/
gitlab.go
711 lines (625 loc) · 23.2 KB
/
gitlab.go
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package gitlab
// # Infos / notes:
//
// ## Webhook calls
//
// Official API docs: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/project/integrations/webhooks.md
//
// ### Code Push
//
// A code push webhook is sent with the header: `X-Gitlab-Event: Push Hook`.
// Official docs: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/project/integrations/webhooks.md#push-events
//
// GitLab sends push webhooks for every branch separately. Even if you
// push to two different branches at the same time (git push --all) it'll
// trigger two webhook calls, one for each branch.
//
// Commits are grouped in the webhook - if you push more than one commit
// to a single branch it'll be included in a single webhook call, including
// all of the commits.
//
// The latest commit's hash is included as the "checkout_sha" parameter
// in the webhook. As we don't want to trigger build for every commit
// which is related to a single branch we will only handle the commit
// with the hash / id specified as the "checkout_sha".
//
// ### Tag Push
//
// GitLab sends webhooks for every tag separately. Even if you create 5 tags and push them with `git push --tags`
// GitLab will send out (properly) 5 separate webhooks, one for every tag (other services typically don't send
// these separately, or don't deliver all tags if you push more than ~3 tags in a single `git push --tags`).
//
// ### Merge request
// A merge request is sent with the header: `X-Gitlab-Event: Merge Request Hook`
// Official docs: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/project/integrations/webhooks.md#merge-request-events
//
import (
"encoding/json"
"errors"
"fmt"
"math"
"net/http"
"slices"
"strings"
"github.com/bitrise-io/bitrise-webhooks/bitriseapi"
hookCommon "github.com/bitrise-io/bitrise-webhooks/service/hook/common"
"github.com/bitrise-io/envman/envman"
"go.uber.org/zap"
)
// --------------------------
// --- Webhook Data Model ---
const (
tagPushEventID = "Tag Push Hook"
codePushEventID = "Push Hook"
mergeRequestEventID = "Merge Request Hook"
commentEventID = "Note Hook"
gitlabPublicVisibilityLevel = 20
// ProviderID ...
ProviderID = "gitlab"
commitMessagesEnvKey = "BITRISE_WEBHOOK_COMMIT_MESSAGES"
fallbackEnvBytesLimitInKB = 256
kbToB = 1024
)
// CommitModel ...
type CommitModel struct {
CommitHash string `json:"id"`
CommitMessage string `json:"message"`
AddedFiles []string `json:"added"`
ModifiedFiles []string `json:"modified"`
RemovedFiles []string `json:"removed"`
}
// CodePushEventModel ...
type CodePushEventModel struct {
ObjectKind string `json:"object_kind"`
Ref string `json:"ref"`
CheckoutSHA string `json:"checkout_sha"`
Commits []CommitModel `json:"commits"`
Repository RepositoryModel `json:"respository"`
UserUsername string `json:"user_username"`
}
// RepositoryModel ...
type RepositoryModel struct {
VisibilityLevel int `json:"visibility_level"`
GitSSHURL string `json:"git_ssh_url"`
GitHTTPURL string `json:"git_http_url"`
}
// TagPushEventModel ...
type TagPushEventModel struct {
ObjectKind string `json:"object_kind"`
Ref string `json:"ref"`
CheckoutSHA string `json:"checkout_sha"`
Repository RepositoryModel `json:"respository"`
UserUsername string `json:"user_username"`
}
// BranchInfoModel ...
type BranchInfoModel struct {
VisibilityLevel int `json:"visibility_level"`
GitSSHURL string `json:"git_ssh_url"`
GitHTTPURL string `json:"git_http_url"`
Namespace string `json:"namespace"`
}
// LastCommitInfoModel ...
type LastCommitInfoModel struct {
SHA string `json:"id"`
}
// LabelInfoModel ...
type LabelInfoModel struct {
ID int64 `json:"id"`
Title string `json:"title"`
}
// MergeRequestInfoModel ...
type MergeRequestInfoModel struct {
ID int `json:"iid"`
Title string `json:"title"`
Description string `json:"description"`
State string `json:"state"`
Action string `json:"action"`
MergeStatus string `json:"merge_status"`
MergeCommitSHA string `json:"merge_commit_sha"`
MergeError string `json:"merge_error"`
Oldrev string `json:"oldrev"`
Source BranchInfoModel `json:"source"`
SourceBranch string `json:"source_branch"`
Target BranchInfoModel `json:"target"`
TargetBranch string `json:"target_branch"`
LastCommit LastCommitInfoModel `json:"last_commit"`
Draft bool `json:"draft"`
Labels []LabelInfoModel `json:"labels"`
}
// UserModel ...
