add regular expression matching to --output-http-rewrite-url

settings_url_map.go

@@ -3,11 +3,12 @@ package main
 import (
 	"errors"
 	"fmt"
+	"regexp"
 	"strings"
 )
 
 type urlRewrite struct {
-	src    string
+	src    *regexp.Regexp
 	target string
 }
 
@@ -22,14 +23,18 @@ func (r *UrlRewriteMap) Set(value string) error {
 	if len(valArr) < 2 {
 		return errors.New("need both src and target, colon-delimited (ex. /a:/b).")
 	}
-	*r = append(*r, urlRewrite{src: valArr[0], target: valArr[1]})
+	regexp, err := regexp.Compile(valArr[0])
+	if err != nil {
+		return err
+	}
+	*r = append(*r, urlRewrite{src: regexp, target: valArr[1]})
 	return nil
 }
 
 func (r *UrlRewriteMap) Rewrite(path string) string {
 	for _, f := range *r {
-		if f.src == path {
-			return f.target
+		if f.src.MatchString(path) {
+			return f.src.ReplaceAllString(path, f.target)
 		}
 	}
 	return path

settings_url_map_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 )
 
-func TestUrlRewriteMap(t *testing.T) {
+func TestUrlRewriteMap_1(t *testing.T) {
 	var url string
 
 	rewrites := UrlRewriteMap{}
@@ -15,7 +15,6 @@ func TestUrlRewriteMap(t *testing.T) {
 	}
 
 	url = "/abc"
-
 	if rewrites.Rewrite(url) == url {
 		t.Error("Request url should have been rewritten, wasn't")
 	}
@@ -25,3 +24,29 @@ func TestUrlRewriteMap(t *testing.T) {
 		t.Error("Request url should not have been rewritten, was")
 	}
 }
+
+func TestUrlRewriteMap_2(t *testing.T) {
+	var url string
+
+	rewrites := UrlRewriteMap{}
+
+	err := rewrites.Set("/v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	if err != nil {
+		t.Error("Should not error on /v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	}
+
+	url = "/v1/user/joe/ping"
+	if rewrites.Rewrite(url) == url {
+		t.Error("Request url should have been rewritten, wasn't")
+	}
+
+	url = "/v1/user/joe/ping"
+	if rewrites.Rewrite(url) != "/v2/user/joe/ping" {
+		t.Error("Request url should have been rewritten, wasn't")
+	}
+
+	url = "/v1/user/ping"
+	if rewrites.Rewrite(url) != url {
+		t.Error("Request url should not have been rewritten, was")
+	}
+}