Additional API support for labels (#3290)

* Add API support for labels.

* Error handling for adding/replacing multiple issue labels

* Revisions to function names and error handling. Use issue.ClearLabels in replace/clear functions

* Additional code cleanup

routers/api/v1/repo/label.go

@@ -0,0 +1,123 @@
+// Copyright 2016 The Gogs 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 repo
+
+import (
+	api "github.com/gogits/go-gogs-client"
+
+	"github.com/gogits/gogs/models"
+	"github.com/gogits/gogs/modules/context"
+	"github.com/gogits/gogs/modules/log"
+	"github.com/gogits/gogs/routers/api/v1/convert"
+)
+
+func ListLabels(ctx *context.APIContext) {
+	labels, err := models.GetLabelsByRepoID(ctx.Repo.Repository.ID)
+	if err != nil {
+		ctx.Error(500, "Labels", err)
+		return
+	}
+
+	apiLabels := make([]*api.Label, len(labels))
+	for i := range labels {
+		apiLabels[i] = convert.ToLabel(labels[i])
+	}
+
+	ctx.JSON(200, &apiLabels)
+}
+
+func GetLabel(ctx *context.APIContext) {
+	label, err := models.GetLabelByID(ctx.ParamsInt64(":id"))
+	if err != nil {
+		if models.IsErrLabelNotExist(err) {
+			ctx.Status(404)
+		} else {
+			ctx.Error(500, "GetLabelByID", err)
+		}
+		return
+	}
+
+	ctx.JSON(200, convert.ToLabel(label))
+}
+
+func CreateLabel(ctx *context.APIContext, form api.LabelOption) {
+	if !ctx.Repo.IsWriter() {
+		ctx.Status(403)
+		return
+	}
+
+	label := &models.Label{
+		Name:   form.Name,
+		Color:  form.Color,
+		RepoID: ctx.Repo.Repository.ID,
+	}
+	err := models.NewLabel(label)
+	if err != nil {
+		ctx.Error(500, "NewLabel", err)
+		return
+	}
+
+	label, err = models.GetLabelByID(label.ID)
+	if err != nil {
+		ctx.Error(500, "GetLabelByID", err)
+		return
+	}
+	ctx.JSON(201, convert.ToLabel(label))
+}
+
+func EditLabel(ctx *context.APIContext, form api.LabelOption) {
+	if !ctx.Repo.IsWriter() {
+		ctx.Status(403)
+		return
+	}
+
+	label, err := models.GetLabelByID(ctx.ParamsInt64(":id"))
+	if err != nil {
+		if models.IsErrLabelNotExist(err) {
+			ctx.Status(404)
+		} else {
+			ctx.Error(500, "GetLabelByID", err)
+		}
+		return
+	}
+
+	if len(form.Name) > 0 {
+		label.Name = form.Name
+	}
+	if len(form.Color) > 0 {
+		label.Color = form.Color
+	}
+
+	if err := models.UpdateLabel(label); err != nil {
+		ctx.Handle(500, "UpdateLabel", err)
+		return
+	}
+	ctx.JSON(200, convert.ToLabel(label))
+}
+
+func DeleteLabel(ctx *context.APIContext) {
+	if !ctx.Repo.IsWriter() {
+		ctx.Status(403)
+		return
+	}
+
+	label, err := models.GetLabelByID(ctx.ParamsInt64(":id"))
+	if err != nil {
+		if models.IsErrLabelNotExist(err) {
+			ctx.Status(404)
+		} else {
+			ctx.Error(500, "GetLabelByID", err)
+		}
+		return
+	}
+
+	if err := models.DeleteLabel(ctx.Repo.Repository.ID, ctx.ParamsInt64(":id")); err != nil {
+		ctx.Error(500, "DeleteLabel", err)
+		return
+	}
+
+	log.Trace("Label deleted: %s %s", label.ID, label.Name)
+	ctx.Status(204)
+}