[c] Add show command

dfssc/common/file.go

+package common
+
+import (
+	"encoding/json"
+
+	"dfss/dfssp/contract"
+)
+
+// UnmarshalDFSSFile decodes a json-encoded DFSS file
+func UnmarshalDFSSFile(data []byte) (*contract.JSON, error) {
+
+	c := &contract.JSON{}
+	err := json.Unmarshal(data, c)
+	if err != nil {
+		return nil, err
+	}
+
+	return c, nil
+}

dfssc/common/file_test.go

+package common
+
+import (
+	"io/ioutil"
+	"testing"
+
+	"github.com/bmizerany/assert"
+)
+
+func TestUnmarshalDFSSFile(t *testing.T) {
+	data, err := ioutil.ReadFile("../testdata/file.dfss")
+	assert.Equal(t, nil, err)
+
+	c, err := UnmarshalDFSSFile(data)
+	assert.Equal(t, nil, err)
+	assert.Equal(t, "filename.pdf", c.File.Name)
+	// a tiny test, full unmarshal is tested in dfss/dfssp/contract package
+}

dfssc/main.go

@@ -38,6 +38,7 @@ func init() {
 		fmt.Println("  help      print this help")
 		fmt.Println("  version   print dfss client version")
 		fmt.Println("  register  register a new client")
+		fmt.Println("  show <c>  print contract information from file c")
 
 		fmt.Println("\nFlags:")
 		flag.PrintDefaults()
@@ -85,6 +86,8 @@ func main() {
 			fmt.Println("An error occurred : ", err.Error())
 		}
 
+	case "show":
+		showContract(flag.Arg(1))
 	default:
 		flag.Usage()
 	}

dfssc/show.go

+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"text/template"
+
+	"dfss/dfssc/common"
+)
+
+const contractShowTemplate = `UUID       : {{.UUID}}
+Filename   : {{.File.Name}}
+Filehash   : {{.File.Hash}}
+Created on : {{.Date.Format "2006-01-02 15:04:05 MST"}}
+
+Comment    :
+  {{.Comment}}
+
+Signers    :
+{{range .Signers}}  - {{.Email}}
+{{end}}`
+
+func showContract(filename string) {
+
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		fmt.Println("Cannot open file:", err)
+		return
+	}
+
+	c, err := common.UnmarshalDFSSFile(data)
+	if err != nil {
+		fmt.Println("Corrupted file:", err)
+		return
+	}
+
+	tmpl, err := template.New("contract").Parse(contractShowTemplate)
+	if err != nil {
+		fmt.Println("Internal error:", err)
+		return
+	}
+
+	b := new(bytes.Buffer)
+	err = tmpl.Execute(b, c)
+	if err != nil {
+		fmt.Println("Cannot print contract:", err)
+	}
+
+	fmt.Print(b.String())
+
+}

dfssc/testdata/file.dfss

+{
+  "UUID": "00112233445566778899aabb",
+  "Date": "2000-01-02T03:04:05.000000006-05:00",
+  "Comment": "A test comment\nallow multiline and accents: éÉ",
+  "File": {
+    "Name": "filename.pdf",
+    "Hash": "hash",
+    "Hosted": false
+  },
+  "Signers": [
+    {
+      "Email": "a",
+      "Hash": "ha"
+    },
+    {
+      "Email": "b",
+      "Hash": "hb"
+    }
+  ],
+  "Sequence": null,
+  "TTP": null
+}