terraform/config/module/detect_github.go

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package module
import (
"fmt"
"net/url"
"strings"
)
// GitHubDetector implements Detector to detect GitHub URLs and turn
// them into URLs that the Git Getter can understand.
type GitHubDetector struct{}
func (d *GitHubDetector) Detect(src, _ string) (string, bool, error) {
if len(src) == 0 {
return "", false, nil
}
if strings.HasPrefix(src, "github.com/") {
return d.detectHTTP(src)
} else if strings.HasPrefix(src, "git@github.com:") {
return d.detectSSH(src)
}
return "", false, nil
}
func (d *GitHubDetector) detectHTTP(src string) (string, bool, error) {
parts := strings.Split(src, "/")
if len(parts) < 3 {
return "", false, fmt.Errorf(
"GitHub URLs should be github.com/username/repo")
}
urlStr := fmt.Sprintf("https://%s", strings.Join(parts[:3], "/"))
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url, err := url.Parse(urlStr)
if err != nil {
return "", true, fmt.Errorf("error parsing GitHub URL: %s", err)
}
if !strings.HasSuffix(url.Path, ".git") {
url.Path += ".git"
}
if len(parts) > 3 {
url.Path += "//" + strings.Join(parts[3:], "/")
}
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return "git::" + url.String(), true, nil
}
func (d *GitHubDetector) detectSSH(src string) (string, bool, error) {
idx := strings.Index(src, ":")
qidx := strings.Index(src, "?")
if qidx == -1 {
qidx = len(src)
}
var u url.URL
u.Scheme = "ssh"
u.User = url.User("git")
u.Host = "github.com"
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u.Path = src[idx+1 : qidx]
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if qidx < len(src) {
q, err := url.ParseQuery(src[qidx+1:])
if err != nil {
return "", true, fmt.Errorf("error parsing GitHub SSH URL: %s", err)
}
u.RawQuery = q.Encode()
}
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return "git::" + u.String(), true, nil
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}