osbuild2: add org.osbuild.inline source

Add support for the `org.osbuild.inline` source via a new `InlineSource`
and the corresponding `InlineSourceItem`. A utility function `AddItem`
can be used to conveniently add items based on data (as strings).

internal/osbuild2/inline_source.go

@@ -0,0 +1,41 @@
+package osbuild2
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+)
+
+type InlineSource struct {
+	Items map[string]InlineSourceItem `json:"items"`
+}
+
+func (InlineSource) isSource() {}
+
+type InlineSourceItem struct {
+	Encoding string `json:"encoding"`
+	Data     string `json:"data"`
+}
+
+func NewInlineSource() *InlineSource {
+	return &InlineSource{
+		Items: make(map[string]InlineSourceItem),
+	}
+}
+
+// AddItem a new item to the source. Well hash and encode that data
+// and return the checksum.
+func (s *InlineSource) AddItem(data string) string {
+
+	dataBytes := []byte(data)
+
+	encoded := base64.StdEncoding.EncodeToString(dataBytes)
+	name := fmt.Sprintf("sha256:%x", sha256.Sum256(dataBytes))
+
+	s.Items[name] = InlineSourceItem{
+		Encoding: "base64",
+		Data:     encoded,
+	}
+
+	return name
+}

internal/osbuild2/inline_source_test.go

@@ -0,0 +1,32 @@
+package osbuild2
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInlineSource(t *testing.T) {
+
+	assert := assert.New(t)
+
+	tests := []struct {
+		data    string
+		hash    string
+		encoded string
+	}{
+		{"42\n", "sha256:084c799cd551dd1d8d5c5f9a5d593b2e931f5e36122ee5c793c1d08a19839cc0", "NDIK"},
+		{"Hallo Welt\n", "sha256:f950375066d74787f31cbd8f9f91c71819357cad243fb9d4a0d9ef4fa76709e0", "SGFsbG8gV2VsdAo="},
+	}
+
+	ils := NewInlineSource()
+
+	for _, tt := range tests {
+		hash := ils.AddItem(tt.data)
+		assert.Equal(tt.hash, hash)
+
+		item := ils.Items[hash]
+		assert.Equal(item.Data, tt.encoded)
+	}
+
+}

internal/osbuild2/source.go

@@ -33,6 +33,8 @@ func (sources *Sources) UnmarshalJSON(data []byte) error {
 		switch name {
 		case "org.osbuild.curl":
 			source = new(CurlSource)
+		case "org.osbuild.inline":
+			source = new(InlineSource)
 		case "org.osbuild.ostree":
 			source = new(OSTreeSource)
 		default: