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pubengine

A Go blog publishing framework. Ships blog CRUD, admin dashboard, privacy-first analytics, RSS, and sitemap out of the box. You own the templates, pubengine handles everything else.

Built with Echo, templ, talkDOM, Tailwind CSS, and SQLite.

How it works

pubengine is a Go module, not a standalone app. You import it, provide your own templ templates via a ViewFuncs struct, and pubengine wires up all the handlers, middleware, database, caching, and analytics. Think of it like Django for Go blogs: convention over configuration with full template ownership.

+-----------------+       +-------------------+
|  Your Project   |       |    pubengine      |
|                 |       |                   |
|  main.go        |------>|  Handlers         |
|  views/*.templ  |       |  Middleware       |
|  assets/        |       |  Store (SQLite)   |
|  src/           |       |  Cache            |
|  public/        |       |  Analytics        |
|                 |       |  RSS / Sitemap    |
|  ViewFuncs{     |       |  Rate Limiter     |
|    Home: ...,   |       |  Session / CSRF   |
|    Post: ...,   |       |  Markdown         |
|  }              |       |  Image Library    |
+-----------------+       +-------------------+

Quick start

Install the CLI

go install github.com/eringen/pubengine/cmd/pubengine@latest

Scaffold a new project

pubengine new github.com/yourname/myblog
cd myblog

This generates a complete project:

myblog/
├── main.go               # ~40 lines: config + ViewFuncs wiring
├── go.mod
├── views/
│   ├── home.templ        # Home page with blog listing
│   ├── post.templ        # Single post with related posts
│   ├── admin.templ       # Admin login + dashboard + editor
│   ├── nav.templ         # Head, Nav, Footer
│   ├── notfound.templ    # 404 page
│   ├── servererror.templ # 500 page
│   └── helpers.go        # Type aliases for BlogPost, PageMeta
├── assets/
│   └── tailwind.css      # Tailwind directives
├── src/
│   └── app.js            # Custom JavaScript entry point
├── public/
│   ├── robots.txt
│   └── favicon.svg
├── data/                 # SQLite databases (auto created)
├── Makefile
├── package.json
├── tailwind.config.js
├── .env                 # Private generated credentials (ignored by Git)
└── .env.example         # Shareable settings with blank credentials

Run it

go mod tidy
npm install
make run
# Unique admin credentials are in the generated .env.

Your blog is running at http://localhost:3000. Admin dashboard at /admin/.

Upgrading existing sites

The correctness fixes change a few integration points:

  • Set a unique admin password and a random SessionSecret of at least 32 bytes. Known scaffold placeholders are rejected. Session cookies are signed, not encrypted. Rotating the signing key logs out existing sessions.
  • New scaffolds create a private, ignored .env with unique credentials and a shareable .env.example with blank credential fields. Keep .env private; do not replace it with the blank example.
  • SavePost now creates when Revision == 0. To edit, fetch the post with GetPostAny, modify it, and save its OriginalSlug and Revision unchanged. Fetch again after a successful save. Duplicate slugs and stale revisions return ErrPostConflict. Renames retain redirects to published destinations; previous slugs stay reserved until the post is deleted.
  • Existing admin templates must submit hidden original_slug and revision fields and display post.Error. Copy the updated AdminFormPartial scaffold if needed. Validation failures return the submitted content; conflicts return HTTP 409.
  • Deploy the updated analytics client and change its script URL to /public/analytics.js?v=2. The collector requires event (view or duration) and a page_view_id; older ambiguous beacons are rejected. If calling the analytics Go API directly, use store.HashIP and store.GenerateVisitorID so hashing is scoped to the installation.
  • Replace query-value uses of PathEscape with QueryEscape. Update the scaffold's JsonLD component to use templ.JSONScript and include your custom /public/app.min.js bundle.
  • Prefer StartContext(ctx) with a signal-aware context. Shutdown(ctx) drains requests; Close() uses the configured grace period. Both stop background workers and close databases. Create a new App after shutdown. HTTP timeouts are configurable through SiteConfig.
  • For explicit proxy trust, pass WithIPExtractor(...), for example echo.ExtractIPDirect() without a proxy, or an Echo extractor configured for your proxy CIDRs.

