From 93003534e9209956feb330e50d7c7bc000f0e377 Mon Sep 17 00:00:00 2001
From: Las Zenow <zenow@tormail.org>
Date: Tue, 21 Aug 2012 18:15:21 +0200
Subject: [PATCH] Simple epub reader

---
 reader.go           | 106 ++++++++++++++++++++++++++++++++++++++++++++
 template.go         |   1 +
 templates/read.html |  31 +++++++++++++
 trantor.go          |   1 +
 4 files changed, 139 insertions(+)
 create mode 100644 reader.go
 create mode 100644 templates/read.html

diff --git a/reader.go b/reader.go
new file mode 100644
index 0000000..d1004e7
--- /dev/null
+++ b/reader.go
@@ -0,0 +1,106 @@
+package main
+
+import (
+	"html/template"
+	"git.gitorious.org/go-pkg/epub.git"
+	"labix.org/v2/mgo"
+	"labix.org/v2/mgo/bson"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+type readData struct {
+	S    Status
+	Book Book
+	Txt  template.HTML
+	Next  string
+	Prev  string
+}
+
+func parseUrl(url string) (string, string, string) {
+	exp, _ := regexp.Compile("^\\/read\\/([^\\/]*)\\/?(.*\\.([^\\.]*))?$")
+	res := exp.FindStringSubmatch(url)
+	title := res[1]
+	file := ""
+	ext := ""
+	if len(res) == 4 {
+		file = res[2]
+		ext = res[3]
+	}
+	return title, file, ext
+}
+
+func cleanHtml(html string) string {
+	str := strings.Split(html, "<body")
+	if len(str) < 2 {
+		return html
+	}
+	str = strings.SplitN(str[1], ">", 2)
+	if len(str) < 2 {
+		return str[0]
+	}
+
+	return "<div " + str[0] + ">" + strings.Split(str[1], "</body>")[0] + "</div>"
+}
+
+/* return next and prev urls from document */
+func nextPrev(e *epub.Epub, file string, title string) (string, string) {
+	it := e.Iterator(epub.EITERATOR_LINEAR)
+	defer it.Close()
+
+	prev := ""
+	next := ""
+	for it.CurrUrl() != file {
+		prev = it.CurrUrl()
+		_, err := it.Next()
+		if err != nil {
+			break
+		}
+	}
+	if it.CurrUrl() == file {
+		_, err := it.Next()
+		if err == nil {
+			next = it.CurrUrl()
+		}
+	}
+	if prev != "" {
+		prev = "/read/" + title + "/" + prev
+	}
+	if next != "" {
+		next = "/read/" + title + "/" + next
+	}
+	return next, prev
+}
+
+func readHandler(coll *mgo.Collection) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		title, file, ext := parseUrl(r.URL.Path)
+		books, _, err := GetBook(coll, bson.M{"title": title})
+		if err != nil || len(books) == 0 {
+			http.NotFound(w, r)
+			return
+		}
+		book := books[0]
+		e, _ := epub.Open(book.Path, 0)
+		defer e.Close()
+		if file == "" {
+			it := e.Iterator(epub.EITERATOR_LINEAR)
+			defer it.Close()
+			http.Redirect(w, r, "/read/" + title + "/" + it.CurrUrl(), 307)
+			return
+		}
+
+		if ext == "html" || ext == "htm" {
+			var data readData
+			data.S = GetStatus(w, r)
+			data.Book = book
+			data.Next, data.Prev = nextPrev(e, file, title)
+			page := string(e.Data(file))
+			data.Txt = template.HTML(cleanHtml(page))
+			loadTemplate(w, "read", data)
+		} else {
+			w.Write(e.Data(file))
+		}
+	}
+}
diff --git a/template.go b/template.go
index ea0848b..e64cd16 100644
--- a/template.go
+++ b/template.go
@@ -37,6 +37,7 @@ func loadTemplate(w http.ResponseWriter, tmpl string, data interface{}) {
 		TEMPLATE_DIR+"search.html",
 		TEMPLATE_DIR+"upload.html",
 		TEMPLATE_DIR+"new.html",
+		TEMPLATE_DIR+"read.html",
 		TEMPLATE_DIR+"edit.html",
 	))
 
diff --git a/templates/read.html b/templates/read.html
new file mode 100644
index 0000000..5b45ed9
--- /dev/null
+++ b/templates/read.html
@@ -0,0 +1,31 @@
+{{template "header.html" .S}}
+
+<ul class="pager">
+{{if .Prev}}
+  <li class="previous">
+    <a href="{{.Prev}}">&larr; Prev</a>
+  </li>
+{{end}}
+{{if .Next}}
+  <li class="next">
+    <a href="{{.Next}}">Next &rarr;</a>
+  </li>
+{{end}}
+</ul>
+
+{{.Txt}}
+
+<ul class="pager">
+{{if .Prev}}
+  <li class="previous">
+    <a href="{{.Prev}}">&larr; Prev</a>
+  </li>
+{{end}}
+{{if .Next}}
+  <li class="next">
+    <a href="{{.Next}}">Next &rarr;</a>
+  </li>
+{{end}}
+</ul>
+
+{{template "footer.html"}}
diff --git a/trantor.go b/trantor.go
index 03fef9e..68dee14 100644
--- a/trantor.go
+++ b/trantor.go
@@ -136,6 +136,7 @@ func main() {
 	http.HandleFunc("/new/", newHandler(newColl))
 	http.HandleFunc("/delnew/", deleteHandler(newColl, "/new/"))
 	http.HandleFunc("/store/", storeHandler(newColl, coll))
+	http.HandleFunc("/read/", readHandler(coll))
 	http.HandleFunc("/edit/", editHandler(coll))
 	http.HandleFunc("/save/", saveHandler(coll))
 	http.HandleFunc("/delete/", deleteHandler(coll, "/"))