ADD get a commit api

app/services/gitea/repository/commits/get_service.rb

@@ -1,16 +1,16 @@
 # Get a single commit from a repository
 class Gitea::Repository::Commits::GetService < Gitea::ClientService
-  attr_reader :token, :owner, :repo, :sha, :custom
+  attr_reader :token, :owner, :repo, :sha, :hash
 
   # sha: the commit hash
   # ex: Gitea::Repository::Commits::GetService.new(@repo.user.login, repo.identifier, params[:sha], current_user.gitea_token)
   # TODO custom参数用于判断调用哪个api
-  def initialize(owner, repo, sha, token, custom=false)
+  def initialize(owner, repo, sha, token, hash={})
     @token = token
     @owner = owner
     @sha   = sha
     @repo  = repo
-    @custom = custom
+    @hash = hash
   end
 
   def call
@@ -24,10 +24,10 @@ class Gitea::Repository::Commits::GetService < Gitea::ClientService
   end
 
   def url
-    if custom
+    if hash[:diff]
       # TODO
       # 平台自己编写的gitea接口，后续可能会通过提交pr的形式合并到gitea原有的接口上
-      "/repos/#{owner}/#{repo}/commits/diff/#{sha}".freeze
+      "/repos/#{owner}/#{repo}/commits/#{sha}/diff".freeze
     else
       "/repos/#{owner}/#{repo}/git/commits/#{sha}".freeze
     end