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block.go
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block.go
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package gohost
// Cohost posts are comprised of blocks, this file contains the
// structs that symbolize said blocks
import (
"bytes"
"encoding/json"
"fmt"
"image"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"io"
"mime"
"mime/multipart"
"net/http"
"net/textproto"
"os"
"strings"
"github.com/curtywill/gohost/requests"
)
type Markdown struct {
Content string
}
func (m Markdown) getBlock() blocksResponse {
// extracting content like this to suppress "should convert instead of using struct literal"
// i know its stupid go leave me alone bxtch
content := m.Content
return blocksResponse{
Type: "markdown",
Markdown: &markdownBlockResponse{content},
}
}
type Attachment struct {
Filepath string
AltText string
block attachmentBlockResponse
filename string
contentType string
contentLength int64
height int
width int
}
func (a Attachment) FileUrl() string {
return a.block.FileURL
}
func (a *Attachment) initAttachment() error {
file, err := os.Open(a.Filepath)
if err != nil {
return err
}
defer file.Close()
stat, err := os.Stat(a.Filepath)
if err != nil {
return err
}
filename := stat.Name()
a.filename = filename
sl := strings.Split(filename, ".")
a.contentType = mime.TypeByExtension("." + strings.ToLower(sl[len(sl)-1]))
a.contentLength = stat.Size()
img, _, err := image.DecodeConfig(file)
if err != nil {
return err
}
a.height = img.Height
a.width = img.Width
a.block = attachmentBlockResponse{
AltText: a.AltText,
}
return nil
}
func (a Attachment) getBlock() blocksResponse {
if a.block.AttachmentId == "" {
a.block.AttachmentId = "00000000-0000-0000-0000-000000000000"
}
return blocksResponse{
Type: "attachment",
Attachment: &a.block,
}
}
func (a *Attachment) upload(client *http.Client, postId int, project Project) error {
if a.block.AttachmentId != "" {
return nil
}
// fill Attachment struct before we start uploading
err := a.initAttachment()
if err != nil {
return err
}
form := makeForm(a.filename, a.contentType, a.contentLength, a.height, a.width)
formHeader := map[string]string{
"Content-Type": "application/json; charset=UTF-8",
}
r := attachStartResponse{}
data, _, err := requests.Fetch(client, "POST",
fmt.Sprintf("/project/%s/posts/%d/attach/start", project.Handle(), postId),
project.u.cookie, formHeader, bytes.NewReader(form), false)
if err != nil {
return err
}
json.Unmarshal(data, &r)
file, err := os.Open(a.Filepath)
if err != nil {
return err
}
defer file.Close()
contentTypeHeader, body, err := doSpacesForm(r.RequiredFields, a.filename, file)
if err != nil {
return err
}
req, err := http.NewRequest(http.MethodPost, r.Url, body)
if err != nil {
return err
}
req.Header.Set("Content-Type", contentTypeHeader)
res, err := client.Do(req)
if err != nil {
return err
}
if res.StatusCode != 204 {
return fmt.Errorf("error uploading attachment to digital ocean! status code: %d", res.StatusCode)
}
_, _, err = requests.Fetch(client, "POST",
fmt.Sprintf("/project/%s/posts/%d/attach/finish/%s", project.Handle(), postId, r.AttachmentId),
project.u.cookie, nil, nil, false)
if err != nil {
return err
}
// file's been attached, need to add attachment ID to attachment struct
a.block.AttachmentId = r.AttachmentId
return nil
}
// helper functions for Upload
// creates the form that starts the attachment process
func makeForm(filename, contentType string, contentLength int64, height, width int) []byte {
// literally a subset of Attachment because I didn't want to export the fields in the Attachment struct
type form struct {
Filename string `json:"filename"`
ContentType string `json:"content_type"`
ContentLength int64 `json:"content_length"`
Height int `json:"height"`
Width int `json:"width"`
}
f := form{filename, contentType, contentLength, height, width}
marshalledForm, _ := json.Marshal(f)
return marshalledForm
}
// creates the multipart form needed for the digital ocean spaces credentials
func doSpacesForm(r requiredFieldsResponse, filename string, file *os.File) (string, *bytes.Buffer, error) {
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
defer writer.Close() // writes closing boundary line
writer.WriteField("acl", r.Acl)
writer.WriteField("Content-Type", r.ContentType)
writer.WriteField("Content-Disposition", r.ContentDisposition)
writer.WriteField("Cache-Control", r.CacheControl)
writer.WriteField("key", r.Key)
writer.WriteField("bucket", r.Bucket)
writer.WriteField("X-Amz-Algorithm", r.XAmzAlgorithm)
writer.WriteField("X-Amz-Credential", r.XAmzCredential)
writer.WriteField("X-Amz-Date", r.XAmzDate)
writer.WriteField("Policy", r.Policy)
writer.WriteField("X-Amz-Signature", r.XAmzSignature)
h := make(textproto.MIMEHeader)
h.Set("Content-Disposition",
fmt.Sprintf(`form-data; name="file"; filename="%s"`, escapeQuotes(filename)))
h.Set("Content-Type", r.ContentType)
p, err := writer.CreatePart(h)
if err != nil {
return "", nil, err
}
_, err = io.Copy(p, file)
if err != nil {
return "", nil, err
}
return writer.FormDataContentType(), body, nil
}
// helpers for the multipart form
// taken from go source
var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
func escapeQuotes(s string) string {
return quoteEscaper.Replace(s)
}