Things are working

page.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"encoding/base32"
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path"
+
+	"github.com/microcosm-cc/bluemonday"
+	"github.com/russross/blackfriday"
+	"github.com/schollz/versionedtext"
+)
+
+var pathToData = "data"
+
+func init() {
+	os.MkdirAll(pathToData, 0755)
+}
+
+type Page struct {
+	Name                    string
+	Text                    versionedtext.VersionedText
+	RenderedPage            string
+	IsLocked                bool
+	PassphraseToUnlock      string
+	IsEncrypted             bool
+	IsPrimedForSelfDestruct bool
+}
+
+func Open(name string) (p *Page) {
+	p = new(Page)
+	p.Name = name
+	p.Text = versionedtext.NewVersionedText("")
+	p.Render()
+	bJSON, err := ioutil.ReadFile(path.Join(pathToData, encodeToBase32(name)+".json"))
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(bJSON, &p)
+	if err != nil {
+		p = new(Page)
+	}
+	return p
+}
+
+func (p *Page) Update(newText string) error {
+	p.Text.Update(newText)
+	p.Render()
+	return p.Save()
+}
+
+func (p *Page) Render() {
+	if p.IsEncrypted {
+		p.RenderedPage = "<code>" + p.Text.GetCurrent() + "</code>"
+		return
+	}
+	p.RenderedPage = MarkdownToHtml(p.Text.GetCurrent())
+}
+
+func MarkdownToHtml(s string) string {
+	unsafe := blackfriday.MarkdownCommon([]byte(s))
+	pClean := bluemonday.UGCPolicy()
+	pClean.AllowElements("img")
+	pClean.AllowAttrs("alt").OnElements("img")
+	pClean.AllowAttrs("src").OnElements("img")
+	pClean.AllowAttrs("class").OnElements("a")
+	pClean.AllowAttrs("href").OnElements("a")
+	pClean.AllowAttrs("id").OnElements("a")
+	pClean.AllowDataURIImages()
+	html := pClean.SanitizeBytes(unsafe)
+	return string(html)
+}
+
+func (p *Page) Save() error {
+	bJSON, err := json.MarshalIndent(p, "", " ")
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(path.Join(pathToData, encodeToBase32(p.Name)+".json"), bJSON, 0755)
+}
+
+func (p *Page) Erase() error {
+	return os.Remove(path.Join(pathToData, encodeToBase32(p.Name)+".json"))
+}
+
+func encodeToBase32(s string) string {
+	return base32.StdEncoding.EncodeToString([]byte(s))
+}
+
+func decodeFromBase32(s string) (s2 string, err error) {
+	bString, err := base32.StdEncoding.DecodeString(s)
+	s2 = string(bString)
+	return
+}