incorporate https://github.com/ivoviz/feedback

allows user to mark an image and send it.
sends an email to configured recipient. defaults to using localhost:25
as the SMTP server (no user name, no password, see [1] for configuration
parameters of flask-mail).

Introduces a config parameter:
FEEDBACK_RECIPIENT = feedback@localhost

left TODO:
1. customize the 'thank you' text
2. document in user guide (setting MAIL_DEFAULT_SENDER correctly)

[1] https://pythonhosted.org/Flask-Mail/#configuring-flask-mail

3 files changed, 59 insertions, 2 deletions

diff --git a/src/server/rz_feedback.py b/src/server/rz_feedback.py
index 74fe2c7f..677814db 100644
--- a/src/server/rz_feedback.py
+++ b/src/server/rz_feedback.py
@@ -1,11 +1,20 @@
 import logging
+import base64
 
 from flask import request
 from flask import json
+from flask import current_app
+from flask import session
 
+from rz_mail import send_message
 
 log = logging.getLogger('rhizi')
 
+def decode_base64_uri(base64_encoded_data_uri):
+    start = base64_encoded_data_uri.find(',') + 1
+    encoded = base64_encoded_data_uri[start:]
+    return base64.decodestring(encoded)
+
 def feedback():
     """
     Email all parts as attachments to configured feedback email
@@ -17,7 +26,7 @@ def feedback():
         req_json = json.loads(feedback)
         url = req_json['url']
         note = req_json['note']
-        img = req_json['img'] # FIXME base64 encoded data URI
+        img = decode_base64_uri(req_json['img'])
         html = req_json['html']
         return url, note, img, html
 
@@ -26,4 +35,23 @@ def feedback():
     except:
         log.warn('failed to sanitize inputs. request: %s' % request)
 
-    return "success"
+    # FIXME: should be async via celery (or another method)
+    session_user = session.get('username')
+    feedback_body = """Feedback from user:
+%(user)s
+
+watching URL:
+%(url)s
+
+Left note:
+%(note)s
+""" % dict(url=url, note=note, user=session_user if session_user else "Not logged in")
+    send_message(recipients=[current_app.rz_config.FEEDBACK_RECIPIENT],
+                 subject="User feedback from Rhizi",
+                 body=feedback_body,
+                 attachments=[
+                    ('feedback_screenshot.png', img),
+                    ('feedback_page.html', html),
+                 ])
+
+    return "{}" # expects json encoded, contents discarded
diff --git a/src/server/rz_mail.py b/src/server/rz_mail.py
new file mode 100644
index 00000000..0ecf1d61
--- /dev/null
+++ b/src/server/rz_mail.py
@@ -0,0 +1,27 @@
+import magic
+
+from flask_mail import Mail, Message
+
+mail = None
+
+magic_mime = magic.open(magic.MAGIC_MIME)
+magic_mime.load()
+
+def mimetype(data):
+    return magic_mime.buffer(data).split(';')[0]
+
+def init_mail(webapp):
+    global mail
+    mail = Mail(webapp)
+
+def send_message(recipients, subject, attachments, body):
+    """
+    attachments is a list of tuples (filename, data)
+    libmagic is used to guess the mimetype
+    """
+    msg = Message(subject, recipients=recipients)
+    msg.body = body
+    for filename, data in attachments:
+        msg.attach(filename=filename, content_type=mimetype(data), data=data)
+    mail.send(msg)
+
diff --git a/src/server/rz_server.py b/src/server/rz_server.py
index 52db213e..87ba09a4 100644
--- a/src/server/rz_server.py
+++ b/src/server/rz_server.py
@@ -27,6 +27,7 @@ from flask import send_from_directory
 
 from rz_mesh import init_ws_interface
 from rz_kernel import RZ_Kernel
+from rz_mail import init_mail
 import rz_api
 import rz_api_rest
 import rz_feedback
@@ -270,5 +271,6 @@ if __name__ == "__main__":
     kernel = RZ_Kernel()
     webapp = init_webapp(cfg, kernel)
     ws_srv = init_ws_interface(cfg, kernel, webapp)
+    init_mail(webapp)
 
     ws_srv.serve_forever()