[v7.0/forgejo] Render inline file permalinks

Backport: https://codeberg.org/forgejo/forgejo/pulls/2669

(cherry picked from commit 1d3240887c)
(cherry picked from commit 781a37fbe1)
(cherry picked from commit 8309f008c2)
(cherry picked from commit fae8d9f70d)
(cherry picked from commit 6721cba75b)
(cherry picked from commit 562e5cdf32)
(cherry picked from commit d789d33229)
(cherry picked from commit 8218e80bfc)
(cherry picked from commit 10bca456a9)
(cherry picked from commit db6f6281fc)
(cherry picked from commit ed8e8a792e)
(cherry picked from commit d6428f92ce)
(cherry picked from commit 069d87b80f)
(cherry picked from commit 2b6546adc9)
(cherry picked from commit 4c7cb0a5d2)
(cherry picked from commit 7e0014dd13)
(cherry picked from commit 16a8658878)
(cherry picked from commit 6e98bacbbd)

services/markup/processorhelper.go

@@ -5,10 +5,18 @@ package markup
 
 import (
 	"context"
+	"fmt"
 
+	"code.gitea.io/gitea/models/perm/access"
+	"code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
 	"code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/gitrepo"
+	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	gitea_context "code.gitea.io/gitea/services/context"
+	file_service "code.gitea.io/gitea/services/repository/files"
 )
 
 func ProcessorHelper() *markup.ProcessorHelper {
@@ -29,5 +37,51 @@ func ProcessorHelper() *markup.ProcessorHelper {
 			// when using gitea context (web context), use user's visibility and user's permission to check
 			return user.IsUserVisibleToViewer(giteaCtx, mentionedUser, giteaCtx.Doer)
 		},
+		GetRepoFileBlob: func(ctx context.Context, ownerName, repoName, commitSha, filePath string, language *string) (*git.Blob, error) {
+			repo, err := repo.GetRepositoryByOwnerAndName(ctx, ownerName, repoName)
+			if err != nil {
+				return nil, err
+			}
+
+			var user *user.User
+
+			giteaCtx, ok := ctx.(*gitea_context.Context)
+			if ok {
+				user = giteaCtx.Doer
+			}
+
+			perms, err := access.GetUserRepoPermission(ctx, repo, user)
+			if err != nil {
+				return nil, err
+			}
+			if !perms.CanRead(unit.TypeCode) {
+				return nil, fmt.Errorf("cannot access repository code")
+			}
+
+			gitRepo, err := gitrepo.OpenRepository(ctx, repo)
+			if err != nil {
+				return nil, err
+			}
+			defer gitRepo.Close()
+
+			commit, err := gitRepo.GetCommit(commitSha)
+			if err != nil {
+				return nil, err
+			}
+
+			if language != nil {
+				*language, err = file_service.TryGetContentLanguage(gitRepo, commitSha, filePath)
+				if err != nil {
+					log.Error("Unable to get file language for %-v:%s. Error: %v", repo, filePath, err)
+				}
+			}
+
+			blob, err := commit.GetBlobByPath(filePath)
+			if err != nil {
+				return nil, err
+			}
+
+			return blob, nil
+		},
 	}
 }