added QR code and preview of base64 QR

main.py

@@ -379,6 +379,17 @@ def api():
                 'INSERT INTO WEB_URL (LONG_URL, SHORT_URL, USERNAME) VALUES (?, ?, ?)',
                 [longURL, short, username]
             )
+
+            try:
+                request.form['qr']
+                qr64 = "data:image/jpeg;base64," + makeQR(url_scheme + "://" + short)
+                
+                return jsonify(
+                    status="0",
+                    message="ok",
+                    qr=qr64
+                )
+            except:
                 return jsonify(
                     status="0",
                     message="ok"

templates/apiDocs.html

@@ -23,15 +23,17 @@
     <ul>
         <li>short: the short URL you want to get. example: {{domain}}/example</li>
         <li>long: the long URL you want to short</li>
+        <li>qr: if you add this parameter you will get an base64 encoded QR code image</li>
         <li>apikey: you can add this argument, if you want to assign this link to your account.</li>
     </ul>
-    <p>example API call with curl: <i>curl -d "apikey={{apikey}}&short={{domain}}/example&long=http://example.com" -X POST {{url_scheme}}://{{domain}}/user/api</i></p>
+    <p>example API call with curl: <i>curl -d "apikey={{apikey}}&short={{domain}}/example&long=http://example.com" -X POST {{url_scheme}}://{{domain}}/user/api</i>
 
     <h3>Responses from Server</h3>
     <p>The response from the server is always made in json format it includes the following arguments:</p>
     <ul>
         <li>status: The status code of the reponse. Down there is a table with the posible response codes</li>
         <li>message: This argument will do the same like the status code, but it is written out, for reading by human.</li>
+        <li>qr: If you enabled the QR code this will include a QR code of the shorten link as base64 coded jpeg image</li>
     </ul>
 
     <h4>Response codes:</h4>
@@ -62,4 +64,15 @@
         </tr>
 
     </table>
+
+    <h2>Preview image</h2>
+    <p>Please paste your base64 image here: <input type="text" id="base64Input"> <button onclick="showBase64Image();">show</button></p>
+    <p style="font-size: 13px;">(this will not work very well in google Chrome)</p>
+    <img id="base64Image">
+
+    <script>
+        function showBase64Image(){
+            document.getElementById("base64Image").src = document.getElementById("base64Input").value;
+        }
+    </script>
 </body>
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