type UserModel struct {
Name string `json:"name"`
Username string `json:"username"`
}
// BoolChanges ...
type BoolChanges struct {
Previous bool `json:"previous"`
Current bool `json:"current"`
}
// Changes ...
type Changes struct {
Draft BoolChanges `json:"draft"`
Labels LabelChanges `json:"labels"`
}
// LabelChanges ...
type LabelChanges struct {
Previous []LabelInfoModel `json:"previous"`
Current []LabelInfoModel `json:"current"`
}
// MergeRequestEventModel ...
type MergeRequestEventModel struct {
ObjectKind string `json:"object_kind"`
ObjectAttributes MergeRequestInfoModel `json:"object_attributes"`
Labels []LabelInfoModel `json:"labels"`
User UserModel `json:"user"`
Changes Changes `json:"changes"`
}
// CommentInfoModel ...
type CommentInfoModel struct {
ID int `json:"id"`
Note string `json:"note"`
NoteableType string `json:"noteable_type"`
}
// MergeRequestCommentEventModel ...
type MergeRequestCommentEventModel struct {
ObjectKind string `json:"object_kind"`
ObjectAttributes CommentInfoModel `json:"object_attributes"`
MergeRequest MergeRequestInfoModel `json:"merge_request"`
User UserModel `json:"user"`
}
// ---------------------------------------
// --- Webhook Provider Implementation ---
// HookProvider ...
type HookProvider struct {
timeProvider hookCommon.TimeProvider
logger *zap.Logger
}
// NewHookProvider ...
func NewHookProvider(timeProvider hookCommon.TimeProvider, logger *zap.Logger) HookProvider {
return HookProvider{
timeProvider: timeProvider,
logger: logger,
}
}
// NewDefaultHookProvider ...
func NewDefaultHookProvider(logger *zap.Logger) HookProvider {
return NewHookProvider(hookCommon.NewDefaultTimeProvider(), logger)
}
func detectContentTypeAndEventID(header http.Header) (string, string, error) {
contentType := header.Get("Content-Type")
if contentType == "" {
return "", "", errors.New("No Content-Type Header found")
}
eventID := header.Get("X-Gitlab-Event")
if eventID == "" {
return "", "", errors.New("No X-Gitlab-Event Header found")
}
return contentType, eventID, nil
}
func isAcceptEventType(eventKey string) bool {
return slices.Contains([]string{tagPushEventID, codePushEventID, mergeRequestEventID, commentEventID}, eventKey)
}
func isAcceptMergeRequestState(prState string) bool {
return slices.Contains([]string{"opened", "reopened"}, prState)
}
func isAcceptMergeRequestAction(prAction string, prOldrev string, changes Changes) bool {
if prAction == "open" {
return true
}
if prAction == "update" {
// an "update" with "oldrev" present is a code change
if prOldrev != "" {
return true
}
// converted from draft to ready to review
if changes.Draft.Previous == true && changes.Draft.Current == false {
return true
}
// new labels were added
newLabels := changes.getNewLabels()
return len(newLabels) > 0
}
return false
}
func (changes Changes) getNewLabels() []string {
labelMap := make(map[int64]string)
for _, label := range changes.Labels.Current {
labelMap[label.ID] = label.Title
}
for _, label := range changes.Labels.Previous {
delete(labelMap, label.ID)
}
var newLabels []string
for _, label := range labelMap {
newLabels = append(newLabels, label)
}
slices.Sort(newLabels)
return newLabels
}
func (branchInfoModel BranchInfoModel) getRepositoryURL() string {
if branchInfoModel.VisibilityLevel == gitlabPublicVisibilityLevel {
return branchInfoModel.GitHTTPURL
}
return branchInfoModel.GitSSHURL
}
func (repository RepositoryModel) getRepositoryURL() string {
if repository.VisibilityLevel == gitlabPublicVisibilityLevel {
return repository.GitHTTPURL
}
return repository.GitSSHURL
}
func (hp HookProvider) transformCodePushEvent(codePushEvent CodePushEventModel) hookCommon.TransformResultModel {
if !strings.HasPrefix(codePushEvent.Ref, "refs/heads/") {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Ref (%s) is not a head ref", codePushEvent.Ref),
ShouldSkip: true,
}
}
branch := strings.TrimPrefix(codePushEvent.Ref, "refs/heads/")
// In case of squashed merge requests, Gitlab sends 3 event hooks: a Push, a Merge Request and another Push.
