Split the AWS version into its own module

This allows the rather large AWS Lambda SDK to only be fetched if the
command itself is being fetched.

1 files changed, 58 insertions, 0 deletions

diff --git a/cmd/go-import-redirect-aws/main.go b/cmd/go-import-redirect-aws/main.go
new file mode 100644
index 0000000..fb758a3
--- /dev/null
+++ b/cmd/go-import-redirect-aws/main.go
@@ -0,0 +1,58 @@
+// 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)
+}