54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package vcs
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import (
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"context"
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"encoding/xml"
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"errors"
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"net/http"
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"strings"
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)
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// MetaImports resolved module import path for certain hosts using the special <meta> tag.
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func MetaImports(ctx context.Context, module string) (string, error) {
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if strings.HasPrefix(module, "github.com/") || strings.HasPrefix(module, "bitbucket.org/") {
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return module, nil
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}
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// TODO: use context
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res, err := http.Get("https://" + module + "?go-get=1")
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if err != nil {
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return "", err
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}
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defer res.Body.Close()
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html := struct {
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HTML string `xml:"html"`
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Head struct {
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Meta []struct {
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Name string `xml:"name,attr"`
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Content string `xml:"content,attr"`
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} `xml:"meta"`
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} `xml:"head"`
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}{}
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dec := xml.NewDecoder(res.Body)
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dec.Strict = false
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dec.AutoClose = xml.HTMLAutoClose
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dec.Entity = xml.HTMLEntity
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if err := dec.Decode(&html); err != nil {
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return "", err
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}
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for _, meta := range html.Head.Meta {
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if meta.Name == "go-import" {
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if f := strings.Fields(meta.Content); len(f) == 3 {
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if f[0] != module {
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return "", errors.New("prefix does not match the module")
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}
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url := f[2]
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if i := strings.Index(url, "://"); i >= 0 {
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url = url[i+3:]
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}
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return url, nil
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}
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}
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}
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return "", errors.New("go-import meta tag not found")
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}
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