1 files changed, 202 insertions, 0 deletions
diff --git a/vendor/github.com/go-openapi/spec/normalizer.go b/vendor/github.com/go-openapi/spec/normalizer.go
new file mode 100644
index 000000000..e8b600994
--- /dev/null
+++ b/vendor/github.com/go-openapi/spec/normalizer.go
@@ -0,0 +1,202 @@
+// Copyright 2015 go-swagger maintainers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package spec
+
+import (
+	"net/url"
+	"path"
+	"strings"
+)
+
+const fileScheme = "file"
+
+// normalizeURI ensures that all $ref paths used internally by the expander are canonicalized.
+//
+// NOTE(windows): there is a tolerance over the strict URI format on windows.
+//
+// The normalizer accepts relative file URLs like 'Path\File.JSON' as well as absolute file URLs like
+// 'C:\Path\file.Yaml'.
+//
+// Both are canonicalized with a "file://" scheme, slashes and a lower-cased path:
+// 'file:///c:/path/file.yaml'
+//
+// URLs can be specified with a file scheme, like in 'file:///folder/file.json' or
+// 'file:///c:\folder\File.json'.
+//
+// URLs like file://C:\folder are considered invalid (i.e. there is no host 'c:\folder') and a "repair"
+// is attempted.
+//
+// The base path argument is assumed to be canonicalized (e.g. using normalizeBase()).
+func normalizeURI(refPath, base string) string {
+	refURL, err := parseURL(refPath)
+	if err != nil {
+		specLogger.Printf("warning: invalid URI in $ref  %q: %v", refPath, err)
+		refURL, refPath = repairURI(refPath)
+	}
+
+	fixWindowsURI(refURL, refPath) // noop on non-windows OS
+
+	refURL.Path = path.Clean(refURL.Path)
+	if refURL.Path == "." {
+		refURL.Path = ""
+	}
+
+	r := MustCreateRef(refURL.String())
+	if r.IsCanonical() {
+		return refURL.String()
+	}
+
+	baseURL, _ := parseURL(base)
+	if path.IsAbs(refURL.Path) {
+		baseURL.Path = refURL.Path
+	} else if refURL.Path != "" {
+		baseURL.Path = path.Join(path.Dir(baseURL.Path), refURL.Path)
+	}
+	// copying fragment from ref to base
+	baseURL.Fragment = refURL.Fragment
+
+	return baseURL.String()
+}
+
+// denormalizeRef returns the simplest notation for a normalized $ref, given the path of the original root document.
+//
+// When calling this, we assume that:
+// * $ref is a canonical URI
+// * originalRelativeBase is a canonical URI
+//
+// denormalizeRef is currently used when we rewrite a $ref after a circular $ref has been detected.
+// In this case, expansion stops and normally renders the internal canonical $ref.
+//
+// This internal $ref is eventually rebased to the original RelativeBase used for the expansion.
+//
+// There is a special case for schemas that are anchored with an "id":
+// in that case, the rebasing is performed // against the id only if this is an anchor for the initial root document.
+// All other intermediate "id"'s found along the way are ignored for the purpose of rebasing.
+func denormalizeRef(ref *Ref, originalRelativeBase, id string) Ref {
+	debugLog("denormalizeRef called:\n$ref: %q\noriginal: %s\nroot ID:%s", ref.String(), originalRelativeBase, id)
+
+	if ref.String() == "" || ref.IsRoot() || ref.HasFragmentOnly {
+		// short circuit: $ref to current doc
+		return *ref
+	}
+
+	if 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
+				return ref
+			}
+		}
+	}
+
+	originalRelativeBaseURL, _ := parseURL(originalRelativeBase)
+
+	r, _ := rebase(ref, originalRelativeBaseURL, false)
+
+	return r
+}
+
+func rebase(ref *Ref, v *url.URL, notEqual bool) (Ref, bool) {
+	var newBase url.URL
+
+	u := ref.GetURL()
+
+	if u.Scheme != v.Scheme || u.Host != v.Host {
+		return *ref, false
+	}
+
+	docPath := v.Path
+	v.Path = path.Dir(v.Path)
+
+	if v.Path == "." {
+		v.Path = ""
+	} else if !strings.HasSuffix(v.Path, "/") {
+		v.Path += "/"
+	}
+
+	newBase.Fragment = u.Fragment
+
+	if strings.HasPrefix(u.Path, docPath) {
+		newBase.Path = strings.TrimPrefix(u.Path, docPath)
+	} else {
+		newBase.Path = strings.TrimPrefix(u.Path, v.Path)
+	}
+
+	if notEqual && newBase.Path == "" && newBase.Fragment == "" {
+		// do not want rebasing to end up in an empty $ref
+		return *ref, false
+	}
+
+	if path.IsAbs(newBase.Path) {
+		// whenever we end up with an absolute path, specify the scheme and host
+		newBase.Scheme = v.Scheme
+		newBase.Host = v.Host
+	}
+
+	return MustCreateRef(newBase.String()), true
+}
+
+// normalizeRef canonicalize a Ref, using a canonical relativeBase as its absolute anchor
+func normalizeRef(ref *Ref, relativeBase string) *Ref {
+	r := MustCreateRef(normalizeURI(ref.String(), relativeBase))
+	return &r
+}
+
+// normalizeBase performs a normalization of the input base path.
+//
+// This always yields a canonical URI (absolute), usable for the document cache.
+//
+// It ensures that all further internal work on basePath may safely assume
+// a non-empty, cross-platform, canonical URI (i.e. absolute).
+//
+// This normalization tolerates windows paths (e.g. C:\x\y\File.dat) and transform this
+// in a file:// URL with lower cased drive letter and path.
+//
+// See also: https://en.wikipedia.org/wiki/File_URI_scheme
+func normalizeBase(in string) string {
+	u, err := parseURL(in)
+	if err != nil {
+		specLogger.Printf("warning: invalid URI in RelativeBase  %q: %v", in, err)
+		u, in = repairURI(in)
+	}
+
+	u.Fragment = "" // any fragment in the base is irrelevant
+
+	fixWindowsURI(u, in) // noop on non-windows OS
+
+	u.Path = path.Clean(u.Path)
+	if u.Path == "." { // empty after Clean()
+		u.Path = ""
+	}
+
+	if u.Scheme != "" {
+		if path.IsAbs(u.Path) || u.Scheme != fileScheme {
+			// this is absolute or explicitly not a local file: we're good
+			return u.String()
+		}
+	}
+
+	// no scheme or file scheme with relative path: assume file and make it absolute
+	// enforce scheme file://... with absolute path.
+	//
+	// If the input path is relative, we anchor the path to the current working directory.
+	// NOTE: we may end up with a host component. Leave it unchanged: e.g. file://host/folder/file.json
+
+	u.Scheme = fileScheme
+	u.Path = absPath(u.Path) // platform-dependent
+	u.RawQuery = ""          // any query component is irrelevant for a base
+	return u.String()
+}