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.

services/forms/repo_form.go

@@ -54,7 +54,7 @@ type CreateRepoForm struct {
 
 // Validate validates the fields
 func (f *CreateRepoForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -87,7 +87,7 @@ type MigrateRepoForm struct {
 
 // Validate validates the fields
 func (f *MigrateRepoForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -176,7 +176,7 @@ type RepoSettingForm struct {
 
 // Validate validates the fields
 func (f *RepoSettingForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -215,7 +215,7 @@ type ProtectBranchForm struct {
 
 // Validate validates the fields
 func (f *ProtectBranchForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -280,7 +280,7 @@ type NewWebhookForm struct {
 
 // Validate validates the fields
 func (f *NewWebhookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -294,7 +294,7 @@ type NewGogshookForm struct {
 
 // Validate validates the fields
 func (f *NewGogshookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -310,7 +310,7 @@ type NewSlackHookForm struct {
 
 // Validate validates the fields
 func (f *NewSlackHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	if !webhook.IsValidSlackChannel(strings.TrimSpace(f.Channel)) {
 		errs = append(errs, binding.Error{
 			FieldNames:     []string{"Channel"},
@@ -331,7 +331,7 @@ type NewDiscordHookForm struct {
 
 // Validate validates the fields
 func (f *NewDiscordHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -343,7 +343,7 @@ type NewDingtalkHookForm struct {
 
 // Validate validates the fields
 func (f *NewDingtalkHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -356,7 +356,7 @@ type NewTelegramHookForm struct {
 
 // Validate validates the fields
 func (f *NewTelegramHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -370,7 +370,7 @@ type NewMatrixHookForm struct {
 
 // Validate validates the fields
 func (f *NewMatrixHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -382,7 +382,7 @@ type NewMSTeamsHookForm struct {
 
 // Validate validates the fields
 func (f *NewMSTeamsHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -394,7 +394,7 @@ type NewFeishuHookForm struct {
 
 // Validate validates the fields
 func (f *NewFeishuHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -406,7 +406,7 @@ type NewWechatWorkHookForm struct {
 
 // Validate validates the fields
 func (f *NewWechatWorkHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -420,7 +420,7 @@ type NewPackagistHookForm struct {
 
 // Validate validates the fields
 func (f *NewPackagistHookForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -447,7 +447,7 @@ type CreateIssueForm struct {
 
 // Validate validates the fields
 func (f *CreateIssueForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -460,7 +460,7 @@ type CreateCommentForm struct {
 
 // Validate validates the fields
 func (f *CreateCommentForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -471,7 +471,7 @@ type ReactionForm struct {
 
 // Validate validates the fields
 func (f *ReactionForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -482,7 +482,7 @@ type IssueLockForm struct {
 
 // Validate validates the fields
 func (i *IssueLockForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, i, ctx.Locale)
 }
 
@@ -550,7 +550,7 @@ type CreateMilestoneForm struct {
 
 // Validate validates the fields
 func (f *CreateMilestoneForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -572,7 +572,7 @@ type CreateLabelForm struct {
 
 // Validate validates the fields
 func (f *CreateLabelForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -583,7 +583,7 @@ type InitializeLabelsForm struct {
 
 // Validate validates the fields
 func (f *InitializeLabelsForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -611,7 +611,7 @@ type MergePullRequestForm struct {
 
 // Validate validates the fields
 func (f *MergePullRequestForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -629,7 +629,7 @@ type CodeCommentForm struct {
 
 // Validate validates the fields
 func (f *CodeCommentForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -643,7 +643,7 @@ type SubmitReviewForm struct {
 
 // Validate validates the fields
 func (f *SubmitReviewForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -704,7 +704,7 @@ type NewReleaseForm struct {
 
 // Validate validates the fields
 func (f *NewReleaseForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -719,7 +719,7 @@ type EditReleaseForm struct {
 
 // Validate validates the fields
 func (f *EditReleaseForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -740,7 +740,7 @@ type NewWikiForm struct {
 // Validate validates the fields
 // FIXME: use code generation to generate this method.
 func (f *NewWikiForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -765,7 +765,7 @@ type EditRepoFileForm struct {
 
 // Validate validates the fields
 func (f *EditRepoFileForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -776,7 +776,7 @@ type EditPreviewDiffForm struct {
 
 // Validate validates the fields
 func (f *EditPreviewDiffForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -800,7 +800,7 @@ type CherryPickForm struct {
 
 // Validate validates the fields
 func (f *CherryPickForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -825,7 +825,7 @@ type UploadRepoFileForm struct {
 
 // Validate validates the fields
 func (f *UploadRepoFileForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -836,7 +836,7 @@ type RemoveUploadFileForm struct {
 
 // Validate validates the fields
 func (f *RemoveUploadFileForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -859,7 +859,7 @@ type DeleteRepoFileForm struct {
 
 // Validate validates the fields
 func (f *DeleteRepoFileForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -878,7 +878,7 @@ type AddTimeManuallyForm struct {
 
 // Validate validates the fields
 func (f *AddTimeManuallyForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
@@ -894,6 +894,6 @@ type DeadlineForm struct {
 
 // Validate validates the fields
 func (f *DeadlineForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
-	ctx := context.GetContext(req)
+	ctx := context.GetValidateContext(req)
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }