go-mastodon/mastodon.go

260 lines
5.3 KiB
Go

package mastodon
import (
"bytes"
"context"
"encoding/json"
"io"
"mime/multipart"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"time"
)
// Config is a setting for access mastodon APIs.
type Config struct {
Server string
ClientID string
ClientSecret string
AccessToken string
}
// Client is a API client for mastodon.
type Client struct {
http.Client
config *Config
interval time.Duration
}
type page struct {
next string
}
func linkHeader(h http.Header, rel string) []string {
var links []string
for _, v := range h["Link"] {
var p string
for len(v) > 0 {
i := strings.Index(v, ";")
if i < 0 {
break
}
e := i
i++
for i < len(v) {
if v[i] != ' ' {
break
}
i++
}
p = strings.TrimSpace(v[i:])
if !strings.HasPrefix(p, "rel=") {
break
}
i += 4
pos := strings.Index(p[4:], `,`)
if pos > 0 {
p = p[4 : 4+pos]
i += pos
} else {
p = p[4:]
i = len(v) - 1
}
if k := strings.Trim(p, `"`); k == rel {
links = append(links, strings.Trim(v[:e], "<>"))
}
i++
for i < len(v) {
if v[i] != ' ' {
break
}
i++
}
v = v[i:]
}
}
return links
}
func (c *Client) doAPI(ctx context.Context, method string, uri string, params interface{}, res interface{}, next *bool) error {
u, err := url.Parse(c.config.Server)
if err != nil {
return err
}
u.Path = path.Join(u.Path, uri)
var req *http.Request
ct := "application/x-www-form-urlencoded"
if values, ok := params.(url.Values); ok {
var body io.Reader
if method == http.MethodGet {
u.RawQuery = values.Encode()
} else {
body = strings.NewReader(values.Encode())
}
req, err = http.NewRequest(method, u.String(), body)
if err != nil {
return err
}
} else if file, ok := params.(string); ok {
f, err := os.Open(file)
if err != nil {
return err
}
defer f.Close()
var buf bytes.Buffer
mw := multipart.NewWriter(&buf)
part, err := mw.CreateFormFile("file", filepath.Base(file))
if err != nil {
return err
}
_, err = io.Copy(part, f)
if err != nil {
return err
}
err = mw.Close()
if err != nil {
return err
}
req, err = http.NewRequest(method, u.String(), &buf)
if err != nil {
return err
}
ct = mw.FormDataContentType()
} else {
req, err = http.NewRequest(method, u.String(), nil)
if err != nil {
return err
}
}
req = req.WithContext(ctx)
req.Header.Set("Authorization", "Bearer "+c.config.AccessToken)
if params != nil {
req.Header.Set("Content-Type", ct)
}
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if next != nil && params != nil {
nl := linkHeader(resp.Header, "next")
*next = false
if len(nl) > 0 {
u, err = url.Parse(nl[0])
if err == nil {
for k, v := range u.Query() {
params.(url.Values)[k] = v
}
}
*next = true
}
}
if resp.StatusCode != http.StatusOK {
return parseAPIError("bad request", resp)
} else if res == nil {
return nil
}
return json.NewDecoder(resp.Body).Decode(&res)
}
// NewClient return new mastodon API client.
func NewClient(config *Config) *Client {
return &Client{
Client: *http.DefaultClient,
config: config,
interval: 10 * time.Second,
}
}
// Authenticate get access-token to the API.
func (c *Client) Authenticate(ctx context.Context, username, password string) error {
params := url.Values{}
params.Set("client_id", c.config.ClientID)
params.Set("client_secret", c.config.ClientSecret)
params.Set("grant_type", "password")
params.Set("username", username)
params.Set("password", password)
params.Set("scope", "read write follow")
u, err := url.Parse(c.config.Server)
if err != nil {
return err
}
u.Path = path.Join(u.Path, "/oauth/token")
req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(params.Encode()))
if err != nil {
return err
}
req = req.WithContext(ctx)
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return parseAPIError("bad authorization", resp)
}
res := struct {
AccessToken string `json:"access_token"`
}{}
err = json.NewDecoder(resp.Body).Decode(&res)
if err != nil {
return err
}
c.config.AccessToken = res.AccessToken
return nil
}
// Toot is struct to post status.
type Toot struct {
Status string `json:"status"`
InReplyToID int64 `json:"in_reply_to_id"`
MediaIDs []int64 `json:"media_ids"`
Sensitive bool `json:"sensitive"`
SpoilerText string `json:"spoiler_text"`
Visibility string `json:"visibility"`
}
// Mention hold information for mention.
type Mention struct {
URL string `json:"url"`
Username string `json:"username"`
Acct string `json:"acct"`
ID int64 `json:"id"`
}
// Tag hold information for tag.
type Tag struct {
Name string `json:"name"`
URL string `json:"url"`
}
// Attachment hold information for attachment.
type Attachment struct {
ID int64 `json:"id"`
Type string `json:"type"`
URL string `json:"url"`
RemoteURL string `json:"remote_url"`
PreviewURL string `json:"preview_url"`
TextURL string `json:"text_url"`
}
// Results hold information for search result.
type Results struct {
Accounts []*Account `json:"accounts"`
Statuses []*Status `json:"statuses"`
Hashtags []string `json:"hashtags"`
}