add UploadMedia

mastodon.go

@@ -1,12 +1,17 @@
 package mastodon
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
+	"mime/multipart"
 	"net/http"
 	"net/url"
+	"os"
 	"path"
+	"path/filepath"
 	"strings"
 )
 
@@ -24,21 +29,53 @@ type Client struct {
 	config *Config
 }
 
-func (c *Client) doAPI(ctx context.Context, method string, uri string, params url.Values, res interface{}) error {
+func (c *Client) doAPI(ctx context.Context, method string, uri string, params interface{}, res interface{}) error {
 	u, err := url.Parse(c.config.Server)
 	if err != nil {
 		return err
 	}
 	u.Path = path.Join(u.Path, uri)
 
-	req, err := http.NewRequest(method, u.String(), strings.NewReader(params.Encode()))
+	var req *http.Request
+	ct := "application/x-www-form-urlencoded"
+	if values, ok := params.(url.Values); ok {
+		req, err = http.NewRequest(method, u.String(), strings.NewReader(values.Encode()))
 		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)
+	}
 	req.WithContext(ctx)
 	req.Header.Set("Authorization", "Bearer "+c.config.AccessToken)
 	if params != nil {
-		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		req.Header.Set("Content-Type", ct)
 	}
 
 	resp, err := c.Do(req)

status.go

@@ -201,3 +201,13 @@ func (c *Client) Search(ctx context.Context, q string, resolve bool) (*Results,
 	}
 	return &results, nil
 }
+
+// PostMedia upload a media attachment.
+func (c *Client) UploadMedia(ctx context.Context, file string) (*Attachment, error) {
+	var attachment Attachment
+	err := c.doAPI(ctx, http.MethodPost, "/api/v1/media", file, &attachment)
+	if err != nil {
+		return nil, err
+	}
+	return &attachment, nil
+}

status_test.go

@@ -257,3 +257,33 @@ func TestUnfavourite(t *testing.T) {
 		t.Fatalf("want %q but %q", "zzz", status.Content)
 	}
 }
+
+func TestUploadMedia(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/v1/media" {
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			return
+		}
+		if r.Method != "POST" {
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			return
+		}
+		fmt.Fprintln(w, `{"ID": 123}`)
+		return
+	}))
+	defer ts.Close()
+
+	client := NewClient(&Config{
+		Server:       ts.URL,
+		ClientID:     "foo",
+		ClientSecret: "bar",
+		AccessToken:  "zoo",
+	})
+	attachment, err := client.UploadMedia(context.Background(), "testdata/logo.png")
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+	if attachment.ID != 123 {
+		t.Fatalf("want %q but %q", 123, attachment.ID)
+	}
+}