More OG stuff

modules/codeimage/image/image.go

@@ -2,7 +2,6 @@ package image
 
 import (
 	"bytes"
-	"encoding/base64"
 	"image/color"
 	"strings"
 
@@ -10,7 +9,7 @@ import (
 	"github.com/jiro4989/textimg/v3/token"
 )
 
-func Draw(tokens token.Tokens) (string, error) {
+func Draw(tokens token.Tokens) ([]byte, error) {
 	foreground := color.RGBA{205, 214, 244, 255}
 	background := color.RGBA{30, 30, 46, 255}
 
@@ -19,7 +18,7 @@ func Draw(tokens token.Tokens) (string, error) {
 	bgCol := background
 	dc.SetColor(bgCol)
 	if err := dc.LoadFontFace("fonts/FiraCode-Regular.ttf", 14); err != nil {
-		return "", err
+		return nil, err
 	}
 	dc.Clear()
 	curX, curY := 0.0, 0.0
@@ -57,5 +56,5 @@ func Draw(tokens token.Tokens) (string, error) {
 	}
 	buffer := new(bytes.Buffer)
 	dc.EncodePNG(buffer)
-	return "data:image/png;base64," + base64.StdEncoding.EncodeToString(buffer.Bytes()), nil
+	return buffer.Bytes(), nil
 }

routers/web/repo/view.go

@@ -518,15 +518,11 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 				status = status.Or(statuses[i])
 			}
 
-			ansiContent, _, _ := highlight.AnsiFile(blob.Name(), language, buf)
-			log.Info("%s", ansiContent[0])
-			tks, _ := parser.Parse(strings.Join(ansiContent, ""))
-			imgStr, err := image.Draw(tks)
-			if err != nil {
-				log.Error("Drawing image failed: %v", err)
+			ogImg := ctx.Repo.Repository.HTMLURL() + "/src/og/" + ctx.Repo.BranchName
+			if len(ctx.Repo.TreePath) > 0 {
+				ogImg += "/" + util.PathEscapeSegments(ctx.Repo.TreePath)
 			}
-
-			ctx.Data["OgImage"] = imgStr
+			ctx.Data["OgImage"] = ogImg
 			ctx.Data["EscapeStatus"] = status
 			ctx.Data["FileContent"] = fileContent
 			ctx.Data["LineEscapeStatus"] = statuses
@@ -717,6 +713,55 @@ func checkCitationFile(ctx *context.Context, entry *git.TreeEntry) {
 	}
 }
 
+func OgImage(ctx *context.Context) {
+	entry, err := ctx.Repo.Commit.GetTreeEntryByPath(ctx.Repo.TreePath)
+	if err != nil {
+		log.Error("%v", err)
+		return
+	}
+	blob := entry.Blob()
+	buf, dataRc, _, err := getFileReader(ctx.Repo.Repository.ID, blob)
+	if err != nil {
+		ctx.ServerError("getFileReader", err)
+		return
+	}
+	defer dataRc.Close()
+
+	language := ""
+	indexFilename, worktree, deleteTemporaryFile, err := ctx.Repo.GitRepo.ReadTreeToTemporaryIndex(ctx.Repo.CommitID)
+	if err == nil {
+		defer deleteTemporaryFile()
+		filename2attribute2info, err := ctx.Repo.GitRepo.CheckAttribute(git.CheckAttributeOpts{
+			CachedOnly: true,
+			Attributes: []string{"linguist-language", "gitlab-language"},
+			Filenames:  []string{ctx.Repo.TreePath},
+			IndexFile:  indexFilename,
+			WorkTree:   worktree,
+		})
+		if err != nil {
+			log.Error("Unable to load attributes for %-v:%s. Error: %v", ctx.Repo.Repository, ctx.Repo.TreePath, err)
+		}
+
+		language = filename2attribute2info[ctx.Repo.TreePath]["linguist-language"]
+		if language == "" || language == "unspecified" {
+			language = filename2attribute2info[ctx.Repo.TreePath]["gitlab-language"]
+		}
+		if language == "unspecified" {
+			language = ""
+		}
+	}
+
+	ansiContent, _, _ := highlight.AnsiFile(blob.Name(), language, buf)
+	log.Info("%s", ansiContent[0])
+	tks, _ := parser.Parse(strings.Join(ansiContent, ""))
+	img, err := image.Draw(tks)
+	if err != nil {
+		log.Error("Drawing image failed: %v", err)
+	}
+
+	ctx.Write(img)
+}
+
 // Home render repository home page
 func Home(ctx *context.Context) {
 	if setting.Other.EnableFeed {

routers/web/web.go

@@ -1324,6 +1324,7 @@ func registerRoutes(m *web.Route) {
 			m.Get("/branch/*", context.RepoRefByType(context.RepoRefBranch), repo.Home)
 			m.Get("/tag/*", context.RepoRefByType(context.RepoRefTag), repo.Home)
 			m.Get("/commit/*", context.RepoRefByType(context.RepoRefCommit), repo.Home)
+			m.Get("/og/*", context.RepoRefByType(context.RepoRefBranch), repo.OgImage)
 			// "/*" route is deprecated, and kept for backward compatibility
 			m.Get("/*", context.RepoRefByType(context.RepoRefLegacy), repo.Home)
 		}, repo.SetEditorconfigIfExists)

templates/base/head.tmpl

@@ -38,14 +38,18 @@
 		<meta property="og:description" content="{{.ContextUser.Description}}">
 	{{end}}
 {{else if .PageIsViewCode }}
-	<meta property="og:title" content="{{.Repository.Name}}">
-	<meta property="og:url" content="{{.Repository.HTMLURL}}">
-	<meta name="twitter:card" content="summary_large_card">
-	{{if .Repository.Description}}
-		<meta property="og:description" content="{{.Repository.Description}}">
-	{{end}}
+  <meta name="twitter:image:src" content="{{.OgImage}}">
+	<meta name="twitter:site" content="@gitea">
+	<meta name="twitter:card" content="summary_large_image">
+	<meta name="twitter:title" content="{{.Repository.Name}}">
+	<meta name="twitter:description" content="{{.Repository.Description}}">
 	<meta property="og:image" content="{{.OgImage}}">
+	<meta property="og:image:alt" content="{{.Repository.Description}}">
+	<meta property="og:site_name" content="{{AppName}}">
 	<meta property="og:type" content="object">
+	<meta property="og:title" content="{{.Repository.Name}}">
+	<meta property="og:url" content="{{.Repository.HTMLURL}}">
+	<meta property="og:description" content="{{.Repository.Description}}">
 {{else if .Repository}}
 	{{if .Issue}}
 		<meta property="og:title" content="{{.Issue.Title}}">