web.go 9.84 KB
Newer Older
ale's avatar
ale committed
1 2 3 4 5 6 7 8
package liber

import (
	"bytes"
	"encoding/json"
	"flag"
	"fmt"
	"html/template"
9 10 11 12
	"image"
	_ "image/gif"
	"image/jpeg"
	_ "image/png"
ale's avatar
ale committed
13 14
	"io"
	"log"
15
	"net"
ale's avatar
ale committed
16
	"net/http"
ale's avatar
ale committed
17
	"net/url"
18
	"os"
ale's avatar
ale committed
19 20 21 22 23
	"path/filepath"
	"strconv"
	"strings"
	"time"

24 25
	"github.com/gorilla/mux"
	"github.com/nfnt/resize"
ale's avatar
ale committed
26 27 28
)

var (
29
	htdocsDir = flag.String("htdocs", "/usr/share/liber/htdocs", "location of static html content")
ale's avatar
ale committed
30 31 32 33 34 35

	tpl *template.Template
)

type uiServer struct {
	db      *Database
36 37
	storage *RWFileStorage
	cache   *RWFileStorage
ale's avatar
ale committed
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
}

type pagination struct {
	PageSize int
	Page     int
	Total    int
}

func (p *pagination) IsFirstPage() bool {
	return p.Page == 0
}

func (p *pagination) IsLastPage() bool {
	return (p.PageSize * (p.Page + 1)) >= p.Total
}

func (p *pagination) Prev() int {
	return p.Page - 1
}

func (p *pagination) Next() int {
	return p.Page + 1
}

func (p *pagination) Start() int {
	return (p.PageSize * p.Page) + 1
}

func (p *pagination) End() int {
	end := (p.PageSize*(p.Page+1) - 1)
	if end >= p.Total {
		end = p.Total - 1
	}
	return end + 1
}

func (s *uiServer) handleSearch(w http.ResponseWriter, req *http.Request) {
	query := req.FormValue("q")
	page, _ := strconv.Atoi(req.FormValue("p"))
	pageSize := 15

	result, err := s.db.Search(query, page*pageSize, pageSize)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	ctx := struct {
		Query      string
		Results    []*Book
		Pagination *pagination
	}{
		Query:   query,
		Results: result.Results,
		Pagination: &pagination{
			PageSize: pageSize,
			Page:     page,
			Total:    result.NumResults,
		},
	}
	render("search.html", w, &ctx)
}

type autocompleteResult struct {
	// Id has to be a string since Javascript can't reliably
	// represent a uint64 (due to its usage of floating point
	// for all numbers).
	Id    string `json:"book_id"`
	Label string `json:"label"`
}

109
func (s *uiServer) handleSuggest(w http.ResponseWriter, req *http.Request) {
ale's avatar
ale committed
110 111 112 113 114 115
	term := req.FormValue("term")
	if term == "" {
		http.Error(w, "No Query", http.StatusBadRequest)
		return
	}

116
	result, err := s.db.Suggest(term)
ale's avatar
ale committed
117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	var out []autocompleteResult
	for _, book := range result.Results {
		out = append(out, autocompleteResult{
			Id:    book.Id.String(),
			Label: book.Metadata.String(),
		})
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(out)
}

func (s *uiServer) withBook(f func(*Book, http.ResponseWriter, *http.Request)) http.HandlerFunc {
	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
		vars := mux.Vars(req)
		bookid := ParseID(vars["id"])
		if bookid == 0 {
			http.Error(w, "Bad ID", http.StatusBadRequest)
			return
		}
		book, err := s.db.GetBook(bookid)
		if err != nil {
			http.NotFound(w, req)
			return
		}
		f(book, w, req)
	})
}

151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
func (s *uiServer) withFile(f func(*Book, *File, int, http.ResponseWriter, *http.Request)) http.HandlerFunc {
	return s.withBook(func(book *Book, w http.ResponseWriter, req *http.Request) {
		vars := mux.Vars(req)
		fileIndex, err := strconv.Atoi(vars["fid"])
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		files, err := s.db.GetBookFiles(book.Id)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		if fileIndex < 0 || fileIndex >= len(files) {
			http.NotFound(w, req)
			return
		}

		f(book, files[fileIndex], fileIndex, w, req)
	})
}

func findEpub(files []*File) int {
	for i, f := range files {
		if f.FileType == ".epub" {
			return i
		}
	}
	return -1
}

ale's avatar
ale committed
183
func (s *uiServer) handleShowBook(book *Book, w http.ResponseWriter, req *http.Request) {
ale's avatar
ale committed
184 185 186 187 188 189 190
	files, err := s.db.GetBookFiles(book.Id)
	if err != nil {
		log.Printf("ShowBook(%d): %v", book.Id, err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

