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utils.go
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/
utils.go
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package utils
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/user"
"path/filepath"
"regexp"
"runtime"
"strconv"
"strings"
log "github.com/sirupsen/logrus"
)
// transforms the keys of a Map recursively with the given transform function
func TransformMapKeys(input map[string]interface{}, transformFunc func(string) string) map[string]interface{} {
output := make(map[string]interface{})
for k, v := range input {
transformedKey := transformFunc(k)
value, ok := v.(map[string]interface{})
if !ok {
output[transformedKey] = v
} else {
output[transformedKey] = TransformMapKeys(value, transformFunc)
}
}
return output
}
// unmarshal returns parses the JSON config data and stores the value in the reference to result
func Unmarshal(obj string, result interface{}) error {
obj = strings.TrimSpace(obj)
err := json.Unmarshal([]byte(obj), result)
if err != nil {
if e, ok := err.(*json.SyntaxError); ok {
return ErrUnmarshalSyntax(err, e.Offset)
}
if e, ok := err.(*json.UnmarshalTypeError); ok {
return ErrUnmarshalType(err, e.Value)
}
if e, ok := err.(*json.UnsupportedTypeError); ok {
return ErrUnmarshalUnsupportedType(err, e.Type)
}
if e, ok := err.(*json.UnsupportedValueError); ok {
return ErrUnmarshalUnsupportedValue(err, e.Value)
}
if e, ok := err.(*json.InvalidUnmarshalError); ok {
return ErrUnmarshalInvalid(err, e.Type)
}
return ErrUnmarshal(err)
}
return nil
}
// getBool function returns the boolean config data
func GetBool(key string) (bool, error) {
enabled, err := strconv.ParseBool(key)
if err != nil {
return false, ErrGetBool(key, err)
}
return enabled, nil
}
func StrConcat(s ...string) string {
var buf strings.Builder
for _, str := range s {
buf.WriteString(str)
}
return buf.String()
}
func Marshal(obj interface{}) (string, error) {
result, err := json.Marshal(obj)
if err != nil {
return " ", ErrMarshal(err)
}
return string(result), nil
}
func Filepath() string {
_, fn, line, _ := runtime.Caller(0)
return fmt.Sprintf("file: %s, line: %d", fn, line)
}
func DownloadFile(filepath string, url string) error {
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("failed to get the file %d status code for %s file", resp.StatusCode, url)
}
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
return err
}
// GetHome returns the home path
func GetHome() string {
usr, _ := user.Current()
return usr.HomeDir
}
// CreateFile creates a file with the given content on the given location with
// the given filename
func CreateFile(contents []byte, filename string, location string) error {
// Create file in -rw-r--r-- mode
fd, err := os.OpenFile(filepath.Join(location, filename), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return err
}
if _, err = fd.Write(contents); err != nil {
fd.Close()
return err
}
if err = fd.Close(); err != nil {
return err
}
return nil
}
// ReadFileSource supports "http", "https" and "file" protocols.
// it takes in the location as a uri and returns the contents of
// file as a string.
func ReadFileSource(uri string) (string, error) {
if strings.HasPrefix(uri, "http") {
return ReadRemoteFile(uri)
}
if strings.HasPrefix(uri, "file") {
return ReadLocalFile(uri)
}
return "", ErrInvalidProtocol
}
// ReadRemoteFile takes in the location of a remote file
// in the format 'http://location/of/file' or 'https://location/file'
// and returns the content of the file if the location is valid and
// no error occurs
func ReadRemoteFile(url string) (string, error) {
response, err := http.Get(url)
if err != nil {
return " ", err
}
if response.StatusCode == http.StatusNotFound {
return " ", ErrRemoteFileNotFound(url)
}
defer response.Body.Close()
buf := new(bytes.Buffer)
_, err = io.Copy(buf, response.Body)
if err != nil {
return " ", ErrReadingRemoteFile(err)
}
return buf.String(), nil
}
// ReadLocalFile takes in the location of a local file
// in the format `file://location/of/file` and returns
// the content of the file if the path is valid and no
// error occurs
func ReadLocalFile(location string) (string, error) {
// remove the protocol prefix
location = strings.TrimPrefix(location, "file://")
// Need to support variable file locations hence
// #nosec
data, err := ioutil.ReadFile(location)
if err != nil {
return "", ErrReadingLocalFile(err)
}
return string(data), nil
}
// Gets the latest stable release tags from github for a given org name and repo name(in that org) in sorted order
func GetLatestReleaseTagsSorted(org string, repo string) ([]string, error) {
var url string = "https://github.com/" + org + "/" + repo + "/releases"
resp, err := http.Get(url)
if err != nil {
return nil, ErrGettingLatestReleaseTag(err)
}
defer safeClose(resp.Body)
if resp.StatusCode != http.StatusOK {
return nil, ErrGettingLatestReleaseTag(err)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, ErrGettingLatestReleaseTag(err)
}
re := regexp.MustCompile("/releases/tag/(.*?)\"")
releases := re.FindAllString(string(body), -1)
if len(releases) == 0 {
return nil, ErrGettingLatestReleaseTag(errors.New("no release found in this repository"))
}
var versions []string
for _, rel := range releases {
latest := strings.ReplaceAll(rel, "/releases/tag/", "")
latest = strings.ReplaceAll(latest, "\"", "")
versions = append(versions, latest)
}
versions = SortDottedStringsByDigits(versions)
return versions, nil
}
// SafeClose is a helper function help to close the io
func safeClose(co io.Closer) {
if cerr := co.Close(); cerr != nil {
log.Error(cerr)
}
}