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and other conditions.\n\nI am dedicated to create scalable and easy to use tools, so this is one of them and I thought it would be nice if I could share it with you.\n\n\n## TL;DR\nCreate a tree of middleware nodes that may either be middlewares or combination of middlewares.\n\nNote: The tree is parsed in a DFS fashion.\n\nImportant Note: And Chainers are executed sequentially. OrChainers are using the Promise.any and as a result they are executed in parallel. I want to implement them soon. If anyone wants to contribute please go ahead :) \n\n\n### Usage Example\n\n```javascript\nimport { conditionalMiddleware, MiddlewareChainer, OrMiddlewareStrategy, AndMiddlewareStrategy } from 'express-conditional-tree-middleware';\n\n// Every Node class must have a applyMiddleware method in order to be used by a chainer\n\nclass IPLimitMiddlewareNode {    \n\n    applyMiddleware(app) {\n        return (req, res, next) =\u003e {\n            return new Promise((resolve, reject) =\u003e {\n                if(app.get('myIPs').indexOf(req.ip) \u003e -1) return resolve();\n                else reject();\n            });\n        };\n    }\n\n}\n\nclass AdminMiddlewareNode {\n\n    applyMiddleware(app) {\n        return (req, res, next) =\u003e {\n            return new Promise((resolve, reject) =\u003e {\n                if(req.body.admin === true) return resolve();\n                else reject();\n            });\n        };\n    }\n\n}\n\nclass TokenVerificationMiddlewareNode {\n\n    applyMiddleware(app) {\n        return (req, res, next) =\u003e {\n            return new Promise((resolve, reject) =\u003e {\n                if(token.verify()) return resolve();\n                reject();\n            });\n        }\n    }\n    \n}\n\n\nlet myRouter = express.Router();\n\n// Create two new strategies\nlet orChainer = new MiddlewareChainer(new OrMiddlewareStrategy());\nlet andChainer = new MiddlewareChainer(new AndMiddlewareStrategy());\n\n// Create the tree\nandChainer.add(new TokenVerificationMiddlewareNode());\nandChainer.add(new AdminMiddlewareNode());\norChainer.add(andChainer);\norChainer.add(new IPLimitMiddlewareNode());\n\n//\n//               Tree Structure\n//\n//                     Or\n//                   /   \\\n//                  /     \\\n//                 And    IpLimit \n//               /    \\\n//              /      \\\n// TokenVerification   Admin\n//\n\nmyRouter.use(\n  // conditionalMiddleware functions take as arguments the express app, a router that will apply \n  // the middleware tree, the root element of the tree and a callback error function\n  conditionalMiddleware(app, myRouter, orChainer, function(res) {\n      res.status(401).json({status: 'Unauthorized'});\n  })\n)\n```\n\n\n### Design Patterns Used\n\n* Strategy\n* Composite\n\n\n### License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdev-force%2Fexpress-conditional-tree-middleware","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdev-force%2Fexpress-conditional-tree-middleware","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdev-force%2Fexpress-conditional-tree-middleware/lists"}