Issue due date api (#3890)

* Implemented basic api endpoint to manage deadlines

* Fixed checking for permissions

* Updating a deadline from the ui is now entirely done via the api

* cleanup

* Cosmetics

* fixed lint + fmt

* Added swagger model definition for deadline response

* Updated gitea-sdk

* Updated gitea-sdk

* More cleanup

* Generate swagger json

* Merge branch 'master' of https://github.com/go-gitea/gitea into issue-due-date-api

# Conflicts:
#	public/swagger.v1.json

* Fixed permission to update a deadline via api

* Re-added form to change a deadline

* Added client-side validation + not ignore error messages from the api

* Added locale for error message

* Merge branch 'master' of https://github.com/go-gitea/gitea

# Conflicts:
#	models/issue_comment.go

* Proper date validation

* Fixed indention

* moved css to css file

* added documentation for error codes

* after merge cleanup

* Added swagger description

* DO NOTHING BUT TRIGGER THAT F*CKIN CI SO IT PICKS UP THE LATEST COMMIT AS IT SHOULD

* DO NOTHING BUT TRIGGER THAT F*CKIN CI SO IT PICKS UP THE LATEST COMMIT AS IT SHOULD

* regenerated stylesheets

4 files changed, 81 insertions, 1 deletions

diff --git a/routers/api/v1/api.go b/routers/api/v1/api.go
index 689ea22cca..3174e56374 100644
--- a/routers/api/v1/api.go
+++ b/routers/api/v1/api.go
@@ -447,6 +447,8 @@ func RegisterRoutes(m *macaron.Macaron) {
 							m.Combo("").Get(repo.ListTrackedTimes).
 								Post(reqToken(), bind(api.AddTimeOption{}), repo.AddTime)
 						})
+
+						m.Combo("/deadline").Post(reqToken(), bind(api.EditDeadlineOption{}), repo.UpdateIssueDeadline)
 					})
 				}, mustEnableIssues)
 				m.Group("/labels", func() {
diff --git a/routers/api/v1/repo/issue.go b/routers/api/v1/repo/issue.go
index 7be39166d2..76f58b244e 100644
--- a/routers/api/v1/repo/issue.go
+++ b/routers/api/v1/repo/issue.go
@@ -278,7 +278,7 @@ func EditIssue(ctx *context.APIContext, form api.EditIssueOption) {
 
 	// Update the deadline
 	var deadlineUnix util.TimeStamp
-	if form.Deadline != nil && !form.Deadline.IsZero() {
+	if form.Deadline != nil && !form.Deadline.IsZero() && ctx.Repo.IsWriter() {
 		deadlineUnix = util.TimeStamp(form.Deadline.Unix())
 	}
 
@@ -338,3 +338,72 @@ func EditIssue(ctx *context.APIContext, form api.EditIssueOption) {
 	}
 	ctx.JSON(201, issue.APIFormat())
 }
+
+// UpdateIssueDeadline updates an issue deadline
+func UpdateIssueDeadline(ctx *context.APIContext, form api.EditDeadlineOption) {
+	// swagger:operation POST /repos/{owner}/{repo}/issues/{index}/deadline issue issueEditIssueDeadline
+	// ---
+	// summary: Set an issue deadline. If set to null, the deadline is deleted.
+	// consumes:
+	// - application/json
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: index
+	//   in: path
+	//   description: index of the issue to create or update a deadline on
+	//   type: integer
+	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/EditDeadlineOption"
+	// responses:
+	//   "201":
+	//     "$ref": "#/responses/IssueDeadline"
+	//   "403":
+	//     description: Not repo writer
+	//     schema:
+	//       "$ref": "#/responses/forbidden"
+	//   "404":
+	//     description: Issue not found
+	//     schema:
+	//       "$ref": "#/responses/empty"
+
+	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
+	if err != nil {
+		if models.IsErrIssueNotExist(err) {
+			ctx.Status(404)
+		} else {
+			ctx.Error(500, "GetIssueByIndex", err)
+		}
+		return
+	}
+
+	if !ctx.Repo.IsWriter() {
+		ctx.Status(403)
+		return
+	}
+
+	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
+	}
+
+	ctx.JSON(201, api.IssueDeadline{Deadline: form.Deadline})
+}
diff --git a/routers/api/v1/swagger/issue.go b/routers/api/v1/swagger/issue.go
index 0d4e40616a..16711e9b7e 100644
--- a/routers/api/v1/swagger/issue.go
+++ b/routers/api/v1/swagger/issue.go
@@ -77,3 +77,10 @@ type swaggerResponseTrackedTimeList struct {
 	// in:body
 	Body []api.TrackedTime `json:"body"`
 }
+
+// IssueDeadline
+// swagger:response IssueDeadline
+type swaggerIssueDeadline struct {
+	// in:body
+	Body api.IssueDeadline `json:"body"`
+}
diff --git a/routers/api/v1/swagger/options.go b/routers/api/v1/swagger/options.go
index 4f2461f465..177fe415f1 100644
--- a/routers/api/v1/swagger/options.go
+++ b/routers/api/v1/swagger/options.go
@@ -32,6 +32,8 @@ type swaggerParameterBodies struct {
 	CreateIssueOption api.CreateIssueOption
 	// in:body
 	EditIssueOption api.EditIssueOption
+	// in:body
+	EditDeadlineOption api.EditDeadlineOption
 
 	// in:body
 	CreateIssueCommentOption api.CreateIssueCommentOption