Implement experimental REST API endpoints for plugins (#7279)

* Implement experimental REST API endpoints for plugins

* Updates per feedback and rebase

* Update tests

* Further updates

* Update extraction of plugins

* Use OS temp dir for plugins instead of search path

* Fail extraction on paths that attempt to traverse upward

* Update pluginenv ActivePlugins()

model/manifest_test.go

@@ -0,0 +1,130 @@
+package model
+
+import (
+	"encoding/json"
+	"gopkg.in/yaml.v2"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFindManifest(t *testing.T) {
+	for _, tc := range []struct {
+		Filename       string
+		Contents       string
+		ExpectError    bool
+		ExpectNotExist bool
+	}{
+		{"foo", "bar", true, true},
+		{"plugin.json", "bar", true, false},
+		{"plugin.json", `{"id": "foo"}`, false, false},
+		{"plugin.yaml", `id: foo`, false, false},
+		{"plugin.yaml", "bar", true, false},
+		{"plugin.yml", `id: foo`, false, false},
+		{"plugin.yml", "bar", true, false},
+	} {
+		dir, err := ioutil.TempDir("", "mm-plugin-test")
+		require.NoError(t, err)
+		defer os.RemoveAll(dir)
+
+		path := filepath.Join(dir, tc.Filename)
+		f, err := os.Create(path)
+		require.NoError(t, err)
+		_, err = f.WriteString(tc.Contents)
+		f.Close()
+		require.NoError(t, err)
+
+		m, mpath, err := FindManifest(dir)
+		assert.True(t, (err != nil) == tc.ExpectError, tc.Filename)
+		assert.True(t, (err != nil && os.IsNotExist(err)) == tc.ExpectNotExist, tc.Filename)
+		if !tc.ExpectNotExist {
+			assert.Equal(t, path, mpath, tc.Filename)
+		} else {
+			assert.Empty(t, mpath, tc.Filename)
+		}
+		if !tc.ExpectError {
+			require.NotNil(t, m, tc.Filename)
+			assert.NotEmpty(t, m.Id, tc.Filename)
+		}
+	}
+}
+
+func TestManifestUnmarshal(t *testing.T) {
+	expected := Manifest{
+		Id: "theid",
+		Backend: &ManifestBackend{
+			Executable: "theexecutable",
+		},
+		Webapp: &ManifestWebapp{
+			BundlePath: "thebundlepath",
+		},
+	}
+
+	var yamlResult Manifest
+	require.NoError(t, yaml.Unmarshal([]byte(`
+id: theid
+backend:
+    executable: theexecutable
+webapp:
+    bundle_path: thebundlepath
+`), &yamlResult))
+	assert.Equal(t, expected, yamlResult)
+
+	var jsonResult Manifest
+	require.NoError(t, json.Unmarshal([]byte(`{
+	"id": "theid",
+	"backend": {
+		"executable": "theexecutable"
+	},
+	"webapp": {
+		"bundle_path": "thebundlepath"
+	}
+	}`), &jsonResult))
+	assert.Equal(t, expected, jsonResult)
+}
+
+func TestFindManifest_FileErrors(t *testing.T) {
+	for _, tc := range []string{"plugin.yaml", "plugin.json"} {
+		dir, err := ioutil.TempDir("", "mm-plugin-test")
+		require.NoError(t, err)
+		defer os.RemoveAll(dir)
+
+		path := filepath.Join(dir, tc)
+		require.NoError(t, os.Mkdir(path, 0700))
+
+		m, mpath, err := FindManifest(dir)
+		assert.Nil(t, m)
+		assert.Equal(t, path, mpath)
+		assert.Error(t, err, tc)
+		assert.False(t, os.IsNotExist(err), tc)
+	}
+}
+
+func TestManifestJson(t *testing.T) {
+	manifest := &Manifest{
+		Id: "theid",
+		Backend: &ManifestBackend{
+			Executable: "theexecutable",
+		},
+		Webapp: &ManifestWebapp{
+			BundlePath: "thebundlepath",
+		},
+	}
+
+	json := manifest.ToJson()
+	newManifest := ManifestFromJson(strings.NewReader(json))
+	assert.Equal(t, newManifest, manifest)
+	assert.Equal(t, newManifest.ToJson(), json)
+	assert.Equal(t, ManifestFromJson(strings.NewReader("junk")), (*Manifest)(nil))
+
+	manifestList := []*Manifest{manifest}
+	json = ManifestListToJson(manifestList)
+	newManifestList := ManifestListFromJson(strings.NewReader(json))
+	assert.Equal(t, newManifestList, manifestList)
+	assert.Equal(t, ManifestListToJson(newManifestList), json)
+}