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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | espaco | 1 | /* |
| 2 | * jQuery File Upload Plugin GAE Go Example 3.2.0 |
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| 3 | * https://github.com/blueimp/jQuery-File-Upload |
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| 4 | * |
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| 5 | * Copyright 2011, Sebastian Tschan |
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| 6 | * https://blueimp.net |
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| 7 | * |
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| 8 | * Licensed under the MIT license: |
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| 9 | * http://www.opensource.org/licenses/MIT |
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| 10 | */ |
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| 11 | |||
| 12 | package app |
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| 13 | |||
| 14 | import ( |
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| 15 | "appengine" |
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| 16 | "appengine/blobstore" |
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| 17 | "appengine/image" |
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| 18 | "appengine/taskqueue" |
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| 19 | "bytes" |
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| 20 | "encoding/json" |
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| 21 | "fmt" |
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| 22 | "io" |
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| 23 | "log" |
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| 24 | "mime/multipart" |
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| 25 | "net/http" |
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| 26 | "net/url" |
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| 27 | "regexp" |
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| 28 | "strings" |
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| 29 | "time" |
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| 30 | ) |
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| 31 | |||
| 32 | const ( |
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| 33 | WEBSITE = "https://blueimp.github.io/jQuery-File-Upload/" |
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| 34 | MIN_FILE_SIZE = 1 // bytes |
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| 35 | MAX_FILE_SIZE = 5000000 // bytes |
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| 36 | IMAGE_TYPES = "image/(gif|p?jpeg|(x-)?png)" |
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| 37 | ACCEPT_FILE_TYPES = IMAGE_TYPES |
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| 38 | EXPIRATION_TIME = 300 // seconds |
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| 39 | THUMBNAIL_PARAM = "=s80" |
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| 40 | ) |
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| 41 | |||
| 42 | var ( |
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| 43 | imageTypes = regexp.MustCompile(IMAGE_TYPES) |
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| 44 | acceptFileTypes = regexp.MustCompile(ACCEPT_FILE_TYPES) |
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| 45 | ) |
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| 46 | |||
| 47 | type FileInfo struct { |
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| 48 | Key appengine.BlobKey `json:"-"` |
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| 49 | Url string `json:"url,omitempty"` |
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| 50 | ThumbnailUrl string `json:"thumbnailUrl,omitempty"` |
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| 51 | Name string `json:"name"` |
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| 52 | Type string `json:"type"` |
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| 53 | Size int64 `json:"size"` |
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| 54 | Error string `json:"error,omitempty"` |
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| 55 | DeleteUrl string `json:"deleteUrl,omitempty"` |
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| 56 | DeleteType string `json:"deleteType,omitempty"` |
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| 57 | } |
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| 58 | |||
| 59 | func (fi *FileInfo) ValidateType() (valid bool) { |
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| 60 | if acceptFileTypes.MatchString(fi.Type) { |
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| 61 | return true |
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| 62 | } |
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| 63 | fi.Error = "Filetype not allowed" |
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| 64 | return false |
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| 65 | } |
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| 66 | |||
| 67 | func (fi *FileInfo) ValidateSize() (valid bool) { |
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| 68 | if fi.Size < MIN_FILE_SIZE { |
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| 69 | fi.Error = "File is too small" |
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| 70 | } else if fi.Size > MAX_FILE_SIZE { |
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| 71 | fi.Error = "File is too big" |
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| 72 | } else { |
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| 73 | return true |
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| 74 | } |
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| 75 | return false |
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| 76 | } |
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| 77 | |||
| 78 | func (fi *FileInfo) CreateUrls(r *http.Request, c appengine.Context) { |
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| 79 | u := &url.URL{ |
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| 80 | Scheme: r.URL.Scheme, |
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| 81 | Host: appengine.DefaultVersionHostname(c), |
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| 82 | Path: "/", |
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| 83 | } |
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| 84 | uString := u.String() |
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| 85 | fi.Url = uString + escape(string(fi.Key)) + "/" + |
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| 86 | escape(string(fi.Name)) |
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| 87 | fi.DeleteUrl = fi.Url + "?delete=true" |
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| 88 | fi.DeleteType = "DELETE" |
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| 89 | if imageTypes.MatchString(fi.Type) { |
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| 90 | servingUrl, err := image.ServingURL( |
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| 91 | c, |
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| 92 | fi.Key, |
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| 93 | &image.ServingURLOptions{ |
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| 94 | Secure: strings.HasSuffix(u.Scheme, "s"), |
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| 95 | Size: 0, |
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| 96 | Crop: false, |
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| 97 | }, |
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| 98 | ) |
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| 99 | check(err) |
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| 100 | fi.ThumbnailUrl = servingUrl.String() + THUMBNAIL_PARAM |
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| 101 | } |
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| 102 | } |
