CODEWITHSUNDEEP
xmlgohttphikvisionmimemultipart
lukerobbo
lukerobbo

Reputation: 121

Golang multipart.Reader Not detecting boundary

I am working on a project, where I need to get the events from a hikvision camera. Using the /ISAPI/Event/notification/alertStream endpoint. Which uses multipart/mixed over HTTP server push.

The issue I am having is when I try to io.ReadAll() or io.Copy() and the program just gets stuck. In wireshark I can see the stream of XML events coming in. So I tried scanner see below code. and print out line by line which it does including the --boundary. Which suggest the multipart Reader fails to detect the boundary. Thus the readPartData() never returns.

parser := multipart.NewReader(resp.Body, bod)

        for {
            log.Println("New Part")
            part, err := parser.NextPart()
            if err != nil {
                log.Println("NextRawPart:", err)
                continue
            }

            da, err := readPartData(part)
            if err != nil {
                log.Println(err)
                continue
            }

            log.Println(da)

            part.Close()
        }

func readPartData(part *multipart.Part) (string, error) {
    var buffer []byte
    scanner := bufio.NewScanner(part)
    for scanner.Scan() {
        line := scanner.Bytes()
        fmt.Println(string(line))
        buffer = append(buffer, line...)
        buffer = append(buffer, '\n')
    }

    if err := scanner.Err(); err != nil {
        return "", err
    }

    partData := string(buffer)
    return partData, nil
}

Multipart stream

HTTP/1.0 200 OK
MIME-Version: 1.0
Content-Type: multipart/mixed;boundary=boundary

--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 468

<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
<protocol>HTTP</protocol>
<channelID>0</channelID>
<dateTime>2023-09-07T10:10:15+10:00</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>
--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 468

<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
<protocol>HTTP</protocol>
<channelID>0</channelID>
<dateTime>2023-09-07T10:10:24+10:00</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>
--boundary
Content-Type: application/xml; charset="UTF-8"
Content-Length: 468

<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
<protocol>HTTP</protocol>
<channelID>0</channelID>
<dateTime>2023-09-07T10:10:34+10:00</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>

Is there something wrong with the boundary hikvision is sending, or am I doing something wrong? Any suggestions would be greatly appreciated.

Upvotes: 1

Views: 247

Answers (0)

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