Move issues related files into models/issues (#19931)

* Move access and repo permission to models/perm/access

* fix test

* fix git test

* Move functions sequence

* Some improvements per @KN4CK3R and @delvh

* Move issues related code to models/issues

* Move some issues related sub package

* Merge

* Fix test

* Fix test

* Fix test

* Fix test

* Rename some files

1 files changed, 838 insertions, 0 deletions

diff --git a/models/issues/pull.go b/models/issues/pull.go
new file mode 100644
index 0000000000..f2ca19b03e
--- /dev/null
+++ b/models/issues/pull.go
@@ -0,0 +1,838 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package issues
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	git_model "code.gitea.io/gitea/models/git"
+	pull_model "code.gitea.io/gitea/models/pull"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+)
+
+// ErrPullRequestNotExist represents a "PullRequestNotExist" kind of error.
+type ErrPullRequestNotExist struct {
+	ID         int64
+	IssueID    int64
+	HeadRepoID int64
+	BaseRepoID int64
+	HeadBranch string
+	BaseBranch string
+}
+
+// IsErrPullRequestNotExist checks if an error is a ErrPullRequestNotExist.
+func IsErrPullRequestNotExist(err error) bool {
+	_, ok := err.(ErrPullRequestNotExist)
+	return ok
+}
+
+func (err ErrPullRequestNotExist) Error() string {
+	return fmt.Sprintf("pull request does not exist [id: %d, issue_id: %d, head_repo_id: %d, base_repo_id: %d, head_branch: %s, base_branch: %s]",
+		err.ID, err.IssueID, err.HeadRepoID, err.BaseRepoID, err.HeadBranch, err.BaseBranch)
+}
+
+// ErrPullRequestAlreadyExists represents a "PullRequestAlreadyExists"-error
+type ErrPullRequestAlreadyExists struct {
+	ID         int64
+	IssueID    int64
+	HeadRepoID int64
+	BaseRepoID int64
+	HeadBranch string
+	BaseBranch string
+}
+
+// IsErrPullRequestAlreadyExists checks if an error is a ErrPullRequestAlreadyExists.
+func IsErrPullRequestAlreadyExists(err error) bool {
+	_, ok := err.(ErrPullRequestAlreadyExists)
+	return ok
+}
+
+// Error does pretty-printing :D
+func (err ErrPullRequestAlreadyExists) Error() string {
+	return fmt.Sprintf("pull request already exists for these targets [id: %d, issue_id: %d, head_repo_id: %d, base_repo_id: %d, head_branch: %s, base_branch: %s]",
+		err.ID, err.IssueID, err.HeadRepoID, err.BaseRepoID, err.HeadBranch, err.BaseBranch)
+}
+
+// ErrPullRequestHeadRepoMissing represents a "ErrPullRequestHeadRepoMissing" error
+type ErrPullRequestHeadRepoMissing struct {
+	ID         int64
+	HeadRepoID int64
+}
+
+// IsErrErrPullRequestHeadRepoMissing checks if an error is a ErrPullRequestHeadRepoMissing.
+func IsErrErrPullRequestHeadRepoMissing(err error) bool {
+	_, ok := err.(ErrPullRequestHeadRepoMissing)
+	return ok
+}
+
+// Error does pretty-printing :D
+func (err ErrPullRequestHeadRepoMissing) Error() string {
+	return fmt.Sprintf("pull request head repo missing [id: %d, head_repo_id: %d]",
+		err.ID, err.HeadRepoID)
+}
+
+// ErrPullWasClosed is used close a closed pull request
+type ErrPullWasClosed struct {
+	ID    int64
+	Index int64
+}
+
+// IsErrPullWasClosed checks if an error is a ErrErrPullWasClosed.
+func IsErrPullWasClosed(err error) bool {
+	_, ok := err.(ErrPullWasClosed)
+	return ok
+}
+
+func (err ErrPullWasClosed) Error() string {
+	return fmt.Sprintf("Pull request [%d] %d was already closed", err.ID, err.Index)
+}
+
