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r
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285
service/service.go
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285
service/service.go
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package service
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"path"
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"strings"
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"mastodon"
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"web/model"
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"web/renderer"
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"web/util"
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)
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var (
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ErrInvalidArgument = errors.New("invalid argument")
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ErrInvalidToken = errors.New("invalid token")
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ErrInvalidClient = errors.New("invalid client")
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)
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type Service interface {
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ServeHomePage(ctx context.Context, client io.Writer) (err error)
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GetAuthUrl(ctx context.Context, instance string) (url string, sessionID string, err error)
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GetUserToken(ctx context.Context, sessionID string, c *mastodon.Client, token string) (accessToken string, err error)
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ServeErrorPage(ctx context.Context, client io.Writer, err error)
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ServeSigninPage(ctx context.Context, client io.Writer) (err error)
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ServeTimelinePage(ctx context.Context, client io.Writer, c *mastodon.Client, maxID string, sinceID string, minID string) (err error)
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ServeThreadPage(ctx context.Context, client io.Writer, c *mastodon.Client, id string, reply bool) (err error)
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Like(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error)
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UnLike(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error)
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Retweet(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error)
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UnRetweet(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error)
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PostTweet(ctx context.Context, client io.Writer, c *mastodon.Client, content string, replyToID string) (err error)
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}
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type service struct {
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clientName string
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clientScope string
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clientWebsite string
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renderer renderer.Renderer
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sessionRepo model.SessionRepository
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appRepo model.AppRepository
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}
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func NewService(clientName string, clientScope string, clientWebsite string,
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renderer renderer.Renderer, sessionRepo model.SessionRepository,
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appRepo model.AppRepository) Service {
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return &service{
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clientName: clientName,
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clientScope: clientScope,
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clientWebsite: clientWebsite,
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renderer: renderer,
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sessionRepo: sessionRepo,
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appRepo: appRepo,
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}
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}
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func (svc *service) GetAuthUrl(ctx context.Context, instance string) (
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redirectUrl string, sessionID string, err error) {
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if !strings.HasPrefix(instance, "https://") {
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instance = "https://" + instance
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}
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sessionID = util.NewSessionId()
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err = svc.sessionRepo.Add(model.Session{
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ID: sessionID,
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InstanceURL: instance,
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})
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if err != nil {
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return
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}
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app, err := svc.appRepo.Get(instance)
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if err != nil {
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if err != model.ErrAppNotFound {
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return
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}
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var mastoApp *mastodon.Application
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mastoApp, err = mastodon.RegisterApp(ctx, &mastodon.AppConfig{
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Server: instance,
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ClientName: svc.clientName,
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Scopes: svc.clientScope,
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Website: svc.clientWebsite,
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RedirectURIs: svc.clientWebsite + "/oauth_callback",
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})
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if err != nil {
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return
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}
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app = model.App{
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InstanceURL: instance,
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ClientID: mastoApp.ClientID,
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ClientSecret: mastoApp.ClientSecret,
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}
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err = svc.appRepo.Add(app)
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if err != nil {
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return
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}
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}
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u, err := url.Parse(path.Join(instance, "/oauth/authorize"))
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if err != nil {
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return
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}
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q := make(url.Values)
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q.Set("scope", "read write follow")
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q.Set("client_id", app.ClientID)
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q.Set("response_type", "code")
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q.Set("redirect_uri", svc.clientWebsite+"/oauth_callback")
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u.RawQuery = q.Encode()
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redirectUrl = u.String()
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return
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}
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func (svc *service) GetUserToken(ctx context.Context, sessionID string, c *mastodon.Client,
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code string) (token string, err error) {
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if len(code) < 1 {
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err = ErrInvalidArgument
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return
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}
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session, err := svc.sessionRepo.Get(sessionID)
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if err != nil {
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return
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}
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app, err := svc.appRepo.Get(session.InstanceURL)
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if err != nil {
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return
