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callback.go
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callback.go
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package server
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
)
// callbackFn is a function which will post a callback when invoked
type callbackFn func(ctx context.Context, v interface{}) []error
// parseCallback parses a callback URL from URL query values and returns a closure which can send
// a payload back to the specified URL when invoked.
func parseCallback(query url.Values) (callbackFn, error) {
encodedURLs, exist := query["callback"]
if !exist {
noOpCallback := func(_ context.Context, _ interface{}) []error {
return nil
}
return noOpCallback, nil
}
decodedURLs := make([]string, len(encodedURLs))
for i, v := range encodedURLs {
d, err := url.QueryUnescape(v)
if err != nil {
return nil, fmt.Errorf("could not decode url %q: %w", v, err)
}
decodedURLs[i] = d
}
client := &http.Client{}
return func(ctx context.Context, v interface{}) []error {
payload, err := json.Marshal(v)
if err != nil {
return []error{fmt.Errorf("error encoding %v: %w", v, err)}
}
var errors []error
for _, callBackURL := range decodedURLs {
reader := bytes.NewReader(payload)
req, err := http.NewRequestWithContext(ctx, http.MethodPost, callBackURL, reader)
if err != nil {
errors = append(errors, fmt.Errorf("error creating request to %q: %w", callBackURL, err))
continue
}
req.Header.Set("Content-Type", "application/json")
resp, err := client.Do(req)
if err != nil {
errors = append(
errors,
fmt.Errorf("error while posting callback to %q: %w", callBackURL, err),
)
continue
}
if resp.StatusCode != http.StatusOK {
errors = append(
errors,
fmt.Errorf("error while posting callback to %q: status code %d", callBackURL, resp.StatusCode),
)
}
}
return errors
}, nil
}