// The 2nd Push event does not contain commits and its checkout_sha is set to null.
//
// Related issue: https://bitrise.atlassian.net/browse/SSW-127
if codePushEvent.CheckoutSHA == "" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("The 'checkout_sha' field is not set - potential squashed merge request"),
ShouldSkip: true,
}
}
lastCommit := CommitModel{}
isLastCommitFound := false
for _, aCommit := range codePushEvent.Commits {
if aCommit.CommitHash == codePushEvent.CheckoutSHA {
isLastCommitFound = true
lastCommit = aCommit
break
}
}
if !isLastCommitFound {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("The commit specified by 'checkout_sha' was not included in the 'commits' array - no match found"),
}
}
var commitPaths []bitriseapi.CommitPaths
var commitMessages []string
for _, aCommit := range codePushEvent.Commits {
commitPaths = append(commitPaths, bitriseapi.CommitPaths{
Added: aCommit.AddedFiles,
Removed: aCommit.RemovedFiles,
Modified: aCommit.ModifiedFiles,
})
commitMessages = append(commitMessages, aCommit.CommitMessage)
}
maxSize := envVarSizeLimitInByte()
commitMessagesStr, err := hp.commitMessagesToString(commitMessages, maxSize)
if err != nil {
hp.logger.Warn("gitlab.HookProvider.transformCodePushEvent: failed to convert commit messages", zap.Error(err))
}
var environments []bitriseapi.EnvironmentItem
if len(commitMessagesStr) > 0 {
environments = []bitriseapi.EnvironmentItem{
{Name: commitMessagesEnvKey, Value: commitMessagesStr, IsExpand: false},
}
}
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
TriggerAPIParams: []bitriseapi.TriggerAPIParamsModel{
{
BuildParams: bitriseapi.BuildParamsModel{
CommitHash: lastCommit.CommitHash,
CommitMessage: lastCommit.CommitMessage,
CommitMessages: commitMessages,
PushCommitPaths: commitPaths,
Branch: branch,
BaseRepositoryURL: codePushEvent.Repository.getRepositoryURL(),
Environments: environments,
},
TriggeredBy: hookCommon.GenerateTriggeredBy(ProviderID, codePushEvent.UserUsername),
},
},
}
}
func envVarSizeLimitInByte() int {
config, err := envman.GetConfigs()
if err == nil {
return config.EnvBytesLimitInKB * kbToB
}
return fallbackEnvBytesLimitInKB * kbToB
}
func decreaseMaxMessageSizeByControlCharsSize(commitMessages []string, maxSize int) int {
controlCharsPerMessageSize := len([]byte("- \n"))
controlCharsSize := len(commitMessages) * controlCharsPerMessageSize
return maxSize - controlCharsSize
}
func (hp HookProvider) ensureCommitMessagesSize(commitMessages []string, maxSize int) ([]string, error) {
commitMessagesCount := len(commitMessages)
if commitMessagesCount > 20 {
// The count of push events commits, shouldn't be more than 20:
// https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html#push-events
// With this limit, 256KB max env var size, and 20 commits, every commit message has ~12KB (~12.000 chars) limitation.
// A higher number of commit messages might require a more sophisticated size limitation mechanism.
hp.logger.Warn(fmt.Sprintf("Expected 20 commits in the push event, got: %d, limiting commit messages count to 20", commitMessagesCount))
commitMessages = commitMessages[:20]
}
maxSize = decreaseMaxMessageSizeByControlCharsSize(commitMessages, maxSize)
if maxSize <= 0 {
return nil, fmt.Errorf("max messages size should be greater than 0, got: %d", maxSize)
}
maxMessageSize := int(math.Floor(float64(maxSize) / float64(len(commitMessages))))
trimmedMessageSuffix := []byte("...")
trimmedMessageSuffixSize := len(trimmedMessageSuffix)
if maxMessageSize-trimmedMessageSuffixSize <= 0 {
return nil, fmt.Errorf("max message size should be greater than %d, got: %d", trimmedMessageSuffixSize, maxMessageSize)
}
for idx, message := range commitMessages {
messageBytes := []byte(message)
messageSize := len(messageBytes)
if messageSize > maxMessageSize {
trimmedMessageBytes := messageBytes[:maxMessageSize-trimmedMessageSuffixSize]
commitMessages[idx] = string(append(trimmedMessageBytes, trimmedMessageSuffix...))
