feat: implement caldav search

vendor/github.com/dolanor/caldav-go/http/client.go

@@ -0,0 +1,53 @@
+package http
+
+import (
+	"github.com/dolanor/caldav-go/utils"
+	"net/http"
+)
+
+// a client for making HTTP requests
+type Client struct {
+	native         *http.Client
+	server         *Server
+	requestHeaders map[string]string
+}
+
+func (c *Client) SetHeader(key string, value string) {
+	if c.requestHeaders == nil {
+		c.requestHeaders = map[string]string{}
+	}
+	c.requestHeaders[key] = value
+}
+
+// downcasts to the native HTTP interface
+func (c *Client) Native() *http.Client {
+	return c.native
+}
+
+// returns the embedded HTTP server reference
+func (c *Client) Server() *Server {
+	return c.server
+}
+
+// executes an HTTP request
+func (c *Client) Do(req *Request) (*Response, error) {
+	for key, value := range c.requestHeaders {
+		req.Header.Add(key, value)
+	}
+	if resp, err := c.Native().Do((*http.Request)(req)); err != nil {
+		return nil, utils.NewError(c.Do, "unable to execute HTTP request", c, err)
+	} else {
+		return NewResponse(resp), nil
+	}
+}
+
+// creates a new client for communicating with an HTTP server
+func NewClient(server *Server, native *http.Client) *Client {
+	return &Client{server: server, native: native}
+}
+
+// creates a new client for communicating with a server
+// uses the default HTTP client from net/http
+func NewDefaultClient(server *Server) *Client {
+	return NewClient(server, http.DefaultClient)
+}