Improve Git access error messages.

lib/api/internal.rb

@@ -24,10 +24,6 @@ module API
             User.find_by(id: params[:user_id])
           end
 
-        unless actor
-          return Gitlab::GitAccessStatus.new(false, 'No such user or key')
-        end
-
         project_path = params[:project]
         
         # Check for *.wiki repositories.
@@ -39,22 +35,14 @@ module API
 
         project = Project.find_with_namespace(project_path)
 
-        if project
-          access =
-            if wiki
-              Gitlab::GitAccessWiki.new(actor, project)
-            else
-              Gitlab::GitAccess.new(actor, project)
-            end
-
-          status = access.check(params[:action], params[:changes])
-        end
+        access =
+          if wiki
+            Gitlab::GitAccessWiki.new(actor, project)
+          else
+            Gitlab::GitAccess.new(actor, project)
+          end
 
-        if project && access.can_read_project?
-          status
-        else
-          Gitlab::GitAccessStatus.new(false, 'No such project')
-        end
+        access.check(params[:action], params[:changes])
       end
 
       #

lib/gitlab/git_access.rb

@@ -31,8 +31,7 @@ module Gitlab
     def can_push_to_branch?(ref)
       return false unless user
 
-      if project.protected_branch?(ref)  &&
-          !(project.developers_can_push_to_protected_branch?(ref) && project.team.developer?(user))
+      if project.protected_branch?(ref) && !project.developers_can_push_to_protected_branch?(ref)
         user.can?(:push_code_to_protected_branches, project)
       else
         user.can?(:push_code, project)
@@ -50,13 +49,25 @@ module Gitlab
     end
 
     def check(cmd, changes = nil)
+      unless actor
+        return build_status_object(false, "No user or key was provided.")
+      end
+
+      if user && !user_allowed?
+        return build_status_object(false, "Your account has been blocked.")
+      end
+
+      unless project && can_read_project?
+        return build_status_object(false, 'The project you were looking for could not be found.')
+      end
+
       case cmd
       when *DOWNLOAD_COMMANDS
         download_access_check
       when *PUSH_COMMANDS
         push_access_check(changes)
       else
-        build_status_object(false, "Wrong command")
+        build_status_object(false, "The command you're trying to execute is not allowed.")
       end
     end
 
@@ -64,7 +75,7 @@ module Gitlab
       if user
         user_download_access_check
       elsif deploy_key
-        deploy_key_download_access_check
+        build_status_object(true)
       else
         raise 'Wrong actor'
       end
@@ -74,39 +85,27 @@ module Gitlab
       if user
         user_push_access_check(changes)
       elsif deploy_key
-        build_status_object(false, "Deploy key not allowed to push")
+        build_status_object(false, "Deploy keys are not allowed to push code.")
       else
         raise 'Wrong actor'
       end
     end
 
     def user_download_access_check
-      if user && user_allowed? && user.can?(:download_code, project)
-        build_status_object(true)
-      else
-        build_status_object(false, "You don't have access")
+      unless user.can?(:download_code, project)
+        return build_status_object(false, "You are not allowed to download code from this project.")
       end
-    end
 
-    def deploy_key_download_access_check
-      if can_read_project?
-        build_status_object(true)
-      else
-        build_status_object(false, "Deploy key not allowed to access this project")
-      end
+      build_status_object(true)
     end
 
     def user_push_access_check(changes)
-      unless user && user_allowed?
-        return build_status_object(false, "You don't have access")
-      end
-
       if changes.blank?
         return build_status_object(true)
       end
 
       unless project.repository.exists?
-        return build_status_object(false, "Repository does not exist")
+        return build_status_object(false, "A repository for this project does not exist yet.")
       end
 
       changes = changes.lines if changes.kind_of?(String)
@@ -136,11 +135,23 @@ module Gitlab
           :push_code
         end
 
-      if user.can?(action, project)
-        build_status_object(true)
-      else
-        build_status_object(false, "You don't have permission")
+      unless user.can?(action, project)
+        return
+          case action
+          when :force_push_code_to_protected_branches
+            build_status_object(false, "You are not allowed to force push code to a protected branch on this project.")
+          when :remove_protected_branches
+            build_status_object(false, "You are not allowed to deleted protected branches from this project.")
+          when :push_code_to_protected_branches
+            build_status_object(false, "You are not allowed to push code to protected branches on this project.")
+          when :admin_project
+            build_status_object(false, "You are not allowed to change existing tags on this project.")
+          else # :push_code
+            build_status_object(false, "You are not allowed to push code to this project.")
+          end
       end
+
+      build_status_object(true)
     end
 
     def forced_push?(oldrev, newrev)

lib/gitlab/git_access_wiki.rb

@@ -4,7 +4,7 @@ module Gitlab
       if user.can?(:write_wiki, project)
         build_status_object(true)
       else
-        build_status_object(false, "You don't have access")
+        build_status_object(false, "You are not allowed to write to this project's wiki.")
       end
     end
   end