+// PullRequestType defines pull request type
+type PullRequestType int
+
+// Enumerate all the pull request types
+const (
+	PullRequestGitea PullRequestType = iota
+	PullRequestGit
+)
+
+// PullRequestStatus defines pull request status
+type PullRequestStatus int
+
+// Enumerate all the pull request status
+const (
+	PullRequestStatusConflict PullRequestStatus = iota
+	PullRequestStatusChecking
+	PullRequestStatusMergeable
+	PullRequestStatusManuallyMerged
+	PullRequestStatusError
+	PullRequestStatusEmpty
+)
+
+// PullRequestFlow the flow of pull request
+type PullRequestFlow int
+
+const (
+	// PullRequestFlowGithub github flow from head branch to base branch
+	PullRequestFlowGithub PullRequestFlow = iota
+	// PullRequestFlowAGit Agit flow pull request, head branch is not exist
+	PullRequestFlowAGit
+)
+
+// PullRequest represents relation between pull request and repositories.
+type PullRequest struct {
+	ID              int64 `xorm:"pk autoincr"`
+	Type            PullRequestType
+	Status          PullRequestStatus
+	ConflictedFiles []string `xorm:"TEXT JSON"`
+	CommitsAhead    int
+	CommitsBehind   int
+
+	ChangedProtectedFiles []string `xorm:"TEXT JSON"`
+
+	IssueID int64  `xorm:"INDEX"`
+	Issue   *Issue `xorm:"-"`
+	Index   int64
+
+	HeadRepoID          int64                  `xorm:"INDEX"`
+	HeadRepo            *repo_model.Repository `xorm:"-"`
+	BaseRepoID          int64                  `xorm:"INDEX"`
+	BaseRepo            *repo_model.Repository `xorm:"-"`
+	HeadBranch          string
+	HeadCommitID        string `xorm:"-"`
+	BaseBranch          string
+	ProtectedBranch     *git_model.ProtectedBranch `xorm:"-"`
+	MergeBase           string                     `xorm:"VARCHAR(40)"`
+	AllowMaintainerEdit bool                       `xorm:"NOT NULL DEFAULT false"`
+
+	HasMerged      bool               `xorm:"INDEX"`
+	MergedCommitID string             `xorm:"VARCHAR(40)"`
+	MergerID       int64              `xorm:"INDEX"`
+	Merger         *user_model.User   `xorm:"-"`
+	MergedUnix     timeutil.TimeStamp `xorm:"updated INDEX"`
+
+	isHeadRepoLoaded bool `xorm:"-"`
+
+	Flow PullRequestFlow `xorm:"NOT NULL DEFAULT 0"`
+}
+
+func init() {
+	db.RegisterModel(new(PullRequest))
+}
+
+// DeletePullsByBaseRepoID deletes all pull requests by the base repository ID
+func DeletePullsByBaseRepoID(ctx context.Context, repoID int64) error {
+	deleteCond := builder.Select("id").From("pull_request").Where(builder.Eq{"pull_request.base_repo_id": repoID})
+
+	// Delete scheduled auto merges
+	if _, err := db.GetEngine(ctx).In("pull_id", deleteCond).
+		Delete(&pull_model.AutoMerge{}); err != nil {
+		return err
+	}
+
+	// Delete review states
+	if _, err := db.GetEngine(ctx).In("pull_id", deleteCond).
+		Delete(&pull_model.ReviewState{}); err != nil {
+		return err
+	}
+
+	_, err := db.DeleteByBean(ctx, &PullRequest{BaseRepoID: repoID})
+	return err
+}
+
+// MustHeadUserName returns the HeadRepo's username if failed return blank
+func (pr *PullRequest) MustHeadUserName() string {
+	if err := pr.LoadHeadRepo(); err != nil {
+		if !repo_model.IsErrRepoNotExist(err) {
+			log.Error("LoadHeadRepo: %v", err)
+		} else {
+			log.Warn("LoadHeadRepo %d but repository does not exist: %v", pr.HeadRepoID, err)
+		}
+		return ""
+	}
+	if pr.HeadRepo == nil {
+		return ""
+	}
+	return pr.HeadRepo.OwnerName
+}
+
+// Note: don't try to get Issue because will end up recursive querying.
