Class: Weixin::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/weixin/middleware.rb

Constant Summary collapse

POST_BODY = 
'rack.input'.freeze
WEIXIN_MSG = 
'weixin.msg'.freeze
WEIXIN_MSG_RAW = 
'weixin.msg.raw'.freeze

Instance Method Summary collapse

Constructor Details

#initialize(app, app_token, path) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/weixin/middleware.rb', line 12

def initialize(app, app_token, path)
    @app = app
    @app_token = app_token
    @path = path
end

Instance Method Details

#_call(env) ⇒ Object 



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# File 'lib/weixin/middleware.rb', line 22

def _call(env)
    if @path == env['PATH_INFO'].to_s && ['GET', 'POST'].include?(env['REQUEST_METHOD'])

        @req = Rack::Request.new(env)
        return invalid_request! unless request_is_valid?
        return [
            200, 
            { 'Content-type' => 'text/plain', 'Content-length' => @req.params['echostr'].length.to_s }, 
            [ @req.params['echostr'] ]
        ] if @req.get?

        raw_msg = env[POST_BODY].read
        begin
            env.update WEIXIN_MSG => Weixin::Message.factory(raw_msg), WEIXIN_MSG_RAW => raw_msg
            @app.call(env)
        rescue Exception => e
            return [500, { 'Content-type' => 'text/html' }, ["Message parsing error: #{e.to_s}"]]
        end
    else
        @app.call(env)
    end

end

#call(env) ⇒ Object 



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# File 'lib/weixin/middleware.rb', line 18

def call(env)
    dup._call(env)
end

#invalid_request! ⇒ Object 



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# File 'lib/weixin/middleware.rb', line 46

def invalid_request!
    [401, { 'Content-type' => 'text/html', 'Content-Length' => '0'}, []]
end

#request_is_valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/weixin/middleware.rb', line 50

def request_is_valid?
    begin
        param_array = [@app_token, @req.params['timestamp'], @req.params['nonce']]
        sign = Digest::SHA1.hexdigest( param_array.sort.join )
        sign == @req.params['signature'] ? true : false
    rescue
        false
    end
end