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package data
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io/fs"
"net/url"
"path/filepath"
"strings"
"github.com/hairyhenderson/gomplate/v4/internal/datafs"
)
func readFile(ctx context.Context, source *Source, args ...string) ([]byte, error) {
if source.fs == nil {
fsp := datafs.FSProviderFromContext(ctx)
fsys, err := fsp.New(source.URL)
if err != nil {
return nil, fmt.Errorf("filesystem provider for %q unavailable: %w", source.URL, err)
}
source.fs = fsys
}
p := filepath.FromSlash(source.URL.Path)
if len(args) == 1 {
parsed, err := url.Parse(args[0])
if err != nil {
return nil, err
}
if parsed.Path != "" {
p = filepath.Join(p, parsed.Path)
}
// reset the media type - it may have been set by a parent dir read
source.mediaType = ""
}
isDir := strings.HasSuffix(p, string(filepath.Separator))
if strings.HasSuffix(p, string(filepath.Separator)) {
p = p[:len(p)-1]
}
// make sure we can access the file
i, err := fs.Stat(source.fs, p)
if err != nil {
return nil, fmt.Errorf("stat %s: %w", p, err)
}
if isDir {
source.mediaType = jsonArrayMimetype
if i.IsDir() {
return readFileDir(source, p)
}
return nil, fmt.Errorf("%s is not a directory", p)
}
b, err := fs.ReadFile(source.fs, p)
if err != nil {
return nil, fmt.Errorf("readFile %s: %w", p, err)
}
return b, nil
}
func readFileDir(source *Source, p string) ([]byte, error) {
names, err := fs.ReadDir(source.fs, p)
if err != nil {
return nil, err
}
files := make([]string, len(names))
for i, v := range names {
files[i] = v.Name()
}
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
if err := enc.Encode(files); err != nil {
return nil, err
}
b := buf.Bytes()
// chop off the newline added by the json encoder
return b[:len(b)-1], nil
}
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