From 01b538aee297e4910b4df985c02cb25055f45b70 Mon Sep 17 00:00:00 2001
From: mappu <mappu04@gmail.com>
Date: Tue, 11 Jul 2017 19:08:22 +1200
Subject: [PATCH] RSS implementation

---
 ServerOptions.go           |  8 ++++++
 WikiServer.go              |  4 +++
 cmd/yatwiki-server/main.go |  1 +
 rRSS.go                    | 51 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 rRSS.go

diff --git a/ServerOptions.go b/ServerOptions.go
index b82d790..e541dff 100644
--- a/ServerOptions.go
+++ b/ServerOptions.go
@@ -14,8 +14,12 @@ type ServerOptions struct {
 	FaviconFilePath      string
 	AllowDBDownload      bool
 	RecentChanges        int
+	RecentChangesRSS     int
 	GzipCompressionLevel int
 	BannedUserIPRegexes  []string
+	ExternalBaseURL      string
+	DeclareRSSLanguage   string
+	DeclareRSSEmail      string
 }
 
 func DefaultOptions() *ServerOptions {
@@ -29,7 +33,11 @@ func DefaultOptions() *ServerOptions {
 		FaviconFilePath:      "", // no favicon
 		AllowDBDownload:      true,
 		RecentChanges:        20,
+		RecentChangesRSS:     10,
 		GzipCompressionLevel: 9,
 		BannedUserIPRegexes:  make([]string, 0),
+		ExternalBaseURL:      "/",
+		DeclareRSSLanguage:   "en-GB",
+		DeclareRSSEmail:      `nobody@example.com`,
 	}
 }
diff --git a/WikiServer.go b/WikiServer.go
index 71ad7c8..2b06431 100644
--- a/WikiServer.go
+++ b/WikiServer.go
@@ -92,6 +92,10 @@ func (this *WikiServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			this.routeIndex(w, r)
 			return
 
+		} else if remainingPath == "rss/changes" {
+			this.routeRecentChangesRSS(w, r)
+			return
+
 		} else if remainingPath == "" {
 			this.serveRedirect(w, this.opts.ExpectBaseURL+`view/`+url.QueryEscape(this.opts.DefaultPage))
 			return
diff --git a/cmd/yatwiki-server/main.go b/cmd/yatwiki-server/main.go
index 5fb35ed..8510759 100644
--- a/cmd/yatwiki-server/main.go
+++ b/cmd/yatwiki-server/main.go
@@ -21,6 +21,7 @@ func main() {
 	opts.DBFilePath = *dbPath
 	opts.FaviconFilePath = *faviconPath
 	opts.Timezone = time.Local.String()
+	opts.ExternalBaseURL = "http://" + *bindAddr + "/"
 
 	ws, err := yatwiki3.NewWikiServer(opts)
 	if err != nil {
diff --git a/rRSS.go b/rRSS.go
new file mode 100644
index 0000000..52d54cd
--- /dev/null
+++ b/rRSS.go
@@ -0,0 +1,51 @@
+package yatwiki3
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+func (this *WikiServer) routeRecentChangesRSS(w http.ResponseWriter, r *http.Request) {
+	recents, err := this.db.GetRecentChanges(0, this.opts.RecentChangesRSS)
+	if err != nil {
+		this.serveInternalError(w, r, err)
+		return
+	}
+
+	content := `<?xml version="1.0" encoding="UTF-8" ?> 
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"> 
+	<channel>
+		<title>` + template.HTMLEscapeString(this.opts.PageTitle) + `</title>
+		<link>` + template.HTMLEscapeString(this.opts.ExternalBaseURL) + `</link>
+		<description>` + template.HTMLEscapeString(this.opts.PageTitle) + `</description>
+		<language>` + template.HTMLEscapeString(this.opts.DeclareRSSLanguage) + `</language>
+		<atom:link href="` + template.HTMLEscapeString(this.opts.ExternalBaseURL+`rss/changes`) + `" rel="self" type="application/rss+xml" />
+`
+	for _, a := range recents {
+		content += `
+		<item>
+			<title>` + template.HTMLEscapeString(a.Title+` (r`+fmt.Sprintf("%d", a.ID)+`)`) + `</title>
+			<link>` + template.HTMLEscapeString(this.opts.ExternalBaseURL+`archive/`+fmt.Sprintf("%d", a.ID)) + `</link>
+			<guid>` + template.HTMLEscapeString(this.opts.ExternalBaseURL+`archive/`+fmt.Sprintf("%d", a.ID)) + `</guid>
+			<author>` + template.HTMLEscapeString(this.opts.DeclareRSSEmail+` (`+this.opts.PageTitle+` `+a.Author+`)`) + `</author>
+			<pubDate>` + template.HTMLEscapeString(time.Unix(a.Modified, 0).In(this.loc).Format(time.RFC1123Z)) + `</pubDate>
+			<description>` + template.HTMLEscapeString(`
+				<a href="`+template.HTMLEscapeString(this.opts.ExternalBaseURL+`view/`+url.QueryEscape(a.Title))+`">latest version</a>
+				|
+				<a href="`+template.HTMLEscapeString(this.opts.ExternalBaseURL+`archive/`+fmt.Sprintf("%d", a.ID))+`">revision `+fmt.Sprintf("%d", a.ID)+`</a>
+				|
+				<a href="`+template.HTMLEscapeString(this.opts.ExternalBaseURL+`diff/parent/`+fmt.Sprintf("%d", a.ID))+`">diff to previous</a>
+			`) + `</description>
+		</item>
+		`
+	}
+	content += `
+	</channel>
+</rss>`
+
+	w.Header().Set(`Content-Type`, `application/rss+xml`)
+	w.Write([]byte(content))
+}