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}
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data := &bytes.Buffer{}
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err = json.NewEncoder(data).Encode(map[string]string{
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"client_id": app.ClientID,
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"client_secret": app.ClientSecret,
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"grant_type": "authorization_code",
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"code": code,
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"redirect_uri": svc.clientWebsite + "/oauth_callback",
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})
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if err != nil {
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return
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}
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resp, err := http.Post(app.InstanceURL+"/oauth/token", "application/json", data)
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if err != nil {
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return
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}
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defer resp.Body.Close()
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var res struct {
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AccessToken string `json:"access_token"`
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}
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err = json.NewDecoder(resp.Body).Decode(&res)
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if err != nil {
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return
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}
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/*
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err = c.AuthenticateToken(ctx, code, svc.clientWebsite+"/oauth_callback")
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if err != nil {
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return
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}
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err = svc.sessionRepo.Update(sessionID, c.GetAccessToken(ctx))
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*/
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return res.AccessToken, nil
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}
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func (svc *service) ServeHomePage(ctx context.Context, client io.Writer) (err error) {
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err = svc.renderer.RenderHomePage(ctx, client)
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if err != nil {
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return
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}
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return
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}
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func (svc *service) ServeErrorPage(ctx context.Context, client io.Writer, err error) {
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svc.renderer.RenderErrorPage(ctx, client, err)
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}
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func (svc *service) ServeSigninPage(ctx context.Context, client io.Writer) (err error) {
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err = svc.renderer.RenderSigninPage(ctx, client)
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if err != nil {
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return
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}
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return
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}
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func (svc *service) ServeTimelinePage(ctx context.Context, client io.Writer,
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c *mastodon.Client, maxID string, sinceID string, minID string) (err error) {
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var hasNext, hasPrev bool
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var nextLink, prevLink string
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var pg = mastodon.Pagination{
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MaxID: maxID,
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SinceID: sinceID,
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MinID: minID,
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Limit: 20,
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}
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statuses, err := c.GetTimelineHome(ctx, &pg)
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if err != nil {
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return err
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}
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if len(pg.MaxID) > 0 {
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hasNext = true
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nextLink = fmt.Sprintf("/timeline?max_id=%s", pg.MaxID)
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}
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if len(pg.SinceID) > 0 {
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hasPrev = true
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prevLink = fmt.Sprintf("/timeline?since_id=%s", pg.SinceID)
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}
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data := renderer.NewTimelinePageTemplateData(statuses, hasNext, nextLink, hasPrev, prevLink)
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err = svc.renderer.RenderTimelinePage(ctx, client, data)
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if err != nil {
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return
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}
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return
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}
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func (svc *service) ServeThreadPage(ctx context.Context, client io.Writer, c *mastodon.Client, id string, reply bool) (err error) {
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status, err := c.GetStatus(ctx, id)
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if err != nil {
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return
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}
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context, err := c.GetStatusContext(ctx, id)
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if err != nil {
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return
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}
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data := renderer.NewThreadPageTemplateData(status, context, reply, id)
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err = svc.renderer.RenderThreadPage(ctx, client, data)
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if err != nil {
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return
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}
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return
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}
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func (svc *service) Like(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error) {
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_, err = c.Favourite(ctx, id)
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return
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}
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func (svc *service) UnLike(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error) {
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_, err = c.Unfavourite(ctx, id)
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return
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}
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func (svc *service) Retweet(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error) {
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_, err = c.Reblog(ctx, id)
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return
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}
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func (svc *service) UnRetweet(ctx context.Context, client io.Writer, c *mastodon.Client, id string) (err error) {
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_, err = c.Unreblog(ctx, id)
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return
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}
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func (svc *service) PostTweet(ctx context.Context, client io.Writer, c *mastodon.Client, content string, replyToID string) (err error) {
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tweet := &mastodon.Toot{
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Status: content,
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InReplyToID: replyToID,
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}
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_, err = c.PostStatus(ctx, tweet)
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return
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}
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