Cookie based login added

    - the cookie last 1 year and is set upon login
    - deleted when pressing "Disconnect" button
    - updated the config.mk and Makefile for COOKIES_DIR variable
    - camel-cased the subroutines. I like it that way, it stands out more
    compared to variables
    - reinserted some vars back into link-tmpl.cgi, it wasn't making sense
    to have them in gpigeon-template.cgi
    - no more 'Unknown' link asker in the links table: if the string is a valid
    email address, we link to the file in the table.

1 files changed, 31 insertions, 22 deletions

diff --git a/README.md b/README.md
index 485cf42..873b3d9 100644
--- a/README.md
+++ b/README.md
@@ -1,49 +1,58 @@
 GPIGEON
 ========
 
-Gpigeon generate links for a GPG user to be sent to a non technical person (or
-not a GPG user) so they can send you encrypted mail messages via a one-time
-web link.
+Gpigeon generate links for a non technical person or someone not familiar
+with GPG, so they can send you encrypted mails via a one-time
+web form.
 Feels of déjàvu ? I was inspired by https://hawkpost.co but wasn't really
 interested in the multi-user perspective and managing a database.
 
-Features
+Overview
 ========
 
-    * Single user: no database required.
+    * Single user.
     * One-time GPG form: after sending the encrypted message, the generated form
     self-destructs.
-    * A table of the links generated is visible when you connect so you can
-    keep track. You can also delete link individually or all at once.
+    * Cookie based login. If you block cookies, it will switch back to
+    hidden fields so you can still login, manage and create links.
+    * A table of the links generated is visible after connecting so you can
+    keep track of what has been created. You can also delete links
+    individually, or all at once.
+    * No javascript used for the moment.
 
 Dependencies
 ============
 
-You need perl and the following modules and my perl version is v5.32.0, YMMV:
+You will need perl and the following modules and my perl version is v5.32.0, YMMV:
 
-    * Net:SSLeay
-    * Digest::SHA 
-    * Email::Valid 
-    * String::Random 
     * HTML::Entities
-    * CGI (I'm planning on removing it, I use it just for the
-    convenient param function.) 
-    * CGI::Carp (primarly for debugging, comment the line in
-    gpigeon-template.cgi if you won't need it)
+    * CGI
+    * CGI::Carp
+    * CGI::Cookies
+    * Crypt::Argon2
+    * GPG
+    * Net:SSLeay
     * Net::SMTP
     * Net::SMTPS
-    * GPG
+    * Email::Valid 
+    * String::Random 
 
 Having a webserver with CGI support or a separate CGI engine is needed. I'm using
 nginx and fcgiwrap.
 A note on Net::SMTP and Net:SMTPS dependencies: if you have a mailserver well
-configured with OpenDKIM and the likes (so your chances to get your mail
-treated as spam is greatly reduced) you could replace these two deps with
-Mail::Sendmail then comment and uncomment some lines in <gpigeon-template.cgi>.
+configured with SPF and OpenDKIM (so your chances to get your mail
+treated as spam is greatly reduced) you should set the `HAS_MAILSERVER`
+variable to 1 in the config.mk file.
 
 
 Installation
 ============
 
-Look in the [gpigeon-template.cgi](https://git.les-miquelots.net/gpigeon/plain/gpigeon-template.cgi) source code you should figure things out quickly.
-Hint: look for variables values ending in 'goes_here'.
+Edit the config.mk file to customize the installation to your needs, and then
+execute:
+`sudo make`
+
+You should also look in the
+[gpigeon-template.cgi](https://git.les-miquelots.net/gpigeon/plain/gpigeon-template.cgi)
+and [link-tmpl.cgi](https://git.les-miquelots.net/gpigeon/plain/link-tmpl.cgi) source code, you should figure things out quickly.
+**Hint**: look for variables values ending in _goes_here_.