go-webdav/internal/client.go
2020-02-12 20:06:06 +01:00

181 lines
4.0 KiB
Go

package internal
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"net/http"
"net/url"
"path"
"strings"
"unicode"
)
type Client struct {
http *http.Client
endpoint *url.URL
username, password string
}
func NewClient(c *http.Client, endpoint string) (*Client, error) {
if c == nil {
c = http.DefaultClient
}
u, err := url.Parse(endpoint)
if err != nil {
return nil, err
}
if u.Path == "" {
// This is important to avoid issues with path.Join
u.Path = "/"
}
return &Client{http: c, endpoint: u}, nil
}
func (c *Client) SetBasicAuth(username, password string) {
c.username = username
c.password = password
}
func (c *Client) ResolveHref(p string) *url.URL {
if !strings.HasPrefix(p, "/") {
p = path.Join(c.endpoint.Path, p)
}
return &url.URL{
Scheme: c.endpoint.Scheme,
User: c.endpoint.User,
Host: c.endpoint.Host,
Path: p,
}
}
func (c *Client) NewRequest(method string, path string, body io.Reader) (*http.Request, error) {
return http.NewRequest(method, c.ResolveHref(path).String(), body)
}
func (c *Client) NewXMLRequest(method string, path string, v interface{}) (*http.Request, error) {
var buf bytes.Buffer
buf.WriteString(xml.Header)
if err := xml.NewEncoder(&buf).Encode(v); err != nil {
return nil, err
}
req, err := c.NewRequest(method, path, &buf)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "text/xml; charset=\"utf-8\"")
return req, nil
}
func (c *Client) Do(req *http.Request) (*http.Response, error) {
if c.username != "" || c.password != "" {
req.SetBasicAuth(c.username, c.password)
}
resp, err := c.http.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode/100 != 2 {
var wrappedErr error
if strings.HasPrefix(resp.Header.Get("Content-Type"), "text/") {
lr := io.LimitedReader{R: resp.Body, N: 1024}
var buf bytes.Buffer
io.Copy(&buf, &lr)
resp.Body.Close()
if s := strings.TrimSpace(buf.String()); s != "" {
if lr.N == 0 {
s += " […]"
}
wrappedErr = fmt.Errorf("%v", s)
}
}
return nil, &HTTPError{Code: resp.StatusCode, Err: wrappedErr}
}
return resp, nil
}
func (c *Client) DoMultiStatus(req *http.Request) (*Multistatus, error) {
resp, err := c.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusMultiStatus {
return nil, fmt.Errorf("HTTP multi-status request failed: %v", resp.Status)
}
// TODO: the response can be quite large, support streaming Response elements
var ms Multistatus
if err := xml.NewDecoder(resp.Body).Decode(&ms); err != nil {
return nil, err
}
return &ms, nil
}
func (c *Client) Propfind(path string, depth Depth, propfind *Propfind) (*Multistatus, error) {
req, err := c.NewXMLRequest("PROPFIND", path, propfind)
if err != nil {
return nil, err
}
req.Header.Add("Depth", depth.String())
return c.DoMultiStatus(req)
}
// PropfindFlat performs a PROPFIND request with a zero depth.
func (c *Client) PropfindFlat(path string, propfind *Propfind) (*Response, error) {
ms, err := c.Propfind(path, DepthZero, propfind)
if err != nil {
return nil, err
}
return ms.Get(c.ResolveHref(path).Path)
}
func parseCommaSeparatedSet(values []string, upper bool) map[string]bool {
m := make(map[string]bool)
for _, v := range values {
fields := strings.FieldsFunc(v, func(r rune) bool {
return unicode.IsSpace(r) || r == ','
})
for _, f := range fields {
if upper {
f = strings.ToUpper(f)
} else {
f = strings.ToLower(f)
}
m[f] = true
}
}
return m
}
func (c *Client) Options(path string) (classes map[string]bool, methods map[string]bool, err error) {
req, err := c.NewRequest(http.MethodOptions, path, nil)
if err != nil {
return nil, nil, err
}
resp, err := c.Do(req)
if err != nil {
return nil, nil, err
}
resp.Body.Close()
classes = parseCommaSeparatedSet(resp.Header["Dav"], false)
if !classes["1"] {
return nil, nil, fmt.Errorf("webdav: server doesn't support DAV class 1")
}
methods = parseCommaSeparatedSet(resp.Header["Allow"], true)
return classes, methods, nil
}