Decouple the different contexts from each other (#24786)

Replace #16455

Close #21803

Mixing different Gitea contexts together causes some problems:

1. Unable to respond proper content when error occurs, eg: Web should
respond HTML while API should respond JSON
2. Unclear dependency, eg: it's unclear when Context is used in
APIContext, which fields should be initialized, which methods are
necessary.


To make things clear, this PR introduces a Base context, it only
provides basic Req/Resp/Data features.

This PR mainly moves code. There are still many legacy problems and
TODOs in code, leave unrelated changes to future PRs.

6 files changed, 11 insertions, 19 deletions

diff --git a/routers/web/misc/markup.go b/routers/web/misc/markup.go
index 1690378945..c91da9a7f1 100644
--- a/routers/web/misc/markup.go
+++ b/routers/web/misc/markup.go
@@ -5,8 +5,6 @@
 package misc
 
 import (
-	"net/http"
-
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/web"
@@ -16,11 +14,5 @@ import (
 // Markup render markup document to HTML
 func Markup(ctx *context.Context) {
 	form := web.GetForm(ctx).(*api.MarkupOption)
-
-	if ctx.HasAPIError() {
-		ctx.Error(http.StatusUnprocessableEntity, "", ctx.GetErrMsg())
-		return
-	}
-
-	common.RenderMarkup(ctx, form.Mode, form.Text, form.Context, form.FilePath, form.Wiki)
+	common.RenderMarkup(ctx.Base, ctx.Repo, form.Mode, form.Text, form.Context, form.FilePath, form.Wiki)
 }
diff --git a/routers/web/repo/attachment.go b/routers/web/repo/attachment.go
index c46ec29841..fb95e63ecf 100644
--- a/routers/web/repo/attachment.go
+++ b/routers/web/repo/attachment.go
@@ -153,7 +153,7 @@ func ServeAttachment(ctx *context.Context, uuid string) {
 	}
 	defer fr.Close()
 
-	common.ServeContentByReadSeeker(ctx, attach.Name, attach.CreatedUnix.AsTime(), fr)
+	common.ServeContentByReadSeeker(ctx.Base, attach.Name, attach.CreatedUnix.AsTime(), fr)
 }
 
 // GetAttachment serve attachments
diff --git a/routers/web/repo/download.go b/routers/web/repo/download.go
index 1c87f9bed7..a498180f35 100644
--- a/routers/web/repo/download.go
+++ b/routers/web/repo/download.go
@@ -47,7 +47,7 @@ func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob, lastModified time.Time
 				log.Error("ServeBlobOrLFS: Close: %v", err)
 			}
 			closed = true
-			return common.ServeBlob(ctx, blob, lastModified)
+			return common.ServeBlob(ctx.Base, ctx.Repo.TreePath, blob, lastModified)
 		}
 		if httpcache.HandleGenericETagCache(ctx.Req, ctx.Resp, `"`+pointer.Oid+`"`) {
 			return nil
@@ -71,7 +71,7 @@ func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob, lastModified time.Time
 				log.Error("ServeBlobOrLFS: Close: %v", err)
 			}
 		}()
-		common.ServeContentByReadSeeker(ctx, ctx.Repo.TreePath, lastModified, lfsDataRc)
+		common.ServeContentByReadSeeker(ctx.Base, ctx.Repo.TreePath, lastModified, lfsDataRc)
 		return nil
 	}
 	if err = dataRc.Close(); err != nil {
@@ -79,7 +79,7 @@ func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob, lastModified time.Time
 	}
 	closed = true
 
-	return common.ServeBlob(ctx, blob, lastModified)
+	return common.ServeBlob(ctx.Base, ctx.Repo.TreePath, blob, lastModified)
 }
 
 func getBlobForEntry(ctx *context.Context) (blob *git.Blob, lastModified time.Time) {
@@ -120,7 +120,7 @@ func SingleDownload(ctx *context.Context) {
 		return
 	}
 
-	if err := common.ServeBlob(ctx, blob, lastModified); err != nil {
+	if err := common.ServeBlob(ctx.Base, ctx.Repo.TreePath, blob, lastModified); err != nil {
 		ctx.ServerError("ServeBlob", err)
 	}
 }
@@ -148,7 +148,7 @@ func DownloadByID(ctx *context.Context) {
 		}
 		return
 	}
-	if err = common.ServeBlob(ctx, blob, time.Time{}); err != nil {
+	if err = common.ServeBlob(ctx.Base, ctx.Repo.TreePath, blob, time.Time{}); err != nil {
 		ctx.ServerError("ServeBlob", err)
 	}
 }
diff --git a/routers/web/repo/http.go b/routers/web/repo/http.go
index 4e45a9b6e2..b6ebd25915 100644
--- a/routers/web/repo/http.go
+++ b/routers/web/repo/http.go
@@ -109,7 +109,7 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
 	if err != nil {
 		if repo_model.IsErrRepoNotExist(err) {
 			if redirectRepoID, err := repo_model.LookupRedirect(owner.ID, reponame); err == nil {
-				context.RedirectToRepo(ctx, redirectRepoID)
+				context.RedirectToRepo(ctx.Base, redirectRepoID)
 				return
 			}
 			repoExist = false
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index 88d2a97a7a..7a0dc9940b 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -2344,7 +2344,7 @@ func UpdatePullReviewRequest(ctx *context.Context) {
 
 // SearchIssues searches for issues across the repositories that the user has access to
 func SearchIssues(ctx *context.Context) {
-	before, since, err := context.GetQueryBeforeSince(ctx)
+	before, since, err := context.GetQueryBeforeSince(ctx.Base)
 	if err != nil {
 		ctx.Error(http.StatusUnprocessableEntity, err.Error())
 		return
@@ -2545,7 +2545,7 @@ func getUserIDForFilter(ctx *context.Context, queryName string) int64 {
 
 // ListIssues list the issues of a repository
 func ListIssues(ctx *context.Context) {
-	before, since, err := context.GetQueryBeforeSince(ctx)
+	before, since, err := context.GetQueryBeforeSince(ctx.Base)
 	if err != nil {
 		ctx.Error(http.StatusUnprocessableEntity, err.Error())
 		return
diff --git a/routers/web/repo/wiki.go b/routers/web/repo/wiki.go
index a335c114be..115418887d 100644
--- a/routers/web/repo/wiki.go
+++ b/routers/web/repo/wiki.go
@@ -671,7 +671,7 @@ func WikiRaw(ctx *context.Context) {
 	}
 
 	if entry != nil {
-		if err = common.ServeBlob(ctx, entry.Blob(), time.Time{}); err != nil {
+		if err = common.ServeBlob(ctx.Base, ctx.Repo.TreePath, entry.Blob(), time.Time{}); err != nil {
 			ctx.ServerError("ServeBlob", err)
 		}
 		return