preserve url.Parse behaviour before go1.19

Closes: #157

Signed-off-by: Shengjing Zhu <zhsj@debian.org>

normalizer.go

@@ -40,7 +40,7 @@ const fileScheme = "file"
 //
 // The base path argument is assumed to be canonicalized (e.g. using normalizeBase()).
 func normalizeURI(refPath, base string) string {
-	refURL, err := url.Parse(refPath)
+	refURL, err := parseURL(refPath)
 	if err != nil {
 		specLogger.Printf("warning: invalid URI in $ref  %q: %v", refPath, err)
 		refURL, refPath = repairURI(refPath)
@@ -58,7 +58,7 @@ func normalizeURI(refPath, base string) string {
 		return refURL.String()
 	}
 
-	baseURL, _ := url.Parse(base)
+	baseURL, _ := parseURL(base)
 	if path.IsAbs(refURL.Path) {
 		baseURL.Path = refURL.Path
 	} else if refURL.Path != "" {
@@ -84,7 +84,6 @@ func normalizeURI(refPath, base string) string {
 // There is a special case for schemas that are anchored with an "id":
 // in that case, the rebasing is performed // against the id only if this is an anchor for the initial root document.
 // All other intermediate "id"'s found along the way are ignored for the purpose of rebasing.
-//
 func denormalizeRef(ref *Ref, originalRelativeBase, id string) Ref {
 	debugLog("denormalizeRef called:\n$ref: %q\noriginal: %s\nroot ID:%s", ref.String(), originalRelativeBase, id)
 
@@ -94,7 +93,7 @@ func denormalizeRef(ref *Ref, originalRelativeBase, id string) Ref {
 	}
 
 	if id != "" {
-		idBaseURL, err := url.Parse(id)
+		idBaseURL, err := parseURL(id)
 		if err == nil { // if the schema id is not usable as a URI, ignore it
 			if ref, ok := rebase(ref, idBaseURL, true); ok { // rebase, but keep references to root unchaged (do not want $ref: "")
 				// $ref relative to the ID of the schema in the root document
@@ -103,7 +102,7 @@ func denormalizeRef(ref *Ref, originalRelativeBase, id string) Ref {
 		}
 	}
 
-	originalRelativeBaseURL, _ := url.Parse(originalRelativeBase)
+	originalRelativeBaseURL, _ := parseURL(originalRelativeBase)
 
 	r, _ := rebase(ref, originalRelativeBaseURL, false)
 
@@ -168,7 +167,7 @@ func normalizeRef(ref *Ref, relativeBase string) *Ref {
 //
 // See also: https://en.wikipedia.org/wiki/File_URI_scheme
 func normalizeBase(in string) string {
-	u, err := url.Parse(in)
+	u, err := parseURL(in)
 	if err != nil {
 		specLogger.Printf("warning: invalid URI in RelativeBase  %q: %v", in, err)
 		u, in = repairURI(in)

normalizer_nonwindows.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 // Copyright 2015 go-swagger maintainers
@@ -34,7 +35,7 @@ func absPath(in string) string {
 }
 
 func repairURI(in string) (*url.URL, string) {
-	u, _ := url.Parse("")
+	u, _ := parseURL("")
 	debugLog("repaired URI: original: %q, repaired: %q", in, "")
 	return u, ""
 }

normalizer_windows.go

@@ -60,13 +60,13 @@ func repairURI(in string) (*url.URL, string) {
 	const prefix = fileScheme + "://"
 	if !strings.HasPrefix(in, prefix) {
 		// giving up: resolve to empty path
-		u, _ := url.Parse("")
+		u, _ := parseURL("")
 
 		return u, ""
 	}
 
 	// attempt the repair, stripping the scheme should be sufficient
-	u, _ := url.Parse(strings.TrimPrefix(in, prefix))
+	u, _ := parseURL(strings.TrimPrefix(in, prefix))
 	debugLog("repaired URI: original: %q, repaired: %q", in, u.String())
 
 	return u, u.String()

schema.go

@@ -17,7 +17,6 @@ package spec
 import (
 	"encoding/json"
 	"fmt"
-	"net/url"
 	"strings"
 
 	"github.com/go-openapi/jsonpointer"
@@ -145,7 +144,7 @@ func (r *SchemaURL) fromMap(v map[string]interface{}) error {
 	}
 	if vv, ok := v["$schema"]; ok {
 		if str, ok := vv.(string); ok {
-			u, err := url.Parse(str)
+			u, err := parseURL(str)
 			if err != nil {
 				return err
 			}

url_go18.go

@@ -0,0 +1,8 @@
+//go:build !go1.19
+// +build !go1.19
+
+package spec
+
+import "net/url"
+
+var parseURL = url.Parse

url_go19.go

@@ -0,0 +1,14 @@
+//go:build go1.19
+// +build go1.19
+
+package spec
+
+import "net/url"
+
+func parseURL(s string) (*url.URL, error) {
+	u, err := url.Parse(s)
+	if err == nil {
+		u.OmitHost = false
+	}
+	return u, err
+}