create web interface

cmd/cli/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"os"
 
 	"git.32bit.cafe/yequari/rss-gen/rss"
 )
@@ -16,7 +17,10 @@ func main() {
     if *siteUrl == "" || *siteTitle == "" || *siteDesc == "" {
         flag.PrintDefaults()
     }
-
-    fmt.Println(rss.GenerateRss(*siteUrl, *siteTitle, *siteDesc, flag.Args()...))
+    feed, err := rss.GenerateRss(*siteUrl, *siteTitle, *siteDesc, flag.Args()...)
+    if err != nil {
+	os.Stderr.WriteString(err.Error())
+    }
+    fmt.Println(feed)
 }
 

cmd/web/handlers.go

@@ -1,9 +1,38 @@
 package main
 
-import "net/http"
+import (
+	"html"
+	"net/http"
+	"strings"
+
+	"git.32bit.cafe/yequari/rss-gen/rss"
+)
 
 func (app *application) home(w http.ResponseWriter, r *http.Request) {
+    if r.URL.Path != "/" {
+        http.NotFound(w, r)
+        return
+    }
+
+    app.render(w, http.StatusOK, "home.tmpl.html", nil)
 }
 
 func (app *application) generateRss(w http.ResponseWriter, r *http.Request) {
+    q := r.URL.Query()
+    siteName := q.Get("site-name")
+    siteUrl := q.Get("site-url")
+    siteDesc := q.Get("site-description")
+    pageUrls := q.Get("page-urls")
+    pages := strings.Split(pageUrls, "\n")
+    for i := range pages {
+        pages[i] = strings.TrimSpace(pages[i])
+    }
+
+    feed, err := rss.GenerateRss(siteUrl, siteName, siteDesc, pages...)
+    if err != nil {
+        app.infoLog.Printf("Error generating feed: %s\n", err.Error())
+    }
+    for _, line := range strings.Split(feed, "\n") {
+        w.Write([]byte(html.EscapeString(line) + "\n"))
+    }
 }

cmd/web/helpers.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+	"path"
+	"runtime/debug"
+	"strings"
+)
+
+func (app *application) serverError(w http.ResponseWriter, err error) {
+    trace := fmt.Sprintf("%s\n%s", err.Error(), debug.Stack())
+    app.errorLog.Print(trace)
+
+    http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+}
+
+func (app *application) clientError(w http.ResponseWriter, status int) {
+    http.Error(w, http.StatusText(status), status)
+}
+
+func (app *application) notFound(w http.ResponseWriter) {
+    app.clientError(w, http.StatusNotFound)
+}
+
+func (app *application) cleanUrl(url string) string {
+    s := strings.TrimPrefix(url, "http://")
+    s = strings.TrimPrefix(s, "https://")
+    s = path.Base(path.Clean(s))
+    s = "http://" + s
+    return s
+}
+
+func (app *application) render(w http.ResponseWriter, status int, page string, data *templateData) {
+    ts, ok := app.templateCache[page]
+    if !ok {
+        err := fmt.Errorf("the template %s does not exist", page)
+        app.serverError(w, err)
+        return
+    }
+
+    // a buffer to attempt to write the template to
+    // before writing it to the ResponseWriter w
+    buf := new(bytes.Buffer)
+
+    err := ts.ExecuteTemplate(buf, "base", data)
+    if err != nil {
+        app.serverError(w, err)
+        return
+    }
+
+    w.WriteHeader(status)
+
+    buf.WriteTo(w)
+}

cmd/web/main.go

@@ -5,11 +5,13 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"text/template"
 )
 
 type application struct {
     errorLog *log.Logger
     infoLog *log.Logger
+    templateCache map[string]*template.Template
 }
 
 func main() {
@@ -20,9 +22,15 @@ func main() {
     infoLog := log.New(os.Stdout, "INFO\t", log.Ldate|log.Ltime)
     errorLog := log.New(os.Stderr, "ERROR\t", log.Ldate|log.Ltime|log.Lshortfile)
 
