1 files changed, 98 insertions, 0 deletions
diff --git a/routers/common/markup.go b/routers/common/markup.go
new file mode 100644
index 0000000..2d5638e
--- /dev/null
+++ b/routers/common/markup.go
@@ -0,0 +1,98 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"code.gitea.io/gitea/modules/markup"
+	"code.gitea.io/gitea/modules/markup/markdown"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/context"
+
+	"mvdan.cc/xurls/v2"
+)
+
+// RenderMarkup renders markup text for the /markup and /markdown endpoints
+func RenderMarkup(ctx *context.Base, repo *context.Repository, mode, text, urlPrefix, filePath string, wiki bool) {
+	var markupType string
+	relativePath := ""
+
+	if len(text) == 0 {
+		_, _ = ctx.Write([]byte(""))
+		return
+	}
+
+	switch mode {
+	case "markdown":
+		// Raw markdown
+		if err := markdown.RenderRaw(&markup.RenderContext{
+			Ctx: ctx,
+			Links: markup.Links{
+				AbsolutePrefix: true,
+				Base:           urlPrefix,
+			},
+		}, strings.NewReader(text), ctx.Resp); err != nil {
+			ctx.Error(http.StatusInternalServerError, err.Error())
+		}
+		return
+	case "comment":
+		// Comment as markdown
+		markupType = markdown.MarkupName
+	case "gfm":
+		// Github Flavored Markdown as document
+		markupType = markdown.MarkupName
+	case "file":
+		// File as document based on file extension
+		markupType = ""
+		relativePath = filePath
+	default:
+		ctx.Error(http.StatusUnprocessableEntity, fmt.Sprintf("Unknown mode: %s", mode))
+		return
+	}
+
+	if !strings.HasPrefix(setting.AppSubURL+"/", urlPrefix) {
+		// check if urlPrefix is already set to a URL
+		linkRegex, _ := xurls.StrictMatchingScheme("https?://")
+		m := linkRegex.FindStringIndex(urlPrefix)
+		if m == nil {
+			urlPrefix = util.URLJoin(setting.AppURL, urlPrefix)
+		}
+	}
+
+	meta := map[string]string{}
+	if repo != nil && repo.Repository != nil {
+		if mode == "comment" {
+			meta = repo.Repository.ComposeMetas(ctx)
+		} else {
+			meta = repo.Repository.ComposeDocumentMetas(ctx)
+		}
+	}
+	if mode != "comment" {
+		meta["mode"] = "document"
+	}
+
+	if err := markup.Render(&markup.RenderContext{
+		Ctx: ctx,
+		Links: markup.Links{
+			AbsolutePrefix: true,
+			Base:           urlPrefix,
+		},
+		Metas:        meta,
+		IsWiki:       wiki,
+		Type:         markupType,
+		RelativePath: relativePath,
+	}, strings.NewReader(text), ctx.Resp); err != nil {
+		if markup.IsErrUnsupportedRenderExtension(err) {
+			ctx.Error(http.StatusUnprocessableEntity, err.Error())
+		} else {
+			ctx.Error(http.StatusInternalServerError, err.Error())
+		}
+		return
+	}
+}