Added ingress support (#7)

* Added ingress support

* Removed entry because it is not used and Added manifest.json

* Added default start screen

mopidy/rootfs/etc/nginx/lua/ha-auth.lua

@@ -0,0 +1,83 @@
+local http = require "resty.http"
+local auths = ngx.shared.auths
+
+function authenticate()
+
+    --- Test Authentication header is set and with a value
+    local header = ngx.req.get_headers()['Authorization']
+    if header == nil or header:find(" ") == nil then
+        return false
+    end
+
+    local divider = header:find(' ')
+    if header:sub(0, divider-1) ~= 'Basic' then
+       return false
+    end
+
+    local auth = ngx.decode_base64(header:sub(divider+1))
+    if auth == nil or auth:find(':') == nil then
+        return false
+    end
+
+    divider = auth:find(':')
+    local username = auth:sub(0, divider-1)
+    local password = auth:sub(divider+1)
+
+    --- Check if authentication is cached
+    if auths:get(username) == password then
+        ngx.log(ngx.DEBUG, "Authenticated user against Home Assistant (cache).")
+        return true
+    end
+
+    --- HTTP request against Hassio API
+    local httpc = http.new()
+    local res, err = httpc:request_uri("http://hassio/auth", {
+        method = "POST",
+        body = ngx.encode_args({["username"]=username, ["password"]=password}),
+        headers = {
+            ["Content-Type"] = "application/x-www-form-urlencoded",
+            ["X-HASSIO-KEY"] = os.getenv("HASSIO_TOKEN"),
+        },
+        keepalive_timeout = 60,
+        keepalive_pool = 10
+    })
+
+    --- Error during API request
+    if err then
+        ngx.log(ngx.WARN, "Error during Hassio user authentication.", err)
+        return false
+    end
+
+    --- No result? Something went wrong...
+    if not res then
+        ngx.log(ngx.WARN, "Error during Hassio user authentication.")
+        return false
+    end
+
+    --- Valid response, the username/password is valid
+    if res.status == 200 then
+        ngx.log(ngx.INFO, "Authenticated user against Home Assistant.")
+        auths:set(username, password, 60)
+        return true
+    end
+
+    --- Whatever the response is, it is invalid
+    ngx.log(ngx.WARN, "Authentication against Home Assistant failed!")
+    return false
+end
+
+-- Only authenticate if its not disabled
+if not os.getenv('DISABLE_HA_AUTHENTICATION') then
+
+    --- Try to authenticate against HA
+    local authenticated = authenticate()
+
+    --- If authentication failed, throw a basic auth
+    if not authenticated then
+       ngx.header.content_type = 'text/plain'
+       ngx.header.www_authenticate = 'Basic realm="Home Assistant"'
+       ngx.status = ngx.HTTP_UNAUTHORIZED
+       ngx.say('401 Access Denied')
+       ngx.exit(ngx.HTTP_UNAUTHORIZED)
+    end
+end