feat: store matched routes in request

HISTORY.md

@@ -8,6 +8,7 @@ unreleased
   * deps: path-to-regexp@3.0.0
   * deps: eslint@6.8.0
   * deps: eslint-plugin-markdown@1.0.1
+  * Store matched routes in request #34 #86
 
 2.0.0-alpha.1 / 2018-07-27
 ==========================

index.js

@@ -166,7 +166,8 @@ Router.prototype.handle = function handle(req, res, callback) {
   // manage inter-router variables
   var parentParams = req.params
   var parentUrl = req.baseUrl || ''
-  var done = restore(callback, req, 'baseUrl', 'next', 'params')
+  var parentMatchedRoutes = req.matchedRoutes
+  var done = restore(callback, req, 'baseUrl', 'next', 'params', 'matchedRoutes')
 
   // setup next layer
   req.next = next
@@ -199,6 +200,7 @@ Router.prototype.handle = function handle(req, res, callback) {
       req.baseUrl = parentUrl
       req.url = protohost + removed + req.url.substr(protohost.length)
       removed = ''
+      req.matchedRoutes = parentMatchedRoutes
     }
 
     // signal to exit router
@@ -287,6 +289,11 @@ Router.prototype.handle = function handle(req, res, callback) {
         return next(layerError || err)
       }
 
+      if (layer.path) {
+        req.matchedRoutes = req.matchedRoutes || []
+        req.matchedRoutes.push(layer.matchedPath.path)
+      }
+
       if (route) {
         return layer.handle_request(req, res, next)
       }
@@ -342,7 +349,7 @@ Router.prototype.process_params = function process_params(layer, called, req, re
   var params = this.params
 
   // captured parameters from the layer, keys and values
-  var keys = layer.keys
+  var keys = layer.matchedPath && layer.matchedPath.keys
 
   // fast track
   if (!keys || keys.length === 0) {

lib/layer.js

@@ -33,18 +33,18 @@ function Layer(p, options, fn) {
     return new Layer(p, options, fn)
   }
 
-  debug('new %o', path)
+  debug('new %o', paths)
   var opts = options || {}
 
   // If not in strict allow both with or without trailing slash
-  var path = p
+  var paths = p
   if (!opts.strict) {
-    if (!Array.isArray(path) && path !== '/' && path[path.length - 1] === '/') {
-      path = path.substr(0, path.length - 1)
+    if (!Array.isArray(paths) && paths !== '/' && paths[paths.length - 1] === '/') {
+      paths = paths.substr(0, paths.length - 1)
     } else {
-      for (var i = 0; i < path.length; i++) {
-        if (path[i] !== '/' && path[i][path[i].length - 1] === '/') {
-          path[i] = path[i].substr(0, path[i].length - 1)
+      for (var i = 0; i < paths.length; i++) {
+        if (paths[i] !== '/' && paths[i][paths[i].length - 1] === '/') {
+          paths[i] = paths[i].substr(0, paths[i].length - 1)
         }
       }
     }
@@ -54,11 +54,22 @@ function Layer(p, options, fn) {
   this.name = fn.name || '<anonymous>'
   this.params = undefined
   this.path = undefined
-  this.regexp = pathRegexp(path, this.keys = [], opts)
+  this.matchedPath = undefined
 
   // set fast path flags
-  this.regexp.fast_star = path === '*'
-  this.regexp.fast_slash = path === '/' && opts.end === false
+  this.fastStar = paths === '*'
+  this.fastSlash = paths === '/' && opts.end === false
+
+  this.paths = (!Array.isArray(paths) ? [paths] : paths).map(function (path) {
+    var keys = []
+    var pathObj = {
+      path: path,
+      keys: keys,
+      regexp: pathRegexp(path, keys, opts)
+    }
+
+    return pathObj
+  })
 }
 
 /**
@@ -137,29 +148,39 @@ Layer.prototype.handle_request = function handle(req, res, next) {
 
 Layer.prototype.match = function match(path) {
   var match
+  var checkPath
 
   if (path != null) {
     // fast path non-ending match for / (any path matches)
-    if (this.regexp.fast_slash) {
+    if (this.fastSlash) {
       this.params = {}
       this.path = ''
+      this.matchedPath = this.paths[0]
       return true
     }
 
     // fast path for * (everything matched in a param)
-    if (this.regexp.fast_star) {
+    if (this.fastStar) {
       this.params = {'0': decode_param(path)}
       this.path = path
+      this.matchedPath = this.paths[0]
       return true
     }
 
