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upload.go
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upload.go
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package server
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
"text/template"
"github.com/gomodule/redigo/redis"
)
//generateManifest(rawData []byte) Manifest:
// Generates manifest for given []byte and stores in a Manifest struct
// Mime type is detected using http.DetectContentType which guesses the type based on the
// first 500 bytes of the provided by rawData.
// SHA256 hash is generated for rawData and stored in hex.
func generateManifest(rawData []byte) Manifest {
var m Manifest
m.Size = len(rawData)
h := sha256.New()
h.Write(rawData)
m.Cids.SHA256 = hex.EncodeToString(h.Sum(nil))
m.Mime = http.DetectContentType(rawData)
return m
}
//insertHash(m Manifest, raw []byte, c redis.Conn) error
// Inserts a hash into redis with fields json: Manifest, raw: []byte
func insertHash(m Manifest, raw []byte, c redis.Conn) error {
//Create json string by marshaling Manifest
jsonData, err := m.ToJSON()
if err != nil {
return err
}
_, err = c.Do("HMSET", m.Cids.SHA256, "json", string(jsonData), "raw", raw)
if err != nil {
return errors.New("Failed to insert" + m.Cids.SHA256)
}
return nil
}
func insertJSON(j []byte, c redis.Conn) (string, error) {
//Create json string by marshaling Manifest
var m Manifest
json.Unmarshal(j, &m)
_, err := c.Do("HSET", m.Cids.SHA256, "json", string(j))
if err != nil {
return "", errors.New("Failed to insert" + m.Cids.SHA256)
}
fmt.Println(m.Cids.SHA256 + " inserted\n")
return m.Cids.SHA256, nil
}
//func validJSON(in []byte)
// Checks that a []byte is a json and if its fields are valid
func validJSON(in []byte) error {
var m map[string]interface{}
if err := json.Unmarshal(in, &m); err != nil {
return errors.New("Input is not JSON")
}
if m["cids"] == nil {
return errors.New("JSON does not include cids field")
}
return nil
}
//SendLocalFiles (targetURL string, path string) error:
// Sends all file(s) to /upload endpoint through a single POST request.
// All files are wrapped in a formfile which are contained in a multipart form.
func SendLocalFiles(targetURL string, path string) error {
//Check that path is valid
fileStat, err := os.Stat(path)
if err != nil {
return err
}
//Create multipart form and then write all files specified in the path to it
bodyBuf := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuf)
switch {
case fileStat.IsDir():
files, err := ioutil.ReadDir(path)
if err != nil {
return errors.New("Unable to read " + path)
}
for _, fi := range files {
filePath := path + fi.Name()
fh, err := os.Open(filePath)
if err != nil {
return errors.New("Error opening file at: " + filePath)
}
fileWriter, err := bodyWriter.CreateFormFile("files", filePath)
if err != nil {
return errors.New("Error writing to buffer " + filePath)
}
_, err = io.Copy(fileWriter, fh)
if err != nil {
return err
}
}
default:
fileWriter, err := bodyWriter.CreateFormFile("files", path)
if err != nil {
return errors.New("Error writing to buffer " + path)
}
fh, err := os.Open(path)
if err != nil {
return errors.New("Error opening file at: " + path)
}
_, err = io.Copy(fileWriter, fh)
if err != nil {
return err
}
}
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
resp, err := http.Post(targetURL, contentType, bodyBuf)
if err != nil {
return err
}
defer resp.Body.Close()
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
fmt.Println(resp.Status)
fmt.Println(string(respBody))
return nil
}
//func upload(w http.ResponseWriter, r *http.Request)
// Uploads all files in the multipartform provided in a POST request
func upload(w http.ResponseWriter, r *http.Request) {
switch method := r.Method; method {
case "GET":
//GUI interface for optionally uploading files through the browser
t, err := template.ParseFiles("./templates/upload.gtpl")
if err != nil {
http.Error(w, "Cannot parse template", 500)
return
}
t.Execute(w, nil)
case "POST":
r.ParseMultipartForm(32 << 20) // 32MB is the default used by FormFile
fhs := r.MultipartForm.File["files"]
buf := bytes.NewBuffer(nil)
for _, fh := range fhs {
file, err := fh.Open()
if err != nil {
http.Error(w, "Failed to read file", 500)
return
}
_, err = io.Copy(buf, file)
if err != nil {
http.Error(w, "error writing to buffer", 500)
return
}
conn := redisPool.Get()
defer conn.Close()
if err := ping(conn); err != nil {
http.Error(w, "Can't connect to redis", 500)
return
}
//Generates manifest of the uploaded file and inserts it into redis db
m := generateManifest(buf.Bytes())
err = insertHash(m, buf.Bytes(), conn)
if err != nil {
http.Error(w, "failed to set key in redis", 500)
return
}
serialized, _ := m.ToJSON()
w.Write(serialized)
}
default:
fmt.Fprintf(w, "Method %s not supported", method)
}
}
//func uploadJSON(w http.ResponseWriter, r *http.Request)
// Uploads all files in the multipartform provided in a POST request
func uploadJSON(w http.ResponseWriter, r *http.Request) {
switch method := r.Method; method {
case "GET":
//GUI interface for optionally uploading files through the browser
t, err := template.ParseFiles("./templates/uploadJSON.gtpl")
if err != nil {
http.Error(w, "Cannot parse template", 500)
return
}
t.Execute(w, nil)
case "POST":
r.ParseMultipartForm(32 << 20) // 32MB is the default used by FormFile
fhs := r.MultipartForm.File["files"]
buf := bytes.NewBuffer(nil)
for _, fh := range fhs {
file, err := fh.Open()
if err != nil {
http.Error(w, "Failed to read file", 500)
return
}
_, err = io.Copy(buf, file)
if err != nil {
http.Error(w, "error writing to buffer", 500)
return
}
conn := redisPool.Get()
defer conn.Close()
if err := ping(conn); err != nil {
http.Error(w, "Can't connect to redis", 500)
return
}
//Generates manifest of the uploaded file and inserts it into redis db
if err := validJSON(buf.Bytes()); err != nil {
http.Error(w, err.Error(), 500)
return
}
hash, err := insertJSON(buf.Bytes(), conn)
if err != nil {
http.Error(w, err.Error(), 500)
}
fmt.Fprint(w, hash+" inserted\n")
buf.Reset()
}
default:
fmt.Fprintf(w, "Method %s not supported", method)
}
}