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client.go
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client.go
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// MIT License
// Copyright (c) 2016 @zet4 / @Zeta#2229 / <[email protected]>
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package owo
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"mime"
"mime/multipart"
"net/http"
"net/textproto"
"net/url"
"path"
"strings"
"time"
)
type (
// Client stores http client and key
Client struct {
Key string
APIRoot string
APIFileUploadEndpoint string
APIShortenEndpoint string
http *http.Client
}
// NamedReader wrapper for a single file to upload
NamedReader struct {
Reader io.Reader
Filename string
}
)
var (
global = NewClient("", OfficialAPIRoot, "", "", &http.Client{Timeout: time.Minute})
)
// NewClient returns a fully configured client
func NewClient(key, root, upload, shorten string, http *http.Client) *Client {
c := &Client{http: http}
if key != "" {
c.Key = key
}
if root != "" {
c.APIRoot = root
}
if upload != "" {
c.APIFileUploadEndpoint = upload
}
if shorten != "" {
c.APIShortenEndpoint = shorten
}
return c
}
// DefaultClient returns a client with the default, official parameters
func DefaultClient() *Client {
return global
}
// UploadFile uploads a file
func (o *Client) UploadFile(ctx context.Context, r NamedReader) (response *Response, err error) {
return o.UploadFiles(ctx, []NamedReader{r})
}
var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
func escapeQuotes(s string) string {
return quoteEscaper.Replace(s)
}
// UploadFiles uploads multiple files using the client
func (o *Client) UploadFiles(ctx context.Context, rs []NamedReader) (response *Response, err error) {
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
for _, r := range rs {
h := make(textproto.MIMEHeader)
h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="files[]" filename="%s"`, escapeQuotes(r.Filename)))
var buf bytes.Buffer
var b []byte
tee := io.TeeReader(r.Reader, &buf)
b, err = ioutil.ReadAll(&buf)
if err != nil {
return
}
contenttype := http.DetectContentType(b)
if contenttype == "application/octet-stream" {
contenttype = mime.TypeByExtension(path.Ext(r.Filename))
if contenttype == "" {
contenttype = "application/octet-stream"
}
}
h.Set("Content-Type", contenttype)
part, err := writer.CreatePart(h)
if err != nil {
return nil, err
}
_, err = io.Copy(part, tee)
if err != nil {
return nil, err
}
}
err = writer.Close()
if err != nil {
return
}
req, err := http.NewRequest("POST", o.APIRoot+APIFileUploadEndpoint, body)
req.Header.Set("Content-Type", writer.FormDataContentType())
req.Header.Set("Authorization", o.Key)
req = req.WithContext(ctx)
resp, err := o.http.Do(req)
if err != nil {
return
}
err = json.NewDecoder(resp.Body).Decode(&response)
if err != nil {
return
}
if !response.Success {
return nil, &ErrUploadFailed{response.Description, response.Errorcode}
}
return
}
/*
Polr compatible url shortening wrapper
*/
// ShortenURLs shortens multiple urls
func (o *Client) ShortenURLs(ctx context.Context, urls []string) (shortened []string, err error) {
shortened = make([]string, len(urls))
for idx, u := range urls {
result, err := o.ShortenURL(ctx, u)
shortened[idx] = result
if err != nil {
return shortened, err
}
}
return
}
// ShortenURL shortens a single url
func (o *Client) ShortenURL(ctx context.Context, u string) (shortened string, err error) {
v := url.Values{}
v.Set("key", o.Key)
v.Set("action", "shorten")
v.Add("url", u)
au, err := url.Parse(o.APIRoot + APIShortenEndpoint)
if err != nil {
return
}
au.RawQuery = v.Encode()
req, err := http.NewRequest("GET", au.String(), nil)
if err != nil {
return
}
req = req.WithContext(ctx)
resp, err := o.http.Do(req)
if err != nil {
return
}
if resp.StatusCode != 200 {
resp.Body.Close()
return "", fmt.Errorf("Unexpected status code '%d', expected 200.", resp.StatusCode)
}
respstr, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return
}
shortened = string(respstr)
return
}