54 lines
1.6 KiB
Lua
54 lines
1.6 KiB
Lua
function log(msg)
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ngx.log(ngx.STDERR, tostring(msg))
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end
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local ctx = {}
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function ctx:setWantedScripts(graph)
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self._wanted_scripts = graph
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end
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function ctx:loadFromConfig(conf)
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ctx:setWantedScripts(conf.wantedScripts)
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ctx:loadChain()
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end
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function ctx:loadChain()
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self.compiled_chain = {}
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for module_name, module_config in pairs(self._wanted_scripts) do
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local module = require('scripts.' .. module_name)
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local module_state = module.init(module_config)
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-- TODO is it possible to make module_config readonly?
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table.insert(self.compiled_chain, {module, module_config, module_state})
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end
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end
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function ctx:onRequest()
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local request_uri = ngx.var.uri
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-- find out which modules to call based on their regexes
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local callbacks_to_call = {}
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for _, filter in ipairs(self.compiled_chain) do
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local module, module_config, state = unpack(filter)
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for callback_regex, callback_function in pairs(module.callbacks) do
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local match, error = ngx.re.match(request_uri, callback_regex)
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if match then
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table.insert(callbacks_to_call, {module, callback_function, module_config, state})
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end
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end
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end
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for _, tuple in ipairs(callbacks_to_call) do
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local module, callback_function, config, state = unpack(tuple)
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local status_code, body = callback_function(config, state)
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if status_code ~= nil then
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log('filtered by module ' .. module.name)
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ngx.status = status_code
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ngx.say(body or "request denied")
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ngx.exit(status_code)
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end
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end
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end
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return ctx
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