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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package httputil
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strings"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
)
// PostJSON performs a POST request with JSON on an internal HTTP API
func PostJSON(
ctx context.Context, span opentracing.Span, httpClient *http.Client,
apiURL string, request, response interface{},
) error {
jsonBytes, err := json.Marshal(request)
if err != nil {
return err
}
parsedAPIURL, err := url.Parse(apiURL)
if err != nil {
return err
}
parsedAPIURL.Path = InternalPathPrefix + strings.TrimLeft(parsedAPIURL.Path, "/")
apiURL = parsedAPIURL.String()
req, err := http.NewRequest(http.MethodPost, apiURL, bytes.NewReader(jsonBytes))
if err != nil {
return err
}
// Mark the span as being an RPC client.
ext.SpanKindRPCClient.Set(span)
carrier := opentracing.HTTPHeadersCarrier(req.Header)
tracer := opentracing.GlobalTracer()
if err = tracer.Inject(span.Context(), opentracing.HTTPHeaders, carrier); err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
res, err := httpClient.Do(req.WithContext(ctx))
if res != nil {
defer (func() { err = res.Body.Close() })()
}
if err != nil {
return err
}
if res.StatusCode != http.StatusOK {
var errorBody struct {
Message string `json:"message"`
}
if msgerr := json.NewDecoder(res.Body).Decode(&errorBody); msgerr == nil {
return fmt.Errorf("Internal API: %d from %s: %s", res.StatusCode, apiURL, errorBody.Message)
}
return fmt.Errorf("Internal API: %d from %s", res.StatusCode, apiURL)
}
return json.NewDecoder(res.Body).Decode(response)
}
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