134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
package api
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import (
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"fmt"
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"io"
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"log"
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"mime/multipart"
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"net/http"
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"net/textproto"
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"strconv"
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"strings"
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"github.com/diamondburned/arikawa/discord"
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"github.com/diamondburned/arikawa/internal/json"
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"github.com/pkg/errors"
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)
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var quoteEscaper = strings.NewReplacer(`\`, `\\`, `"`, `\"`)
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type SendMessageFile struct {
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Name string
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ContentType string // auto-detect if empty
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Reader io.Reader
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}
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type SendMessageData struct {
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Content string `json:"content,omitempty"`
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Nonce string `json:"nonce,omitempty"`
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TTS bool `json:"tts"`
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Embed *discord.Embed `json:"embed,omitempty"`
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Files []SendMessageFile `json:"-"`
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}
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func (data *SendMessageData) WriteMultipart(
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c json.Driver, w io.Writer) error {
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return writeMultipart(c, w, data, data.Files)
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}
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type ExecuteWebhookData struct {
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SendMessageData
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Username string `json:"username,omitempty"`
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AvatarURL discord.URL `json:"avatar_url,omitempty"`
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}
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func (data *ExecuteWebhookData) WriteMultipart(
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c json.Driver, w io.Writer) error {
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return writeMultipart(c, w, data, data.Files)
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}
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func writeMultipart(
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c json.Driver, w io.Writer,
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item interface{}, files []SendMessageFile) error {
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body := multipart.NewWriter(w)
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// Encode the JSON body first
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h := textproto.MIMEHeader{}
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h.Set("Content-Disposition", `form-data; name="payload_json"`)
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h.Set("Content-Type", "application/json")
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w, err := body.CreatePart(h)
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if err != nil {
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return errors.Wrap(err, "Failed to create bodypart for JSON")
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}
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j, err := c.Marshal(item)
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log.Println(string(j), err)
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if err := c.EncodeStream(w, item); err != nil {
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return errors.Wrap(err, "Failed to encode JSON")
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}
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// Content-Type buffer
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var buf []byte
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for i, file := range files {
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h := textproto.MIMEHeader{}
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h.Set("Content-Disposition", fmt.Sprintf(
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`form-data; name="file%d"; filename="%s"`,
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i, quoteEscaper.Replace(file.Name),
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))
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var bufUsed int
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if file.ContentType == "" {
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if buf == nil {
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buf = make([]byte, 512)
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}
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n, err := file.Reader.Read(buf)
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if err != nil {
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return errors.Wrap(err, "Failed to read first 512 bytes for "+
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strconv.Itoa(i))
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}
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file.ContentType = http.DetectContentType(buf[:n])
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files[i] = file
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bufUsed = n
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}
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h.Set("Content-Type", file.ContentType)
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w, err := body.CreatePart(h)
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if err != nil {
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return errors.Wrap(err, "Failed to create bodypart for "+
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strconv.Itoa(i))
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}
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if bufUsed > 0 {
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// Prematurely write
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if _, err := w.Write(buf[:bufUsed]); err != nil {
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return errors.Wrap(err, "Failed to write buffer for "+
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strconv.Itoa(i))
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}
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}
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if _, err := io.Copy(w, file.Reader); err != nil {
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return errors.Wrap(err, "Failed to write file for "+
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strconv.Itoa(i))
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}
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}
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if err := body.Close(); err != nil {
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return errors.Wrap(err, "Failed to close body writer")
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}
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return nil
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}
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