Implement saving of new and edited posts

srv/src/api/api.go

@@ -216,6 +216,9 @@ func (a *api) handler() http.Handler {
 			apiutil.MethodMux(map[string]http.Handler{
 				"GET":  a.renderPostHandler(),
 				"EDIT": a.editPostHandler(),
+				"POST": authMiddleware(auther,
+					formMiddleware(a.postPostHandler()),
+				),
 				"DELETE": authMiddleware(auther,
 					formMiddleware(a.deletePostHandler()),
 				),

srv/src/api/posts.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/gomarkdown/markdown"
 	"github.com/gomarkdown/markdown/html"
@@ -168,6 +169,35 @@ func (a *api) editPostHandler() http.Handler {
 	})
 }
 
+func (a *api) postPostHandler() http.Handler {
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		p := post.Post{
+			ID:          r.PostFormValue("id"),
+			Title:       r.PostFormValue("title"),
+			Description: r.PostFormValue("description"),
+			Tags:        strings.Fields(r.PostFormValue("tags")),
+			Series:      r.PostFormValue("series"),
+		}
+
+		p.Body = strings.TrimSpace(r.PostFormValue("body"))
+		// textareas encode newlines as CRLF for historical reasons
+		p.Body = strings.ReplaceAll(p.Body, "\r\n", "\n")
+
+		if err := a.params.PostStore.Set(p, time.Now()); err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("storing post with id %q: %w", p.ID, err),
+			)
+			return
+		}
+
+		redirectPath := fmt.Sprintf("posts/%s?method=edit", p.ID)
+
+		a.executeRedirectTpl(rw, r, redirectPath)
+	})
+}
+
 func (a *api) deletePostHandler() http.Handler {
 
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {

srv/src/api/tpl/edit-post.html

@@ -1,17 +1,31 @@
 {{ define "body" }}
 
+  <p>
+    <a href="{{ BlogURL "posts/" }}">
+      <button>Back to Posts</button>
+    </a>
+  </p>
+
   <form method="POST" action="{{ BlogURL "posts/" }}">
 
+    {{ .CSRFFormInput }}
+
     <div class="row">
 
       <div class="columns six">
-        <label for="idInput">Unique ID (e.g. "how-to-fly-a-kite")</label>
-        <input
-            id="idInput"
-            name="id"
-            class="u-full-width"
-            type="text"
-            value="{{ .Payload.ID }}" />
+        <label for="idInput">Unique ID</label>
+        {{ if eq .Payload.ID "" }}
+          <input
+              id="idInput"
+              name="id"
+              class="u-full-width"
+              type="text"
+              placeholder="e.g. how-to-fly-a-kite"
+              value="{{ .Payload.ID }}" />
+        {{ else }}
+          <a href="{{ PostURL .Payload.ID }}" target="_blank">{{ .Payload.ID }}</a>
+          <input name="id" type="hidden" value="{{ .Payload.ID }}" />
+        {{ end }}
       </div>
 
       <div class="columns three">
@@ -68,7 +82,7 @@
          placeholder="Blog body"
          style="height: 50vh;"
          >
-         {{ .Payload.Body }}
+         {{- .Payload.Body -}}
        </textarea>
       </div>
     </div>

srv/src/post/post.go

@@ -124,6 +124,11 @@ func (s *store) withTx(cb func(*sql.Tx) error) error {
 }
 
 func (s *store) Set(post Post, now time.Time) error {
+
+	if post.ID == "" {
+		return errors.New("post ID can't be empty")
+	}
+
 	return s.withTx(func(tx *sql.Tx) error {
 
 		nowTS := now.Unix()