}
}
return commitMessages, nil
}
func (hp HookProvider) commitMessagesToString(commitMessages []string, maxSize int) (string, error) {
var err error
commitMessages, err = hp.ensureCommitMessagesSize(commitMessages, maxSize)
if err != nil {
return "", err
}
commitMessagesStr := ""
for _, commitMessage := range commitMessages {
commitMessagesStr += fmt.Sprintf("- %s\n", commitMessage)
}
return commitMessagesStr, nil
}
func transformTagPushEvent(tagPushEvent TagPushEventModel) hookCommon.TransformResultModel {
if tagPushEvent.ObjectKind != "tag_push" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Not a Tag Push object: %s", tagPushEvent.ObjectKind),
}
}
if !strings.HasPrefix(tagPushEvent.Ref, "refs/tags/") {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Ref (%s) is not a tags ref", tagPushEvent.Ref),
}
}
tag := strings.TrimPrefix(tagPushEvent.Ref, "refs/tags/")
if len(tagPushEvent.CheckoutSHA) < 1 {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("This is a Tag Deleted event, no build is required"),
ShouldSkip: true,
}
}
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
TriggerAPIParams: []bitriseapi.TriggerAPIParamsModel{
{
BuildParams: bitriseapi.BuildParamsModel{
Tag: tag,
CommitHash: tagPushEvent.CheckoutSHA,
BaseRepositoryURL: tagPushEvent.Repository.getRepositoryURL(),
},
TriggeredBy: hookCommon.GenerateTriggeredBy(ProviderID, tagPushEvent.UserUsername),
},
},
}
}
func transformMergeRequestEvent(event MergeRequestEventModel) hookCommon.TransformResultModel {
if event.ObjectKind != "merge_request" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("Not a Merge Request object"),
ShouldSkip: true,
}
}
mergeRequest := event.ObjectAttributes
if !isAcceptMergeRequestAction(mergeRequest.Action, mergeRequest.Oldrev, event.Changes) {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Merge Request action doesn't require a build: %s", mergeRequest.Action),
ShouldSkip: true,
}
}
newLabels := event.Changes.getNewLabels()
readyState := mergeRequestReadyState(event)
user := event.User
return transformMergeRequest(mergeRequest, user, readyState, newLabels, "")
}
func transformMergeRequestCommentEvent(event MergeRequestCommentEventModel) hookCommon.TransformResultModel {
if event.ObjectKind != "note" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("Not a Note object"),
ShouldSkip: true,
}
}
if event.ObjectAttributes.NoteableType != "MergeRequest" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("Not a Merge Request note"),
ShouldSkip: true,
}
}
comment := event.ObjectAttributes
mergeRequest := event.MergeRequest
user := event.User
var newLabels []string
var readyState bitriseapi.PullRequestReadyState
if mergeRequest.Draft {
readyState = bitriseapi.PullRequestReadyStateDraft
} else {
readyState = bitriseapi.PullRequestReadyStateReadyForReview
}
return transformMergeRequest(mergeRequest, user, readyState, newLabels, comment.Note)
}
func transformMergeRequest(
mergeRequest MergeRequestInfoModel,
user UserModel,
readyState bitriseapi.PullRequestReadyState,
newLabels []string,
comment string,
) hookCommon.TransformResultModel {
if mergeRequest.State == "" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("No Merge Request state specified"),
ShouldSkip: true,
}
}
if mergeRequest.MergeCommitSHA != "" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("Merge Request already merged"),
ShouldSkip: true,
}
}
if !isAcceptMergeRequestState(mergeRequest.State) {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Merge Request state doesn't require a build: %s", mergeRequest.State),
ShouldSkip: true,
}
}
if mergeRequest.MergeStatus == "cannot_be_merged" || mergeRequest.MergeError != "" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: errors.New("Merge Request is not mergeable"),
ShouldSkip: true,
}
}
commitMsg := mergeRequest.Title
if mergeRequest.Description != "" {
commitMsg = fmt.Sprintf("%s\n\n%s", commitMsg, mergeRequest.Description)
}
var mergeRef string
mergeStatus := mergeRequest.MergeStatus