+func (pr *PullRequest) loadAttributes(ctx context.Context) (err error) {
+	if pr.HasMerged && pr.Merger == nil {
+		pr.Merger, err = user_model.GetUserByIDCtx(ctx, pr.MergerID)
+		if user_model.IsErrUserNotExist(err) {
+			pr.MergerID = -1
+			pr.Merger = user_model.NewGhostUser()
+		} else if err != nil {
+			return fmt.Errorf("getUserByID [%d]: %v", pr.MergerID, err)
+		}
+	}
+
+	return nil
+}
+
+// LoadAttributes loads pull request attributes from database
+func (pr *PullRequest) LoadAttributes() error {
+	return pr.loadAttributes(db.DefaultContext)
+}
+
+// LoadHeadRepoCtx loads the head repository
+func (pr *PullRequest) LoadHeadRepoCtx(ctx context.Context) (err error) {
+	if !pr.isHeadRepoLoaded && pr.HeadRepo == nil && pr.HeadRepoID > 0 {
+		if pr.HeadRepoID == pr.BaseRepoID {
+			if pr.BaseRepo != nil {
+				pr.HeadRepo = pr.BaseRepo
+				return nil
+			} else if pr.Issue != nil && pr.Issue.Repo != nil {
+				pr.HeadRepo = pr.Issue.Repo
+				return nil
+			}
+		}
+
+		pr.HeadRepo, err = repo_model.GetRepositoryByIDCtx(ctx, pr.HeadRepoID)
+		if err != nil && !repo_model.IsErrRepoNotExist(err) { // Head repo maybe deleted, but it should still work
+			return fmt.Errorf("getRepositoryByID(head): %v", err)
+		}
+		pr.isHeadRepoLoaded = true
+	}
+	return nil
+}
+
+// LoadHeadRepo loads the head repository
+func (pr *PullRequest) LoadHeadRepo() error {
+	return pr.LoadHeadRepoCtx(db.DefaultContext)
+}
+
+// LoadBaseRepo loads the target repository
+func (pr *PullRequest) LoadBaseRepo() error {
+	return pr.LoadBaseRepoCtx(db.DefaultContext)
+}
+
+// LoadBaseRepoCtx loads the target repository
+func (pr *PullRequest) LoadBaseRepoCtx(ctx context.Context) (err error) {
+	if pr.BaseRepo != nil {
+		return nil
+	}
+
+	if pr.HeadRepoID == pr.BaseRepoID && pr.HeadRepo != nil {
+		pr.BaseRepo = pr.HeadRepo
+		return nil
+	}
+
+	if pr.Issue != nil && pr.Issue.Repo != nil {
+		pr.BaseRepo = pr.Issue.Repo
+		return nil
+	}
+
+	pr.BaseRepo, err = repo_model.GetRepositoryByIDCtx(ctx, pr.BaseRepoID)
+	if err != nil {
+		return fmt.Errorf("repo_model.GetRepositoryByID(base): %v", err)
+	}
+	return nil
+}
+
+// LoadIssue loads issue information from database
+func (pr *PullRequest) LoadIssue() (err error) {
+	return pr.LoadIssueCtx(db.DefaultContext)
+}
+
+// LoadIssueCtx loads issue information from database
+func (pr *PullRequest) LoadIssueCtx(ctx context.Context) (err error) {
+	if pr.Issue != nil {
+		return nil
+	}
+
+	pr.Issue, err = GetIssueByID(ctx, pr.IssueID)
+	if err == nil {
+		pr.Issue.PullRequest = pr
+	}
+	return err
+}
+
+// LoadProtectedBranch loads the protected branch of the base branch
+func (pr *PullRequest) LoadProtectedBranch() (err error) {
+	return pr.LoadProtectedBranchCtx(db.DefaultContext)
+}
+
+// LoadProtectedBranchCtx loads the protected branch of the base branch
+func (pr *PullRequest) LoadProtectedBranchCtx(ctx context.Context) (err error) {
+	if pr.ProtectedBranch == nil {
+		if pr.BaseRepo == nil {
+			if pr.BaseRepoID == 0 {
+				return nil
+			}
+			pr.BaseRepo, err = repo_model.GetRepositoryByIDCtx(ctx, pr.BaseRepoID)
+			if err != nil {
+				return
+			}
+		}
+		pr.ProtectedBranch, err = git_model.GetProtectedBranchBy(ctx, pr.BaseRepo.ID, pr.BaseBranch)
+	}
+	return
+}
+
+// ReviewCount represents a count of Reviews
+type ReviewCount struct {
+	IssueID int64