+    templateCache, err := newTemplateCache()
+    if err != nil {
+        errorLog.Fatal(err)
+    }
+
     app := &application {
         errorLog: errorLog,
         infoLog: infoLog,
+        templateCache: templateCache,
     }
 
     srv := &http.Server {
@@ -32,6 +40,6 @@ func main() {
     }
 
     infoLog.Printf("Starting server on %s", *addr)
-    err := srv.ListenAndServe()
+    err = srv.ListenAndServe()
     errorLog.Fatal(err)
 }

cmd/web/templates.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"path/filepath"
+	"text/template"
+)
+
+type templateData struct {
+}
+
+func newTemplateCache() (map[string]*template.Template, error) {
+    cache := map[string]*template.Template{}
+
+    pages, err := filepath.Glob("./ui/html/pages/*.tmpl.html")
+    if err != nil {
+        return nil, err
+    }
+
+    for _, page := range pages {
+        name := filepath.Base(page)
+
+        ts, err := template.ParseFiles("./ui/html/base.tmpl.html")
+        if err != nil {
+            return nil, err
+        }
+
+        // parse all partials into the template set
+        ts, err = ts.ParseGlob("./ui/html/partials/*.tmpl.html")
+        if err != nil {
+            return nil, err
+        }
+
+        // parse the page template last
+        ts, err = ts.ParseFiles(page)
+        if err != nil {
+            return nil, err
+        }
+
+        cache[name] = ts
+    }
+
+    return cache, nil
+}

rss/rss.go

@@ -17,8 +17,7 @@ const feedfmt = `<?xml version="1.0" encoding="utf-8"?>
             <description>%s</description>
             %s
         </channel>
-    </rss>
-    `
+    </rss>`
 
 const itemfmt = `<item>
                 <title>Content Title</title>
@@ -26,7 +25,7 @@ const itemfmt = `<item>
                 <guid>%s</guid>
                 <pubDate>%s</pubDate>
                 <description><![CDATA[%s]]></description>
-            </item>`;
+            </item>`
 
 func fetchPage(url string) (string, error) {
     resp, err := http.Get(url)
@@ -102,6 +101,7 @@ func GenerateRss(siteUrl, siteTitle, siteDesc string, pageUrls ...string) (strin
     var err error
 
     for _, u := range pageUrls {
+        var err error
         page, err := fetchPage(u)
         if err != nil {
             continue

ui/html/base.tmpl.html

@@ -0,0 +1,16 @@
+{{define "base"}}
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <link rel="stylesheet" href="/static/css/main.css">
+        <title>RSS Generator</title>
+        <script src="/static/js/htmx.min.js"></script>
+    </head>
+    <body>
+        <main>
+            {{template "main" .}}
+        </main>
+    </body>
+</html>
+{{end}}

ui/html/pages/home.tmpl.html

@@ -0,0 +1,35 @@
+{{define "main"}}
+    <h1>yequari's RSS Feed Generator</h1>
+    <!--<form action="/generate" method="get" id="generate-form">-->
+    <form id="generate-form">
+        <p>
+            <label>
+                Site Name:
+                <input name="site-name" />
+            </label>
+        </p>
+        <p>
+            <label>
+                Site URL:
+                <input name="site-url" />
+            </label>
+        </p>
+        <p>
+            <label>
+                Site Description:
+                <input name="site-description" />
+            </label>
+        </p>
+        <p>
+            <label>
+                Pages to Include:
+                <textarea name="page-urls" cols="40" rows="6">List of URLs, one per line</textarea>
+            </label>
+        </p>
+        <button id="generate-button" hx-get="/generate" hx-include="#generate-form" hx-params="*" hx-target="#output">Generate</button>
+    </form>
+    <div class="output-container">
+        <code id="output">
+        </code>
+    </div>
+{{end}}

ui/static/css/main.css

@@ -0,0 +1,3 @@
+#output {
+    white-space: pre;
+}