if mergeStatus != "preparing" && mergeStatus != "unchecked" {
mergeRef = fmt.Sprintf("merge-requests/%d/merge", mergeRequest.ID)
}
var labels []string
for _, label := range mergeRequest.Labels {
labels = append(labels, label.Title)
}
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
TriggerAPIParams: []bitriseapi.TriggerAPIParamsModel{
{
BuildParams: bitriseapi.BuildParamsModel{
CommitMessage: commitMsg,
CommitHash: mergeRequest.LastCommit.SHA,
Branch: mergeRequest.SourceBranch,
BranchRepoOwner: mergeRequest.Source.Namespace,
BranchDest: mergeRequest.TargetBranch,
BranchDestRepoOwner: mergeRequest.Target.Namespace,
PullRequestID: &mergeRequest.ID,
BaseRepositoryURL: mergeRequest.Target.getRepositoryURL(),
HeadRepositoryURL: mergeRequest.Source.getRepositoryURL(),
PullRequestRepositoryURL: mergeRequest.Source.getRepositoryURL(),
PullRequestAuthor: user.Name,
PullRequestMergeBranch: mergeRef,
PullRequestHeadBranch: fmt.Sprintf("merge-requests/%d/head", mergeRequest.ID),
PullRequestReadyState: readyState,
PullRequestLabelsAdded: newLabels,
PullRequestLabels: labels,
PullRequestComment: comment,
},
TriggeredBy: hookCommon.GenerateTriggeredBy(ProviderID, user.Username),
},
},
SkippedByPrDescription: !hookCommon.IsSkipBuildByCommitMessage(mergeRequest.Title) &&
hookCommon.IsSkipBuildByCommitMessage(mergeRequest.Description),
}
}
func mergeRequestReadyState(mergeRequest MergeRequestEventModel) bitriseapi.PullRequestReadyState {
// converted from draft to ready to review
if mergeRequest.Changes.Draft.Previous == true && mergeRequest.Changes.Draft.Current == false {
return bitriseapi.PullRequestReadyStateConvertedToReadyForReview
}
if mergeRequest.ObjectAttributes.Draft {
return bitriseapi.PullRequestReadyStateDraft
}
return bitriseapi.PullRequestReadyStateReadyForReview
}
// TransformRequest ...
func (hp HookProvider) TransformRequest(r *http.Request) hookCommon.TransformResultModel {
contentType, eventID, err := detectContentTypeAndEventID(r.Header)
if err != nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Issue with Headers: %s", err),
}
}
if contentType != "application/json" {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Content-Type is not supported: %s", contentType),
}
}
if !isAcceptEventType(eventID) {
// Unsupported Event
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Unsupported Webhook event: %s", eventID),
}
}
if r.Body == nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Failed to read content of request body: no or empty request body"),
}
}
if eventID == codePushEventID {
// code push
var codePushEvent CodePushEventModel
if contentType == "application/json" {
if err := json.NewDecoder(r.Body).Decode(&codePushEvent); err != nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Failed to parse request body: %s", err),
}
}
}
return hp.transformCodePushEvent(codePushEvent)
} else if eventID == tagPushEventID {
// tag push
var tagPushEvent TagPushEventModel
if contentType == "application/json" {
if err := json.NewDecoder(r.Body).Decode(&tagPushEvent); err != nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Failed to parse request body: %s", err),
}
}
}
return transformTagPushEvent(tagPushEvent)
} else if eventID == mergeRequestEventID {
var mergeRequestEvent MergeRequestEventModel
if err := json.NewDecoder(r.Body).Decode(&mergeRequestEvent); err != nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Failed to parse request body as JSON: %s", err),
}
}
return transformMergeRequestEvent(mergeRequestEvent)
} else if eventID == commentEventID {
var commentEvent MergeRequestCommentEventModel
if err := json.NewDecoder(r.Body).Decode(&commentEvent); err != nil {
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Failed to parse request body as JSON: %s", err),
}
}
return transformMergeRequestCommentEvent(commentEvent)
}
return hookCommon.TransformResultModel{
DontWaitForTriggerResponse: true,
Error: fmt.Errorf("Unsupported GitLab event type: %s", eventID),
}
}