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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package covermerger
import (
"encoding/base64"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
)
type FuncProxyURI func(filePath, commit string) string
type webGit struct {
funcProxy FuncProxyURI
}
func (mr *webGit) GetFileVersions(targetFilePath string, repoCommits ...RepoCommit,
) (FileVersions, error) {
res := make(FileVersions)
for _, repoCommit := range repoCommits {
fileBytes, err := mr.loadFile(targetFilePath, repoCommit.Repo, repoCommit.Commit)
// It is ok if some file doesn't exist. It means we have repo FS diff.
if err == errFileNotFound {
continue
}
if err != nil {
return nil, fmt.Errorf("failed to loadFile: %w", err)
}
res[repoCommit] = string(fileBytes)
}
return res, nil
}
var errFileNotFound = errors.New("file not found")
func (mr *webGit) loadFile(filePath, repo, commit string) ([]byte, error) {
var uri string
if mr.funcProxy != nil {
uri = mr.funcProxy(filePath, commit)
} else {
uri = fmt.Sprintf("%s/plain/%s", repo, filePath)
if commit != "latest" {
uri += "?id=" + commit
}
}
u, err := url.Parse(uri)
if err != nil {
return nil, fmt.Errorf("failed to parse %v: %w", uri, err)
}
u.Scheme = "https"
uri = u.String()
resp, err := http.Get(uri)
if err != nil {
return nil, fmt.Errorf("failed to http.Get: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode == 404 {
return nil, errFileNotFound
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("error: status %d getting '%s'", resp.StatusCode, uri)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to io.ReadAll from body: %w", err)
}
if isGerritServer(resp) {
if body, err = base64.StdEncoding.DecodeString(string(body)); err != nil {
return nil, fmt.Errorf("base64.StdEncoding.DecodeString: %w", err)
}
}
return body, nil
}
func isGerritServer(resp *http.Response) bool {
for _, headerVals := range resp.Header {
for _, header := range headerVals {
if strings.Contains(header, "gerrit") {
return true
}
}
}
return false
}
func MakeWebGit(funcProxy FuncProxyURI) FileVersProvider {
return &webGit{
funcProxy: funcProxy,
}
}
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