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| 103 | |||
| 104 | func check(err error) { |
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| 105 | if err != nil { |
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| 106 | panic(err) |
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| 107 | } |
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| 108 | } |
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| 109 | |||
| 110 | func escape(s string) string { |
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| 111 | return strings.Replace(url.QueryEscape(s), "+", "%20", -1) |
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| 112 | } |
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| 113 | |||
| 114 | func delayedDelete(c appengine.Context, fi *FileInfo) { |
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| 115 | if key := string(fi.Key); key != "" { |
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| 116 | task := &taskqueue.Task{ |
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| 117 | Path: "/" + escape(key) + "/-", |
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| 118 | Method: "DELETE", |
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| 119 | Delay: time.Duration(EXPIRATION_TIME) * time.Second, |
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| 120 | } |
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| 121 | taskqueue.Add(c, task, "") |
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| 122 | } |
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| 123 | } |
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| 124 | |||
| 125 | func handleUpload(r *http.Request, p *multipart.Part) (fi *FileInfo) { |
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| 126 | fi = &FileInfo{ |
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| 127 | Name: p.FileName(), |
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| 128 | Type: p.Header.Get("Content-Type"), |
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| 129 | } |
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| 130 | if !fi.ValidateType() { |
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| 131 | return |
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| 132 | } |
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| 133 | defer func() { |
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| 134 | if rec := recover(); rec != nil { |
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| 135 | log.Println(rec) |
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| 136 | fi.Error = rec.(error).Error() |
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| 137 | } |
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| 138 | }() |
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| 139 | lr := &io.LimitedReader{R: p, N: MAX_FILE_SIZE + 1} |
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| 140 | context := appengine.NewContext(r) |
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| 141 | w, err := blobstore.Create(context, fi.Type) |
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| 142 | defer func() { |
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| 143 | w.Close() |
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| 144 | fi.Size = MAX_FILE_SIZE + 1 - lr.N |
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| 145 | fi.Key, err = w.Key() |
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| 146 | check(err) |
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| 147 | if !fi.ValidateSize() { |
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| 148 | err := blobstore.Delete(context, fi.Key) |
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| 149 | check(err) |
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| 150 | return |
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| 151 | } |
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| 152 | delayedDelete(context, fi) |
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| 153 | fi.CreateUrls(r, context) |
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| 154 | }() |
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| 155 | check(err) |
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| 156 | _, err = io.Copy(w, lr) |
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| 157 | return |
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| 158 | } |
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| 159 | |||
| 160 | func getFormValue(p *multipart.Part) string { |
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| 161 | var b bytes.Buffer |
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| 162 | io.CopyN(&b, p, int64(1<<20)) // Copy max: 1 MiB |
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| 163 | return b.String() |
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| 164 | } |
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| 165 | |||
| 166 | func handleUploads(r *http.Request) (fileInfos []*FileInfo) { |
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| 167 | fileInfos = make([]*FileInfo, 0) |
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| 168 | mr, err := r.MultipartReader() |
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| 169 | check(err) |
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| 170 | r.Form, err = url.ParseQuery(r.URL.RawQuery) |
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| 171 | check(err) |
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| 172 | part, err := mr.NextPart() |
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| 173 | for err == nil { |
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| 174 | if name := part.FormName(); name != "" { |
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| 175 | if part.FileName() != "" { |
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| 176 | fileInfos = append(fileInfos, handleUpload(r, part)) |
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| 177 | } else { |
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| 178 | r.Form[name] = append(r.Form[name], getFormValue(part)) |
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| 179 | } |
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| 180 | } |
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| 181 | part, err = mr.NextPart() |
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| 182 | } |
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| 183 | return |
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| 184 | } |
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| 185 | |||
| 186 | func get(w http.ResponseWriter, r *http.Request) { |
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| 187 | if r.URL.Path == "/" { |
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| 188 | http.Redirect(w, r, WEBSITE, http.StatusFound) |
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| 189 | return |
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| 190 | } |
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| 191 | parts := strings.Split(r.URL.Path, "/") |
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| 192 | if len(parts) == 3 { |
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| 193 | if key := parts[1]; key != "" { |
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| 194 | blobKey := appengine.BlobKey(key) |
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| 195 | bi, err := blobstore.Stat(appengine.NewContext(r), blobKey) |
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| 196 | if err == nil { |
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| 197 | w.Header().Add("X-Content-Type-Options", "nosniff") |
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| 198 | if !imageTypes.MatchString(bi.ContentType) { |
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| 199 | w.Header().Add("Content-Type", "application/octet-stream") |