+	Type    ReviewType
+	Count   int64
+}
+
+// GetApprovalCounts returns the approval counts by type
+// FIXME: Only returns official counts due to double counting of non-official counts
+func (pr *PullRequest) GetApprovalCounts(ctx context.Context) ([]*ReviewCount, error) {
+	rCounts := make([]*ReviewCount, 0, 6)
+	sess := db.GetEngine(ctx).Where("issue_id = ?", pr.IssueID)
+	return rCounts, sess.Select("issue_id, type, count(id) as `count`").Where("official = ? AND dismissed = ?", true, false).GroupBy("issue_id, type").Table("review").Find(&rCounts)
+}
+
+// GetApprovers returns the approvers of the pull request
+func (pr *PullRequest) GetApprovers() string {
+	stringBuilder := strings.Builder{}
+	if err := pr.getReviewedByLines(&stringBuilder); err != nil {
+		log.Error("Unable to getReviewedByLines: Error: %v", err)
+		return ""
+	}
+
+	return stringBuilder.String()
+}
+
+func (pr *PullRequest) getReviewedByLines(writer io.Writer) error {
+	maxReviewers := setting.Repository.PullRequest.DefaultMergeMessageMaxApprovers
+
+	if maxReviewers == 0 {
+		return nil
+	}
+
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// Note: This doesn't page as we only expect a very limited number of reviews
+	reviews, err := FindReviews(ctx, FindReviewOptions{
+		Type:         ReviewTypeApprove,
+		IssueID:      pr.IssueID,
+		OfficialOnly: setting.Repository.PullRequest.DefaultMergeMessageOfficialApproversOnly,
+	})
+	if err != nil {
+		log.Error("Unable to FindReviews for PR ID %d: %v", pr.ID, err)
+		return err
+	}
+
+	reviewersWritten := 0
+
+	for _, review := range reviews {
+		if maxReviewers > 0 && reviewersWritten > maxReviewers {
+			break
+		}
+
+		if err := review.loadReviewer(ctx); err != nil && !user_model.IsErrUserNotExist(err) {
+			log.Error("Unable to LoadReviewer[%d] for PR ID %d : %v", review.ReviewerID, pr.ID, err)
+			return err
+		} else if review.Reviewer == nil {
+			continue
+		}
+		if _, err := writer.Write([]byte("Reviewed-by: ")); err != nil {
+			return err
+		}
+		if _, err := writer.Write([]byte(review.Reviewer.NewGitSig().String())); err != nil {
+			return err
+		}
+		if _, err := writer.Write([]byte{'\n'}); err != nil {
+			return err
+		}
+		reviewersWritten++
+	}
+	return committer.Commit()
+}
+
+// GetGitRefName returns git ref for hidden pull request branch
+func (pr *PullRequest) GetGitRefName() string {
+	return fmt.Sprintf("%s%d/head", git.PullPrefix, pr.Index)
+}
+
+// IsChecking returns true if this pull request is still checking conflict.
+func (pr *PullRequest) IsChecking() bool {
+	return pr.Status == PullRequestStatusChecking
+}
+
+// CanAutoMerge returns true if this pull request can be merged automatically.
+func (pr *PullRequest) CanAutoMerge() bool {
+	return pr.Status == PullRequestStatusMergeable
+}
+
+// IsEmpty returns true if this pull request is empty.
+func (pr *PullRequest) IsEmpty() bool {
+	return pr.Status == PullRequestStatusEmpty
+}
+
+// SetMerged sets a pull request to merged and closes the corresponding issue
+func (pr *PullRequest) SetMerged(ctx context.Context) (bool, error) {
+	if pr.HasMerged {
+		return false, fmt.Errorf("PullRequest[%d] already merged", pr.Index)
+	}
+	if pr.MergedCommitID == "" || pr.MergedUnix == 0 || pr.Merger == nil {
+		return false, fmt.Errorf("Unable to merge PullRequest[%d], some required fields are empty", pr.Index)
+	}
+
+	pr.HasMerged = true
