go-mastodon/mastodon.go

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package mastodon
import (
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"bytes"
"context"
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"encoding/json"
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"errors"
"fmt"
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"io"
"mime/multipart"
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"net/http"
"net/url"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/tomnomnom/linkheader"
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)
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// Config is a setting for access mastodon APIs.
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type Config struct {
Server string
ClientID string
ClientSecret string
AccessToken string
}
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// Client is a API client for mastodon.
type Client struct {
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http.Client
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config *Config
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}
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func (c *Client) doAPI(ctx context.Context, method string, uri string, params interface{}, res interface{}, pg *Pagination) error {
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u, err := url.Parse(c.config.Server)
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if err != nil {
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return err
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}
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u.Path = path.Join(u.Path, uri)
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var req *http.Request
ct := "application/x-www-form-urlencoded"
if values, ok := params.(url.Values); ok {
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var body io.Reader
if method == http.MethodGet {
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if pg != nil {
values = pg.setValues(values)
}
u.RawQuery = values.Encode()
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} else {
body = strings.NewReader(values.Encode())
}
req, err = http.NewRequest(method, u.String(), body)
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if err != nil {
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return err
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}
} else if file, ok := params.(string); ok {
f, err := os.Open(file)
if err != nil {
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return err
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}
defer f.Close()
var buf bytes.Buffer
mw := multipart.NewWriter(&buf)
part, err := mw.CreateFormFile("file", filepath.Base(file))
if err != nil {
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return err
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}
_, err = io.Copy(part, f)
if err != nil {
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return err
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}
err = mw.Close()
if err != nil {
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return err
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}
req, err = http.NewRequest(method, u.String(), &buf)
if err != nil {
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return err
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}
ct = mw.FormDataContentType()
} else {
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if method == http.MethodGet && pg != nil {
u.RawQuery = pg.toValues().Encode()
}
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req, err = http.NewRequest(method, u.String(), nil)
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if err != nil {
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return err
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}
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}
req = req.WithContext(ctx)
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req.Header.Set("Authorization", "Bearer "+c.config.AccessToken)
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if params != nil {
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req.Header.Set("Content-Type", ct)
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}
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resp, err := c.Do(req)
if err != nil {
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return err
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}
defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return parseAPIError("bad request", resp)
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} else if res == nil {
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return nil
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} else if pg != nil {
if lh := resp.Header.Get("Link"); lh != "" {
pg2, err := newPagination(lh)
if err != nil {
return err
}
*pg = *pg2
}
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}
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return json.NewDecoder(resp.Body).Decode(&res)
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}
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// NewClient return new mastodon API client.
func NewClient(config *Config) *Client {
return &Client{
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Client: *http.DefaultClient,
config: config,
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}
}
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// Authenticate get access-token to the API.
func (c *Client) Authenticate(ctx context.Context, username, password string) error {
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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)
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params.Set("scope", "read write follow")
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u, err := url.Parse(c.config.Server)
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if err != nil {
return err
}
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u.Path = path.Join(u.Path, "/oauth/token")
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req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(params.Encode()))
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if err != nil {
return err
}
req = req.WithContext(ctx)
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
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return parseAPIError("bad authorization", resp)
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}
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res := struct {
AccessToken string `json:"access_token"`
}{}
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err = json.NewDecoder(resp.Body).Decode(&res)
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if err != nil {
return err
}
c.config.AccessToken = res.AccessToken
return nil
}
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// Toot is struct to post status.
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type Toot struct {
Status string `json:"status"`
InReplyToID int64 `json:"in_reply_to_id"`
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MediaIDs []int64 `json:"media_ids"`
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Sensitive bool `json:"sensitive"`
SpoilerText string `json:"spoiler_text"`
Visibility string `json:"visibility"`
}
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// 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"`
}
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// Results hold information for search result.
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type Results struct {
Accounts []*Account `json:"accounts"`
Statuses []*Status `json:"statuses"`
Hashtags []string `json:"hashtags"`
}
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// Pagination is a struct for specifying the get range.
type Pagination struct {
MaxID *int64
SinceID *int64
Limit *int64
}
func newPagination(rawlink string) (*Pagination, error) {
if rawlink == "" {
return nil, errors.New("empty link header")
}
p := &Pagination{}
for _, link := range linkheader.Parse(rawlink) {
switch link.Rel {
case "next":
maxID, err := getPaginationID(link.URL, "max_id")
if err != nil {
return nil, err
}
p.MaxID = &maxID
case "prev":
sinceID, err := getPaginationID(link.URL, "since_id")
if err != nil {
return nil, err
}
p.SinceID = &sinceID
}
}
return p, nil
}
func getPaginationID(rawurl, key string) (int64, error) {
u, err := url.Parse(rawurl)
if err != nil {
return 0, err
}
id, err := strconv.ParseInt(u.Query().Get(key), 10, 64)
if err != nil {
return 0, err
}
return id, nil
}
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func (p *Pagination) toValues() url.Values {
return p.setValues(url.Values{})
}
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func (p *Pagination) setValues(params url.Values) url.Values {
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if p.MaxID != nil {
params.Set("max_id", fmt.Sprint(*p.MaxID))
}
if p.SinceID != nil {
params.Set("since_id", fmt.Sprint(*p.SinceID))
}
if p.Limit != nil {
params.Set("limit", fmt.Sprint(*p.Limit))
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}
return params
}