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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
import (
"fmt"
"io"
"strings"
"testing"
"slices"
)
func TestRoutingFirstSegment(t *testing.T) {
for _, test := range []struct {
in string
want []string
}{
{"/a/b/c", []string{"a", "b", "c"}},
{"/a/b/", []string{"a", "b", "/"}},
{"/", []string{"/"}},
{"/a/%62/c", []string{"a", "b", "c"}},
{"/a%2Fb%2fc", []string{"a/b/c"}},
} {
var got []string
rest := test.in
for len(rest) > 0 {
var seg string
seg, rest = firstSegment(rest)
got = append(got, seg)
}
if !slices.Equal(got, test.want) {
t.Errorf("%q: got %v, want %v", test.in, got, test.want)
}
}
}
// TODO: test host and method
var testTree *routingNode
func getTestTree() *routingNode {
if testTree == nil {
testTree = buildTree("/a", "/a/b", "/a/{x}",
"/g/h/i", "/g/{x}/j",
"/a/b/{x...}", "/a/b/{y}", "/a/b/{$}")
}
return testTree
}
func buildTree(pats ...string) *routingNode {
root := &routingNode{}
for _, p := range pats {
pat, err := parsePattern(p)
if err != nil {
panic(err)
}
root.addPattern(pat, nil)
}
return root
}
func TestRoutingAddPattern(t *testing.T) {
want := `"":
"":
"a":
"/a"
"":
"/a/{x}"
"b":
"/a/b"
"":
"/a/b/{y}"
"/":
"/a/b/{$}"
MULTI:
"/a/b/{x...}"
"g":
"":
"j":
"/g/{x}/j"
"h":
"i":
"/g/h/i"
`
var b strings.Builder
getTestTree().print(&b, 0)
got := b.String()
if got != want {
t.Errorf("got\n%s\nwant\n%s", got, want)
}
}
type testCase struct {
method, host, path string
wantPat string // "" for nil (no match)
wantMatches []string
}
func TestRoutingNodeMatch(t *testing.T) {
test := func(tree *routingNode, tests []testCase) {
t.Helper()
for _, test := range tests {
gotNode, gotMatches := tree.match(test.host, test.method, test.path)
got := ""
if gotNode != nil {
got = gotNode.pattern.String()
}
if got != test.wantPat {
t.Errorf("%s, %s, %s: got %q, want %q", test.host, test.method, test.path, got, test.wantPat)
}
if !slices.Equal(gotMatches, test.wantMatches) {
t.Errorf("%s, %s, %s: got matches %v, want %v", test.host, test.method, test.path, gotMatches, test.wantMatches)
}
}
}
test(getTestTree(), []testCase{
{"GET", "", "/a", "/a", nil},
{"Get", "", "/b", "", nil},
{"Get", "", "/a/b", "/a/b", nil},
{"Get", "", "/a/c", "/a/{x}", []string{"c"}},
{"Get", "", "/a/b/", "/a/b/{$}", nil},
{"Get", "", "/a/b/c", "/a/b/{y}", []string{"c"}},
{"Get", "", "/a/b/c/d", "/a/b/{x...}", []string{"c/d"}},
{"Get", "", "/g/h/i", "/g/h/i", nil},
{"Get", "", "/g/h/j", "/g/{x}/j", []string{"h"}},
})
tree := buildTree(
"/item/",
"POST /item/{user}",
"GET /item/{user}",
"/item/{user}",
"/item/{user}/{id}",
"/item/{user}/new",
"/item/{$}",
"POST alt.com/item/{user}",
"GET /headwins",
"HEAD /headwins",
"/path/{p...}")
test(tree, []testCase{
{"GET", "", "/item/jba",
"GET /item/{user}", []string{"jba"}},
{"POST", "", "/item/jba",
"POST /item/{user}", []string{"jba"}},
{"HEAD", "", "/item/jba",
"GET /item/{user}", []string{"jba"}},
{"get", "", "/item/jba",
"/item/{user}", []string{"jba"}}, // method matches are case-sensitive
{"POST", "", "/item/jba/17",
"/item/{user}/{id}", []string{"jba", "17"}},
{"GET", "", "/item/jba/new",
"/item/{user}/new", []string{"jba"}},
{"GET", "", "/item/",
"/item/{$}", []string{}},
{"GET", "", "/item/jba/17/line2",
"/item/", nil},
{"POST", "alt.com", "/item/jba",
"POST alt.com/item/{user}", []string{"jba"}},
{"GET", "alt.com", "/item/jba",
"GET /item/{user}", []string{"jba"}},
{"GET", "", "/item",
"", nil}, // does not match
{"GET", "", "/headwins",
"GET /headwins", nil},
{"HEAD", "", "/headwins", // HEAD is more specific than GET
"HEAD /headwins", nil},
{"GET", "", "/path/to/file",
"/path/{p...}", []string{"to/file"}},
{"GET", "", "/path/*",
"/path/{p...}", []string{"*"}},
})
// A pattern ending in {$} should only match URLS with a trailing slash.
