1 files changed, 71 insertions, 0 deletions
diff --git a/modules/context/api.go b/modules/context/api.go
new file mode 100644
index 00000000..8d036be9
--- /dev/null
+++ b/modules/context/api.go
@@ -0,0 +1,71 @@
+// 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 context
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/Unknwon/paginater"
+	"gopkg.in/macaron.v1"
+
+	"github.com/gogits/gogs/modules/base"
+	"github.com/gogits/gogs/modules/log"
+	"github.com/gogits/gogs/modules/setting"
+)
+
+type APIContext struct {
+	*Context
+}
+
+// Error responses error message to client with given message.
+// If status is 500, also it prints error to log.
+func (ctx *APIContext) Error(status int, title string, obj interface{}) {
+	var message string
+	if err, ok := obj.(error); ok {
+		message = err.Error()
+	} else {
+		message = obj.(string)
+	}
+
+	if status == 500 {
+		log.Error(4, "%s: %s", title, message)
+	}
+
+	ctx.JSON(status, map[string]string{
+		"message": message,
+		"url":     base.DOC_URL,
+	})
+}
+
+func (ctx *APIContext) SetLinkHeader(total, pageSize int) {
+	page := paginater.New(total, pageSize, ctx.QueryInt("page"), 0)
+	links := make([]string, 0, 4)
+	if page.HasNext() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"next\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.Next()))
+	}
+	if !page.IsLast() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"last\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.TotalPages()))
+	}
+	if !page.IsFirst() {
+		links = append(links, fmt.Sprintf("<%s%s?page=1>; rel=\"first\"", setting.AppUrl, ctx.Req.URL.Path[1:]))
+	}
+	if page.HasPrevious() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"prev\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.Previous()))
+	}
+
+	if len(links) > 0 {
+		ctx.Header().Set("Link", strings.Join(links, ","))
+	}
+}
+
+func APIContexter() macaron.Handler {
+	return func(c *Context) {
+		ctx := &APIContext{
+			Context: c,
+		}
+		c.Map(ctx)
+	}
+}