Add json fmt support

template.go

@@ -1,9 +1,16 @@
 package main
 
-import log "github.com/cihub/seelog"
-import txt_tmpl "text/template"
+import (
+	txt_tmpl "text/template"
 
-import "html/template"
+	"git.gitorious.org/trantor/trantor.git/database"
+	log "github.com/cihub/seelog"
+
+	"encoding/json"
+	"errors"
+	"html/template"
+	"net/http"
+)
 
 type Status struct {
 	BaseURL  string
@@ -32,7 +39,8 @@ func GetStatus(h handler) Status {
 	return s
 }
 
-var tmpl_html = template.Must(template.ParseFiles(TEMPLATE_PATH+"header.html",
+var tmpl_html = template.Must(template.ParseFiles(
+	TEMPLATE_PATH+"header.html",
 	TEMPLATE_PATH+"footer.html",
 	TEMPLATE_PATH+"404.html",
 	TEMPLATE_PATH+"index.html",
@@ -52,16 +60,20 @@ var tmpl_html = template.Must(template.ParseFiles(TEMPLATE_PATH+"header.html",
 	TEMPLATE_PATH+"help.html",
 ))
 
-var tmpl_rss = txt_tmpl.Must(txt_tmpl.ParseFiles(TEMPLATE_PATH+"search.rss",
+var tmpl_rss = txt_tmpl.Must(txt_tmpl.ParseFiles(
+	TEMPLATE_PATH+"search.rss",
 	TEMPLATE_PATH+"news.rss",
 ))
 
 func loadTemplate(h handler, tmpl string, data interface{}) {
 	var err error
 	fmt := h.r.FormValue("fmt")
-	if fmt == "rss" {
+	switch fmt {
+	case "rss":
 		err = tmpl_rss.ExecuteTemplate(h.w, tmpl+".rss", data)
-	} else {
+	case "json":
+		err = loadJson(h.w, tmpl, data)
+	default:
 		err = tmpl_html.ExecuteTemplate(h.w, tmpl+".html", data)
 	}
 	if err != nil {
@@ -69,3 +81,113 @@ func loadTemplate(h handler, tmpl string, data interface{}) {
 		log.Warn("An error ocurred loading the template ", tmpl, ".", fmt, ": ", err)
 	}
 }
+
+func loadJson(w http.ResponseWriter, tmpl string, data interface{}) error {
+	var res []byte
+	var err error
+	switch tmpl {
+	case "index":
+		res, err = indexJson(data)
+	case "book":
+		res, err = bookJson(data)
+	case "news":
+		res, err = newsJson(data)
+	case "search":
+		res, err = searchJson(data)
+	}
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(res)
+	return err
+}
+
+func indexJson(data interface{}) ([]byte, error) {
+	index, ok := data.(indexData)
+	if !ok {
+		return nil, errors.New("Data is not valid")
+	}
+
+	books := make([]map[string]interface{}, len(index.Books))
+	for i, book := range index.Books {
+		books[i] = bookJsonRaw(book)
+	}
+	news := newsJsonRaw(index.News)
+
+	return json.Marshal(map[string]interface{}{
+		"title":      "Imperial Library of Trantor",
+		"url":        index.S.BaseURL,
+		"count":      index.Count,
+		"news":       news,
+		"tags":       index.Tags,
+		"last added": books,
+	})
+}
+
+func bookJson(data interface{}) ([]byte, error) {
+	book, ok := data.(bookData)
+	if !ok {
+		return nil, errors.New("Data is not valid")
+	}
+
+	return json.Marshal(bookJsonRaw(book.Book))
+}
+
+func newsJson(data interface{}) ([]byte, error) {
+	news, ok := data.(newsData)
+	if !ok {
+		return nil, errors.New("Data is not valid")
+	}
+
+	return json.Marshal(newsJsonRaw(news.News))
+}
+
+func newsJsonRaw(news []newsEntry) []map[string]string {
+	list := make([]map[string]string, len(news))
+	for i, n := range news {
+		list[i] = map[string]string{
+			"date": n.Date,
+			"text": n.Text,
+		}
+	}
+	return list
+}
+
+func searchJson(data interface{}) ([]byte, error) {
+	search, ok := data.(searchData)
+	if !ok {
+		return nil, errors.New("Data is not valid")
+	}
+
+	books := make([]map[string]interface{}, len(search.Books))
+	for i, book := range search.Books {
+		books[i] = bookJsonRaw(book)
+	}
+	return json.Marshal(books)
+}
+
+func bookJsonRaw(book database.Book) map[string]interface{} {
+	cover := ""
+	coverSmall := ""
+	if book.Cover {
+		cover = "/cover/" + book.Id + "/big/" + book.Title + ".jpg"
+		coverSmall = "/cover/" + book.Id + "/small/" + book.Title + ".jpg"
+	}
+	return map[string]interface{}{
+		"id":          book.Id,
+		"title":       book.Title,
+		"author":      book.Author,
+		"contributor": book.Contributor,
+		"publisher":   book.Publisher,
+		"description": book.Description,
+		"subject":     book.Subject,
+		"date":        book.Date,
+		"lang":        book.Lang,
+		"isbn":        book.Isbn,
+		"size":        book.FileSize,
+		"cover":       cover,
+		"cover_small": coverSmall,
+		"download":    "/download/" + book.Id + "/" + book.Title + ".epub",
+		"read":        "/read/" + book.Id,
+	}
+}