+	sess := db.GetEngine(ctx)
+
+	if _, err := sess.Exec("UPDATE `issue` SET `repo_id` = `repo_id` WHERE `id` = ?", pr.IssueID); err != nil {
+		return false, err
+	}
+
+	if _, err := sess.Exec("UPDATE `pull_request` SET `issue_id` = `issue_id` WHERE `id` = ?", pr.ID); err != nil {
+		return false, err
+	}
+
+	pr.Issue = nil
+	if err := pr.LoadIssueCtx(ctx); err != nil {
+		return false, err
+	}
+
+	if tmpPr, err := GetPullRequestByID(ctx, pr.ID); err != nil {
+		return false, err
+	} else if tmpPr.HasMerged {
+		if pr.Issue.IsClosed {
+			return false, nil
+		}
+		return false, fmt.Errorf("PullRequest[%d] already merged but it's associated issue [%d] is not closed", pr.Index, pr.IssueID)
+	} else if pr.Issue.IsClosed {
+		return false, fmt.Errorf("PullRequest[%d] already closed", pr.Index)
+	}
+
+	if err := pr.Issue.LoadRepo(ctx); err != nil {
+		return false, err
+	}
+
+	if err := pr.Issue.Repo.GetOwner(ctx); err != nil {
+		return false, err
+	}
+
+	if _, err := changeIssueStatus(ctx, pr.Issue, pr.Merger, true, true); err != nil {
+		return false, fmt.Errorf("Issue.changeStatus: %v", err)
+	}
+
+	// reset the conflicted files as there cannot be any if we're merged
+	pr.ConflictedFiles = []string{}
+
+	// We need to save all of the data used to compute this merge as it may have already been changed by TestPatch. FIXME: need to set some state to prevent TestPatch from running whilst we are merging.
+	if _, err := sess.Where("id = ?", pr.ID).Cols("has_merged, status, merge_base, merged_commit_id, merger_id, merged_unix, conflicted_files").Update(pr); err != nil {
+		return false, fmt.Errorf("Failed to update pr[%d]: %v", pr.ID, err)
+	}
+
+	return true, nil
+}
+
+// NewPullRequest creates new pull request with labels for repository.
+func NewPullRequest(outerCtx context.Context, repo *repo_model.Repository, issue *Issue, labelIDs []int64, uuids []string, pr *PullRequest) (err error) {
+	idx, err := db.GetNextResourceIndex("issue_index", repo.ID)
+	if err != nil {
+		return fmt.Errorf("generate pull request index failed: %v", err)
+	}
+
+	issue.Index = idx
+
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	ctx.WithContext(outerCtx)
+
+	if err = NewIssueWithIndex(ctx, issue.Poster, NewIssueOptions{
+		Repo:        repo,
+		Issue:       issue,
+		LabelIDs:    labelIDs,
+		Attachments: uuids,
+		IsPull:      true,
+	}); err != nil {
+		if repo_model.IsErrUserDoesNotHaveAccessToRepo(err) || IsErrNewIssueInsert(err) {
+			return err
+		}
+		return fmt.Errorf("newIssue: %v", err)
+	}
+
+	pr.Index = issue.Index
+	pr.BaseRepo = repo
+	pr.IssueID = issue.ID
+	if err = db.Insert(ctx, pr); err != nil {
+		return fmt.Errorf("insert pull repo: %v", err)
+	}
+
+	if err = committer.Commit(); err != nil {
+		return fmt.Errorf("Commit: %v", err)
+	}
+
+	return nil
+}
+
+// GetUnmergedPullRequest returns a pull request that is open and has not been merged
+// by given head/base and repo/branch.
+func GetUnmergedPullRequest(headRepoID, baseRepoID int64, headBranch, baseBranch string, flow PullRequestFlow) (*PullRequest, error) {
+	pr := new(PullRequest)
+	has, err := db.GetEngine(db.DefaultContext).
+		Where("head_repo_id=? AND head_branch=? AND base_repo_id=? AND base_branch=? AND has_merged=? AND flow = ? AND issue.is_closed=?",
+			headRepoID, headBranch, baseRepoID, baseBranch, false, flow, false).
+		Join("INNER", "issue", "issue.id=pull_request.issue_id").
