75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
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package gateway
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import (
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"context"
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"encoding/base64"
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"github.com/aws/aws-lambda-go/events"
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"github.com/pkg/errors"
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)
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// NewRequest returns a new http.Request from the given Lambda event.
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func NewRequest(ctx context.Context, e events.APIGatewayProxyRequest) (*http.Request, error) {
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// path
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u, err := url.Parse(e.Path)
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if err != nil {
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return nil, errors.Wrap(err, "parsing path")
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}
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// querystring
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q := u.Query()
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for k, v := range e.QueryStringParameters {
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q.Set(k, v)
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}
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u.RawQuery = q.Encode()
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// base64 encoded body
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body := e.Body
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if e.IsBase64Encoded {
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b, err := base64.StdEncoding.DecodeString(body)
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if err != nil {
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return nil, errors.Wrap(err, "decoding base64 body")
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}
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body = string(b)
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}
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// new request
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req, err := http.NewRequest(e.HTTPMethod, u.String(), strings.NewReader(body))
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if err != nil {
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return nil, errors.Wrap(err, "creating request")
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}
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// remote addr
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req.RemoteAddr = e.RequestContext.Identity.SourceIP
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// header fields
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for k, v := range e.Headers {
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req.Header.Set(k, v)
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}
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// content-length
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if req.Header.Get("Content-Length") == "" && body != "" {
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req.Header.Set("Content-Length", strconv.Itoa(len(body)))
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}
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// custom fields
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req.Header.Set("X-Request-Id", e.RequestContext.RequestID)
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req.Header.Set("X-Stage", e.RequestContext.Stage)
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// xray support
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if traceID := ctx.Value("x-amzn-trace-id"); traceID != nil {
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req.Header.Set("X-Amzn-Trace-Id", fmt.Sprintf("%v", traceID))
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}
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// host
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req.URL.Host = req.Header.Get("Host")
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req.Host = req.URL.Host
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return req, nil
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}
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