
+ base += mod * 5 * 256 * 256;
+ }
+ if (base > 0xffffff || base < 0)
+ base &= 0xffffff;
+ return String.format("%06x", base);
+ }
+
+ public static void main(String[] args) {
+ try {
+ boolean uni = true;
+ boolean html = true;
+ if (html)
+ System.out.println("");
+ byte[] b = new byte[16];
+ net.i2p.util.RandomSource.getInstance().nextBytes(b);
+ String art = gnutls_key_fingerprint_randomart(b, "SHA", 128, null, uni, html);
+ System.out.println(art);
+ System.out.println("");
+ b = new byte[32];
+ for (int i = 0; i < 5; i++) {
+ net.i2p.util.RandomSource.getInstance().nextBytes(b);
+ art = gnutls_key_fingerprint_randomart(b, "XSHA", 256, null, uni, html);
+ System.out.println(art);
+ System.out.println("");
+ }
+ b = new byte[48];
+ net.i2p.util.RandomSource.getInstance().nextBytes(b);
+ art = gnutls_key_fingerprint_randomart(b, "XXSHA", 384, null, uni, html);
+ System.out.println(art);
+ System.out.println("");
+ b = new byte[64];
+ net.i2p.util.RandomSource.getInstance().nextBytes(b);
+ art = gnutls_key_fingerprint_randomart(b, "XXXSHA", 512, null, uni, html);
+ System.out.println(art);
+ if (html)
+ System.out.println("");
+ } catch (RuntimeException e) {
+ e.printStackTrace();
+ }
+ }
+}
diff --git a/apps/imagegen/imagegen/webapp/src/main/java/net/i2p/imagegen/RandomArtServlet.java b/apps/imagegen/imagegen/webapp/src/main/java/net/i2p/imagegen/RandomArtServlet.java
new file mode 100644
index 000000000..a11c2a3a0
--- /dev/null
+++ b/apps/imagegen/imagegen/webapp/src/main/java/net/i2p/imagegen/RandomArtServlet.java
@@ -0,0 +1,77 @@
+package net.i2p.imagegen;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import com.docuverse.identicon.IdenticonUtil;
+
+import net.i2p.data.Hash;
+import net.i2p.util.ConvertToHash;
+
+/**
+ * This servlet generates random art (visual identifier) images.
+ *
+ * @author modiied from identicon
+ * @since 0.9.25
+ */
+public class RandomArtServlet extends HttpServlet {
+
+ private static final long serialVersionUID = -3507466186902317988L;
+ private static final String PARAM_IDENTICON_CODE_SHORT = "c";
+ private static final long DEFAULT_IDENTICON_EXPIRES_IN_MILLIS = 24 * 60 * 60 * 1000;
+ private int version = 1;
+ private long identiconExpiresInMillis = DEFAULT_IDENTICON_EXPIRES_IN_MILLIS;
+
+ @Override
+ protected void doGet(HttpServletRequest request,
+ HttpServletResponse response) throws ServletException, IOException {
+
+ String codeParam = request.getParameter(PARAM_IDENTICON_CODE_SHORT);
+ boolean codeSpecified = codeParam != null && codeParam.length() > 0;
+ if (!codeSpecified)
+ codeParam="stats.i2p";
+ String identiconETag = IdenticonUtil.getIdenticonETag(codeParam.hashCode(), 0,
+ version);
+ String requestETag = request.getHeader("If-None-Match");
+
+ if (requestETag != null && requestETag.equals(identiconETag)) {
+ response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
+ } else {
+ Hash h = ConvertToHash.getHash(codeParam);
+ if (h == null) {
+ response.setStatus(403);
+ } else {
+ boolean html = true;
+ StringBuilder buf = new StringBuilder(512);
+ if (html) {
+ response.setContentType("text/html");
+ buf.append("");
+ } else {
+ response.setContentType("text/plain");
+ }
+ buf.append(RandomArt.gnutls_key_fingerprint_randomart(h.getData(), "SHA", 256, "", true, html));
+ if (html)
+ buf.append("");
+
+ // set ETag and, if code was provided, Expires header
+ response.setHeader("ETag", identiconETag);
+ if (codeSpecified) {
+ long expires = System.currentTimeMillis()
+ + identiconExpiresInMillis;
+ response.addDateHeader("Expires", expires);
+ }
+
+ // return image bytes to requester
+ byte[] imageBytes = buf.toString().getBytes("UTF-8");
+ response.setContentLength(imageBytes.length);
+ response.getOutputStream().write(imageBytes);
+ }
+ }
+ }
+}