Convert everything but serverkeyapi to inthttp (#1096)

* Convert roomserver to new inthttp format

* Convert eduserver to new inthttp format

* Convert appservice to new inthttp format

eduserver/inthttp/client.go

@@ -0,0 +1,56 @@
+package inthttp
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/eduserver/api"
+	internalHTTP "github.com/matrix-org/dendrite/internal/http"
+	"github.com/opentracing/opentracing-go"
+)
+
+// HTTP paths for the internal HTTP APIs
+const (
+	EDUServerInputTypingEventPath       = "/eduserver/input"
+	EDUServerInputSendToDeviceEventPath = "/eduserver/sendToDevice"
+)
+
+// NewEDUServerClient creates a EDUServerInputAPI implemented by talking to a HTTP POST API.
+func NewEDUServerClient(eduServerURL string, httpClient *http.Client) (api.EDUServerInputAPI, error) {
+	if httpClient == nil {
+		return nil, errors.New("NewEDUServerClient: httpClient is <nil>")
+	}
+	return &httpEDUServerInputAPI{eduServerURL, httpClient}, nil
+}
+
+type httpEDUServerInputAPI struct {
+	eduServerURL string
+	httpClient   *http.Client
+}
+
+// InputTypingEvent implements EDUServerInputAPI
+func (h *httpEDUServerInputAPI) InputTypingEvent(
+	ctx context.Context,
+	request *api.InputTypingEventRequest,
+	response *api.InputTypingEventResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "InputTypingEvent")
+	defer span.Finish()
+
+	apiURL := h.eduServerURL + EDUServerInputTypingEventPath
+	return internalHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}
+
+// InputSendToDeviceEvent implements EDUServerInputAPI
+func (h *httpEDUServerInputAPI) InputSendToDeviceEvent(
+	ctx context.Context,
+	request *api.InputSendToDeviceEventRequest,
+	response *api.InputSendToDeviceEventResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "InputSendToDeviceEvent")
+	defer span.Finish()
+
+	apiURL := h.eduServerURL + EDUServerInputSendToDeviceEventPath
+	return internalHTTP.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}