Database upgrades run automatically. Back up both databases and uploaded files before upgrading. The new schemas add post revisions/redirects and analytics page-view IDs; do not run older binaries against an upgraded analytics schema. Framework assets and public pages now revalidate instead of retaining long-lived cached copies. Copies already cached under the former policy cannot be recalled; version asset URLs when deploying this upgrade. /llms.txt retains a one-day cache policy.

Usage

The main.go pattern

Every pubengine site follows the same structure:

package main

import (
    "log"

    "github.com/eringen/pubengine"
    "myblog/views"
)

func main() {
    app := pubengine.New(
        pubengine.SiteConfig{
            Name:          pubengine.EnvOr("SITE_NAME", "My Blog"),
            URL:           pubengine.EnvOr("SITE_URL", "http://localhost:3000"),
            Description:   pubengine.EnvOr("SITE_DESCRIPTION", "A blog about things"),
            Author:        pubengine.EnvOr("SITE_AUTHOR", "Your Name"),
            Addr:          pubengine.EnvOr("ADDR", ":3000"),
            DatabasePath:  pubengine.EnvOr("DATABASE_PATH", "data/blog.db"),
            AdminPassword: pubengine.MustEnv("ADMIN_PASSWORD"),
            SessionSecret: pubengine.MustEnv("ADMIN_SESSION_SECRET"),
            CookieSecure:  pubengine.EnvOr("COOKIE_SECURE", "") == "true",
        },
        pubengine.ViewFuncs{
            Home:             views.Home,
            HomePartial:      views.HomePartial,
            BlogSection:      views.BlogSection,
            Post:             views.Post,
            PostPartial:      views.PostPartial,
            AdminLogin:       views.AdminLogin,
            AdminDashboard:   views.AdminDashboard,
            AdminFormPartial: views.AdminFormPartial,
            NotFound:         views.NotFound,
            ServerError:      views.ServerError,
        },
    )
    defer app.Close()

    if err := app.Start(); err != nil {
        log.Fatal(err)
    }
}

ViewFuncs

This is the core inversion of control mechanism. You provide templ components, pubengine calls them from its handlers:

type ViewFuncs struct {
    // Full page renders (initial page load)
    Home             func(posts []BlogPost, activeTag string, tags []string, siteURL string) templ.Component
    Post             func(post BlogPost, posts []BlogPost, siteURL string) templ.Component

    // talkDOM partial renders (SPA like navigation)
    HomePartial      func(posts []BlogPost, activeTag string, tags []string, siteURL string) templ.Component
    BlogSection      func(posts []BlogPost, activeTag string, tags []string) templ.Component
    PostPartial      func(post BlogPost, posts []BlogPost, siteURL string) templ.Component

    // Admin pages
    AdminLogin       func(errorMsg string, csrfToken string, googleLoginURL string) templ.Component
    AdminDashboard   func(posts []BlogPost, message string, csrfToken string) templ.Component
    AdminFormPartial func(post BlogPost, csrfToken string) templ.Component
    AdminImages      func(images []Image, csrfToken string) templ.Component

    // Error pages
    NotFound         func() templ.Component
    ServerError      func() templ.Component
}

The framework selects partial renders using the partial query parameter in the scaffold’s talkDOM requests.

SiteConfig

All configuration in one struct:

Field Type Default Description
Name string "Blog" Site name for nav, footer, RSS, JSON-LD
URL string "http://localhost:3000" Canonical URL for sitemap, RSS, OpenGraph
Description string "" Site description for RSS and meta tags
Author string "" Author name for JSON-LD structured data
Addr string ":3000" Server listen address
DatabasePath string "data/blog.db" SQLite database path
AnalyticsEnabled bool false Enable built in analytics
AnalyticsDatabasePath string "data/analytics.db" Analytics SQLite path
AdminPassword string required Admin login password
SessionSecret string required Session cookie signing key (minimum 32 bytes)
CookieSecure bool false Set true when behind HTTPS
GoogleClientID string "" Google OAuth client ID (optional)
GoogleClientSecret string "" Google OAuth client secret (optional)
GoogleAdminEmail string "" Allowed Google email for admin login (optional)
PostCacheTTL time.Duration 5m In memory post cache TTL
ReadHeaderTimeout time.Duration 5s Limit for reading HTTP headers
ReadTimeout time.Duration 30s Limit for reading an HTTP request
WriteTimeout time.Duration 30s Limit for writing an HTTP response
IdleTimeout time.Duration 1m Keep-alive idle timeout
ShutdownTimeout time.Duration 10s Grace period used by Close

