implemented simple permissions manager

Author: serg-kozhemyakin

permissions_manager/init.lua

@@ -0,0 +1,105 @@
+--- permissions manager.
+--
+-- # Capabilities
+--
+-- # Usage
+--
+-- * Add `require "permissions_manager"` to your `config.rc`.
+-- * Copy example of permissions.cfg to ~/.local/share/luakit/permissions.cfg
+-- * Edit its content according to your needs
+--
+-- # Troubleshooting
+--
+-- # Files and Directories
+--
+-- @module permissions_manager
+-- @author Serg Kozhemyakin <serg.kozhemyakin@gmail.com>
+-- @copyright 2017-2018 Serg Kozhemyakin <serg.kozhemyakin@gmail.com>
+
+local webview = require ("webview")
+local lousy = require("lousy")
+
+local function to_grant_or_not_to_grant(cfg, uri)
+    local grant = nil
+    local scheme = uri.scheme
+    local host = uri.host
+    local port = uri.port
+    local default = false
+
+    if cfg then
+        default = cfg['default'] or 'denied' -- by default deny or requests
+        local key
+        if default == 'allowed' then
+            default = true
+            key = 'denied'
+        else
+            default = false
+            key = 'allowed'
+        end
+        cfg = cfg[key]
+        if not cfg then return grant end
+
+        local origin = scheme.."://"..host..":"..port;
+        for _,v in ipairs(cfg) do
+            if string.match(origin, v) then
+                grant = not default
+                break
+            end
+            if grant ~= nil then break end
+        end
+    end
+    -- check for default value if there's no host specific value
+    return grant == nil and default or grant
+end
+
+local function check_permission_request(view, what, params)
+    local grant = nil
+    local uri = lousy.uri.parse(view.uri)
+    msg.info("Checking permission '"..what.."' for '"..uri.scheme.."://"..uri.host..":"..uri.port)
+
+    local config = luakit.data_dir .. '/permissions.cfg'
+    msg.info("Loading config file '"..config.."'")
+
+    local f,r = io.open(config, "r")
+    if f then
+        local cfg = f:read("*all")
+        local permissions = nil
+        local code, message = loadstring("return "..cfg)
+        f:close()
+        if message then
+            msg.error("Loading cfg failed: "..message)
+            return false
+        else
+            permissions = code()
+        end
+        if not permissions or not permissions[what] then
+            msg.warn("There's no key '"..what.."' in loaded permissions")
+            return false
+        end
+        permissions = permissions[what]
+        if params then
+            if type(params) == 'table' then
+                for k,_ in pairs(params) do
+                    grant = to_grant_or_not_to_grant(permissions[params][k], uri)
+                    if grant ~= nil and not grant then break end
+                end
+            else
+                grant = to_grant_or_not_to_grant(permissions[params], uri)
+            end
+        else
+            grant = to_grant_or_not_to_grant(permissions, uri)
+        end
+    else
+        msg.error("Failed to open config file: "..r)
+    end
+
+    grant = grant == nil and false or grant
+    msg.info("Permission '"..what.."' for '"..uri.scheme.."://"..uri.host..":"..uri.port.." was "..(grant and "granted" or "denied"))
+    return grant
+end
+
+webview.add_signal("init", function (view)
+    view:add_signal("permission-request", check_permission_request)
+end)
+
+-- vim: et:sw=4:ts=8:sts=4:tw=80

permissions_manager/permissions.cfg.example

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+{
+    ["notification"] = {
+      ["allowed"] = {
+        "www.bennish.net",
+      },
+      ["denied"] = {
+        "www.google.com",
+      },
+      -- "allowed" or "denied" by default.
+      -- if not specified -- denied by default
+      ["default"] = "denied",
+      -- if default set to 'allowed' then checking 'denied' section
+      -- if default set to 'denied' then checking 'allowed' section
+    },
+    ["geolocation"] = {
+      ["denied"] = {
+      },
+      ["allowed"] = {
+        -- values are regexps
+        "https://.*%.google%..+",
+      },
+      ["default"] = "denied",
+    },
+    ["install-missing-media-plugins"] = {
+      ["default"] = "denied",
+    },
+    ["user-media"] = {
+        ["audio"] = {
+          ["default"] = "denied",
+        },
+        ["video"] = {
+          ["default"] = "denied",
+        },
+    },
+}