/
storage.go
110 lines (92 loc) · 2.46 KB
/
storage.go
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package storage
import (
"html/template"
"io"
"net/http"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/appengine"
"google.golang.org/appengine/urlfetch"
"google.golang.org/cloud"
"google.golang.org/cloud/storage"
)
const (
bucket = "golang-bootcamp"
prefix = "Oralordos/"
)
func init() {
http.HandleFunc("/put", handlePut)
http.HandleFunc("/get", handleGet)
http.HandleFunc("/", handleList)
}
func getCloudContext(ctx context.Context) context.Context {
hc := &http.Client{
Transport: &oauth2.Transport{
Source: google.AppEngineTokenSource(ctx, storage.ScopeFullControl),
Base: &urlfetch.Transport{Context: ctx},
},
}
return cloud.NewContext(appengine.AppID(ctx), hc)
}
func handlePut(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
cctx := getCloudContext(ctx)
if req.Method != "POST" {
http.Error(res, "Must send a file", http.StatusMethodNotAllowed)
return
}
file, hdr, err := req.FormFile("f")
if err != nil {
http.Error(res, err.Error(), 500)
return
}
filename := hdr.Filename
writer := storage.NewWriter(cctx, bucket, prefix+filename)
io.Copy(writer, file)
err = writer.Close()
if err != nil {
http.Error(res, "ERROR WRITING TO BUCKET: "+err.Error(), 500)
return
}
http.Redirect(res, req, "/", http.StatusSeeOther)
}
func handleGet(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
cctx := getCloudContext(ctx)
filename := req.FormValue("f")
rdr, err := storage.NewReader(cctx, bucket, prefix+filename)
if err != nil {
http.Error(res, err.Error(), 500)
return
}
defer rdr.Close()
io.Copy(res, rdr)
}
func handleList(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
cctx := getCloudContext(ctx)
query := &storage.Query{
Prefix: prefix,
}
objs, err := storage.ListObjects(cctx, bucket, query)
if err != nil {
http.Error(res, err.Error(), 500)
return
}
t, err := template.New("").Parse(`<li><a href="/get?f={{.}}">{{.}}</a></li>`)
if err != nil {
http.Error(res, err.Error(), 500)
return
}
res.Header().Set("Content-Type", "text/html")
io.WriteString(res, `<form action="put" method="POST" enctype="multipart/form-data"><input name="f" type="file"><input type="submit"></form> <ul>`)
for _, obj := range objs.Results {
err := t.Execute(res, obj.Name[len(prefix):])
if err != nil {
http.Error(res, err.Error(), 500)
return
}
}
io.WriteString(res, `</ul>`)
}