191 192 193
	// Only offer the online reader if we have an EPUB file.
	epubIndex := findEpub(files)

194 195
	// The book's Description, if present, should be rendered
	// directly as HTML. So we deal with it separately.
ale's avatar
ale committed
196
	ctx := struct {
197 198 199 200
		Query       string
		Book        *Book
		Files       []*File
		Description template.HTML
201 202
		HasEpub     bool
		EpubIndex   int
203 204 205 206
	}{
		Book:        book,
		Files:       files,
		Description: template.HTML(book.Metadata.Description),
207 208
		HasEpub:     (epubIndex >= 0),
		EpubIndex:   epubIndex,
209
	}
ale's avatar
ale committed
210 211 212
	render("book.html", w, &ctx)
}

213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
func (s *uiServer) handleReadBook(book *Book, file *File, fileIndex int, w http.ResponseWriter, req *http.Request) {
	if file.FileType != ".epub" {
		http.NotFound(w, req)
		return
	}

	ctx := struct {
		Book      *Book
		File      *File
		FileIndex int
	}{
		Book:      book,
		File:      file,
		FileIndex: fileIndex,
	}
	render("reader.html", w, &ctx)
}

ale's avatar
ale committed
231 232 233 234 235 236
var contentTypeMap = map[string]string{
	".epub": "application/epub+zip",
	".mobi": "application/octet-stream",
	".pdf":  "application/pdf",
}

237
func (s *uiServer) handleDownloadBook(book *Book, file *File, fileIndex int, w http.ResponseWriter, req *http.Request) {
ale's avatar
ale committed
238
	f, err := s.storage.Open(file.Path)
ale's avatar
ale committed
239 240 241 242 243 244 245
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer f.Close()

	w.Header().Set("ETag", book.Id.String())
ale's avatar
ale committed
246 247
	w.Header().Set("Content-Type", contentTypeMap[file.FileType])
	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%d%s\"", book.Id, file.FileType))
ale's avatar
ale committed
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269

	http.ServeContent(w, req, "", time.Time{}, f)
}

func (s *uiServer) handleShowCover(book *Book, w http.ResponseWriter, req *http.Request) {
	if book.CoverPath == "" {
		http.NotFound(w, req)
		return
	}

	f, err := s.storage.Open(book.CoverPath)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer f.Close()

	w.Header().Set("ETag", "C"+book.Id.String())
	w.Header().Set("Cache-Control", "public")
	http.ServeContent(w, req, "", time.Time{}, f)
}

270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
var thumbnailSize uint = 150

func makeThumbnail(inputfile string) ([]byte, error) {
	file, err := os.Open(inputfile)
	if err != nil {
		return nil, err
	}
	defer file.Close()
	img, _, err := image.Decode(file)
	if err != nil {
		return nil, err
	}

	thumb := resize.Thumbnail(thumbnailSize, thumbnailSize, img, resize.Lanczos2)
	var buf bytes.Buffer
	if err := jpeg.Encode(&buf, thumb, &jpeg.Options{Quality: 65}); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}
ale's avatar
ale committed
290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314

func (s *uiServer) handleShowThumbnail(book *Book, w http.ResponseWriter, req *http.Request) {
	if book.CoverPath == "" {
		http.NotFound(w, req)
		return
	}

	w.Header().Set("Cache-Control", "public")

	cachedPath := s.cache.Path(fmt.Sprintf("%d.thumb.jpg", book.Id))
	if cachedFile, err := s.cache.Open(cachedPath); err == nil {
		// Thumbnail is cached.
		defer cachedFile.Close()
		w.Header().Set("ETag", "T"+book.Id.String())
		http.ServeContent(w, req, "", time.Time{}, cachedFile)
		return
	}

	cachedFile, err := s.cache.Create(cachedPath)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer cachedFile.Close()