Options

Configure additional behavior with option functions:

// Add custom routes (runs after pubengine's routes)
pubengine.WithCustomRoutes(func(a *pubengine.App) {
    a.Echo.GET("/about/", handleAbout)
    a.Echo.Static("/portfolio", "portfolio")
})

// Change the static assets directory (default: "public")
pubengine.WithStaticDir("static")

Accessing the App

The App struct exposes the underlying components for advanced use:

app := pubengine.New(cfg, views)
// Store and Cache are initialized when Start or StartContext begins.

app.Config    // SiteConfig
app.Echo      // *echo.Echo, the HTTP server
app.Store     // *Store, SQLite operations
app.Cache     // *PostCache, in memory cache
app.Views     // ViewFuncs

Core types

BlogPost

type BlogPost struct {
    Title     string
    Date      string     // "2024-01-15" format
    Tags      []string
    Summary   string
    Link      string     // "/blog/my-post" (auto generated)
    Slug      string     // "my-post"
    Content   string     // Markdown source
    Published bool
    OriginalSlug string // Loaded identity for edits
    Revision int64      // Concurrency token; zero for creates
    Error string        // Editor error, not persisted
}

PageMeta

type PageMeta struct {
    Title       string   // Page title and og:title
    Description string   // Meta description and og:description
    URL         string   // Canonical URL and og:url
    OGType      string   // "website" or "article"
}

Routes

pubengine registers these routes automatically:

Public

Method Path Description
GET / Home page with blog listing
GET /blog/:slug/ Single blog post
GET /feed.xml RSS feed
GET /sitemap.xml XML sitemap
GET /robots.txt Robots.txt (from static dir)
GET /favicon.svg Favicon (from static dir)
GET /public/* Static assets

Admin

Method Path Description
GET /admin/ Login page or dashboard
POST /admin/login/ Process login
POST /admin/logout/ Logout
GET /admin/post/:slug/ Edit post form (talkDOM)
POST /admin/save/ Create or update post
DELETE /admin/post/:slug/ Delete post
GET /admin/images/ Image library (talkDOM)
POST /admin/images/upload/ Upload image
DELETE /admin/images/:filename/ Delete image

Analytics (when enabled)

Method Path Description
POST /api/analytics/collect Track page view
GET /admin/analytics/ Analytics dashboard
GET /admin/analytics/api/stats Stats JSON
GET /admin/analytics/fragments/stats Stats HTML fragment
GET /admin/analytics/api/bot-stats Bot stats JSON
GET /admin/analytics/fragments/bot-stats Bot stats HTML fragment

Helper functions

pubengine exports utility functions for use in your templates:

// URL and path helpers
pubengine.BuildURL(base, "blog", slug)     // "https://example.com/blog/my-post/"
pubengine.PathEscape(tag)                   // URL safe tag encoding
pubengine.Slugify("My Post Title")          // "my-post-title"

// Tag helpers
pubengine.JoinTags(tags)                    // "go, web, sqlite"
pubengine.FilterEmpty(tags)                 // Remove empty strings
pubengine.FilterRelatedPosts(current, all)  // Posts sharing tags

// JSON-LD structured data
pubengine.WebsiteJsonLD(cfg)                // WebSite schema
pubengine.BlogPostingJsonLD(post, cfg)      // BlogPosting schema

// Environment helpers (for main.go)
pubengine.EnvOr("KEY", "default")           // Get env var with fallback
pubengine.MustEnv("KEY")                    // Get env var or log.Fatal

// Template rendering
pubengine.Render(c, component)              // Render as HTTP 200
pubengine.RenderStatus(c, 404, component)   // Render with status code

// Auth helpers
pubengine.IsAdmin(c)                        // Check if session is authenticated
pubengine.CsrfToken(c)                      // Extract CSRF token from context

Markdown

pubengine includes a custom markdown renderer (pubengine/markdown package) with no external dependencies.

