Started working on the frontend

- Added the new post frontend
- Hooked up publishing of posts to the site publisher
- Added an site exporter as a publishing target

services/posts/service.go

@@ -0,0 +1,78 @@
+package posts
+
+import (
+	"context"
+	"time"
+
+	"lmika.dev/lmika/weiro/models"
+	"lmika.dev/lmika/weiro/providers/db"
+	"lmika.dev/lmika/weiro/services/publisher"
+)
+
+type Service struct {
+	db        *db.Provider
+	publisher *publisher.Publisher
+}
+
+func New(db *db.Provider, publisher *publisher.Publisher) *Service {
+	return &Service{
+		db:        db,
+		publisher: publisher,
+	}
+}
+
+type CreatePostParams struct {
+	GUID  string `form:"guid" json:"guid"`
+	Title string `form:"title" json:"title"`
+	Body  string `form:"body" json:"body"`
+}
+
+func (s *Service) PublishPost(ctx context.Context, params CreatePostParams) (*models.Post, error) {
+	site, ok := models.GetSite(ctx)
+	if !ok {
+		return nil, models.SiteRequiredError
+	}
+
+	post, err := s.fetchOrCreatePost(ctx, site, params)
+	if err != nil {
+		return nil, err
+	}
+
+	post.Title = params.Title
+	post.Body = params.Body
+	post.PublishedAt = time.Now()
+	post.Slug = post.BestSlug()
+
+	if err := s.db.SavePost(ctx, post); err != nil {
+		return nil, err
+	}
+
+	// TODO: do on separate thread
+	if err := s.publisher.Publish(ctx, site); err != nil {
+		return nil, err
+	}
+
+	return post, nil
+}
+
+func (s *Service) fetchOrCreatePost(ctx context.Context, site models.Site, params CreatePostParams) (*models.Post, error) {
+	post, err := s.db.SelectPostByGUID(ctx, params.GUID)
+	if err == nil {
+		if post.SiteID != site.ID {
+			return nil, models.NotFoundError
+		}
+
+		return post, nil
+	} else if !db.ErrorIsNoRows(err) {
+		return nil, err
+	}
+
+	post = &models.Post{
+		SiteID:    site.ID,
+		GUID:      params.GUID,
+		Title:     params.Title,
+		Body:      params.Body,
+		CreatedAt: time.Now(),
+	}
+	return post, nil
+}