blog/blog.go

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// Package blog is a personal website and blogging app.
package blog
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import (
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"fmt"
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"net/http"
"os"
"path/filepath"
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"github.com/gorilla/mux"
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"github.com/jinzhu/gorm"
"github.com/kirsle/blog/jsondb"
"github.com/kirsle/blog/jsondb/caches"
"github.com/kirsle/blog/jsondb/caches/null"
"github.com/kirsle/blog/jsondb/caches/redis"
"github.com/kirsle/blog/models/comments"
"github.com/kirsle/blog/models/posts"
"github.com/kirsle/blog/models/settings"
"github.com/kirsle/blog/models/users"
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"github.com/kirsle/blog/src/controllers/admin"
"github.com/kirsle/blog/src/controllers/authctl"
commentctl "github.com/kirsle/blog/src/controllers/comments"
"github.com/kirsle/blog/src/controllers/contact"
postctl "github.com/kirsle/blog/src/controllers/posts"
questionsctl "github.com/kirsle/blog/src/controllers/questions"
"github.com/kirsle/blog/src/controllers/setup"
"github.com/kirsle/blog/src/log"
"github.com/kirsle/blog/src/markdown"
"github.com/kirsle/blog/src/middleware"
"github.com/kirsle/blog/src/middleware/auth"
"github.com/kirsle/blog/src/models"
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"github.com/kirsle/blog/src/render"
"github.com/kirsle/blog/src/responses"
"github.com/kirsle/blog/src/sessions"
"github.com/shurcooL/github_flavored_markdown/gfmstyle"
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"github.com/urfave/negroni"
)
// Blog is the root application object that maintains the app configuration
// and helper objects.
type Blog struct {
Debug bool
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// DocumentRoot is the core static files root; UserRoot masks over it.
DocumentRoot string
UserRoot string
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db *gorm.DB
jsonDB *jsondb.DB
Cache caches.Cacher
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// Web app objects.
n *negroni.Negroni // Negroni middleware manager
r *mux.Router // Router
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}
// New initializes the Blog application.
func New(documentRoot, userRoot string) *Blog {
// Initialize the SQLite database.
if _, err := os.Stat(filepath.Join(userRoot, ".private")); os.IsNotExist(err) {
os.MkdirAll(filepath.Join(userRoot, ".private"), 0755)
}
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db, err := gorm.Open("sqlite3", filepath.Join(userRoot, ".private", "database.sqlite"))
if err != nil {
panic(err)
}
return &Blog{
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DocumentRoot: documentRoot,
UserRoot: userRoot,
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db: db,
jsonDB: jsondb.New(filepath.Join(userRoot, ".private")),
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Cache: null.New(),
}
}
// Run quickly configures and starts the HTTP server.
func (b *Blog) Run(address string) {
b.Configure()
b.SetupHTTP()
b.ListenAndServe(address)
}
// Configure initializes (or reloads) the blog's configuration, and binds the
// settings in sub-packages.
func (b *Blog) Configure() {
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if b.Debug {
b.db.LogMode(true)
}
// Load the site config, or start with defaults if not found.
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settings.DB = b.jsonDB
config, err := settings.Load()
if err != nil {
config = settings.Defaults()
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}
// Bind configs in sub-packages.
render.UserRoot = &b.UserRoot
render.DocumentRoot = &b.DocumentRoot
// Initialize the session cookie store.
sessions.SetSecretKey([]byte(config.Security.SecretKey))
users.HashCost = config.Security.HashCost
// Initialize the rest of the models.
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posts.DB = b.jsonDB
users.DB = b.jsonDB
comments.DB = b.jsonDB
models.UseDB(b.db)
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// Redis cache?
if config.Redis.Enabled {
addr := fmt.Sprintf("%s:%d", config.Redis.Host, config.Redis.Port)
log.Info("Connecting to Redis at %s/%d", addr, config.Redis.DB)
cache, err := redis.New(
addr,
config.Redis.DB,
config.Redis.Prefix,
)
if err != nil {
log.Error("Redis init error: %s", err.Error())
} else {
b.Cache = cache
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b.jsonDB.Cache = cache
markdown.Cache = cache
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}
}
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b.registerErrors()
}
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// SetupHTTP initializes the Negroni middleware engine and registers routes.
func (b *Blog) SetupHTTP() {
// Initialize the router.
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r := mux.NewRouter()
setup.Register(r)
authctl.Register(r)
admin.Register(r, b.MustLogin)
contact.Register(r)
postctl.Register(r, b.MustLogin)
commentctl.Register(r)
questionsctl.Register(r, b.MustLogin)
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// GitHub Flavored Markdown CSS.
r.Handle("/css/gfm.css", http.StripPrefix("/css", http.FileServer(gfmstyle.Assets)))
r.PathPrefix("/").HandlerFunc(b.PageHandler)
r.NotFoundHandler = http.HandlerFunc(b.PageHandler)
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n := negroni.New(
negroni.NewRecovery(),
negroni.NewLogger(),
negroni.HandlerFunc(sessions.Middleware),
negroni.HandlerFunc(middleware.CSRF(responses.Forbidden)),
negroni.HandlerFunc(auth.Middleware),
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negroni.HandlerFunc(middleware.AgeGate(authctl.AgeGate)),
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)
n.UseHandler(r)
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// Keep references handy elsewhere in the app.
b.n = n
b.r = r
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}
// ListenAndServe begins listening on the given bind address.
func (b *Blog) ListenAndServe(address string) {
log.Info("Listening on %s", address)
http.ListenAndServe(address, b.n)
}
// MustLogin handles errors from the LoginRequired middleware by redirecting
// the user to the login page.
func (b *Blog) MustLogin(w http.ResponseWriter, r *http.Request) {
responses.Redirect(w, "/login?next="+r.URL.Path)
}