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messages.go
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/
messages.go
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package screenshotr
import (
"bytes"
"fmt"
log "github.com/sirupsen/logrus"
"howett.net/plist"
)
type (
plistArray []interface{}
versionInfo struct {
major uint64
minor uint64
}
)
const (
dLMessageVersionExchange = "DLMessageVersionExchange"
dlMessageProcessMessage = "DLMessageProcessMessage"
)
func newVersionExchangeRequest(versionMajor uint64) plistArray {
return []interface{}{dLMessageVersionExchange, "DLVersionsOk", versionMajor}
}
func getArrayFromBytes(plistBytes []byte) (plistArray, error) {
decoder := plist.NewDecoder(bytes.NewReader(plistBytes))
var data plistArray
err := decoder.Decode(&data)
return data, err
}
func getVersionfromBytes(plistBytes []byte) (versionInfo, error) {
data, err := getArrayFromBytes(plistBytes)
if err != nil {
return versionInfo{}, fmt.Errorf("failed decoding bytes: %x to array with error %w", plistBytes, err)
}
if len(data) > 3 {
log.Warnf("expected 2 items in version exchange response, received %+v", data)
}
if len(data) < 3 {
return versionInfo{}, fmt.Errorf("expected 3 items in array, got: %+v", data)
}
typeName, ok := data[0].(string)
if !ok || typeName != dLMessageVersionExchange {
return versionInfo{},
fmt.Errorf("version response array should contain DLMessageVersionExchange but '%s'", typeName)
}
major, ok := data[1].(uint64)
if !ok {
return versionInfo{}, fmt.Errorf("could not extract major version")
}
minor, ok := data[2].(uint64)
if !ok {
return versionInfo{}, fmt.Errorf("could not extract minor version")
}
return versionInfo{major, minor}, nil
}
type screenShotRequest struct {
MessageType string
}
func newScreenShotRequest() plistArray {
request := make([]interface{}, 2)
request[0] = "DLMessageProcessMessage"
request[1] = screenShotRequest{"ScreenShotRequest"}
return request
}