Issue due date (#3794)

* Started adding deadline to ui

* Implemented basic issue due date managing

* Improved UI for due date managing

* Added at least write access to the repo in order to modify issue due dates

* Ui improvements

* Added issue comments creation when adding/modifying/removing a due date

* Show due date in issue list

* Added api support for issue due dates

* Fixed lint suggestions

* Added deadline to sdk

* Updated css

* Added support for adding/modifiying deadlines for pull requests via api

* Fixed comments not created when updating or removing a deadline

* update sdk (will do properly once go-gitea/go-sdk#103 is merged)

* enhanced updateIssueDeadline

* Removed unnessecary Issue.DeadlineString

* UI improvements

* Small improvments to comment creation
+ ui & validation improvements

* Check if an issue is overdue is now a seperate function

* Updated go-sdk with govendor as it was merged

* Simplified isOverdue method

* removed unessecary deadline to 0 set

* Update swagger definitions

* Added missing return

* Added an explanary comment

* Improved updateIssueDeadline method so it'll only update `deadline_unix`

* Small changes and improvements
* no need to explicitly load the issue when updating a deadline, just use whats already there
* small optimisations

* Added check if a deadline was modified before updating it

* Moved comment creating logic into its own function

* Code cleanup for creating deadline comment

* locale improvement

* When modifying a deadline, the old deadline is saved with the comment

* small improvments to xorm session handling when updating an issue deadline
+ style nitpicks

* style nitpicks

* Moved checking for if the user has write acces to middleware

2 files changed, 48 insertions, 14 deletions

diff --git a/routers/api/v1/repo/issue.go b/routers/api/v1/repo/issue.go
index ce13d8a6ed..cc033554f3 100644
--- a/routers/api/v1/repo/issue.go
+++ b/routers/api/v1/repo/issue.go
@@ -163,12 +163,19 @@ func CreateIssue(ctx *context.APIContext, form api.CreateIssueOption) {
 	// responses:
 	//   "201":
 	//     "$ref": "#/responses/Issue"
+
+	var deadlineUnix util.TimeStamp
+	if form.Deadline != nil {
+		deadlineUnix = util.TimeStamp(form.Deadline.Unix())
+	}
+
 	issue := &models.Issue{
-		RepoID:   ctx.Repo.Repository.ID,
-		Title:    form.Title,
-		PosterID: ctx.User.ID,
-		Poster:   ctx.User,
-		Content:  form.Body,
+		RepoID:       ctx.Repo.Repository.ID,
+		Title:        form.Title,
+		PosterID:     ctx.User.ID,
+		Poster:       ctx.User,
+		Content:      form.Body,
+		DeadlineUnix: deadlineUnix,
 	}
 
 	if ctx.Repo.IsWriter() {
@@ -265,6 +272,16 @@ func EditIssue(ctx *context.APIContext, form api.EditIssueOption) {
 		issue.Content = *form.Body
 	}
 
+	var deadlineUnix util.TimeStamp
+	if form.Deadline != nil && !form.Deadline.IsZero() {
+		deadlineUnix = util.TimeStamp(form.Deadline.Unix())
+	}
+
+	if err := models.UpdateIssueDeadline(issue, deadlineUnix, ctx.User); err != nil {
+		ctx.Error(500, "UpdateIssueDeadline", err)
+		return
+	}
+
 	if ctx.Repo.IsWriter() && form.Assignee != nil &&
 		(issue.Assignee == nil || issue.Assignee.LowerName != strings.ToLower(*form.Assignee)) {
 		if len(*form.Assignee) == 0 {
diff --git a/routers/api/v1/repo/pull.go b/routers/api/v1/repo/pull.go
index 742c0bccf9..3ea4b8d327 100644
--- a/routers/api/v1/repo/pull.go
+++ b/routers/api/v1/repo/pull.go
@@ -13,6 +13,7 @@ import (
 	"code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
 
 	api "code.gitea.io/sdk/gitea"
 )
@@ -236,16 +237,22 @@ func CreatePullRequest(ctx *context.APIContext, form api.CreatePullRequestOption
 		return
 	}
 
+	var deadlineUnix util.TimeStamp
+	if form.Deadline != nil {
+		deadlineUnix = util.TimeStamp(form.Deadline.Unix())
+	}
+
 	prIssue := &models.Issue{
-		RepoID:      repo.ID,
-		Index:       repo.NextIssueIndex(),
-		Title:       form.Title,
-		PosterID:    ctx.User.ID,
-		Poster:      ctx.User,
-		MilestoneID: milestoneID,
-		AssigneeID:  assigneeID,
-		IsPull:      true,
-		Content:     form.Body,
+		RepoID:       repo.ID,
+		Index:        repo.NextIssueIndex(),
+		Title:        form.Title,
+		PosterID:     ctx.User.ID,
+		Poster:       ctx.User,
+		MilestoneID:  milestoneID,
+		AssigneeID:   assigneeID,
+		IsPull:       true,
+		Content:      form.Body,
+		DeadlineUnix: deadlineUnix,
 	}
 	pr := &models.PullRequest{
 		HeadRepoID:   headRepo.ID,
@@ -328,6 +335,16 @@ func EditPullRequest(ctx *context.APIContext, form api.EditPullRequestOption) {
 		issue.Content = form.Body
 	}
 
+	var deadlineUnix util.TimeStamp
+	if form.Deadline != nil && !form.Deadline.IsZero() {
+		deadlineUnix = util.TimeStamp(form.Deadline.Unix())
+	}
+
+	if err := models.UpdateIssueDeadline(issue, deadlineUnix, ctx.User); err != nil {
+		ctx.Error(500, "UpdateIssueDeadline", err)
+		return
+	}
+
 	if ctx.Repo.IsWriter() && len(form.Assignee) > 0 &&
 		(issue.Assignee == nil || issue.Assignee.LowerName != strings.ToLower(form.Assignee)) {
 		if len(form.Assignee) == 0 {