     // match the path
-    match = this.regexp.exec(path)
+    for (var i = 0; i < this.paths.length; i++) {
+      checkPath = this.paths[i]
+      if (match = checkPath.regexp.exec(path)) {
+        this.matchedPath = checkPath
+        break
+      }
+    }
   }
 
   if (!match) {
     this.params = undefined
     this.path = undefined
+    this.matchedPath = undefined
     return false
   }
 
@@ -172,7 +193,7 @@ Layer.prototype.match = function match(path) {
   var params = this.params
 
   for (var i = 1; i < match.length; i++) {
-    var key = keys[i - 1]
+    var key = this.matchedPath.keys[i - 1]
     var prop = key.name
     var val = decode_param(match[i])
 

test/router.js

@@ -1246,6 +1246,143 @@ describe('Router', function () {
         .expect(200, 'saw GET /bar', done)
     })
   })
+
+  describe('req.matchedRoutes', function () {
+    it('should be set if there is a match', function (done) {
+      var router = new Router()
+      var server = createServer(router)
+      var matchedRoutes
+
+      router.get('/foo', function (req, res, next) {
+        matchedRoutes = req.matchedRoutes
+        next()
+      })
+      router.use(saw)
+
+      request(server)
+          .get('/foo')
+          .expect(200, 'saw GET /foo', function (err, res) {
+            assert.deepEqual(matchedRoutes, ['/foo'])
+            done(err)
+          })
+    })
+
+    it('should be undefined if there is not a match', function (done) {
+      var router = new Router()
+      var server = createServer(router)
+      var matchedRoutes
+
+      router.use(function (req, res, next) {
+        matchedRoutes = req.matchedRoutes
+        next()
+      })
+
+      request(server)
+        .get('/foo')
+        .expect(404, function (err, res) {
+          assert.strictEqual(matchedRoutes, undefined)
+          done(err)
+        })
+    })
+
+    it('should work with sub-routers', function (done) {
+      var router = new Router()
+      var fooRouter = new Router()
+      var server = createServer(router)
+      var matchedFooRoutes
+      var matchedBarRoutes
+
+      router.use('/foo', function (req, res, next) {
+        matchedFooRoutes = req.matchedRoutes
+        next()
+      }, fooRouter)
+      fooRouter.get('/bar', function (req, res, next) {
+        matchedBarRoutes = req.matchedRoutes
+        next()
+      })
+      router.use(saw)
+
+      request(server)
+        .get('/foo/bar')
+        .expect(200, 'saw GET /foo/bar', function (err, res) {
+          assert.deepEqual(matchedFooRoutes, ['/foo'])
+          assert.deepEqual(matchedBarRoutes, ['/foo', '/bar'])
+          done(err)
+        })
+    })
+
+    it('should be undefined if sub-router did not match', function (done) {
+      var router = new Router()
+      var fooRouter = new Router()
+      var server = createServer(router)
+      var matchedRoutes
+
+      router.use('/foo', fooRouter)
+      fooRouter.get('/bar', function (req, res, next) {
+        matchedRoutes = req.matchedRoutes
+        next()
+      })
+      router.use(saw)
+
+      request(server)
+        .get('/foo/baz')
+        .expect(200, 'saw GET /foo/baz', function (err, res) {
+          assert.strictEqual(matchedRoutes, undefined)
+          done(err)
+        })
+    })
+
+    it('should work with regexp-defined routes', function (done) {
+      var router = new Router()
+      var server = createServer(router)
+      var matchedRoutes
+      var regexp = /fo+/
+
+      router.get(regexp, function (req, res, next) {
+        matchedRoutes = req.matchedRoutes
+        next()
+      })
+      router.use(saw)
+
+      request(server)
+        .get('/foo')
+        .expect(200, 'saw GET /foo', function (err, res) {
+          assert.deepEqual(matchedRoutes, [regexp])
+          done(err)
+        })
+    })
+
+    it('should support routes defined with arrays of paths', function (done) {
+      var router = new Router()
+      var server = createServer(router)
+      var matchedRoutes
+
+      router.get(['/foo', '/bar/:id'], function (req, res, next) {
+        matchedRoutes = req.matchedRoutes
+        next()
+      })
+      router.use(saw)
+
+      request(server)
+        .get('/foo')
+        .expect(200, 'saw GET /foo', function (err, res) {
+          if (err) {
+            return done(err)
+          }
+          assert.deepEqual(matchedRoutes, ['/foo'])
+
+          request(server)
+            .get('/bar/1')
+            .expect(200, 'saw GET /bar/1', function (err, res) {
+              if (err) {
+                return done(err)
+              }
+              assert.deepEqual(matchedRoutes, ['/bar/:id'])
+              done()
+            })
+        })
+    })
+  })
 })
 
 function helloWorld(req, res) {