Start NodeInfo implementation

models/forgefed/nodeinfo.go

@@ -0,0 +1,78 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package forgefed
+
+import (
+	"net/url"
+
+	"code.gitea.io/gitea/modules/validation"
+	"github.com/valyala/fastjson"
+)
+
+type (
+	SourceType string
+)
+
+type SourceTypes []SourceType
+
+const (
+	ForgejoSourceType SourceType = "frogejo"
+)
+
+var KnownSourceTypes = SourceTypes{
+	ForgejoSourceType,
+}
+
+// NodeInfo data type
+// swagger:model
+type NodeInfoWellKnown struct {
+	Href string
+}
+
+func NodeInfoWellKnownUnmarshalJSON(data []byte) (NodeInfoWellKnown, error) {
+	p := fastjson.Parser{}
+	val, err := p.ParseBytes(data)
+	if err != nil {
+		return NodeInfoWellKnown{}, err
+	}
+	href := string(val.GetStringBytes("links", "0", "href"))
+	return NodeInfoWellKnown{Href: href}, nil
+}
+
+func NewNodeInfoWellKnown(body []byte) (NodeInfoWellKnown, error) {
+	result, err := NodeInfoWellKnownUnmarshalJSON(body)
+	if err != nil {
+		return NodeInfoWellKnown{}, err
+	}
+
+	if valid, outcome := validation.IsValid(result); !valid {
+		return NodeInfoWellKnown{}, outcome
+	}
+
+	return NodeInfoWellKnown{}, nil
+}
+
+// Validate collects error strings in a slice and returns this
+func (node NodeInfoWellKnown) Validate() []string {
+	var result []string
+	result = append(result, validation.ValidateNotEmpty(node.Href, "Href")...)
+
+	parsedUrl, err := url.Parse(node.Href)
+	if err != nil {
+		result = append(result, err.Error())
+		return result
+	}
+
+	if parsedUrl.Host == "" {
+		result = append(result, "Href has to be absolute")
+	}
+
+	result = append(result, validation.ValidateOneOf(parsedUrl.Scheme, []string{"http", "https"})...)
+
+	if parsedUrl.RawQuery != "" {
+		result = append(result, "Href may not contain query")
+	}
+
+	return result
+}