Add RSS feed constructor

7 files changed, 139 insertions, 6 deletions

diff --git a/cmd/web/handlers/export.go b/cmd/web/handlers/export.go
new file mode 100644
index 0000000..becdae8
--- /dev/null
+++ b/cmd/web/handlers/export.go
@@ -0,0 +1,109 @@
+package handlers
+
+import (
+	"database/sql"
+	"encoding/xml"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"golang.org/x/net/html"
+
+	"paterissa.net/mblog/internal/models"
+)
+
+type Item struct {
+	XMLName     xml.Name `xml:"item"`
+	Title       string   `xml:"title"`
+	Link        string   `xml:"link"`
+	Description string   `xml:"description"`
+	PubDate     string   `xml:"pubDate"`
+	Content     string   `xml:"content:encoded"`
+}
+
+type Channel struct {
+	XMLName     xml.Name `xml:"channel"`
+	Title       string   `xml:"title"`
+	Link        string   `xml:"link"`
+	Description string   `xml:"description"`
+	Items       []Item   `xml:"item"`
+}
+
+type rssExportContext struct {
+	err *log.Logger
+	db  *sql.DB
+
+	serv string
+}
+
+func (ctx *rssExportContext) feed(w http.ResponseWriter, r *http.Request) {
+	feed := &Channel{
+		Title:       "Paterissa",
+		Link:        ctx.serv,
+		Description: "Blog feed",
+	}
+
+	rows, err := ctx.db.Query("SELECT p.id, u.name, p.time, p.brief, p.content FROM posts p INNER JOIN logins u ON p.user_id = u.id ORDER BY p.id DESC LIMIT 20;")
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("Internal Error"))
+		ctx.err.Printf("Could not load posts from DB: %v\n", err)
+		return
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var p models.Post
+
+		if err = rows.Scan(&p.Id, &p.Name, &p.Time, &p.Brief, &p.Content); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Internal Error"))
+			ctx.err.Printf("Could not load posts from DB: %v\n", err)
+			return
+		}
+
+		p.FormattedTime = p.Time.Format(time.ANSIC)
+
+		title := ""
+		z := html.NewTokenizer(strings.NewReader(string(p.Brief)))
+
+		for {
+			tt := z.Next()
+
+			if tt == html.ErrorToken {
+				break
+			} else if tt == html.StartTagToken {
+				tag := z.Token()
+
+				if tag.Data == "h1" {
+					if tt = z.Next(); tt == html.TextToken {
+						title = z.Token().Data
+					}
+				}
+			}
+		}
+
+		brief := html.EscapeString(string(p.Brief))
+		content := html.EscapeString(string(p.Content))
+
+		feed.Items = append(feed.Items, Item{
+			Title:       title,
+			Link:        ctx.serv + "/post?id=" + strconv.Itoa(p.Id),
+			Description: brief,
+			PubDate:     p.FormattedTime,
+			Content:     content,
+		})
+	}
+
+	out, err := xml.MarshalIndent(feed, "", "  ")
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("Internal Error"))
+		ctx.err.Printf("Could not create RSS feed: %v\n", err)
+		return
+	}
+
+	w.Write([]byte(xml.Header + `<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">` + string(out) + `</rss>`))
+}
diff --git a/cmd/web/handlers/routes.go b/cmd/web/handlers/routes.go
index be48ae3..1c14705 100644
--- a/cmd/web/handlers/routes.go
+++ b/cmd/web/handlers/routes.go
@@ -27,6 +27,12 @@ func RegisterEndpoints(app types.Application, db *sql.DB) *http.ServeMux {
 		err: app.Err,
 		db:  db,
 	}
+	constructor := rssExportContext{
+		err: app.Err,
+		db:  db,
+
+		serv: app.Env.Serv,
+	}
 	audio := fsContext{
 		err:         app.Err,
 		path:        app.AudioDir,
@@ -48,6 +54,7 @@ func RegisterEndpoints(app types.Application, db *sql.DB) *http.ServeMux {
 	blogRouter.HandleFunc("/feeds", auth.CheckAndInvalidate(feeds.index))
 	blogRouter.HandleFunc("/feeds/new", auth.Resolve(feeds.new))
 	blogRouter.HandleFunc("/feed", feeds.feed)
+	blogRouter.HandleFunc("/feed.rss", constructor.feed)
 