Supported syntax

Syntax Output
**bold** or __bold__ bold
*italic* or _italic_ italic
`code` Inline code
# Heading 1 <h1>
## Heading 2 <h2>
### Heading 3 <h3>
[text](url) Link (same tab)
[text](url)^ Link (new tab, adds target="_blank")
![alt](url){style} Image with inline CSS
![alt](url){style|w|h} Image with dimensions
- item Unordered list
1. item Ordered list
> quote Blockquote
``` Code block
```lang Code block with language badge
|col|col| Table
--- Horizontal rule

Usage in templates

import "github.com/eringen/pubengine/markdown"

// In a templ component:
@markdown.Markdown(post.Content)

Programmatic usage

import "github.com/eringen/pubengine/markdown"

var buf bytes.Buffer
markdown.RenderMarkdown(&buf, "**hello** world")
// buf.String() == "<p><strong>hello</strong> world\n</p>"

Security

All text is HTML escaped before formatting. Only http, https, mailto, and tel URL schemes are allowed. Bold/italic regex runs only on text outside HTML tags to prevent URL corruption. First image gets fetchpriority="high" for LCP optimization. Inline code content is protected from bold/italic formatting.

Analytics

pubengine includes a built in, privacy first analytics system. No cookies, no third party scripts, no personal data stored.

How it works

IP addresses are hashed with a salted SHA-256. Each installation has its own persistent salt stored in its database; the salt does not rotate automatically. Visitor IDs are derived from IP + User Agent hash (no cookies). Bot traffic is detected and tracked separately. The system respects Do Not Track (DNT) headers. The App uses automatic cleanup with 365-day retention. Standalone analytics stores can configure their cleanup scheduler. All data stays in your SQLite database.

Enabling analytics

pubengine.SiteConfig{
    AnalyticsEnabled:      true,
    AnalyticsDatabasePath: "data/analytics.db",
    // ...
}

Client side tracking

The framework ships analytics.js as an embedded asset, automatically served at /public/analytics.js. Include it in your template <head>:

<script src="/public/analytics.js?v=2" defer></script>

The script tracks page views and duration with explicit event types and page-view IDs, and handles talkDOM navigation. It uses navigator.sendBeacon for unload tracking, with a fetch fallback. Delivery is best effort. Bot counts cover collector submissions, not every crawler request to the site.

Dashboard

The analytics dashboard is available at /admin/analytics/ (requires admin login). The admin nav bar includes a link to it. It shows:

  • Realtime visitors (last 5 minutes)
  • Unique visitors and total page views
  • Average time on page
  • Top pages and latest visits (last 10)
  • Browser, OS, and device breakdown
  • Referrer sources
  • Daily/hourly/monthly view charts
  • Bot traffic (separate tab with independent period selection)

The dashboard is fully self contained. Its CSS (admin.css) and JS (dashboard.min.js) are embedded in the binary alongside talkdom.js.

Rate limiting

The analytics collect endpoint is rate limited to 60 requests per IP per minute to prevent flooding.

Google OAuth login

pubengine supports an optional Google OAuth login for the admin panel. When configured, a "Sign in with Google" button appears on the login page alongside the password form. Password login always remains available as a fallback.

Setup

  1. Create OAuth credentials in the Google Cloud Console
  2. Set the authorized redirect URI to https://yourdomain.com/admin/auth/google/callback
  3. Set the environment variables:
GOOGLE_CLIENT_ID=your-client-id.apps.googleusercontent.com
GOOGLE_CLIENT_SECRET=your-client-secret
GOOGLE_ADMIN_EMAIL=you@gmail.com

Or in your SiteConfig:

pubengine.SiteConfig{
    GoogleClientID:     pubengine.EnvOr("GOOGLE_CLIENT_ID", ""),
    GoogleClientSecret: pubengine.EnvOr("GOOGLE_CLIENT_SECRET", ""),
    GoogleAdminEmail:   pubengine.EnvOr("GOOGLE_ADMIN_EMAIL", ""),
    // ...
}

All three fields must be set for Google login to be enabled. Only the email matching GOOGLE_ADMIN_EMAIL (case-insensitive) is allowed to log in.