+		Get(pr)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrPullRequestNotExist{0, 0, headRepoID, baseRepoID, headBranch, baseBranch}
+	}
+
+	return pr, nil
+}
+
+// GetLatestPullRequestByHeadInfo returns the latest pull request (regardless of its status)
+// by given head information (repo and branch).
+func GetLatestPullRequestByHeadInfo(repoID int64, branch string) (*PullRequest, error) {
+	pr := new(PullRequest)
+	has, err := db.GetEngine(db.DefaultContext).
+		Where("head_repo_id = ? AND head_branch = ? AND flow = ?", repoID, branch, PullRequestFlowGithub).
+		OrderBy("id DESC").
+		Get(pr)
+	if !has {
+		return nil, err
+	}
+	return pr, err
+}
+
+// GetPullRequestByIndex returns a pull request by the given index
+func GetPullRequestByIndex(ctx context.Context, repoID, index int64) (*PullRequest, error) {
+	if index < 1 {
+		return nil, ErrPullRequestNotExist{}
+	}
+	pr := &PullRequest{
+		BaseRepoID: repoID,
+		Index:      index,
+	}
+
+	has, err := db.GetEngine(ctx).Get(pr)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrPullRequestNotExist{0, 0, 0, repoID, "", ""}
+	}
+
+	if err = pr.loadAttributes(ctx); err != nil {
+		return nil, err
+	}
+	if err = pr.LoadIssueCtx(ctx); err != nil {
+		return nil, err
+	}
+
+	return pr, nil
+}
+
+// GetPullRequestByID returns a pull request by given ID.
+func GetPullRequestByID(ctx context.Context, id int64) (*PullRequest, error) {
+	pr := new(PullRequest)
+	has, err := db.GetEngine(ctx).ID(id).Get(pr)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrPullRequestNotExist{id, 0, 0, 0, "", ""}
+	}
+	return pr, pr.loadAttributes(ctx)
+}
+
+// GetPullRequestByIssueIDWithNoAttributes returns pull request with no attributes loaded by given issue ID.
+func GetPullRequestByIssueIDWithNoAttributes(issueID int64) (*PullRequest, error) {
+	var pr PullRequest
+	has, err := db.GetEngine(db.DefaultContext).Where("issue_id = ?", issueID).Get(&pr)
+	if err != nil {
+		return nil, err
+	}
+	if !has {
+		return nil, ErrPullRequestNotExist{0, issueID, 0, 0, "", ""}
+	}
+	return &pr, nil
+}
+
+// GetPullRequestByIssueID returns pull request by given issue ID.
+func GetPullRequestByIssueID(ctx context.Context, issueID int64) (*PullRequest, error) {
+	pr := &PullRequest{
+		IssueID: issueID,
+	}
+	has, err := db.GetByBean(ctx, pr)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrPullRequestNotExist{0, issueID, 0, 0, "", ""}
+	}
+	return pr, pr.loadAttributes(ctx)
+}
+
+// GetAllUnmergedAgitPullRequestByPoster get all unmerged agit flow pull request
+// By poster id.
+func GetAllUnmergedAgitPullRequestByPoster(uid int64) ([]*PullRequest, error) {
+	pulls := make([]*PullRequest, 0, 10)
+
+	err := db.GetEngine(db.DefaultContext).
+		Where("has_merged=? AND flow = ? AND issue.is_closed=? AND issue.poster_id=?",
+			false, PullRequestFlowAGit, false, uid).
+		Join("INNER", "issue", "issue.id=pull_request.issue_id").
+		Find(&pulls)
+
+	return pulls, err
+}
+
+// Update updates all fields of pull request.
+func (pr *PullRequest) Update() error {
+	_, err := db.GetEngine(db.DefaultContext).ID(pr.ID).AllCols().Update(pr)
+	return err
+}
+
+// UpdateCols updates specific fields of pull request.
+func (pr *PullRequest) UpdateCols(cols ...string) error {
+	_, err := db.GetEngine(db.DefaultContext).ID(pr.ID).Cols(cols...).Update(pr)
+	return err
+}
+