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| 200 | w.Header().Add( |
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| 201 | "Content-Disposition", |
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| 202 | fmt.Sprintf("attachment; filename=\"%s\"", parts[2]), |
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| 203 | ) |
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| 204 | } |
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| 205 | w.Header().Add( |
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| 206 | "Cache-Control", |
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| 207 | fmt.Sprintf("public,max-age=%d", EXPIRATION_TIME), |
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| 208 | ) |
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| 209 | blobstore.Send(w, blobKey) |
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| 210 | return |
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| 211 | } |
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| 212 | } |
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| 213 | } |
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| 214 | http.Error(w, "404 Not Found", http.StatusNotFound) |
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| 215 | } |
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| 216 | |||
| 217 | func post(w http.ResponseWriter, r *http.Request) { |
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| 218 | result := make(map[string][]*FileInfo, 1) |
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| 219 | result["files"] = handleUploads(r) |
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| 220 | b, err := json.Marshal(result) |
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| 221 | check(err) |
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| 222 | if redirect := r.FormValue("redirect"); redirect != "" { |
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| 223 | if strings.Contains(redirect, "%s") { |
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| 224 | redirect = fmt.Sprintf( |
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| 225 | redirect, |
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| 226 | escape(string(b)), |
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| 227 | ) |
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| 228 | } |
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| 229 | http.Redirect(w, r, redirect, http.StatusFound) |
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| 230 | return |
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| 231 | } |
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| 232 | w.Header().Set("Cache-Control", "no-cache") |
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| 233 | jsonType := "application/json" |
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| 234 | if strings.Index(r.Header.Get("Accept"), jsonType) != -1 { |
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| 235 | w.Header().Set("Content-Type", jsonType) |
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| 236 | } |
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| 237 | fmt.Fprintln(w, string(b)) |
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| 238 | } |
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| 239 | |||
| 240 | func delete(w http.ResponseWriter, r *http.Request) { |
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| 241 | parts := strings.Split(r.URL.Path, "/") |
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| 242 | if len(parts) != 3 { |
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| 243 | return |
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| 244 | } |
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| 245 | result := make(map[string]bool, 1) |
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| 246 | if key := parts[1]; key != "" { |
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| 247 | c := appengine.NewContext(r) |
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| 248 | blobKey := appengine.BlobKey(key) |
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| 249 | err := blobstore.Delete(c, blobKey) |
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| 250 | check(err) |
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| 251 | err = image.DeleteServingURL(c, blobKey) |
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| 252 | check(err) |
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| 253 | result[key] = true |
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| 254 | } |
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| 255 | jsonType := "application/json" |
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| 256 | if strings.Index(r.Header.Get("Accept"), jsonType) != -1 { |
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| 257 | w.Header().Set("Content-Type", jsonType) |
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| 258 | } |
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| 259 | b, err := json.Marshal(result) |
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| 260 | check(err) |
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| 261 | fmt.Fprintln(w, string(b)) |
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| 262 | } |
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| 263 | |||
| 264 | func handle(w http.ResponseWriter, r *http.Request) { |
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| 265 | params, err := url.ParseQuery(r.URL.RawQuery) |
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| 266 | check(err) |
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| 267 | w.Header().Add("Access-Control-Allow-Origin", "*") |
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| 268 | w.Header().Add( |
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| 269 | "Access-Control-Allow-Methods", |
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| 270 | "OPTIONS, HEAD, GET, POST, PUT, DELETE", |
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| 271 | ) |
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| 272 | w.Header().Add( |
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| 273 | "Access-Control-Allow-Headers", |
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| 274 | "Content-Type, Content-Range, Content-Disposition", |
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| 275 | ) |
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| 276 | switch r.Method { |
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| 277 | case "OPTIONS": |
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| 278 | case "HEAD": |
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| 279 | case "GET": |
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| 280 | get(w, r) |
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| 281 | case "POST": |
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| 282 | if len(params["_method"]) > 0 && params["_method"][0] == "DELETE" { |
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| 283 | delete(w, r) |
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| 284 | } else { |
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| 285 | post(w, r) |
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| 286 | } |
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| 287 | case "DELETE": |
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| 288 | delete(w, r) |
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| 289 | default: |
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| 290 | http.Error(w, "501 Not Implemented", http.StatusNotImplemented) |
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| 291 | } |
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| 292 | } |
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| 293 | |||
| 294 | func init() { |
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| 295 | http.HandleFunc("/", handle) |
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| 296 | } |