linx-server/display.go

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package main
import (
"encoding/json"
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"io/ioutil"
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"net/http"
"os"
"path"
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"path/filepath"
"strconv"
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"strings"
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"time"
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"bitbucket.org/taruti/mimemagic"
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"github.com/dustin/go-humanize"
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"github.com/flosch/pongo2"
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"github.com/microcosm-cc/bluemonday"
"github.com/russross/blackfriday"
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"github.com/zenazn/goji/web"
)
const maxDisplayFileSizeBytes = 1024 * 512
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func fileDisplayHandler(c web.C, w http.ResponseWriter, r *http.Request) {
fileName := c.URLParams["name"]
filePath := path.Join(Config.filesDir, fileName)
fileInfo, err := os.Stat(filePath)
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if !fileExistsAndNotExpired(fileName) {
notFoundHandler(c, w, r)
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return
}
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expiry, _ := metadataGetExpiry(fileName)
var expiryHuman string
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if expiry != neverExpire {
expiryHuman = humanize.RelTime(time.Now(), expiry, "", "")
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}
sizeHuman := humanize.Bytes(uint64(fileInfo.Size()))
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extra := make(map[string]string)
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file, _ := os.Open(filePath)
header := make([]byte, 512)
file.Read(header)
file.Close()
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mimetype := mimemagic.Match("", header)
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extension := strings.TrimPrefix(filepath.Ext(fileName), ".")
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if strings.EqualFold("application/json", r.Header.Get("Accept")) {
js, _ := json.Marshal(map[string]string{
"filename": fileName,
"mimetype": mimetype,
"expiry": strconv.FormatInt(expiry.Unix(), 10),
"size": strconv.FormatInt(fileInfo.Size(), 10),
})
w.Write(js)
return
}
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var tpl *pongo2.Template
if strings.HasPrefix(mimetype, "image/") {
tpl = Templates["display/image.html"]
} else if strings.HasPrefix(mimetype, "video/") {
tpl = Templates["display/video.html"]
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} else if strings.HasPrefix(mimetype, "audio/") {
tpl = Templates["display/audio.html"]
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} else if mimetype == "application/pdf" {
tpl = Templates["display/pdf.html"]
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} else if supportedBinExtension(extension) {
if fileInfo.Size() < maxDisplayFileSizeBytes {
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bytes, err := ioutil.ReadFile(filePath)
if err != nil {
tpl = Templates["display/file.html"]
} else {
extra["extension"] = extension
extra["lang_hl"], extra["lang_ace"] = extensionToHlAndAceLangs(extension)
extra["contents"] = string(bytes)
tpl = Templates["display/bin.html"]
}
} else {
tpl = Templates["display/file.html"]
}
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} else if extension == "md" {
if fileInfo.Size() < maxDisplayFileSizeBytes {
bytes, err := ioutil.ReadFile(filePath)
if err != nil {
tpl = Templates["display/file.html"]
} else {
unsafe := blackfriday.MarkdownCommon(bytes)
html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
extra["contents"] = string(html)
tpl = Templates["display/md.html"]
}
} else {
tpl = Templates["display/file.html"]
}
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} else {
tpl = Templates["display/file.html"]
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}
err = tpl.ExecuteWriter(pongo2.Context{
"mime": mimetype,
"filename": fileName,
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"size": sizeHuman,
"expiry": expiryHuman,
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"extra": extra,
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}, w)
if err != nil {
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oopsHandler(c, w, r, RespHTML, "")
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}
}