Middleware

pubengine configures a production ready middleware stack:

  1. NonWWWRedirect redirects www. to bare domain
  2. RequestLogger logs method, URI, status code, latency
  3. Recover provides panic recovery with error logging
  4. Security headers include CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy
  5. Session uses cookie based sessions (gorilla/sessions, 12 hour expiry)
  6. CSRF provides token based protection (skipped for analytics endpoint)
  7. Trailing slash enforces consistent URL format
  8. Cache-Control sets stable assets and public pages to revalidate, admin/API/error responses to no-store

Database

Blog database

SQLite at data/blog.db (auto created on first run).

CREATE TABLE posts (
    slug TEXT PRIMARY KEY,
    title TEXT NOT NULL,
    date TEXT NOT NULL,
    tags TEXT NOT NULL,          -- comma delimited: ",go,web,"
    summary TEXT NOT NULL,
    content TEXT NOT NULL,
    published INTEGER NOT NULL DEFAULT 1
);

Analytics database

Separate SQLite at data/analytics.db.

CREATE TABLE visits (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    visitor_id TEXT NOT NULL,
    session_id TEXT NOT NULL,
    ip_hash TEXT NOT NULL,
    browser TEXT NOT NULL,
    os TEXT NOT NULL,
    device TEXT NOT NULL,
    path TEXT NOT NULL,
    referrer TEXT,
    screen_size TEXT,
    timestamp DATETIME NOT NULL,
    duration_sec INTEGER DEFAULT 0
);

CREATE TABLE bot_visits (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    bot_name TEXT NOT NULL,
    ip_hash TEXT NOT NULL,
    user_agent TEXT NOT NULL,
    path TEXT NOT NULL,
    timestamp DATETIME NOT NULL
);

CREATE TABLE settings (
    key TEXT PRIMARY KEY,
    value TEXT NOT NULL
);

Both databases use WAL mode with tuned pragmas (busy_timeout, synchronous=NORMAL, 8MB cache, 256MB mmap) for concurrent read performance.

Store API

The Store provides all blog CRUD operations:

store, err := pubengine.NewStore("data/blog.db")
defer store.Close()

// Published posts (for public pages)
posts, _ := store.ListPosts("")          // all published, newest first
posts, _ := store.ListPosts("go")        // filtered by tag (case insensitive)
post, _  := store.GetPost("my-slug")     // single published post
tags, _  := store.ListTags()             // unique tags from published posts

// All posts (for admin)
posts, _ := store.ListAllPosts()          // including drafts
post, _  := store.GetPostAny("my-slug")  // regardless of published status

// Write operations
store.SavePost(post)                      // create, or update the fetched revision
store.DeletePost("my-slug")              // delete by slug

Cache API

The PostCache wraps the store with an in memory cache:

cache := pubengine.NewPostCache(store, 5*time.Minute)

posts, _ := cache.ListPosts("")     // from cache if fresh, else DB
tags, _  := cache.ListTags()        // from cache
post, _  := cache.GetPost("slug")   // from cached post list