+// UpdateColsIfNotMerged updates specific fields of a pull request if it has not been merged
+func (pr *PullRequest) UpdateColsIfNotMerged(cols ...string) error {
+	_, err := db.GetEngine(db.DefaultContext).Where("id = ? AND has_merged = ?", pr.ID, false).Cols(cols...).Update(pr)
+	return err
+}
+
+// IsWorkInProgress determine if the Pull Request is a Work In Progress by its title
+func (pr *PullRequest) IsWorkInProgress() bool {
+	if err := pr.LoadIssue(); err != nil {
+		log.Error("LoadIssue: %v", err)
+		return false
+	}
+	return HasWorkInProgressPrefix(pr.Issue.Title)
+}
+
+// HasWorkInProgressPrefix determines if the given PR title has a Work In Progress prefix
+func HasWorkInProgressPrefix(title string) bool {
+	for _, prefix := range setting.Repository.PullRequest.WorkInProgressPrefixes {
+		if strings.HasPrefix(strings.ToUpper(title), strings.ToUpper(prefix)) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsFilesConflicted determines if the  Pull Request has changes conflicting with the target branch.
+func (pr *PullRequest) IsFilesConflicted() bool {
+	return len(pr.ConflictedFiles) > 0
+}
+
+// GetWorkInProgressPrefix returns the prefix used to mark the pull request as a work in progress.
+// It returns an empty string when none were found
+func (pr *PullRequest) GetWorkInProgressPrefix() string {
+	if err := pr.LoadIssue(); err != nil {
+		log.Error("LoadIssue: %v", err)
+		return ""
+	}
+
+	for _, prefix := range setting.Repository.PullRequest.WorkInProgressPrefixes {
+		if strings.HasPrefix(strings.ToUpper(pr.Issue.Title), strings.ToUpper(prefix)) {
+			return pr.Issue.Title[0:len(prefix)]
+		}
+	}
+	return ""
+}
+
+// UpdateCommitDivergence update Divergence of a pull request
+func (pr *PullRequest) UpdateCommitDivergence(ctx context.Context, ahead, behind int) error {
+	if pr.ID == 0 {
+		return fmt.Errorf("pull ID is 0")
+	}
+	pr.CommitsAhead = ahead
+	pr.CommitsBehind = behind
+	_, err := db.GetEngine(ctx).ID(pr.ID).Cols("commits_ahead", "commits_behind").Update(pr)
+	return err
+}
+
+// IsSameRepo returns true if base repo and head repo is the same
+func (pr *PullRequest) IsSameRepo() bool {
+	return pr.BaseRepoID == pr.HeadRepoID
+}
+
+// GetPullRequestsByHeadBranch returns all prs by head branch
+// Since there could be multiple prs with the same head branch, this function returns a slice of prs
+func GetPullRequestsByHeadBranch(ctx context.Context, headBranch string, headRepoID int64) ([]*PullRequest, error) {
+	log.Trace("GetPullRequestsByHeadBranch: headBranch: '%s', headRepoID: '%d'", headBranch, headRepoID)
+	prs := make([]*PullRequest, 0, 2)
+	if err := db.GetEngine(ctx).Where(builder.Eq{"head_branch": headBranch, "head_repo_id": headRepoID}).
+		Find(&prs); err != nil {
+		return nil, err
+	}
+	return prs, nil
+}
+
+// GetBaseBranchHTMLURL returns the HTML URL of the base branch
+func (pr *PullRequest) GetBaseBranchHTMLURL() string {
+	if err := pr.LoadBaseRepo(); err != nil {
+		log.Error("LoadBaseRepo: %v", err)
+		return ""
+	}
+	if pr.BaseRepo == nil {
+		return ""
+	}
+	return pr.BaseRepo.HTMLURL() + "/src/branch/" + util.PathEscapeSegments(pr.BaseBranch)
+}
+
+// GetHeadBranchHTMLURL returns the HTML URL of the head branch
+func (pr *PullRequest) GetHeadBranchHTMLURL() string {
+	if pr.Flow == PullRequestFlowAGit {
+		return ""
+	}
+
+	if err := pr.LoadHeadRepo(); err != nil {
