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// SPDX-FileCopyrightText: © 2019 Grégoire Duchêne <gduchene@awhk.org>
// SPDX-License-Identifier: ISC
package main
import (
"context"
"net/http"
"os"
"path"
"regexp"
"strings"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"go.awhk.org/go-import-redirect/pkg/redirector"
)
var transf = redirector.Transformer{
Pattern: &redirector.Pattern{regexp.MustCompile(strings.ReplaceAll(os.Getenv("FROM"), `\\`, `\`))},
Replacement: os.Getenv("TO"),
VCS: os.Getenv("VCS"),
}
func redirect(ctx context.Context, req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
pkg := path.Join(req.Headers["Host"], req.Path)
if !transf.Pattern.MatchString(pkg) {
return events.APIGatewayProxyResponse{StatusCode: http.StatusNotFound}, nil
}
if v, ok := req.QueryStringParameters["go-get"]; !ok || v != "1" {
return events.APIGatewayProxyResponse{
Headers: map[string]string{"Location": "https://pkg.go.dev/" + pkg},
StatusCode: http.StatusFound,
}, nil
}
data := redirector.TemplateData{
Package: pkg,
Repository: transf.Pattern.ReplaceAllString(pkg, transf.Replacement),
VCS: transf.VCS,
}
var buf strings.Builder
if err := redirector.DefaultTemplate.Execute(&buf, data); err != nil {
return events.APIGatewayProxyResponse{}, err
}
return events.APIGatewayProxyResponse{
Body: buf.String(),
Headers: map[string]string{"Content-Type": "text/html; charset=utf-8"},
StatusCode: http.StatusOK,
}, nil
}
func main() {
lambda.Start(redirect)
}
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