Issue 3180 - Work around outlook URL rewrites

modules/web/templates/adblockplus.org.conf.erb

 # XSS and clickjacking prevention headers
 
 set $csp_frame "";
 if ($uri ~ ^/(:?\w\w(_\w\w)?/)?(?:index|firefox|chrome|opera|android|internet-explorer|safari|yandex-browser|maxthon)?$)
 {
   set $csp_frame "; frame-src www.youtube-nocookie.com;";
 }
 add_header Content-Security-Policy "default-src 'self'; img-src * data:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval' $csp_frame";
 add_header X-Frame-Options "sameorigin";
 
@@ skipping 232 matching lines @@
 location ~ ^(/blog|/releases|/development-builds|/atom|/rss|/category|/section|/author|/file_download|/images|/textpattern|/default-static|/_override-static)($|/)
 {
   try_files $uri @proxied;
 }
 location /submitEmail
 {
   try_files $uri @proxied;
 }
 location /verifyEmail
 {
+  # Workaround for MS Outlook's behavior of re-encoding URLs;
+  # see https://issues.adblockplus.org/ticket/3180 for more information
+  if ($arg_email ~ (.*)%2540(.*)) {
+    set $email_user $1;
+    set $email_domain $2;
+    rewrite ^(.*)$ $1?email=$email_user%40$email_domain&signature=$arg_signature&product=$arg_product&lang=$arg_lang? redirect;
+  }
+
   try_files $uri @proxied;
 }
 location /forum
 {
   try_files $uri @proxied;
 }
 location /subscriptions.xml
 {
   try_files $uri @proxied;
 }
@@ skipping 16 matching lines @@
 location /403.html
 {
   try_files $uri @proxied;
 }
 location @proxied
 {
   proxy_pass https://server16.adblockplus.org;
   proxy_set_header Host adblockplus.org;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 }