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properties_file_loader.go
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/
properties_file_loader.go
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// Heavily copied and inspired by urfave/cli and https://stackoverflow.com/a/46860900/372019
package fileutil
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"runtime"
"strings"
"github.com/urfave/cli"
"github.com/urfave/cli/altsrc"
)
func readPropertiesFile(filename string) (map[interface{}]interface{}, error) {
config := map[interface{}]interface{}{}
if len(filename) == 0 {
return config, nil
}
raw, err := loadDataFrom(filename)
if err != nil {
log.Fatal(err)
return nil, err
}
scanner := bufio.NewScanner(bytes.NewReader(raw))
for scanner.Scan() {
line := scanner.Text()
if equal := strings.Index(line, "="); equal >= 0 {
if key := strings.TrimSpace(line[:equal]); len(key) > 0 {
value := ""
if len(line) > equal {
value = strings.TrimSpace(line[equal+1:])
}
config[key] = value
}
}
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
return nil, err
}
return config, nil
}
type propertiesSourceContext struct {
FilePath string
}
// NewPropertiesSourceFromFile creates a new Properties InputSourceContext from a filepath.
func NewPropertiesSourceFromFile(file string) (altsrc.InputSourceContext, error) {
ysc := &propertiesSourceContext{FilePath: file}
var results map[interface{}]interface{}
results, err := readPropertiesFile(ysc.FilePath)
if err != nil {
return nil, fmt.Errorf("Unable to load Properties file '%s': inner error: \n'%v'", ysc.FilePath, err.Error())
}
return &MapInputSource{valueMap: results}, nil
}
// NewPropertiesSourceFromFlagFunc creates a new Properties InputSourceContext from a provided flag name and source context.
func NewPropertiesSourceFromFlagFunc(flagFileName string) func(context *cli.Context) (altsrc.InputSourceContext, error) {
return func(context *cli.Context) (altsrc.InputSourceContext, error) {
filePath := context.String(flagFileName)
return NewPropertiesSourceFromFile(filePath)
}
}
func loadDataFrom(filePath string) ([]byte, error) {
u, err := url.Parse(filePath)
if err != nil {
return nil, err
}
if u.Host != "" { // i have a host, now do i support the scheme?
switch u.Scheme {
case "http", "https":
res, err := http.Get(filePath)
if err != nil {
return nil, err
}
return ioutil.ReadAll(res.Body)
default:
return nil, fmt.Errorf("scheme of %s is unsupported", filePath)
}
} else if u.Path != "" { // i dont have a host, but I have a path. I am a local file.
if _, notFoundFileErr := os.Stat(filePath); notFoundFileErr != nil {
return nil, fmt.Errorf("cannot read from file: '%s' because it does not exist", filePath)
}
return ioutil.ReadFile(filePath)
} else if runtime.GOOS == "windows" && strings.Contains(u.String(), "\\") {
// on Windows systems u.Path is always empty, so we need to check the string directly.
if _, notFoundFileErr := os.Stat(filePath); notFoundFileErr != nil {
return nil, fmt.Errorf("cannot read from file: '%s' because it does not exist", filePath)
}
return ioutil.ReadFile(filePath)
} else {
return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
}
}