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package getter
import (
"fmt"
"path/filepath"
"github.com/hashicorp/go-getter/helper/url"
)
// Detector defines the interface that an invalid URL or a URL with a blank
// scheme is passed through in order to determine if its shorthand for
// something else well-known.
type Detector interface {
// Detect will detect whether the string matches a known pattern to
// turn it into a proper URL.
Detect(string, string) (string, bool, error)
}
// Detectors is the list of detectors that are tried on an invalid URL.
// This is also the order they're tried (index 0 is first).
var Detectors []Detector
func init() {
Detectors = []Detector{
new(GitHubDetector),
new(GitDetector),
new(BitBucketDetector),
new(S3Detector),
new(GCSDetector),
new(FileDetector),
}
}
// Detect turns a source string into another source string if it is
// detected to be of a known pattern.
//
// The third parameter should be the list of detectors to use in the
// order to try them. If you don't want to configure this, just use
// the global Detectors variable.
//
// This is safe to be called with an already valid source string: Detect
// will just return it.
func Detect(src string, pwd string, ds []Detector) (string, error) {
getForce, getSrc := getForcedGetter(src)
// Separate out the subdir if there is one, we don't pass that to detect
getSrc, subDir := SourceDirSubdir(getSrc)
u, err := url.Parse(getSrc)
if err == nil && u.Scheme != "" {
// Valid URL
return src, nil
}
for _, d := range ds {
result, ok, err := d.Detect(getSrc, pwd)
if err != nil {
return "", err
}
if !ok {
continue
}
var detectForce string
detectForce, result = getForcedGetter(result)
result, detectSubdir := SourceDirSubdir(result)
// If we have a subdir from the detection, then prepend it to our
// requested subdir.
if detectSubdir != "" {
if subDir != "" {
subDir = filepath.Join(detectSubdir, subDir)
} else {
subDir = detectSubdir
}
}
if subDir != "" {
u, err := url.Parse(result)
if err != nil {
return "", fmt.Errorf("Error parsing URL: %s", err)
}
u.Path += "//" + subDir
// a subdir may contain wildcards, but in order to support them we
// have to ensure the path isn't escaped.
u.RawPath = u.Path
result = u.String()
}
// Preserve the forced getter if it exists. We try to use the
// original set force first, followed by any force set by the
// detector.
if getForce != "" {
result = fmt.Sprintf("%s::%s", getForce, result)
} else if detectForce != "" {
result = fmt.Sprintf("%s::%s", detectForce, result)
}
return result, nil
}
return "", fmt.Errorf("invalid source string: %s", src)
}
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