#lua-resty-vhost

Library for matching hostnames to values. Supports wildcard and .hostname.tld syntax in the same way as Nginx's server_name directive.

Keys beginning with . or *. will match apex and all sub-domains, longest match wins. Non-wildcard matches always win.

Regex matches and prefix wildcards are not supported.

#Overview

    lua_package_path "/path/to/lua-resty-vhost/lib/?.lua;;";
    
    init_by_lua_block {
        local vhost = require("resty.vhost")
        my_vhost = vhost:new()
        local ok, err = my_vhost:insert("example.com",      { key = "example.com.key",          cert = "example.com.crt" })
        local ok, err = my_vhost:insert("www.example.com",  { key = "example.com.key",          cert = "example.com.crt" })
        local ok, err = my_vhost:insert(".sub.example.com", { key = "star.sub.example.com.key", cert = "star.sub.example.com.crt" })
        local ok, err = my_vhost:insert("www.example2.com", { key = "www.example2.com.key",     cert = "www.example2.com.crt" })
    }
    
    server {
        listen 80 default_server;
        listen 443 ssl default_server;
        server_name vhost;
    
        ssl_certificate         /path/to/default/cert.crt;
        ssl_certificate_key     /path/to/default/key.crt;
    
        ssl_certificate_by_lua_block {
            local val, err = my_vhost:lookup(require("ngx.ssl").server_name())
            if not val then
                ngx.log(ngx.ERR, err)
            else
                ngx.log(ngx.DEBUG, "Match, setting certs: ", val.cert, " ", val.key)
                -- set_certs_somehow(val)
            end
        }
    
        location / {
            content_by_lua_block {
                local val, err = my_vhost:lookup(ngx.var.host)
                if val then
                    -- do something based on val
                    ngx.say("Matched: ", val.cert)
                else
                    if err then
                        ngx.log(ngx.ERR, err)
                    end
                    ngx.exit(404)
                end
            }
        }
    }

Methods

new

syntax: my_vhost, err = vhost:new(size?)

Creates a new instance of resty-vhost with an optional initial size

insert

syntax: ok, err = my_vhost:insert(key, value)

Adds a new hostname key with associated value.

Keys must be strings.

Returns false and an error message on failure.

lookup

syntax: val, err = my_vhost:lookup(hostname)

Retrieves value for best matching hostname entry.

Returns nil and an error message on failure

##TODO

• Regex matches

• Prefix matches

• Trie compression