cache.Invalidate()                  // clear on write operations

Project structure

pubengine/
├── pubengine.go           # App struct, New(), Start(), Close()
├── config.go              # SiteConfig, Option functions
├── types.go               # BlogPost, PageMeta, Image
├── store.go               # SQLite blog CRUD
├── cache.go               # In memory post cache
├── handlers.go            # Blog handlers (home, post, feed, sitemap)
├── admin.go               # Admin handlers (login, save, delete, images)
├── middleware.go           # Security headers, sessions, CSRF, cache
├── render.go              # Render helpers
├── helpers.go             # Slugify, BuildURL, JSON-LD, tag utils
├── images.go              # Image upload, resize, library
├── limiter.go             # Login rate limiter
├── rss.go                 # RSS XML generation
├── sitemap.go             # Sitemap XML generation
├── embed.go               # Embedded static assets
├── embedded/
│   ├── talkdom.js          # talkDOM library
│   ├── analytics.js       # Client side tracking script
│   ├── dashboard.min.js   # Analytics dashboard JS
│   └── admin.css          # Analytics dashboard styles
├── markdown/
│   ├── markdown.go        # Custom markdown renderer
│   └── markdown_test.go
├── analytics/
│   ├── analytics.go       # IP hashing, UA parsing, bot detection
│   ├── store.go           # Analytics SQLite operations
│   ├── handlers.go        # Collection + dashboard handlers
│   ├── limiter.go         # Analytics rate limiter
│   ├── sqlcgen/           # Generated SQL (sqlc)
│   └── templates/         # Analytics dashboard templ templates
├── scaffold/
│   ├── scaffold.go        # embed.FS for templates
│   └── templates/         # Project scaffolding templates
├── cmd/pubengine/
│   ├── main.go            # CLI entry point
│   └── new.go             # Scaffold logic
├── store_test.go
├── limiter_test.go
└── go.mod

CLI

pubengine new

pubengine new github.com/yourname/myblog

Creates a new project directory with everything needed to run a blog. The last segment of the module path becomes the directory name (myblog).

Template variables:

  • {{.ProjectName}} is the directory name (e.g., myblog)
  • {{.ModuleName}} is the full module path (e.g., github.com/yourname/myblog)
  • {{.SiteName}} is the title cased name (e.g., Myblog)

pubengine version

pubengine version

Scaffolded project commands

After pubengine new, the generated Makefile and package.json provide:

Make targets

make run          # Generate templates, build CSS + JS, start server
make templ        # Regenerate templ templates
make css          # Build Tailwind CSS
make css-prod     # Production CSS (minified)
make js           # Bundle and minify src/app.js
make test         # Run Go tests
make build-linux  # Cross compile for Linux

npm scripts

npm run css          # Build Tailwind CSS (minified)
npm run css:watch    # Watch mode for CSS
npm run js           # Bundle and minify src/app.js via esbuild
npm run js:watch     # Watch mode for JS
npm run build        # Build both CSS and JS

Environment variables

Variable Required Default Description
ADMIN_PASSWORD yes Admin login password
ADMIN_SESSION_SECRET yes Random cookie signing key (at least 32 bytes)
SITE_NAME no Blog Site name for nav, RSS, JSON-LD
SITE_URL no http://localhost:3000 Canonical URL for sitemap and OpenGraph
SITE_DESCRIPTION no "" Description for RSS and meta tags
SITE_AUTHOR no "" Author name for JSON-LD
COOKIE_SECURE no false Set true behind HTTPS
GOOGLE_CLIENT_ID no "" Google OAuth client ID
GOOGLE_CLIENT_SECRET no "" Google OAuth client secret
GOOGLE_ADMIN_EMAIL no "" Allowed Google email for admin login
DATABASE_PATH no data/blog.db Blog SQLite path
ANALYTICS_DATABASE_PATH no data/analytics.db Analytics SQLite path
ADDR no :3000 Server listen address

Dependencies

Package Version Purpose
echo/v4 v4.14.0 HTTP framework
templ v0.3.960 Type safe HTML templates
modernc.org/sqlite v1.44.2 Pure Go SQLite driver
gorilla/sessions v1.2.2 Cookie session management
echo-contrib v0.17.1 Echo session middleware

No JavaScript framework dependencies. talkDOM and the analytics script are embedded in the binary.

Testing

# Run all tests
go test ./...

# Run with verbose output
go test -v ./...

# Run benchmarks
go test -bench=. ./...

Test coverage includes store operations, rate limiting, and markdown rendering.

Deployment

pubengine compiles to a single binary. Deploy it with your public/ directory and a data/ directory for SQLite:

# Build for Linux
GOOS=linux GOARCH=amd64 go build -o mysite .

# On the server
./mysite
# Needs: public/ directory, data/ directory (auto created), env vars set

The binary embeds talkDOM, the analytics script, the analytics dashboard JS, and the admin CSS. User assets (CSS, JS, fonts, images) live in the public/ directory alongside the binary.

License

MIT MIT

About

A minimal blog engine built with Go, HTMX, and SQLite. One binary, no JS frameworks, just write and publish.

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