+		log.Error("LoadHeadRepo: %v", err)
+		return ""
+	}
+	if pr.HeadRepo == nil {
+		return ""
+	}
+	return pr.HeadRepo.HTMLURL() + "/src/branch/" + util.PathEscapeSegments(pr.HeadBranch)
+}
+
+// UpdateAllowEdits update if PR can be edited from maintainers
+func UpdateAllowEdits(ctx context.Context, pr *PullRequest) error {
+	if _, err := db.GetEngine(ctx).ID(pr.ID).Cols("allow_maintainer_edit").Update(pr); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Mergeable returns if the pullrequest is mergeable.
+func (pr *PullRequest) Mergeable() bool {
+	// If a pull request isn't mergable if it's:
+	// - Being conflict checked.
+	// - Has a conflict.
+	// - Received a error while being conflict checked.
+	// - Is a work-in-progress pull request.
+	return pr.Status != PullRequestStatusChecking && pr.Status != PullRequestStatusConflict &&
+		pr.Status != PullRequestStatusError && !pr.IsWorkInProgress()
+}
+
+// HasEnoughApprovals returns true if pr has enough granted approvals.
+func HasEnoughApprovals(ctx context.Context, protectBranch *git_model.ProtectedBranch, pr *PullRequest) bool {
+	if protectBranch.RequiredApprovals == 0 {
+		return true
+	}
+	return GetGrantedApprovalsCount(ctx, protectBranch, pr) >= protectBranch.RequiredApprovals
+}
+
+// GetGrantedApprovalsCount returns the number of granted approvals for pr. A granted approval must be authored by a user in an approval whitelist.
+func GetGrantedApprovalsCount(ctx context.Context, protectBranch *git_model.ProtectedBranch, pr *PullRequest) int64 {
+	sess := db.GetEngine(ctx).Where("issue_id = ?", pr.IssueID).
+		And("type = ?", ReviewTypeApprove).
+		And("official = ?", true).
+		And("dismissed = ?", false)
+	if protectBranch.DismissStaleApprovals {
+		sess = sess.And("stale = ?", false)
+	}
+	approvals, err := sess.Count(new(Review))
+	if err != nil {
+		log.Error("GetGrantedApprovalsCount: %v", err)
+		return 0
+	}
+
+	return approvals
+}
+
+// MergeBlockedByRejectedReview returns true if merge is blocked by rejected reviews
+func MergeBlockedByRejectedReview(ctx context.Context, protectBranch *git_model.ProtectedBranch, pr *PullRequest) bool {
+	if !protectBranch.BlockOnRejectedReviews {
+		return false
+	}
+	rejectExist, err := db.GetEngine(ctx).Where("issue_id = ?", pr.IssueID).
+		And("type = ?", ReviewTypeReject).
+		And("official = ?", true).
+		And("dismissed = ?", false).
+		Exist(new(Review))
+	if err != nil {
+		log.Error("MergeBlockedByRejectedReview: %v", err)
+		return true
+	}
+
+	return rejectExist
+}
+
+// MergeBlockedByOfficialReviewRequests block merge because of some review request to official reviewer
+// of from official review
+func MergeBlockedByOfficialReviewRequests(ctx context.Context, protectBranch *git_model.ProtectedBranch, pr *PullRequest) bool {
+	if !protectBranch.BlockOnOfficialReviewRequests {
+		return false
+	}
+	has, err := db.GetEngine(ctx).Where("issue_id = ?", pr.IssueID).
+		And("type = ?", ReviewTypeRequest).
+		And("official = ?", true).
+		Exist(new(Review))
+	if err != nil {
+		log.Error("MergeBlockedByOfficialReviewRequests: %v", err)
+		return true
+	}
+
+	return has
+}
+
+// MergeBlockedByOutdatedBranch returns true if merge is blocked by an outdated head branch
+func MergeBlockedByOutdatedBranch(protectBranch *git_model.ProtectedBranch, pr *PullRequest) bool {
+	return protectBranch.BlockOnOutdatedBranch && pr.CommitsBehind > 0
+}