ADD some api

* api/v1/repos/{owner}/{repo}/pulls/{number}/commits
* api/v1/repos/{owner}/{repo}/pulls/{number}/files
* api/v1/repos/{owner}/{repo}/compare/{base}...{head}

app/services/gitea/pull_request/commits_service.rb

@@ -0,0 +1,40 @@
+# List commits on a pull request
+class Gitea::PullRequest::CommitsService < Gitea::ClientService
+  attr_reader :owner, :repo, :pull_number, :token
+
+  # GET /repos/{owner}/{repo}/pulls/{pull_number}/commits
+  # owner: 用户
+  # repo: 仓库名称/标识
+  # pull_number: pull request主键id
+  # eg:
+  # Gitea::PullRequest::FilesService.call('jasder', 'repo_identifier', 1)
+  def initialize(owner, repo, pull_number, token=nil)
+    @owner   = owner
+    @repo   = repo
+    @token  = token
+    @pull_number = pull_number
+  end
+
+  def call
+    response = get(url, params)
+    render_result(response)
+  end
+
+  private
+  def params
+    Hash.new.merge(token: owner)
+  end
+
+  def url
+    "/repos/#{owner}/#{repo}/pulls/#{pull_number}/commits".freeze
+  end
+
+  def render_result(response)
+    case response.status
+    when 200
+      JSON.parse(response.body)
+    else
+      nil
+    end
+  end
+end

app/services/gitea/pull_request/files_service.rb

@@ -0,0 +1,40 @@
+# List pull requests files
+class Gitea::PullRequest::FilesService < Gitea::ClientService
+  attr_reader :owner, :repo, :pull_number, :token
+
+  # GET /repos/{owner}/{repo}/pulls/{pull_number}/files
+  # owner: 用户
+  # repo: 仓库名称/标识
+  # pull_number: pull request主键id
+  # eg:
+  # Gitea::PullRequest::FilesService.call('jasder', 'repo_identifier', 1)
+  def initialize(owner, repo, pull_number, token=nil)
+    @owner  = owner
+    @repo   = repo
+    @token  = token
+    @pull_number = pull_number
+  end
+
+  def call
+    response = get(url, params)
+    render_result(response)
+  end
+
+  private
+  def params
+    Hash.new.merge(token: token)
+  end
+
+  def url
+    "/repos/#{owner}/#{repo}/pulls/#{pull_number}/files".freeze
+  end
+
+  def render_result(response)
+    case response.status
+    when 200
+      JSON.parse(response.body)
+    else
+      nil
+    end
+  end
+end