pat1 := "/a/b/{$}"
test(buildTree(pat1), []testCase{
{"GET", "", "/a/b", "", nil},
{"GET", "", "/a/b/", pat1, nil},
{"GET", "", "/a/b/c", "", nil},
{"GET", "", "/a/b/c/d", "", nil},
})
// A pattern ending in a single wildcard should not match a trailing slash URL.
pat2 := "/a/b/{w}"
test(buildTree(pat2), []testCase{
{"GET", "", "/a/b", "", nil},
{"GET", "", "/a/b/", "", nil},
{"GET", "", "/a/b/c", pat2, []string{"c"}},
{"GET", "", "/a/b/c/d", "", nil},
})
// A pattern ending in a multi wildcard should match both URLs.
pat3 := "/a/b/{w...}"
test(buildTree(pat3), []testCase{
{"GET", "", "/a/b", "", nil},
{"GET", "", "/a/b/", pat3, []string{""}},
{"GET", "", "/a/b/c", pat3, []string{"c"}},
{"GET", "", "/a/b/c/d", pat3, []string{"c/d"}},
})
// All three of the above should work together.
test(buildTree(pat1, pat2, pat3), []testCase{
{"GET", "", "/a/b", "", nil},
{"GET", "", "/a/b/", pat1, nil},
{"GET", "", "/a/b/c", pat2, []string{"c"}},
{"GET", "", "/a/b/c/d", pat3, []string{"c/d"}},
})
}
func TestMatchingMethods(t *testing.T) {
hostTree := buildTree("GET a.com/", "PUT b.com/", "POST /foo/{x}")
for _, test := range []struct {
name string
tree *routingNode
host, path string
want string
}{
{
"post",
buildTree("POST /"), "", "/foo",
"POST",
},
{
"get",
buildTree("GET /"), "", "/foo",
"GET,HEAD",
},
{
"host",
hostTree, "", "/foo",
"",
},
{
"host",
hostTree, "", "/foo/bar",
"POST",
},
{
"host2",
hostTree, "a.com", "/foo/bar",
"GET,HEAD,POST",
},
{
"host3",
hostTree, "b.com", "/bar",
"PUT",
},
{
// This case shouldn't come up because we only call matchingMethods
// when there was no match, but we include it for completeness.
"empty",
buildTree("/"), "", "/",
"",
},
} {
t.Run(test.name, func(t *testing.T) {
ms := map[string]bool{}
test.tree.matchingMethods(test.host, test.path, ms)
keys := mapKeys(ms)
slices.Sort(keys)
got := strings.Join(keys, ",")
if got != test.want {
t.Errorf("got %s, want %s", got, test.want)
}
})
}
}
func (n *routingNode) print(w io.Writer, level int) {
indent := strings.Repeat(" ", level)
if n.pattern != nil {
fmt.Fprintf(w, "%s%q\n", indent, n.pattern)
}
if n.emptyChild != nil {
fmt.Fprintf(w, "%s%q:\n", indent, "")
n.emptyChild.print(w, level+1)
}
var keys []string
n.children.eachPair(func(k string, _ *routingNode) bool {
keys = append(keys, k)
return true
})
slices.Sort(keys)
for _, k := range keys {
fmt.Fprintf(w, "%s%q:\n", indent, k)
n, _ := n.children.find(k)
n.print(w, level+1)
}
if n.multiChild != nil {
fmt.Fprintf(w, "%sMULTI:\n", indent)
n.multiChild.print(w, level+1)
}
}
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