初始提交: Gitea 项目代码

modules/markup/render_link.go

@@ -0,0 +1,75 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markup
+
+import (
+	"context"
+	"net/url"
+	"path"
+	"strings"
+
+	"gitea.dev/modules/httplib"
+	"gitea.dev/modules/setting"
+)
+
+// resolveLinkRelative tries to resolve the link relative to the "{base}/{cur}", and returns the final link.
+// It only resolves the link, doesn't do any sanitization or validation, invalid links will be returned as is.
+func resolveLinkRelative(ctx context.Context, base, cur, link string, absolute bool) (finalLink string) {
+	linkURL, err := url.Parse(link)
+	if err != nil {
+		return link // invalid URL, return as is
+	}
+	if linkURL.Scheme != "" || linkURL.Host != "" {
+		return link // absolute URL, return as is
+	}
+
+	if strings.HasPrefix(link, "/") {
+		if strings.HasPrefix(link, base) && strings.Count(base, "/") >= 4 {
+			// a trick to tolerate that some users were using absolute paths (the old Gitea's behavior)
+			// if the link is likely "{base}/src/main" while "{base}" is something like "/owner/repo"
+			finalLink = link
+		} else {
+			// need to resolve the link relative to "{base}"
+			cur = ""
+		}
+	} // else: link is relative to "{base}/{cur}"
+
+	if finalLink == "" {
+		finalLink = strings.TrimSuffix(base, "/") + path.Join("/"+cur, "/"+linkURL.EscapedPath())
+		finalLink = strings.TrimSuffix(finalLink, "/")
+		if linkURL.RawQuery != "" {
+			finalLink += "?" + linkURL.RawQuery
+		}
+		if linkURL.Fragment != "" {
+			finalLink += "#" + linkURL.Fragment
+		}
+	}
+
+	if absolute {
+		finalLink = httplib.MakeAbsoluteURL(ctx, finalLink)
+	}
+	return finalLink
+}
+
+func (ctx *RenderContext) ResolveLinkRelative(base, cur, link string) string {
+	if strings.HasPrefix(link, "/:") {
+		setting.PanicInDevOrTesting("invalid link %q, forgot to cut?", link)
+	}
+	return resolveLinkRelative(ctx, base, cur, link, ctx.RenderOptions.UseAbsoluteLink)
+}
+
+func (ctx *RenderContext) ResolveLinkRoot(link string) string {
+	return ctx.ResolveLinkRelative(setting.AppSubURL+"/", "", link)
+}
+
+func ParseRenderedLink(s, preferLinkType string) (linkType, link string) {
+	if strings.HasPrefix(s, "/:") {
+		p := strings.IndexByte(s[1:], '/')
+		if p == -1 {
+			return s, ""
+		}
+		return s[:p+1], s[p+2:]
+	}
+	return preferLinkType, s
+}