This is a simple example of using Persona in Ur/Web. It is based on the Persona Quick Setup [1] and portions of the Ur/Web OpenId library [2].

I created this to get a minimal working example of using Persona from Ur/Web and a 'real' application would want to add more session and user management.

[1] https://developer.mozilla.org/en-US/Persona/Quick_Setup [2] http://hg.impredicative.com/openid

Usage

Run 'make' to build. It requires a recent Ur/Web [3] version, libjansson [4] and libcurl [5]. The Makefile creates a binary that uses SQLite [6] for the session database. The steps to build, create the database and run are:

$make$ sqlite3 persona <persona.sql $ ./persona.exe

The example requires a file 'urweb_persona.js' to be served by an external web server. I use 'nginx' and set it up to reverse proxy to the 'persona' example. The 'nginx' config looks like:

server { listen 80; server_name 127.0.0.1;

location /urweb_persona.js { root /home/chris/src/ur/persona/; }

location / { proxy_pass http://127.0.0.1:8080/; } }

Accessing 'http://127.0.0.1/main' will run the example.

[3] http://www.impredicative.com/ur/ [4] http://www.digip.org/jansson/ [5] http://curl.haxx.se/libcurl/ [6] http://www.sqlite.org/

Code Overview

Ur/Web doesn't contain any API for doing HTTP requests and Persona needs to contact a validation server to validate authentication. To work around this I use the FFI to wrap libcurl to make the request and libjansson to parse the JSON response. The FFI code for this is in:

ffi.c ffi.h ffi.urs

The Ur/Web FFI allows wrapping and calling JavaScript functions from within client code written in Ur/Web. The JS code for this lives in:

urweb_persona.js

This needs to be served by an external web server as Ur/Web doesn't provide out of the box functionality to serve files. The Ur definitions for these JS functions are in:

personaFfi.urs

The core of the application is in:

persona.ur persona.urs

With the glue that ties the project together in:

persona.urp