1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
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
109
110
111
112
113
114
115
116
117
118
119
120
121
|
package handlers
import (
"bytes"
"encoding/base64"
"encoding/json"
"image"
_ "image/gif"
_ "image/jpeg"
"image/png"
"strconv"
"golang.org/x/image/draw"
"net/http"
"server/database"
"server/helper"
)
const thumbnail_size = 128
func makeThumbnail(source image.Image) ([]byte, error) {
dest := image.NewRGBA(image.Rect(0, 0, thumbnail_size, thumbnail_size))
draw.NearestNeighbor.Scale(dest, dest.Rect, source, source.Bounds(), draw.Over, nil)
var buffer bytes.Buffer
err := png.Encode(&buffer, dest)
if err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
type postRequest struct {
Title string
Contents string
Subreact string
File string
}
type postResponse struct {
Uid int `json:"uid"`
}
func Post(writer http.ResponseWriter, request *http.Request) {
if request.Method != "POST" {
helper.WriteErrorJson("expected GET method", writer, http.StatusBadRequest)
return
}
claims := helper.GetValidClaims(writer, request)
if claims == nil {
return
}
user_uid, err := strconv.Atoi(claims.Subject) // TODO UID
if err != nil {
helper.WriteInternalErrorJson(err, writer)
return
}
var post_request postRequest
err = json.NewDecoder(request.Body).Decode(&post_request)
if err != nil {
helper.WriteErrorJson(err.Error(), writer, http.StatusBadRequest)
return
}
post_request.Title = helper.CleanTitle(post_request.Title)
if !helper.IsValidRange(post_request.Title, "title", 8, 128, writer) {
return
}
post_request.Contents = helper.CleanContents(post_request.Contents)
if !helper.IsValidRange(post_request.Contents, "contents", 8, 2048, writer) {
return
}
if !helper.IsValidSubreact(post_request.Subreact, writer) {
return
}
image_blob, err := base64.StdEncoding.DecodeString(post_request.File)
if err != nil {
helper.WriteErrorJson("failed to decode image from base64", writer, http.StatusBadRequest)
return
}
image, format, err := image.Decode(bytes.NewReader(image_blob))
if err != nil {
helper.WriteErrorJson("failed to decode image", writer, http.StatusBadRequest)
return
}
if !helper.IsImageSupported(image, format, writer) {
return
}
thumbnail_blob, err := makeThumbnail(image)
if err != nil {
helper.WriteInternalErrorJson(err, writer)
return
}
image_uid, err := database.WritePost(user_uid,
nil,
post_request.Title,
post_request.Contents,
post_request.Subreact,
image_blob,
thumbnail_blob)
if err != nil {
helper.WriteInternalErrorJson(err, writer)
return
}
resp, err := json.Marshal(postResponse{Uid: image_uid})
if err != nil {
helper.WriteInternalErrorJson(err, writer)
return
}
writer.Write(resp)
}
|