 	blogRouter.HandleFunc("/audio", audio.readdir)
 	blogRouter.HandleFunc("/audio/get", audio.get)
diff --git a/cmd/web/main.go b/cmd/web/main.go
index 00286b8..d4deaff 100644
--- a/cmd/web/main.go
+++ b/cmd/web/main.go
@@ -43,6 +43,7 @@ func main() {
 	if err != nil {
 		app.Env.AppPort = 5005
 	}
+	app.Env.Serv = os.Getenv("serv")
 
 	connStr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
 		app.Env.Db.Host,
diff --git a/go.mod b/go.mod
index e227af7..7b651ce 100644
--- a/go.mod
+++ b/go.mod
@@ -6,8 +6,10 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/joho/godotenv v1.5.1
+	github.com/mmcdole/gofeed v1.3.0
 	github.com/yuin/goldmark v1.7.11
 	golang.org/x/crypto v0.37.0
+	golang.org/x/net v0.21.0
 )
 
 require (
@@ -17,11 +19,9 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mmcdole/gofeed v1.3.0 // indirect
 	github.com/mmcdole/goxpp v1.1.1-0.20240225020742-a0c311522b23 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	golang.org/x/net v0.21.0 // indirect
 	golang.org/x/sync v0.13.0 // indirect
 	golang.org/x/text v0.24.0 // indirect
 )
diff --git a/internal/context/environment.go b/internal/context/environment.go
index 3e680cf..844d625 100644
--- a/internal/context/environment.go
+++ b/internal/context/environment.go
@@ -11,6 +11,7 @@ type DbCredentials struct {
 type Environment struct {
 	Webmaster string
 	AppPort   uint64
+	Serv      string
 
 	Db DbCredentials
 }
diff --git a/static/app.css b/static/app.css
index c340259..2ed671f 100644
--- a/static/app.css
+++ b/static/app.css
@@ -22,6 +22,10 @@ pre {
     word-wrap: inherit;
 }
 
+.rss {
+    margin-left: 1.5em;
+}
+
 .lead {
     display: flex;
     flex-direction: row;
@@ -71,7 +75,7 @@ a.icon {
     color: #0fcff0;
 }
 
-a:not(.icon)::after {
+a:not(.icon):not(.rss)::after {
     content: "";
     background: white;
     height: 1px;
@@ -80,17 +84,17 @@ a:not(.icon)::after {
     transition: .16s all 0.025s;
 }
 
-a:not(.icon)::after {
+a:not(.icon):not(.rss)::after {
     left: 100%;
     right: 0;
 }
 
-a:hover ~ a:not(.icon)::after {
+a:hover ~ a:not(.icon):not(.rss)::after {
     left: 0;
     right: 100%;
 }
 
-a:not(.icon):hover::after {
+a:not(.icon):not(.rss):hover::after {
     left: 0;
     right: 0;
 }
@@ -113,6 +117,10 @@ a:not(.icon):hover::after {
     width: 50%;
 }
 
+.rss img {
+    width: 1.5rem;
+}
+
 input {
     background-color: rgba(255, 255, 255, 0.8);
 }
@@ -351,6 +359,10 @@ iframe {
         width: 100%;
     }
 
+    .rss img {
+        width: 1.5rem;
+    }
+
     .inner_pane {
         padding-bottom: 4em;
     }
diff --git a/ui/html/pages/index.tmpl.html b/ui/html/pages/index.tmpl.html
index ee0a0e0..3f30833 100644
--- a/ui/html/pages/index.tmpl.html
+++ b/ui/html/pages/index.tmpl.html
@@ -42,6 +42,9 @@
         </div>
     {{end}}
     <div class="flex_end bottom_elem">
+        <a href="/feed.rss" class="rss">
+            <img src="/static/get?file=images/feed.svg" alt="RSS">
+        </a>
         <div class="right">
             {{if ne .Offset 0}}
                 <a href="/?offset={{sub .Offset 10}}" class="nav_tag">Previous</a>