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package server
import (
"encoding/json"
"fmt"
"html/template"
"net/http"
"os"
"path/filepath"
"strings"
"iblog/internal/builder"
"iblog/internal/db"
"github.com/gin-gonic/gin"
)
type PostHandler struct {
DB *db.DB
Templates *template.Template
PublicDir string
}
func NewPostHandler(database *db.DB, tmpl *template.Template, publicDir string) *PostHandler {
return &PostHandler{
DB: database,
Templates: tmpl,
PublicDir: publicDir,
}
}
// Serve dispatches to ServeHTML or ServeJSON based on the slug extension.
func (h *PostHandler) Serve(c *gin.Context) {
slug := c.Param("slug")
if strings.HasSuffix(slug, ".json") {
h.ServeJSON(c)
return
}
h.ServeHTML(c)
}
// ServeHTML serves the HTML version of a post.
func (h *PostHandler) ServeHTML(c *gin.Context) {
slug := c.Param("slug")
slug = strings.TrimSuffix(slug, ".html")
post, err := h.DB.GetPostBySlug(slug)
if err != nil {
if toSlug, rerr := h.DB.GetRedirect(slug); rerr == nil {
c.Redirect(http.StatusMovedPermanently, "/"+toSlug)
return
}
c.AbortWithStatus(http.StatusNotFound)
return
}
cacheFile := filepath.Join(h.PublicDir, slug+".html")
// Check cache freshness
if isCacheFresh(cacheFile, post.UpdatedAt) {
if f, err := os.Open(cacheFile); err == nil {
defer f.Close()
info, _ := os.Stat(cacheFile)
c.Header("Content-Type", "text/html; charset=utf-8")
http.ServeContent(c.Writer, c.Request, slug+".html", info.ModTime(), f)
return
}
}
// Render post
html, err := h.renderPostHTML(post)
if err != nil {
fmt.Fprintf(os.Stderr, "render post %s: %v\n", slug, err)
c.AbortWithStatus(http.StatusInternalServerError)
return
}
// Atomic write: write to temp file, then rename
if err := os.MkdirAll(h.PublicDir, 0755); err != nil {
c.AbortWithStatus(http.StatusInternalServerError)
return
}
tmpFile := cacheFile + ".tmp"
if err := os.WriteFile(tmpFile, []byte(html), 0644); err != nil {
c.AbortWithStatus(http.StatusInternalServerError)
return
}
if err := os.Rename(tmpFile, cacheFile); err != nil {
os.Remove(tmpFile)
c.AbortWithStatus(http.StatusInternalServerError)
return
}
// Serve rendered HTML
c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(html))
}
// ServeJSON handles GET /posts/:slug.json and serves the JSON version of a post.
func (h *PostHandler) ServeJSON(c *gin.Context) {
slug := c.Param("slug")
slug = strings.TrimSuffix(slug, ".json")
post, err := h.DB.GetPostBySlug(slug)
if err != nil {
if toSlug, rerr := h.DB.GetRedirect(slug); rerr == nil {
c.Redirect(http.StatusMovedPermanently, "/"+toSlug+".json")
return
}
c.AbortWithStatus(http.StatusNotFound)
return
}
cacheFile := filepath.Join(h.PublicDir, slug+".json")
// Check cache freshness
if isCacheFresh(cacheFile, post.UpdatedAt) {
if f, err := os.Open(cacheFile); err == nil {
defer f.Close()
info, _ := os.Stat(cacheFile)
c.Header("Content-Type", "application/json")
http.ServeContent(c.Writer, c.Request, slug+".json", info.ModTime(), f)
return
}
}
// Generate JSON representation
jsonData := map[string]interface{}{
"slug": post.Slug,
"title": post.Title,
"date": post.Date,
"tags": post.Tags,
"blocks": json.RawMessage(post.Blocks),
}
jsonBytes, _ := json.MarshalIndent(jsonData, "", " ")
// Atomic write
if err := os.MkdirAll(h.PublicDir, 0755); err != nil {
c.AbortWithStatus(http.StatusInternalServerError)
return
}
tmpFile := cacheFile + ".tmp"
if err := os.WriteFile(tmpFile, jsonBytes, 0644); err != nil {
c.AbortWithStatus(http.StatusInternalServerError)
return
}
if err := os.Rename(tmpFile, cacheFile); err != nil {
os.Remove(tmpFile)
c.AbortWithStatus(http.StatusInternalServerError)
return
}
// Serve JSON
c.Header("Content-Type", "application/json")
c.Data(http.StatusOK, "application/json", jsonBytes)
}
// renderPostHTML renders a post to HTML using the base template.
func (h *PostHandler) renderPostHTML(post *db.PostRecord) (string, error) {
htmlBody, scripts, err := builder.RenderEditorJS(post.Blocks)
if err != nil {
return "", fmt.Errorf("render editorjs: %w", err)
}
pageData := builder.PageData{
Title: post.Title,
Content: template.HTML(htmlBody),
ComponentScripts: scripts,
Date: post.Date,
Tags: post.Tags,
Path: "/" + post.Slug,
}
var buf strings.Builder
if err := h.Templates.ExecuteTemplate(&buf, "post.html", pageData); err != nil {
return "", fmt.Errorf("template: %w", err)
}
return buf.String(), nil
}
// isCacheFresh checks if the cache file is newer than the post's updated_at timestamp.
func isCacheFresh(cacheFile string, updatedAtMicros int64) bool {
info, err := os.Stat(cacheFile)
if err != nil {
return false
}
cacheModTime := info.ModTime().UnixMicro()
return cacheModTime >= updatedAtMicros
}
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