Fix handling of migration errors (#12928)

* Fix handling of migration errors

The migration type selection screen PR did not correctly handle errors
and any user input error on the migration page would simply redirect
back to the selection page. This meant that the error would simply be
lost and the user would be none the wiser as to what happened.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* make gen-swagger

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

3 files changed, 22 insertions, 15 deletions

diff --git a/modules/auth/repo_form.go b/modules/auth/repo_form.go
index f1130f372b..e8809136c9 100644
--- a/modules/auth/repo_form.go
+++ b/modules/auth/repo_form.go
@@ -11,6 +11,7 @@ import (
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/routers/utils"
 
 	"gitea.com/macaron/binding"
@@ -57,11 +58,11 @@ func (f *CreateRepoForm) Validate(ctx *macaron.Context, errs binding.Errors) bin
 // this is used to interact with web ui
 type MigrateRepoForm struct {
 	// required: true
-	CloneAddr    string `json:"clone_addr" binding:"Required"`
-	Service      int    `json:"service"`
-	AuthUsername string `json:"auth_username"`
-	AuthPassword string `json:"auth_password"`
-	AuthToken    string `json:"auth_token"`
+	CloneAddr    string                 `json:"clone_addr" binding:"Required"`
+	Service      structs.GitServiceType `json:"service"`
+	AuthUsername string                 `json:"auth_username"`
+	AuthPassword string                 `json:"auth_password"`
+	AuthToken    string                 `json:"auth_token"`
 	// required: true
 	UID int64 `json:"uid" binding:"Required"`
 	// required: true
diff --git a/routers/repo/migrate.go b/routers/repo/migrate.go
index 34060aabde..19dbfbab40 100644
--- a/routers/repo/migrate.go
+++ b/routers/repo/migrate.go
@@ -94,9 +94,11 @@ func handleMigrateError(ctx *context.Context, owner *models.User, err error, nam
 func MigratePost(ctx *context.Context, form auth.MigrateRepoForm) {
 	ctx.Data["Title"] = ctx.Tr("new_migrate")
 	// Plain git should be first
-	ctx.Data["service"] = form.Service
+	ctx.Data["service"] = structs.GitServiceType(form.Service)
 	ctx.Data["Services"] = append([]structs.GitServiceType{structs.PlainGitService}, structs.SupportedFullGitService...)
 
+	tpl := base.TplName("repo/migrate/" + structs.GitServiceType(form.Service).Name())
+
 	ctxUser := checkContextUser(ctx, form.UID)
 	if ctx.Written() {
 		return
@@ -104,7 +106,7 @@ func MigratePost(ctx *context.Context, form auth.MigrateRepoForm) {
 	ctx.Data["ContextUser"] = ctxUser
 
 	if ctx.HasError() {
-		ctx.HTML(200, tplMigrate)
+		ctx.HTML(200, tpl)
 		return
 	}
 
@@ -115,11 +117,11 @@ func MigratePost(ctx *context.Context, form auth.MigrateRepoForm) {
 			addrErr := err.(models.ErrInvalidCloneAddr)
 			switch {
 			case addrErr.IsURLError:
-				ctx.RenderWithErr(ctx.Tr("form.url_error"), tplMigrate, &form)
+				ctx.RenderWithErr(ctx.Tr("form.url_error"), tpl, &form)
 			case addrErr.IsPermissionDenied:
-				ctx.RenderWithErr(ctx.Tr("repo.migrate.permission_denied"), tplMigrate, &form)
+				ctx.RenderWithErr(ctx.Tr("repo.migrate.permission_denied"), tpl, &form)
 			case addrErr.IsInvalidPath:
-				ctx.RenderWithErr(ctx.Tr("repo.migrate.invalid_local_path"), tplMigrate, &form)
+				ctx.RenderWithErr(ctx.Tr("repo.migrate.invalid_local_path"), tpl, &form)
 			default:
 				ctx.ServerError("Unknown error", err)
 			}
@@ -159,7 +161,7 @@ func MigratePost(ctx *context.Context, form auth.MigrateRepoForm) {
 
 	err = models.CheckCreateRepository(ctx.User, ctxUser, opts.RepoName)
 	if err != nil {
-		handleMigrateError(ctx, ctxUser, err, "MigratePost", tplMigrate, &form)
+		handleMigrateError(ctx, ctxUser, err, "MigratePost", tpl, &form)
 		return
 	}
 
@@ -169,5 +171,5 @@ func MigratePost(ctx *context.Context, form auth.MigrateRepoForm) {
 		return
 	}
 
-	handleMigrateError(ctx, ctxUser, err, "MigratePost", tplMigrate, &form)
+	handleMigrateError(ctx, ctxUser, err, "MigratePost", tpl, &form)
 }
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 6792f7444b..6c0d8c1b32 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -13231,6 +13231,12 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "GitServiceType": {
+      "description": "GitServiceType represents a git service",
+      "type": "integer",
+      "format": "int64",
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "GitTreeResponse": {
       "description": "GitTreeResponse returns a git tree",
       "type": "object",
@@ -13658,9 +13664,7 @@
           "x-go-name": "RepoName"
         },
         "service": {
-          "type": "integer",
-          "format": "int64",
-          "x-go-name": "Service"
+          "$ref": "#/definitions/GitServiceType"
         },
         "uid": {
           "type": "integer",