feat: repo and snapshots packages filter api add 'maximumVersion' query parameter support

example: `curl http://localhost:8080/api/repos/test/packages\?maximumVersion\=1`

Change-Id: Ie9ffd36146bf017bbb353737f32360f7b73d6b0a

api/api.go

@@ -234,6 +234,36 @@ func showPackages(c *gin.Context, reflist *deb.PackageRefList, collectionFactory
 		}
 	}
 
+	// filter packages by version
+	if c.Request.URL.Query().Get("maximumVersion") == "1" {
+		list.PrepareIndex()
+		list.ForEach(func(p *deb.Package) error {
+			versionQ, err := query.Parse(fmt.Sprintf("Name (%s), $Version (<= %s)", p.Name, p.Version))
+			if err != nil {
+				fmt.Println("filter packages by version, query string parse err: ", err)
+				c.AbortWithError(500, fmt.Errorf("unable to parse %s maximum version query string: %s", p.Name, err))
+			} else {
+				tmpList, err := list.Filter([]deb.PackageQuery{versionQ}, false,
+					nil, 0, []string{})
+
+				if err == nil {
+					if tmpList.Len() > 0 {
+						tmpList.ForEach(func(tp *deb.Package) error {
+							list.Remove(tp)
+							return nil
+						})
+						list.Add(p)
+					}
+				} else {
+					fmt.Println("filter packages by version, filter err: ", err)
+					c.AbortWithError(500, fmt.Errorf("unable to get %s maximum version: %s", p.Name, err))
+				}
+			}
+
+			return nil
+		})
+	}
+
 	if c.Request.URL.Query().Get("format") == "details" {
 		list.ForEach(func(p *deb.Package) error {
 			result = append(result, p)

api/api_test.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"bytes"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -128,6 +129,15 @@ func (s *ApiSuite) TestGetMetrics(c *C) {
 	c.Check(b, Matches, ".*aptly_build_info.*version=\"testVersion\".*")
 }
 
+func (s *ApiSuite) TestRepoCreate(c *C) {
+	body, err := json.Marshal(gin.H{
+		"Name": "dummy",
+	})
+	c.Assert(err, IsNil)
+	_, err = s.HTTPRequest("POST", "/api/repos", bytes.NewReader(body))
+	c.Assert(err, IsNil)
+}
+
 func (s *ApiSuite) TestTruthy(c *C) {
 	c.Check(truthy("no"), Equals, false)
 	c.Check(truthy("n"), Equals, false)

api/packages_test.go

@@ -0,0 +1,18 @@
+package api
+
+import (
+	. "gopkg.in/check.v1"
+)
+
+type PackagesSuite struct {
+	ApiSuite
+}
+
+var _ = Suite(&PackagesSuite{})
+
+func (s *PackagesSuite) TestPackagesGetMaximumVersion(c *C) {
+	response, err := s.HTTPRequest("GET", "/api/repos/dummy/packages?maximumVersion=1", nil)
+	c.Assert(err, IsNil)
+	c.Check(response.Code, Equals, 200)
+	c.Check(response.Body.String(), Equals, "[]")
+}