/
reviewer.go
171 lines (133 loc) · 3.81 KB
/
reviewer.go
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package main
import (
"encoding/base64"
"fmt"
"regexp"
"strings"
"github.com/blang/semver"
"github.com/google/go-github/github"
"github.com/iancoleman/strcase"
)
type review interface {
review() string
}
type reviewError struct {
Message string
}
func (r *reviewError) Error() string {
return r.Message
}
func (r *reviewError) review() string {
return r.Message
}
// Reviewer reviews bump up PRs
type Reviewer struct {
*GitHubClient
}
// Review reviews a bump up PR
func (r *Reviewer) Review(number int) error {
// Check if the PR changes only the version.rb file
if err := r.reviewFile(number); err != nil {
return r.handleReviewError(number, err)
}
// Check if the PR's version.rb follows the expected pattern
if err := r.reviewVersion(number); err != nil {
return r.handleReviewError(number, err)
}
// Approve the PR
if err := r.approvePullRequest(number); err != nil {
return err
}
return nil
}
func (r *Reviewer) reviewFile(number int) error {
files, err := r.ListPullRequestsFiles(number, nil)
if err != nil {
return err
}
if len(files) != 1 {
return &reviewError{Message: fmt.Sprintf("Pull Request #%d edited more than one file. bump-reviewer only allows to edit one file, which is `version.rb`.", number)}
}
filename := fmt.Sprintf("lib/%s/version.rb", r.Repo)
if *files[0].Filename != filename {
return &reviewError{Message: fmt.Sprintf("Pull Request #%d edited unexpected file, bump-reviewer only allows to edit %s.", number, filename)}
}
return nil
}
func (r *Reviewer) reviewVersion(number int) error {
release, err := r.GetLatestRelease()
if err != nil {
return err
}
tag := *release.TagName
opt := github.RepositoryContentGetOptions{Ref: fmt.Sprintf("pull/%d/head", number)}
fc, _, err := r.GetContent(fmt.Sprintf("lib/%s/version.rb", r.Repo), &opt)
if err != nil {
return err
}
content, err := decodeContent(fc)
if err != nil {
return err
}
// Trim the prefix "v" or "V"
trimmedTag := strings.TrimPrefix(tag, "v")
trimmedTag = strings.TrimPrefix(trimmedTag, "V")
if err := r.checkVersionRegex(trimmedTag, content); err != nil {
return err
}
return nil
}
func (r *Reviewer) handleReviewError(number int, err error) error {
if review, ok := err.(review); ok {
if err := r.postComment(number, review.review()); err != nil {
return err
}
}
return err
}
func (r *Reviewer) postComment(number int, comment string) error {
review := github.PullRequestReviewRequest{Event: github.String(ReviewComment), Body: github.String(comment)}
_, err := r.CreateReview(number, &review)
if err != nil {
return err
}
return nil
}
func (r *Reviewer) approvePullRequest(number int) error {
body := `LGTM
bump-reviewer checks the following two points.
- PR changes only version.rb
- PR increments patch version by one
`
approve := github.PullRequestReviewRequest{Event: github.String(ReviewApprove), Body: github.String(body)}
_, err := r.CreateReview(number, &approve)
if err != nil {
return err
}
return nil
}
func decodeContent(rc *github.RepositoryContent) (string, error) {
if *rc.Encoding != "base64" {
return "", fmt.Errorf("unexpected encoding: %s", *rc.Encoding)
}
decoded, err := base64.StdEncoding.DecodeString(*rc.Content)
if err != nil {
return "", err
}
return string(decoded), nil
}
func (r *Reviewer) checkVersionRegex(tag, content string) error {
appName := strcase.ToCamel(r.Repo)
v, err := semver.New(tag)
if err != nil {
return err
}
v.Patch = v.Patch + 1
newTag := v.String()
regStr := fmt.Sprintf(`\s*module\s+%s\s+VERSION\s*=\s*['"]%s['"](\.freeze)?\s+end\s*`, appName, newTag)
reg := regexp.MustCompile(regStr)
if !reg.Match([]byte(content)) {
return &reviewError{Message: fmt.Sprintf("version.rb does not match with the following regex: `%s`. bump-reviewer expects you increment patch version by one.", regStr)}
}
return nil
}