315
	data, err := makeThumbnail(s.storage.Abs(book.CoverPath))
ale's avatar
ale committed
316 317 318 319 320 321 322 323 324 325 326 327
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "image/jpeg")
	w.Header().Set("Content-Length", strconv.Itoa(len(data)))
	w.Header().Set("ETag", "T"+book.Id.String())
	cachedFile.Write(data)
	w.Write(data)
}

328 329 330 331 332 333 334 335 336 337 338 339 340
func (s *uiServer) handleDumpDatabase(w http.ResponseWriter, req *http.Request) {
	// Only allow requests from localhost.
	host, _, _ := net.SplitHostPort(req.RemoteAddr)
	ip := net.ParseIP(host)
	if !ip.IsLoopback() {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	w.Header().Set("Content-Type", "application/octet-stream")
	s.db.Dump(w)
}

ale's avatar
ale committed
341 342 343 344 345 346 347 348 349 350 351 352 353
func (s *uiServer) handleHome(w http.ResponseWriter, req *http.Request) {
	render("index.html", w, nil)
}

func render(templateName string, w http.ResponseWriter, ctx interface{}) {
	var buf bytes.Buffer
	if err := tpl.ExecuteTemplate(&buf, templateName, ctx); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	io.Copy(w, &buf)
}

ale's avatar
ale committed
354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
func fullURL(req *http.Request) *url.URL {
	u := *req.URL
	u.Host = req.Host
	if req.TLS != nil || req.Header.Get("X-Forwarded-Proto") == "https" {
		u.Scheme = "https"
	} else {
		u.Scheme = "http"
	}
	return &u
}

func handleOpenSearchXml(w http.ResponseWriter, req *http.Request) {
	searchURL := fullURL(req)
	searchURL.Path = "/search"
	searchURL.RawQuery = "q={searchTerms}&pw={startPage}"
	ctx := struct {
		URL string
	}{searchURL.String()}
	w.Header().Set("Content-Type", "application/opensearchdescription+xml")
	render("opensearch_xml.html", w, &ctx)
}

376
func NewHttpServer(db *Database, storage, cache *RWFileStorage, addr string) *http.Server {
ale's avatar
ale committed
377 378 379 380 381 382 383 384 385
	var err error
	tpl, err = template.New("liber").Funcs(template.FuncMap{
		"join": strings.Join,
	}).ParseGlob(filepath.Join(*htdocsDir, "templates", "*.html"))
	if err != nil {
		log.Fatal(err)
	}

	syncsrv := &syncServer{db, storage}
ale's avatar
ale committed
386
	uisrv := &uiServer{db, storage, cache}
ale's avatar
ale committed
387 388 389 390 391 392

	r := mux.NewRouter()
	r.Handle("/static/{path:.*}", http.StripPrefix("/static/",
		http.FileServer(http.Dir(filepath.Join(*htdocsDir, "static")))))
	r.HandleFunc("/api/sync/upload", syncsrv.handleSyncUpload).Methods("POST")
	r.HandleFunc("/api/sync/diff", syncsrv.handleDiffRequest).Methods("POST")
393
	r.HandleFunc("/internal/dump_db", uisrv.handleDumpDatabase)
ale's avatar
ale committed
394
	r.Handle("/book/cover/{id:[0-9]+}", uisrv.withBook(uisrv.handleShowCover))
ale's avatar
ale committed
395
	r.Handle("/book/thumb/{id:[0-9]+}", uisrv.withBook(uisrv.handleShowThumbnail))
ale's avatar
ale committed
396
	r.Handle("/book/{id:[0-9]+}", uisrv.withBook(uisrv.handleShowBook))
397 398
	r.Handle("/read/{id:[0-9]+}/{fid:[0-9]+}", uisrv.withFile(uisrv.handleReadBook))
	r.Handle("/dl/{id:[0-9]+}/{fid:[0-9]+}", uisrv.withFile(uisrv.handleDownloadBook))
ale's avatar
ale committed
399
	r.HandleFunc("/opensearch.xml", handleOpenSearchXml)
400
	r.HandleFunc("/suggest", uisrv.handleSuggest)
ale's avatar
ale committed
401 402 403 404 405 406 407 408
	r.HandleFunc("/search", uisrv.handleSearch)
	r.HandleFunc("/", uisrv.handleHome)

	return &http.Server{
		Addr:    addr,
		Handler: r,
	}
}